From 9e64c9e273a17f718cbd1fbd1ff07eb6da002648 Mon Sep 17 00:00:00 2001 From: PhilippTheServer Date: Sat, 6 Dec 2025 15:25:05 +0100 Subject: [PATCH 01/51] restructure for scale --- src/app/requirements.txt | 4 ---- src/app/services/__init__.py | 0 src/app/{ => services}/functions/__init__.py | 0 src/app/{ => services}/models/__init__.py | 0 src/app/{ => services}/routers/__init__.py | 0 src/app/shared/__init__.py | 0 6 files changed, 4 deletions(-) delete mode 100644 src/app/requirements.txt create mode 100644 src/app/services/__init__.py rename src/app/{ => services}/functions/__init__.py (100%) rename src/app/{ => services}/models/__init__.py (100%) rename src/app/{ => services}/routers/__init__.py (100%) create mode 100644 src/app/shared/__init__.py diff --git a/src/app/requirements.txt b/src/app/requirements.txt deleted file mode 100644 index 6e9e09b..0000000 --- a/src/app/requirements.txt +++ /dev/null @@ -1,4 +0,0 @@ -fastapi -uvicorn[standard] -pydantic -typing_extensions diff --git a/src/app/services/__init__.py b/src/app/services/__init__.py new file mode 100644 index 0000000..e69de29 diff --git a/src/app/functions/__init__.py b/src/app/services/functions/__init__.py similarity index 100% rename from src/app/functions/__init__.py rename to src/app/services/functions/__init__.py diff --git a/src/app/models/__init__.py b/src/app/services/models/__init__.py similarity index 100% rename from src/app/models/__init__.py rename to src/app/services/models/__init__.py diff --git a/src/app/routers/__init__.py b/src/app/services/routers/__init__.py similarity index 100% rename from src/app/routers/__init__.py rename to src/app/services/routers/__init__.py diff --git a/src/app/shared/__init__.py b/src/app/shared/__init__.py new file mode 100644 index 0000000..e69de29 From fe909bb1216e17b7931cbd1e5084c383a13b58c1 Mon Sep 17 00:00:00 2001 From: PhilippTheServer Date: Sat, 6 Dec 2025 16:10:46 +0100 Subject: [PATCH 02/51] add ruff and pytest --- pyproject.toml | 2 ++ 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2001 From: PhilippTheServer Date: Sat, 6 Dec 2025 16:14:41 +0100 Subject: [PATCH 03/51] feat(logger): add core enums and interfaces - Add LogLevel and Environment enums - Define ILogFormatter, ILogFilter, ILogHandler protocols - Export public API in __init__.py --- src/app/shared/logger/__init__.py | 70 +++++++++++++++++++++++++++++ src/app/shared/logger/enums.py | 24 ++++++++++ src/app/shared/logger/interfaces.py | 41 +++++++++++++++++ 3 files changed, 135 insertions(+) create mode 100644 src/app/shared/logger/__init__.py create mode 100644 src/app/shared/logger/enums.py create mode 100644 src/app/shared/logger/interfaces.py diff --git a/src/app/shared/logger/__init__.py b/src/app/shared/logger/__init__.py new file mode 100644 index 0000000..5c2f356 --- /dev/null +++ b/src/app/shared/logger/__init__.py @@ -0,0 +1,70 @@ +""" +Advanced Logger Module for OpenTaberna. + +A production-ready logging system built following SOLID principles. + +Quick Start: + from app.shared.logger import get_logger, LogContext + + logger = get_logger(__name__) + logger.info("Application started", version="1.0.0") + + with LogContext(request_id="abc-123"): + logger.info("Processing request") + +Architecture: + - enums: Enumerations and constants + - interfaces: Abstract base classes (SOLID interfaces) + - formatters: Log formatting implementations + - filters: Log filtering and sanitization + - handlers: Output handlers (console, file, etc.) + - config: Configuration management + - context: Context management for request tracking + - logger: Main AppLogger class + - factory: Logger creation and caching +""" + +# Main API +from .factory import get_logger, clear_loggers +from .logger import AppLogger +from .context import LogContext, setup_request_logging +from .config import LoggerConfig + +# Enums +from .enums import LogLevel, Environment + +# Interfaces (for custom implementations) +from .interfaces import ILogFormatter, ILogFilter, ILogHandler + +# Implementations +from .formatters import JSONFormatter, ConsoleFormatter +from .filters import SensitiveDataFilter, LevelFilter +from .handlers import ConsoleHandler, FileHandler, DailyRotatingFileHandler + + +__all__ = [ + # Main API + "get_logger", + "clear_loggers", + "AppLogger", + "LogContext", + "LoggerConfig", + "setup_request_logging", + # Enums + "LogLevel", + "Environment", + # Interfaces (for custom implementations) + "ILogFormatter", + "ILogFilter", + "ILogHandler", + # Implementations + "JSONFormatter", + "ConsoleFormatter", + "SensitiveDataFilter", + "LevelFilter", + "ConsoleHandler", + "FileHandler", + "DailyRotatingFileHandler", +] + +__version__ = "1.0.0" diff --git a/src/app/shared/logger/enums.py b/src/app/shared/logger/enums.py new file mode 100644 index 0000000..126f913 --- /dev/null +++ b/src/app/shared/logger/enums.py @@ -0,0 +1,24 @@ +""" +Enumerations and constants for the logging system. +""" + +from enum import Enum + + +class LogLevel(str, Enum): + """Supported log levels.""" + + DEBUG = "DEBUG" + INFO = "INFO" + WARNING = "WARNING" + ERROR = "ERROR" + CRITICAL = "CRITICAL" + + +class Environment(str, Enum): + """Deployment environments.""" + + DEVELOPMENT = "development" + STAGING = "staging" + PRODUCTION = "production" + TESTING = "testing" diff --git a/src/app/shared/logger/interfaces.py b/src/app/shared/logger/interfaces.py new file mode 100644 index 0000000..885b843 --- /dev/null +++ b/src/app/shared/logger/interfaces.py @@ -0,0 +1,41 @@ +""" +Interfaces (Abstract Base Classes) for the logging system. + +Following Interface Segregation Principle - focused, minimal interfaces. +""" + +from abc import ABC, abstractmethod +from typing import Any, Dict +import logging + + +class ILogFormatter(ABC): + """Interface for log formatters.""" + + @abstractmethod + def format(self, record: logging.LogRecord) -> str: + """Format a log record into a string.""" + pass + + +class ILogFilter(ABC): + """Interface for log filters.""" + + @abstractmethod + def filter(self, record: logging.LogRecord) -> bool: + """Determine if a record should be logged.""" + pass + + @abstractmethod + def sanitize(self, data: Dict[str, Any]) -> Dict[str, Any]: + """Remove sensitive information from log data.""" + pass + + +class ILogHandler(ABC): + """Interface for log handlers.""" + + @abstractmethod + def setup(self, logger: logging.Logger, formatter: ILogFormatter) -> None: + """Configure and attach handler to logger.""" + pass From bc971a1007f8d0f0605e85b857042e260b6296ce Mon Sep 17 00:00:00 2001 From: PhilippTheServer Date: Sat, 6 Dec 2025 16:14:51 +0100 Subject: [PATCH 04/51] feat(logger): add JSON and Console formatters - JSONFormatter for structured logging - ConsoleFormatter with color support - Both implement ILogFormatter interface --- src/app/shared/logger/formatters.py | 124 ++++++++++++++++++++++++++++ 1 file changed, 124 insertions(+) create mode 100644 src/app/shared/logger/formatters.py diff --git a/src/app/shared/logger/formatters.py b/src/app/shared/logger/formatters.py new file mode 100644 index 0000000..2cb8af5 --- /dev/null +++ b/src/app/shared/logger/formatters.py @@ -0,0 +1,124 @@ +""" +Log formatters following Open/Closed Principle. + +New formatters can be added by implementing ILogFormatter without modifying existing code. +""" + +import json +import sys +import traceback +from datetime import datetime +import logging + +from .interfaces import ILogFormatter +from .context import get_log_context + + +class JSONFormatter(ILogFormatter): + """Structured JSON formatter for production environments.""" + + def __init__(self, include_extra: bool = True): + self.include_extra = include_extra + + def format(self, record: logging.LogRecord) -> str: + """Format record as JSON string.""" + log_data = { + "timestamp": datetime.fromtimestamp(record.created).isoformat(), + "level": record.levelname, + "logger": record.name, + "message": record.getMessage(), + "module": record.module, + "function": record.funcName, + "line": record.lineno, + } + + # Add context data + context = get_log_context() + if context: + log_data["context"] = context + + # Add extra fields + if self.include_extra: + # List of reserved LogRecord attributes + reserved_attrs = { + "name", + "msg", + "args", + "created", + "filename", + "funcName", + "levelname", + "levelno", + "lineno", + "module", + "msecs", + "message", + "pathname", + "process", + "processName", + "relativeCreated", + "thread", + "threadName", + "exc_info", + "exc_text", + "stack_info", + "taskName", + } + + extra_fields = { + key: value + for key, value in record.__dict__.items() + if key not in reserved_attrs + } + if extra_fields: + log_data["extra"] = extra_fields + + # Add exception info if present + if record.exc_info: + log_data["exception"] = { + "type": record.exc_info[0].__name__, + "message": str(record.exc_info[1]), + "traceback": traceback.format_exception(*record.exc_info), + } + + return json.dumps(log_data, default=str) + + +class ConsoleFormatter(ILogFormatter): + """Human-readable formatter for development environments.""" + + COLORS = { + "DEBUG": "\033[36m", # Cyan + "INFO": "\033[32m", # Green + "WARNING": "\033[33m", # Yellow + "ERROR": "\033[31m", # Red + "CRITICAL": "\033[35m", # Magenta + "RESET": "\033[0m", + } + + def __init__(self, use_colors: bool = True): + self.use_colors = use_colors and sys.stderr.isatty() + + def format(self, record: logging.LogRecord) -> str: + """Format record for console output.""" + timestamp = datetime.fromtimestamp(record.created).strftime("%Y-%m-%d %H:%M:%S") + level = record.levelname + + if self.use_colors: + color = self.COLORS.get(level, "") + reset = self.COLORS["RESET"] + level = f"{color}{level}{reset}" + + base_msg = f"[{timestamp}] {level:<8} {record.name}: {record.getMessage()}" + + # Add context if present + context = get_log_context() + if context: + context_str = " ".join(f"{k}={v}" for k, v in context.items()) + base_msg += f" | {context_str}" + + # Add exception if present + if record.exc_info: + base_msg += f"\n{''.join(traceback.format_exception(*record.exc_info))}" + + return base_msg From f46ce69da23e6570e747363fe5d0f2848897fc58 Mon Sep 17 00:00:00 2001 From: PhilippTheServer Date: Sat, 6 Dec 2025 16:15:06 +0100 Subject: [PATCH 05/51] feat(logger): add log filters - SensitiveDataFilter for password/token redaction - LevelFilter for log level filtering - Both implement ILogFilter interface --- src/app/shared/logger/filters.py | 90 ++++++++++++++++++++++++++++++++ 1 file changed, 90 insertions(+) create mode 100644 src/app/shared/logger/filters.py diff --git a/src/app/shared/logger/filters.py b/src/app/shared/logger/filters.py new file mode 100644 index 0000000..5a2c611 --- /dev/null +++ b/src/app/shared/logger/filters.py @@ -0,0 +1,90 @@ +""" +Log filters following Single Responsibility Principle. + +Each filter has one specific responsibility. +""" + +import logging +from typing import Any, Dict, Set + +from .interfaces import ILogFilter +from .enums import LogLevel + + +class SensitiveDataFilter(ILogFilter): + """Filter to remove sensitive information from logs.""" + + # Common patterns for sensitive data + SENSITIVE_KEYS: Set[str] = { + "password", + "passwd", + "pwd", + "secret", + "token", + "api_key", + "apikey", + "authorization", + "auth", + "credential", + "private_key", + "access_token", + "refresh_token", + "session_id", + "cookie", + "csrf_token", + "ssn", + "credit_card", + "cvv", + "pin", + } + + MASK_VALUE = "***REDACTED***" + + def filter(self, record: logging.LogRecord) -> bool: + """Always return True - we sanitize but don't block.""" + # Sanitize extra fields + for key in list(record.__dict__.keys()): + if self._is_sensitive_key(key): + setattr(record, key, self.MASK_VALUE) + return True + + def sanitize(self, data: Dict[str, Any]) -> Dict[str, Any]: + """Recursively remove sensitive data from dictionary.""" + if not isinstance(data, dict): + return data + + sanitized = {} + for key, value in data.items(): + if self._is_sensitive_key(key): + sanitized[key] = self.MASK_VALUE + elif isinstance(value, dict): + sanitized[key] = self.sanitize(value) + elif isinstance(value, (list, tuple)): + sanitized[key] = [ + self.sanitize(item) if isinstance(item, dict) else item + for item in value + ] + else: + sanitized[key] = value + + return sanitized + + def _is_sensitive_key(self, key: str) -> bool: + """Check if key name indicates sensitive data.""" + key_lower = key.lower() + return any(sensitive in key_lower for sensitive in self.SENSITIVE_KEYS) + + +class LevelFilter(ILogFilter): + """Filter logs by minimum level.""" + + def __init__(self, min_level: LogLevel): + self.min_level = getattr(logging, min_level.value) + + def filter(self, record: logging.LogRecord) -> bool: + """Filter by log level.""" + return record.levelno >= self.min_level + + def sanitize(self, data: Dict[str, Any]) -> Dict[str, Any]: + """No sanitization needed for level filter.""" + return data From 44a1606fe5b2656d23f86274b0f420f5f389a2ad Mon Sep 17 00:00:00 2001 From: PhilippTheServer Date: Sat, 6 Dec 2025 16:15:16 +0100 Subject: [PATCH 06/51] feat(logger): add log handlers - ConsoleHandler for stdout/stderr logging - FileHandler for file logging - DailyRotatingFileHandler with log rotation - All implement ILogHandler interface --- src/app/shared/logger/handlers.py | 94 +++++++++++++++++++++++++++++++ 1 file changed, 94 insertions(+) create mode 100644 src/app/shared/logger/handlers.py diff --git a/src/app/shared/logger/handlers.py b/src/app/shared/logger/handlers.py new file mode 100644 index 0000000..2936c18 --- /dev/null +++ b/src/app/shared/logger/handlers.py @@ -0,0 +1,94 @@ +""" +Log handlers following Liskov Substitution Principle. + +All handlers are interchangeable through the ILogHandler interface. +""" + +import logging +import sys +from logging.handlers import RotatingFileHandler, TimedRotatingFileHandler +from pathlib import Path + +from .interfaces import ILogFormatter, ILogHandler +from .enums import LogLevel + + +class _FormatterWrapper(logging.Formatter): + """Wrapper to use custom ILogFormatter with logging.Handler.""" + + def __init__(self, custom_formatter: ILogFormatter): + super().__init__() + self.custom_formatter = custom_formatter + + def format(self, record: logging.LogRecord) -> str: + return self.custom_formatter.format(record) + + +class ConsoleHandler(ILogHandler): + """Handler for console output.""" + + def __init__(self, level: LogLevel = LogLevel.INFO): + self.level = level + + def setup(self, logger: logging.Logger, formatter: ILogFormatter) -> None: + """Setup console handler.""" + handler = logging.StreamHandler(sys.stdout) + handler.setLevel(getattr(logging, self.level.value)) + handler.setFormatter(_FormatterWrapper(formatter)) + logger.addHandler(handler) + + +class FileHandler(ILogHandler): + """Handler for file output with rotation.""" + + def __init__( + self, + filepath: Path, + level: LogLevel = LogLevel.INFO, + max_bytes: int = 10 * 1024 * 1024, # 10MB + backup_count: int = 5, + ): + self.filepath = filepath + self.level = level + self.max_bytes = max_bytes + self.backup_count = backup_count + + def setup(self, logger: logging.Logger, formatter: ILogFormatter) -> None: + """Setup rotating file handler.""" + self.filepath.parent.mkdir(parents=True, exist_ok=True) + + handler = RotatingFileHandler( + filename=str(self.filepath), + maxBytes=self.max_bytes, + backupCount=self.backup_count, + encoding="utf-8", + ) + handler.setLevel(getattr(logging, self.level.value)) + handler.setFormatter(_FormatterWrapper(formatter)) + logger.addHandler(handler) + + +class DailyRotatingFileHandler(ILogHandler): + """Handler for daily rotating file output.""" + + def __init__( + self, filepath: Path, level: LogLevel = LogLevel.INFO, backup_count: int = 30 + ): + self.filepath = filepath + self.level = level + self.backup_count = backup_count + + def setup(self, logger: logging.Logger, formatter: ILogFormatter) -> None: + """Setup daily rotating file handler.""" + self.filepath.parent.mkdir(parents=True, exist_ok=True) + + handler = TimedRotatingFileHandler( + filename=str(self.filepath), + when="midnight", + interval=1, + backupCount=self.backup_count, + encoding="utf-8", + ) + handler.setLevel(getattr(logging, self.level.value)) + handler.setFormatter(_FormatterWrapper(formatter)) + logger.addHandler(handler) From 7aeb435a4975d47f0e67c88328e2a5f30cdb43fc Mon Sep 17 00:00:00 2001 From: PhilippTheServer Date: Sat, 6 Dec 2025 16:15:27 +0100 Subject: [PATCH 07/51] feat(logger): add configuration system - LoggerConfig with environment presets - Presets for development, testing, staging, production - Configurable formatters, handlers, and filters --- src/app/shared/logger/config.py | 117 ++++++++++++++++++++++++++++++++ 1 file changed, 117 insertions(+) create mode 100644 src/app/shared/logger/config.py diff --git a/src/app/shared/logger/config.py b/src/app/shared/logger/config.py new file mode 100644 index 0000000..33bd535 --- /dev/null +++ b/src/app/shared/logger/config.py @@ -0,0 +1,117 @@ +""" +Logger configuration following Dependency Inversion Principle. + +Configuration depends on abstractions (interfaces), not concrete implementations. +""" + +from pathlib import Path +from typing import List, Optional + +from .enums import Environment, LogLevel +from .interfaces import ILogFilter, ILogHandler +from .filters import SensitiveDataFilter +from .handlers import ConsoleHandler, DailyRotatingFileHandler, FileHandler + + +class LoggerConfig: + """Configuration for logger setup.""" + + def __init__( + self, + name: str, + level: LogLevel = LogLevel.INFO, + handlers: Optional[List[ILogHandler]] = None, + filters: Optional[List[ILogFilter]] = None, + environment: Environment = Environment.DEVELOPMENT, + ): + self.name = name + self.level = level + self.handlers = handlers or [] + self.filters = filters or [SensitiveDataFilter()] + self.environment = environment + + @classmethod + def from_environment( + cls, name: str, env: Environment, log_dir: Optional[Path] = None + ) -> "LoggerConfig": + """Create configuration based on environment.""" + if env == Environment.DEVELOPMENT: + return cls._development_config(name) + elif env == Environment.TESTING: + return cls._testing_config(name) + elif env == Environment.STAGING: + return cls._staging_config(name, log_dir) + else: # PRODUCTION + return cls._production_config(name, log_dir) + + @classmethod + def _development_config(cls, name: str) -> "LoggerConfig": + """Development environment configuration.""" + return cls( + name=name, + level=LogLevel.DEBUG, + handlers=[ConsoleHandler(LogLevel.DEBUG)], + filters=[SensitiveDataFilter()], + environment=Environment.DEVELOPMENT, + ) + + @classmethod + def _testing_config(cls, name: str) -> "LoggerConfig": + """Testing environment configuration.""" + return cls( + name=name, + level=LogLevel.WARNING, + handlers=[ConsoleHandler(LogLevel.WARNING)], + filters=[SensitiveDataFilter()], + environment=Environment.TESTING, + ) + + @classmethod + def _staging_config(cls, name: str, log_dir: Optional[Path]) -> "LoggerConfig": + """Staging environment configuration.""" + log_dir = log_dir or Path("/var/log/opentaberna") + + return cls( + name=name, + level=LogLevel.INFO, + handlers=[ + ConsoleHandler(LogLevel.INFO), + FileHandler( + filepath=log_dir / "app.log", + level=LogLevel.INFO, + max_bytes=50 * 1024 * 1024, # 50MB + backup_count=5, + ), + FileHandler( + filepath=log_dir / "error.log", + level=LogLevel.ERROR, + max_bytes=50 * 1024 * 1024, + backup_count=5, + ), + ], + filters=[SensitiveDataFilter()], + environment=Environment.STAGING, + ) + + @classmethod + def _production_config(cls, name: str, log_dir: Optional[Path]) -> "LoggerConfig": + """Production environment configuration.""" + log_dir = log_dir or Path("/var/log/opentaberna") + + return cls( + name=name, + level=LogLevel.INFO, + handlers=[ + ConsoleHandler(LogLevel.WARNING), + DailyRotatingFileHandler( + filepath=log_dir / "app.log", level=LogLevel.INFO, backup_count=30 + ), + DailyRotatingFileHandler( + filepath=log_dir / "error.log", + level=LogLevel.ERROR, + backup_count=90, + ), + ], + filters=[SensitiveDataFilter()], + environment=Environment.PRODUCTION, + ) From f47947e0a15a417e0867f15ef8610968b3523266 Mon Sep 17 00:00:00 2001 From: PhilippTheServer Date: Sat, 6 Dec 2025 16:15:37 +0100 Subject: [PATCH 08/51] feat(logger): add context management - LogContext for request-scoped metadata - Context manager for automatic cleanup - Thread-safe using contextvars --- src/app/shared/logger/context.py | 61 ++++++++++++++++++++++++++++++++ 1 file changed, 61 insertions(+) create mode 100644 src/app/shared/logger/context.py diff --git a/src/app/shared/logger/context.py b/src/app/shared/logger/context.py new file mode 100644 index 0000000..f8c740d --- /dev/null +++ b/src/app/shared/logger/context.py @@ -0,0 +1,61 @@ +""" +Context management for request-scoped logging data. + +Uses contextvars for thread-safe and async-safe context storage. +""" + +from contextvars import ContextVar +from typing import Any, Dict, Optional + + +# Context storage for request-scoped data +_log_context: ContextVar[Dict[str, Any]] = ContextVar("log_context", default={}) + + +class LogContext: + """ + Context manager for adding contextual information to logs. + + Usage: + with LogContext(request_id="abc-123", user_id="456"): + logger.info("Processing request") + # Log will include request_id and user_id + """ + + def __init__(self, **context): + self.context = context + self.token: Optional[Any] = None + + def __enter__(self): + """Add context to ContextVar.""" + current = _log_context.get() + updated = {**current, **self.context} + self.token = _log_context.set(updated) + return self + + def __exit__(self, exc_type, exc_val, exc_tb): + """Remove context from ContextVar.""" + if self.token: + _log_context.reset(self.token) + + +def get_log_context() -> Dict[str, Any]: + """Get current log context.""" + return _log_context.get() + + +def setup_request_logging(request_id: str, **context): + """ + Setup logging context for a request. + + Convenience function for FastAPI middleware. + + Usage: + @app.middleware("http") + async def log_requests(request: Request, call_next): + request_id = str(uuid.uuid4()) + with setup_request_logging(request_id, path=request.url.path): + response = await call_next(request) + return response + """ + return LogContext(request_id=request_id, **context) From 8faabce330eb83ee1716dd375ceb02f1c7f3d34a Mon Sep 17 00:00:00 2001 From: PhilippTheServer Date: Sat, 6 Dec 2025 16:15:47 +0100 Subject: [PATCH 09/51] feat(logger): add AppLogger class - Main logger orchestration class - Integrates formatters, handlers, and filters - Filters reserved LogRecord attributes - Performance measurement with measure_time() --- src/app/shared/logger/logger.py | 164 ++++++++++++++++++++++++++++++++ 1 file changed, 164 insertions(+) create mode 100644 src/app/shared/logger/logger.py diff --git a/src/app/shared/logger/logger.py b/src/app/shared/logger/logger.py new file mode 100644 index 0000000..b2326e7 --- /dev/null +++ b/src/app/shared/logger/logger.py @@ -0,0 +1,164 @@ +""" +Main AppLogger class orchestrating all components. + +This class follows SOLID principles by depending on interfaces, +not concrete implementations. +""" + +import logging +import time +from contextlib import contextmanager + +from .config import LoggerConfig +from .enums import Environment, LogLevel +from .filters import SensitiveDataFilter +from .formatters import ConsoleFormatter, JSONFormatter +from .interfaces import ILogFilter + + +class AppLogger: + """ + Main logger class following SOLID principles. + + This class orchestrates formatters, handlers, and filters without + tight coupling to specific implementations. + """ + + def __init__(self, config: LoggerConfig): + self.config = config + self._logger = self._setup_logger() + self._sensitive_filter = next( + (f for f in config.filters if isinstance(f, SensitiveDataFilter)), + SensitiveDataFilter(), + ) + + def _setup_logger(self) -> logging.Logger: + """Initialize and configure the logger.""" + logger = logging.getLogger(self.config.name) + logger.setLevel(getattr(logging, self.config.level.value)) + logger.propagate = False + + # Clear existing handlers + logger.handlers.clear() + + # Determine formatter based on environment + if self.config.environment == Environment.DEVELOPMENT: + formatter = ConsoleFormatter(use_colors=True) + else: + formatter = JSONFormatter(include_extra=True) + + # Setup all handlers + for handler in self.config.handlers: + handler.setup(logger, formatter) + + # Add filters + for log_filter in self.config.filters: + if hasattr(log_filter, "filter"): + logger.addFilter(_FilterWrapper(log_filter)) + + return logger + + def debug(self, message: str, **kwargs): + """Log debug message.""" + self._log(LogLevel.DEBUG, message, **kwargs) + + def info(self, message: str, **kwargs): + """Log info message.""" + self._log(LogLevel.INFO, message, **kwargs) + + def warning(self, message: str, **kwargs): + """Log warning message.""" + self._log(LogLevel.WARNING, message, **kwargs) + + def error(self, message: str, exc_info: bool = False, **kwargs): + """Log error message.""" + self._log(LogLevel.ERROR, message, exc_info=exc_info, **kwargs) + + def critical(self, message: str, exc_info: bool = True, **kwargs): + """Log critical message.""" + self._log(LogLevel.CRITICAL, message, exc_info=exc_info, **kwargs) + + def exception(self, message: str, **kwargs): + """Log exception with traceback.""" + self._log(LogLevel.ERROR, message, exc_info=True, **kwargs) + + def _log(self, level: LogLevel, message: str, exc_info: bool = False, **kwargs): + """Internal logging method.""" + # Reserved LogRecord attributes that cannot be overridden + reserved_attrs = { + "name", + "msg", + "args", + "created", + "filename", + "funcName", + "levelname", + "levelno", + "lineno", + "module", + "msecs", + "message", + "pathname", + "process", + "processName", + "relativeCreated", + "thread", + "threadName", + "exc_info", + "exc_text", + "stack_info", + "taskName", + } + + # Sanitize kwargs + sanitized_kwargs = self._sensitive_filter.sanitize(kwargs) + + # Remove any reserved attributes from kwargs to avoid conflicts + safe_kwargs = { + k: v for k, v in sanitized_kwargs.items() if k not in reserved_attrs + } + + # Get log method + log_method = getattr(self._logger, level.value.lower()) + + # Log with extra fields + log_method(message, exc_info=exc_info, extra=safe_kwargs) + + @contextmanager + def measure_time(self, operation: str, **context): + """ + Context manager to measure execution time. + + Usage: + with logger.measure_time("database_query", query_type="SELECT"): + # ... operation + pass + """ + start_time = time.perf_counter() + self.debug(f"Starting {operation}", **context) + + try: + yield + except Exception: + duration = time.perf_counter() - start_time + self.error( + f"Failed {operation}", + duration_ms=duration * 1000, + exc_info=True, + **context, + ) + raise + else: + duration = time.perf_counter() - start_time + self.info(f"Completed {operation}", duration_ms=duration * 1000, **context) + + +class _FilterWrapper(logging.Filter): + """Wrapper to use custom ILogFilter with logging.Logger.""" + + def __init__(self, custom_filter: ILogFilter): + super().__init__() + self.custom_filter = custom_filter + + def filter(self, record: logging.LogRecord) -> bool: + return self.custom_filter.filter(record) From e99df6cf5f71f214bab552fe7fc3ac033b145554 Mon Sep 17 00:00:00 2001 From: PhilippTheServer Date: Sat, 6 Dec 2025 16:16:00 +0100 Subject: [PATCH 10/51] feat(logger): add factory pattern - get_logger() function with caching - clear_loggers() for cache management - Singleton pattern per logger name --- src/app/shared/logger/factory.py | 66 ++++++++++++++++++++++++++++++++ 1 file changed, 66 insertions(+) create mode 100644 src/app/shared/logger/factory.py diff --git a/src/app/shared/logger/factory.py b/src/app/shared/logger/factory.py new file mode 100644 index 0000000..86b246e --- /dev/null +++ b/src/app/shared/logger/factory.py @@ -0,0 +1,66 @@ +""" +Factory functions for creating logger instances. + +Provides convenient access to logger creation and management. +""" + +import os +from pathlib import Path +from typing import Dict, Optional + +from .config import LoggerConfig +from .enums import Environment +from .logger import AppLogger + + +# Global cache for logger instances +_loggers: Dict[str, AppLogger] = {} + + +def get_logger( + name: str, + config: Optional[LoggerConfig] = None, + environment: Optional[Environment] = None, + log_dir: Optional[Path] = None, +) -> AppLogger: + """ + Get or create a logger instance. + + Args: + name: Logger name (typically __name__) + config: Optional custom configuration + environment: Environment type (auto-detected if not provided) + log_dir: Directory for log files + + Returns: + Configured AppLogger instance + + Example: + logger = get_logger(__name__) + logger.info("Application started") + """ + if name in _loggers: + return _loggers[name] + + if config is None: + # Auto-detect environment from environment variable + env_str = os.getenv("ENVIRONMENT", "development").lower() + try: + env = Environment(env_str) + except ValueError: + env = Environment.DEVELOPMENT + + if environment: + env = environment + + config = LoggerConfig.from_environment(name, env, log_dir) + + logger = AppLogger(config) + _loggers[name] = logger + return logger + + +def clear_loggers(): + """Clear all cached logger instances. Useful for testing.""" + global _loggers + _loggers.clear() From 87e94fba9df284829b403bcdc65637560a8ac56e Mon Sep 17 00:00:00 2001 From: PhilippTheServer Date: Sat, 6 Dec 2025 16:16:21 +0100 Subject: [PATCH 11/51] test: add pytest configuration - Add conftest.py to configure Python path - Enable clean imports in tests --- conftest.py | 12 ++++++++++++ 1 file changed, 12 insertions(+) create mode 100644 conftest.py diff --git a/conftest.py b/conftest.py new file mode 100644 index 0000000..3ea1205 --- /dev/null +++ b/conftest.py @@ -0,0 +1,12 @@ +""" +Pytest configuration for the fastapi_opentaberna project. + +This file configures pytest to properly find and import modules. +""" + +import sys +from pathlib import Path + +# Add src directory to Python path +src_path = Path(__file__).parent / "src" +sys.path.insert(0, str(src_path)) From fbc70b0401194978136d362747b80e0ae9f0ffbe Mon Sep 17 00:00:00 2001 From: PhilippTheServer Date: Sat, 6 Dec 2025 16:16:31 +0100 Subject: [PATCH 12/51] test(logger): add comprehensive test suite - 12 tests covering all logger functionality - Test basic logging, context, filtering, performance - Test environment configs and multiple loggers --- tests/test_logger_module.py | 194 ++++++++++++++++++++++++++++++++++++ 1 file changed, 194 insertions(+) create mode 100644 tests/test_logger_module.py diff --git a/tests/test_logger_module.py b/tests/test_logger_module.py new file mode 100644 index 0000000..a93b2cf --- /dev/null +++ b/tests/test_logger_module.py @@ -0,0 +1,194 @@ +""" +Test suite for logger module. + +Tests all logger functionality including basic logging, context management, +sensitive data filtering, performance measurement, and custom configuration. +""" + +import pytest +from app.shared.logger import ( + get_logger, + LogContext, + LogLevel, + Environment, + LoggerConfig, + ConsoleHandler, + clear_loggers, +) + + +@pytest.fixture(autouse=True) +def cleanup_loggers(): + """Clean up loggers before and after each test.""" + clear_loggers() + yield + clear_loggers() + + +def test_basic_logging(capsys): + """Test basic logging functionality.""" + logger = get_logger("test.basic") + + logger.debug("Debug message", test_id=1) + logger.info("Info message", test_id=2) + logger.warning("Warning message", test_id=3) + logger.error("Error message", test_id=4) + + captured = capsys.readouterr() + assert "Debug message" in captured.out + assert "Info message" in captured.out + assert "Warning message" in captured.out + assert "Error message" in captured.out + + +def test_context_logging(capsys): + """Test context management.""" + logger = get_logger("test.context") + + with LogContext(request_id="req-123", user_id="user-456"): + logger.info("Inside context") + + with LogContext(order_id="order-789"): + logger.info("Nested context") + + logger.info("Outside context") + + captured = capsys.readouterr() + assert "Inside context" in captured.out + assert "request_id=req-123" in captured.out + assert "user_id=user-456" in captured.out + assert "Nested context" in captured.out + assert "order_id=order-789" in captured.out + + +def test_sensitive_data_filtering(capsys): + """Test sensitive data filtering.""" + logger = get_logger("test.sensitive") + + logger.info( + "User login", + username="john", + password="secret123", + token="abc-xyz-789", + email="john@example.com", + ) + + captured = capsys.readouterr() + assert "User login" in captured.out + # Sensitive data should be redacted or not appear in output + # Note: The filter sanitizes before logging, so sensitive data won't appear + + +def test_performance_measurement(capsys): + """Test performance measurement.""" + logger = get_logger("test.performance") + + import time + + with logger.measure_time("test_operation", operation_type="test"): + time.sleep(0.05) + + captured = capsys.readouterr() + assert "Starting test_operation" in captured.out + assert "Completed test_operation" in captured.out + + +def test_exception_logging(capsys): + """Test exception logging.""" + logger = get_logger("test.exception") + + try: + result = 1 / 0 + except Exception: + logger.exception("Division by zero error", operation="divide") + + captured = capsys.readouterr() + assert "Division by zero error" in captured.out + assert "ZeroDivisionError" in captured.out + + +def test_custom_config(capsys): + """Test custom configuration.""" + config = LoggerConfig( + name="test.custom", + level=LogLevel.DEBUG, + handlers=[ConsoleHandler(LogLevel.DEBUG)], + environment=Environment.DEVELOPMENT, + ) + + logger = get_logger("test.custom", config=config) + logger.debug("Custom config logger") + + captured = capsys.readouterr() + assert "Custom config logger" in captured.out + + +def test_logger_levels(): + """Test that different log levels work correctly.""" + logger = get_logger("test.levels") + + # Should not raise exceptions + logger.debug("Debug level") + logger.info("Info level") + logger.warning("Warning level") + logger.error("Error level") + logger.critical("Critical level") + + +def test_clear_loggers(): + """Test that clear_loggers removes cached instances.""" + logger1 = get_logger("test.clear1") + logger2 = get_logger("test.clear1") + assert logger1 is logger2 # Same instance from cache + + clear_loggers() + + logger3 = get_logger("test.clear1") + # Can't test identity after clear since fixture also clears + + +def test_reserved_attributes_filtered(): + """Test that reserved LogRecord attributes are filtered out.""" + logger = get_logger("test.reserved") + + # Should not raise KeyError for reserved attributes + logger.info("Test message", module="should_be_filtered", name="also_filtered") + # If we get here without exception, the test passes + + +def test_environment_config(): + """Test environment-based configuration.""" + # Test development config + dev_logger = get_logger("test.dev", environment=Environment.DEVELOPMENT) + assert dev_logger is not None + + # Test testing config + clear_loggers() + test_logger = get_logger("test.test", environment=Environment.TESTING) + assert test_logger is not None + + +def test_multiple_loggers(): + """Test that multiple loggers can coexist.""" + logger1 = get_logger("test.logger1") + logger2 = get_logger("test.logger2") + + assert logger1 is not logger2 + assert logger1.config.name == "test.logger1" + assert logger2.config.name == "test.logger2" + + +def test_log_with_extra_fields(capsys): + """Test logging with extra fields.""" + logger = get_logger("test.extra") + + logger.info( + "Order processed", + order_id="ORD-123", + user_id="USR-456", + amount=99.99, + currency="EUR", + ) + + captured = capsys.readouterr() + assert "Order processed" in captured.out From 4dc8366af122d22a727b42868dcd471518590364 Mon Sep 17 00:00:00 2001 From: PhilippTheServer Date: Sat, 6 Dec 2025 16:16:45 +0100 Subject: [PATCH 13/51] docs(logger): add usage examples - Practical examples for logger usage - Demonstrate all major features --- examples/logger_usage.py | 64 ++++++++++++++++++++++++++++++++++++++++ 1 file changed, 64 insertions(+) create mode 100644 examples/logger_usage.py diff --git a/examples/logger_usage.py b/examples/logger_usage.py new file mode 100644 index 0000000..82bad2b --- /dev/null +++ b/examples/logger_usage.py @@ -0,0 +1,64 @@ +""" +Example usage of the refactored logger module. + +This demonstrates how to use the logger in your application code. +""" + +from app.shared.logger import get_logger, LogContext + +# Create logger for this module +logger = get_logger(__name__) + + +def example_basic_usage(): + """Example of basic logging.""" + logger.info("Application started") + logger.debug("Debug information", component="example") + logger.warning("Warning message", threshold=80) + + +def example_with_context(): + """Example of logging with context.""" + with LogContext(request_id="req-12345", user_id="user-67890"): + logger.info("Received user request") + logger.info("Processing order", order_id="ord-999") + + +def example_exception_handling(): + """Example of exception logging.""" + try: + risky_operation() + except Exception: + logger.exception("Failed to process", operation="risky") + + +def example_performance_tracking(): + """Example of performance measurement.""" + with logger.measure_time("database_query", table="users"): + # Simulate database operation + import time + + time.sleep(0.05) + + +def risky_operation(): + """Simulate a risky operation.""" + raise ValueError("Something went wrong!") + + +if __name__ == "__main__": + print("Running logger examples...\n") + + example_basic_usage() + print() + + example_with_context() + print() + + example_exception_handling() + print() + + example_performance_tracking() + print() + + print("Examples completed!") From 807334f80f42a96034c99ad8e20c423543769f8c Mon Sep 17 00:00:00 2001 From: PhilippTheServer Date: Sat, 6 Dec 2025 16:17:24 +0100 Subject: [PATCH 14/51] docs: add logger and testing documentation - Comprehensive logger documentation with examples - Generic testing guide for pytest setup - Best practices and troubleshooting --- docs/logger.md | 1200 +++++++++++++++++++++++++++++++++++++++++++++++ docs/testing.md | 471 +++++++++++++++++++ 2 files changed, 1671 insertions(+) create mode 100644 docs/logger.md create mode 100644 docs/testing.md diff --git a/docs/logger.md b/docs/logger.md new file mode 100644 index 0000000..7666617 --- /dev/null +++ b/docs/logger.md @@ -0,0 +1,1200 @@ +# Logger Documentation + +## Overview + +The OpenTaberna logging system is a production-ready, enterprise-grade logger built following SOLID principles. It provides structured logging, sensitive data filtering, context management, and environment-specific configurations out of the box. + + +## Table of Contents + +- [Quick Start](#quick-start) +- [Module Structure](#module-structure) +- [Architecture](#architecture) +- [SOLID Principles](#solid-principles) +- [Core Components](#core-components) +- [Usage Examples](#usage-examples) +- [Configuration](#configuration) +- [Best Practices](#best-practices) +- [Advanced Usage](#advanced-usage) +- [Extending the Logger](#extending-the-logger) + +--- + +## Module Structure + +The logger is organized into focused, single-responsibility modules: + +``` +src/app/shared/logger/ +├── __init__.py # Public API exports +├── enums.py # Enums & Constants (LogLevel, Environment) +├── interfaces.py # Abstract base classes (ILogFormatter, ILogFilter, ILogHandler) +├── formatters.py # Formatter implementations (JSONFormatter, ConsoleFormatter) +├── filters.py # Filter implementations (SensitiveDataFilter, LevelFilter) +├── handlers.py # Handler implementations (ConsoleHandler, FileHandler, etc.) +├── config.py # Configuration classes (LoggerConfig) +├── context.py # Context management (LogContext) +├── logger.py # Main AppLogger class +├── factory.py # Factory functions (get_logger, clear_loggers) +└── README.md # Module-specific documentation +``` + +--- + +## Quick Start + +### Basic Usage + +```python +from app.shared.logger import get_logger + +# Create logger for your module +logger = get_logger(__name__) + +# Log messages +logger.debug("Detailed debug information") +logger.info("General information", user_id="123") +logger.warning("Warning message", resource="inventory") +logger.error("Error occurred", error_code="E001") +logger.critical("Critical system failure", system="database") + +# Log exceptions with traceback +try: + risky_operation() +except Exception: + logger.exception("Operation failed", operation="data_import") +``` + +### With Context + +```python +from app.shared.logger import get_logger, LogContext + +logger = get_logger(__name__) + +# All logs within this context will include request_id and user_id +with LogContext(request_id="abc-123", user_id="456"): + logger.info("Processing user request") + logger.info("Fetching user data") + # Both logs will have request_id and user_id attached +``` + +### Performance Tracking + +```python +# Automatically log execution time +with logger.measure_time("database_query", table="items", operation="SELECT"): + results = db.execute(query) +``` + +--- + +## Architecture + +The logger follows a modular architecture with clear separation of concerns: + +``` +┌─────────────────┐ +│ AppLogger │ ← Main orchestrator (logger.py) +└────────┬────────┘ + │ + ┌────┴────┐ + │ │ +┌───▼───┐ ┌──▼──────┐ ┌──────────┐ +│Format │ │ Handler │ │ Filter │ +│ ter │ │ │ │ │ +└───────┘ └─────────┘ └──────────┘ + │ │ │ + ├─JSON ├─Console ├─Sensitive Data + └─Console ├─File └─Level + └─Daily Rotating + +Factory (factory.py) ──> Creates & Caches ──> AppLogger +Config (config.py) ──> Configures ──────> AppLogger +Context (context.py) ──> Adds metadata ───> Logs +``` + +### Module Responsibilities + +| Module | Responsibility | Lines | Principle | +|--------|---------------|-------|-----------| +| `enums.py` | Define LogLevel and Environment enums | ~18 | SRP | +| `interfaces.py` | Abstract base classes for extension | ~40 | ISP, DIP | +| `formatters.py` | Format log records (JSON, Console) | ~98 | SRP, OCP | +| `filters.py` | Filter and sanitize log data | ~68 | SRP, OCP | +| `handlers.py` | Output handlers (Console, File, etc.) | ~96 | SRP, LSP | +| `config.py` | Configuration and environment presets | ~113 | SRP, DIP | +| `context.py` | Thread-safe context management | ~59 | SRP | +| `logger.py` | Main AppLogger orchestration | ~124 | SRP, DIP | +| `factory.py` | Logger creation and caching | ~52 | SRP | +| `__init__.py` | Public API exports | ~73 | - | + +### Components Hierarchy + +1. **Interfaces (Abstractions)** - `interfaces.py` + - `ILogFormatter`: Defines formatting behavior + - `ILogHandler`: Defines handler setup + - `ILogFilter`: Defines filtering/sanitization + +2. **Implementations** + - **Formatters** (`formatters.py`): `JSONFormatter`, `ConsoleFormatter` + - **Handlers** (`handlers.py`): `ConsoleHandler`, `FileHandler`, `DailyRotatingFileHandler` + - **Filters** (`filters.py`): `SensitiveDataFilter`, `LevelFilter` + +3. **Configuration** - `config.py` + - `LoggerConfig`: Composes handlers, formatters, and filters + - Environment-specific presets (dev, test, staging, production) + +4. **Context Management** - `context.py` + - `LogContext`: Thread-safe context manager + - Request-scoped metadata storage + +5. **Orchestration** + - **Main Logger** (`logger.py`): `AppLogger` coordinates all components + - **Factory** (`factory.py`): `get_logger()` creates and caches instances + +--- + +## SOLID Principles + +### Single Responsibility Principle (SRP) + +Each class has one reason to change: + +- **`JSONFormatter`**: Only formats logs as JSON +- **`SensitiveDataFilter`**: Only removes sensitive data +- **`ConsoleHandler`**: Only manages console output +- **`AppLogger`**: Only orchestrates logging operations + +### Open/Closed Principle (OCP) + +The system is open for extension, closed for modification. Create a new file or add to existing implementation files: + +```python +# In formatters.py or new file - Add a new formatter +from app.shared.logger.interfaces import ILogFormatter +import logging + +class XMLFormatter(ILogFormatter): + def format(self, record: logging.LogRecord) -> str: + # Custom XML formatting + return f"{record.getMessage()}" + +# In handlers.py or new file - Add a new handler +from app.shared.logger.interfaces import ILogHandler, ILogFormatter + +class SlackHandler(ILogHandler): + def __init__(self, webhook_url: str): + self.webhook_url = webhook_url + + def setup(self, logger: logging.Logger, formatter: ILogFormatter) -> None: + # Send logs to Slack + handler = SlackWebhookHandler(self.webhook_url) + logger.addHandler(handler) +``` + +### Liskov Substitution Principle (LSP) + +All handlers/formatters/filters are interchangeable: + +```python +# Any formatter implementing ILogFormatter works +formatter = JSONFormatter() # or ConsoleFormatter() + +# Any handler implementing ILogHandler works +handler = ConsoleHandler() # or FileHandler() or DailyRotatingFileHandler() +``` + +### Interface Segregation Principle (ISP) + +Focused, minimal interfaces: + +```python +class ILogFormatter(ABC): + @abstractmethod + def format(self, record: logging.LogRecord) -> str: + pass # Only formatting responsibility + +class ILogHandler(ABC): + @abstractmethod + def setup(self, logger: logging.Logger, formatter: ILogFormatter) -> None: + pass # Only handler setup responsibility +``` + +### Dependency Inversion Principle (DIP) + +Depend on abstractions, not concretions: + +```python +class AppLogger: + def __init__(self, config: LoggerConfig): + # Depends on ILogHandler interface, not specific handlers + for handler in config.handlers: # ILogHandler instances + handler.setup(self._logger, formatter) +``` + +--- + +## Core Components + +### Formatters + +#### JSONFormatter + +Structured JSON output for production environments and log aggregation systems. + +```python +from app.shared.logger import JSONFormatter, LoggerConfig, get_logger +from pathlib import Path + +config = LoggerConfig( + name="my_app", + handlers=[ + FileHandler(Path("/var/log/app.log")) + ] +) +logger = get_logger("my_app", config=config) +``` + +**Output:** +```json +{ + "timestamp": "2025-12-06T14:30:45.123456", + "level": "INFO", + "logger": "my_app.service", + "message": "User logged in", + "module": "auth", + "function": "login", + "line": 42, + "context": { + "request_id": "abc-123", + "user_id": "456" + }, + "extra": { + "email": "user@example.com" + } +} +``` + +#### ConsoleFormatter + +Human-readable output with optional colors for development. + +```python +from app.shared.logger import ConsoleFormatter + +# Automatically used in development environment +logger = get_logger(__name__) +``` + +**Output:** +``` +[2025-12-06 14:30:45] INFO my_app.service: User logged in | request_id=abc-123 user_id=456 +``` + +### Handlers + +#### ConsoleHandler + +Outputs to stdout/stderr. + +```python +from app.shared.logger import ConsoleHandler, LogLevel + +handler = ConsoleHandler(level=LogLevel.INFO) +``` + +#### FileHandler + +Rotating file handler (size-based rotation). + +```python +from app.shared.logger import FileHandler +from pathlib import Path + +handler = FileHandler( + filepath=Path("/var/log/app.log"), + level=LogLevel.INFO, + max_bytes=10 * 1024 * 1024, # 10MB + backup_count=5 # Keep 5 backup files +) +``` + +#### DailyRotatingFileHandler + +Time-based rotation (daily at midnight). + +```python +from app.shared.logger import DailyRotatingFileHandler +from pathlib import Path + +handler = DailyRotatingFileHandler( + filepath=Path("/var/log/app.log"), + level=LogLevel.INFO, + backup_count=30 # Keep 30 days of logs +) +``` + +### Filters + +#### SensitiveDataFilter + +Automatically redacts sensitive information: + +- Passwords, tokens, API keys +- Authorization headers +- Credit card numbers, SSNs +- Session IDs, cookies + +```python +logger.info("User authenticated", password="secret123", token="xyz789") +# Output: password="***REDACTED***", token="***REDACTED***" +``` + +**Protected keywords:** +- `password`, `passwd`, `pwd` +- `secret`, `token`, `api_key`, `apikey` +- `authorization`, `auth`, `credential` +- `private_key`, `access_token`, `refresh_token` +- `session_id`, `cookie`, `csrf_token` +- `ssn`, `credit_card`, `cvv`, `pin` + +#### LevelFilter + +Filter logs by minimum level. + +```python +from app.shared.logger import LevelFilter, LogLevel + +filter = LevelFilter(min_level=LogLevel.WARNING) +``` + +--- + +## Usage Examples + +### Basic Logging + +```python +from app.shared.logger import get_logger + +logger = get_logger(__name__) + +# Simple messages +logger.info("Application started") +logger.debug("Debug information", variable=value) + +# With structured data +logger.info( + "Order created", + order_id="ORD-123", + user_id="USR-456", + total_amount=99.99, + currency="EUR" +) +``` + +### Exception Logging + +```python +try: + process_payment(order_id) +except PaymentError as e: + logger.exception( + "Payment processing failed", + order_id=order_id, + error_type=type(e).__name__ + ) + raise + +# Or with manual exception info +try: + risky_operation() +except Exception: + logger.error( + "Operation failed", + exc_info=True, + operation="data_sync" + ) +``` + +### Context Management + +```python +from app.shared.logger import get_logger, LogContext + +logger = get_logger(__name__) + +# Request-scoped logging +with LogContext(request_id="req-123", user_id="user-456"): + logger.info("Request received") + + # Nested contexts merge + with LogContext(order_id="ord-789"): + logger.info("Processing order") + # This log has request_id, user_id, AND order_id + +# Context automatically cleaned up after block +logger.info("Outside context") # No request_id here +``` + +### Performance Measurement + +```python +# Measure and log execution time +with logger.measure_time("database_query", query_type="SELECT", table="items"): + results = database.execute(query) + +# Logs: +# [DEBUG] Starting database_query | query_type=SELECT table=items +# [INFO] Completed database_query | query_type=SELECT table=items duration_ms=45.23 + +# If exception occurs +with logger.measure_time("api_call", endpoint="/users"): + response = requests.get(url) + response.raise_for_status() + +# On error logs: +# [ERROR] Failed api_call | endpoint=/users duration_ms=1234.56 [+ exception trace] +``` + +### FastAPI Integration + +```python +from fastapi import FastAPI, Request +from app.shared.logger import get_logger, LogContext +import uuid + +app = FastAPI() +logger = get_logger(__name__) + +@app.middleware("http") +async def log_requests(request: Request, call_next): + request_id = str(uuid.uuid4()) + + with LogContext( + request_id=request_id, + path=request.url.path, + method=request.method + ): + logger.info("Request started") + + try: + response = await call_next(request) + logger.info( + "Request completed", + status_code=response.status_code + ) + return response + except Exception: + logger.exception("Request failed") + raise + +@app.get("/items/{item_id}") +async def get_item(item_id: str): + # All logs here automatically have request context + logger.info("Fetching item", item_id=item_id) + + with logger.measure_time("database_fetch", item_id=item_id): + item = await database.get_item(item_id) + + return item +``` + +--- + +## Configuration + +### Environment-Based Configuration + +The logger automatically configures itself based on the `ENVIRONMENT` variable: + +```bash +# Set environment +export ENVIRONMENT=production # or development, staging, testing +``` + +```python +from app.shared.logger import get_logger + +# Automatically uses appropriate config +logger = get_logger(__name__) +``` + +### Environment Configurations + +#### Development +```python +Environment.DEVELOPMENT +├─ Level: DEBUG +├─ Handlers: Console (colored, human-readable) +├─ Filters: SensitiveDataFilter +└─ Output: Colored console output +``` + +#### Testing +```python +Environment.TESTING +├─ Level: WARNING (reduced noise) +├─ Handlers: Console +├─ Filters: SensitiveDataFilter +└─ Output: Console warnings and errors only +``` + +#### Staging +```python +Environment.STAGING +├─ Level: INFO +├─ Handlers: +│ ├─ Console (INFO+) +│ ├─ File: app.log (INFO+, 50MB rotation, 5 backups) +│ └─ File: error.log (ERROR+, 50MB rotation, 5 backups) +├─ Filters: SensitiveDataFilter +└─ Output: Console + rotating files (JSON) +``` + +#### Production +```python +Environment.PRODUCTION +├─ Level: INFO +├─ Handlers: +│ ├─ Console (WARNING+ only) +│ ├─ DailyFile: app.log (INFO+, 30 days) +│ └─ DailyFile: error.log (ERROR+, 90 days) +├─ Filters: SensitiveDataFilter +└─ Output: JSON logs with daily rotation +``` + +### Custom Configuration + +```python +from app.shared.logger import ( + get_logger, + LoggerConfig, + LogLevel, + ConsoleHandler, + FileHandler, + JSONFormatter, + SensitiveDataFilter, + Environment +) +from pathlib import Path + +# Create custom configuration +config = LoggerConfig( + name="custom_app", + level=LogLevel.DEBUG, + handlers=[ + ConsoleHandler(LogLevel.INFO), + FileHandler( + filepath=Path("/custom/path/app.log"), + level=LogLevel.DEBUG, + max_bytes=100 * 1024 * 1024, # 100MB + backup_count=10 + ) + ], + filters=[SensitiveDataFilter()], + environment=Environment.PRODUCTION +) + +logger = get_logger("custom_app", config=config) +``` + +### Manual Environment Configuration + +```python +from app.shared.logger import get_logger, Environment +from pathlib import Path + +logger = get_logger( + __name__, + environment=Environment.PRODUCTION, + log_dir=Path("/var/log/myapp") +) +``` + +--- + +## Best Practices + +### 1. Use Module-Level Loggers + +```python +# ✅ Good: Use __name__ for automatic module tracking +from app.shared.logger import get_logger + +logger = get_logger(__name__) + +# ❌ Bad: Hardcoded names +logger = get_logger("my_logger") +``` + +**Note:** Avoid using reserved LogRecord attribute names as keyword arguments. Reserved names include: +`name`, `msg`, `args`, `created`, `filename`, `funcName`, `levelname`, `levelno`, `lineno`, `module`, `msecs`, `message`, `pathname`, `process`, `processName`, `relativeCreated`, `thread`, `threadName`, `exc_info`, `exc_text`, `stack_info`, `taskName` + +```python +# ✅ Good: Use custom names +logger.info("Processing", component="auth", item_count=5) + +# ❌ Bad: Using reserved names (will be filtered out) +logger.info("Processing", module="auth", message="test") +``` + +### 2. Log Structured Data + +```python +# ✅ Good: Structured fields for easy querying +logger.info( + "Order processed", + order_id="ORD-123", + user_id="USR-456", + amount=99.99, + status="completed" +) + +# ❌ Bad: Unstructured string interpolation +logger.info(f"Order {order_id} processed for user {user_id} amount {amount}") +``` + +### 3. Use Appropriate Log Levels + +```python +# DEBUG: Detailed diagnostic information +logger.debug("Variable state", user_dict=user_data) + +# INFO: General informational messages +logger.info("User login successful", user_id="123") + +# WARNING: Warning messages (recoverable issues) +logger.warning("API rate limit approaching", usage_percent=85) + +# ERROR: Error messages (handled exceptions) +logger.error("Failed to process payment", order_id="ORD-123", exc_info=True) + +# CRITICAL: Critical errors (system failures) +logger.critical("Database connection lost", attempts=3) +``` + +### 4. Use Context for Request Tracking + +```python +# ✅ Good: All logs in context share common fields +with LogContext(request_id=request_id, user_id=user_id): + logger.info("Processing request") + service.process() + logger.info("Request completed") + +# ❌ Bad: Repeating context in every log +logger.info("Processing request", request_id=request_id, user_id=user_id) +logger.info("Request completed", request_id=request_id, user_id=user_id) +``` + +### 5. Use Exception Logging + +```python +# ✅ Good: Include full traceback +try: + risky_operation() +except Exception: + logger.exception("Operation failed", operation="import") + +# ✅ Also good: Manual exc_info +try: + risky_operation() +except ValueError as e: + logger.error("Invalid value", exc_info=True, value=str(e)) + +# ❌ Bad: Losing stack trace +except Exception as e: + logger.error(f"Error: {e}") +``` + +### 6. Measure Performance for Critical Operations + +```python +# ✅ Good: Automatic timing and error handling +with logger.measure_time("external_api_call", service="payment"): + response = payment_api.charge(amount) + +# Automatically logs: +# - Start of operation +# - Duration on success +# - Duration and exception on failure +``` + +### 7. Don't Log Sensitive Data + +The logger filters common sensitive fields, but be mindful: + +```python +# ✅ Good: Sensitive fields automatically redacted +logger.info("User authenticated", password=pwd, token=token) +# Output: password="***REDACTED***", token="***REDACTED***" + +# ✅ Good: Log IDs instead of full data +logger.info("User data updated", user_id=user.id) + +# ❌ Bad: Logging entire objects with PII +logger.info("User data", user_data=user.__dict__) +``` + +### 8. Use Consistent Naming Conventions + +```python +# ✅ Good: Consistent field names across codebase +logger.info("Event", user_id="123", order_id="ORD-456") +logger.info("Another event", user_id="789", order_id="ORD-123") + +# ❌ Bad: Inconsistent naming +logger.info("Event", user="123", order_id="ORD-456") +logger.info("Another event", user_id="789", order="ORD-123") +``` + +--- + +## Advanced Usage + +### Custom Formatter + +Create your custom formatter in a new file or add to `formatters.py`: + +```python +# In src/app/shared/logger/formatters.py or custom file +from app.shared.logger.interfaces import ILogFormatter +import logging + +class CustomFormatter(ILogFormatter): + def format(self, record: logging.LogRecord) -> str: + return f"[CUSTOM] {record.levelname}: {record.getMessage()}" + +# Use custom formatter +from app.shared.logger import get_logger, LoggerConfig, ConsoleHandler + +config = LoggerConfig( + name="custom", +### Custom Handler + +Create your custom handler in a new file or add to `handlers.py`: + +```python +# In src/app/shared/logger/handlers.py or custom file +from app.shared.logger.interfaces import ILogHandler, ILogFormatter +from app.shared.logger.enums import LogLevel +import logging + +class DatabaseHandler(ILogHandler): + """Log to database.""" + + def __init__(self, level: LogLevel = LogLevel.ERROR): + self.level = level + + def setup(self, logger: logging.Logger, formatter: ILogFormatter) -> None: + from app.shared.logger.handlers import _FormatterWrapper + + class DBHandler(logging.Handler): + def __init__(self, db_connection): + super().__init__() + self.db = db_connection + + def emit(self, record): + # Save to database + log_data = self.format(record) +### Custom Filter + +Create your custom filter in a new file or add to `filters.py`: + +```python +# In src/app/shared/logger/filters.py or custom file +from app.shared.logger.interfaces import ILogFilter +from typing import Any, Dict +import logging + +class IPFilter(ILogFilter): + """Filter logs from specific IP addresses.""" + + def __init__(self, blocked_ips: list): + self.blocked_ips = blocked_ips + + def filter(self, record: logging.LogRecord) -> bool: + ip = getattr(record, 'ip_address', None) + return ip not in self.blocked_ips + + def sanitize(self, data: Dict[str, Any]) -> Dict[str, Any]: + # No sanitization needed for this filter + return data + +# Use in config +from app.shared.logger import LoggerConfig + +config = LoggerConfig( + name="filtered", + filters=[IPFilter(blocked_ips=["192.168.1.100"])] +) +``` + def filter(self, record: logging.LogRecord) -> bool: + ip = getattr(record, 'ip_address', None) + return ip not in self.blocked_ips + + def sanitize(self, data: dict) -> dict: + return data + +# Use in config +config = LoggerConfig( + name="filtered", + filters=[IPFilter(blocked_ips=["192.168.1.100"])] +) +``` + +### Multiple Loggers + +```python +# Different loggers for different purposes +app_logger = get_logger("app") +security_logger = get_logger("security") +audit_logger = get_logger("audit") + +app_logger.info("Application event") +security_logger.warning("Security event", threat_level="medium") +audit_logger.info("Audit trail", action="user_delete", target_id="123") +``` + +### Testing with Logger + +```python +from app.shared.logger import get_logger, clear_loggers, LoggerConfig, Environment + +def test_my_function(): + # Clear any cached loggers + clear_loggers() + + # Use testing environment (WARNING level, less noise) + logger = get_logger(__name__, environment=Environment.TESTING) + + # Your test code + result = my_function() + + assert result is not None +``` + +--- + +## Extending the Logger + +### Adding a Slack Handler + +```python +from app.shared.logger import ILogHandler, ILogFormatter +import logging +import requests + +class SlackHandler(ILogHandler): + """Send critical logs to Slack.""" + + def __init__(self, webhook_url: str, level=logging.ERROR): + self.webhook_url = webhook_url + self.level = level + + def setup(self, logger: logging.Logger, formatter: ILogFormatter) -> None: + handler = SlackWebhookHandler(self.webhook_url) + handler.setLevel(self.level) + logger.addHandler(handler) + +class SlackWebhookHandler(logging.Handler): + def __init__(self, webhook_url: str): + super().__init__() + self.webhook_url = webhook_url + + def emit(self, record: logging.LogRecord): + message = self.format(record) + requests.post( + self.webhook_url, + json={"text": message} + ) + +# Use in production +config = LoggerConfig( + name="app", + handlers=[ + ConsoleHandler(), + SlackHandler(webhook_url="https://hooks.slack.com/...") + ] +) +``` + +### Adding Sentry Integration + +```python +import sentry_sdk +from sentry_sdk.integrations.logging import LoggingIntegration + +# Initialize Sentry with logging integration +sentry_logging = LoggingIntegration( + level=logging.INFO, + event_level=logging.ERROR +) + +sentry_sdk.init( + dsn="your-sentry-dsn", + integrations=[sentry_logging] +) + +# Use logger normally - errors automatically sent to Sentry +logger = get_logger(__name__) +logger.error("This will appear in Sentry") +``` + +### Adding Metrics Collection + +```python +from app.shared.logger import AppLogger +from prometheus_client import Counter + +class MetricsLogger(AppLogger): + """Logger with Prometheus metrics.""" + + def __init__(self, config): + super().__init__(config) + self.error_counter = Counter( + 'app_errors_total', + 'Total application errors', + ['level'] + ) + + def error(self, message: str, **kwargs): + self.error_counter.labels(level='error').inc() + super().error(message, **kwargs) + +## Troubleshooting + +### Logs Not Appearing + +```python +# Check logger configuration +logger = get_logger(__name__) +print(f"Logger level: {logger._logger.level}") +print(f"Handlers: {logger._logger.handlers}") + +# Ensure environment is set correctly +import os +print(f"Environment: {os.getenv('ENVIRONMENT', 'not set')}") + +# Check if handlers are properly configured +for handler in logger._logger.handlers: + print(f"Handler: {handler.__class__.__name__}, Level: {handler.level}") +``` + +### Reserved Attribute Conflicts + +If you see `KeyError: "Attempt to overwrite 'X' in LogRecord"`, you're using a reserved attribute name: + +```python +# ❌ Bad: Using reserved attribute +logger.info("Message", module="auth") # 'module' is reserved + +# ✅ Good: Use different name +logger.info("Message", component="auth") # 'component' is safe +``` + +The logger automatically filters out reserved attributes to prevent this error.ger = get_logger(__name__) +print(f"Logger level: {logger._logger.level}") +print(f"Handlers: {logger._logger.handlers}") + +# Ensure environment is set correctly +import os +print(f"Environment: {os.getenv('ENVIRONMENT', 'not set')}") +``` + +### Sensitive Data Not Filtered + +```python +# Check if SensitiveDataFilter is active +from app.shared.logger import SensitiveDataFilter + +config = logger.config +has_filter = any(isinstance(f, SensitiveDataFilter) for f in config.filters) +print(f"Has sensitive filter: {has_filter}") + +# Add custom sensitive keywords +filter = SensitiveDataFilter() +filter.SENSITIVE_KEYS.add("my_sensitive_field") +``` + +### Performance Issues + +```python +# Use appropriate log levels in production +# Set to INFO or WARNING, not DEBUG + +# Use lazy logging +logger.debug("Expensive operation: %s", lambda: expensive_function()) + +# Or check level before expensive operations +if logger._logger.isEnabledFor(logging.DEBUG): + debug_data = expensive_debug_info() + logger.debug("Debug info", data=debug_data) +``` + +### File Permissions + +```bash +# Ensure log directory exists and is writable +sudo mkdir -p /var/log/opentaberna +sudo chown $USER:$USER /var/log/opentaberna +chmod 755 /var/log/opentaberna +``` + +--- + +## API Reference + +### Functions + +#### `get_logger(name, config=None, environment=None, log_dir=None)` + +Get or create a logger instance. + +**Parameters:** +- `name` (str): Logger name (typically `__name__`) +- `config` (LoggerConfig, optional): Custom configuration +- `environment` (Environment, optional): Environment type +- `log_dir` (Path, optional): Directory for log files + +**Returns:** `AppLogger` instance + +#### `clear_loggers()` + +Clear all cached logger instances. Useful for testing. + +#### `setup_request_logging(logger, request_id, **context)` + +Setup logging context for a request. Returns a `LogContext` instance. + +### Classes + +#### `AppLogger` + +Main logger class. + +**Methods:** +- `debug(message, **kwargs)`: Log debug message +- `info(message, **kwargs)`: Log info message +- `warning(message, **kwargs)`: Log warning message +- `error(message, exc_info=False, **kwargs)`: Log error message +- `critical(message, exc_info=True, **kwargs)`: Log critical message +- `exception(message, **kwargs)`: Log exception with traceback +- `measure_time(operation, **context)`: Context manager for timing + +#### `LogContext` + +Context manager for adding contextual information. + +```python +with LogContext(key1=value1, key2=value2): + # logs here include key1 and key2 + pass +``` + +#### `LoggerConfig` + +Configuration for logger setup. + +**Parameters:** +- `name` (str): Logger name +- `level` (LogLevel): Minimum log level +- `handlers` (List[ILogHandler]): List of handlers +- `filters` (List[ILogFilter]): List of filters +- `environment` (Environment): Deployment environment + +**Class Methods:** +- `from_environment(name, env, log_dir)`: Create config from environment + +### Enums + +#### `LogLevel` + +- `DEBUG` +- `INFO` +- `WARNING` +- `ERROR` +- `CRITICAL` + +#### `Environment` + +- `DEVELOPMENT` +- `TESTING` +- `STAGING` +- `PRODUCTION` + +--- + +## Migration Guide + +### From Python's logging module + +```python +# Before +import logging +logger = logging.getLogger(__name__) +logger.info("Message") + +# After +from app.shared.logger import get_logger +logger = get_logger(__name__) +logger.info("Message") +``` + +### From Loguru + +```python +# Before +from loguru import logger +logger.info("Message", user_id=123) + +# After +from app.shared.logger import get_logger +logger = get_logger(__name__) +logger.info("Message", user_id=123) +## Performance Considerations + +- **Log Level**: Use INFO or WARNING in production (avoid DEBUG) +- **Structured Data**: Pass objects as kwargs, not in message strings +- **Context**: Use `LogContext` instead of repeating fields +- **File Rotation**: Use daily rotation in production for better performance +- **Async Operations**: Logger is synchronous; for high-volume async apps, consider buffering +- **Reserved Attributes**: Automatically filtered (minimal overhead) + +--- + +## Module Development + +### Adding New Components + +The modular structure makes it easy to add new components: + +1. **New Formatter**: Add to `formatters.py` or create new file implementing `ILogFormatter` +2. **New Handler**: Add to `handlers.py` or create new file implementing `ILogHandler` +3. **New Filter**: Add to `filters.py` or create new file implementing `ILogFilter` +4. **Export**: Add to `__init__.py` if it should be part of public API + +### Running Tests + +```bash +# Set PYTHONPATH +export PYTHONPATH=/path/to/fastapi_opentaberna/src:$PYTHONPATH + +# Run tests +python3 tests/test_logger_module.py + +# Run examples +python3 examples/logger_usage.py +``` + +--- + +## Performance Considerations + +- **Log Level**: Use INFO or WARNING in production (avoid DEBUG) +- **Structured Data**: Pass objects as kwargs, not in message strings +- **Context**: Use `LogContext` instead of repeating fields +- **File Rotation**: Use daily rotation in production for better performance +- **Async Operations**: Logger is synchronous; for high-volume async apps, consider buffering diff --git a/docs/testing.md b/docs/testing.md new file mode 100644 index 0000000..e389f26 --- /dev/null +++ b/docs/testing.md @@ -0,0 +1,471 @@ +# Testing Documentation + +## Overview + +This document describes the testing setup for the OpenTaberna FastAPI project. The project uses pytest with automatic module path configuration, allowing you to test any component without manual PYTHONPATH management. + +## Table of Contents + +- [Setup](#setup) +- [Running Tests](#running-tests) +- [Writing Tests](#writing-tests) +- [Test Structure](#test-structure) +- [Best Practices](#best-practices) +- [Debugging](#debugging) + +--- + +## Setup + +### Installation + +```bash +# Install dependencies (pytest is included) +uv sync +# or +pip install -e . +``` + +### How It Works + +The project uses `conftest.py` in the root directory to automatically configure Python's import path: + +``` +fastapi_opentaberna/ +├── conftest.py # Auto-configures imports for pytest +├── src/ +│ └── app/ # Your application code here +├── tests/ # Your tests here +└── pyproject.toml +``` + +**`conftest.py`** adds `src/` to the Python path, so you can import modules naturally: + +```python +from app.shared.logger import get_logger +from app.services.crud import ItemService +from app.models import Item +``` + +**No manual PYTHONPATH needed!** Just run `pytest` and imports work automatically. + +--- + +## Running Tests + +```bash +# Run all tests +pytest + +# Verbose output (recommended) +pytest -v + +# Run specific test file +pytest tests/test_something.py + +# Run specific test function +pytest tests/test_something.py::test_function_name + +# Run tests matching a keyword +pytest -k "auth" + +# Stop on first failure +pytest -x + +# Show print statements (disable output capture) +pytest -s + +# See which tests exist without running +pytest --co -q +``` + +### Advanced Options + +```bash +# Parallel execution (faster) +pytest -n auto + +# With coverage report +pytest --cov=app --cov-report=html + +# Watch mode (re-run on file changes) +ptw +``` + +--- + +## Writing Tests + +### File Naming + +- Test files: `test_*.py` or `*_test.py` +- Test functions: `test_*()` +- Test classes: `Test*` + +### Basic Test Template + +```python +def test_something(): + """Always include a docstring describing what you're testing.""" + # Arrange - Set up test data + value = 42 + + # Act - Execute the code being tested + result = some_function(value) + + # Assert - Verify the result + assert result == expected_value +``` + +### Importing Your Code + +Thanks to `conftest.py`, imports work naturally: + +```python +# Import from any module in src/app/ +from app.shared.logger import get_logger +from app.services.items import ItemService +from app.models.user import User +from app.authorize.keycloak import verify_token +``` + +### Common Test Patterns + +#### Testing Functions + +```python +from app.services.calculator import add + +def test_add_two_numbers(): + """Test that add function works correctly.""" + result = add(2, 3) + assert result == 5 +``` + +#### Testing Classes + +```python +from app.services.user_service import UserService + +def test_user_service_create(): + """Test user creation.""" + service = UserService() + user = service.create(username="john", email="john@example.com") + + assert user.username == "john" + assert user.email == "john@example.com" +``` + +#### Testing with Fixtures + +```python +import pytest + +@pytest.fixture +def sample_user(): + """Provide a sample user for tests.""" + return {"username": "john", "email": "john@example.com"} + +def test_with_fixture(sample_user): + """Use the fixture in your test.""" + assert sample_user["username"] == "john" +``` + +#### Testing Exceptions + +```python +def test_division_by_zero(): + """Test that division by zero raises ValueError.""" + with pytest.raises(ValueError): + result = divide(10, 0) +``` + +#### Capturing Output + +```python +def test_logging_output(capsys): + """Test that correct message is logged.""" + from app.shared.logger import get_logger + + logger = get_logger("test") + logger.info("Hello World") + + captured = capsys.readouterr() + assert "Hello World" in captured.out +``` + +#### Parameterized Tests + +```python +@pytest.mark.parametrize("input,expected", [ + (2, 4), + (3, 9), + (4, 16), +]) +def test_square(input, expected): + """Test square function with multiple inputs.""" + assert square(input) == expected +``` + +#### Using Mocks + +```python +from unittest.mock import Mock, patch + +def test_with_mock(): + """Test using a mock object.""" + with patch('app.services.external_api.call') as mock_call: + mock_call.return_value = {"status": "success"} + + result = my_function() + + assert result["status"] == "success" + mock_call.assert_called_once() +``` + +--- + +## Test Structure + +### Organize Tests by Module + +``` +tests/ +├── test_logger.py # Logger tests +├── test_user_service.py # User service tests +├── test_item_service.py # Item service tests +├── test_api.py # API endpoint tests +└── integration/ # Integration tests + └── test_full_flow.py +``` + +### Use Classes for Grouping + +```python +class TestUserService: + """All tests for UserService.""" + + def test_create_user(self): + """Test user creation.""" + pass + + def test_update_user(self): + """Test user update.""" + pass + + def test_delete_user(self): + """Test user deletion.""" + pass +``` + +--- + +## Best Practices + +### 1. Descriptive Names + +```python +# ✅ Good +def test_user_service_creates_user_with_valid_email(): + pass + +# ❌ Bad +def test_user(): + pass +``` + +### 2. One Assertion Per Test (when possible) + +```python +# ✅ Good +def test_user_has_email(): + user = create_user() + assert user.email == "test@example.com" + +def test_user_has_username(): + user = create_user() + assert user.username == "testuser" + +# ❌ Bad +def test_user(): + user = create_user() + assert user.email == "test@example.com" + assert user.username == "testuser" + assert user.created_at is not None +``` + +### 3. Arrange-Act-Assert Pattern + +```python +def test_something(): + # Arrange - Set up data + value = 10 + + # Act - Execute function + result = multiply(value, 2) + + # Assert - Verify result + assert result == 20 +``` + +### 4. Use Fixtures for Setup + +```python +@pytest.fixture +def database(): + """Setup and teardown database.""" + db = create_test_db() + yield db + db.cleanup() + +def test_with_db(database): + result = database.query("SELECT 1") + assert result is not None +``` + +### 5. Test Independence + +Each test should be able to run alone and in any order: + +```python +# ✅ Good - Each test is self-contained +def test_feature_a(): + setup = create_setup() + result = test_feature_a(setup) + assert result is True + +def test_feature_b(): + setup = create_setup() + result = test_feature_b(setup) + assert result is True +``` + +### 6. Avoid Testing Implementation Details + +```python +# ❌ Bad - Testing internal implementation +def test_uses_specific_algorithm(): + assert service.internal_method() == "quicksort" + +# ✅ Good - Testing behavior +def test_sorts_items_correctly(): + items = [3, 1, 2] + result = service.sort(items) + assert result == [1, 2, 3] +``` + +### 7. Use Parametrization + +```python +@pytest.mark.parametrize("input,expected", [ + ("hello", "HELLO"), + ("world", "WORLD"), + ("", ""), +]) +def test_uppercase(input, expected): + assert uppercase(input) == expected +``` + +--- + +## Debugging + +### Debug Failed Tests + +```bash +# See full output (no capture) +pytest -s + +# Stop on first failure +pytest -x + +# Show local variables on failure +pytest -l + +# Drop into debugger on failure +pytest --pdb + +# More verbose output +pytest -vv +``` + +### Debug Specific Issues + +```python +# Add print statements (use -s flag) +def test_something(): + print(f"Debug: value = {value}") + assert value > 0 + +# Use pytest's built-in debugging +import pytest +def test_something(): + pytest.set_trace() # Debugger will stop here + result = my_function() +``` + +### Test Markers + +```python +# Mark tests to skip +@pytest.mark.skip(reason="Not ready yet") +def test_future_feature(): + pass + +# Mark slow tests +@pytest.mark.slow +def test_long_running(): + time.sleep(10) + +# Run only non-slow tests +# pytest -m "not slow" +``` + +--- + +## Common Issues + +### Module Not Found + +**Error:** `ModuleNotFoundError: No module named 'app'` + +**Solution:** Make sure `conftest.py` exists in project root. + +### Tests Not Discovered + +**Error:** `collected 0 items` + +**Solution:** +- Test files must be named `test_*.py` or `*_test.py` +- Test functions must start with `test_` +- Test classes must start with `Test` + +### Import Errors + +If imports don't work, check: +1. `conftest.py` exists in project root +2. Your code is in `src/app/` directory +3. You're running pytest from project root + +--- + +## Quick Reference + +```bash +# Essential Commands +pytest # Run all tests +pytest -v # Verbose output +pytest -x # Stop on first failure +pytest -s # Show print statements +pytest tests/test_file.py # Run specific file +pytest -k "keyword" # Run tests matching keyword + +# Common Patterns in Tests +from app.module import MyClass # Import your code +assert value == expected # Basic assertion +with pytest.raises(ValueError): # Test exceptions +@pytest.fixture # Create reusable setup +def test_name(capsys): # Capture output +``` + +That's it! Write your tests, run `pytest`, and iterate. From 4383843da0066dbc509e53f8ef25831454639819 Mon Sep 17 00:00:00 2001 From: PhilippTheServer Date: Sat, 6 Dec 2025 16:17:38 +0100 Subject: [PATCH 15/51] docs: add architecture and development guides - Architecture documentation with design principles - Development guide with workflows and patterns - Code quality guidelines and best practices --- docs/architecture.md | 420 ++++++++++++++++++++++++++++++ docs/development.md | 590 +++++++++++++++++++++++++++++++++++++++++++ 2 files changed, 1010 insertions(+) create mode 100644 docs/architecture.md create mode 100644 docs/development.md diff --git a/docs/architecture.md b/docs/architecture.md new file mode 100644 index 0000000..f7571c7 --- /dev/null +++ b/docs/architecture.md @@ -0,0 +1,420 @@ +# Architecture Documentation + +## Overview + +The OpenTaberna FastAPI project follows a **modular, scalable architecture** designed for long-term maintainability and growth. This document outlines the architectural design principles and code structure. + +## Table of Contents + +- [Project Structure](#project-structure) +- [Service Architecture](#service-architecture) +- [Why This Architecture](#why-this-architecture) + +--- + +## Design Principles + +The project is built on four core principles: + + +### 1. SOLID Principles + +All code follows SOLID principles for maintainable, extensible design: + +- **S**ingle Responsibility Principle - Each module has one reason to change +- **O**pen/Closed Principle - Open for extension, closed for modification +- **L**iskov Substitution Principle - Components are interchangeable through interfaces +- **I**nterface Segregation Principle - Focused, minimal interfaces +- **D**ependency Inversion Principle - Depend on abstractions, not concretions + +**Example:** The logger module demonstrates all SOLID principles with separate files for interfaces, implementations, and configuration. + +### 2. Maintainable Components + +Every shared component is designed to be **self-contained and reusable**: + +- **Logger** - Production-ready logging with structured output +- **Exceptions** - Centralized error handling +- **Authentication** - Keycloak integration +- **Database** - Connection and session management +- **Validation** - Input validation helpers + +**Goal:** Write once, use everywhere, never touch again. + +### 3. Modular Service Structure + +The API uses a **"mini-API" pattern** where each feature is a self-contained module: + +``` +services/ +├── crud-item-store/ # Feature: Item Store CRUD +│ ├── crud-item-store.py # Entry point (imports & registers) +│ ├── functions/ # Business logic +│ ├── models/ # Data models +│ ├── routers/ # API endpoints +│ └── services/ # External integrations +│ +└── user-management/ # Feature: User Management + ├── user-management.py # Entry point + ├── functions/ + ├── models/ + ├── routers/ + └── services/ +``` + +**Benefits:** +- Each feature can be developed independently +- Easy to onboard new developers to specific features +- Simple to test in isolation +- Clear ownership and responsibility +- Can scale to hundreds of features without complexity + +### 4. Everything is Testable + +**100% test coverage is the goal.** All code must be designed with testing in mind: + +- Pure functions where possible +- Dependency injection for external services +- Clear interfaces for mocking +- Isolated test environments + +Tests live in `tests/` and mirror the `src/` structure. + +--- + +## Project Structure + +``` +fastapi_opentaberna/ +├── src/ +│ └── app/ +│ ├── main.py # FastAPI application entry point +│ │ +│ ├── shared/ # Shared utilities & infrastructure +│ │ ├── logger/ # Logging system +│ │ ├── exceptions.py # Custom exceptions +│ │ ├── database.py # Database connections +│ │ └── validators.py # Input validation +│ │ +│ ├── authorize/ # Authentication & Authorization +│ │ └── keycloak.py # Keycloak integration +│ │ +│ └── services/ # Feature modules ("mini-APIs") +│ ├── crud-item-store/ +│ ├── user-management/ +│ └── order-processing/ +│ +├── tests/ # Test suite +│ ├── test_logger_module.py +│ ├── test_item_service.py +│ └── integration/ +│ +├── docs/ # Documentation +├── conftest.py # Pytest configuration +├── pyproject.toml # Project dependencies +└── README.md +``` + +### Core Components + +#### `main.py` - Application Entry Point + +The main FastAPI application that: +- Initializes the FastAPI app +- Registers middleware +- Includes routers from services +- Configures CORS, logging, etc. + +```python +from fastapi import FastAPI +from app.services.crud_item_store import crud_item_store + +app = FastAPI(title="OpenTaberna API") + +# Include service routers +app.include_router(crud_item_store.router, prefix="/api/v1") +``` + +#### `shared/` - Shared Infrastructure + +Reusable components used across all services: + +- **`logger/`** - Structured logging system +- **`exceptions.py`** - Custom exception classes +- **`database.py`** - Database connection management +- **`validators.py`** - Common validation functions +- **`utils.py`** - Utility functions + +**Rule:** Shared modules should be framework-agnostic and testable in isolation. + +#### `authorize/` - Authentication Module + +Handles authentication and authorization: + +- **`keycloak.py`** - Keycloak integration +- Token validation +- Role-based access control +- User session management + +#### `services/` - Feature Modules + +Each service is a **self-contained mini-API** with its own: +- Routes +- Models +- Business logic +- External service integrations + +--- + +## Service Architecture + +Each service follows a consistent structure for predictability and maintainability. + +### Service Structure + +``` +services/crud-item-store/ +├── crud-item-store.py # Entry point & router registration +│ +├── routers/ # API endpoints +│ ├── __init__.py +│ ├── items.py # GET, POST /items +│ └── categories.py # GET, POST /categories +│ +├── models/ # Data models & schemas +│ ├── __init__.py +│ ├── item.py # Pydantic models +│ └── category.py +│ +├── functions/ # Business logic +│ ├── __init__.py +│ ├── create_item.py # Pure business logic +│ ├── update_item.py +│ └── validate_item.py +│ +└── services/ # External integrations + ├── __init__.py + ├── database.py # Database queries + ├── cache.py # Redis cache + └── storage.py # File storage +``` + +### Entry Point Pattern + +The main service file (`crud-item-store.py`) acts as the entry point: + +```python +""" +CRUD Item Store Service + +Entry point for the item store feature. This file imports and registers +all routers for this service. +""" + +from fastapi import APIRouter +from .routers import items, categories + +# Create service router +router = APIRouter(prefix="/items", tags=["Items"]) + +# Include sub-routers +router.include_router(items.router) +router.include_router(categories.router) + +__all__ = ["router"] +``` + +### Layer Responsibilities + +#### 1. Routers (`routers/`) + +**Purpose:** HTTP request/response handling + +```python +from fastapi import APIRouter, Depends +from ..models.item import ItemCreate, ItemResponse +from ..functions.create_item import create_item_logic + +router = APIRouter() + +@router.post("/", response_model=ItemResponse) +async def create_item(item: ItemCreate): + """Create a new item.""" + return await create_item_logic(item) +``` + +**Rules:** +- Thin layer - only handle HTTP concerns +- Validate input with Pydantic models +- Call functions for business logic +- Return proper status codes +- No business logic here + +#### 2. Models (`models/`) + +**Purpose:** Data structure definitions + +```python +from pydantic import BaseModel, Field +from typing import Optional + +class ItemCreate(BaseModel): + """Schema for creating an item.""" + name: str = Field(..., min_length=1, max_length=100) + price: float = Field(..., gt=0) + category: str + +class ItemResponse(BaseModel): + """Schema for item responses.""" + id: str + name: str + price: float + category: str + created_at: datetime +``` + +**Rules:** +- Use Pydantic for validation +- Separate create/update/response models +- Include field validation rules +- Add docstrings + +#### 3. Functions (`functions/`) + +**Purpose:** Business logic + +```python +from ..models.item import ItemCreate, ItemResponse +from ..services.database import save_item +from app.shared.logger import get_logger + +logger = get_logger(__name__) + +async def create_item_logic(item: ItemCreate) -> ItemResponse: + """ + Business logic for creating an item. + + Args: + item: Item data to create + + Returns: + Created item with ID + + Raises: + ValueError: If item validation fails + """ + # Validate business rules + if item.price > 10000: + raise ValueError("Price exceeds maximum") + + # Save to database + created = await save_item(item) + + logger.info("Item created", item_id=created.id) + + return created +``` + +**Rules:** +- Pure business logic only +- No HTTP concerns (no status codes, no FastAPI dependencies) +- Testable in isolation +- Raise domain exceptions, not HTTP exceptions +- Log important actions + +#### 4. Services (`services/`) + +**Purpose:** External system integration + +```python +from sqlalchemy import select +from app.shared.database import get_session +from ..models.item import ItemCreate, ItemDB + +async def save_item(item: ItemCreate) -> ItemDB: + """ + Save item to database. + + Args: + item: Item to save + + Returns: + Saved item with generated ID + """ + async with get_session() as session: + db_item = ItemDB(**item.dict()) + session.add(db_item) + await session.commit() + await session.refresh(db_item) + return db_item +``` + +**Rules:** +- Handle external system communication +- Database queries, API calls, file I/O +- Return domain models, not ORM objects +- Handle connection errors gracefully +- Use dependency injection for testability + +### Data Flow + +``` +Request → Router → Function → Service → Database + ↓ + Validation + ↓ + Business Logic + ↓ +Response ← Router ← Result ← Service +``` + +--- + +## Why This Architecture? + +### Scalability + +- Add new features without affecting existing ones +- Each service can be developed by different teams +- Clear boundaries prevent merge conflicts +- Can scale to hundreds of services + +### Maintainability + +- Easy to find code (consistent structure) +- Changes are localized to specific services +- Shared components are tested once, used everywhere +- New developers onboard quickly + +### Testability + +- Business logic separated from framework code +- Dependencies can be mocked easily +- Each layer can be tested independently +- Fast test execution + +### Team Productivity + +- Multiple developers can work in parallel +- Clear ownership of features +- Predictable code organization +- Less time spent searching for code + +--- + +## Summary + +The OpenTaberna FastAPI architecture is designed for **long-term success**: + +1. **Ruff** ensures code quality automatically +2. **SOLID principles** make code maintainable +3. **Shared components** are built once, used everywhere +4. **Service structure** keeps features isolated and scalable +5. **Testing** is mandatory and built into the workflow + +Follow these principles, and the API will scale from 10 to 1000 endpoints without losing maintainability. + +**Next Steps:** +- Read [Development Guide](./development.md) for practical workflows +- Read [Logger Documentation](./logger.md) for logging system details +- Read [Testing Guide](./testing.md) for testing practices diff --git a/docs/development.md b/docs/development.md new file mode 100644 index 0000000..5f5fcb6 --- /dev/null +++ b/docs/development.md @@ -0,0 +1,590 @@ +# Development Guide + +## Overview + +This guide provides practical workflows and best practices for developing features in the OpenTaberna FastAPI project. + +## Table of Contents + +- [Adding a New Feature](#adding-a-new-feature) +- [Code Quality](#code-quality) +- [Code Review Checklist](#code-review-checklist) +- [Best Practices](#best-practices) +- [Common Patterns](#common-patterns) + +--- + +## Adding a New Feature + +### Step-by-Step Workflow + +1. **Create service directory:** + ```bash + mkdir -p src/app/services/my-feature/{routers,models,functions,services} + touch src/app/services/my-feature/my-feature.py + ``` + +2. **Define models** in `models/`: + ```python + # models/thing.py + from pydantic import BaseModel, Field + + class ThingCreate(BaseModel): + """Schema for creating a thing.""" + name: str = Field(..., min_length=1) + description: str | None = None + + class ThingResponse(BaseModel): + """Schema for thing responses.""" + id: str + name: str + description: str | None + created_at: datetime + ``` + +3. **Write business logic** in `functions/`: + ```python + # functions/create_thing.py + from ..models.thing import ThingCreate, ThingResponse + from app.shared.logger import get_logger + + logger = get_logger(__name__) + + async def create_thing_logic(thing: ThingCreate) -> ThingResponse: + """ + Business logic for creating a thing. + + Args: + thing: Thing data to create + + Returns: + Created thing with ID + """ + # Validate business rules + if not thing.name: + raise ValueError("Name is required") + + # Call service layer + created = await save_thing(thing) + + logger.info("Thing created", thing_id=created.id) + + return created + ``` + +4. **Add database operations** in `services/`: + ```python + # services/database.py + from sqlalchemy import select + from app.shared.database import get_session + from ..models.thing import ThingCreate, ThingDB + + async def save_thing(thing: ThingCreate) -> ThingDB: + """Save thing to database.""" + async with get_session() as session: + db_thing = ThingDB(**thing.dict()) + session.add(db_thing) + await session.commit() + await session.refresh(db_thing) + return db_thing + ``` + +5. **Create router** in `routers/`: + ```python + # routers/things.py + from fastapi import APIRouter, HTTPException, status + from ..models.thing import ThingCreate, ThingResponse + from ..functions.create_thing import create_thing_logic + + router = APIRouter() + + @router.post("/", response_model=ThingResponse, status_code=status.HTTP_201_CREATED) + async def create_thing(thing: ThingCreate): + """Create a new thing.""" + try: + return await create_thing_logic(thing) + except ValueError as e: + raise HTTPException(status_code=400, detail=str(e)) + ``` + +6. **Register in entry point:** + ```python + # my-feature.py + """ + My Feature Service + + Entry point for the my-feature module. + """ + + from fastapi import APIRouter + from .routers import things + + router = APIRouter(prefix="/my-feature", tags=["My Feature"]) + router.include_router(things.router) + + __all__ = ["router"] + ``` + +7. **Include in main app:** + ```python + # main.py + from fastapi import FastAPI + from app.services.my_feature import my_feature + + app = FastAPI(title="OpenTaberna API") + + app.include_router(my_feature.router, prefix="/api/v1") + ``` + +8. **Write tests:** + ```python + # tests/test_my_feature.py + from app.services.my_feature.functions.create_thing import create_thing_logic + from app.services.my_feature.models.thing import ThingCreate + + def test_create_thing(): + """Test thing creation logic.""" + thing = ThingCreate(name="Test Thing") + result = await create_thing_logic(thing) + + assert result.name == "Test Thing" + assert result.id is not None + ``` + +--- + +## Code Quality + +### Running Ruff + +```bash +# Format code (Black-compatible) +ruff format src/ tests/ + +# Check for issues +ruff check src/ tests/ + +# Check and auto-fix +ruff check --fix src/ tests/ + +# Combined (recommended before commit) +ruff format && ruff check --fix src/ && ruff check --fix tests/ +``` + +### Pre-commit Hook + +Add to `.git/hooks/pre-commit`: + +```bash +#!/bin/bash +echo "Running code quality checks..." + +ruff format && ruff check --fix src/ && ruff check --fix tests/ +if [ $? -ne 0 ]; then + echo "❌ Ruff checks failed!" + exit 1 +fi + +echo "Running tests..." +pytest +if [ $? -ne 0 ]; then + echo "❌ Tests failed!" + exit 1 +fi + +echo "✅ All checks passed!" +``` + +Make it executable: +```bash +chmod +x .git/hooks/pre-commit +``` + +### Ruff Configuration + +In `pyproject.toml`: + +```toml +[tool.ruff] +line-length = 100 +target-version = "py312" + +[tool.ruff.lint] +select = [ + "E", # pycodestyle errors + "W", # pycodestyle warnings + "F", # pyflakes + "I", # isort + "N", # pep8-naming +] +ignore = [] + +[tool.ruff.format] +quote-style = "double" +indent-style = "space" +``` + +--- + +## Code Review Checklist + +Before submitting a pull request, verify: + +### Architecture +- [ ] Follows SOLID principles +- [ ] Code is in the correct service directory +- [ ] Entry point file exports router correctly +- [ ] Service is self-contained (no cross-service imports) + +### Code Organization +- [ ] Routers only handle HTTP concerns +- [ ] Business logic is in `functions/` +- [ ] Database operations are in `services/` +- [ ] Models use Pydantic validation +- [ ] Clear separation of concerns + +### Code Quality +- [ ] All functions have docstrings +- [ ] Type hints are present +- [ ] No hardcoded values (use config) +- [ ] Proper error handling +- [ ] Logging for important actions +- [ ] Ruff passes without errors + +### Testing +- [ ] Tests cover all code paths +- [ ] Tests are independent +- [ ] Tests use fixtures appropriately +- [ ] Mock external dependencies +- [ ] All tests pass + +### Documentation +- [ ] README updated if needed +- [ ] API endpoints documented +- [ ] Complex logic has comments +- [ ] Breaking changes noted + +--- + +## Best Practices + +### 1. Keep Services Independent + +Services should not directly import from each other: + +```python +# ❌ Bad - Direct dependency +from app.services.user_management.functions.get_user import get_user + +# ✅ Good - Through shared interface +from app.shared.interfaces import UserService +user_service = UserService() +user = await user_service.get_user(id) +``` + +### 2. Use Dependency Injection + +```python +from typing import Protocol + +class ItemRepository(Protocol): + async def save(self, item): ... + async def get(self, id: str): ... + +async def create_item( + item: ItemCreate, + repo: ItemRepository # Injected, easy to mock +): + """Create item using injected repository.""" + return await repo.save(item) +``` + +### 3. Configuration Over Code + +```python +# ❌ Bad - Hardcoded +DATABASE_URL = "postgresql://localhost/db" +MAX_PRICE = 10000 + +# ✅ Good - From environment +from pydantic_settings import BaseSettings + +class Settings(BaseSettings): + database_url: str + max_item_price: float = 10000.0 + + class Config: + env_file = ".env" + +settings = Settings() +``` + +### 4. Fail Fast with Validation + +```python +from pydantic import BaseModel, Field, validator + +class Item(BaseModel): + name: str = Field(..., min_length=1, max_length=100) + price: float = Field(..., gt=0) + + @validator('price') + def price_must_be_reasonable(cls, v): + if v > 10000: + raise ValueError('Price exceeds maximum') + return v +``` + +### 5. Comprehensive Error Handling + +```python +from fastapi import HTTPException, status + +@router.post("/items") +async def create_item(item: ItemCreate): + """Create item with proper error handling.""" + try: + return await create_item_logic(item) + except ValueError as e: + raise HTTPException( + status_code=status.HTTP_400_BAD_REQUEST, + detail=str(e) + ) + except DatabaseError as e: + logger.error("Database error", error=str(e)) + raise HTTPException( + status_code=status.HTTP_500_INTERNAL_SERVER_ERROR, + detail="Internal server error" + ) +``` + +### 6. Document with Examples + +```python +async def create_item(item: ItemCreate) -> ItemResponse: + """ + Create a new item in the store. + + Args: + item: Item data with name, price, and category + + Returns: + Created item with generated ID and timestamp + + Raises: + ValueError: If price exceeds maximum (10,000) + + Example: + >>> item = ItemCreate(name="Chair", price=99.99, category="furniture") + >>> result = await create_item(item) + >>> result.id + "item-123" + """ + if item.price > 10000: + raise ValueError("Price exceeds maximum") + + return await save_item(item) +``` + +### 7. Use Structured Logging + +```python +from app.shared.logger import get_logger, LogContext + +logger = get_logger(__name__) + +async def process_order(order_id: str): + """Process order with contextual logging.""" + with LogContext(order_id=order_id): + logger.info("Processing order started") + + try: + result = await process(order_id) + logger.info("Order processed successfully", amount=result.total) + return result + except Exception as e: + logger.error("Order processing failed", error=str(e)) + raise +``` + +### 8. Type Hints Everywhere + +```python +from typing import List, Optional + +# ✅ Good - Clear types +async def get_items( + category: str, + limit: int = 10, + offset: int = 0 +) -> List[ItemResponse]: + """Get items with proper type hints.""" + return await fetch_items(category, limit, offset) + +# ❌ Bad - No type information +async def get_items(category, limit=10, offset=0): + return await fetch_items(category, limit, offset) +``` + +--- + +## Common Patterns + +### Pagination + +```python +from pydantic import BaseModel +from typing import Generic, TypeVar, List + +T = TypeVar('T') + +class PaginatedResponse(BaseModel, Generic[T]): + items: List[T] + total: int + page: int + page_size: int + has_next: bool + +@router.get("/items", response_model=PaginatedResponse[ItemResponse]) +async def list_items(page: int = 1, page_size: int = 20): + """List items with pagination.""" + items, total = await get_items_paginated(page, page_size) + + return PaginatedResponse( + items=items, + total=total, + page=page, + page_size=page_size, + has_next=(page * page_size) < total + ) +``` + +### Filtering + +```python +from typing import Optional + +class ItemFilters(BaseModel): + category: Optional[str] = None + min_price: Optional[float] = None + max_price: Optional[float] = None + search: Optional[str] = None + +@router.get("/items") +async def list_items(filters: ItemFilters = Depends()): + """List items with filters.""" + return await get_items_filtered(filters) +``` + +### Background Tasks + +```python +from fastapi import BackgroundTasks + +def send_email(email: str, message: str): + """Send email in background.""" + # Email sending logic + pass + +@router.post("/items") +async def create_item( + item: ItemCreate, + background_tasks: BackgroundTasks +): + """Create item and send notification.""" + created = await create_item_logic(item) + + background_tasks.add_task( + send_email, + "admin@example.com", + f"New item created: {created.name}" + ) + + return created +``` + +### Caching + +```python +from functools import lru_cache +from datetime import datetime, timedelta + +# In-memory cache +@lru_cache(maxsize=128) +async def get_categories() -> List[Category]: + """Get categories with caching.""" + return await fetch_categories_from_db() + +# Redis cache +async def get_item_cached(item_id: str) -> Optional[Item]: + """Get item with Redis cache.""" + # Try cache first + cached = await redis.get(f"item:{item_id}") + if cached: + return Item.parse_raw(cached) + + # Fetch from database + item = await get_item_from_db(item_id) + + # Cache for 1 hour + await redis.setex( + f"item:{item_id}", + 3600, + item.json() + ) + + return item +``` + +--- + +## Quick Reference + +### Common Commands + +```bash +# Code quality +ruff format && ruff check --fix src/ && ruff check --fix tests/ + +# Testing +pytest # Run all tests +pytest -v # Verbose +pytest -k "test_name" # Run specific test + +# Development +uvicorn app.main:app --reload # Run server with auto-reload +``` + +### File Structure Template + +``` +my-feature/ +├── my-feature.py # Entry point +├── routers/ +│ └── things.py # Endpoints +├── models/ +│ └── thing.py # Pydantic models +├── functions/ +│ └── create_thing.py # Business logic +└── services/ + └── database.py # External services +``` + +### Import Pattern + +```python +# In routers +from ..models.thing import ThingCreate +from ..functions.create_thing import create_thing_logic + +# In functions +from ..models.thing import ThingCreate +from ..services.database import save_thing +from app.shared.logger import get_logger + +# In services +from sqlalchemy import select +from app.shared.database import get_session +``` + +That's it! Follow these patterns and your code will be consistent, maintainable, and scalable. From e20fb81a3472bd407023fc085790b62fd3492e67 Mon Sep 17 00:00:00 2001 From: PhilippTheServer Date: Sat, 6 Dec 2025 16:23:36 +0100 Subject: [PATCH 16/51] refactor: remove old service structure - Remove old test_api.py - Remove generic services subdirectories - Preparing for new modular service architecture --- src/app/services/functions/__init__.py | 1 - src/app/services/models/__init__.py | 1 - src/app/services/routers/__init__.py | 1 - tests/test_api.py | 1 - 4 files changed, 4 deletions(-) delete mode 100644 src/app/services/functions/__init__.py delete mode 100644 src/app/services/models/__init__.py delete mode 100644 src/app/services/routers/__init__.py delete mode 100644 tests/test_api.py diff --git a/src/app/services/functions/__init__.py b/src/app/services/functions/__init__.py deleted file mode 100644 index 2a46d1c..0000000 --- a/src/app/services/functions/__init__.py +++ /dev/null @@ -1 +0,0 @@ -# Init file for functions \ No newline at end of file diff --git a/src/app/services/models/__init__.py b/src/app/services/models/__init__.py deleted file mode 100644 index 7ccdd61..0000000 --- a/src/app/services/models/__init__.py +++ /dev/null @@ -1 +0,0 @@ -# Init file for models \ No newline at end of file diff --git a/src/app/services/routers/__init__.py b/src/app/services/routers/__init__.py deleted file mode 100644 index 9da0053..0000000 --- a/src/app/services/routers/__init__.py +++ /dev/null @@ -1 +0,0 @@ -# Init file for routers \ No newline at end of file diff --git a/tests/test_api.py b/tests/test_api.py deleted file mode 100644 index 4e7c815..0000000 --- a/tests/test_api.py +++ /dev/null @@ -1 +0,0 @@ -# Test cases for the FastAPI project \ No newline at end of file From 2571f86528cebcb28ed0c81314b78fa77f8757d6 Mon Sep 17 00:00:00 2001 From: PhilippTheServer Date: Sat, 6 Dec 2025 16:23:47 +0100 Subject: [PATCH 17/51] feat(crud-item-store): add item store service scaffold - Add service structure with routers, models, functions - Follows new modular architecture pattern --- src/app/services/crud-item-store/__init__.py | 0 src/app/services/crud-item-store/functions/__init__.py | 1 + src/app/services/crud-item-store/models/__init__.py | 1 + src/app/services/crud-item-store/routers/__init__.py | 1 + 4 files changed, 3 insertions(+) create mode 100644 src/app/services/crud-item-store/__init__.py create mode 100644 src/app/services/crud-item-store/functions/__init__.py create mode 100644 src/app/services/crud-item-store/models/__init__.py create mode 100644 src/app/services/crud-item-store/routers/__init__.py diff --git a/src/app/services/crud-item-store/__init__.py b/src/app/services/crud-item-store/__init__.py new file mode 100644 index 0000000..e69de29 diff --git a/src/app/services/crud-item-store/functions/__init__.py b/src/app/services/crud-item-store/functions/__init__.py new file mode 100644 index 0000000..807cea6 --- /dev/null +++ b/src/app/services/crud-item-store/functions/__init__.py @@ -0,0 +1 @@ +# Init file for functions diff --git a/src/app/services/crud-item-store/models/__init__.py b/src/app/services/crud-item-store/models/__init__.py new file mode 100644 index 0000000..7ba8c15 --- /dev/null +++ b/src/app/services/crud-item-store/models/__init__.py @@ -0,0 +1 @@ +# Init file for models diff --git a/src/app/services/crud-item-store/routers/__init__.py b/src/app/services/crud-item-store/routers/__init__.py new file mode 100644 index 0000000..d3bf4e7 --- /dev/null +++ b/src/app/services/crud-item-store/routers/__init__.py @@ -0,0 +1 @@ +# Init file for routers From a257152bf9ca8cc00c4e33cbcaec2f1b19212721 Mon Sep 17 00:00:00 2001 From: PhilippTheServer Date: Sat, 6 Dec 2025 16:23:58 +0100 Subject: [PATCH 18/51] refactor: update main app and authorization - Update main.py for new service structure - Update Keycloak authorization module - Integrate logger system --- src/app/authorize/__init__.py | 2 +- src/app/authorize/keycloak.py | 17 +++++++---------- src/app/main.py | 2 +- 3 files changed, 9 insertions(+), 12 deletions(-) diff --git a/src/app/authorize/__init__.py b/src/app/authorize/__init__.py index d024106..87bdac0 100644 --- a/src/app/authorize/__init__.py +++ b/src/app/authorize/__init__.py @@ -1 +1 @@ -# Init file for auth \ No newline at end of file +# Init file for auth diff --git a/src/app/authorize/keycloak.py b/src/app/authorize/keycloak.py index 3935d30..dc97b98 100644 --- a/src/app/authorize/keycloak.py +++ b/src/app/authorize/keycloak.py @@ -6,10 +6,10 @@ # Setup environment variables -KEYCLOAK_URL = os.getenv('KEYCLOAK_URL', 'https://keycloak.example.com/auth/') -REALM = os.getenv('REALM', 'YourRealm') -CLIENT_ID = os.getenv('CLIENT_ID', 'your-client-id') -CLIENT_SECRET = os.getenv('CLIENT_SECRET') +KEYCLOAK_URL = os.getenv("KEYCLOAK_URL", "https://keycloak.example.com/auth/") +REALM = os.getenv("REALM", "YourRealm") +CLIENT_ID = os.getenv("CLIENT_ID", "your-client-id") +CLIENT_SECRET = os.getenv("CLIENT_SECRET") JWKS_URL = f"{KEYCLOAK_URL}realms/{REALM}/protocol/openid-connect/certs" # OAuth2 configuration @@ -20,8 +20,7 @@ async def validate_keycloak_token(user_token: str = Depends(oauth2_scheme)): - auth = OAuth2Session(client_id=CLIENT_ID, - client_secret=CLIENT_SECRET) + auth = OAuth2Session(client_id=CLIENT_ID, client_secret=CLIENT_SECRET) result = auth.introspect_token( url=f"{KEYCLOAK_URL}realms/{REALM}/protocol/openid-connect/token/introspect", token=user_token, @@ -36,11 +35,9 @@ async def validate_keycloak_token(user_token: str = Depends(oauth2_scheme)): token_info = json.loads(result.content.decode()) print(token_info) if not token_info["active"]: - raise HTTPException( - status_code=401, detail="Token is invalid or expired") + raise HTTPException(status_code=401, detail="Token is invalid or expired") roles = token_info["realm_access"].get("roles") if "IT-Admin" in roles: return token_info - raise HTTPException( - status_code=403, detail="User does not have the required role") + raise HTTPException(status_code=403, detail="User does not have the required role") diff --git a/src/app/main.py b/src/app/main.py index 0711213..1abd1da 100644 --- a/src/app/main.py +++ b/src/app/main.py @@ -3,7 +3,6 @@ import logging -from routers.name import endpoint app = FastAPI(title="Dev API") @@ -31,4 +30,5 @@ if __name__ == "__main__": import uvicorn + uvicorn.run(app, host="0.0.0.0", port=8000) From ab580f3c49a0017df8ab3389ab81fdaea116ac59 Mon Sep 17 00:00:00 2001 From: PhilippTheServer Date: Sun, 7 Dec 2025 09:48:09 +0100 Subject: [PATCH 19/51] build(docker): refactor build process for less build time/size --- src/Dockerfile | 66 +++++++++++++++++++++++++++++++++++++++++++++----- 1 file changed, 60 insertions(+), 6 deletions(-) diff --git a/src/Dockerfile b/src/Dockerfile index 8935543..154fa52 100644 --- a/src/Dockerfile +++ b/src/Dockerfile @@ -1,10 +1,64 @@ -FROM python:3.11-slim +############################################ +# 1) uv installer stage +############################################ +FROM python:3.12-slim AS uv-base -WORKDIR /app +ENV PYTHONDONTWRITEBYTECODE=1 \ + PYTHONUNBUFFERED=1 \ + UV_LINK_MODE=copy \ + UV_INSTALL_DIR=/usr/local/bin -COPY ./app/requirements.txt /app/requirements.txt -RUN pip install --no-cache-dir -r /app/requirements.txt +RUN apt-get update \ + && apt-get install -y --no-install-recommends curl ca-certificates \ + && rm -rf /var/lib/apt/lists/* \ + && curl -LsSf https://astral.sh/uv/install.sh | sh -COPY ./app /app +############################################ +# 2) deps stage: build a self-contained venv +############################################ +FROM python:3.12-slim AS deps -CMD ["uvicorn", "main:app", "--host", "0.0.0.0", "--port", "8000"] +# Bring uv from the previous stage +COPY --from=uv-base /usr/local/bin/uv /usr/local/bin/uv + +# Create a dedicated virtualenv for runtime deps +RUN python -m venv /opt/venv +ENV PATH="/opt/venv/bin:${PATH}" + +WORKDIR /build + +# Copy dependency manifest to leverage Docker layer cache +# Note: build context is project root, so pyproject.toml is at root level +COPY pyproject.toml /build/ + +# Install deps into the venv using uv (supports pyproject.toml directly) +RUN uv pip install --python /opt/venv/bin/python --no-cache -r pyproject.toml + +############################################ +# 3) final stage: copy venv + app code +############################################ +FROM python:3.12-slim AS runtime + +# Copy the prebuilt venv from the deps stage +COPY --from=deps /opt/venv /opt/venv +ENV PATH="/opt/venv/bin:${PATH}" + +RUN apt-get update \ + && apt-get install -y --no-install-recommends wireguard-tools \ + && rm -rf /var/lib/apt/lists/* + +WORKDIR /code + +# Copy the application code +# Note: build context is project root, so app is at src/app/ +# We copy it as 'app' so Python imports work correctly (from app.services...) +COPY src/app /code/app + +# Optional: run as non-root +# RUN useradd -m appuser && chown -R appuser:appuser /code +# USER appuser + +EXPOSE 8000 + +# The app module is now at /code/app/, so uvicorn can find app.main:app +CMD ["uvicorn", "app.main:app", "--host", "0.0.0.0", "--port", "8000"] \ No newline at end of file From aaaede8ee658038b06b35c9cb3cbfde2c6d2497c Mon Sep 17 00:00:00 2001 From: PhilippTheServer Date: Sun, 7 Dec 2025 09:51:46 +0100 Subject: [PATCH 20/51] dist: update dependencys to latest --- pyproject.toml | 4 ++-- uv.lock | 40 +++++++++++++++------------------------- 2 files changed, 17 insertions(+), 27 deletions(-) diff --git a/pyproject.toml b/pyproject.toml index 91ac761..e45123b 100644 --- a/pyproject.toml +++ b/pyproject.toml @@ -7,8 +7,8 @@ requires-python = ">=3.12" dependencies = [ "authlib>=1.6.5", "cryptography>=46.0.3", - 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Docker secret: /run/secrets/{secret_name} + 2. Kubernetes secret: /var/run/secrets/{secret_name} + 3. Environment variable: {SECRET_NAME} + 4. Default value + + Args: + secret_name: Name of the secret (e.g., "database_password") + default: Default value if secret not found + + Returns: + Secret value or default + + Example: + >>> db_password = load_secret("database_password", "default_pwd") + """ + # Try Docker secrets + docker_secret_path = Path(f"/run/secrets/{secret_name}") + if docker_secret_path.exists(): + return docker_secret_path.read_text().strip() + + # Try Kubernetes secrets + k8s_secret_path = Path(f"/var/run/secrets/{secret_name}") + if k8s_secret_path.exists(): + return k8s_secret_path.read_text().strip() + + # Try environment variable (uppercase with underscores) + env_var = secret_name.upper().replace("-", "_") + env_value = os.getenv(env_var) + if env_value is not None: + return env_value + + # Return default + return default + + +def load_secret_or_raise(secret_name: str) -> str: + """ + Load a secret or raise an error if not found. + + Args: + secret_name: Name of the secret + + Returns: + Secret value + + Raises: + ValueError: If secret not found + + Example: + >>> api_key = load_secret_or_raise("api_key") + """ + secret = load_secret(secret_name) + if secret is None: + raise ValueError( + f"Secret '{secret_name}' not found. " + f"Check /run/secrets/, /var/run/secrets/, or environment variables." + ) + return secret + + +def secrets_available() -> bool: + """ + Check if any secrets directory is available. + + Returns: + True if Docker or K8s secrets directory exists + + Example: + >>> if secrets_available(): + ... password = load_secret("db_password") + """ + return Path("/run/secrets").exists() or Path("/var/run/secrets").exists() From d9f76a1641842784c69dfb850457d294523502d0 Mon Sep 17 00:00:00 2001 From: PhilippTheServer Date: Sun, 7 Dec 2025 10:11:08 +0100 Subject: [PATCH 24/51] feat(config): add Settings class with environment-based configuration - Database, Redis, Keycloak settings - CORS, logging, cache configuration - Rate limiting and feature flags - Auto-loads from .env, Docker secrets, K8s secrets - Validates SECRET_KEY in production --- src/app/shared/config/settings.py | 203 ++++++++++++++++++++++++++++++ 1 file changed, 203 insertions(+) create mode 100644 src/app/shared/config/settings.py diff --git a/src/app/shared/config/settings.py b/src/app/shared/config/settings.py new file mode 100644 index 0000000..1112bcc --- /dev/null +++ b/src/app/shared/config/settings.py @@ -0,0 +1,203 @@ +""" +Application Settings + +Environment-based configuration with support for: +- .env files +- Docker secrets +- Kubernetes secrets +- Environment variables +""" + +from typing import Any + +from pydantic import Field, field_validator +from pydantic_settings import BaseSettings, SettingsConfigDict + +from app.shared.config.enums import Environment +from app.shared.config.loader import load_secret + + +class Settings(BaseSettings): + """ + Application settings. + + Loads configuration from (in order of priority): + 1. Docker/K8s secrets + 2. Environment variables + 3. .env file + 4. Default values + + Example: + >>> settings = Settings() + >>> print(settings.database_url) + """ + + model_config = SettingsConfigDict( + env_file=".env", + env_file_encoding="utf-8", + case_sensitive=False, + extra="ignore", + ) + + # Application + app_name: str = Field(default="OpenTaberna API", description="Application name") + app_version: str = Field(default="0.1.0", description="Application version") + environment: Environment = Field( + default=Environment.DEVELOPMENT, description="Application environment" + ) + debug: bool = Field(default=False, description="Debug mode") + secret_key: str = Field( + default="CHANGE_ME_IN_PRODUCTION", description="Secret key for JWT/sessions" + ) + + # Server + host: str = Field(default="0.0.0.0", description="Server host") + port: int = Field(default=8000, description="Server port") + workers: int = Field(default=1, description="Number of worker processes") + reload: bool = Field(default=False, description="Auto-reload on code changes") + + # Database + database_url: str = Field( + default="postgresql+asyncpg://opentaberna:opentaberna@localhost:5432/opentaberna", + description="Database connection URL", + ) + database_pool_size: int = Field(default=20, description="Database pool size") + database_max_overflow: int = Field( + default=40, description="Database pool max overflow" + ) + database_pool_timeout: int = Field( + default=30, description="Database pool timeout in seconds" + ) + database_echo: bool = Field( + default=False, description="Echo SQL queries (for debugging)" + ) + + # Redis + redis_url: str = Field( + default="redis://localhost:6379/0", description="Redis connection URL" + ) + redis_password: str | None = Field(default=None, description="Redis password") + + # Keycloak + keycloak_url: str = Field( + default="http://localhost:8080", description="Keycloak server URL" + ) + keycloak_realm: str = Field( + default="opentaberna", description="Keycloak realm name" + ) + keycloak_client_id: str = Field( + default="opentaberna-api", description="Keycloak client ID" + ) + keycloak_client_secret: str = Field( + default="", description="Keycloak client secret" + ) + + # CORS + cors_origins: list[str] = Field(default=["*"], description="Allowed CORS origins") + cors_credentials: bool = Field( + default=True, description="Allow credentials in CORS" + ) + + # Logging + log_level: str = Field(default="INFO", description="Logging level") + log_format: str = Field( + default="console", description="Log format: console or json" + ) + log_file: str | None = Field(default=None, description="Log file path") + + # Cache + cache_enabled: bool = Field(default=True, description="Enable caching") + cache_ttl: int = Field(default=300, description="Default cache TTL in seconds") + + # Rate Limiting + rate_limit_enabled: bool = Field(default=True, description="Enable rate limiting") + rate_limit_per_minute: int = Field( + default=60, description="Rate limit requests per minute" + ) + + # Feature Flags + feature_webhooks_enabled: bool = Field(default=False, description="Enable webhooks") + + @field_validator("secret_key") + @classmethod + def validate_secret_key(cls, v: str, info: Any) -> str: + """Ensure secret key is changed in production.""" + env = info.data.get("environment", Environment.DEVELOPMENT) + if env == Environment.PRODUCTION and v == "CHANGE_ME_IN_PRODUCTION": + raise ValueError("SECRET_KEY must be changed in production!") + return v + + @field_validator("database_url", mode="before") + @classmethod + def load_database_url(cls, v: str | None) -> str: + """Load database URL from secrets if available.""" + if v: + return v + return load_secret("database_url") or v or "" + + @field_validator("redis_password", mode="before") + @classmethod + def load_redis_password(cls, v: str | None) -> str | None: + """Load Redis password from secrets if available.""" + if v: + return v + return load_secret("redis_password") + + @field_validator("keycloak_client_secret", mode="before") + @classmethod + def load_keycloak_secret(cls, v: str | None) -> str: + """Load Keycloak client secret from secrets if available.""" + if v: + return v + return load_secret("keycloak_client_secret") or v or "" + + def model_post_init(self, __context: Any) -> None: + """Post-initialization processing.""" + # Auto-enable debug in development + if self.environment.is_development(): + self.debug = True + self.reload = True + + # Ensure security in production + if self.environment.is_production(): + self.debug = False + self.reload = False + self.database_echo = False + + @property + def is_production(self) -> bool: + """Check if running in production.""" + return self.environment.is_production() + + @property + def is_testing(self) -> bool: + """Check if running in testing mode.""" + return self.environment.is_testing() + + @property + def is_development(self) -> bool: + """Check if running in development mode.""" + return self.environment.is_development() + + def get_database_url(self, hide_password: bool = False) -> str: + """ + Get database URL, optionally hiding password. + + Args: + hide_password: If True, replace password with *** + + Returns: + Database URL string + """ + if not hide_password: + return self.database_url + + # Simple password hiding + if "@" in self.database_url: + protocol, rest = self.database_url.split("://", 1) + if "@" in rest: + creds, host = rest.split("@", 1) + if ":" in creds: + user = creds.split(":")[0] + return f"{protocol}://{user}:***@{host}" + return self.database_url From a833ca0adfcaa227a4f6bd868cf3c03cacc6fd9b Mon Sep 17 00:00:00 2001 From: PhilippTheServer Date: Sun, 7 Dec 2025 10:11:31 +0100 Subject: [PATCH 25/51] feat(config): add get_settings() singleton factory --- src/app/shared/config/factory.py | 38 ++++++++++++++++++++++++++++++++ 1 file changed, 38 insertions(+) create mode 100644 src/app/shared/config/factory.py diff --git a/src/app/shared/config/factory.py b/src/app/shared/config/factory.py new file mode 100644 index 0000000..d22f77a --- /dev/null +++ b/src/app/shared/config/factory.py @@ -0,0 +1,38 @@ +""" +Configuration Factory + +Provides singleton access to application settings. +""" + +from functools import lru_cache + +from app.shared.config.settings import Settings + + +@lru_cache +def get_settings() -> Settings: + """ + Get application settings (cached singleton). + + Returns: + Settings instance + + Example: + >>> from app.shared.config import get_settings + >>> settings = get_settings() + >>> print(settings.database_url) + """ + return Settings() + + +def clear_settings_cache() -> None: + """ + Clear the settings cache. + + Useful for testing or reloading configuration. + + Example: + >>> clear_settings_cache() + >>> settings = get_settings() # Loads fresh settings + """ + get_settings.cache_clear() From ce6938e3486eae863b90df2e2b00b4773c0886ef Mon Sep 17 00:00:00 2001 From: PhilippTheServer Date: Sun, 7 Dec 2025 10:11:52 +0100 Subject: [PATCH 26/51] feat(config): add module public API exports --- src/app/shared/config/__init__.py | 25 +++++++++++++++++++++++++ 1 file changed, 25 insertions(+) create mode 100644 src/app/shared/config/__init__.py diff --git a/src/app/shared/config/__init__.py b/src/app/shared/config/__init__.py new file mode 100644 index 0000000..47f4956 --- /dev/null +++ b/src/app/shared/config/__init__.py @@ -0,0 +1,25 @@ +""" +Configuration Module + +Provides environment-based configuration management with support for: +- .env files +- Docker secrets (/run/secrets/*) +- Kubernetes secrets (mounted as files) +- Environment variables + +Usage: + from app.shared.config import get_settings + + settings = get_settings() + print(settings.database_url) +""" + +from app.shared.config.enums import Environment +from app.shared.config.factory import get_settings +from app.shared.config.settings import Settings + +__all__ = [ + "Environment", + "Settings", + "get_settings", +] From e909255f27cac28271a9c7d34f83f005ded6ee44 Mon Sep 17 00:00:00 2001 From: PhilippTheServer Date: Sun, 7 Dec 2025 10:12:17 +0100 Subject: [PATCH 27/51] chore: add .env.example template and update .gitignore --- .env.example | 99 ++++++++++++++++++++++++++++++++++++++++++++++++++++ .gitignore | 2 ++ 2 files changed, 101 insertions(+) create mode 100644 .env.example diff --git a/.env.example b/.env.example new file mode 100644 index 0000000..220a084 --- /dev/null +++ b/.env.example @@ -0,0 +1,99 @@ +# ================================== +# OpenTaberna API - Environment Configuration +# ================================== +# +# Copy this file to .env and customize for your environment +# Never commit .env files to version control! + +# ---------------------------------- +# Application +# ---------------------------------- +APP_NAME=OpenTaberna API +APP_VERSION=0.1.0 +ENVIRONMENT=development +DEBUG=false +SECRET_KEY=CHANGE_ME_IN_PRODUCTION + +# ---------------------------------- +# Server +# ---------------------------------- +HOST=0.0.0.0 +PORT=8000 +WORKERS=1 +RELOAD=false + +# ---------------------------------- +# Database +# ---------------------------------- +# PostgreSQL connection URL +# Format: postgresql+asyncpg://user:password@host:port/database +DATABASE_URL=postgresql+asyncpg://opentaberna:opentaberna@localhost:5432/opentaberna + +# Connection pool settings +DATABASE_POOL_SIZE=20 +DATABASE_MAX_OVERFLOW=40 +DATABASE_POOL_TIMEOUT=30 +DATABASE_ECHO=false + +# ---------------------------------- +# Redis +# ---------------------------------- +REDIS_URL=redis://localhost:6379/0 +# REDIS_PASSWORD= # Load from Docker/K8s secret in production + +# ---------------------------------- +# Keycloak +# ---------------------------------- +KEYCLOAK_URL=http://localhost:8080 +KEYCLOAK_REALM=opentaberna +KEYCLOAK_CLIENT_ID=opentaberna-api +# KEYCLOAK_CLIENT_SECRET= # Load from Docker/K8s secret in production + +# ---------------------------------- +# CORS +# ---------------------------------- +# Comma-separated list of allowed origins +# Use ["*"] for development, specific domains in production +CORS_ORIGINS=["*"] +CORS_CREDENTIALS=true + +# ---------------------------------- +# Logging +# ---------------------------------- +LOG_LEVEL=INFO +LOG_FORMAT=console +# LOG_FILE=/var/log/opentaberna/app.log + +# ---------------------------------- +# Cache +# ---------------------------------- +CACHE_ENABLED=true +CACHE_TTL=300 + +# ---------------------------------- +# Rate Limiting +# ---------------------------------- +RATE_LIMIT_ENABLED=true +RATE_LIMIT_PER_MINUTE=60 + +# ---------------------------------- +# Feature Flags +# ---------------------------------- +FEATURE_WEBHOOKS_ENABLED=false + +# ================================== +# Notes: +# ================================== +# +# Sensitive values (passwords, secrets) should be loaded from: +# - Docker secrets: /run/secrets/ +# - Kubernetes secrets: /var/run/secrets/ +# - Environment variables (uppercase with underscores) +# +# Example production setup: +# - Store DATABASE_URL in /run/secrets/database_url +# - Store REDIS_PASSWORD in /run/secrets/redis_password +# - Store KEYCLOAK_CLIENT_SECRET in /run/secrets/keycloak_client_secret +# +# Generate secure SECRET_KEY: +# python -c "import secrets; print(secrets.token_urlsafe(32))" diff --git a/.gitignore b/.gitignore index 02e6f37..9208e45 100644 --- a/.gitignore +++ b/.gitignore @@ -140,3 +140,5 @@ cython_debug/ # PyCharm # .idea/ + +.env.test \ No newline at end of file From 2da1d3e623c6c2b875838a4c962b3d979a441327 Mon Sep 17 00:00:00 2001 From: PhilippTheServer Date: Sun, 7 Dec 2025 10:12:37 +0100 Subject: [PATCH 28/51] test(config): add comprehensive test suite (35 tests) --- tests/test_config.py | 347 +++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 347 insertions(+) create mode 100644 tests/test_config.py diff --git a/tests/test_config.py b/tests/test_config.py new file mode 100644 index 0000000..c744ba6 --- /dev/null +++ b/tests/test_config.py @@ -0,0 +1,347 @@ +""" +Configuration Module Tests + +Tests for environment-based configuration with secrets support. +""" + + +import pytest + +from app.shared.config import Environment, Settings, get_settings +from app.shared.config.factory import clear_settings_cache +from app.shared.config.loader import load_secret, secrets_available + + +class TestEnvironmentEnum: + """Test Environment enum.""" + + def test_environment_values(self): + """Test environment enum values.""" + assert Environment.DEVELOPMENT.value == "development" + assert Environment.TESTING.value == "testing" + assert Environment.STAGING.value == "staging" + assert Environment.PRODUCTION.value == "production" + + def test_is_production(self): + """Test is_production method.""" + assert Environment.PRODUCTION.is_production() + assert not Environment.DEVELOPMENT.is_production() + assert not Environment.TESTING.is_production() + + def test_is_testing(self): + """Test is_testing method.""" + assert Environment.TESTING.is_testing() + assert not Environment.PRODUCTION.is_testing() + + def test_is_development(self): + """Test is_development method.""" + assert Environment.DEVELOPMENT.is_development() + assert not Environment.PRODUCTION.is_development() + + +class TestSecretLoader: + """Test secret loading from various sources.""" + + def test_load_secret_from_env(self, monkeypatch): + """Test loading secret from environment variable.""" + monkeypatch.setenv("TEST_SECRET", "secret-value") + + result = load_secret("test_secret") + assert result == "secret-value" + + def test_load_secret_with_default(self): + """Test loading secret with default value.""" + result = load_secret("nonexistent_secret", default="default-value") + assert result == "default-value" + + def test_load_secret_not_found(self): + """Test loading nonexistent secret returns None.""" + result = load_secret("definitely_does_not_exist") + assert result is None + + def test_secrets_available(self): + """Test checking if secrets directories exist.""" + # In test environment, secrets usually not available + available = secrets_available() + assert isinstance(available, bool) + + +class TestSettings: + """Test Settings class.""" + + def test_default_settings(self): + """Test default settings values.""" + settings = Settings() + + assert settings.app_name == "OpenTaberna API" + assert settings.app_version == "0.1.0" + assert settings.environment in [ + Environment.DEVELOPMENT, + Environment.TESTING, + ] + assert settings.host == "0.0.0.0" + assert settings.port == 8000 + + def test_custom_settings_from_env(self, monkeypatch): + """Test loading custom settings from environment.""" + monkeypatch.setenv("APP_NAME", "Custom API") + monkeypatch.setenv("PORT", "9000") + monkeypatch.setenv("DEBUG", "true") + + settings = Settings() + + assert settings.app_name == "Custom API" + assert settings.port == 9000 + assert settings.debug is True + + def test_environment_from_env(self, monkeypatch): + """Test setting environment from env var.""" + monkeypatch.setenv("ENVIRONMENT", "production") + monkeypatch.setenv("SECRET_KEY", "production-secret-key") + + settings = Settings() + + assert settings.environment == Environment.PRODUCTION + assert settings.is_production + + def test_database_settings(self): + """Test database configuration.""" + settings = Settings() + + assert "postgresql" in settings.database_url.lower() + assert settings.database_pool_size == 20 + assert settings.database_max_overflow == 40 + assert settings.database_pool_timeout == 30 + + def test_redis_settings(self): + """Test Redis configuration.""" + settings = Settings() + + assert "redis" in settings.redis_url.lower() + assert settings.redis_password is None # No secret in tests + + def test_keycloak_settings(self): + """Test Keycloak configuration.""" + settings = Settings() + + assert "localhost" in settings.keycloak_url + assert settings.keycloak_realm == "opentaberna" + assert settings.keycloak_client_id == "opentaberna-api" + + def test_cors_settings(self): + """Test CORS configuration.""" + settings = Settings() + + assert isinstance(settings.cors_origins, list) + assert settings.cors_credentials is True + + def test_logging_settings(self): + """Test logging configuration.""" + settings = Settings() + + assert settings.log_level == "INFO" + assert settings.log_format in ["console", "json"] + + def test_cache_settings(self): + """Test cache configuration.""" + settings = Settings() + + assert isinstance(settings.cache_enabled, bool) + assert settings.cache_ttl > 0 + + def test_feature_flags(self): + """Test feature flags.""" + settings = Settings() + + assert isinstance(settings.feature_webhooks_enabled, bool) + + +class TestSettingsValidation: + """Test settings validation.""" + + def test_secret_key_required_in_production(self, monkeypatch): + """Test SECRET_KEY validation in production.""" + monkeypatch.setenv("ENVIRONMENT", "production") + + with pytest.raises(ValueError, match="SECRET_KEY must be changed"): + Settings() + + def test_secret_key_ok_in_production(self, monkeypatch): + """Test SECRET_KEY accepts custom value in production.""" + monkeypatch.setenv("ENVIRONMENT", "production") + monkeypatch.setenv("SECRET_KEY", "custom-secure-key-123") + + settings = Settings() + assert settings.secret_key == "custom-secure-key-123" + + def test_secret_key_default_ok_in_development(self): + """Test default SECRET_KEY allowed in development.""" + settings = Settings() + + # Should not raise even with default secret key + assert settings.secret_key is not None + + +class TestSettingsProperties: + """Test Settings helper properties and methods.""" + + def test_is_production_property(self, monkeypatch): + """Test is_production property.""" + monkeypatch.setenv("ENVIRONMENT", "production") + monkeypatch.setenv("SECRET_KEY", "prod-key") + + settings = Settings() + assert settings.is_production is True + + def test_is_testing_property(self, monkeypatch): + """Test is_testing property.""" + monkeypatch.setenv("ENVIRONMENT", "testing") + + settings = Settings() + assert settings.is_testing is True + + def test_is_development_property(self, monkeypatch): + """Test is_development property.""" + monkeypatch.setenv("ENVIRONMENT", "development") + + settings = Settings() + assert settings.is_development is True + + def test_get_database_url_with_password(self): + """Test getting database URL with password visible.""" + settings = Settings() + + url = settings.get_database_url(hide_password=False) + assert "postgresql" in url.lower() + + def test_get_database_url_hidden_password(self): + """Test getting database URL with hidden password.""" + settings = Settings() + + url = settings.get_database_url(hide_password=True) + assert "***" in url or "@" not in url # Password hidden or no password + + +class TestSettingsPostInit: + """Test post-initialization settings modifications.""" + + def test_debug_enabled_in_development(self, monkeypatch): + """Test debug auto-enabled in development.""" + monkeypatch.setenv("ENVIRONMENT", "development") + + settings = Settings() + + assert settings.debug is True + assert settings.reload is True + + def test_debug_disabled_in_production(self, monkeypatch): + """Test debug disabled in production.""" + monkeypatch.setenv("ENVIRONMENT", "production") + monkeypatch.setenv("SECRET_KEY", "prod-key") + + settings = Settings() + + assert settings.debug is False + assert settings.reload is False + assert settings.database_echo is False + + +class TestGetSettings: + """Test get_settings factory function.""" + + def test_get_settings_singleton(self): + """Test get_settings returns cached singleton.""" + clear_settings_cache() + + settings1 = get_settings() + settings2 = get_settings() + + assert settings1 is settings2 # Same instance + + def test_clear_settings_cache(self, monkeypatch): + """Test clearing settings cache.""" + clear_settings_cache() + + # Get settings with custom env + monkeypatch.setenv("APP_NAME", "First Name") + settings1 = get_settings() + assert settings1.app_name == "First Name" + + # Clear cache and change env + clear_settings_cache() + monkeypatch.setenv("APP_NAME", "Second Name") + settings2 = get_settings() + + assert settings2.app_name == "Second Name" + assert settings1 is not settings2 # Different instances + + def test_get_settings_with_env_file(self, tmp_path, monkeypatch): + """Test loading settings from .env file.""" + # Create temporary .env file + env_file = tmp_path / ".env" + env_file.write_text("APP_NAME=Test App\nPORT=7000\nDEBUG=true\n") + + # Change to temp directory + monkeypatch.chdir(tmp_path) + clear_settings_cache() + + settings = get_settings() + + assert settings.app_name == "Test App" + assert settings.port == 7000 + + +class TestEnvironmentVariablePriority: + """Test priority of different configuration sources.""" + + def test_env_var_overrides_default(self, monkeypatch): + """Test environment variable overrides default.""" + monkeypatch.setenv("PORT", "5000") + clear_settings_cache() + + settings = get_settings() + assert settings.port == 5000 + + def test_case_insensitive_env_vars(self, monkeypatch): + """Test case-insensitive environment variables.""" + monkeypatch.setenv("app_name", "Lower Case App") + clear_settings_cache() + + settings = get_settings() + assert settings.app_name == "Lower Case App" + + +class TestSettingsIntegration: + """Integration tests for full settings usage.""" + + def test_complete_configuration(self, monkeypatch): + """Test loading complete configuration.""" + monkeypatch.setenv("ENVIRONMENT", "staging") + monkeypatch.setenv("APP_NAME", "Staging API") + monkeypatch.setenv("DATABASE_URL", "postgresql://staging-db/db") + monkeypatch.setenv("REDIS_URL", "redis://staging-redis:6379/0") + monkeypatch.setenv("LOG_LEVEL", "WARNING") + clear_settings_cache() + + settings = get_settings() + + assert settings.environment == Environment.STAGING + assert settings.app_name == "Staging API" + assert "staging-db" in settings.database_url + assert "staging-redis" in settings.redis_url + assert settings.log_level == "WARNING" + + def test_production_configuration(self, monkeypatch): + """Test production-specific configuration.""" + monkeypatch.setenv("ENVIRONMENT", "production") + monkeypatch.setenv("SECRET_KEY", "super-secure-production-key") + monkeypatch.setenv("DATABASE_POOL_SIZE", "50") + monkeypatch.setenv("CORS_ORIGINS", '["https://example.com"]') + clear_settings_cache() + + settings = get_settings() + + assert settings.is_production + assert settings.debug is False + assert settings.reload is False + assert settings.database_pool_size == 50 From 281f92b7ee71e4364f69102c67fbb86498b0cfc3 Mon Sep 17 00:00:00 2001 From: PhilippTheServer Date: Sun, 7 Dec 2025 10:12:57 +0100 Subject: [PATCH 29/51] docs(config): add comprehensive configuration guide --- docs/config.md | 569 +++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 569 insertions(+) create mode 100644 docs/config.md diff --git a/docs/config.md b/docs/config.md new file mode 100644 index 0000000..f884c56 --- /dev/null +++ b/docs/config.md @@ -0,0 +1,569 @@ +# Configuration Module + +## Overview + +The configuration module provides **environment-based configuration management** with support for multiple secret sources: + +- **Environment Variables** - Standard `.env` files +- **Docker Secrets** - Files in `/run/secrets/` +- **Kubernetes Secrets** - Files in `/var/run/secrets/` +- **Default Values** - Built-in defaults + +## Table of Contents + +- [Quick Start](#quick-start) +- [Module Structure](#module-structure) +- [Configuration Sources](#configuration-sources) +- [Available Settings](#available-settings) +- [Usage Examples](#usage-examples) +- [Secret Loading](#secret-loading) +- [Environment-Specific Config](#environment-specific-config) +- [Testing](#testing) +- [Best Practices](#best-practices) + +--- + +## Quick Start + +### Basic Usage + +```python +from app.shared.config import get_settings + +# Get settings (cached singleton) +settings = get_settings() + +print(settings.app_name) # "OpenTaberna API" +print(settings.database_url) # "postgresql+asyncpg://..." +print(settings.environment) # Environment.DEVELOPMENT +``` + +### With FastAPI + +```python +from fastapi import Depends +from app.shared.config import Settings, get_settings + +@app.get("/info") +def get_info(settings: Settings = Depends(get_settings)): + """Get application info.""" + return { + "name": settings.app_name, + "version": settings.app_version, + "environment": settings.environment, + } +``` + +--- + +## Module Structure + +``` +shared/config/ +├── __init__.py # Public API +├── enums.py # Environment enum +├── settings.py # Settings class +├── loader.py # Secret loader +└── factory.py # get_settings() singleton +``` + +**Components:** +- `Environment` - Enum for environments (development, testing, staging, production) +- `Settings` - Pydantic BaseSettings class with all configuration +- `load_secret()` - Load secrets from Docker/K8s/env +- `get_settings()` - Cached singleton factory + +--- + +## Configuration Sources + +Settings are loaded in **priority order**: + +1. **Docker/K8s Secrets** (highest priority) + - `/run/secrets/{secret_name}` (Docker) + - `/var/run/secrets/{secret_name}` (Kubernetes) + +2. **Environment Variables** + - `UPPERCASE_WITH_UNDERSCORES` + +3. **.env File** + - `.env` in project root + +4. **Default Values** (lowest priority) + - Built into `Settings` class + +### Example Priority + +```bash +# .env file +DATABASE_URL=postgresql://localhost/dev + +# Docker secret +echo "postgresql://prod-host/prod-db" > /run/secrets/database_url + +# Result: Uses Docker secret (higher priority) +``` + +--- + +## Available Settings + +### Application + +| Setting | Type | Default | Description | +|---------|------|---------|-------------| +| `app_name` | str | `"OpenTaberna API"` | Application name | +| `app_version` | str | `"0.1.0"` | Application version | +| `environment` | Environment | `DEVELOPMENT` | Environment (dev/test/staging/prod) | +| `debug` | bool | `False` | Debug mode | +| `secret_key` | str | ⚠️ Required | Secret key for JWT/sessions | + +### Server + +| Setting | Type | Default | Description | +|---------|------|---------|-------------| +| `host` | str | `"0.0.0.0"` | Server host | +| `port` | int | `8000` | Server port | +| `workers` | int | `1` | Number of worker processes | +| `reload` | bool | `False` | Auto-reload on changes | + +### Database + +| Setting | Type | Default | Description | +|---------|------|---------|-------------| +| `database_url` | str | `postgresql+asyncpg://...` | Database connection URL | +| `database_pool_size` | int | `20` | Connection pool size | +| `database_max_overflow` | int | `40` | Pool max overflow | +| `database_pool_timeout` | int | `30` | Pool timeout (seconds) | +| `database_echo` | bool | `False` | Echo SQL queries | + +### Redis + +| Setting | Type | Default | Description | +|---------|------|---------|-------------| +| `redis_url` | str | `redis://localhost:6379/0` | Redis connection URL | +| `redis_password` | str\|None | `None` | Redis password (from secrets) | + +### Keycloak + +| Setting | Type | Default | Description | +|---------|------|---------|-------------| +| `keycloak_url` | str | `http://localhost:8080` | Keycloak server URL | +| `keycloak_realm` | str | `opentaberna` | Keycloak realm | +| `keycloak_client_id` | str | `opentaberna-api` | Client ID | +| `keycloak_client_secret` | str | Empty | Client secret (from secrets) | + +### CORS + +| Setting | Type | Default | Description | +|---------|------|---------|-------------| +| `cors_origins` | list[str] | `["*"]` | Allowed CORS origins | +| `cors_credentials` | bool | `True` | Allow credentials | + +### Logging + +| Setting | Type | Default | Description | +|---------|------|---------|-------------| +| `log_level` | str | `"INFO"` | Log level | +| `log_format` | str | `"console"` | Format (console/json) | +| `log_file` | str\|None | `None` | Log file path | + +### Feature Flags + +| Setting | Type | Default | Description | +|---------|------|---------|-------------| +| `feature_webhooks_enabled` | bool | `False` | Enable webhooks | + +--- + +## Usage Examples + +### Basic Configuration + +```python +from app.shared.config import get_settings + +settings = get_settings() + +# Database +print(settings.database_url) +print(settings.database_pool_size) + +# Check environment +if settings.is_production: + print("Running in production!") + +# Hide password in logs +safe_url = settings.get_database_url(hide_password=True) +print(safe_url) # postgresql://user:***@host/db +``` + +### Environment-Based Logic + +```python +from app.shared.config import get_settings, Environment + +settings = get_settings() + +if settings.environment == Environment.PRODUCTION: + # Production-specific logic + enable_monitoring() +elif settings.environment.is_development(): + # Development-specific logic + enable_debug_toolbar() +``` + +### FastAPI Dependency + +```python +from fastapi import FastAPI, Depends +from app.shared.config import Settings, get_settings + +app = FastAPI() + +@app.get("/health") +def health_check(settings: Settings = Depends(get_settings)): + """Health check endpoint.""" + return { + "status": "healthy", + "environment": settings.environment, + "version": settings.app_version, + } +``` + +### Feature Flags + +```python +from app.shared.config import get_settings + +settings = get_settings() + +@app.post("/register") +def register_user(user: UserCreate): + """Register new user.""" + if not settings.feature_registration_enabled: + raise HTTPException( + status_code=403, + detail="Registration is currently disabled" + ) + + # Registration logic... +``` + +--- + +## Secret Loading + +### Docker Secrets + +Create secrets: + +```bash +# Create secret file +echo "my-secret-password" | docker secret create db_password - + +# Use in docker-compose.yml +services: + api: + secrets: + - database_url + - redis_password + +secrets: + database_url: + file: ./secrets/database_url.txt + redis_password: + external: true +``` + +Settings automatically loads from `/run/secrets/database_url`. + +### Kubernetes Secrets + +Create secret: + +```bash +kubectl create secret generic opentaberna-secrets \ + --from-literal=database_url='postgresql://...' \ + --from-literal=redis_password='secret123' +``` + +Mount in deployment: + +```yaml +apiVersion: v1 +kind: Pod +spec: + containers: + - name: api + volumeMounts: + - name: secrets + mountPath: /var/run/secrets + readOnly: true + volumes: + - name: secrets + secret: + secretName: opentaberna-secrets +``` + +### Manual Secret Loading + +```python +from app.shared.config.loader import load_secret, load_secret_or_raise + +# Load with default +api_key = load_secret("api_key", default="dev-key") + +# Load or raise error +db_password = load_secret_or_raise("database_password") + +# Check if secrets available +from app.shared.config.loader import secrets_available + +if secrets_available(): + print("Running with Docker/K8s secrets") +``` + +--- + +## Environment-Specific Config + +### Development (.env.development) + +```bash +ENVIRONMENT=development +DEBUG=true +RELOAD=true + +DATABASE_URL=postgresql+asyncpg://dev:dev@localhost:5432/opentaberna_dev +REDIS_URL=redis://localhost:6379/0 + +LOG_LEVEL=DEBUG +LOG_FORMAT=console +``` + +### Production (.env.production) + +```bash +ENVIRONMENT=production +DEBUG=false +SECRET_KEY= + +# Use Docker/K8s secrets for sensitive data +# DATABASE_URL loaded from /run/secrets/database_url +# REDIS_PASSWORD loaded from /run/secrets/redis_password + +LOG_LEVEL=INFO +LOG_FORMAT=json + +CORS_ORIGINS=["https://yourdomain.com"] +``` + +### Load Specific .env File + +```bash +# Development +export ENV_FILE=.env.development +python -m uvicorn app.main:app + +# Production +export ENV_FILE=.env.production +python -m uvicorn app.main:app +``` + +--- + +## Testing + +### Test with Custom Settings + +```python +import pytest +from app.shared.config import get_settings, clear_settings_cache, Settings + +def test_settings(): + """Test settings loading.""" + settings = get_settings() + + assert settings.app_name == "OpenTaberna API" + assert settings.environment in [ + Environment.DEVELOPMENT, + Environment.TESTING, + ] + +def test_custom_settings(monkeypatch): + """Test with custom environment.""" + clear_settings_cache() + + monkeypatch.setenv("ENVIRONMENT", "production") + monkeypatch.setenv("SECRET_KEY", "test-key-123") + + settings = get_settings() + assert settings.is_production + assert not settings.debug + +def test_database_url_hiding(): + """Test password hiding in DB URL.""" + settings = get_settings() + + safe_url = settings.get_database_url(hide_password=True) + assert "***" in safe_url + assert "password" not in safe_url.lower() +``` + +### Test Environment Variables + +```python +import os +from app.shared.config import Settings + +def test_env_vars(): + """Test environment variable loading.""" + os.environ["APP_NAME"] = "Test App" + os.environ["PORT"] = "9000" + + settings = Settings() + + assert settings.app_name == "Test App" + assert settings.port == 9000 +``` + +--- + +## Best Practices + +### 1. Never Commit Secrets + +```bash +# .gitignore +.env +.env.local +.env.production +secrets/ +``` + +### 2. Use Secrets for Sensitive Data + +```python +# ❌ Bad - Hardcoded +DATABASE_URL = "postgresql://user:password@host/db" + +# ✅ Good - From secrets +settings = get_settings() +db_url = settings.database_url # Loaded from Docker/K8s secret +``` + +### 3. Validate Production Config + +```python +from app.shared.config import get_settings + +settings = get_settings() + +# Settings validates SECRET_KEY in production +# Raises ValueError if not changed +``` + +### 4. Use Environment Check + +```python +from app.shared.config import get_settings + +settings = get_settings() + +if settings.is_production: + # Production-only code + enable_monitoring() + disable_debug_mode() +``` + +### 5. Inject Settings as Dependency + +```python +# ✅ Good - Testable with FastAPI dependency override +@app.get("/items") +def get_items(settings: Settings = Depends(get_settings)): + cache_enabled = settings.cache_enabled + # ... + +# ❌ Bad - Global import, hard to test +settings = get_settings() + +@app.get("/items") +def get_items(): + cache_enabled = settings.cache_enabled +``` + +### 6. Document Environment Variables + +Create `.env.example`: + +```bash +# Application +APP_NAME=OpenTaberna API +ENVIRONMENT=development + +# Database (use Docker secret in production) +DATABASE_URL=postgresql+asyncpg://user:password@localhost:5432/db + +# Required in production +SECRET_KEY=CHANGE_ME_IN_PRODUCTION +``` + +--- + +## Troubleshooting + +### Settings Not Loading + +```python +from app.shared.config import clear_settings_cache, get_settings + +# Clear cache and reload +clear_settings_cache() +settings = get_settings() +``` + +### Secret Not Found + +```python +from app.shared.config.loader import secrets_available, load_secret + +# Check if secrets directory exists +if not secrets_available(): + print("No Docker/K8s secrets found, using env vars") + +# Debug secret loading +secret = load_secret("database_url") +if secret is None: + print("Secret not found in /run/secrets/ or env vars") +``` + +### Environment Not Detected + +```bash +# Set explicitly +export ENVIRONMENT=production + +# Check +python -c "from app.shared.config import get_settings; print(get_settings().environment)" +``` + +--- + +## Summary + +The config module provides: + +✅ **Multiple secret sources** - Docker, K8s, env vars +✅ **Type-safe settings** - Pydantic validation +✅ **Environment-based** - dev/test/staging/prod +✅ **Production-ready** - Secret validation +✅ **Testable** - Easy to mock and override +✅ **Cached singleton** - Efficient access + +**Next Steps:** +- Create `.env` file from `.env.example` +- Set `SECRET_KEY` for production +- Configure database URL +- Add feature flags as needed From b44b8ea11b265af474bc4155c2f3973b20b09498 Mon Sep 17 00:00:00 2001 From: PhilippTheServer Date: Sun, 7 Dec 2025 10:13:36 +0100 Subject: [PATCH 30/51] refactor(logger): use shared Environment enum from config - Remove duplicate Environment enum from logger - Import Environment from app.shared.config.enums - Single source of truth for environment detection --- src/app/shared/logger/__init__.py | 4 +++- src/app/shared/logger/config.py | 6 ++++-- src/app/shared/logger/enums.py | 9 --------- src/app/shared/logger/factory.py | 3 ++- src/app/shared/logger/logger.py | 4 +++- 5 files changed, 12 insertions(+), 14 deletions(-) diff --git a/src/app/shared/logger/__init__.py b/src/app/shared/logger/__init__.py index 5c2f356..3073853 100644 --- a/src/app/shared/logger/__init__.py +++ b/src/app/shared/logger/__init__.py @@ -31,7 +31,9 @@ from .config import LoggerConfig # Enums -from .enums import LogLevel, Environment +from app.shared.config.enums import Environment + +from .enums import LogLevel # Interfaces (for custom implementations) from .interfaces import ILogFormatter, ILogFilter, ILogHandler diff --git a/src/app/shared/logger/config.py b/src/app/shared/logger/config.py index 33bd535..1b69ae4 100644 --- a/src/app/shared/logger/config.py +++ b/src/app/shared/logger/config.py @@ -7,10 +7,12 @@ from pathlib import Path from typing import List, Optional -from .enums import Environment, LogLevel -from .interfaces import ILogFilter, ILogHandler +from app.shared.config.enums import Environment + +from .enums import LogLevel from .filters import SensitiveDataFilter from .handlers import ConsoleHandler, DailyRotatingFileHandler, FileHandler +from .interfaces import ILogFilter, ILogHandler class LoggerConfig: diff --git a/src/app/shared/logger/enums.py b/src/app/shared/logger/enums.py index 126f913..80eac12 100644 --- a/src/app/shared/logger/enums.py +++ b/src/app/shared/logger/enums.py @@ -13,12 +13,3 @@ class LogLevel(str, Enum): WARNING = "WARNING" ERROR = "ERROR" CRITICAL = "CRITICAL" - - -class Environment(str, Enum): - """Deployment environments.""" - - DEVELOPMENT = "development" - STAGING = "staging" - PRODUCTION = "production" - TESTING = "testing" diff --git a/src/app/shared/logger/factory.py b/src/app/shared/logger/factory.py index 86b246e..097de0d 100644 --- a/src/app/shared/logger/factory.py +++ b/src/app/shared/logger/factory.py @@ -8,8 +8,9 @@ from pathlib import Path from typing import Dict, Optional +from app.shared.config.enums import Environment + from .config import LoggerConfig -from .enums import Environment from .logger import AppLogger diff --git a/src/app/shared/logger/logger.py b/src/app/shared/logger/logger.py index b2326e7..9c44a42 100644 --- a/src/app/shared/logger/logger.py +++ b/src/app/shared/logger/logger.py @@ -9,8 +9,10 @@ import time from contextlib import contextmanager +from app.shared.config.enums import Environment + from .config import LoggerConfig -from .enums import Environment, LogLevel +from .enums import LogLevel from .filters import SensitiveDataFilter from .formatters import ConsoleFormatter, JSONFormatter from .interfaces import ILogFilter From c2bec3d94bac9865e731516675704bf114a31285 Mon Sep 17 00:00:00 2001 From: PhilippTheServer Date: Sun, 7 Dec 2025 10:13:58 +0100 Subject: [PATCH 31/51] chore(main): update imports and formatting --- src/app/main.py | 10 +--------- 1 file changed, 1 insertion(+), 9 deletions(-) diff --git a/src/app/main.py b/src/app/main.py index 1abd1da..d0066f7 100644 --- a/src/app/main.py +++ b/src/app/main.py @@ -1,16 +1,8 @@ from fastapi import FastAPI from fastapi.middleware.cors import CORSMiddleware -import logging - - -app = FastAPI(title="Dev API") - - -# Configure logging once at the entry point -logging.basicConfig(level=logging.INFO) -logger = logging.getLogger(__name__) +app = FastAPI(title="OpenTaberna API") origins = ["*"] # Consider restricting this in a production environment From 8fc2f5ccaea0fb4b0c5d242ecd595c21ff443e0b Mon Sep 17 00:00:00 2001 From: PhilippTheServer Date: Sun, 7 Dec 2025 12:57:06 +0100 Subject: [PATCH 32/51] feat(exceptions): add ErrorCode and ErrorCategory enums --- src/app/shared/exceptions/enums.py | 85 ++++++++++++++++++++++++++++++ 1 file changed, 85 insertions(+) create mode 100644 src/app/shared/exceptions/enums.py diff --git a/src/app/shared/exceptions/enums.py b/src/app/shared/exceptions/enums.py new file mode 100644 index 0000000..50737a0 --- /dev/null +++ b/src/app/shared/exceptions/enums.py @@ -0,0 +1,85 @@ +""" +Exception Enumerations + +Defines enumerations for error codes and categories. +""" + +from enum import Enum + + +class ErrorCategory(str, Enum): + """High-level error categories for classification.""" + + NOT_FOUND = "not_found" + VALIDATION = "validation" + DATABASE = "database" + AUTHENTICATION = "authentication" + AUTHORIZATION = "authorization" + BUSINESS_RULE = "business_rule" + EXTERNAL_SERVICE = "external_service" + INTERNAL = "internal" + + def is_client_error(self) -> bool: + """Check if error is caused by client (4xx).""" + return self in ( + ErrorCategory.NOT_FOUND, + ErrorCategory.VALIDATION, + ErrorCategory.AUTHENTICATION, + ErrorCategory.AUTHORIZATION, + ErrorCategory.BUSINESS_RULE, + ) + + def is_server_error(self) -> bool: + """Check if error is server-side (5xx).""" + return self in ( + ErrorCategory.DATABASE, + ErrorCategory.EXTERNAL_SERVICE, + ErrorCategory.INTERNAL, + ) + + +class ErrorCode(str, Enum): + """Specific error codes for detailed error identification.""" + + # Not Found (404) + RESOURCE_NOT_FOUND = "resource_not_found" + ENTITY_NOT_FOUND = "entity_not_found" + + # Validation (422) + INVALID_INPUT = "invalid_input" + MISSING_FIELD = "missing_field" + INVALID_FORMAT = "invalid_format" + CONSTRAINT_VIOLATION = "constraint_violation" + DUPLICATE_ENTRY = "duplicate_entry" + + # Database (500/503) + DATABASE_CONNECTION_ERROR = "database_connection_error" + DATABASE_QUERY_ERROR = "database_query_error" + DATABASE_INTEGRITY_ERROR = "database_integrity_error" + DATABASE_TIMEOUT = "database_timeout" + + # Authentication (401) + INVALID_CREDENTIALS = "invalid_credentials" + TOKEN_EXPIRED = "token_expired" + TOKEN_INVALID = "token_invalid" + AUTHENTICATION_REQUIRED = "authentication_required" + + # Authorization (403) + INSUFFICIENT_PERMISSIONS = "insufficient_permissions" + ACCESS_DENIED = "access_denied" + RESOURCE_FORBIDDEN = "resource_forbidden" + + # Business Rules (400) + BUSINESS_RULE_VIOLATION = "business_rule_violation" + INVALID_STATE = "invalid_state" + OPERATION_NOT_ALLOWED = "operation_not_allowed" + + # External Services (502/503) + EXTERNAL_SERVICE_ERROR = "external_service_error" + EXTERNAL_SERVICE_TIMEOUT = "external_service_timeout" + EXTERNAL_SERVICE_UNAVAILABLE = "external_service_unavailable" + + # Internal (500) + INTERNAL_ERROR = "internal_error" + CONFIGURATION_ERROR = "configuration_error" + UNKNOWN_ERROR = "unknown_error" From 71e7c4ae4a3586b4f411ef49a250f6ac9d231830 Mon Sep 17 00:00:00 2001 From: PhilippTheServer Date: Sun, 7 Dec 2025 12:57:18 +0100 Subject: [PATCH 33/51] feat(exceptions): add IAppException and IExceptionHandler interfaces --- src/app/shared/exceptions/interfaces.py | 87 +++++++++++++++++++++++++ 1 file changed, 87 insertions(+) create mode 100644 src/app/shared/exceptions/interfaces.py diff --git a/src/app/shared/exceptions/interfaces.py b/src/app/shared/exceptions/interfaces.py new file mode 100644 index 0000000..bdf3654 --- /dev/null +++ b/src/app/shared/exceptions/interfaces.py @@ -0,0 +1,87 @@ +""" +Interfaces (Abstract Base Classes) for the exception system. + +Following Interface Segregation Principle - focused, minimal interfaces. +""" + +from abc import ABC, abstractmethod +from typing import Any, Dict, Optional +from .enums import ErrorCategory, ErrorCode + + +class IAppException(ABC): + """ + Interface for application exceptions. + + Defines the contract that all custom exceptions must implement. + """ + + @abstractmethod + def get_message(self) -> str: + """Get the human-readable error message.""" + pass + + @abstractmethod + def get_error_code(self) -> ErrorCode: + """Get the specific error code.""" + pass + + @abstractmethod + def get_category(self) -> ErrorCategory: + """Get the error category.""" + pass + + @abstractmethod + def get_context(self) -> Dict[str, Any]: + """Get additional context data about the error.""" + pass + + @abstractmethod + def to_dict(self) -> Dict[str, Any]: + """ + Convert exception to dictionary for logging and API responses. + + Returns: + Dictionary with error details + """ + pass + + @abstractmethod + def should_log(self) -> bool: + """ + Determine if this exception should be automatically logged. + + Returns: + True if exception should be logged, False otherwise + """ + pass + + +class IExceptionHandler(ABC): + """Interface for exception handlers.""" + + @abstractmethod + def handle(self, exception: IAppException) -> Any: + """ + Handle an application exception. + + Args: + exception: The exception to handle + + Returns: + Handler-specific result (e.g., HTTP response) + """ + pass + + @abstractmethod + def can_handle(self, exception: Exception) -> bool: + """ + Check if this handler can handle the given exception. + + Args: + exception: The exception to check + + Returns: + True if handler can handle this exception + """ + pass From 829a11460cb45074a4956d44754d368d2a7f5cfe Mon Sep 17 00:00:00 2001 From: PhilippTheServer Date: Sun, 7 Dec 2025 12:57:28 +0100 Subject: [PATCH 34/51] feat(exceptions): add AppException base class with auto-logging --- src/app/shared/exceptions/base.py | 169 ++++++++++++++++++++++++++++++ 1 file changed, 169 insertions(+) create mode 100644 src/app/shared/exceptions/base.py diff --git a/src/app/shared/exceptions/base.py b/src/app/shared/exceptions/base.py new file mode 100644 index 0000000..150eaf9 --- /dev/null +++ b/src/app/shared/exceptions/base.py @@ -0,0 +1,169 @@ +""" +Base exception class for all application exceptions. + +Provides automatic logging and context management. +""" + +from typing import Any, Dict, Optional +from .interfaces import IAppException +from .enums import ErrorCategory, ErrorCode + + +class AppException(Exception, IAppException): + """ + Base class for all application exceptions. + + Implements automatic logging and provides a rich context for error handling. + All custom exceptions should inherit from this class. + + Attributes: + message: Human-readable error message + error_code: Specific error code for identification + category: Error category for classification + context: Additional context data + original_exception: Original exception if this wraps another exception + should_auto_log: Whether to automatically log this exception + """ + + def __init__( + self, + message: str, + error_code: ErrorCode, + category: ErrorCategory, + context: Optional[Dict[str, Any]] = None, + original_exception: Optional[Exception] = None, + should_auto_log: bool = True, + ): + """ + Initialize application exception. + + Args: + message: Human-readable error message + error_code: Specific error code + category: Error category + context: Additional context data (e.g., field names, entity IDs) + original_exception: Original exception if wrapping another exception + should_auto_log: Whether to automatically log this exception + """ + super().__init__(message) + self.message = message + self.error_code = error_code + self.category = category + self.context = context or {} + self.original_exception = original_exception + self.should_auto_log = should_auto_log + + # Automatic logging + if self.should_auto_log: + self._log_exception() + + def get_message(self) -> str: + """Get the human-readable error message.""" + return self.message + + def get_error_code(self) -> ErrorCode: + """Get the specific error code.""" + return self.error_code + + def get_category(self) -> ErrorCategory: + """Get the error category.""" + return self.category + + def get_context(self) -> Dict[str, Any]: + """Get additional context data about the error.""" + return self.context + + def should_log(self) -> bool: + """Determine if this exception should be automatically logged.""" + return self.should_auto_log + + def to_dict(self) -> Dict[str, Any]: + """ + Convert exception to dictionary for logging and API responses. + + Returns: + Dictionary with error details + """ + result = { + "error": { + "message": self.message, + "code": self.error_code.value, + "category": self.category.value, + } + } + + # Add context if present + if self.context: + result["error"]["context"] = self.context + + # Add original exception info if present + if self.original_exception: + result["error"]["original_error"] = { + "type": type(self.original_exception).__name__, + "message": str(self.original_exception), + } + + return result + + def _log_exception(self) -> None: + """ + Log the exception automatically using the logger module. + + Uses appropriate log level based on error category: + - Client errors (4xx): WARNING + - Server errors (5xx): ERROR + """ + try: + from app.shared.logger import get_logger + + logger = get_logger(__name__) + + # Prepare log data + log_data = { + "error_code": self.error_code.value, + "category": self.category.value, + **self.context, + } + + # Add original exception if present + if self.original_exception: + log_data["original_error"] = type(self.original_exception).__name__ + log_data["original_message"] = str(self.original_exception) + + # Log with appropriate level + if self.category.is_client_error(): + logger.warning( + self.message, + **log_data, + exc_info=self.original_exception is not None, + ) + else: + logger.error( + self.message, + **log_data, + exc_info=True, # Always include stack trace for server errors + ) + + except Exception as e: + # Fallback: Don't let logging failure break the application + # Just print to stderr + import sys + print( + f"Failed to log exception: {e}. Original error: {self.message}", + file=sys.stderr, + ) + + def __str__(self) -> str: + """String representation of the exception.""" + context_str = f", context={self.context}" if self.context else "" + return f"{self.category.value.upper()}: [{self.error_code.value}] {self.message}{context_str}" + + def __repr__(self) -> str: + """Detailed representation of the exception.""" + return ( + f"{self.__class__.__name__}(" + f"message='{self.message}', " + f"error_code={self.error_code.value}, " + f"category={self.category.value}, " + f"context={self.context})" + ) From 7a1b2d4bd1c7118046deab3822f334b898a0e833 Mon Sep 17 00:00:00 2001 From: PhilippTheServer Date: Sun, 7 Dec 2025 12:57:43 +0100 Subject: [PATCH 35/51] feat(exceptions): add 8 concrete exception classes --- src/app/shared/exceptions/errors.py | 242 ++++++++++++++++++++++++++++ 1 file changed, 242 insertions(+) create mode 100644 src/app/shared/exceptions/errors.py diff --git a/src/app/shared/exceptions/errors.py b/src/app/shared/exceptions/errors.py new file mode 100644 index 0000000..176aeda --- /dev/null +++ b/src/app/shared/exceptions/errors.py @@ -0,0 +1,242 @@ +""" +Concrete exception classes for common error scenarios. + +All exceptions follow the Open/Closed Principle - they extend AppException +without modifying it, and can be easily extended for specific use cases. +""" + +from typing import Any, Dict, Optional +from .base import AppException +from .enums import ErrorCategory, ErrorCode + + +class NotFoundError(AppException): + """ + Exception raised when a requested resource is not found. + + Examples: Database entity not found, API resource not found, File not found + HTTP Status Code: 404 + """ + + _default_message = "Resource not found" + _default_code = ErrorCode.RESOURCE_NOT_FOUND + _category = ErrorCategory.NOT_FOUND + + def __init__( + self, + message: str = None, + error_code: ErrorCode = None, + context: Optional[Dict[str, Any]] = None, + original_exception: Optional[Exception] = None, + ): + super().__init__( + message=message or self._default_message, + error_code=error_code or self._default_code, + category=self._category, + context=context, + original_exception=original_exception, + should_auto_log=True, + ) + + +class ValidationError(AppException): + """ + Exception raised when input validation fails. + + Examples: Invalid field format, Missing required field, Constraint violation + HTTP Status Code: 422 (Unprocessable Entity) + """ + + _default_message = "Validation failed" + _default_code = ErrorCode.INVALID_INPUT + _category = ErrorCategory.VALIDATION + + def __init__( + self, + message: str = None, + error_code: ErrorCode = None, + context: Optional[Dict[str, Any]] = None, + original_exception: Optional[Exception] = None, + ): + super().__init__( + message=message or self._default_message, + error_code=error_code or self._default_code, + category=self._category, + context=context, + original_exception=original_exception, + should_auto_log=True, + ) + + +class DatabaseError(AppException): + """ + Exception raised when database operations fail. + + Examples: Connection errors, Query errors, Integrity constraint violations + HTTP Status Code: 500 (Internal Server Error) or 503 (Service Unavailable) + """ + + _default_message = "Database operation failed" + _default_code = ErrorCode.DATABASE_QUERY_ERROR + _category = ErrorCategory.DATABASE + + def __init__( + self, + message: str = None, + error_code: ErrorCode = None, + context: Optional[Dict[str, Any]] = None, + original_exception: Optional[Exception] = None, + ): + super().__init__( + message=message or self._default_message, + error_code=error_code or self._default_code, + category=self._category, + context=context, + original_exception=original_exception, + should_auto_log=True, + ) + + +class AuthenticationError(AppException): + """ + Exception raised when authentication fails. + + Examples: Invalid credentials, Expired token, Invalid token + HTTP Status Code: 401 (Unauthorized) + """ + + _default_message = "Authentication failed" + _default_code = ErrorCode.INVALID_CREDENTIALS + _category = ErrorCategory.AUTHENTICATION + + def __init__( + self, + message: str = None, + error_code: ErrorCode = None, + context: Optional[Dict[str, Any]] = None, + original_exception: Optional[Exception] = None, + ): + super().__init__( + message=message or self._default_message, + error_code=error_code or self._default_code, + category=self._category, + context=context, + original_exception=original_exception, + should_auto_log=True, + ) + + +class AuthorizationError(AppException): + """ + Exception raised when authorization/permission checks fail. + + Examples: Insufficient permissions, Access denied, Role requirements not met + HTTP Status Code: 403 (Forbidden) + """ + + _default_message = "Access denied" + _default_code = ErrorCode.INSUFFICIENT_PERMISSIONS + _category = ErrorCategory.AUTHORIZATION + + def __init__( + self, + message: str = None, + error_code: ErrorCode = None, + context: Optional[Dict[str, Any]] = None, + original_exception: Optional[Exception] = None, + ): + super().__init__( + message=message or self._default_message, + error_code=error_code or self._default_code, + category=self._category, + context=context, + original_exception=original_exception, + should_auto_log=True, + ) + + +class BusinessRuleError(AppException): + """ + Exception raised when business rules are violated. + + Examples: Invalid state transition, Operation not allowed, Constraint violation + HTTP Status Code: 400 (Bad Request) + """ + + _default_message = "Business rule violation" + _default_code = ErrorCode.BUSINESS_RULE_VIOLATION + _category = ErrorCategory.BUSINESS_RULE + + def __init__( + self, + message: str = None, + error_code: ErrorCode = None, + context: Optional[Dict[str, Any]] = None, + original_exception: Optional[Exception] = None, + ): + super().__init__( + message=message or self._default_message, + error_code=error_code or self._default_code, + category=self._category, + context=context, + original_exception=original_exception, + should_auto_log=True, + ) + + +class ExternalServiceError(AppException): + """ + Exception raised when external service calls fail. + + Examples: Third-party API errors, Service timeout, Service unavailable + HTTP Status Code: 502 (Bad Gateway) or 503 (Service Unavailable) + """ + + _default_message = "External service error" + _default_code = ErrorCode.EXTERNAL_SERVICE_ERROR + _category = ErrorCategory.EXTERNAL_SERVICE + + def __init__( + self, + message: str = None, + error_code: ErrorCode = None, + context: Optional[Dict[str, Any]] = None, + original_exception: Optional[Exception] = None, + ): + super().__init__( + message=message or self._default_message, + error_code=error_code or self._default_code, + category=self._category, + context=context, + original_exception=original_exception, + should_auto_log=True, + ) + + +class InternalError(AppException): + """ + Exception raised for internal/unexpected errors. + + Examples: Configuration errors, Unexpected system errors, Programming errors + HTTP Status Code: 500 (Internal Server Error) + """ + + _default_message = "Internal error occurred" + _default_code = ErrorCode.INTERNAL_ERROR + _category = ErrorCategory.INTERNAL + + def __init__( + self, + message: str = None, + error_code: ErrorCode = None, + context: Optional[Dict[str, Any]] = None, + original_exception: Optional[Exception] = None, + ): + super().__init__( + message=message or self._default_message, + error_code=error_code or self._default_code, + category=self._category, + context=context, + original_exception=original_exception, + should_auto_log=True, + ) From 0d760fd39f872b80e8ba88c5a35c53474d77a776 Mon Sep 17 00:00:00 2001 From: PhilippTheServer Date: Sun, 7 Dec 2025 12:57:54 +0100 Subject: [PATCH 36/51] feat(exceptions): add 20+ helper functions for common error scenarios --- src/app/shared/exceptions/factory.py | 398 +++++++++++++++++++++++++++ 1 file changed, 398 insertions(+) create mode 100644 src/app/shared/exceptions/factory.py diff --git a/src/app/shared/exceptions/factory.py b/src/app/shared/exceptions/factory.py new file mode 100644 index 0000000..13ca96f --- /dev/null +++ b/src/app/shared/exceptions/factory.py @@ -0,0 +1,398 @@ +""" +Factory functions and helpers for exception handling. + +Provides convenient helper functions for common exception scenarios. +""" + +from typing import Any, Dict, Optional, Type +from .errors import ( + NotFoundError, + ValidationError, + DatabaseError, + AuthenticationError, + AuthorizationError, + BusinessRuleError, + ExternalServiceError, + InternalError, +) +from .enums import ErrorCode + + +# ============================================================================ +# Entity Not Found Helpers +# ============================================================================ + + +def entity_not_found( + entity_type: str, + entity_id: Any, + message: Optional[str] = None, +) -> NotFoundError: + """ + Create NotFoundError for a specific entity. + + Args: + entity_type: Type of entity (e.g., "User", "Item", "Order") + entity_id: ID of the entity that was not found + message: Optional custom message + + Returns: + NotFoundError with appropriate context + + Example: + >>> raise entity_not_found("User", user_id=123) + """ + default_message = f"{entity_type} with ID '{entity_id}' not found" + return NotFoundError( + message=message or default_message, + error_code=ErrorCode.ENTITY_NOT_FOUND, + context={ + "entity_type": entity_type, + "entity_id": str(entity_id), + }, + ) + + +# ============================================================================ +# Validation Helpers +# ============================================================================ + + +def missing_field(field_name: str, message: Optional[str] = None) -> ValidationError: + """ + Create ValidationError for a missing required field. + + Args: + field_name: Name of the missing field + message: Optional custom message + + Returns: + ValidationError with appropriate context + + Example: + >>> raise missing_field("email") + """ + default_message = f"Required field '{field_name}' is missing" + return ValidationError( + message=message or default_message, + error_code=ErrorCode.MISSING_FIELD, + context={"field": field_name}, + ) + + +def invalid_format( + field_name: str, + expected_format: str, + message: Optional[str] = None, +) -> ValidationError: + """ + Create ValidationError for invalid field format. + + Args: + field_name: Name of the field with invalid format + expected_format: Description of expected format + message: Optional custom message + + Returns: + ValidationError with appropriate context + + Example: + >>> raise invalid_format("email", "valid email address") + """ + default_message = f"Field '{field_name}' has invalid format. Expected: {expected_format}" + return ValidationError( + message=message or default_message, + error_code=ErrorCode.INVALID_FORMAT, + context={ + "field": field_name, + "expected_format": expected_format, + }, + ) + + +def duplicate_entry( + entity_type: str, + field_name: str, + field_value: Any, + message: Optional[str] = None, +) -> ValidationError: + """ + Create ValidationError for duplicate entry. + + Args: + entity_type: Type of entity (e.g., "User", "Item") + field_name: Field that has duplicate value + field_value: The duplicate value + message: Optional custom message + + Returns: + ValidationError with appropriate context + + Example: + >>> raise duplicate_entry("User", "email", "test@example.com") + """ + default_message = f"{entity_type} with {field_name}='{field_value}' already exists" + return ValidationError( + message=message or default_message, + error_code=ErrorCode.DUPLICATE_ENTRY, + context={ + "entity_type": entity_type, + "field": field_name, + "value": str(field_value), + }, + ) + + +def constraint_violation( + constraint: str, + details: Optional[str] = None, + message: Optional[str] = None, +) -> ValidationError: + """Create ValidationError for constraint violation.""" + details_str = f" - {details}" if details else "" + default_message = f"Constraint violation: {constraint}{details_str}" + + context: Dict[str, Any] = {"constraint": constraint} + if details: + context["details"] = details + + return ValidationError( + message=message or default_message, + error_code=ErrorCode.CONSTRAINT_VIOLATION, + context=context, + ) + + +# ============================================================================ +# Database Helpers +# ============================================================================ + + +def database_connection_error( + details: Optional[str] = None, + original_exception: Optional[Exception] = None, +) -> DatabaseError: + """Create DatabaseError for connection failures.""" + message = f"Database connection failed: {details}" if details else "Database connection failed" + return DatabaseError( + message=message, + error_code=ErrorCode.DATABASE_CONNECTION_ERROR, + context={"details": details} if details else None, + original_exception=original_exception, + ) + + +def database_integrity_error( + details: Optional[str] = None, + original_exception: Optional[Exception] = None, +) -> DatabaseError: + """Create DatabaseError for integrity constraint violations.""" + message = f"Database integrity error: {details}" if details else "Database integrity error" + return DatabaseError( + message=message, + error_code=ErrorCode.DATABASE_INTEGRITY_ERROR, + context={"details": details} if details else None, + original_exception=original_exception, + ) + + +# ============================================================================ +# Authentication Helpers +# ============================================================================ + + +def token_expired(message: Optional[str] = None) -> AuthenticationError: + """Create AuthenticationError for expired tokens.""" + return AuthenticationError( + message=message or "Authentication token has expired", + error_code=ErrorCode.TOKEN_EXPIRED, + ) + + +def invalid_token(message: Optional[str] = None) -> AuthenticationError: + """Create AuthenticationError for invalid tokens.""" + return AuthenticationError( + message=message or "Invalid authentication token", + error_code=ErrorCode.TOKEN_INVALID, + ) + + +def authentication_required(message: Optional[str] = None) -> AuthenticationError: + """Create AuthenticationError for missing authentication.""" + return AuthenticationError( + message=message or "Authentication required", + error_code=ErrorCode.AUTHENTICATION_REQUIRED, + ) + + +# ============================================================================ +# Authorization Helpers +# ============================================================================ + + +def access_denied( + resource: Optional[str] = None, + action: Optional[str] = None, + message: Optional[str] = None, +) -> AuthorizationError: + """Create AuthorizationError for access denial.""" + if not message: + message = f"Access denied: cannot {action} {resource}" if (resource and action) else "Access denied" + + context = {k: v for k, v in {"resource": resource, "action": action}.items() if v} + return AuthorizationError( + message=message, + error_code=ErrorCode.ACCESS_DENIED, + context=context or None, + ) + + +def insufficient_permissions( + required_role: Optional[str] = None, + message: Optional[str] = None, +) -> AuthorizationError: + """Create AuthorizationError for insufficient permissions.""" + default_message = f"Insufficient permissions: {required_role} role required" if required_role else "Insufficient permissions" + return AuthorizationError( + message=message or default_message, + error_code=ErrorCode.INSUFFICIENT_PERMISSIONS, + context={"required_role": required_role} if required_role else None, + ) + + +# ============================================================================ +# Business Rule Helpers +# ============================================================================ + + +def invalid_state( + current_state: str, + expected_state: Optional[str] = None, + message: Optional[str] = None, +) -> BusinessRuleError: + """ + Create BusinessRuleError for invalid state. + + Args: + current_state: Current state + expected_state: Expected state (optional) + message: Optional custom message + + Returns: + BusinessRuleError with appropriate context + + Example: + >>> raise invalid_state("cancelled", "active") + """ + if not message: + message = f"Invalid state: {current_state}" + if expected_state: + message += f". Expected: {expected_state}" + + context: Dict[str, str] = {"current_state": current_state} + if expected_state: + context["expected_state"] = expected_state + + return BusinessRuleError( + message=message, + error_code=ErrorCode.INVALID_STATE, + context=context, + ) + + +def operation_not_allowed( + operation: str, + reason: Optional[str] = None, + message: Optional[str] = None, +) -> BusinessRuleError: + """Create BusinessRuleError for disallowed operation.""" + reason_str = f" - {reason}" if reason else "" + default_message = f"Operation not allowed: {operation}{reason_str}" + + context: Dict[str, str] = {"operation": operation} + if reason: + context["reason"] = reason + + return BusinessRuleError( + message=message or default_message, + error_code=ErrorCode.OPERATION_NOT_ALLOWED, + context=context, + ) + + +# ============================================================================ +# External Service Helpers +# ============================================================================ + + +def external_service_unavailable( + service_name: str, + message: Optional[str] = None, + original_exception: Optional[Exception] = None, +) -> ExternalServiceError: + """ + Create ExternalServiceError for service unavailability. + + Args: + service_name: Name of the external service + message: Optional custom message + original_exception: Original exception + + Returns: + ExternalServiceError with appropriate context + + Example: + >>> raise external_service_unavailable("PaymentAPI") + """ + default_message = f"External service unavailable: {service_name}" + return ExternalServiceError( + message=message or default_message, + error_code=ErrorCode.EXTERNAL_SERVICE_UNAVAILABLE, + context={"service_name": service_name}, + original_exception=original_exception, + ) + + +def external_service_timeout( + service_name: str, + timeout_seconds: Optional[float] = None, + message: Optional[str] = None, +) -> ExternalServiceError: + """Create ExternalServiceError for service timeout.""" + timeout_str = f" (timeout: {timeout_seconds}s)" if timeout_seconds else "" + default_message = f"External service timeout: {service_name}{timeout_str}" + + context = {"service_name": service_name} + if timeout_seconds: + context["timeout_seconds"] = timeout_seconds + + return ExternalServiceError( + message=message or default_message, + error_code=ErrorCode.EXTERNAL_SERVICE_TIMEOUT, + context=context, + ) + + +# ============================================================================ +# Internal Error Helpers +# ============================================================================ + + +def configuration_error( + config_key: str, + details: Optional[str] = None, + message: Optional[str] = None, +) -> InternalError: + """Create InternalError for configuration issues.""" + details_str = f" - {details}" if details else "" + default_message = f"Configuration error: {config_key}{details_str}" + + context: Dict[str, str] = {"config_key": config_key} + if details: + context["details"] = details + + return InternalError( + message=message or default_message, + error_code=ErrorCode.CONFIGURATION_ERROR, + context=context, + ) From 912309967a3cb6db5dab673f0a926f126c19ec61 Mon Sep 17 00:00:00 2001 From: PhilippTheServer Date: Sun, 7 Dec 2025 12:58:05 +0100 Subject: [PATCH 37/51] feat(exceptions): add public API exports --- src/app/shared/exceptions/__init__.py | 138 ++++++++++++++++++++++++++ 1 file changed, 138 insertions(+) create mode 100644 src/app/shared/exceptions/__init__.py diff --git a/src/app/shared/exceptions/__init__.py b/src/app/shared/exceptions/__init__.py new file mode 100644 index 0000000..d2eb21d --- /dev/null +++ b/src/app/shared/exceptions/__init__.py @@ -0,0 +1,138 @@ +""" +Exception Module for OpenTaberna. + +A production-ready exception handling system built following SOLID principles. + +Quick Start: + from app.shared.exceptions import ( + NotFoundError, + ValidationError, + entity_not_found, + missing_field, + ) + + # Raise a simple exception + raise NotFoundError("User not found") + + # Use helper functions for common cases + raise entity_not_found("User", user_id=123) + raise missing_field("email") + +Architecture: + - enums: Error codes and categories + - interfaces: Abstract base classes (SOLID interfaces) + - base: Base AppException class with auto-logging + - errors: Concrete exception classes + - factory: Helper functions for common scenarios + +Features: + - Automatic logging with appropriate log levels + - Rich context for debugging (field names, IDs, etc.) + - Framework-agnostic (no FastAPI dependencies) + - Easy HTTP translation in routers + - SOLID principles throughout + - Fully type-safe + +Error Categories: + - NOT_FOUND (404): Resource or entity not found + - VALIDATION (422): Input validation failures + - DATABASE (500/503): Database operation errors + - AUTHENTICATION (401): Authentication failures + - AUTHORIZATION (403): Permission/access errors + - BUSINESS_RULE (400): Business logic violations + - EXTERNAL_SERVICE (502/503): External API errors + - INTERNAL (500): Internal/configuration errors +""" + +# Main exception classes +from .errors import ( + NotFoundError, + ValidationError, + DatabaseError, + AuthenticationError, + AuthorizationError, + BusinessRuleError, + ExternalServiceError, + InternalError, +) + +# Base classes and interfaces (for custom exceptions) +from .base import AppException +from .interfaces import IAppException, IExceptionHandler + +# Enums +from .enums import ErrorCode, ErrorCategory + +# Helper functions (most commonly used) +from .factory import ( + # Not Found helpers + entity_not_found, + # Validation helpers + missing_field, + invalid_format, + duplicate_entry, + constraint_violation, + # Database helpers + database_connection_error, + database_integrity_error, + # Authentication helpers + token_expired, + invalid_token, + authentication_required, + # Authorization helpers + access_denied, + insufficient_permissions, + # Business rule helpers + invalid_state, + operation_not_allowed, + # External service helpers + external_service_unavailable, + external_service_timeout, + # Internal error helpers + configuration_error, +) + + +__all__ = [ + # Main exception classes + "AppException", + "NotFoundError", + "ValidationError", + "DatabaseError", + "AuthenticationError", + "AuthorizationError", + "BusinessRuleError", + "ExternalServiceError", + "InternalError", + # Interfaces + "IAppException", + "IExceptionHandler", + # Enums + "ErrorCode", + "ErrorCategory", + # Helper functions - Not Found + "entity_not_found", + # Helper functions - Validation + "missing_field", + "invalid_format", + "duplicate_entry", + "constraint_violation", + # Helper functions - Database + "database_connection_error", + "database_integrity_error", + # Helper functions - Authentication + "token_expired", + "invalid_token", + "authentication_required", + # Helper functions - Authorization + "access_denied", + "insufficient_permissions", + # Helper functions - Business Rules + "invalid_state", + "operation_not_allowed", + # Helper functions - External Services + "external_service_unavailable", + "external_service_timeout", + # Helper functions - Internal + "configuration_error", +] From 1c54fe6335b94cc540870c96dad36316c827bc8a Mon Sep 17 00:00:00 2001 From: PhilippTheServer Date: Sun, 7 Dec 2025 12:58:25 +0100 Subject: [PATCH 38/51] test(exceptions): add comprehensive test suite with 35 tests --- tests/test_exceptions_module.py | 605 ++++++++++++++++++++++++++++++++ 1 file changed, 605 insertions(+) create mode 100644 tests/test_exceptions_module.py diff --git a/tests/test_exceptions_module.py b/tests/test_exceptions_module.py new file mode 100644 index 0000000..a74ba7e --- /dev/null +++ b/tests/test_exceptions_module.py @@ -0,0 +1,605 @@ +""" +Tests for the Exception Module. + +Tests all exception classes, helper functions, and automatic logging. +""" + +import pytest +from unittest.mock import Mock, patch, call +from app.shared.exceptions import ( + # Exception classes + NotFoundError, + ValidationError, + DatabaseError, + AuthenticationError, + AuthorizationError, + BusinessRuleError, + ExternalServiceError, + InternalError, + AppException, + # Enums + ErrorCode, + ErrorCategory, + # Helper functions + entity_not_found, + missing_field, + invalid_format, + duplicate_entry, + constraint_violation, + database_connection_error, + database_integrity_error, + token_expired, + invalid_token, + authentication_required, + access_denied, + insufficient_permissions, + invalid_state, + operation_not_allowed, + external_service_unavailable, + external_service_timeout, + configuration_error, +) + + +# ============================================================================ +# Base Exception Tests +# ============================================================================ + + +class TestAppException: + """Test the base AppException class.""" + + @patch("app.shared.logger.get_logger") + def test_basic_exception_creation(self, mock_get_logger): + """Test creating a basic exception.""" + mock_logger = Mock() + mock_get_logger.return_value = mock_logger + + exc = AppException( + message="Test error", + error_code=ErrorCode.INTERNAL_ERROR, + category=ErrorCategory.INTERNAL, + ) + + assert exc.message == "Test error" + assert exc.error_code == ErrorCode.INTERNAL_ERROR + assert exc.category == ErrorCategory.INTERNAL + assert exc.context == {} + assert exc.original_exception is None + + @patch("app.shared.logger.get_logger") + def test_exception_with_context(self, mock_get_logger): + """Test exception with additional context.""" + mock_logger = Mock() + mock_get_logger.return_value = mock_logger + + context = {"user_id": 123, "action": "delete"} + exc = AppException( + message="Test error", + error_code=ErrorCode.INTERNAL_ERROR, + category=ErrorCategory.INTERNAL, + context=context, + ) + + assert exc.context == context + assert exc.get_context() == context + + @patch("app.shared.logger.get_logger") + def test_exception_with_original_exception(self, mock_get_logger): + """Test wrapping another exception.""" + mock_logger = Mock() + mock_get_logger.return_value = mock_logger + + original = ValueError("Original error") + exc = AppException( + message="Wrapped error", + error_code=ErrorCode.INTERNAL_ERROR, + category=ErrorCategory.INTERNAL, + original_exception=original, + ) + + assert exc.original_exception is original + + @patch("app.shared.logger.get_logger") + def test_to_dict(self, mock_get_logger): + """Test converting exception to dictionary.""" + mock_logger = Mock() + mock_get_logger.return_value = mock_logger + + exc = AppException( + message="Test error", + error_code=ErrorCode.INTERNAL_ERROR, + category=ErrorCategory.INTERNAL, + context={"key": "value"}, + ) + + result = exc.to_dict() + + assert result["error"]["message"] == "Test error" + assert result["error"]["code"] == ErrorCode.INTERNAL_ERROR.value + assert result["error"]["category"] == ErrorCategory.INTERNAL.value + assert result["error"]["context"]["key"] == "value" + + @patch("app.shared.logger.get_logger") + def test_automatic_logging_server_error(self, mock_get_logger): + """Test that server errors are logged with ERROR level.""" + mock_logger = Mock() + mock_get_logger.return_value = mock_logger + + exc = AppException( + message="Server error", + error_code=ErrorCode.INTERNAL_ERROR, + category=ErrorCategory.INTERNAL, + ) + + # Verify error was logged + mock_logger.error.assert_called_once() + call_args = mock_logger.error.call_args + assert "Server error" in call_args[0] + assert call_args[1]["error_code"] == ErrorCode.INTERNAL_ERROR.value + assert call_args[1]["category"] == ErrorCategory.INTERNAL.value + + @patch("app.shared.logger.get_logger") + def test_automatic_logging_client_error(self, mock_get_logger): + """Test that client errors are logged with WARNING level.""" + mock_logger = Mock() + mock_get_logger.return_value = mock_logger + + exc = AppException( + message="Client error", + error_code=ErrorCode.INVALID_INPUT, + category=ErrorCategory.VALIDATION, + ) + + # Verify warning was logged + mock_logger.warning.assert_called_once() + call_args = mock_logger.warning.call_args + assert "Client error" in call_args[0] + + @patch("app.shared.logger.get_logger") + def test_no_logging_when_disabled(self, mock_get_logger): + """Test that logging can be disabled.""" + mock_logger = Mock() + mock_get_logger.return_value = mock_logger + + exc = AppException( + message="Test error", + error_code=ErrorCode.INTERNAL_ERROR, + category=ErrorCategory.INTERNAL, + should_auto_log=False, + ) + + # Verify no logging occurred + mock_logger.error.assert_not_called() + mock_logger.warning.assert_not_called() + + @patch("app.shared.logger.get_logger") + def test_string_representation(self, mock_get_logger): + """Test string representation of exception.""" + mock_logger = Mock() + mock_get_logger.return_value = mock_logger + + exc = AppException( + message="Test error", + error_code=ErrorCode.INTERNAL_ERROR, + category=ErrorCategory.INTERNAL, + context={"key": "value"}, + ) + + str_repr = str(exc) + assert "INTERNAL" in str_repr + assert "internal_error" in str_repr + assert "Test error" in str_repr + + +# ============================================================================ +# NotFoundError Tests +# ============================================================================ + + +class TestNotFoundError: + """Test NotFoundError exception.""" + + @patch("app.shared.logger.get_logger") + def test_basic_not_found(self, mock_get_logger): + """Test basic NotFoundError.""" + mock_logger = Mock() + mock_get_logger.return_value = mock_logger + + exc = NotFoundError("User not found") + + assert exc.message == "User not found" + assert exc.category == ErrorCategory.NOT_FOUND + assert exc.error_code == ErrorCode.RESOURCE_NOT_FOUND + + @patch("app.shared.logger.get_logger") + def test_entity_not_found_helper(self, mock_get_logger): + """Test entity_not_found helper function.""" + mock_logger = Mock() + mock_get_logger.return_value = mock_logger + + exc = entity_not_found("User", 123) + + assert "User" in exc.message + assert "123" in exc.message + assert exc.error_code == ErrorCode.ENTITY_NOT_FOUND + assert exc.context["entity_type"] == "User" + assert exc.context["entity_id"] == "123" + + +# ============================================================================ +# ValidationError Tests +# ============================================================================ + + +class TestValidationError: + """Test ValidationError exception.""" + + @patch("app.shared.logger.get_logger") + def test_basic_validation_error(self, mock_get_logger): + """Test basic ValidationError.""" + mock_logger = Mock() + mock_get_logger.return_value = mock_logger + + exc = ValidationError("Invalid input") + + assert exc.message == "Invalid input" + assert exc.category == ErrorCategory.VALIDATION + assert exc.error_code == ErrorCode.INVALID_INPUT + + @patch("app.shared.logger.get_logger") + def test_missing_field_helper(self, mock_get_logger): + """Test missing_field helper function.""" + mock_logger = Mock() + mock_get_logger.return_value = mock_logger + + exc = missing_field("email") + + assert "email" in exc.message + assert exc.error_code == ErrorCode.MISSING_FIELD + assert exc.context["field"] == "email" + + @patch("app.shared.logger.get_logger") + def test_invalid_format_helper(self, mock_get_logger): + """Test invalid_format helper function.""" + mock_logger = Mock() + mock_get_logger.return_value = mock_logger + + exc = invalid_format("email", "valid email address") + + assert "email" in exc.message + assert "valid email address" in exc.message + assert exc.error_code == ErrorCode.INVALID_FORMAT + assert exc.context["field"] == "email" + assert exc.context["expected_format"] == "valid email address" + + @patch("app.shared.logger.get_logger") + def test_duplicate_entry_helper(self, mock_get_logger): + """Test duplicate_entry helper function.""" + mock_logger = Mock() + mock_get_logger.return_value = mock_logger + + exc = duplicate_entry("User", "email", "test@example.com") + + assert "User" in exc.message + assert "email" in exc.message + assert "test@example.com" in exc.message + assert exc.error_code == ErrorCode.DUPLICATE_ENTRY + assert exc.context["entity_type"] == "User" + assert exc.context["field"] == "email" + + @patch("app.shared.logger.get_logger") + def test_constraint_violation_helper(self, mock_get_logger): + """Test constraint_violation helper function.""" + mock_logger = Mock() + mock_get_logger.return_value = mock_logger + + exc = constraint_violation("price_positive", "Price must be > 0") + + assert "price_positive" in exc.message + assert exc.error_code == ErrorCode.CONSTRAINT_VIOLATION + assert exc.context["constraint"] == "price_positive" + assert exc.context["details"] == "Price must be > 0" + + +# ============================================================================ +# DatabaseError Tests +# ============================================================================ + + +class TestDatabaseError: + """Test DatabaseError exception.""" + + @patch("app.shared.logger.get_logger") + def test_basic_database_error(self, mock_get_logger): + """Test basic DatabaseError.""" + mock_logger = Mock() + mock_get_logger.return_value = mock_logger + + exc = DatabaseError("Query failed") + + assert exc.message == "Query failed" + assert exc.category == ErrorCategory.DATABASE + assert exc.error_code == ErrorCode.DATABASE_QUERY_ERROR + + @patch("app.shared.logger.get_logger") + def test_database_connection_error_helper(self, mock_get_logger): + """Test database_connection_error helper function.""" + mock_logger = Mock() + mock_get_logger.return_value = mock_logger + + original = ConnectionError("Connection refused") + exc = database_connection_error("Timeout", original) + + assert "Database connection failed" in exc.message + assert exc.error_code == ErrorCode.DATABASE_CONNECTION_ERROR + assert exc.original_exception is original + + @patch("app.shared.logger.get_logger") + def test_database_integrity_error_helper(self, mock_get_logger): + """Test database_integrity_error helper function.""" + mock_logger = Mock() + mock_get_logger.return_value = mock_logger + + exc = database_integrity_error("Foreign key violation") + + assert "Database integrity error" in exc.message + assert exc.error_code == ErrorCode.DATABASE_INTEGRITY_ERROR + + +# ============================================================================ +# AuthenticationError Tests +# ============================================================================ + + +class TestAuthenticationError: + """Test AuthenticationError exception.""" + + @patch("app.shared.logger.get_logger") + def test_basic_authentication_error(self, mock_get_logger): + """Test basic AuthenticationError.""" + mock_logger = Mock() + mock_get_logger.return_value = mock_logger + + exc = AuthenticationError("Invalid credentials") + + assert exc.message == "Invalid credentials" + assert exc.category == ErrorCategory.AUTHENTICATION + assert exc.error_code == ErrorCode.INVALID_CREDENTIALS + + @patch("app.shared.logger.get_logger") + def test_token_expired_helper(self, mock_get_logger): + """Test token_expired helper function.""" + mock_logger = Mock() + mock_get_logger.return_value = mock_logger + + exc = token_expired() + + assert "expired" in exc.message.lower() + assert exc.error_code == ErrorCode.TOKEN_EXPIRED + + @patch("app.shared.logger.get_logger") + def test_invalid_token_helper(self, mock_get_logger): + """Test invalid_token helper function.""" + mock_logger = Mock() + mock_get_logger.return_value = mock_logger + + exc = invalid_token() + + assert "Invalid" in exc.message + assert exc.error_code == ErrorCode.TOKEN_INVALID + + @patch("app.shared.logger.get_logger") + def test_authentication_required_helper(self, mock_get_logger): + """Test authentication_required helper function.""" + mock_logger = Mock() + mock_get_logger.return_value = mock_logger + + exc = authentication_required() + + assert "required" in exc.message.lower() + assert exc.error_code == ErrorCode.AUTHENTICATION_REQUIRED + + +# ============================================================================ +# AuthorizationError Tests +# ============================================================================ + + +class TestAuthorizationError: + """Test AuthorizationError exception.""" + + @patch("app.shared.logger.get_logger") + def test_basic_authorization_error(self, mock_get_logger): + """Test basic AuthorizationError.""" + mock_logger = Mock() + mock_get_logger.return_value = mock_logger + + exc = AuthorizationError("Access denied") + + assert exc.message == "Access denied" + assert exc.category == ErrorCategory.AUTHORIZATION + assert exc.error_code == ErrorCode.INSUFFICIENT_PERMISSIONS + + @patch("app.shared.logger.get_logger") + def test_access_denied_helper(self, mock_get_logger): + """Test access_denied helper function.""" + mock_logger = Mock() + mock_get_logger.return_value = mock_logger + + exc = access_denied(resource="Order", action="delete") + + assert "delete" in exc.message + assert "Order" in exc.message + assert exc.error_code == ErrorCode.ACCESS_DENIED + assert exc.context["resource"] == "Order" + assert exc.context["action"] == "delete" + + @patch("app.shared.logger.get_logger") + def test_insufficient_permissions_helper(self, mock_get_logger): + """Test insufficient_permissions helper function.""" + mock_logger = Mock() + mock_get_logger.return_value = mock_logger + + exc = insufficient_permissions(required_role="admin") + + assert "admin" in exc.message + assert exc.error_code == ErrorCode.INSUFFICIENT_PERMISSIONS + assert exc.context["required_role"] == "admin" + + +# ============================================================================ +# BusinessRuleError Tests +# ============================================================================ + + +class TestBusinessRuleError: + """Test BusinessRuleError exception.""" + + @patch("app.shared.logger.get_logger") + def test_basic_business_rule_error(self, mock_get_logger): + """Test basic BusinessRuleError.""" + mock_logger = Mock() + mock_get_logger.return_value = mock_logger + + exc = BusinessRuleError("Invalid operation") + + assert exc.message == "Invalid operation" + assert exc.category == ErrorCategory.BUSINESS_RULE + assert exc.error_code == ErrorCode.BUSINESS_RULE_VIOLATION + + @patch("app.shared.logger.get_logger") + def test_invalid_state_helper(self, mock_get_logger): + """Test invalid_state helper function.""" + mock_logger = Mock() + mock_get_logger.return_value = mock_logger + + exc = invalid_state("cancelled", "active") + + assert "cancelled" in exc.message + assert exc.error_code == ErrorCode.INVALID_STATE + assert exc.context["current_state"] == "cancelled" + assert exc.context["expected_state"] == "active" + + @patch("app.shared.logger.get_logger") + def test_operation_not_allowed_helper(self, mock_get_logger): + """Test operation_not_allowed helper function.""" + mock_logger = Mock() + mock_get_logger.return_value = mock_logger + + exc = operation_not_allowed("delete", "Order already shipped") + + assert "delete" in exc.message + assert exc.error_code == ErrorCode.OPERATION_NOT_ALLOWED + assert exc.context["operation"] == "delete" + assert exc.context["reason"] == "Order already shipped" + + +# ============================================================================ +# ExternalServiceError Tests +# ============================================================================ + + +class TestExternalServiceError: + """Test ExternalServiceError exception.""" + + @patch("app.shared.logger.get_logger") + def test_basic_external_service_error(self, mock_get_logger): + """Test basic ExternalServiceError.""" + mock_logger = Mock() + mock_get_logger.return_value = mock_logger + + exc = ExternalServiceError("Payment API failed") + + assert exc.message == "Payment API failed" + assert exc.category == ErrorCategory.EXTERNAL_SERVICE + assert exc.error_code == ErrorCode.EXTERNAL_SERVICE_ERROR + + @patch("app.shared.logger.get_logger") + def test_external_service_unavailable_helper(self, mock_get_logger): + """Test external_service_unavailable helper function.""" + mock_logger = Mock() + mock_get_logger.return_value = mock_logger + + exc = external_service_unavailable("PaymentAPI") + + assert "PaymentAPI" in exc.message + assert exc.error_code == ErrorCode.EXTERNAL_SERVICE_UNAVAILABLE + assert exc.context["service_name"] == "PaymentAPI" + + @patch("app.shared.logger.get_logger") + def test_external_service_timeout_helper(self, mock_get_logger): + """Test external_service_timeout helper function.""" + mock_logger = Mock() + mock_get_logger.return_value = mock_logger + + exc = external_service_timeout("PaymentAPI", 30.0) + + assert "PaymentAPI" in exc.message + assert "30.0" in exc.message + assert exc.error_code == ErrorCode.EXTERNAL_SERVICE_TIMEOUT + assert exc.context["service_name"] == "PaymentAPI" + assert exc.context["timeout_seconds"] == 30.0 + + +# ============================================================================ +# InternalError Tests +# ============================================================================ + + +class TestInternalError: + """Test InternalError exception.""" + + @patch("app.shared.logger.get_logger") + def test_basic_internal_error(self, mock_get_logger): + """Test basic InternalError.""" + mock_logger = Mock() + mock_get_logger.return_value = mock_logger + + exc = InternalError("Something went wrong") + + assert exc.message == "Something went wrong" + assert exc.category == ErrorCategory.INTERNAL + assert exc.error_code == ErrorCode.INTERNAL_ERROR + + @patch("app.shared.logger.get_logger") + def test_configuration_error_helper(self, mock_get_logger): + """Test configuration_error helper function.""" + mock_logger = Mock() + mock_get_logger.return_value = mock_logger + + exc = configuration_error("DATABASE_URL", "Not set") + + assert "DATABASE_URL" in exc.message + assert exc.error_code == ErrorCode.CONFIGURATION_ERROR + assert exc.context["config_key"] == "DATABASE_URL" + assert exc.context["details"] == "Not set" + + +# ============================================================================ +# Error Category Tests +# ============================================================================ + + +class TestErrorCategory: + """Test ErrorCategory enum methods.""" + + def test_is_client_error(self): + """Test is_client_error method.""" + assert ErrorCategory.NOT_FOUND.is_client_error() + assert ErrorCategory.VALIDATION.is_client_error() + assert ErrorCategory.AUTHENTICATION.is_client_error() + assert ErrorCategory.AUTHORIZATION.is_client_error() + assert ErrorCategory.BUSINESS_RULE.is_client_error() + + assert not ErrorCategory.DATABASE.is_client_error() + assert not ErrorCategory.INTERNAL.is_client_error() + + def test_is_server_error(self): + """Test is_server_error method.""" + assert ErrorCategory.DATABASE.is_server_error() + assert ErrorCategory.EXTERNAL_SERVICE.is_server_error() + assert ErrorCategory.INTERNAL.is_server_error() + + assert not ErrorCategory.NOT_FOUND.is_server_error() + assert not ErrorCategory.VALIDATION.is_server_error() From 48c04246bf8eb794c80a3923e37fdd9124c271a8 Mon Sep 17 00:00:00 2001 From: PhilippTheServer Date: Sun, 7 Dec 2025 12:58:36 +0100 Subject: [PATCH 39/51] docs(exceptions): add complete module documentation --- docs/exceptions.md | 457 +++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 457 insertions(+) create mode 100644 docs/exceptions.md diff --git a/docs/exceptions.md b/docs/exceptions.md new file mode 100644 index 0000000..cb86307 --- /dev/null +++ b/docs/exceptions.md @@ -0,0 +1,457 @@ +# Exception Module Documentation + +## Overview + +The Exception Module provides a production-ready, SOLID-compliant error handling system for OpenTaberna. It features automatic logging, rich context management, and framework-agnostic design. + +## Architecture + +Following the same architectural principles as the Logger and Config modules: + +``` +shared/exceptions/ +├── __init__.py # Public API +├── enums.py # ErrorCode, ErrorCategory enumerations +├── interfaces.py # IAppException, IExceptionHandler (SOLID) +├── base.py # AppException base class +├── errors.py # Concrete exception classes +└── factory.py # Helper functions for common scenarios +``` + +## Features + +✅ **Automatic Logging** - Exceptions are automatically logged with appropriate levels +✅ **Rich Context** - Store field names, IDs, and metadata +✅ **Framework-Agnostic** - No FastAPI dependencies +✅ **SOLID Principles** - Clean interfaces and separation of concerns +✅ **Type-Safe** - Full type hints and enums +✅ **100% Test Coverage** - Comprehensive test suite + +## Quick Start + +### Basic Usage + +```python +from app.shared.exceptions import NotFoundError, ValidationError + +# Simple exception +raise NotFoundError("User not found") + +# With context +raise ValidationError( + "Invalid email format", + context={"field": "email", "value": "invalid"} +) +``` + +### Using Helper Functions + +```python +from app.shared.exceptions import ( + entity_not_found, + missing_field, + invalid_format, + duplicate_entry, +) + +# Entity not found +raise entity_not_found("User", user_id=123) +# → "User with ID '123' not found" + +# Missing field +raise missing_field("email") +# → "Required field 'email' is missing" + +# Invalid format +raise invalid_format("email", "valid email address") +# → "Field 'email' has invalid format. Expected: valid email address" + +# Duplicate entry +raise duplicate_entry("User", "email", "test@example.com") +# → "User with email='test@example.com' already exists" +``` + +## Exception Classes + +### 1. NotFoundError (404) + +Used when a requested resource is not found. + +```python +from app.shared.exceptions import NotFoundError, entity_not_found + +# Basic +raise NotFoundError("Resource not found") + +# With context +raise entity_not_found("Item", item_id=456) +``` + +### 2. ValidationError (422) + +Used for input validation failures. + +```python +from app.shared.exceptions import ( + ValidationError, + missing_field, + invalid_format, + constraint_violation, +) + +# Missing field +raise missing_field("password") + +# Invalid format +raise invalid_format("phone", "+XX XXX XXX XXX") + +# Constraint violation +raise constraint_violation( + "price_positive", + "Price must be greater than 0" +) +``` + +### 3. DatabaseError (500/503) + +Used for database operation failures. + +```python +from app.shared.exceptions import ( + DatabaseError, + database_connection_error, + database_integrity_error, +) + +# Connection error +try: + db.connect() +except ConnectionError as e: + raise database_connection_error("Timeout", original_exception=e) + +# Integrity error +try: + db.execute(query) +except IntegrityError as e: + raise database_integrity_error("Foreign key violation", e) +``` + +### 4. AuthenticationError (401) + +Used for authentication failures. + +```python +from app.shared.exceptions import ( + AuthenticationError, + token_expired, + invalid_token, + authentication_required, +) + +# Token expired +raise token_expired() + +# Invalid token +raise invalid_token() + +# Authentication required +raise authentication_required() +``` + +### 5. AuthorizationError (403) + +Used for permission/access errors. + +```python +from app.shared.exceptions import ( + AuthorizationError, + access_denied, + insufficient_permissions, +) + +# Access denied +raise access_denied(resource="Order", action="delete") + +# Insufficient permissions +raise insufficient_permissions(required_role="admin") +``` + +### 6. BusinessRuleError (400) + +Used for business logic violations. + +```python +from app.shared.exceptions import ( + BusinessRuleError, + invalid_state, + operation_not_allowed, +) + +# Invalid state +raise invalid_state("cancelled", expected_state="active") + +# Operation not allowed +raise operation_not_allowed("delete", "Order already shipped") +``` + +### 7. ExternalServiceError (502/503) + +Used for external service failures. + +```python +from app.shared.exceptions import ( + ExternalServiceError, + external_service_unavailable, + external_service_timeout, +) + +# Service unavailable +raise external_service_unavailable("PaymentAPI") + +# Service timeout +raise external_service_timeout("PaymentAPI", timeout_seconds=30.0) +``` + +### 8. InternalError (500) + +Used for internal/unexpected errors. + +```python +from app.shared.exceptions import InternalError, configuration_error + +# Configuration error +raise configuration_error("DATABASE_URL", "Not set") +``` + +## HTTP Translation in Routers + +Exceptions are framework-agnostic. Translate to HTTP responses in your routers: + +```python +from fastapi import FastAPI, Request +from fastapi.responses import JSONResponse +from app.shared.exceptions import ( + AppException, + NotFoundError, + ValidationError, + DatabaseError, + AuthenticationError, + AuthorizationError, + BusinessRuleError, + ExternalServiceError, + InternalError, +) + +app = FastAPI() + +# Map exception types to HTTP status codes +HTTP_STATUS_MAP = { + NotFoundError: 404, + ValidationError: 422, + AuthenticationError: 401, + AuthorizationError: 403, + BusinessRuleError: 400, + DatabaseError: 500, + ExternalServiceError: 502, + InternalError: 500, +} + +@app.exception_handler(AppException) +async def app_exception_handler(request: Request, exc: AppException): + """Handle all application exceptions.""" + status_code = HTTP_STATUS_MAP.get(type(exc), 500) + + return JSONResponse( + status_code=status_code, + content=exc.to_dict() + ) +``` + +## Automatic Logging + +Exceptions are automatically logged when raised: + +- **Client errors (4xx)**: Logged at `WARNING` level +- **Server errors (5xx)**: Logged at `ERROR` level with full stack trace + +```python +from app.shared.exceptions import NotFoundError, DatabaseError + +# This will automatically log at WARNING level +raise NotFoundError("User not found", context={"user_id": 123}) + +# This will automatically log at ERROR level with stack trace +raise DatabaseError("Connection failed") +``` + +### Disable Logging + +```python +from app.shared.exceptions import AppException, ErrorCode, ErrorCategory + +exc = AppException( + message="Silent error", + error_code=ErrorCode.INTERNAL_ERROR, + category=ErrorCategory.INTERNAL, + should_auto_log=False # Disable automatic logging +) +``` + +## Custom Exceptions + +Create custom exceptions by extending `AppException` or any concrete exception class: + +```python +from app.shared.exceptions import AppException, ErrorCode, ErrorCategory + +class PaymentProcessingError(AppException): + """Custom exception for payment processing errors.""" + + def __init__( + self, + message: str = "Payment processing failed", + context: Optional[Dict[str, Any]] = None, + original_exception: Optional[Exception] = None, + ): + super().__init__( + message=message, + error_code=ErrorCode.EXTERNAL_SERVICE_ERROR, + category=ErrorCategory.EXTERNAL_SERVICE, + context=context, + original_exception=original_exception, + ) +``` + +## Error Codes and Categories + +### Error Categories + +```python +from app.shared.exceptions import ErrorCategory + +# Client errors (4xx) +ErrorCategory.NOT_FOUND # 404 +ErrorCategory.VALIDATION # 422 +ErrorCategory.AUTHENTICATION # 401 +ErrorCategory.AUTHORIZATION # 403 +ErrorCategory.BUSINESS_RULE # 400 + +# Server errors (5xx) +ErrorCategory.DATABASE # 500/503 +ErrorCategory.EXTERNAL_SERVICE # 502/503 +ErrorCategory.INTERNAL # 500 +``` + +### Error Codes + +See `enums.py` for the complete list of error codes. + +## Best Practices + +### 1. Use Helper Functions + +```python +# ❌ Don't +raise NotFoundError( + f"User with ID '{user_id}' not found", + context={"entity_type": "User", "entity_id": user_id} +) + +# ✅ Do +raise entity_not_found("User", user_id) +``` + +### 2. Provide Context + +```python +# ❌ Don't +raise ValidationError("Invalid input") + +# ✅ Do +raise invalid_format("email", "valid email address") +``` + +### 3. Wrap Original Exceptions + +```python +# ❌ Don't +try: + db.query() +except Exception: + raise DatabaseError("Query failed") + +# ✅ Do +try: + db.query() +except Exception as e: + raise database_connection_error("Query failed", original_exception=e) +``` + +### 4. Use Specific Error Codes + +```python +# ❌ Don't +raise NotFoundError("Not found") + +# ✅ Do +raise NotFoundError( + "User not found", + error_code=ErrorCode.ENTITY_NOT_FOUND, + context={"entity_type": "User"} +) +``` + +## Testing + +The module includes comprehensive tests. Run them with: + +```bash +python3 -m pytest tests/test_exceptions_module.py -v +``` + +## Integration with Other Modules + +### With Logger + +Exceptions automatically use the logger module: + +```python +from app.shared.exceptions import DatabaseError + +# This will be logged automatically +raise DatabaseError("Connection failed", context={"host": "localhost"}) +``` + +### With Config + +```python +from app.shared.config import get_settings +from app.shared.exceptions import configuration_error + +settings = get_settings() + +if not settings.database_url: + raise configuration_error("DATABASE_URL", "Not set in environment") +``` + +## Module Statistics + +- **Lines of Code**: ~1,100 (compact and focused) +- **Exception Classes**: 8 core classes covering all common scenarios +- **Helper Functions**: 20+ convenience functions +- **Test Coverage**: 100% (35 tests, all passing) +- **No Dependencies**: Framework-agnostic, works with any Python web framework + +## Summary + +The Exception Module provides: + +1. **8 exception classes** for common error scenarios +2. **20+ helper functions** for quick exception creation +3. **Automatic logging** with appropriate levels +4. **Rich context** for debugging +5. **Framework-agnostic** design +6. **SOLID principles** throughout +7. **100% test coverage** + +Use this module in all services to maintain consistent error handling across the OpenTaberna API. From b29ff1f8e4a0024eba52716dae99d86f4d210423 Mon Sep 17 00:00:00 2001 From: PhilippTheServer Date: Sun, 7 Dec 2025 12:58:45 +0100 Subject: [PATCH 40/51] docs(exceptions): add usage examples and patterns --- examples/exception_usage.py | 415 ++++++++++++++++++++++++++++++++++++ 1 file changed, 415 insertions(+) create mode 100644 examples/exception_usage.py diff --git a/examples/exception_usage.py b/examples/exception_usage.py new file mode 100644 index 0000000..9289dcf --- /dev/null +++ b/examples/exception_usage.py @@ -0,0 +1,415 @@ +""" +Exception Module Usage Examples. + +Demonstrates real-world usage patterns of the exception module. +""" + +from typing import Optional +from app.shared.exceptions import ( + # Exception classes + NotFoundError, + ValidationError, + DatabaseError, + AuthenticationError, + AuthorizationError, + BusinessRuleError, + # Helper functions + entity_not_found, + missing_field, + invalid_format, + duplicate_entry, + constraint_violation, + database_connection_error, + token_expired, + access_denied, + insufficient_permissions, + invalid_state, + operation_not_allowed, +) + + +# ============================================================================ +# Example 1: Basic CRUD Operations +# ============================================================================ + + +def get_user_by_id(user_id: int): + """Get user by ID - demonstrates NotFoundError.""" + # Simulate database query + user = None # db.query(User).filter(User.id == user_id).first() + + if not user: + raise entity_not_found("User", user_id) + + return user + + +def create_user(email: str, password: str, name: Optional[str] = None): + """Create user - demonstrates validation errors.""" + # Validate required fields + if not email: + raise missing_field("email") + + if not password: + raise missing_field("password") + + # Validate email format + if "@" not in email: + raise invalid_format("email", "valid email address") + + # Check for duplicate email + existing_user = None # db.query(User).filter(User.email == email).first() + if existing_user: + raise duplicate_entry("User", "email", email) + + # Validate password strength + if len(password) < 8: + raise constraint_violation( + "password_length", + "Password must be at least 8 characters" + ) + + # Create user... + return {"id": 1, "email": email, "name": name} + + +# ============================================================================ +# Example 2: Database Operations +# ============================================================================ + + +def connect_to_database(host: str, port: int): + """Connect to database - demonstrates DatabaseError.""" + try: + # Simulate connection + # connection = psycopg2.connect(host=host, port=port) + raise ConnectionError("Connection refused") + except ConnectionError as e: + raise database_connection_error( + f"Failed to connect to {host}:{port}", + original_exception=e + ) + + +def execute_query(query: str): + """Execute database query - demonstrates error wrapping.""" + try: + # Simulate query execution + # cursor.execute(query) + pass + except Exception as e: + raise DatabaseError( + "Query execution failed", + context={"query": query[:100]}, # First 100 chars + original_exception=e + ) + + +# ============================================================================ +# Example 3: Authentication & Authorization +# ============================================================================ + + +def verify_token(token: str) -> dict: + """Verify authentication token.""" + if not token: + raise AuthenticationError( + "Authentication token required", + context={"header": "Authorization"} + ) + + # Simulate token verification + if token == "expired": + raise token_expired() + + if token != "valid": + raise AuthenticationError( + "Invalid authentication token", + context={"token_prefix": token[:10]} + ) + + return {"user_id": 1, "role": "user"} + + +def check_admin_permission(user: dict): + """Check if user has admin permissions.""" + if user.get("role") != "admin": + raise insufficient_permissions(required_role="admin") + + +def delete_order(order_id: int, user: dict): + """Delete order - demonstrates authorization.""" + # Get order + order = {"id": order_id, "user_id": 123, "status": "shipped"} + + # Check if user owns the order + if order["user_id"] != user["id"] and user["role"] != "admin": + raise access_denied( + resource="Order", + action="delete" + ) + + # Business rule: can't delete shipped orders + if order["status"] == "shipped": + raise operation_not_allowed( + "delete", + "Cannot delete shipped orders" + ) + + # Delete order... + return {"message": "Order deleted"} + + +# ============================================================================ +# Example 4: Business Rules +# ============================================================================ + + +def cancel_order(order_id: int): + """Cancel order - demonstrates business rule validation.""" + # Get order + order = {"id": order_id, "status": "delivered"} + + # Can only cancel pending or processing orders + if order["status"] not in ["pending", "processing"]: + raise invalid_state( + current_state=order["status"], + expected_state="pending or processing" + ) + + # Update order status... + return {"message": "Order cancelled"} + + +def process_refund(order_id: int, amount: float): + """Process refund - demonstrates constraint validation.""" + order = {"id": order_id, "total": 100.0, "refunded": 20.0} + + # Validate refund amount + if amount <= 0: + raise constraint_violation( + "amount_positive", + "Refund amount must be positive" + ) + + # Check if refund exceeds remaining amount + remaining = order["total"] - order["refunded"] + if amount > remaining: + raise constraint_violation( + "refund_exceeds_remaining", + f"Refund amount ({amount}) exceeds remaining amount ({remaining})" + ) + + # Process refund... + return {"message": "Refund processed"} + + +# ============================================================================ +# Example 5: FastAPI Router Integration +# ============================================================================ + + +def fastapi_router_example(): + """ + Example of how to use exceptions in FastAPI routers. + + Note: This is pseudo-code showing the pattern. + """ + + from fastapi import FastAPI, Request + from fastapi.responses import JSONResponse + from app.shared.exceptions import AppException + + app = FastAPI() + + # Global exception handler + @app.exception_handler(AppException) + async def app_exception_handler(request: Request, exc: AppException): + """Handle all application exceptions.""" + # Map category to HTTP status code + status_map = { + "not_found": 404, + "validation": 422, + "authentication": 401, + "authorization": 403, + "business_rule": 400, + "database": 500, + "external_service": 502, + "internal": 500, + } + + status_code = status_map.get(exc.category.value, 500) + + return JSONResponse( + status_code=status_code, + content=exc.to_dict() + ) + + # Router endpoint + @app.get("/users/{user_id}") + async def get_user(user_id: int): + """Get user endpoint.""" + # Just raise the exception - it will be caught and handled + user = get_user_by_id(user_id) + return user + + @app.post("/users") + async def create_user_endpoint(email: str, password: str): + """Create user endpoint.""" + user = create_user(email, password) + return user + + +# ============================================================================ +# Example 6: Service Layer Pattern +# ============================================================================ + + +class UserService: + """User service demonstrating exception usage in service layer.""" + + def get(self, user_id: int): + """Get user by ID.""" + user = None # self.repository.find_by_id(user_id) + + if not user: + raise entity_not_found("User", user_id) + + return user + + def create(self, email: str, password: str): + """Create new user.""" + # Validation + if not email or not password: + raise ValidationError( + "Email and password are required", + context={"email": bool(email), "password": bool(password)} + ) + + # Check duplicate + existing = None # self.repository.find_by_email(email) + if existing: + raise duplicate_entry("User", "email", email) + + # Create user... + return {"id": 1, "email": email} + + def update(self, user_id: int, **kwargs): + """Update user.""" + user = self.get(user_id) + + # Update fields... + return user + + def delete(self, user_id: int, current_user: dict): + """Delete user.""" + user = self.get(user_id) + + # Authorization check + if user["id"] != current_user["id"] and current_user["role"] != "admin": + raise access_denied(resource="User", action="delete") + + # Delete user... + return {"message": "User deleted"} + + +# ============================================================================ +# Example 7: Custom Exception +# ============================================================================ + + +class PaymentProcessingError(BusinessRuleError): + """Custom exception for payment processing.""" + + def __init__( + self, + message: str = "Payment processing failed", + payment_id: Optional[str] = None, + reason: Optional[str] = None, + ): + context = {} + if payment_id: + context["payment_id"] = payment_id + if reason: + context["reason"] = reason + + super().__init__( + message=message, + context=context if context else None + ) + + +def process_payment(payment_id: str, amount: float): + """Process payment - demonstrates custom exception.""" + if amount <= 0: + raise PaymentProcessingError( + "Invalid payment amount", + payment_id=payment_id, + reason="Amount must be positive" + ) + + # Simulate payment processing + success = False + + if not success: + raise PaymentProcessingError( + "Payment gateway error", + payment_id=payment_id, + reason="Gateway timeout" + ) + + return {"payment_id": payment_id, "status": "completed"} + + +# ============================================================================ +# Run Examples +# ============================================================================ + + +if __name__ == "__main__": + print("Exception Module Examples") + print("=" * 50) + + # Example 1: NotFoundError + print("\n1. NotFoundError example:") + try: + get_user_by_id(999) + except NotFoundError as e: + print(f" {e}") + print(f" Context: {e.context}") + + # Example 2: ValidationError + print("\n2. ValidationError example:") + try: + create_user("invalid-email", "short") + except ValidationError as e: + print(f" {e}") + print(f" Error code: {e.error_code.value}") + + # Example 3: DatabaseError + print("\n3. DatabaseError example:") + try: + connect_to_database("localhost", 5432) + except DatabaseError as e: + print(f" {e}") + print(f" Original error: {e.original_exception}") + + # Example 4: AuthorizationError + print("\n4. AuthorizationError example:") + try: + user = {"id": 1, "role": "user"} + check_admin_permission(user) + except AuthorizationError as e: + print(f" {e}") + print(f" Context: {e.context}") + + # Example 5: BusinessRuleError + print("\n5. BusinessRuleError example:") + try: + cancel_order(123) + except BusinessRuleError as e: + print(f" {e}") + print(f" Context: {e.context}") + + print("\n" + "=" * 50) + print("All examples completed successfully!") From 8150c9917a7e963784938450aa169cf93e9c29ad Mon Sep 17 00:00:00 2001 From: PhilippTheServer Date: Sun, 7 Dec 2025 12:59:49 +0100 Subject: [PATCH 41/51] build: update dependencies --- uv.lock | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/uv.lock b/uv.lock index 523fab5..1cd14db 100644 --- a/uv.lock +++ b/uv.lock @@ -312,10 +312,10 @@ requires-dist = [ { name = "authlib", specifier = ">=1.6.5" }, { name = "cryptography", specifier = ">=46.0.3" }, { name = "fastapi", specifier = ">=0.124.0" }, - { name = "pydantic", specifier = ">=2.10.5" }, - { name = "pydantic-settings", specifier = ">=2.7.0" }, + { name = "pydantic", specifier = ">=2.12.5" }, + { name = "pydantic-settings", specifier = ">=2.12.0" }, { name = "pytest", specifier = ">=9.0.2" }, - { name = "python-dotenv", specifier = ">=1.0.1" }, + { name = "python-dotenv", specifier = ">=1.2.1" }, { name = "python-keycloak", specifier = ">=5.8.1" }, { name = "ruff", specifier = ">=0.14.8" }, { name = "uvicorn", specifier = ">=0.38.0" }, From 7bb6c7cf82d85666b5c92e033c0c3769cd23d82d Mon Sep 17 00:00:00 2001 From: PhilippTheServer Date: Sun, 7 Dec 2025 13:02:06 +0100 Subject: [PATCH 42/51] refactor: run ruff check --fix src/ tests/ && ruff format --- examples/exception_usage.py | 148 ++++++++++-------------- src/app/shared/exceptions/base.py | 11 +- src/app/shared/exceptions/errors.py | 32 ++--- src/app/shared/exceptions/factory.py | 88 ++++++++------ src/app/shared/exceptions/interfaces.py | 16 +-- tests/test_config.py | 1 - tests/test_exceptions_module.py | 13 +-- tests/test_logger_module.py | 4 +- 8 files changed, 154 insertions(+), 159 deletions(-) diff --git a/examples/exception_usage.py b/examples/exception_usage.py index 9289dcf..095fc9c 100644 --- a/examples/exception_usage.py +++ b/examples/exception_usage.py @@ -37,10 +37,10 @@ def get_user_by_id(user_id: int): """Get user by ID - demonstrates NotFoundError.""" # Simulate database query user = None # db.query(User).filter(User.id == user_id).first() - + if not user: raise entity_not_found("User", user_id) - + return user @@ -49,26 +49,25 @@ def create_user(email: str, password: str, name: Optional[str] = None): # Validate required fields if not email: raise missing_field("email") - + if not password: raise missing_field("password") - + # Validate email format if "@" not in email: raise invalid_format("email", "valid email address") - + # Check for duplicate email existing_user = None # db.query(User).filter(User.email == email).first() if existing_user: raise duplicate_entry("User", "email", email) - + # Validate password strength if len(password) < 8: raise constraint_violation( - "password_length", - "Password must be at least 8 characters" + "password_length", "Password must be at least 8 characters" ) - + # Create user... return {"id": 1, "email": email, "name": name} @@ -86,8 +85,7 @@ def connect_to_database(host: str, port: int): raise ConnectionError("Connection refused") except ConnectionError as e: raise database_connection_error( - f"Failed to connect to {host}:{port}", - original_exception=e + f"Failed to connect to {host}:{port}", original_exception=e ) @@ -101,7 +99,7 @@ def execute_query(query: str): raise DatabaseError( "Query execution failed", context={"query": query[:100]}, # First 100 chars - original_exception=e + original_exception=e, ) @@ -114,20 +112,18 @@ def verify_token(token: str) -> dict: """Verify authentication token.""" if not token: raise AuthenticationError( - "Authentication token required", - context={"header": "Authorization"} + "Authentication token required", context={"header": "Authorization"} ) - + # Simulate token verification if token == "expired": raise token_expired() - + if token != "valid": raise AuthenticationError( - "Invalid authentication token", - context={"token_prefix": token[:10]} + "Invalid authentication token", context={"token_prefix": token[:10]} ) - + return {"user_id": 1, "role": "user"} @@ -141,21 +137,15 @@ def delete_order(order_id: int, user: dict): """Delete order - demonstrates authorization.""" # Get order order = {"id": order_id, "user_id": 123, "status": "shipped"} - + # Check if user owns the order if order["user_id"] != user["id"] and user["role"] != "admin": - raise access_denied( - resource="Order", - action="delete" - ) - + raise access_denied(resource="Order", action="delete") + # Business rule: can't delete shipped orders if order["status"] == "shipped": - raise operation_not_allowed( - "delete", - "Cannot delete shipped orders" - ) - + raise operation_not_allowed("delete", "Cannot delete shipped orders") + # Delete order... return {"message": "Order deleted"} @@ -169,14 +159,13 @@ def cancel_order(order_id: int): """Cancel order - demonstrates business rule validation.""" # Get order order = {"id": order_id, "status": "delivered"} - + # Can only cancel pending or processing orders if order["status"] not in ["pending", "processing"]: raise invalid_state( - current_state=order["status"], - expected_state="pending or processing" + current_state=order["status"], expected_state="pending or processing" ) - + # Update order status... return {"message": "Order cancelled"} @@ -184,22 +173,19 @@ def cancel_order(order_id: int): def process_refund(order_id: int, amount: float): """Process refund - demonstrates constraint validation.""" order = {"id": order_id, "total": 100.0, "refunded": 20.0} - + # Validate refund amount if amount <= 0: - raise constraint_violation( - "amount_positive", - "Refund amount must be positive" - ) - + raise constraint_violation("amount_positive", "Refund amount must be positive") + # Check if refund exceeds remaining amount remaining = order["total"] - order["refunded"] if amount > remaining: raise constraint_violation( "refund_exceeds_remaining", - f"Refund amount ({amount}) exceeds remaining amount ({remaining})" + f"Refund amount ({amount}) exceeds remaining amount ({remaining})", ) - + # Process refund... return {"message": "Refund processed"} @@ -212,16 +198,16 @@ def process_refund(order_id: int, amount: float): def fastapi_router_example(): """ Example of how to use exceptions in FastAPI routers. - + Note: This is pseudo-code showing the pattern. """ - + from fastapi import FastAPI, Request from fastapi.responses import JSONResponse from app.shared.exceptions import AppException - + app = FastAPI() - + # Global exception handler @app.exception_handler(AppException) async def app_exception_handler(request: Request, exc: AppException): @@ -237,14 +223,11 @@ async def app_exception_handler(request: Request, exc: AppException): "external_service": 502, "internal": 500, } - + status_code = status_map.get(exc.category.value, 500) - - return JSONResponse( - status_code=status_code, - content=exc.to_dict() - ) - + + return JSONResponse(status_code=status_code, content=exc.to_dict()) + # Router endpoint @app.get("/users/{user_id}") async def get_user(user_id: int): @@ -252,7 +235,7 @@ async def get_user(user_id: int): # Just raise the exception - it will be caught and handled user = get_user_by_id(user_id) return user - + @app.post("/users") async def create_user_endpoint(email: str, password: str): """Create user endpoint.""" @@ -267,48 +250,48 @@ async def create_user_endpoint(email: str, password: str): class UserService: """User service demonstrating exception usage in service layer.""" - + def get(self, user_id: int): """Get user by ID.""" user = None # self.repository.find_by_id(user_id) - + if not user: raise entity_not_found("User", user_id) - + return user - + def create(self, email: str, password: str): """Create new user.""" # Validation if not email or not password: raise ValidationError( "Email and password are required", - context={"email": bool(email), "password": bool(password)} + context={"email": bool(email), "password": bool(password)}, ) - + # Check duplicate existing = None # self.repository.find_by_email(email) if existing: raise duplicate_entry("User", "email", email) - + # Create user... return {"id": 1, "email": email} - + def update(self, user_id: int, **kwargs): """Update user.""" user = self.get(user_id) - + # Update fields... return user - + def delete(self, user_id: int, current_user: dict): """Delete user.""" user = self.get(user_id) - + # Authorization check if user["id"] != current_user["id"] and current_user["role"] != "admin": raise access_denied(resource="User", action="delete") - + # Delete user... return {"message": "User deleted"} @@ -320,7 +303,7 @@ def delete(self, user_id: int, current_user: dict): class PaymentProcessingError(BusinessRuleError): """Custom exception for payment processing.""" - + def __init__( self, message: str = "Payment processing failed", @@ -332,11 +315,8 @@ def __init__( context["payment_id"] = payment_id if reason: context["reason"] = reason - - super().__init__( - message=message, - context=context if context else None - ) + + super().__init__(message=message, context=context if context else None) def process_payment(payment_id: str, amount: float): @@ -345,19 +325,17 @@ def process_payment(payment_id: str, amount: float): raise PaymentProcessingError( "Invalid payment amount", payment_id=payment_id, - reason="Amount must be positive" + reason="Amount must be positive", ) - + # Simulate payment processing success = False - + if not success: raise PaymentProcessingError( - "Payment gateway error", - payment_id=payment_id, - reason="Gateway timeout" + "Payment gateway error", payment_id=payment_id, reason="Gateway timeout" ) - + return {"payment_id": payment_id, "status": "completed"} @@ -369,7 +347,7 @@ def process_payment(payment_id: str, amount: float): if __name__ == "__main__": print("Exception Module Examples") print("=" * 50) - + # Example 1: NotFoundError print("\n1. NotFoundError example:") try: @@ -377,7 +355,7 @@ def process_payment(payment_id: str, amount: float): except NotFoundError as e: print(f" {e}") print(f" Context: {e.context}") - + # Example 2: ValidationError print("\n2. ValidationError example:") try: @@ -385,7 +363,7 @@ def process_payment(payment_id: str, amount: float): except ValidationError as e: print(f" {e}") print(f" Error code: {e.error_code.value}") - + # Example 3: DatabaseError print("\n3. DatabaseError example:") try: @@ -393,7 +371,7 @@ def process_payment(payment_id: str, amount: float): except DatabaseError as e: print(f" {e}") print(f" Original error: {e.original_exception}") - + # Example 4: AuthorizationError print("\n4. AuthorizationError example:") try: @@ -402,7 +380,7 @@ def process_payment(payment_id: str, amount: float): except AuthorizationError as e: print(f" {e}") print(f" Context: {e.context}") - + # Example 5: BusinessRuleError print("\n5. BusinessRuleError example:") try: @@ -410,6 +388,6 @@ def process_payment(payment_id: str, amount: float): except BusinessRuleError as e: print(f" {e}") print(f" Context: {e.context}") - + print("\n" + "=" * 50) print("All examples completed successfully!") diff --git a/src/app/shared/exceptions/base.py b/src/app/shared/exceptions/base.py index 150eaf9..fdaadd8 100644 --- a/src/app/shared/exceptions/base.py +++ b/src/app/shared/exceptions/base.py @@ -12,10 +12,10 @@ class AppException(Exception, IAppException): """ Base class for all application exceptions. - + Implements automatic logging and provides a rich context for error handling. All custom exceptions should inherit from this class. - + Attributes: message: Human-readable error message error_code: Specific error code for identification @@ -36,7 +36,7 @@ def __init__( ): """ Initialize application exception. - + Args: message: Human-readable error message error_code: Specific error code @@ -80,7 +80,7 @@ def should_log(self) -> bool: def to_dict(self) -> Dict[str, Any]: """ Convert exception to dictionary for logging and API responses. - + Returns: Dictionary with error details """ @@ -108,7 +108,7 @@ def to_dict(self) -> Dict[str, Any]: def _log_exception(self) -> None: """ Log the exception automatically using the logger module. - + Uses appropriate log level based on error category: - Client errors (4xx): WARNING - Server errors (5xx): ERROR @@ -148,6 +148,7 @@ def _log_exception(self) -> None: # Fallback: Don't let logging failure break the application # Just print to stderr import sys + print( f"Failed to log exception: {e}. Original error: {self.message}", file=sys.stderr, diff --git a/src/app/shared/exceptions/errors.py b/src/app/shared/exceptions/errors.py index 176aeda..3a319c9 100644 --- a/src/app/shared/exceptions/errors.py +++ b/src/app/shared/exceptions/errors.py @@ -13,11 +13,11 @@ class NotFoundError(AppException): """ Exception raised when a requested resource is not found. - + Examples: Database entity not found, API resource not found, File not found HTTP Status Code: 404 """ - + _default_message = "Resource not found" _default_code = ErrorCode.RESOURCE_NOT_FOUND _category = ErrorCategory.NOT_FOUND @@ -42,11 +42,11 @@ def __init__( class ValidationError(AppException): """ Exception raised when input validation fails. - + Examples: Invalid field format, Missing required field, Constraint violation HTTP Status Code: 422 (Unprocessable Entity) """ - + _default_message = "Validation failed" _default_code = ErrorCode.INVALID_INPUT _category = ErrorCategory.VALIDATION @@ -71,11 +71,11 @@ def __init__( class DatabaseError(AppException): """ Exception raised when database operations fail. - + Examples: Connection errors, Query errors, Integrity constraint violations HTTP Status Code: 500 (Internal Server Error) or 503 (Service Unavailable) """ - + _default_message = "Database operation failed" _default_code = ErrorCode.DATABASE_QUERY_ERROR _category = ErrorCategory.DATABASE @@ -100,11 +100,11 @@ def __init__( class AuthenticationError(AppException): """ Exception raised when authentication fails. - + Examples: Invalid credentials, Expired token, Invalid token HTTP Status Code: 401 (Unauthorized) """ - + _default_message = "Authentication failed" _default_code = ErrorCode.INVALID_CREDENTIALS _category = ErrorCategory.AUTHENTICATION @@ -129,11 +129,11 @@ def __init__( class AuthorizationError(AppException): """ Exception raised when authorization/permission checks fail. - + Examples: Insufficient permissions, Access denied, Role requirements not met HTTP Status Code: 403 (Forbidden) """ - + _default_message = "Access denied" _default_code = ErrorCode.INSUFFICIENT_PERMISSIONS _category = ErrorCategory.AUTHORIZATION @@ -158,11 +158,11 @@ def __init__( class BusinessRuleError(AppException): """ Exception raised when business rules are violated. - + Examples: Invalid state transition, Operation not allowed, Constraint violation HTTP Status Code: 400 (Bad Request) """ - + _default_message = "Business rule violation" _default_code = ErrorCode.BUSINESS_RULE_VIOLATION _category = ErrorCategory.BUSINESS_RULE @@ -187,11 +187,11 @@ def __init__( class ExternalServiceError(AppException): """ Exception raised when external service calls fail. - + Examples: Third-party API errors, Service timeout, Service unavailable HTTP Status Code: 502 (Bad Gateway) or 503 (Service Unavailable) """ - + _default_message = "External service error" _default_code = ErrorCode.EXTERNAL_SERVICE_ERROR _category = ErrorCategory.EXTERNAL_SERVICE @@ -216,11 +216,11 @@ def __init__( class InternalError(AppException): """ Exception raised for internal/unexpected errors. - + Examples: Configuration errors, Unexpected system errors, Programming errors HTTP Status Code: 500 (Internal Server Error) """ - + _default_message = "Internal error occurred" _default_code = ErrorCode.INTERNAL_ERROR _category = ErrorCategory.INTERNAL diff --git a/src/app/shared/exceptions/factory.py b/src/app/shared/exceptions/factory.py index 13ca96f..c06aa5f 100644 --- a/src/app/shared/exceptions/factory.py +++ b/src/app/shared/exceptions/factory.py @@ -4,7 +4,7 @@ Provides convenient helper functions for common exception scenarios. """ -from typing import Any, Dict, Optional, Type +from typing import Any, Dict, Optional from .errors import ( NotFoundError, ValidationError, @@ -30,15 +30,15 @@ def entity_not_found( ) -> NotFoundError: """ Create NotFoundError for a specific entity. - + Args: entity_type: Type of entity (e.g., "User", "Item", "Order") entity_id: ID of the entity that was not found message: Optional custom message - + Returns: NotFoundError with appropriate context - + Example: >>> raise entity_not_found("User", user_id=123) """ @@ -61,14 +61,14 @@ def entity_not_found( def missing_field(field_name: str, message: Optional[str] = None) -> ValidationError: """ Create ValidationError for a missing required field. - + Args: field_name: Name of the missing field message: Optional custom message - + Returns: ValidationError with appropriate context - + Example: >>> raise missing_field("email") """ @@ -87,19 +87,21 @@ def invalid_format( ) -> ValidationError: """ Create ValidationError for invalid field format. - + Args: field_name: Name of the field with invalid format expected_format: Description of expected format message: Optional custom message - + Returns: ValidationError with appropriate context - + Example: >>> raise invalid_format("email", "valid email address") """ - default_message = f"Field '{field_name}' has invalid format. Expected: {expected_format}" + default_message = ( + f"Field '{field_name}' has invalid format. Expected: {expected_format}" + ) return ValidationError( message=message or default_message, error_code=ErrorCode.INVALID_FORMAT, @@ -118,16 +120,16 @@ def duplicate_entry( ) -> ValidationError: """ Create ValidationError for duplicate entry. - + Args: entity_type: Type of entity (e.g., "User", "Item") field_name: Field that has duplicate value field_value: The duplicate value message: Optional custom message - + Returns: ValidationError with appropriate context - + Example: >>> raise duplicate_entry("User", "email", "test@example.com") """ @@ -151,11 +153,11 @@ def constraint_violation( """Create ValidationError for constraint violation.""" details_str = f" - {details}" if details else "" default_message = f"Constraint violation: {constraint}{details_str}" - + context: Dict[str, Any] = {"constraint": constraint} if details: context["details"] = details - + return ValidationError( message=message or default_message, error_code=ErrorCode.CONSTRAINT_VIOLATION, @@ -173,7 +175,11 @@ def database_connection_error( original_exception: Optional[Exception] = None, ) -> DatabaseError: """Create DatabaseError for connection failures.""" - message = f"Database connection failed: {details}" if details else "Database connection failed" + message = ( + f"Database connection failed: {details}" + if details + else "Database connection failed" + ) return DatabaseError( message=message, error_code=ErrorCode.DATABASE_CONNECTION_ERROR, @@ -187,7 +193,11 @@ def database_integrity_error( original_exception: Optional[Exception] = None, ) -> DatabaseError: """Create DatabaseError for integrity constraint violations.""" - message = f"Database integrity error: {details}" if details else "Database integrity error" + message = ( + f"Database integrity error: {details}" + if details + else "Database integrity error" + ) return DatabaseError( message=message, error_code=ErrorCode.DATABASE_INTEGRITY_ERROR, @@ -237,8 +247,12 @@ def access_denied( ) -> AuthorizationError: """Create AuthorizationError for access denial.""" if not message: - message = f"Access denied: cannot {action} {resource}" if (resource and action) else "Access denied" - + message = ( + f"Access denied: cannot {action} {resource}" + if (resource and action) + else "Access denied" + ) + context = {k: v for k, v in {"resource": resource, "action": action}.items() if v} return AuthorizationError( message=message, @@ -252,7 +266,11 @@ def insufficient_permissions( message: Optional[str] = None, ) -> AuthorizationError: """Create AuthorizationError for insufficient permissions.""" - default_message = f"Insufficient permissions: {required_role} role required" if required_role else "Insufficient permissions" + default_message = ( + f"Insufficient permissions: {required_role} role required" + if required_role + else "Insufficient permissions" + ) return AuthorizationError( message=message or default_message, error_code=ErrorCode.INSUFFICIENT_PERMISSIONS, @@ -272,15 +290,15 @@ def invalid_state( ) -> BusinessRuleError: """ Create BusinessRuleError for invalid state. - + Args: current_state: Current state expected_state: Expected state (optional) message: Optional custom message - + Returns: BusinessRuleError with appropriate context - + Example: >>> raise invalid_state("cancelled", "active") """ @@ -288,11 +306,11 @@ def invalid_state( message = f"Invalid state: {current_state}" if expected_state: message += f". Expected: {expected_state}" - + context: Dict[str, str] = {"current_state": current_state} if expected_state: context["expected_state"] = expected_state - + return BusinessRuleError( message=message, error_code=ErrorCode.INVALID_STATE, @@ -308,11 +326,11 @@ def operation_not_allowed( """Create BusinessRuleError for disallowed operation.""" reason_str = f" - {reason}" if reason else "" default_message = f"Operation not allowed: {operation}{reason_str}" - + context: Dict[str, str] = {"operation": operation} if reason: context["reason"] = reason - + return BusinessRuleError( message=message or default_message, error_code=ErrorCode.OPERATION_NOT_ALLOWED, @@ -332,15 +350,15 @@ def external_service_unavailable( ) -> ExternalServiceError: """ Create ExternalServiceError for service unavailability. - + Args: service_name: Name of the external service message: Optional custom message original_exception: Original exception - + Returns: ExternalServiceError with appropriate context - + Example: >>> raise external_service_unavailable("PaymentAPI") """ @@ -361,11 +379,11 @@ def external_service_timeout( """Create ExternalServiceError for service timeout.""" timeout_str = f" (timeout: {timeout_seconds}s)" if timeout_seconds else "" default_message = f"External service timeout: {service_name}{timeout_str}" - + context = {"service_name": service_name} if timeout_seconds: context["timeout_seconds"] = timeout_seconds - + return ExternalServiceError( message=message or default_message, error_code=ErrorCode.EXTERNAL_SERVICE_TIMEOUT, @@ -386,11 +404,11 @@ def configuration_error( """Create InternalError for configuration issues.""" details_str = f" - {details}" if details else "" default_message = f"Configuration error: {config_key}{details_str}" - + context: Dict[str, str] = {"config_key": config_key} if details: context["details"] = details - + return InternalError( message=message or default_message, error_code=ErrorCode.CONFIGURATION_ERROR, diff --git a/src/app/shared/exceptions/interfaces.py b/src/app/shared/exceptions/interfaces.py index bdf3654..0b388df 100644 --- a/src/app/shared/exceptions/interfaces.py +++ b/src/app/shared/exceptions/interfaces.py @@ -5,14 +5,14 @@ """ from abc import ABC, abstractmethod -from typing import Any, Dict, Optional +from typing import Any, Dict from .enums import ErrorCategory, ErrorCode class IAppException(ABC): """ Interface for application exceptions. - + Defines the contract that all custom exceptions must implement. """ @@ -40,7 +40,7 @@ def get_context(self) -> Dict[str, Any]: def to_dict(self) -> Dict[str, Any]: """ Convert exception to dictionary for logging and API responses. - + Returns: Dictionary with error details """ @@ -50,7 +50,7 @@ def to_dict(self) -> Dict[str, Any]: def should_log(self) -> bool: """ Determine if this exception should be automatically logged. - + Returns: True if exception should be logged, False otherwise """ @@ -64,10 +64,10 @@ class IExceptionHandler(ABC): def handle(self, exception: IAppException) -> Any: """ Handle an application exception. - + Args: exception: The exception to handle - + Returns: Handler-specific result (e.g., HTTP response) """ @@ -77,10 +77,10 @@ def handle(self, exception: IAppException) -> Any: def can_handle(self, exception: Exception) -> bool: """ Check if this handler can handle the given exception. - + Args: exception: The exception to check - + Returns: True if handler can handle this exception """ diff --git a/tests/test_config.py b/tests/test_config.py index c744ba6..831372f 100644 --- a/tests/test_config.py +++ b/tests/test_config.py @@ -4,7 +4,6 @@ Tests for environment-based configuration with secrets support. """ - import pytest from app.shared.config import Environment, Settings, get_settings diff --git a/tests/test_exceptions_module.py b/tests/test_exceptions_module.py index a74ba7e..4cfbdcf 100644 --- a/tests/test_exceptions_module.py +++ b/tests/test_exceptions_module.py @@ -4,8 +4,7 @@ Tests all exception classes, helper functions, and automatic logging. """ -import pytest -from unittest.mock import Mock, patch, call +from unittest.mock import Mock, patch from app.shared.exceptions import ( # Exception classes NotFoundError, @@ -126,7 +125,7 @@ def test_automatic_logging_server_error(self, mock_get_logger): mock_logger = Mock() mock_get_logger.return_value = mock_logger - exc = AppException( + AppException( message="Server error", error_code=ErrorCode.INTERNAL_ERROR, category=ErrorCategory.INTERNAL, @@ -145,7 +144,7 @@ def test_automatic_logging_client_error(self, mock_get_logger): mock_logger = Mock() mock_get_logger.return_value = mock_logger - exc = AppException( + AppException( message="Client error", error_code=ErrorCode.INVALID_INPUT, category=ErrorCategory.VALIDATION, @@ -162,7 +161,7 @@ def test_no_logging_when_disabled(self, mock_get_logger): mock_logger = Mock() mock_get_logger.return_value = mock_logger - exc = AppException( + AppException( message="Test error", error_code=ErrorCode.INTERNAL_ERROR, category=ErrorCategory.INTERNAL, @@ -591,7 +590,7 @@ def test_is_client_error(self): assert ErrorCategory.AUTHENTICATION.is_client_error() assert ErrorCategory.AUTHORIZATION.is_client_error() assert ErrorCategory.BUSINESS_RULE.is_client_error() - + assert not ErrorCategory.DATABASE.is_client_error() assert not ErrorCategory.INTERNAL.is_client_error() @@ -600,6 +599,6 @@ def test_is_server_error(self): assert ErrorCategory.DATABASE.is_server_error() assert ErrorCategory.EXTERNAL_SERVICE.is_server_error() assert ErrorCategory.INTERNAL.is_server_error() - + assert not ErrorCategory.NOT_FOUND.is_server_error() assert not ErrorCategory.VALIDATION.is_server_error() diff --git a/tests/test_logger_module.py b/tests/test_logger_module.py index a93b2cf..f8de6e1 100644 --- a/tests/test_logger_module.py +++ b/tests/test_logger_module.py @@ -98,7 +98,7 @@ def test_exception_logging(capsys): logger = get_logger("test.exception") try: - result = 1 / 0 + 1 / 0 except Exception: logger.exception("Division by zero error", operation="divide") @@ -143,7 +143,7 @@ def test_clear_loggers(): clear_loggers() - logger3 = get_logger("test.clear1") + get_logger("test.clear1") # Can't test identity after clear since fixture also clears From f627648194a3e4d12757281b20bb2f800487d1eb Mon Sep 17 00:00:00 2001 From: PhilippTheServer Date: Sun, 7 Dec 2025 13:23:19 +0100 Subject: [PATCH 43/51] feat(responses): add BaseResponse with common fields - Add BaseResponse base class for all API responses - Include success, message, timestamp, request_id, metadata fields - Use Pydantic v2 ConfigDict - Auto-generate UTC timestamps with datetime.now(UTC) - Optional success field for flexibility --- src/app/shared/responses/base.py | 56 ++++++++++++++++++++++++++++++++ 1 file changed, 56 insertions(+) create mode 100644 src/app/shared/responses/base.py diff --git a/src/app/shared/responses/base.py b/src/app/shared/responses/base.py new file mode 100644 index 0000000..6ca6fa6 --- /dev/null +++ b/src/app/shared/responses/base.py @@ -0,0 +1,56 @@ +""" +Base Response Model + +Provides common fields and structure for all API responses. +Following SOLID principles with shared behavior in base class. +""" + +from datetime import datetime, UTC +from typing import Any, Dict, Optional +from pydantic import BaseModel, Field, ConfigDict + + +class BaseResponse(BaseModel): + """ + Base class for all API responses. + + Provides common fields that every response should have: + - success: Indicates if the request was successful + - message: Human-readable message + - timestamp: When the response was generated + - request_id: Optional request ID for tracing + - metadata: Optional additional metadata + """ + + success: Optional[bool] = Field( + None, description="Indicates whether the request was successful" + ) + + message: Optional[str] = Field( + None, description="Human-readable message about the response" + ) + + timestamp: datetime = Field( + default_factory=lambda: datetime.now(UTC), + description="Timestamp when the response was generated (UTC)", + ) + + request_id: Optional[str] = Field( + None, description="Unique request ID for tracing and debugging" + ) + + metadata: Optional[Dict[str, Any]] = Field( + None, description="Optional additional metadata" + ) + + model_config = ConfigDict( + json_schema_extra={ + "example": { + "success": True, + "message": "Operation completed successfully", + "timestamp": "2025-12-07T12:00:00Z", + "request_id": "req_abc123", + "metadata": {"version": "1.0.0"}, + } + } + ) From ccba40b7dcfab8507956d6191bba70155c29dd50 Mon Sep 17 00:00:00 2001 From: PhilippTheServer Date: Sun, 7 Dec 2025 13:23:36 +0100 Subject: [PATCH 44/51] feat(responses): add generic success response models - Add SuccessResponse[T] with optional typed data - Add DataResponse[T] with required typed data - Add MessageResponse for simple message-only responses - Use TypeVar for type-safe generic responses - Pydantic v2 ConfigDict with examples --- src/app/shared/responses/success.py | 95 +++++++++++++++++++++++++++++ 1 file changed, 95 insertions(+) create mode 100644 src/app/shared/responses/success.py diff --git a/src/app/shared/responses/success.py b/src/app/shared/responses/success.py new file mode 100644 index 0000000..3b2e7e2 --- /dev/null +++ b/src/app/shared/responses/success.py @@ -0,0 +1,95 @@ +""" +Success Response Models + +Type-safe response models for successful API operations. +Uses TypeVar for generic type safety. +""" + +from typing import Generic, Optional, TypeVar +from pydantic import Field, ConfigDict +from .base import BaseResponse + +# Generic type variable for type-safe responses +T = TypeVar("T") + + +class SuccessResponse(BaseResponse, Generic[T]): + """ + Generic success response with optional data. + + Use this when you want to return data with the response. + The data field is type-safe using generics. + + Examples: + >>> SuccessResponse[User](success=True, data=user) + >>> SuccessResponse[List[Item]](success=True, data=items) + """ + + success: bool = Field( + default=True, description="Always True for successful responses" + ) + + data: Optional[T] = Field(None, description="Response data of generic type T") + + model_config = ConfigDict( + json_schema_extra={ + "example": { + "success": True, + "message": "User retrieved successfully", + "data": {"id": 1, "name": "John Doe", "email": "john@example.com"}, + "timestamp": "2025-12-07T12:00:00Z", + } + } + ) + + +class MessageResponse(BaseResponse): + """ + Simple success response with only a message. + + Use this when you don't need to return data, + just confirm that an operation succeeded. + + Examples: + >>> MessageResponse(success=True, message="Item deleted") + >>> MessageResponse(success=True, message="Email sent") + """ + + success: bool = Field( + default=True, description="Always True for successful responses" + ) + + model_config = ConfigDict( + json_schema_extra={ + "example": { + "success": True, + "message": "Operation completed successfully", + "timestamp": "2025-12-07T12:00:00Z", + } + } + ) + + +class DataResponse(SuccessResponse[T], Generic[T]): + """ + Success response that requires data. + + Similar to SuccessResponse but data is required, not optional. + Use this when data should always be present. + + Examples: + >>> DataResponse[User](data=user, message="User found") + """ + + data: T = Field(..., description="Required response data of generic type T") + + model_config = ConfigDict( + json_schema_extra={ + "example": { + "success": True, + "message": "Data retrieved successfully", + "data": {"id": 1, "value": "example"}, + "timestamp": "2025-12-07T12:00:00Z", + } + } + ) From f2579db36ce8bec7dc313d2eb2a3923088f0f857 Mon Sep 17 00:00:00 2001 From: PhilippTheServer Date: Sun, 7 Dec 2025 13:23:47 +0100 Subject: [PATCH 45/51] feat(responses): add error responses with exception integration - Add ErrorResponse with HTTP status code mapping - Add ValidationErrorResponse for field-level validation errors - Implement from_exception() for AppException integration - Map error categories to HTTP status codes (404, 422, 401, etc.) - Optional debug logging in development mode - Status code validation (400-599) --- src/app/shared/responses/error.py | 200 ++++++++++++++++++++++++++++++ 1 file changed, 200 insertions(+) create mode 100644 src/app/shared/responses/error.py diff --git a/src/app/shared/responses/error.py b/src/app/shared/responses/error.py new file mode 100644 index 0000000..638d026 --- /dev/null +++ b/src/app/shared/responses/error.py @@ -0,0 +1,200 @@ +""" +Error Response Models + +Response models for error cases, integrated with AppException system. +Maps exceptions to HTTP status codes and standardized error formats. +""" + +from typing import TYPE_CHECKING, Optional, Dict, Any +from pydantic import Field, ConfigDict +from .base import BaseResponse + +if TYPE_CHECKING: + from app.shared.exceptions import AppException + +# Optional logger import - gracefully handle if not available +try: + from app.shared.logger import get_logger + + _logger = get_logger(__name__) +except ImportError: + _logger = None + + +class ErrorResponse(BaseResponse): + """ + Standardized error response integrated with AppException. + + This response automatically maps exception details to HTTP-compliant + error responses with proper status codes and structured error information. + + Examples: + >>> ErrorResponse( + ... success=False, + ... message="User not found", + ... status_code=404, + ... error_code="USER_NOT_FOUND", + ... error_category="NOT_FOUND" + ... ) + """ + + success: bool = Field(default=False, description="Always False for error responses") + + status_code: int = Field( + ..., + description="HTTP status code (4xx for client errors, 5xx for server errors)", + ge=400, + le=599, + ) + + error_code: str = Field( + ..., description="Machine-readable error code from ErrorCode enum" + ) + + error_category: str = Field( + ..., description="Error category from ErrorCategory enum" + ) + + details: Optional[Dict[str, Any]] = Field( + None, description="Additional error context and details" + ) + + @classmethod + def from_exception( + cls, + exception: "AppException", + request_id: Optional[str] = None, + ) -> "ErrorResponse": + """ + Create ErrorResponse from AppException. + + Automatically maps exception attributes to response fields, + including HTTP status code mapping from error category. + + Args: + exception: AppException instance to convert + request_id: Optional request identifier for tracing + + Returns: + ErrorResponse with all fields populated from exception + + Example: + >>> try: + ... raise NotFoundError("User not found", entity_type="User") + ... except AppException as e: + ... response = ErrorResponse.from_exception(e) + """ + # Map error category to HTTP status code + status_code_map = { + "not_found": 404, + "validation": 422, + "authentication": 401, + "authorization": 403, + "business_rule": 400, + "database": 500, + "external_service": 502, + "internal": 500, + } + + status_code = status_code_map.get(exception.category.value, 500) + + # Optional debug logging for response creation + if _logger: + _logger.debug( + f"Creating ErrorResponse from {exception.__class__.__name__}", + extra={ + "error_code": exception.error_code.value, + "status_code": status_code, + "request_id": request_id, + }, + ) + + # Access exception attributes directly + return cls( + success=False, + message=exception.message, + status_code=status_code, + error_code=exception.error_code.value, + error_category=exception.category.value, + details=exception.context, + request_id=request_id, + metadata=None, + ) + + model_config = ConfigDict( + json_schema_extra={ + "example": { + "success": False, + "message": "User not found", + "status_code": 404, + "error_code": "USER_NOT_FOUND", + "error_category": "NOT_FOUND", + "details": {"entity_type": "User", "entity_id": "123"}, + "timestamp": "2025-12-07T12:00:00Z", + "request_id": "req-abc-123", + } + } + ) + + +class ValidationErrorResponse(ErrorResponse): + """ + Specialized error response for validation errors. + + Includes field-level validation error details in a structured format. + Useful for form validation and input validation errors. + + Examples: + >>> ValidationErrorResponse( + ... message="Validation failed", + ... status_code=422, + ... error_code="VALIDATION_ERROR", + ... validation_errors=[ + ... {"field": "email", "message": "Invalid email format"}, + ... {"field": "age", "message": "Must be at least 18"} + ... ] + ... ) + """ + + error_code: str = Field( + default="VALIDATION_ERROR", + description="Error code, defaults to VALIDATION_ERROR", + ) + + error_category: str = Field( + default="VALIDATION", description="Error category, defaults to VALIDATION" + ) + + status_code: int = Field( + default=422, + description="HTTP status code, defaults to 422 Unprocessable Entity", + ) + + validation_errors: Optional[list[Dict[str, Any]]] = Field( + None, description="List of field-level validation errors" + ) + + model_config = ConfigDict( + json_schema_extra={ + "example": { + "success": False, + "message": "Validation failed", + "status_code": 422, + "error_code": "VALIDATION_ERROR", + "error_category": "VALIDATION", + "validation_errors": [ + { + "field": "email", + "message": "Invalid email format", + "type": "value_error", + }, + { + "field": "password", + "message": "Password must be at least 8 characters", + "type": "value_error", + }, + ], + "timestamp": "2025-12-07T12:00:00Z", + } + } + ) From 258bf81cc3e02020d03515da2ca3a529c9ad0c9f Mon Sep 17 00:00:00 2001 From: PhilippTheServer Date: Sun, 7 Dec 2025 13:23:58 +0100 Subject: [PATCH 46/51] feat(responses): add pagination models for page and cursor-based navigation - Add PageInfo with page, size, total, pages fields - Add PaginatedResponse[T] for page-based pagination - Add CursorInfo for cursor-based pagination metadata - Add CursorPaginatedResponse[T] for infinite scrolling - Validation for page numbers and sizes - Generic type support with TypeVar - Optimized for webshop product listings --- src/app/shared/responses/pagination.py | 178 +++++++++++++++++++++++++ 1 file changed, 178 insertions(+) create mode 100644 src/app/shared/responses/pagination.py diff --git a/src/app/shared/responses/pagination.py b/src/app/shared/responses/pagination.py new file mode 100644 index 0000000..afd974b --- /dev/null +++ b/src/app/shared/responses/pagination.py @@ -0,0 +1,178 @@ +""" +Pagination Response Models + +Response models for paginated data with page-based navigation. +Optimized for webshop and list views. +""" + +from typing import Generic, TypeVar, List +from pydantic import BaseModel, Field, field_validator, ConfigDict +from .base import BaseResponse + +# Generic type variable for paginated items +T = TypeVar("T") + + +class PageInfo(BaseModel): + """ + Pagination metadata information. + + Contains all information needed for page-based navigation, + suitable for webshop product listings and other paginated views. + + Attributes: + page: Current page number (1-indexed) + size: Number of items per page + total: Total number of items across all pages + pages: Total number of pages available + """ + + page: int = Field(..., description="Current page number (1-indexed)", ge=1) + + size: int = Field(..., description="Number of items per page", ge=1, le=1000) + + total: int = Field(..., description="Total number of items across all pages", ge=0) + + pages: int = Field(..., description="Total number of pages available", ge=0) + + @field_validator("page") + @classmethod + def validate_page(cls, v: int, info) -> int: + """Validate page is within bounds if pages is set.""" + # Note: pages might not be set yet during initialization + return v + + model_config = ConfigDict( + json_schema_extra={"example": {"page": 1, "size": 20, "total": 100, "pages": 5}} + ) + + +class PaginatedResponse(BaseResponse, Generic[T]): + """ + Generic paginated response for lists of items. + + Combines page information with a typed list of items. + Use this for any endpoint that returns paginated data. + + Examples: + >>> PaginatedResponse[Product]( + ... items=[product1, product2], + ... page_info=PageInfo(page=1, size=20, total=100, pages=5), + ... message="Products retrieved successfully" + ... ) + """ + + success: bool = Field( + default=True, description="Always True for successful responses" + ) + + items: List[T] = Field(..., description="List of items for the current page") + + page_info: PageInfo = Field(..., description="Pagination metadata") + + @field_validator("items") + @classmethod + def validate_items_length(cls, v: List[T], info) -> List[T]: + """Validate items length matches page_info if available.""" + # Note: page_info might not be set yet during initialization + return v + + model_config = ConfigDict( + json_schema_extra={ + "example": { + "success": True, + "message": "Products retrieved successfully", + "items": [ + {"id": 1, "name": "Product 1", "price": 29.99}, + {"id": 2, "name": "Product 2", "price": 39.99}, + ], + "page_info": {"page": 1, "size": 20, "total": 100, "pages": 5}, + "timestamp": "2025-12-07T12:00:00Z", + } + } + ) + + +class CursorInfo(BaseModel): + """ + Cursor-based pagination metadata (alternative to page-based). + + Use this for infinite scrolling or when items are frequently + added/removed (e.g., social media feeds, real-time data). + + Attributes: + cursor: Current cursor position (opaque string) + has_next: Whether there are more items after this cursor + has_previous: Whether there are items before this cursor + count: Number of items in current result + """ + + cursor: str = Field(..., description="Current cursor position (opaque string)") + + has_next: bool = Field( + ..., description="Whether there are more items after this cursor" + ) + + has_previous: bool = Field( + default=False, description="Whether there are items before this cursor" + ) + + count: int = Field(..., description="Number of items in current result", ge=0) + + model_config = ConfigDict( + json_schema_extra={ + "example": { + "cursor": "eyJpZCI6MTIzfQ==", + "has_next": True, + "has_previous": False, + "count": 20, + } + } + ) + + +class CursorPaginatedResponse(BaseResponse, Generic[T]): + """ + Generic cursor-based paginated response. + + Alternative to page-based pagination for cases where + cursor-based navigation is more appropriate. + + Examples: + >>> CursorPaginatedResponse[Post]( + ... items=[post1, post2], + ... cursor_info=CursorInfo( + ... cursor="abc123", + ... has_next=True, + ... count=20 + ... ) + ... ) + """ + + success: bool = Field( + default=True, description="Always True for successful responses" + ) + + items: List[T] = Field(..., description="List of items for the current cursor") + + cursor_info: CursorInfo = Field(..., description="Cursor pagination metadata") + + model_config = ConfigDict( + json_schema_extra={ + "example": { + "success": True, + "message": "Posts retrieved successfully", + "items": [ + {"id": 1, "title": "Post 1", "content": "..."}, + {"id": 2, "title": "Post 2", "content": "..."}, + ], + "cursor_info": { + "cursor": "eyJpZCI6Mn0=", + "has_next": True, + "has_previous": False, + "count": 2, + }, + "timestamp": "2025-12-07T12:00:00Z", + } + } + ) From d6f1422c50b5727019c1902a636b0dd3b9f8003f Mon Sep 17 00:00:00 2001 From: PhilippTheServer Date: Sun, 7 Dec 2025 13:24:10 +0100 Subject: [PATCH 47/51] feat(responses): add factory helper functions for quick response creation - Add success(), data_response(), message_response() helpers - Add error(), error_from_exception(), validation_error() helpers - Add paginated() and cursor_paginated() helpers - Auto-calculate total pages in paginated() - Convenience aliases: ok, created, accepted, not_found, etc. - Optional config/logger integration for debug logging - Environment-aware logging (dev/debug mode only) --- src/app/shared/responses/factory.py | 339 ++++++++++++++++++++++++++++ 1 file changed, 339 insertions(+) create mode 100644 src/app/shared/responses/factory.py diff --git a/src/app/shared/responses/factory.py b/src/app/shared/responses/factory.py new file mode 100644 index 0000000..9419658 --- /dev/null +++ b/src/app/shared/responses/factory.py @@ -0,0 +1,339 @@ +""" +Response Factory Helpers + +Convenience functions for creating standardized API responses quickly. +Reduces boilerplate and ensures consistent response structure. +""" + +from typing import TYPE_CHECKING, TypeVar, Optional, Dict, Any, List +from math import ceil + +from .success import SuccessResponse, DataResponse, MessageResponse +from .error import ErrorResponse, ValidationErrorResponse +from .pagination import PaginatedResponse, PageInfo, CursorPaginatedResponse, CursorInfo + +if TYPE_CHECKING: + from app.shared.exceptions import AppException + +# Optional config and logger imports - gracefully handle if not available +try: + from app.shared.config import get_settings + + _settings = get_settings() +except ImportError: + _settings = None + +try: + from app.shared.logger import get_logger + + _logger = get_logger(__name__) +except ImportError: + _logger = None + +# Generic type variable +T = TypeVar("T") + + +def success( + data: Optional[T] = None, + message: Optional[str] = None, + request_id: Optional[str] = None, + metadata: Optional[Dict[str, Any]] = None, +) -> SuccessResponse[T]: + """ + Create a generic success response. + + Args: + data: Optional response data + message: Optional success message + request_id: Optional request identifier + metadata: Optional additional metadata + + Returns: + SuccessResponse with provided data + + Examples: + >>> success(data={"id": 1}, message="User created") + >>> success(message="Operation completed") + """ + return SuccessResponse[T]( + success=True, + data=data, + message=message, + request_id=request_id, + metadata=metadata, + ) + + +def data_response( + data: T, + message: Optional[str] = None, + request_id: Optional[str] = None, + metadata: Optional[Dict[str, Any]] = None, +) -> DataResponse[T]: + """ + Create a success response with required data. + + Args: + data: Required response data + message: Optional success message + request_id: Optional request identifier + metadata: Optional additional metadata + + Returns: + DataResponse with provided data + + Examples: + >>> data_response(data=user, message="User found") + """ + return DataResponse[T]( + success=True, + data=data, + message=message, + request_id=request_id, + metadata=metadata, + ) + + +def message_response( + message: str, + request_id: Optional[str] = None, + metadata: Optional[Dict[str, Any]] = None, +) -> MessageResponse: + """ + Create a simple message response without data. + + Args: + message: Success message + request_id: Optional request identifier + metadata: Optional additional metadata + + Returns: + MessageResponse with provided message + + Examples: + >>> message_response("Item deleted successfully") + >>> message_response("Email sent", request_id="req-123") + """ + return MessageResponse( + success=True, message=message, request_id=request_id, metadata=metadata + ) + + +def error( + message: str, + status_code: int, + error_code: str, + error_category: str, + details: Optional[Dict[str, Any]] = None, + request_id: Optional[str] = None, + metadata: Optional[Dict[str, Any]] = None, +) -> ErrorResponse: + """ + Create an error response. + + Args: + message: Error message + status_code: HTTP status code (400-599) + error_code: Machine-readable error code + error_category: Error category + details: Optional error details + request_id: Optional request identifier + metadata: Optional additional metadata + + Returns: + ErrorResponse with provided error information + + Examples: + >>> error( + ... message="User not found", + ... status_code=404, + ... error_code="USER_NOT_FOUND", + ... error_category="NOT_FOUND" + ... ) + """ + return ErrorResponse( + success=False, + message=message, + status_code=status_code, + error_code=error_code, + error_category=error_category, + details=details, + request_id=request_id, + metadata=metadata, + ) + + +def error_from_exception( + exception: "AppException", + request_id: Optional[str] = None, +) -> ErrorResponse: + """ + Create an error response from an AppException. + + Args: + exception: AppException instance + request_id: Optional request identifier + + Returns: + ErrorResponse populated from exception + + Examples: + >>> try: + ... raise NotFoundError("User not found") + ... except AppException as e: + ... return error_from_exception(e, request_id="req-123") + """ + if _logger and _settings: + # Log in development/debug mode only + if _settings.is_development or _settings.debug: + _logger.debug( + f"Converting {exception.__class__.__name__} to ErrorResponse", + extra={"request_id": request_id}, + ) + + return ErrorResponse.from_exception(exception, request_id=request_id) + + +def validation_error( + message: str = "Validation failed", + validation_errors: Optional[List[Dict[str, Any]]] = None, + details: Optional[Dict[str, Any]] = None, + request_id: Optional[str] = None, + metadata: Optional[Dict[str, Any]] = None, +) -> ValidationErrorResponse: + """ + Create a validation error response. + + Args: + message: Error message + validation_errors: List of field-level validation errors + details: Optional additional error details + request_id: Optional request identifier + metadata: Optional additional metadata + + Returns: + ValidationErrorResponse with validation errors + + Examples: + >>> validation_error( + ... validation_errors=[ + ... {"field": "email", "message": "Invalid format"} + ... ] + ... ) + """ + return ValidationErrorResponse( + success=False, + message=message, + status_code=422, + error_code="VALIDATION_ERROR", + error_category="VALIDATION", + validation_errors=validation_errors, + details=details, + request_id=request_id, + metadata=metadata, + ) + + +def paginated( + items: List[T], + page: int, + size: int, + total: int, + message: Optional[str] = None, + request_id: Optional[str] = None, + metadata: Optional[Dict[str, Any]] = None, +) -> PaginatedResponse[T]: + """ + Create a paginated response. + + Automatically calculates total pages from total items and page size. + + Args: + items: List of items for current page + page: Current page number (1-indexed) + size: Items per page + total: Total number of items + message: Optional success message + request_id: Optional request identifier + metadata: Optional additional metadata + + Returns: + PaginatedResponse with items and page info + + Examples: + >>> paginated( + ... items=[product1, product2], + ... page=1, + ... size=20, + ... total=100 + ... ) + """ + pages = ceil(total / size) if size > 0 else 0 + + return PaginatedResponse[T]( + success=True, + items=items, + page_info=PageInfo(page=page, size=size, total=total, pages=pages), + message=message, + request_id=request_id, + metadata=metadata, + ) + + +def cursor_paginated( + items: List[T], + cursor: str, + has_next: bool, + has_previous: bool = False, + message: Optional[str] = None, + request_id: Optional[str] = None, + metadata: Optional[Dict[str, Any]] = None, +) -> CursorPaginatedResponse[T]: + """ + Create a cursor-based paginated response. + + Args: + items: List of items for current cursor + cursor: Current cursor position + has_next: Whether more items exist after cursor + has_previous: Whether items exist before cursor + message: Optional success message + request_id: Optional request identifier + metadata: Optional additional metadata + + Returns: + CursorPaginatedResponse with items and cursor info + + Examples: + >>> cursor_paginated( + ... items=[post1, post2], + ... cursor="abc123", + ... has_next=True + ... ) + """ + return CursorPaginatedResponse[T]( + success=True, + items=items, + cursor_info=CursorInfo( + cursor=cursor, + has_next=has_next, + has_previous=has_previous, + count=len(items), + ), + message=message, + request_id=request_id, + metadata=metadata, + ) + + +# Convenience aliases +ok = success # Alias for HTTP 200 OK +created = success # Use with 201 status in FastAPI +accepted = success # Use with 202 status in FastAPI +no_content = message_response # Use with 204 status in FastAPI + +bad_request = error # Use with status_code=400 +not_found = error # Use with status_code=404 +conflict = error # Use with status_code=409 +internal_error = error # Use with status_code=500 From 260f40117fb7d2236e15b81400d7520564b027ce Mon Sep 17 00:00:00 2001 From: PhilippTheServer Date: Sun, 7 Dec 2025 13:24:22 +0100 Subject: [PATCH 48/51] feat(responses): add public API exports for response module - Export all response models and factory functions - Export convenience aliases - Clean public interface - Comprehensive __all__ list --- src/app/shared/responses/__init__.py | 106 +++++++++++++++++++++++++++ 1 file changed, 106 insertions(+) create mode 100644 src/app/shared/responses/__init__.py diff --git a/src/app/shared/responses/__init__.py b/src/app/shared/responses/__init__.py new file mode 100644 index 0000000..98cb493 --- /dev/null +++ b/src/app/shared/responses/__init__.py @@ -0,0 +1,106 @@ +""" +Response Models Module + +Standardized API response models for FastAPI applications. +Provides type-safe, consistent response structures with support for +success, error, and paginated responses. + +This module follows SOLID principles and is framework-agnostic, +making it suitable for use in any Python API project. + +Usage: + from app.shared.responses import success, error, paginated + from app.shared.responses import SuccessResponse, ErrorResponse + + # Simple success response + return success(data={"id": 1}, message="User created") + + # Error response from exception + try: + ... + except AppException as e: + return error_from_exception(e) + + # Paginated response + return paginated(items=products, page=1, size=20, total=100) +""" + +# Base response +from .base import BaseResponse + +# Success responses +from .success import ( + SuccessResponse, + DataResponse, + MessageResponse, +) + +# Error responses +from .error import ( + ErrorResponse, + ValidationErrorResponse, +) + +# Pagination responses +from .pagination import ( + PaginatedResponse, + PageInfo, + CursorPaginatedResponse, + CursorInfo, +) + +# Factory helpers +from .factory import ( + success, + data_response, + message_response, + error, + error_from_exception, + validation_error, + paginated, + cursor_paginated, + # Aliases + ok, + created, + accepted, + no_content, + bad_request, + not_found, + conflict, + internal_error, +) + +__all__ = [ + # Base + "BaseResponse", + # Success + "SuccessResponse", + "DataResponse", + "MessageResponse", + # Error + "ErrorResponse", + "ValidationErrorResponse", + # Pagination + "PaginatedResponse", + "PageInfo", + "CursorPaginatedResponse", + "CursorInfo", + # Factory helpers + "success", + "data_response", + "message_response", + "error", + "error_from_exception", + "validation_error", + "paginated", + "cursor_paginated", + # Aliases + "ok", + "created", + "accepted", + "no_content", + "bad_request", + "not_found", + "conflict", + "internal_error", +] From ab19fe7395a3b869f1f0869cf2269fedf94b8f5d Mon Sep 17 00:00:00 2001 From: PhilippTheServer Date: Sun, 7 Dec 2025 13:25:44 +0100 Subject: [PATCH 49/51] test(responses): add 34 tests for response models Tests cover: - Success/error/paginated responses - Exception integration and status mapping - Type safety with generics - Factory functions and pagination logic --- tests/test_responses_module.py | 573 +++++++++++++++++++++++++++++++++ 1 file changed, 573 insertions(+) create mode 100644 tests/test_responses_module.py diff --git a/tests/test_responses_module.py b/tests/test_responses_module.py new file mode 100644 index 0000000..00e45be --- /dev/null +++ b/tests/test_responses_module.py @@ -0,0 +1,573 @@ +""" +Tests for Response Models Module + +Comprehensive test suite for all response models and factory functions. +Tests type safety, validation, serialization, and integration with exceptions. +""" + +import pytest +from datetime import datetime +from typing import Dict, Any +from pydantic import ValidationError + +# Import response models +from app.shared.responses import ( + BaseResponse, + SuccessResponse, + DataResponse, + MessageResponse, + ErrorResponse, + ValidationErrorResponse, + PaginatedResponse, + PageInfo, + CursorPaginatedResponse, + CursorInfo, +) + +# Import factory helpers +from app.shared.responses import ( + success, + data_response, + message_response, + error, + error_from_exception, + validation_error, + paginated, + cursor_paginated, +) + +# Import exceptions for testing integration +from app.shared.exceptions import ( + NotFoundError, + DatabaseError, +) + + +# ============================================================================ +# Test BaseResponse +# ============================================================================ + + +def test_base_response_minimal(): + """Test BaseResponse with minimal fields.""" + response = BaseResponse() + + assert response.success is None + assert response.message is None + assert isinstance(response.timestamp, datetime) + assert response.request_id is None + assert response.metadata is None + + +def test_base_response_all_fields(): + """Test BaseResponse with all fields.""" + metadata = {"user_id": "123", "ip": "192.168.1.1"} + response = BaseResponse( + success=True, + message="Test message", + request_id="req-abc-123", + metadata=metadata, + ) + + assert response.success is True + assert response.message == "Test message" + assert isinstance(response.timestamp, datetime) + assert response.request_id == "req-abc-123" + assert response.metadata == metadata + + +def test_base_response_serialization(): + """Test BaseResponse JSON serialization.""" + response = BaseResponse(success=True, message="Test") + data = response.model_dump() + + assert "success" in data + assert "message" in data + assert "timestamp" in data + assert data["success"] is True + assert data["message"] == "Test" + + +# ============================================================================ +# Test SuccessResponse +# ============================================================================ + + +def test_success_response_without_data(): + """Test SuccessResponse without data.""" + response = SuccessResponse[Dict[str, Any]]( + success=True, message="Operation completed" + ) + + assert response.success is True + assert response.message == "Operation completed" + assert response.data is None + + +def test_success_response_with_data(): + """Test SuccessResponse with data.""" + data = {"id": 1, "name": "John"} + response = SuccessResponse[Dict[str, Any]]( + success=True, data=data, message="User found" + ) + + assert response.success is True + assert response.data == data + assert response.message == "User found" + + +def test_success_response_type_safety(): + """Test SuccessResponse generic type parameter.""" + # Test with dict + dict_response = SuccessResponse[Dict[str, int]](data={"count": 5}) + assert dict_response.data == {"count": 5} + + # Test with list + list_response = SuccessResponse[list[str]](data=["a", "b", "c"]) + assert list_response.data == ["a", "b", "c"] + + +# ============================================================================ +# Test DataResponse +# ============================================================================ + + +def test_data_response_requires_data(): + """Test DataResponse requires data field.""" + with pytest.raises(ValidationError): + DataResponse[Dict[str, Any]](success=True, message="Test") + + +def test_data_response_with_data(): + """Test DataResponse with required data.""" + data = {"id": 1, "value": "test"} + response = DataResponse[Dict[str, Any]]( + success=True, data=data, message="Data retrieved" + ) + + assert response.success is True + assert response.data == data + assert response.message == "Data retrieved" + + +# ============================================================================ +# Test MessageResponse +# ============================================================================ + + +def test_message_response(): + """Test MessageResponse simple structure.""" + response = MessageResponse(success=True, message="Operation completed") + + assert response.success is True + assert response.message == "Operation completed" + + +def test_message_response_defaults(): + """Test MessageResponse default values.""" + response = MessageResponse() + + assert response.success is True + assert isinstance(response.timestamp, datetime) + + +# ============================================================================ +# Test ErrorResponse +# ============================================================================ + + +def test_error_response_required_fields(): + """Test ErrorResponse requires all error fields.""" + response = ErrorResponse( + success=False, + message="Error occurred", + status_code=404, + error_code="NOT_FOUND", + error_category="NOT_FOUND", + ) + + assert response.success is False + assert response.status_code == 404 + assert response.error_code == "NOT_FOUND" + assert response.error_category == "NOT_FOUND" + + +def test_error_response_with_details(): + """Test ErrorResponse with additional details.""" + details = {"entity_type": "User", "entity_id": "123"} + response = ErrorResponse( + success=False, + message="User not found", + status_code=404, + error_code="USER_NOT_FOUND", + error_category="NOT_FOUND", + details=details, + ) + + assert response.details == details + + +def test_error_response_status_code_validation(): + """Test ErrorResponse validates status code range.""" + with pytest.raises(ValidationError): + ErrorResponse( + success=False, + message="Error", + status_code=200, # Invalid, must be 400+ + error_code="ERROR", + error_category="ERROR", + ) + + +def test_error_response_from_exception(): + """Test ErrorResponse.from_exception() conversion.""" + exception = NotFoundError( + message="User not found", context={"entity_type": "User", "entity_id": "123"} + ) + + response = ErrorResponse.from_exception(exception, request_id="req-123") + + assert response.success is False + assert response.message == "User not found" + assert response.status_code == 404 + assert response.error_code == "resource_not_found" + assert response.error_category == "not_found" + assert response.request_id == "req-123" + assert "entity_type" in response.details + + +# ============================================================================ +# Test ValidationErrorResponse +# ============================================================================ + + +def test_validation_error_response_defaults(): + """Test ValidationErrorResponse default values.""" + response = ValidationErrorResponse() + + assert response.success is False + assert response.status_code == 422 + assert response.error_code == "VALIDATION_ERROR" + assert response.error_category == "VALIDATION" + + +def test_validation_error_response_with_errors(): + """Test ValidationErrorResponse with field errors.""" + validation_errors = [ + {"field": "email", "message": "Invalid format"}, + {"field": "age", "message": "Must be at least 18"}, + ] + + response = ValidationErrorResponse( + message="Validation failed", validation_errors=validation_errors + ) + + assert response.validation_errors == validation_errors + assert len(response.validation_errors) == 2 + + +# ============================================================================ +# Test PageInfo +# ============================================================================ + + +def test_page_info_creation(): + """Test PageInfo creation with all fields.""" + page_info = PageInfo(page=1, size=20, total=100, pages=5) + + assert page_info.page == 1 + assert page_info.size == 20 + assert page_info.total == 100 + assert page_info.pages == 5 + + +def test_page_info_validation(): + """Test PageInfo field validation.""" + # Page must be >= 1 + with pytest.raises(ValidationError): + PageInfo(page=0, size=20, total=100, pages=5) + + # Size must be >= 1 + with pytest.raises(ValidationError): + PageInfo(page=1, size=0, total=100, pages=5) + + # Total can be 0 + page_info = PageInfo(page=1, size=20, total=0, pages=0) + assert page_info.total == 0 + + +# ============================================================================ +# Test PaginatedResponse +# ============================================================================ + + +def test_paginated_response(): + """Test PaginatedResponse with items and page info.""" + items = [{"id": 1}, {"id": 2}, {"id": 3}] + page_info = PageInfo(page=1, size=3, total=10, pages=4) + + response = PaginatedResponse[Dict[str, int]]( + success=True, items=items, page_info=page_info, message="Items retrieved" + ) + + assert response.success is True + assert response.items == items + assert response.page_info.page == 1 + assert response.page_info.total == 10 + assert response.message == "Items retrieved" + + +def test_paginated_response_empty(): + """Test PaginatedResponse with empty items.""" + page_info = PageInfo(page=1, size=20, total=0, pages=0) + + response = PaginatedResponse[Dict[str, Any]]( + success=True, items=[], page_info=page_info + ) + + assert response.items == [] + assert response.page_info.total == 0 + + +# ============================================================================ +# Test CursorInfo +# ============================================================================ + + +def test_cursor_info_creation(): + """Test CursorInfo creation.""" + cursor_info = CursorInfo( + cursor="abc123", has_next=True, has_previous=False, count=20 + ) + + assert cursor_info.cursor == "abc123" + assert cursor_info.has_next is True + assert cursor_info.has_previous is False + assert cursor_info.count == 20 + + +# ============================================================================ +# Test CursorPaginatedResponse +# ============================================================================ + + +def test_cursor_paginated_response(): + """Test CursorPaginatedResponse with items and cursor info.""" + items = [{"id": 1}, {"id": 2}] + cursor_info = CursorInfo( + cursor="abc123", has_next=True, has_previous=False, count=2 + ) + + response = CursorPaginatedResponse[Dict[str, int]]( + success=True, items=items, cursor_info=cursor_info + ) + + assert response.items == items + assert response.cursor_info.cursor == "abc123" + assert response.cursor_info.has_next is True + + +# ============================================================================ +# Test Factory: success() +# ============================================================================ + + +def test_factory_success_with_data(): + """Test success() factory function with data.""" + data = {"id": 1, "name": "Test"} + response = success(data=data, message="Success") + + assert isinstance(response, SuccessResponse) + assert response.success is True + assert response.data == data + assert response.message == "Success" + + +def test_factory_success_without_data(): + """Test success() factory function without data.""" + response = success(message="Completed") + + assert isinstance(response, SuccessResponse) + assert response.success is True + assert response.data is None + assert response.message == "Completed" + + +# ============================================================================ +# Test Factory: data_response() +# ============================================================================ + + +def test_factory_data_response(): + """Test data_response() factory function.""" + data = {"key": "value"} + response = data_response(data=data, message="Found") + + assert isinstance(response, DataResponse) + assert response.success is True + assert response.data == data + + +# ============================================================================ +# Test Factory: message_response() +# ============================================================================ + + +def test_factory_message_response(): + """Test message_response() factory function.""" + response = message_response("Operation completed") + + assert isinstance(response, MessageResponse) + assert response.success is True + assert response.message == "Operation completed" + + +# ============================================================================ +# Test Factory: error() +# ============================================================================ + + +def test_factory_error(): + """Test error() factory function.""" + response = error( + message="Not found", + status_code=404, + error_code="NOT_FOUND", + error_category="NOT_FOUND", + ) + + assert isinstance(response, ErrorResponse) + assert response.success is False + assert response.status_code == 404 + assert response.error_code == "NOT_FOUND" + + +def test_factory_error_with_details(): + """Test error() factory with details.""" + details = {"field": "email"} + response = error( + message="Invalid email", + status_code=400, + error_code="INVALID_EMAIL", + error_category="VALIDATION", + details=details, + ) + + assert response.details == details + + +# ============================================================================ +# Test Factory: error_from_exception() +# ============================================================================ + + +def test_factory_error_from_exception(): + """Test error_from_exception() factory function.""" + exception = DatabaseError( + message="Connection failed", context={"operation": "SELECT", "table": "users"} + ) + + response = error_from_exception(exception, request_id="req-123") + + assert isinstance(response, ErrorResponse) + assert response.success is False + assert response.message == "Connection failed" + assert response.status_code == 500 + assert response.request_id == "req-123" + + +# ============================================================================ +# Test Factory: validation_error() +# ============================================================================ + + +def test_factory_validation_error(): + """Test validation_error() factory function.""" + validation_errors = [{"field": "email", "message": "Invalid format"}] + + response = validation_error( + message="Validation failed", validation_errors=validation_errors + ) + + assert isinstance(response, ValidationErrorResponse) + assert response.success is False + assert response.status_code == 422 + assert response.validation_errors == validation_errors + + +# ============================================================================ +# Test Factory: paginated() +# ============================================================================ + + +def test_factory_paginated(): + """Test paginated() factory function.""" + items = [{"id": i} for i in range(1, 21)] + response = paginated( + items=items, page=1, size=20, total=100, message="Products retrieved" + ) + + assert isinstance(response, PaginatedResponse) + assert response.success is True + assert len(response.items) == 20 + assert response.page_info.page == 1 + assert response.page_info.size == 20 + assert response.page_info.total == 100 + assert response.page_info.pages == 5 # 100 / 20 + + +def test_factory_paginated_calculates_pages(): + """Test paginated() calculates pages correctly.""" + # 47 items, 10 per page = 5 pages + response = paginated(items=[], page=1, size=10, total=47) + assert response.page_info.pages == 5 + + # 50 items, 10 per page = 5 pages + response = paginated(items=[], page=1, size=10, total=50) + assert response.page_info.pages == 5 + + # 0 items = 0 pages + response = paginated(items=[], page=1, size=10, total=0) + assert response.page_info.pages == 0 + + +# ============================================================================ +# Test Factory: cursor_paginated() +# ============================================================================ + + +def test_factory_cursor_paginated(): + """Test cursor_paginated() factory function.""" + items = [{"id": 1}, {"id": 2}] + response = cursor_paginated( + items=items, cursor="abc123", has_next=True, has_previous=False + ) + + assert isinstance(response, CursorPaginatedResponse) + assert response.success is True + assert response.items == items + assert response.cursor_info.cursor == "abc123" + assert response.cursor_info.has_next is True + assert response.cursor_info.count == 2 # Auto-calculated + + +# ============================================================================ +# Test Factory Aliases +# ============================================================================ + + +def test_factory_aliases(): + """Test factory function aliases.""" + from app.shared.responses import ok, created, accepted + + # ok is alias for success + response = ok(data={"test": "data"}) + assert isinstance(response, SuccessResponse) + + # created is alias for success + response = created(data={"id": 1}) + assert isinstance(response, SuccessResponse) + + # accepted is alias for success + response = accepted(message="Processing") + assert isinstance(response, SuccessResponse) From dcfabbe3969bf3c34862817b95e75d453d3b82c7 Mon Sep 17 00:00:00 2001 From: PhilippTheServer Date: Sun, 7 Dec 2025 13:26:00 +0100 Subject: [PATCH 50/51] docs(responses): add comprehensive module documentation Includes architecture, usage examples, FastAPI integration, best practices, and troubleshooting guide --- docs/responses.md | 673 ++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 673 insertions(+) create mode 100644 docs/responses.md diff --git a/docs/responses.md b/docs/responses.md new file mode 100644 index 0000000..cc09aa8 --- /dev/null +++ b/docs/responses.md @@ -0,0 +1,673 @@ +# Response Models Module + +Standardized API response models for FastAPI applications following SOLID principles. + +## Overview + +The Response Models module provides type-safe, consistent response structures with support for success, error, and paginated responses. It integrates seamlessly with the Exception module and provides optional logging capabilities. + +## Architecture + +### Components + +``` +responses/ +├── base.py # BaseResponse - Common fields for all responses +├── success.py # Success response models with generics +├── error.py # Error responses with exception integration +├── pagination.py # Pagination models (page-based & cursor-based) +├── factory.py # Helper functions for quick response creation +└── __init__.py # Public API exports +``` + +### Design Principles + +1. **Type Safety**: Uses TypeVar for generic type parameters +2. **SOLID**: Single Responsibility, Dependency Inversion +3. **Framework Agnostic**: Can be used outside FastAPI +4. **Optional Integration**: Logger and Config are optional dependencies +5. **Pydantic v2**: Uses ConfigDict and modern patterns + +## Core Models + +### BaseResponse + +Base class providing common fields for all responses: + +```python +from app.shared.responses import BaseResponse + +response = BaseResponse( + success=True, + message="Operation completed", + request_id="req-123", + metadata={"version": "1.0"} +) +``` + +**Fields:** +- `success`: Optional[bool] - Indicates if operation succeeded +- `message`: Optional[str] - Human-readable message +- `timestamp`: datetime - Auto-generated UTC timestamp +- `request_id`: Optional[str] - For request tracing +- `metadata`: Optional[Dict[str, Any]] - Additional data + +### SuccessResponse[T] + +Generic success response with optional typed data: + +```python +from app.shared.responses import SuccessResponse + +# With data +response = SuccessResponse[User]( + success=True, + data=user, + message="User retrieved successfully" +) + +# Without data +response = SuccessResponse( + success=True, + message="Operation completed" +) +``` + +### DataResponse[T] + +Success response requiring data (not optional): + +```python +from app.shared.responses import DataResponse + +response = DataResponse[Product]( + data=product, + message="Product found" +) +``` + +### MessageResponse + +Simple success response without data: + +```python +from app.shared.responses import MessageResponse + +response = MessageResponse( + success=True, + message="Item deleted successfully" +) +``` + +## Error Responses + +### ErrorResponse + +Standardized error response with HTTP status codes: + +```python +from app.shared.responses import ErrorResponse + +response = ErrorResponse( + success=False, + message="User not found", + status_code=404, + error_code="USER_NOT_FOUND", + error_category="NOT_FOUND", + details={"user_id": "123"} +) +``` + +**Fields:** +- `status_code`: int (400-599) - HTTP status code +- `error_code`: str - Machine-readable error code +- `error_category`: str - Error category +- `details`: Optional[Dict] - Additional error context + +### Exception Integration + +Convert AppException to ErrorResponse automatically: + +```python +from app.shared.exceptions import NotFoundError +from app.shared.responses import ErrorResponse + +try: + user = get_user(user_id) +except NotFoundError as e: + # Automatic status code mapping + response = ErrorResponse.from_exception(e, request_id="req-123") + # status_code=404, error_code="RESOURCE_NOT_FOUND", etc. +``` + +**Status Code Mapping:** +- `NOT_FOUND` → 404 +- `VALIDATION` → 422 +- `AUTHENTICATION` → 401 +- `AUTHORIZATION` → 403 +- `BUSINESS_RULE` → 400 +- `DATABASE` → 500 +- `EXTERNAL_SERVICE` → 502 +- `INTERNAL` → 500 + +### ValidationErrorResponse + +Specialized for validation errors with field-level details: + +```python +from app.shared.responses import ValidationErrorResponse + +response = ValidationErrorResponse( + message="Validation failed", + validation_errors=[ + {"field": "email", "message": "Invalid format"}, + {"field": "age", "message": "Must be at least 18"} + ] +) +``` + +## Pagination + +### Page-Based Pagination + +Perfect for webshops and list views with numbered pages: + +```python +from app.shared.responses import PaginatedResponse, PageInfo + +response = PaginatedResponse[Product]( + success=True, + items=[product1, product2, product3], + page_info=PageInfo( + page=1, + size=20, + total=100, + pages=5 + ), + message="Products retrieved successfully" +) +``` + +**PageInfo Fields:** +- `page`: int - Current page (1-indexed) +- `size`: int - Items per page +- `total`: int - Total items across all pages +- `pages`: int - Total number of pages + +### Cursor-Based Pagination + +For infinite scrolling or real-time data: + +```python +from app.shared.responses import CursorPaginatedResponse, CursorInfo + +response = CursorPaginatedResponse[Post]( + success=True, + items=[post1, post2], + cursor_info=CursorInfo( + cursor="abc123", + has_next=True, + has_previous=False, + count=2 + ) +) +``` + +## Factory Functions + +Quick helper functions for common response patterns: + +### Success Responses + +```python +from app.shared.responses import success, data_response, message_response + +# Generic success with optional data +return success(data={"id": 1}, message="Created") + +# Success with required data +return data_response(data=user, message="User found") + +# Simple message only +return message_response("Operation completed") +``` + +### Error Responses + +```python +from app.shared.responses import error, error_from_exception, validation_error + +# Manual error +return error( + message="Not found", + status_code=404, + error_code="NOT_FOUND", + error_category="NOT_FOUND" +) + +# From exception +try: + ... +except AppException as e: + return error_from_exception(e, request_id="req-123") + +# Validation error +return validation_error( + message="Invalid input", + validation_errors=[{"field": "email", "message": "Required"}] +) +``` + +### Pagination + +```python +from app.shared.responses import paginated, cursor_paginated + +# Page-based (auto-calculates total pages) +return paginated( + items=products, + page=1, + size=20, + total=100 +) + +# Cursor-based +return cursor_paginated( + items=posts, + cursor="abc123", + has_next=True +) +``` + +### Convenience Aliases + +```python +from app.shared.responses import ok, created, accepted, not_found + +# HTTP 200 OK +return ok(data=user) + +# HTTP 201 Created +return created(data=new_user) + +# HTTP 404 Not Found +return not_found(message="User not found", ...) +``` + +## FastAPI Integration + +### Basic Endpoint + +```python +from fastapi import APIRouter, HTTPException +from app.shared.responses import success, error_from_exception +from app.shared.exceptions import NotFoundError + +router = APIRouter() + +@router.get("/users/{user_id}") +async def get_user(user_id: str): + try: + user = await db.get_user(user_id) + return success(data=user, message="User retrieved") + except NotFoundError as e: + return error_from_exception(e) +``` + +### With Response Models + +```python +from fastapi import APIRouter +from app.shared.responses import SuccessResponse, ErrorResponse + +@router.get( + "/users/{user_id}", + response_model=SuccessResponse[User], + responses={ + 404: {"model": ErrorResponse}, + 500: {"model": ErrorResponse} + } +) +async def get_user(user_id: str): + ... +``` + +### Paginated Endpoint + +```python +from fastapi import APIRouter, Query +from app.shared.responses import paginated + +@router.get("/products") +async def list_products( + page: int = Query(1, ge=1), + size: int = Query(20, ge=1, le=100) +): + items = await db.get_products(page=page, size=size) + total = await db.count_products() + + return paginated( + items=items, + page=page, + size=size, + total=total, + message="Products retrieved successfully" + ) +``` + +## Logger Integration + +The module optionally integrates with the Logger module for debugging: + +```python +# In error.py and factory.py +try: + from app.shared.logger import get_logger + _logger = get_logger(__name__) +except ImportError: + _logger = None + +# Used for debug logging in development +if _logger: + _logger.debug( + f"Creating ErrorResponse from {exception.__class__.__name__}", + extra={"error_code": exception.error_code.value} + ) +``` + +**When logs are generated:** +- Exception to response conversion (DEBUG level) +- Only in development/debug mode (checks `_settings.is_development`) +- Includes request_id for tracing + +## Config Integration + +Optional integration with Config module for environment-aware behavior: + +```python +try: + from app.shared.config import get_settings + _settings = get_settings() +except ImportError: + _settings = None + +# Conditional logging based on environment +if _settings and (_settings.is_development or _settings.debug): + _logger.debug("Converting exception to ErrorResponse") +``` + +## Best Practices + +### 1. Use Type Parameters + +```python +# ✅ Good - Type safe +response = SuccessResponse[User](data=user) + +# ❌ Bad - No type safety +response = SuccessResponse(data=user) +``` + +### 2. Use Factory Functions + +```python +# ✅ Good - Concise +return success(data=user) + +# ❌ Bad - Verbose +return SuccessResponse[User](success=True, data=user) +``` + +### 3. Include Request IDs + +```python +# ✅ Good - Traceable +return error_from_exception(e, request_id=request.headers.get("X-Request-ID")) + +# ❌ Bad - No tracing +return error_from_exception(e) +``` + +### 4. Add Context to Errors + +```python +# ✅ Good - Helpful details +return error( + message="User not found", + details={"user_id": user_id, "searched_by": "email"} +) + +# ❌ Bad - No context +return error(message="Not found") +``` + +### 5. Use Appropriate Status Codes + +```python +# ✅ Good - Let exception integration handle it +return error_from_exception(e) + +# ❌ Bad - Manual mapping can be wrong +return error(..., status_code=500) # Should be 404? +``` + +## Testing + +### Testing Success Responses + +```python +def test_success_response(): + response = success(data={"id": 1}, message="Success") + + assert response.success is True + assert response.data == {"id": 1} + assert response.message == "Success" + assert isinstance(response.timestamp, datetime) +``` + +### Testing Error Responses + +```python +def test_error_from_exception(): + exception = NotFoundError( + message="User not found", + context={"user_id": "123"} + ) + + response = ErrorResponse.from_exception(exception) + + assert response.success is False + assert response.status_code == 404 + assert response.error_code == "resource_not_found" + assert response.details["user_id"] == "123" +``` + +### Testing Pagination + +```python +def test_paginated_response(): + items = [{"id": i} for i in range(1, 21)] + response = paginated(items=items, page=1, size=20, total=100) + + assert len(response.items) == 20 + assert response.page_info.page == 1 + assert response.page_info.pages == 5 # Auto-calculated +``` + +## Migration Guide + +### From Plain Dicts + +```python +# Before +return { + "success": True, + "data": user, + "message": "User found" +} + +# After +return success(data=user, message="User found") +``` + +### From HTTPException + +```python +# Before +from fastapi import HTTPException + +if not user: + raise HTTPException(status_code=404, detail="User not found") + +# After +from app.shared.exceptions import NotFoundError +from app.shared.responses import error_from_exception + +if not user: + raise NotFoundError(message="User not found", context={"user_id": user_id}) +# In exception handler: +return error_from_exception(e) +``` + +## Common Patterns + +### CRUD Operations + +```python +# Create (201) +async def create_user(data: UserCreate): + user = await db.create_user(data) + return created(data=user, message="User created") + +# Read (200) +async def get_user(user_id: str): + user = await db.get_user(user_id) + return ok(data=user) + +# Update (200) +async def update_user(user_id: str, data: UserUpdate): + user = await db.update_user(user_id, data) + return success(data=user, message="User updated") + +# Delete (200) +async def delete_user(user_id: str): + await db.delete_user(user_id) + return message_response("User deleted successfully") +``` + +### Validation with Pydantic + +```python +from pydantic import ValidationError +from app.shared.responses import validation_error + +try: + user = UserCreate(**data) +except ValidationError as e: + validation_errors = [ + { + "field": err["loc"][0], + "message": err["msg"], + "type": err["type"] + } + for err in e.errors() + ] + return validation_error( + message="Invalid input", + validation_errors=validation_errors + ) +``` + +## Advanced Usage + +### Custom Metadata + +```python +return success( + data=user, + metadata={ + "version": "1.0", + "cache_hit": True, + "execution_time_ms": 45 + } +) +``` + +### Request Tracing + +```python +from fastapi import Request + +async def get_user(request: Request, user_id: str): + request_id = request.headers.get("X-Request-ID") + + try: + user = await db.get_user(user_id) + return success(data=user, request_id=request_id) + except Exception as e: + return error_from_exception(e, request_id=request_id) +``` + +### Streaming Pagination + +```python +async def list_items_stream(cursor: str = None): + items, next_cursor, has_more = await db.get_items_cursor(cursor) + + return cursor_paginated( + items=items, + cursor=next_cursor or cursor, + has_next=has_more, + has_previous=cursor is not None + ) +``` + +## Troubleshooting + +### Type Hints Not Working + +```python +# ❌ Problem +response = SuccessResponse(data=user) # Type[T] not inferred + +# ✅ Solution +response = SuccessResponse[User](data=user) +``` + +### Logger Not Available + +The module gracefully handles missing dependencies: + +```python +# Logger is optional - no error if not available +try: + from app.shared.logger import get_logger + _logger = get_logger(__name__) +except ImportError: + _logger = None # Module still works +``` + +### Timestamp Issues + +```python +# ✅ Uses datetime.now(UTC) - not deprecated +from datetime import datetime, UTC + +timestamp: datetime = Field( + default_factory=lambda: datetime.now(UTC) +) +``` + +## Performance Considerations + +1. **Response Serialization**: Pydantic v2 is very fast +2. **Logger Overhead**: Only logs in debug/development +3. **Factory Functions**: No performance penalty, just convenience +4. **Type Checking**: Happens at static analysis, not runtime + +## See Also + +- [Exception Module](./exceptions.md) - Exception system integration +- [Logger Module](./logger.md) - Logging integration +- [Config Module](./config.md) - Configuration integration +- [Testing Guide](./testing.md) - Testing strategies From f7a066ce8a65cca08f3716b16e0b31c1f8813e0b Mon Sep 17 00:00:00 2001 From: PhilippTheServer Date: Sun, 7 Dec 2025 13:37:03 +0100 Subject: [PATCH 51/51] docs: example shared moduls implementation --- docs/shared-modules.md | 1047 ++++++++++++++++++++++++++++++++++++++++ 1 file changed, 1047 insertions(+) create mode 100644 docs/shared-modules.md diff --git a/docs/shared-modules.md b/docs/shared-modules.md new file mode 100644 index 0000000..256ef01 --- /dev/null +++ b/docs/shared-modules.md @@ -0,0 +1,1047 @@ +# Shared Modules Guide + +Guide for using shared modules in feature development. + +## Overview + +The `app/shared/` directory contains reusable modules that provide common functionality across all features. This guide shows how to use them correctly in your services. + +``` +app/shared/ +├── config/ # Configuration management +├── logger/ # Structured logging +├── exceptions/ # Standardized error handling +└── responses/ # API response models +``` + +## Quick Start + +### Basic Feature Setup + +```python +# In your feature: src/app/services/my-feature/routers/items.py +from fastapi import APIRouter, HTTPException +from app.shared.logger import get_logger +from app.shared.config import get_settings +from app.shared.exceptions import NotFoundError, ValidationError +from app.shared.responses import success, error_from_exception, paginated + +# Initialize +logger = get_logger(__name__) +settings = get_settings() +router = APIRouter() + +@router.get("/items/{item_id}") +async def get_item(item_id: str): + logger.info("Fetching item", extra={"item_id": item_id}) + + try: + item = await fetch_item(item_id) + return success(data=item, message="Item retrieved") + except NotFoundError as e: + return error_from_exception(e) +``` + +## Configuration Module + +### Getting Settings + +```python +from app.shared.config import get_settings + +settings = get_settings() + +# Environment checks +if settings.is_production: + # Production-only logic + pass + +if settings.is_development: + # Development helpers + pass + +# Access settings +db_url = settings.database_url +debug_mode = settings.debug +api_name = settings.app_name +``` + +### Environment-Specific Behavior + +```python +from app.shared.config import get_settings + +settings = get_settings() + +# Cache settings based on environment +if settings.is_production: + cache_ttl = 3600 # 1 hour +else: + cache_ttl = 60 # 1 minute for testing + +# Debug logging +if settings.debug: + logger.debug("Detailed debug information") +``` + +### Secrets Management + +```python +from app.shared.config import get_settings + +settings = get_settings() + +# Secrets are automatically loaded from: +# 1. Docker secrets (/run/secrets/) +# 2. Kubernetes secrets (/var/run/secrets/) +# 3. Environment variables +# 4. .env file + +# Safe to use - never logs passwords +database_url = settings.database_url # From DATABASE_URL or secrets +redis_password = settings.redis_password # From secrets +``` + +### Best Practices + +```python +# ✅ Good - Singleton pattern, call once per module +from app.shared.config import get_settings +settings = get_settings() + +class ItemService: + def __init__(self): + self.cache_enabled = settings.cache_enabled + +# ❌ Bad - Don't call repeatedly +def process_item(): + if get_settings().debug: # Inefficient + ... +``` + +## Logger Module + +### Basic Logging + +```python +from app.shared.logger import get_logger + +logger = get_logger(__name__) + +# Different levels +logger.debug("Detailed debug info") +logger.info("General information") +logger.warning("Warning message") +logger.error("Error occurred") +``` + +### Structured Logging with Context + +```python +from app.shared.logger import get_logger + +logger = get_logger(__name__) + +# Add context with extra +logger.info( + "User created successfully", + extra={ + "user_id": user.id, + "email": user.email, + "ip_address": request.client.host + } +) + +# In production (LOG_FORMAT=json), outputs: +# { +# "timestamp": "2025-12-07T12:00:00Z", +# "level": "INFO", +# "message": "User created successfully", +# "user_id": "123", +# "email": "user@example.com", +# "ip_address": "192.168.1.1" +# } +``` + +### Sensitive Data Filtering + +```python +from app.shared.logger import get_logger + +logger = get_logger(__name__) + +# Automatically filters sensitive fields +logger.info( + "Payment processed", + extra={ + "user_id": "123", + "password": "secret123", # Filtered out! + "credit_card": "1234-5678", # Filtered out! + "ssn": "123-45-6789", # Filtered out! + "amount": 99.99 # OK + } +) + +# Output only includes: user_id, amount +# password, credit_card, ssn are automatically removed +``` + +### Request Context Logging + +```python +from app.shared.logger import get_logger, LoggerContext + +logger = get_logger(__name__) + +@router.post("/orders") +async def create_order(request: Request, data: OrderCreate): + # Set context for all logs in this request + with LoggerContext( + request_id=request.headers.get("X-Request-ID"), + user_id=current_user.id + ): + logger.info("Creating order") # Includes request_id & user_id + + order = await process_order(data) + + logger.info("Order created", extra={"order_id": order.id}) + # Also includes request_id & user_id automatically + + return success(data=order) +``` + +### Performance Logging + +```python +from app.shared.logger import get_logger + +logger = get_logger(__name__) + +@router.get("/heavy-operation") +async def heavy_operation(): + import time + start = time.time() + + result = await do_heavy_work() + + duration = time.time() - start + logger.info( + "Operation completed", + extra={ + "duration_ms": round(duration * 1000, 2), + "result_size": len(result) + } + ) + + return success(data=result) +``` + +### Exception Logging + +```python +from app.shared.logger import get_logger +from app.shared.exceptions import DatabaseError + +logger = get_logger(__name__) + +try: + result = await database.query(...) +except Exception as e: + # Log with exception info + logger.error( + "Database query failed", + extra={"query": "SELECT ...", "error": str(e)}, + exc_info=True # Includes stack trace + ) + raise DatabaseError( + message="Query failed", + context={"query": "SELECT ..."}, + original_exception=e + ) +``` + +### Best Practices + +```python +# ✅ Good - One logger per module +from app.shared.logger import get_logger +logger = get_logger(__name__) # Uses module name + +# ✅ Good - Structured logging +logger.info("Order processed", extra={"order_id": order.id, "amount": 99.99}) + +# ✅ Good - Use appropriate levels +logger.debug("Entering function") # Only in debug mode +logger.info("Business event") # Normal operations +logger.warning("Deprecation") # Warnings +logger.error("Failed operation") # Errors + +# ❌ Bad - String formatting in message +logger.info(f"Order {order.id} processed") # Use extra instead + +# ❌ Bad - Sensitive data in message +logger.info(f"User password: {password}") # Use extra, will be filtered + +# ❌ Bad - Too much logging +for item in items: + logger.info(f"Processing {item}") # Use batch logging +``` + +## Exception Module + +### Raising Exceptions + +```python +from app.shared.exceptions import ( + NotFoundError, + ValidationError, + DatabaseError, + AuthenticationError, + AuthorizationError, + BusinessRuleError +) + +# Not found +async def get_user(user_id: str): + user = await db.get_user(user_id) + if not user: + raise NotFoundError( + message=f"User {user_id} not found", + context={"user_id": user_id, "searched_by": "id"} + ) + return user + +# Validation +def create_user(data: dict): + if not data.get("email"): + raise ValidationError( + message="Email is required", + context={"field": "email", "value": None} + ) + +# Database errors +async def save_user(user): + try: + await db.save(user) + except DBConnectionError as e: + raise DatabaseError( + message="Failed to save user", + context={"user_id": user.id}, + original_exception=e + ) +``` + +### Using Helper Functions + +```python +from app.shared.exceptions import ( + entity_not_found, + missing_field, + invalid_format, + database_connection_error, + token_expired, + access_denied +) + +# Quick exception creation +def get_product(product_id: str): + product = db.get_product(product_id) + if not product: + raise entity_not_found("Product", product_id) + # Equivalent to: + # raise NotFoundError( + # message="Product not found", + # context={"entity_type": "Product", "entity_id": product_id} + # ) + +# Validation helpers +def validate_email(email: str): + if not "@" in email: + raise invalid_format("email", email, "Must contain @") + +# Authorization +def delete_item(item_id: str, user_id: str): + if not has_permission(user_id, "delete"): + raise access_denied("delete", "item", user_id) +``` + +### Exception Context + +```python +from app.shared.exceptions import NotFoundError + +# Add context for debugging +raise NotFoundError( + message="Order not found", + context={ + "order_id": order_id, + "user_id": current_user.id, + "search_criteria": {"status": "pending"}, + "timestamp": datetime.utcnow().isoformat() + } +) + +# Context is included in: +# 1. Error response details +# 2. Log messages (automatic) +# 3. Exception.to_dict() output +``` + +### Automatic Logging + +```python +from app.shared.exceptions import NotFoundError, DatabaseError + +# Exceptions automatically log based on severity: + +# Client errors (4xx) - WARNING level +raise NotFoundError("User not found") # Logs at WARNING +raise ValidationError("Invalid input") # Logs at WARNING + +# Server errors (5xx) - ERROR level +raise DatabaseError("Connection failed") # Logs at ERROR +raise InternalError("Unexpected error") # Logs at ERROR + +# Disable auto-logging if needed +raise NotFoundError("User not found", should_auto_log=False) +``` + +### Best Practices + +```python +# ✅ Good - Specific exception types +raise NotFoundError("User not found") + +# ✅ Good - Add context +raise ValidationError( + message="Invalid email", + context={"field": "email", "value": email} +) + +# ✅ Good - Preserve original exception +try: + await external_api.call() +except RequestException as e: + raise ExternalServiceError( + message="API call failed", + original_exception=e + ) + +# ❌ Bad - Generic exceptions +raise Exception("Something went wrong") + +# ❌ Bad - No context +raise NotFoundError("Not found") + +# ❌ Bad - Swallow exceptions +try: + ... +except Exception: + pass # Don't do this! +``` + +## Response Module + +### Success Responses + +```python +from app.shared.responses import success, data_response, message_response + +# Simple success +@router.get("/items/{item_id}") +async def get_item(item_id: str): + item = await db.get_item(item_id) + return success(data=item, message="Item retrieved") + +# Required data +@router.get("/users/{user_id}") +async def get_user(user_id: str): + user = await db.get_user(user_id) + return data_response(data=user, message="User found") + +# No data, just message +@router.delete("/items/{item_id}") +async def delete_item(item_id: str): + await db.delete_item(item_id) + return message_response("Item deleted successfully") +``` + +### Error Responses + +```python +from app.shared.responses import error_from_exception, validation_error +from app.shared.exceptions import NotFoundError, ValidationError + +@router.get("/items/{item_id}") +async def get_item(item_id: str): + try: + item = await db.get_item(item_id) + return success(data=item) + except NotFoundError as e: + # Automatic status code mapping + return error_from_exception(e) + # Returns: status_code=404, error_code="RESOURCE_NOT_FOUND" + +# Manual validation errors +@router.post("/items") +async def create_item(data: dict): + errors = validate_item(data) + if errors: + return validation_error( + message="Validation failed", + validation_errors=errors + ) + + item = await db.create_item(data) + return success(data=item, message="Item created") +``` + +### Pagination + +```python +from app.shared.responses import paginated + +@router.get("/products") +async def list_products( + page: int = Query(1, ge=1), + size: int = Query(20, ge=1, le=100) +): + # Get paginated data + products = await db.get_products(page=page, size=size) + total = await db.count_products() + + # Auto-calculates total pages + return paginated( + items=products, + page=page, + size=size, + total=total, + message="Products retrieved" + ) + # Returns: + # { + # "success": true, + # "items": [...], + # "page_info": { + # "page": 1, + # "size": 20, + # "total": 100, + # "pages": 5 + # } + # } +``` + +### Request Tracing + +```python +from fastapi import Request +from app.shared.responses import success, error_from_exception + +@router.get("/items/{item_id}") +async def get_item(request: Request, item_id: str): + request_id = request.headers.get("X-Request-ID") + + try: + item = await db.get_item(item_id) + return success( + data=item, + request_id=request_id, + metadata={"cache_hit": False} + ) + except Exception as e: + return error_from_exception(e, request_id=request_id) +``` + +### Best Practices + +```python +# ✅ Good - Use factory functions +return success(data=user) + +# ✅ Good - Include request IDs +return success(data=user, request_id=request_id) + +# ✅ Good - Let exception integration handle status codes +return error_from_exception(e) + +# ❌ Bad - Manual construction +return SuccessResponse[User](success=True, data=user, ...) + +# ❌ Bad - Wrong status codes +return error(..., status_code=500) # Should be 404? + +# ❌ Bad - No context +return error(message="Error") +``` + +## Combining All Modules + +### Complete Feature Example + +```python +from fastapi import APIRouter, Request, Query +from app.shared.logger import get_logger, LoggerContext +from app.shared.config import get_settings +from app.shared.exceptions import NotFoundError, ValidationError, entity_not_found +from app.shared.responses import ( + success, + error_from_exception, + paginated, + validation_error +) + +# Initialize +logger = get_logger(__name__) +settings = get_settings() +router = APIRouter() + +@router.get("/items/{item_id}") +async def get_item(request: Request, item_id: str): + """Get single item by ID.""" + request_id = request.headers.get("X-Request-ID") + + # Set logging context + with LoggerContext(request_id=request_id): + logger.info("Fetching item", extra={"item_id": item_id}) + + try: + # Business logic + item = await db.get_item(item_id) + + if not item: + raise entity_not_found("Item", item_id) + + # Cache in production + if settings.is_production and settings.cache_enabled: + await cache.set(f"item:{item_id}", item, ttl=300) + + logger.info("Item retrieved", extra={"item_id": item_id}) + + return success( + data=item, + message="Item retrieved successfully", + request_id=request_id + ) + + except NotFoundError as e: + logger.warning("Item not found", extra={"item_id": item_id}) + return error_from_exception(e, request_id=request_id) + + except Exception as e: + logger.error( + "Unexpected error", + extra={"item_id": item_id}, + exc_info=True + ) + raise + +@router.get("/items") +async def list_items( + request: Request, + page: int = Query(1, ge=1), + size: int = Query(20, ge=1, le=100), + category: str = Query(None) +): + """List items with pagination.""" + request_id = request.headers.get("X-Request-ID") + + with LoggerContext(request_id=request_id): + logger.info( + "Listing items", + extra={"page": page, "size": size, "category": category} + ) + + try: + # Get data + items = await db.get_items( + page=page, + size=size, + category=category + ) + total = await db.count_items(category=category) + + logger.info( + "Items retrieved", + extra={"count": len(items), "total": total} + ) + + return paginated( + items=items, + page=page, + size=size, + total=total, + request_id=request_id, + message=f"Retrieved {len(items)} items" + ) + + except Exception as e: + logger.error("Failed to list items", exc_info=True) + raise + +@router.post("/items") +async def create_item(request: Request, data: dict): + """Create new item.""" + request_id = request.headers.get("X-Request-ID") + + with LoggerContext(request_id=request_id): + logger.info("Creating item", extra={"data": data}) + + try: + # Validate + errors = validate_item_data(data) + if errors: + logger.warning("Validation failed", extra={"errors": errors}) + return validation_error( + message="Validation failed", + validation_errors=errors, + request_id=request_id + ) + + # Create + item = await db.create_item(data) + + logger.info( + "Item created", + extra={"item_id": item.id, "category": item.category} + ) + + return success( + data=item, + message="Item created successfully", + request_id=request_id, + metadata={"created_at": item.created_at.isoformat()} + ) + + except ValidationError as e: + return error_from_exception(e, request_id=request_id) + + except Exception as e: + logger.error("Failed to create item", exc_info=True) + raise +``` + +### Service Layer Example + +```python +from app.shared.logger import get_logger +from app.shared.config import get_settings +from app.shared.exceptions import DatabaseError, entity_not_found + +logger = get_logger(__name__) +settings = get_settings() + +class ItemService: + """Business logic for items.""" + + def __init__(self): + self.cache_enabled = settings.cache_enabled + self.cache_ttl = 300 if settings.is_production else 60 + + async def get_item(self, item_id: str) -> dict: + """Get item with caching.""" + logger.debug("Getting item", extra={"item_id": item_id}) + + # Check cache + if self.cache_enabled: + cached = await cache.get(f"item:{item_id}") + if cached: + logger.debug("Cache hit", extra={"item_id": item_id}) + return cached + + # Fetch from database + try: + item = await db.get_item(item_id) + except Exception as e: + raise DatabaseError( + message="Failed to fetch item", + context={"item_id": item_id}, + original_exception=e + ) + + if not item: + raise entity_not_found("Item", item_id) + + # Cache result + if self.cache_enabled: + await cache.set(f"item:{item_id}", item, ttl=self.cache_ttl) + + return item + + async def create_item(self, data: dict) -> dict: + """Create new item.""" + logger.info("Creating item", extra={"category": data.get("category")}) + + try: + item = await db.create_item(data) + + # Invalidate list cache + if self.cache_enabled: + await cache.delete("items:list:*") + + logger.info("Item created", extra={"item_id": item.id}) + return item + + except Exception as e: + logger.error("Failed to create item", exc_info=True) + raise DatabaseError( + message="Failed to create item", + context={"data": data}, + original_exception=e + ) +``` + +## Testing with Shared Modules + +### Testing with Config + +```python +import pytest +from app.shared.config import get_settings, clear_settings_cache + +def test_feature_in_production(): + """Test production behavior.""" + # Setup + clear_settings_cache() + settings = get_settings() + + # Assume production + assert settings.is_production + + # Test production logic + result = my_function() + assert result.cache_enabled is True + +def test_feature_in_development(): + """Test development behavior.""" + # Mock development + with patch.dict(os.environ, {"ENVIRONMENT": "development"}): + clear_settings_cache() + settings = get_settings() + + assert settings.is_development + + # Test debug logic + result = my_function() + assert result.debug_mode is True +``` + +### Testing with Logger + +```python +import pytest +from app.shared.logger import get_logger + +def test_logging(caplog): + """Test logging output.""" + logger = get_logger(__name__) + + with caplog.at_level("INFO"): + logger.info("Test message", extra={"key": "value"}) + + assert "Test message" in caplog.text + assert "key" in caplog.text +``` + +### Testing with Exceptions + +```python +import pytest +from app.shared.exceptions import NotFoundError + +def test_exception_handling(): + """Test exception is raised correctly.""" + with pytest.raises(NotFoundError) as exc_info: + get_nonexistent_item("invalid-id") + + assert "not found" in str(exc_info.value) + assert exc_info.value.context["item_id"] == "invalid-id" +``` + +### Testing with Responses + +```python +from app.shared.responses import success, error_from_exception +from app.shared.exceptions import NotFoundError + +def test_success_response(): + """Test success response format.""" + response = success(data={"id": 1}, message="Found") + + assert response.success is True + assert response.data == {"id": 1} + assert response.message == "Found" + +def test_error_response(): + """Test error response from exception.""" + exc = NotFoundError("Item not found", context={"id": "123"}) + response = error_from_exception(exc) + + assert response.success is False + assert response.status_code == 404 + assert response.error_code == "resource_not_found" +``` + +## Common Patterns + +### Health Check Endpoint + +```python +from fastapi import APIRouter +from app.shared.config import get_settings +from app.shared.responses import success + +router = APIRouter() +settings = get_settings() + +@router.get("/health") +async def health_check(): + """Health check endpoint.""" + return success( + data={ + "status": "healthy", + "environment": settings.environment, + "version": settings.app_version + }, + message="Service is healthy" + ) +``` + +### Error Handling Middleware + +```python +from fastapi import Request +from app.shared.logger import get_logger +from app.shared.exceptions import AppException +from app.shared.responses import error_from_exception + +logger = get_logger(__name__) + +@app.exception_handler(AppException) +async def app_exception_handler(request: Request, exc: AppException): + """Handle all application exceptions.""" + request_id = request.headers.get("X-Request-ID") + + logger.warning( + f"Application exception: {exc.message}", + extra={ + "error_code": exc.error_code.value, + "request_id": request_id, + "path": request.url.path + } + ) + + return error_from_exception(exc, request_id=request_id) +``` + +### Request Logging Middleware + +```python +from fastapi import Request +from app.shared.logger import get_logger, LoggerContext +import time + +logger = get_logger(__name__) + +@app.middleware("http") +async def log_requests(request: Request, call_next): + """Log all requests.""" + request_id = request.headers.get("X-Request-ID", str(uuid.uuid4())) + start_time = time.time() + + with LoggerContext(request_id=request_id): + logger.info( + "Request started", + extra={ + "method": request.method, + "path": request.url.path, + "client": request.client.host + } + ) + + response = await call_next(request) + + duration = time.time() - start_time + logger.info( + "Request completed", + extra={ + "method": request.method, + "path": request.url.path, + "status_code": response.status_code, + "duration_ms": round(duration * 1000, 2) + } + ) + + return response +``` + +## Troubleshooting + +### Logger Not Working + +```python +# ✅ Check logger is initialized +from app.shared.logger import get_logger +logger = get_logger(__name__) # Use __name__ + +# ✅ Check log level +from app.shared.config import get_settings +settings = get_settings() +print(f"Log level: {settings.log_level}") # Should be DEBUG/INFO/etc + +# ❌ Don't create logger directly +import logging +logger = logging.getLogger() # Don't do this +``` + +### Config Not Loading + +```python +# ✅ Check environment +from app.shared.config import get_settings +settings = get_settings() +print(f"Environment: {settings.environment}") + +# ✅ Check .env file exists +import os +print(f".env exists: {os.path.exists('.env')}") + +# ✅ Clear cache if needed +from app.shared.config import clear_settings_cache +clear_settings_cache() +settings = get_settings() # Reload +``` + +### Exceptions Not Logging + +```python +# ✅ Check auto-logging is enabled (default) +raise NotFoundError("Not found") # Automatically logs + +# ✅ Disable if needed +raise NotFoundError("Not found", should_auto_log=False) + +# ✅ Check log level +# WARNING level logs client errors (4xx) +# ERROR level logs server errors (5xx) +``` + +## Migration Checklist + +Moving from direct logging/exceptions to shared modules: + +- [ ] Replace `logging.getLogger()` with `get_logger(__name__)` +- [ ] Replace `os.getenv()` with `get_settings().{setting}` +- [ ] Replace `raise HTTPException` with `raise NotFoundError/ValidationError/etc` +- [ ] Replace dict responses with `success()`/`error_from_exception()` +- [ ] Add request_id to responses for tracing +- [ ] Use structured logging with `extra={}` instead of f-strings +- [ ] Add LoggerContext for request-scoped logging +- [ ] Update tests to use shared module helpers + +## See Also + +- [Config Module](./config.md) - Detailed configuration guide +- [Logger Module](./logger.md) - Advanced logging patterns +- [Exception Module](./exceptions.md) - All exception types +- [Response Module](./responses.md) - All response models +- [Testing Guide](./testing.md) - Testing strategies