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");
}

// Trading Agent Service proto (for proxy)
pub mod trading_agent {
    tonic::include_proto!("trading_agent");
}

// Trading Service backend proto (for protocol translation)
pub mod trading_backend {
    tonic::include_proto!("trading");
}

// Risk Service backend proto
pub mod risk {
    tonic::include_proto!("risk");
}

// Monitoring Service backend proto
pub mod monitoring {
    tonic::include_proto!("monitoring");
}

// Config Service backend proto
pub mod config_backend {
    tonic::include_proto!("config");
}

// 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 handlers;
pub mod health_router;
pub mod metrics;
pub mod routing;

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

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

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

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

// Re-export health router types
pub use health_router::{health_router, HealthState};

// Re-export REST API handlers
pub use handlers::{
    jwt_auth_middleware, ml_router, AuthMiddlewareState, BatchPredictRequest, BatchPredictResponse,
    HotSwapRequest, HotSwapResponse, MlHandlerState, ModelStatusResponse, PredictRequest,
    PredictResponse,
};