[router] grpc router bootstraps (#9759)

sgl-router/benches/request_processing.rs

@@ -7,7 +7,9 @@ use sglang_router_rs::protocols::spec::{
     ChatCompletionRequest, ChatMessage, CompletionRequest, GenerateParameters, GenerateRequest,
     SamplingParams, StringOrArray, UserMessageContent,
 };
-use sglang_router_rs::routers::pd_types::{generate_room_id, get_hostname, RequestWithBootstrap};
+use sglang_router_rs::routers::http::pd_types::{
+    generate_room_id, get_hostname, RequestWithBootstrap,
+};
 
 fn create_test_worker() -> BasicWorker {
     BasicWorker::new(

sgl-router/src/core/mod.rs

@@ -19,6 +19,6 @@ pub use circuit_breaker::{
 pub use error::{WorkerError, WorkerResult};
 pub use retry::{is_retryable_status, BackoffCalculator, RetryError, RetryExecutor};
 pub use worker::{
-    start_health_checker, BasicWorker, DPAwareWorker, HealthChecker, HealthConfig, Worker,
-    WorkerCollection, WorkerFactory, WorkerLoadGuard, WorkerType,
+    start_health_checker, BasicWorker, ConnectionMode, DPAwareWorker, HealthChecker, HealthConfig,
+    Worker, WorkerCollection, WorkerFactory, WorkerLoadGuard, WorkerType,
 };

sgl-router/src/core/worker.rs

@@ -24,6 +24,9 @@ pub trait Worker: Send + Sync + fmt::Debug {
     /// Get the worker's type (Regular, Prefill, or Decode)
     fn worker_type(&self) -> WorkerType;
 
+    /// Get the worker's connection mode (HTTP or gRPC)
+    fn connection_mode(&self) -> ConnectionMode;
+
     /// Check if the worker is currently healthy
     fn is_healthy(&self) -> bool;
 
@@ -152,6 +155,30 @@ pub trait Worker: Send + Sync + fmt::Debug {
     }
 }
 
+/// Connection mode for worker communication
+#[derive(Debug, Clone, PartialEq, Eq, Hash)]
+pub enum ConnectionMode {
+    /// HTTP/REST connection
+    Http,
+    /// gRPC connection
+    Grpc {
+        /// Optional port for gRPC endpoint (if different from URL)
+        port: Option<u16>,
+    },
+}
+
+impl fmt::Display for ConnectionMode {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        match self {
+            ConnectionMode::Http => write!(f, "HTTP"),
+            ConnectionMode::Grpc { port } => match port {
+                Some(p) => write!(f, "gRPC(port:{})", p),
+                None => write!(f, "gRPC"),
+            },
+        }
+    }
+}
+
 /// Worker type classification
 #[derive(Debug, Clone, PartialEq, Eq, Hash)]
 pub enum WorkerType {
@@ -213,6 +240,8 @@ pub struct WorkerMetadata {
     pub url: String,
     /// Worker type
     pub worker_type: WorkerType,
+    /// Connection mode
+    pub connection_mode: ConnectionMode,
     /// Additional labels/tags
     pub labels: std::collections::HashMap<String, String>,
     /// Health check configuration
@@ -233,9 +262,18 @@ pub struct BasicWorker {
 
 impl BasicWorker {
     pub fn new(url: String, worker_type: WorkerType) -> Self {
+        Self::with_connection_mode(url, worker_type, ConnectionMode::Http)
+    }
+
+    pub fn with_connection_mode(
+        url: String,
+        worker_type: WorkerType,
+        connection_mode: ConnectionMode,
+    ) -> Self {
         let metadata = WorkerMetadata {
             url: url.clone(),
             worker_type,
+            connection_mode,
             labels: std::collections::HashMap::new(),
             health_config: HealthConfig::default(),
         };
@@ -298,6 +336,10 @@ impl Worker for BasicWorker {
         self.metadata.worker_type.clone()
     }
 
+    fn connection_mode(&self) -> ConnectionMode {
+        self.metadata.connection_mode.clone()
+    }
+
     fn is_healthy(&self) -> bool {
         self.healthy.load(Ordering::Acquire)
     }
@@ -434,6 +476,10 @@ impl Worker for DPAwareWorker {
         self.base_worker.worker_type()
     }
 
+    fn connection_mode(&self) -> ConnectionMode {
+        self.base_worker.connection_mode()
+    }
+
     fn is_healthy(&self) -> bool {
         self.base_worker.is_healthy()
     }
@@ -603,6 +649,28 @@ impl WorkerFactory {
         (regular_workers, prefill_workers, decode_workers)
     }
 
+    /// Create a gRPC worker
+    pub fn create_grpc(url: String, worker_type: WorkerType, port: Option<u16>) -> Box<dyn Worker> {
+        Box::new(BasicWorker::with_connection_mode(
+            url,
+            worker_type,
+            ConnectionMode::Grpc { port },
+        ))
+    }
+
+    /// Create a gRPC worker with custom circuit breaker configuration
+    pub fn create_grpc_with_config(
+        url: String,
+        worker_type: WorkerType,
+        port: Option<u16>,
+        circuit_breaker_config: CircuitBreakerConfig,
+    ) -> Box<dyn Worker> {
+        Box::new(
+            BasicWorker::with_connection_mode(url, worker_type, ConnectionMode::Grpc { port })
+                .with_circuit_breaker_config(circuit_breaker_config),
+        )
+    }
+
     /// Create a DP-aware worker of specified type
     pub fn create_dp_aware(
         base_url: String,

sgl-router/src/routers/factory.rs

@@ -1,6 +1,9 @@
 //! Factory for creating router instances
 
-use super::{pd_router::PDRouter, router::Router, RouterTrait};
+use super::{
+    http::{pd_router::PDRouter, router::Router},
+    RouterTrait,
+};
 use crate::config::{PolicyConfig, RoutingMode};
 use crate::policies::PolicyFactory;
 use crate::server::AppContext;
@@ -17,7 +20,9 @@ impl RouterFactory {
             return Self::create_igw_router(ctx).await;
         }
 
-        // Default to proxy mode
+        // TODO: Add gRPC mode check here when implementing gRPC support
+
+        // Default to HTTP proxy mode
         match &ctx.router_config.mode {
             RoutingMode::Regular { worker_urls } => {
                 Self::create_regular_router(worker_urls, &ctx.router_config.policy, ctx).await
@@ -101,6 +106,29 @@ impl RouterFactory {
         Ok(Box::new(router))
     }
 
+    /// Create a gRPC router with injected policy
+    pub async fn create_grpc_router(
+        _worker_urls: &[String],
+        _policy_config: &PolicyConfig,
+        _ctx: &Arc<AppContext>,
+    ) -> Result<Box<dyn RouterTrait>, String> {
+        // For now, return an error as gRPC router is not yet implemented
+        Err("gRPC router is not yet implemented".to_string())
+    }
+
+    /// Create a gRPC PD router (placeholder for now)
+    pub async fn create_grpc_pd_router(
+        _prefill_urls: &[(String, Option<u16>)],
+        _decode_urls: &[String],
+        _prefill_policy_config: Option<&PolicyConfig>,
+        _decode_policy_config: Option<&PolicyConfig>,
+        _main_policy_config: &PolicyConfig,
+        _ctx: &Arc<AppContext>,
+    ) -> Result<Box<dyn RouterTrait>, String> {
+        // For now, return an error as gRPC PD router is not yet implemented
+        Err("gRPC PD router is not yet implemented".to_string())
+    }
+
     /// Create an IGW router (placeholder for future implementation)
     async fn create_igw_router(_ctx: &Arc<AppContext>) -> Result<Box<dyn RouterTrait>, String> {
         // For now, return an error indicating IGW is not yet implemented

sgl-router/src/routers/grpc/mod.rs

@@ -0,0 +1,4 @@
+//! gRPC router implementations
+
+pub mod pd_router;
+pub mod router;

sgl-router/src/routers/grpc/pd_router.rs

@@ -0,0 +1,110 @@
+// PD (Prefill-Decode) gRPC Router Implementation
+// TODO: Implement gRPC-based PD router for disaggregated prefill-decode systems
+
+use crate::routers::{RouterTrait, WorkerManagement};
+use async_trait::async_trait;
+use axum::{
+    body::Body,
+    extract::Request,
+    http::{HeaderMap, StatusCode},
+    response::{IntoResponse, Response},
+};
+
+/// Placeholder for gRPC PD router
+#[derive(Debug)]
+pub struct GrpcPDRouter;
+
+impl GrpcPDRouter {
+    pub async fn new() -> Result<Self, String> {
+        // TODO: Implement gRPC PD router initialization
+        Err("gRPC PD router not yet implemented".to_string())
+    }
+}
+
+#[async_trait]
+impl RouterTrait for GrpcPDRouter {
+    fn as_any(&self) -> &dyn std::any::Any {
+        self
+    }
+
+    async fn health(&self, _req: Request<Body>) -> Response {
+        (StatusCode::NOT_IMPLEMENTED).into_response()
+    }
+
+    async fn health_generate(&self, _req: Request<Body>) -> Response {
+        (StatusCode::NOT_IMPLEMENTED).into_response()
+    }
+
+    async fn get_server_info(&self, _req: Request<Body>) -> Response {
+        (StatusCode::NOT_IMPLEMENTED).into_response()
+    }
+
+    async fn get_models(&self, _req: Request<Body>) -> Response {
+        (StatusCode::NOT_IMPLEMENTED).into_response()
+    }
+
+    async fn get_model_info(&self, _req: Request<Body>) -> Response {
+        (StatusCode::NOT_IMPLEMENTED).into_response()
+    }
+
+    async fn route_generate(
+        &self,
+        _headers: Option<&HeaderMap>,
+        _body: &crate::protocols::spec::GenerateRequest,
+    ) -> Response {
+        (StatusCode::NOT_IMPLEMENTED).into_response()
+    }
+
+    async fn route_chat(
+        &self,
+        _headers: Option<&HeaderMap>,
+        _body: &crate::protocols::spec::ChatCompletionRequest,
+    ) -> Response {
+        (StatusCode::NOT_IMPLEMENTED).into_response()
+    }
+
+    async fn route_completion(
+        &self,
+        _headers: Option<&HeaderMap>,
+        _body: &crate::protocols::spec::CompletionRequest,
+    ) -> Response {
+        (StatusCode::NOT_IMPLEMENTED).into_response()
+    }
+
+    async fn route_embeddings(&self, _headers: Option<&HeaderMap>, _body: Body) -> Response {
+        (StatusCode::NOT_IMPLEMENTED).into_response()
+    }
+
+    async fn route_rerank(&self, _headers: Option<&HeaderMap>, _body: Body) -> Response {
+        (StatusCode::NOT_IMPLEMENTED).into_response()
+    }
+
+    async fn flush_cache(&self) -> Response {
+        (StatusCode::NOT_IMPLEMENTED).into_response()
+    }
+
+    async fn get_worker_loads(&self) -> Response {
+        (StatusCode::NOT_IMPLEMENTED).into_response()
+    }
+
+    fn router_type(&self) -> &'static str {
+        "grpc_pd"
+    }
+
+    fn readiness(&self) -> Response {
+        (StatusCode::SERVICE_UNAVAILABLE).into_response()
+    }
+}
+
+#[async_trait]
+impl WorkerManagement for GrpcPDRouter {
+    async fn add_worker(&self, _worker_url: &str) -> Result<String, String> {
+        Err("Not implemented".to_string())
+    }
+
+    fn remove_worker(&self, _worker_url: &str) {}
+
+    fn get_worker_urls(&self) -> Vec<String> {
+        vec![]
+    }
+}

sgl-router/src/routers/grpc/router.rs

@@ -0,0 +1,110 @@
+// gRPC Router Implementation
+// TODO: Implement gRPC-based router
+
+use crate::routers::{RouterTrait, WorkerManagement};
+use async_trait::async_trait;
+use axum::{
+    body::Body,
+    extract::Request,
+    http::{HeaderMap, StatusCode},
+    response::{IntoResponse, Response},
+};
+
+/// Placeholder for gRPC router
+#[derive(Debug)]
+pub struct GrpcRouter;
+
+impl GrpcRouter {
+    pub async fn new() -> Result<Self, String> {
+        // TODO: Implement gRPC router initialization
+        Err("gRPC router not yet implemented".to_string())
+    }
+}
+
+#[async_trait]
+impl RouterTrait for GrpcRouter {
+    fn as_any(&self) -> &dyn std::any::Any {
+        self
+    }
+
+    async fn health(&self, _req: Request<Body>) -> Response {
+        (StatusCode::NOT_IMPLEMENTED).into_response()
+    }
+
+    async fn health_generate(&self, _req: Request<Body>) -> Response {
+        (StatusCode::NOT_IMPLEMENTED).into_response()
+    }
+
+    async fn get_server_info(&self, _req: Request<Body>) -> Response {
+        (StatusCode::NOT_IMPLEMENTED).into_response()
+    }
+
+    async fn get_models(&self, _req: Request<Body>) -> Response {
+        (StatusCode::NOT_IMPLEMENTED).into_response()
+    }
+
+    async fn get_model_info(&self, _req: Request<Body>) -> Response {
+        (StatusCode::NOT_IMPLEMENTED).into_response()
+    }
+
+    async fn route_generate(
+        &self,
+        _headers: Option<&HeaderMap>,
+        _body: &crate::protocols::spec::GenerateRequest,
+    ) -> Response {
+        (StatusCode::NOT_IMPLEMENTED).into_response()
+    }
+
+    async fn route_chat(
+        &self,
+        _headers: Option<&HeaderMap>,
+        _body: &crate::protocols::spec::ChatCompletionRequest,
+    ) -> Response {
+        (StatusCode::NOT_IMPLEMENTED).into_response()
+    }
+
+    async fn route_completion(
+        &self,
+        _headers: Option<&HeaderMap>,
+        _body: &crate::protocols::spec::CompletionRequest,
+    ) -> Response {
+        (StatusCode::NOT_IMPLEMENTED).into_response()
+    }
+
+    async fn route_embeddings(&self, _headers: Option<&HeaderMap>, _body: Body) -> Response {
+        (StatusCode::NOT_IMPLEMENTED).into_response()
+    }
+
+    async fn route_rerank(&self, _headers: Option<&HeaderMap>, _body: Body) -> Response {
+        (StatusCode::NOT_IMPLEMENTED).into_response()
+    }
+
+    async fn flush_cache(&self) -> Response {
+        (StatusCode::NOT_IMPLEMENTED).into_response()
+    }
+
+    async fn get_worker_loads(&self) -> Response {
+        (StatusCode::NOT_IMPLEMENTED).into_response()
+    }
+
+    fn router_type(&self) -> &'static str {
+        "grpc"
+    }
+
+    fn readiness(&self) -> Response {
+        (StatusCode::SERVICE_UNAVAILABLE).into_response()
+    }
+}
+
+#[async_trait]
+impl WorkerManagement for GrpcRouter {
+    async fn add_worker(&self, _worker_url: &str) -> Result<String, String> {
+        Err("Not implemented".to_string())
+    }
+
+    fn remove_worker(&self, _worker_url: &str) {}
+
+    fn get_worker_urls(&self) -> Vec<String> {
+        vec![]
+    }
+}

sgl-router/src/routers/http/mod.rs

@@ -0,0 +1,5 @@
+//! HTTP router implementations
+
+pub mod pd_router;
+pub mod pd_types;
+pub mod router;

sgl-router/src/routers/http/pd_router.rs

@@ -1,6 +1,5 @@
 // PD (Prefill-Decode) Router Implementation
 // This module handles routing for disaggregated prefill-decode systems
-use super::header_utils;
 use super::pd_types::{api_path, PDRouterError};
 use crate::config::types::{
     CircuitBreakerConfig as ConfigCircuitBreakerConfig,
@@ -16,6 +15,7 @@ use crate::protocols::spec::{
     ChatCompletionRequest, ChatMessage, CompletionRequest, GenerateRequest, StringOrArray,
     UserMessageContent,
 };
+use crate::routers::header_utils;
 use crate::routers::{RouterTrait, WorkerManagement};
 use async_trait::async_trait;
 use axum::{
@@ -72,7 +72,7 @@ impl PDRouter {
 
     // Private helper method to perform health check on a new server
     async fn wait_for_server_health(&self, url: &str) -> Result<(), PDRouterError> {
-        crate::routers::router::Router::wait_for_healthy_workers(
+        crate::routers::http::router::Router::wait_for_healthy_workers(
             &[url.to_string()],
             self.timeout_secs,
             self.interval_secs,
@@ -435,7 +435,7 @@ impl PDRouter {
             .map(|worker| worker.url().to_string())
             .collect();
         if !all_urls.is_empty() {
-            crate::routers::router::Router::wait_for_healthy_workers(
+            crate::routers::http::router::Router::wait_for_healthy_workers(
                 &all_urls,
                 timeout_secs,
                 interval_secs,
@@ -1935,6 +1935,14 @@ impl RouterTrait for PDRouter {
         self.execute_dual_dispatch(headers, body, context).await
     }
 
+    async fn route_embeddings(&self, _headers: Option<&HeaderMap>, _body: Body) -> Response {
+        todo!()
+    }
+
+    async fn route_rerank(&self, _headers: Option<&HeaderMap>, _body: Body) -> Response {
+        todo!()
+    }
+
     async fn flush_cache(&self) -> Response {
         // Process both prefill and decode workers
         let (prefill_results, prefill_errors) = self
@@ -2040,7 +2048,7 @@ impl RouterTrait for PDRouter {
         let total_decode = self.decode_workers.read().unwrap().len();
 
         if healthy_prefill_count > 0 && healthy_decode_count > 0 {
-            Json(serde_json::json!({
+            Json(json!({
                 "status": "ready",
                 "prefill": {
                     "healthy": healthy_prefill_count,

sgl-router/src/routers/http/router.rs

@@ -1,4 +1,3 @@
-use super::header_utils;
 use crate::config::types::{
     CircuitBreakerConfig as ConfigCircuitBreakerConfig,
     HealthCheckConfig as ConfigHealthCheckConfig, RetryConfig,
@@ -12,6 +11,7 @@ use crate::policies::LoadBalancingPolicy;
 use crate::protocols::spec::{
     ChatCompletionRequest, CompletionRequest, GenerateRequest, GenerationRequest,
 };
+use crate::routers::header_utils;
 use crate::routers::{RouterTrait, WorkerManagement};
 use axum::{
     body::Body,
@@ -393,7 +393,7 @@ impl Router {
 
     // Helper method to proxy GET requests to the first available worker
     async fn proxy_get_request(&self, req: Request<Body>, endpoint: &str) -> Response {
-        let headers = super::header_utils::copy_request_headers(&req);
+        let headers = header_utils::copy_request_headers(&req);
 
         match self.select_first_worker() {
             Ok(worker_url) => {
@@ -667,7 +667,7 @@ impl Router {
 
         if !is_stream {
             // For non-streaming requests, preserve headers
-            let response_headers = super::header_utils::preserve_response_headers(res.headers());
+            let response_headers = header_utils::preserve_response_headers(res.headers());
 
             let response = match res.bytes().await {
                 Ok(body) => {
@@ -1198,6 +1198,14 @@ impl RouterTrait for Router {
             .await
     }
 
+    async fn route_embeddings(&self, _headers: Option<&HeaderMap>, _body: Body) -> Response {
+        todo!()
+    }
+
+    async fn route_rerank(&self, _headers: Option<&HeaderMap>, _body: Body) -> Response {
+        todo!()
+    }
+
     async fn flush_cache(&self) -> Response {
         // Get all worker URLs
         let worker_urls = self.get_worker_urls();

sgl-router/src/routers/mod.rs

@@ -12,10 +12,9 @@ use std::fmt::Debug;
 use crate::protocols::spec::{ChatCompletionRequest, CompletionRequest, GenerateRequest};
 
 pub mod factory;
+pub mod grpc;
 pub mod header_utils;
-pub mod pd_router;
-pub mod pd_types;
-pub mod router;
+pub mod http;
 
 pub use factory::RouterFactory;
 
@@ -77,6 +76,10 @@ pub trait RouterTrait: Send + Sync + Debug + WorkerManagement {
         body: &CompletionRequest,
     ) -> Response;
 
+    async fn route_embeddings(&self, headers: Option<&HeaderMap>, body: Body) -> Response;
+
+    async fn route_rerank(&self, headers: Option<&HeaderMap>, body: Body) -> Response;
+
     /// Flush cache on all workers
     async fn flush_cache(&self) -> Response;
 

sgl-router/src/service_discovery.rs

@@ -383,7 +383,7 @@ async fn handle_pod_event(
             // Handle PD mode with specific pod types
             let result = if pd_mode && pod_info.pod_type.is_some() {
                 // Need to import PDRouter type
-                use crate::routers::pd_router::PDRouter;
+                use crate::routers::http::pd_router::PDRouter;
 
                 // Try to downcast to PDRouter
                 if let Some(pd_router) = router.as_any().downcast_ref::<PDRouter>() {
@@ -453,7 +453,7 @@ async fn handle_pod_deletion(
 
         // Handle PD mode removal
         if pd_mode && pod_info.pod_type.is_some() {
-            use crate::routers::pd_router::PDRouter;
+            use crate::routers::http::pd_router::PDRouter;
 
             // Try to downcast to PDRouter for PD-specific removal
             if let Some(pd_router) = router.as_any().downcast_ref::<PDRouter>() {
@@ -581,7 +581,7 @@ mod tests {
     async fn create_test_router() -> Arc<dyn RouterTrait> {
         use crate::config::PolicyConfig;
         use crate::policies::PolicyFactory;
-        use crate::routers::router::Router;
+        use crate::routers::http::router::Router;
 
         let policy = PolicyFactory::create_from_config(&PolicyConfig::Random);
         let router = Router::new(

sgl-router/tests/test_pd_routing.rs

@@ -5,8 +5,8 @@ mod test_pd_routing {
         CircuitBreakerConfig, PolicyConfig, RetryConfig, RouterConfig, RoutingMode,
     };
     use sglang_router_rs::core::{WorkerFactory, WorkerType};
-    use sglang_router_rs::routers::pd_types::get_hostname;
-    use sglang_router_rs::routers::pd_types::PDSelectionPolicy;
+    use sglang_router_rs::routers::http::pd_types::get_hostname;
+    use sglang_router_rs::routers::http::pd_types::PDSelectionPolicy;
     use sglang_router_rs::routers::RouterFactory;
 
     // Test-only struct to help validate PD request parsing