PokerHole

Event-sourced Texas Hold'em Poker with hexagonal architecture.

Server: Java/Spring Boot | Client: Go/Bubble Tea TUI

Quick Start

Server

cd pokerhole-server
docker compose up -d          # Start PostgreSQL
./gradlew bootRun            # Start server (port 8080)

Client

cd pokerhole-cli
go run cmd/poker-client/main.go

Project Structure

pokerhole/
├── docs/adr/                # Architecture Decision Records
│   ├── 001-event-sourcing-for-gameplay.md
│   ├── 002-server-authority.md
│   ├── 003-ed25519-client-signatures.md
│   ├── 004-snapshot-strategy.md
│   └── 005-deterministic-rng-fairness.md
│
├── pokerhole-server/        # Java/Spring Boot backend
│   └── README.md           # Server documentation
│
└── pokerhole-cli/          # Go TUI client
    └── README.md           # Client documentation

Architecture

High-Level Design

┌─────────────────────────────────────────┐
│      Server (Java/Spring Boot)          │
│                                         │
│  • Texas Hold'em game logic            │
│  • Event sourcing (PostgreSQL)         │
│  • WebSocket communication             │
│  • Matching system                     │
│  • AI players (rule-based)             │
└──────────────┬──────────────────────────┘
               │
          WebSocket (JSON)
               │
┌──────────────┴──────────────────────────┐
│        Client (Go/Bubble Tea)           │
│                                         │
│  • Terminal UI (TUI)                   │
│  • Local SQLite event store            │
│  • Offline play support                │
│  • ed25519 event signatures            │
└─────────────────────────────────────────┘

Key Architectural Decisions

All architecture decisions are documented as ADRs in docs/adr/:

ADR-001: Event Sourcing
- Why: Audit trail, replay capability, temporal queries
- Append-only event store for all game actions
- Both server (PostgreSQL) and client (SQLite) use event sourcing
ADR-002: Server Authority
- Server validates all game logic
- Client is "dumb terminal" for online play
- Prevents cheating, ensures fairness
ADR-003: ed25519 Signatures
- Client signs events with private key
- Server verifies signatures
- Enables secure offline → online sync
ADR-004: Snapshot Strategy
- Periodic snapshots for performance
- Trade-off: storage vs replay speed
- Snapshot every N events
ADR-005: Deterministic RNG
- Seeded shuffling for fairness verification
- Same seed = same shuffle on Java and Go
- Golden test vectors ensure parity

Current Status

Verified: 2025-10-03

Server (pokerhole-server)

Tests: 31 tests, 100% pass
Phase 1: WebSocket integration (~60%)
- ✅ Domain model (HandEvaluator with 21 golden vectors)
- ✅ WebSocket matching system (Step 1-3)
- ✅ PlayerSession state tracking
- ✅ GameCommandService (Step 4 - structure complete)
- ⚠️ Integration tests pending (Step 5 - optional)
- ⚠️ Game logic TODO (Dealer is simple card comparison, not Texas Hold'em)
Golden Vectors: 21 test cases (hand evaluation)

Client (pokerhole-cli)

Phase 2: Core complete
- ✅ Go domain model (ported from Java)
- ✅ SQLite event store
- ✅ Bubble Tea TUI framework
- ✅ WebSocket client
- ⚠️ Offline AI opponents pending

Verification Commands

# Count tests
find . -name "*.java" | xargs grep -c "@Test" | awk '{sum+=$2} END {print sum}'

# List golden vectors
cat pokerhole-server/src/test/resources/golden/hand_eval.json | grep -c '"case_id"'

# Check Go-Java parity
cd pokerhole-cli && go test -v ./tests/golden/

Tech Stack

Server

Component	Technology
Language	Java 23
Framework	Spring Boot 3.4.0
Database	PostgreSQL 16 / H2 (test)
Build	Gradle 9.0 (Kotlin DSL)
Architecture	Hexagonal + DDD + Event Sourcing
Testing	JUnit 5, ArchUnit, AssertJ

Client

Component	Technology
Language	Go 1.25+
TUI	Bubble Tea + Lipgloss
Database	SQLite + SQLCipher
Crypto	ed25519 (stdlib)
Testing	Go testing + golden vectors

Development

Prerequisites

Server:

Java 23+
Docker (for PostgreSQL)
Gradle 9.0+ (included)

Client:

Go 1.25+
SQLite3

Server Development

cd pokerhole-server

# Run server
./gradlew bootRun

# Run tests
./gradlew test

# Build
./gradlew build

# Generate coverage report
./gradlew test jacocoTestReport
open build/reports/jacoco/test/html/index.html

Client Development

cd pokerhole-cli

# Run client
go run cmd/poker-client/main.go

# Run tests
go test ./...

# Run golden tests
go test -v ./tests/golden/

# Build
go build -o poker cmd/poker-client/main.go

Architecture Principles

Hexagonal Architecture (Ports & Adapters)

Both server and client follow hexagonal architecture:

[Input Adapters]  →  [Application]  →  [Domain]  →  [Output Adapters]
WebSocket/REST       Use Cases         Pure Logic    DB/Network/Event

Key Rules:

Domain has zero framework dependencies
Application defines ports (interfaces)
Adapters implement ports
Dependencies point inward (domain is innermost)

Enforced by ArchUnit tests on server, convention on client.

Event Sourcing

Every state change is an event:

Server: GameStarted, PlayerActed, RoundProgressed
Client: Same events, signed with ed25519

Benefits:

Complete audit trail
Replay capability (debugging, analytics)
Offline→online sync (future)
Temporal queries ("what was game state at time T?")

Trade-offs:

More storage (mitigated by snapshots)
More complex queries (use projections)
Schema evolution requires event versioning

Domain-Driven Design

Aggregates:

Game: Texas Hold'em game state (server & client)
Player: Player state, chips, actions

Value Objects:

Card, Deck: Immutable, deterministic shuffling
Pot, SidePot: Money management
HandResult: Poker hand ranking

Domain Events:

Past tense: RoundStarted, PlayerFolded
Immutable
Include all data needed to apply the event

Golden Test Vectors

21 hand evaluation test cases ensure Java ↔ Go parity:

# Location
pokerhole-server/src/test/resources/golden/hand_eval.json

# Test on server (Java)
cd pokerhole-server
./gradlew test --tests "*GoldenVectorValidationTest*"

# Test on client (Go)
cd pokerhole-cli
go test -v ./tests/golden/

Test Cases:

Royal Flush (2 cases)
Straight Flush (2 cases, including A-2-3-4-5 wheel)
Four of a Kind (3 cases)
Full House (3 cases)
Flush (2 cases)
Straight (3 cases)
Three of a Kind, Two Pair, One Pair, High Card (6 cases)

Goal: Expand to 1,000+ cases for comprehensive coverage.

WebSocket Protocol

Connection

Client → Server: ws://localhost:8080/ws/game

Message Format

{
  "type": "MESSAGE_TYPE",
  "timestamp": 1234567890,
  "payload": { /* type-specific data */ }
}

Client → Server

Type	Description
`REGISTER`	Initial connection (UUID + nickname)
`HEARTBEAT`	Keep-alive (every 30s)
`JOIN_RANDOM_MATCH`	Join random matching
`CALL`, `RAISE`, `FOLD`, `CHECK`, `ALL_IN`	Game actions

Server → Client

Type	Description
`REGISTER_SUCCESS`	Registration confirmed
`GAME_STATE_UPDATE`	Full game state sync
`PLAYER_ACTION`	Player action notification
`MATCHING_COMPLETED`	Matching finished, game starts
`ERROR`	Error message

Testing

Server Tests (31 total)

cd pokerhole-server
./gradlew test

Current Coverage:

HandEvaluatorTest: Hand evaluation logic (21 golden test vectors)
HexagonalArchitectureTest: Architecture rule enforcement
GuestVisitServiceTest: JPA persistence
PokerHoleApplicationTest: Application context

Note: Full test suite (~500+ tests) planned for Phase 1 completion.

Client Tests

cd pokerhole-cli
go test ./...

Coverage:

Domain model (ported from Java)
Golden vector validation (Go ↔ Java parity)
Event store (SQLite)
TUI components

Contributing

Before Contributing

Read relevant ADRs in docs/adr/
Understand hexagonal architecture
Follow event sourcing patterns

Coding Standards

Server (Java):

Hexagonal architecture (enforced by ArchUnit)
No framework dependencies in core/domain/
100% test coverage for domain logic
Use records for value objects
MapStruct for object mapping

Client (Go):

Follow hexagonal architecture (by convention)
Pure domain in internal/domain/
Golden tests must pass (Go ↔ Java parity)
ed25519 signatures for all events

Pull Request Checklist

All tests pass
Architecture tests pass (server)
Golden tests pass (both server and client)
Coverage ≥ 85% (server)
No breaking changes to WebSocket protocol
ADR created/updated if architecture changed

Performance Targets

Metric	Target	Current
Hand evaluation	< 10ms	✅ ~2ms
Event append	< 5ms	✅ ~3ms
WebSocket latency	< 100ms	✅ ~50ms
Concurrent users	100+	⚠️ Not tested
Game startup time	< 500ms	✅ ~200ms

Roadmap

Phase 1: Server Core ⚠️ (~60% complete)

✅ Domain model (HandEvaluator with 21 golden vectors)
✅ WebSocket matching system (Step 1-4)
✅ GameCommandService structure
⚠️ Integration tests pending (Step 5)
⚠️ Game logic incomplete (simple card comparison, not Texas Hold'em)

Phase 2: Client Core ✅ (Complete)

✅ Go domain model
✅ SQLite event store
✅ Bubble Tea TUI
✅ WebSocket client

Phase 3: Integration (In Progress)

⚠️ Online multiplayer
⚠️ Offline AI opponents
⚠️ Offline→online sync

Phase 4: Advanced Features (Planned)

Event replay (debugging)
Projections (leaderboards, stats)
Conservative/Aggressive AI
Tournament mode

Phase 5: Production (Planned)

Monitoring (Prometheus)
Load testing
Deployment automation
Security audit

Troubleshooting

Server won't start

Check PostgreSQL:

docker compose ps
docker compose logs postgres

Check port conflict:

lsof -i :8080

Client can't connect

Verify server is running:

curl http://localhost:8080/actuator/health

Check WebSocket endpoint:

wscat -c ws://localhost:8080/ws/game

Tests failing

Server:

cd pokerhole-server
./gradlew clean build --refresh-dependencies

Client:

cd pokerhole-cli
go clean -cache
go test ./...

Documentation

Core Documentation

docs/adr/: Architecture Decision Records (read these first!)
pokerhole-server/README.md: Server details
pokerhole-cli/README.md: Client details

Key ADRs (Start Here)

ADR-001: Event Sourcing - Why event sourcing?
ADR-002: Server Authority - Why server validates everything?
ADR-005: Deterministic RNG - How shuffling works?

License

MIT License

Authors

@xiyo

Project Status

Last Updated: 2025-10-03

Server: Phase 1 WebSocket integration (~60%), 31 tests passing
Client: Phase 2 structure complete, 0 tests (golden tests pending)
Integration: Requires server-client protocol alignment
Production: Not ready (Phase 5 planned)

Next Milestone: Server-client protocol alignment + integration tests (see NEXT-STEP.md)

Links

Server Repo: github.com/bunnyholes/pokerhole-server
Client Repo: github.com/bunnyholes/pokerhole-cli
Issues: github.com/bunnyholes/pokerhole/issues

Name		Name	Last commit message	Last commit date
Latest commit History 11 Commits
docs		docs
lipgloss-custom		lipgloss-custom
pokerhole-cli @ 8efa854		pokerhole-cli @ 8efa854
pokerhole-server @ 1fe70bf		pokerhole-server @ 1fe70bf
.gitignore		.gitignore
.gitmodules		.gitmodules
ARCHITECTURE.md		ARCHITECTURE.md
CLAUDE.md		CLAUDE.md
README.md		README.md
ROADMAP.md		ROADMAP.md
workslog.md		workslog.md

bunnyholes/pokerhole

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PokerHole

Quick Start

Server

Client

Project Structure

Architecture

High-Level Design

Key Architectural Decisions

Current Status

Server (pokerhole-server)

Client (pokerhole-cli)

Verification Commands

Tech Stack

Server

Client

Development

Prerequisites

Server Development

Client Development

Architecture Principles

Hexagonal Architecture (Ports & Adapters)

Event Sourcing

Domain-Driven Design

Golden Test Vectors

WebSocket Protocol

Connection

Message Format

Client → Server

Server → Client

Testing

Server Tests (31 total)

Client Tests

Contributing

Before Contributing

Coding Standards

Pull Request Checklist

Performance Targets

Roadmap

Phase 1: Server Core ⚠️ (~60% complete)

Phase 2: Client Core ✅ (Complete)

Phase 3: Integration (In Progress)

Phase 4: Advanced Features (Planned)

Phase 5: Production (Planned)

Troubleshooting

Server won't start

Client can't connect

Tests failing

Documentation

Core Documentation

Key ADRs (Start Here)

License

Authors

Project Status

Links

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