foxhunt/services/api_gateway/src/lib.rs

//! API Gateway for Foxhunt HFT Trading System
//!
//! Provides zero-copy gRPC proxying with:
//! - RBAC authorization with sub-100ns cached permission checks
//! - <10μs routing overhead
//! - Connection pooling
//! - Circuit breaker pattern
//! - Health checking
//! - Performance monitoring
//! - Token bucket rate limiting with <50ns cache hits

// Include generated protobuf code FIRST (needed by other modules)
pub mod foxhunt {
    pub mod tli {
        tonic::include_proto!("foxhunt.tli");
    }
    pub mod config_proto {
        tonic::include_proto!("foxhunt.config");
    }
}

pub mod ml_training {
    tonic::include_proto!("ml_training");
}

// Error module MUST come before modules that use it
pub mod error;

// Now other modules can use error types and proto definitions
pub mod auth;
pub mod config;
pub mod grpc;
pub mod metrics;
pub mod routing;

// Re-export error types
pub use error::{ConfigError, ConfigResult};

// Re-export configuration management types
pub use config::{
    AuthzService, AuthzMetrics, PermissionResult, ConfigurationManager, ConfigurationServiceImpl,
    ConfigItem, ConfigValidator,
};

// Re-export routing and rate limiting types
pub use routing::{RateLimiter, RateLimitConfig, CacheStats};

// Re-export gRPC proxy types
pub use grpc::{
    TradingServiceProxy, HealthChecker,
    BacktestingServiceProxy,
    MlTrainingProxy, MlTrainingBackendConfig,
    setup_ml_training_proxy, setup_ml_training_client,
};