[WIP] refactor(sampling): move sampling to its own crate

Cargo.toml

@@ -3,6 +3,7 @@
 
 [workspace]
 members = [
+    "libdd-sampling",
     "datadog-opentelemetry",
     "datadog-opentelemetry/examples/propagator",
     "datadog-opentelemetry/examples/simple_tracing",

datadog-opentelemetry/Cargo.toml

@@ -10,6 +10,8 @@ readme.workspace = true
 authors.workspace = true
 
 [dependencies]
+# Internal dependencies
+libdd-sampling = { path = "../libdd-sampling" }
 
 # External dependencies
 foldhash = { workspace = true }

datadog-opentelemetry/src/core/configuration/configuration.rs

@@ -12,14 +12,14 @@ use std::{borrow::Cow, sync::OnceLock};
 
 use rustc_version_runtime::version;
 
-use crate::core::configuration::sampling_rule_config::{ParsedSamplingRules, SamplingRuleConfig};
 use crate::core::configuration::sources::{
     CompositeConfigSourceResult, CompositeSource, ConfigKey, ConfigSourceOrigin,
 };
 use crate::core::configuration::supported_configurations::SupportedConfigurations;
 use crate::core::log::LevelFilter;
 use crate::core::telemetry;
 use crate::{dd_error, dd_warn};
+use libdd_sampling::{ParsedSamplingRules, SamplingRuleConfig};
 
 /// Different types of remote configuration updates that can trigger callbacks
 #[derive(Debug, Clone)]

datadog-opentelemetry/src/core/configuration/mod.rs

@@ -22,10 +22,11 @@
 #[allow(clippy::module_inception)]
 mod configuration;
 pub(crate) mod remote_config;
-mod sampling_rule_config;
 mod sources;
 mod supported_configurations;
 
 pub use configuration::{Config, ConfigBuilder, OtlpProtocol, TracePropagationStyle};
 pub(crate) use configuration::{ConfigurationProvider, RemoteConfigUpdate};
-pub use sampling_rule_config::SamplingRuleConfig;
+
+// Re-export from libdd-sampling
+pub use libdd_sampling::SamplingRuleConfig;

datadog-opentelemetry/src/core/mod.rs

@@ -4,8 +4,9 @@
 //! Core components of the SDK
 
 pub mod configuration;
-pub(crate) mod constants;
-pub mod sampling;
+
+// Re-export from libdd-sampling
+pub use libdd_sampling::{dd_constants as constants, dd_sampling as sampling};
 
 mod error;
 

datadog-opentelemetry/src/sampling/mod.rs

@@ -3,22 +3,14 @@
 
 //! Datadog sampling logic
 
-pub(crate) mod agent_service_sampler;
-pub(crate) mod constants;
-pub(crate) mod datadog_sampler;
-pub(crate) mod glob_matcher;
 pub(crate) mod otel_mappings;
-pub(crate) mod rate_limiter;
-pub(crate) mod rate_sampler;
-pub(crate) mod rules_sampler;
-pub(crate) mod sampling_rule;
-mod types;
 pub(crate) mod utils;
 
+// Re-export from libdd-sampling
+pub use libdd_sampling::{
+    AttributeFactory, AttributeLike, DatadogSampler, SamplingData, SamplingRule,
+    SamplingRulesCallback, SpanProperties, TraceIdLike, ValueLike,
+};
+
 // Re-export key public types
-pub use datadog_sampler::{DatadogSampler, SamplingRulesCallback};
 pub use otel_mappings::{OtelAttributeFactory, OtelSamplingData};
-pub use sampling_rule::SamplingRule;
-pub use types::{
-    AttributeFactory, AttributeLike, SamplingData, SpanProperties, TraceIdLike, ValueLike,
-};