[router] add get server info and get model info in grpc server (#11303)

python/sglang/srt/entrypoints/grpc_server.py

@@ -5,6 +5,7 @@ Uses GrpcRequestManager for orchestration without tokenization.
 
 import argparse
 import asyncio
+import dataclasses
 import logging
 import multiprocessing as mp
 import os
@@ -15,8 +16,11 @@ from typing import AsyncIterator, Dict, Optional, Tuple
 
 import grpc
 from google.protobuf.json_format import MessageToDict
+from google.protobuf.struct_pb2 import Struct
+from google.protobuf.timestamp_pb2 import Timestamp
 from grpc_reflection.v1alpha import reflection
 
+import sglang
 from sglang.srt.disaggregation.utils import FAKE_BOOTSTRAP_HOST, DisaggregationMode
 from sglang.srt.entrypoints.grpc_request_manager import GrpcRequestManager
 from sglang.srt.grpc import sglang_scheduler_pb2, sglang_scheduler_pb2_grpc
@@ -173,11 +177,13 @@ class SGLangSchedulerServicer(sglang_scheduler_pb2_grpc.SglangSchedulerServicer)
         request_manager: GrpcRequestManager,
         server_args: ServerArgs,
         model_info: Dict,
+        scheduler_info: Dict,
     ):
         """Initialize the standalone gRPC service."""
         self.request_manager = request_manager
         self.server_args = server_args
         self.model_info = model_info
+        self.scheduler_info = scheduler_info
         self.start_time = time.time()
 
         # Start the request manager's event loop using auto_create_handle_loop
@@ -396,6 +402,89 @@ class SGLangSchedulerServicer(sglang_scheduler_pb2_grpc.SglangSchedulerServicer)
                 message=str(e),
             )
 
+    async def GetModelInfo(
+        self,
+        request: sglang_scheduler_pb2.GetModelInfoRequest,
+        context: grpc.aio.ServicerContext,
+    ) -> sglang_scheduler_pb2.GetModelInfoResponse:
+        """Get model information."""
+        logger.info("Model info request received")
+
+        is_generation = self.scheduler_info.get("is_generation")
+        if is_generation is None:
+            is_generation = not self.server_args.is_embedding
+
+        return sglang_scheduler_pb2.GetModelInfoResponse(
+            model_path=self.server_args.model_path,
+            tokenizer_path=self.server_args.tokenizer_path or "",
+            is_generation=is_generation,
+            preferred_sampling_params=(
+                self.server_args.preferred_sampling_params or ""
+            ),
+            weight_version=self.server_args.weight_version or "",
+            served_model_name=self.server_args.served_model_name,
+            max_context_length=self.model_info["max_context_length"],
+            vocab_size=self.model_info["vocab_size"],
+            supports_vision=self.model_info["supports_vision"],
+            model_type=self.model_info["model_type"],
+            eos_token_ids=self.model_info["eos_token_ids"],
+            pad_token_id=self.model_info["pad_token_id"],
+            bos_token_id=self.model_info["bos_token_id"],
+            max_req_input_len=self.model_info["max_req_input_len"],
+        )
+
+    async def GetServerInfo(
+        self,
+        request: sglang_scheduler_pb2.GetServerInfoRequest,
+        context: grpc.aio.ServicerContext,
+    ) -> sglang_scheduler_pb2.GetServerInfoResponse:
+        """Get server information."""
+        logger.info("Server info request received")
+
+        server_args_dict = dataclasses.asdict(self.server_args)
+        server_args_struct = Struct()
+
+        def make_serializable(obj):
+            if obj is None:
+                return None
+            elif isinstance(obj, (str, int, float, bool)):
+                return obj
+            elif isinstance(obj, (list, tuple, set)):
+                return [make_serializable(item) for item in obj]
+            elif isinstance(obj, dict):
+                return {k: make_serializable(v) for k, v in obj.items()}
+            else:
+                return str(obj)
+
+        serializable_args = make_serializable(server_args_dict)
+        server_args_struct.update(serializable_args)
+
+        # Convert scheduler_info to Struct
+        scheduler_info_struct = Struct()
+        scheduler_info_struct.update(self.scheduler_info)
+
+        # Get runtime state from request manager
+        manager_state = self.request_manager.get_server_info()
+
+        # Calculate uptime
+        uptime = time.time() - self.start_time
+
+        # Create timestamp
+        start_timestamp = Timestamp()
+        start_timestamp.FromSeconds(int(self.start_time))
+
+        return sglang_scheduler_pb2.GetServerInfoResponse(
+            server_args=server_args_struct,
+            scheduler_info=scheduler_info_struct,
+            active_requests=manager_state["active_requests"],
+            is_paused=manager_state["paused"],
+            last_receive_timestamp=manager_state["last_receive_time"],
+            uptime_seconds=uptime,
+            sglang_version=sglang.__version__,
+            server_type="grpc",
+            start_time=start_timestamp,
+        )
+
     # Helper methods for request/response conversion
 
     def _convert_generate_request(
@@ -756,6 +845,7 @@ async def serve_grpc(
         request_manager=request_manager,
         server_args=server_args,
         model_info=model_info,
+        scheduler_info=scheduler_info,
     )
     sglang_scheduler_pb2_grpc.add_SglangSchedulerServicer_to_server(servicer, server)
 

python/sglang/srt/grpc/sglang_scheduler.proto

@@ -20,6 +20,12 @@ service SglangScheduler {
   // Abort a running request
   rpc Abort(AbortRequest) returns (AbortResponse);
 
+  // Get model information
+  rpc GetModelInfo(GetModelInfoRequest) returns (GetModelInfoResponse);
+
+  // Get server information
+  rpc GetServerInfo(GetServerInfoRequest) returns (GetServerInfoResponse);
+
 }
 
 // =====================
@@ -401,3 +407,56 @@ message SetInternalStateResponse {
   bool success = 1;
   string message = 2;
 }
+
+// =====================
+// Model and Server Info
+// =====================
+
+// Get model information
+message GetModelInfoRequest {}
+
+message GetModelInfoResponse {
+  string model_path = 1;
+  string tokenizer_path = 2;
+  bool is_generation = 3;
+  string preferred_sampling_params = 4;  // JSON string or empty
+  string weight_version = 5;
+  string served_model_name = 6;
+  int32 max_context_length = 7;
+  int32 vocab_size = 8;
+  bool supports_vision = 9;
+  string model_type = 10;
+  repeated int32 eos_token_ids = 11;
+  int32 pad_token_id = 12;
+  int32 bos_token_id = 13;
+  int32 max_req_input_len = 14;
+}
+
+// Get server information
+message GetServerInfoRequest {}
+
+message GetServerInfoResponse {
+  // Server configuration (as structured data)
+  google.protobuf.Struct server_args = 1;
+
+  // Scheduler metrics (from scheduler initialization)
+  google.protobuf.Struct scheduler_info = 2;
+
+  // Runtime state
+  int32 active_requests = 3;
+  bool is_paused = 4;
+  double last_receive_timestamp = 5;
+  double uptime_seconds = 6;
+
+  // Version info
+  string sglang_version = 7;
+
+  // Server metadata
+  string server_type = 8;  // "grpc"
+  google.protobuf.Timestamp start_time = 9;
+
+  // Note: internal_states not provided in gRPC mode
+  // Scheduler-side metrics (memory usage, throughput) require
+  // bidirectional communicator infrastructure not available in gRPC.
+  // Use HTTP /get_server_info if scheduler internal state is needed.
+}

python/sglang/srt/grpc/sglang_scheduler_pb2.pyi

@@ -428,3 +428,65 @@ class SetInternalStateResponse(_message.Message):
     success: bool
     message: str
     def __init__(self, success: bool = ..., message: _Optional[str] = ...) -> None: ...
+
+class GetModelInfoRequest(_message.Message):
+    __slots__ = ()
+    def __init__(self) -> None: ...
+
+class GetModelInfoResponse(_message.Message):
+    __slots__ = ("model_path", "tokenizer_path", "is_generation", "preferred_sampling_params", "weight_version", "served_model_name", "max_context_length", "vocab_size", "supports_vision", "model_type", "eos_token_ids", "pad_token_id", "bos_token_id", "max_req_input_len")
+    MODEL_PATH_FIELD_NUMBER: _ClassVar[int]
+    TOKENIZER_PATH_FIELD_NUMBER: _ClassVar[int]
+    IS_GENERATION_FIELD_NUMBER: _ClassVar[int]
+    PREFERRED_SAMPLING_PARAMS_FIELD_NUMBER: _ClassVar[int]
+    WEIGHT_VERSION_FIELD_NUMBER: _ClassVar[int]
+    SERVED_MODEL_NAME_FIELD_NUMBER: _ClassVar[int]
+    MAX_CONTEXT_LENGTH_FIELD_NUMBER: _ClassVar[int]
+    VOCAB_SIZE_FIELD_NUMBER: _ClassVar[int]
+    SUPPORTS_VISION_FIELD_NUMBER: _ClassVar[int]
+    MODEL_TYPE_FIELD_NUMBER: _ClassVar[int]
+    EOS_TOKEN_IDS_FIELD_NUMBER: _ClassVar[int]
+    PAD_TOKEN_ID_FIELD_NUMBER: _ClassVar[int]
+    BOS_TOKEN_ID_FIELD_NUMBER: _ClassVar[int]
+    MAX_REQ_INPUT_LEN_FIELD_NUMBER: _ClassVar[int]
+    model_path: str
+    tokenizer_path: str
+    is_generation: bool
+    preferred_sampling_params: str
+    weight_version: str
+    served_model_name: str
+    max_context_length: int
+    vocab_size: int
+    supports_vision: bool
+    model_type: str
+    eos_token_ids: _containers.RepeatedScalarFieldContainer[int]
+    pad_token_id: int
+    bos_token_id: int
+    max_req_input_len: int
+    def __init__(self, model_path: _Optional[str] = ..., tokenizer_path: _Optional[str] = ..., is_generation: bool = ..., preferred_sampling_params: _Optional[str] = ..., weight_version: _Optional[str] = ..., served_model_name: _Optional[str] = ..., max_context_length: _Optional[int] = ..., vocab_size: _Optional[int] = ..., supports_vision: bool = ..., model_type: _Optional[str] = ..., eos_token_ids: _Optional[_Iterable[int]] = ..., pad_token_id: _Optional[int] = ..., bos_token_id: _Optional[int] = ..., max_req_input_len: _Optional[int] = ...) -> None: ...
+
+class GetServerInfoRequest(_message.Message):
+    __slots__ = ()
+    def __init__(self) -> None: ...
+
+class GetServerInfoResponse(_message.Message):
+    __slots__ = ("server_args", "scheduler_info", "active_requests", "is_paused", "last_receive_timestamp", "uptime_seconds", "sglang_version", "server_type", "start_time")
+    SERVER_ARGS_FIELD_NUMBER: _ClassVar[int]
+    SCHEDULER_INFO_FIELD_NUMBER: _ClassVar[int]
+    ACTIVE_REQUESTS_FIELD_NUMBER: _ClassVar[int]
+    IS_PAUSED_FIELD_NUMBER: _ClassVar[int]
+    LAST_RECEIVE_TIMESTAMP_FIELD_NUMBER: _ClassVar[int]
+    UPTIME_SECONDS_FIELD_NUMBER: _ClassVar[int]
+    SGLANG_VERSION_FIELD_NUMBER: _ClassVar[int]
+    SERVER_TYPE_FIELD_NUMBER: _ClassVar[int]
+    START_TIME_FIELD_NUMBER: _ClassVar[int]
+    server_args: _struct_pb2.Struct
+    scheduler_info: _struct_pb2.Struct
+    active_requests: int
+    is_paused: bool
+    last_receive_timestamp: float
+    uptime_seconds: float
+    sglang_version: str
+    server_type: str
+    start_time: _timestamp_pb2.Timestamp
+    def __init__(self, server_args: _Optional[_Union[_struct_pb2.Struct, _Mapping]] = ..., scheduler_info: _Optional[_Union[_struct_pb2.Struct, _Mapping]] = ..., active_requests: _Optional[int] = ..., is_paused: bool = ..., last_receive_timestamp: _Optional[float] = ..., uptime_seconds: _Optional[float] = ..., sglang_version: _Optional[str] = ..., server_type: _Optional[str] = ..., start_time: _Optional[_Union[datetime.datetime, _timestamp_pb2.Timestamp, _Mapping]] = ...) -> None: ...

python/sglang/srt/grpc/sglang_scheduler_pb2_grpc.py

@@ -59,6 +59,16 @@ class SglangSchedulerStub(object):
                 request_serializer=sglang__scheduler__pb2.AbortRequest.SerializeToString,
                 response_deserializer=sglang__scheduler__pb2.AbortResponse.FromString,
                 _registered_method=True)
+        self.GetModelInfo = channel.unary_unary(
+                '/sglang.grpc.scheduler.SglangScheduler/GetModelInfo',
+                request_serializer=sglang__scheduler__pb2.GetModelInfoRequest.SerializeToString,
+                response_deserializer=sglang__scheduler__pb2.GetModelInfoResponse.FromString,
+                _registered_method=True)
+        self.GetServerInfo = channel.unary_unary(
+                '/sglang.grpc.scheduler.SglangScheduler/GetServerInfo',
+                request_serializer=sglang__scheduler__pb2.GetServerInfoRequest.SerializeToString,
+                response_deserializer=sglang__scheduler__pb2.GetServerInfoResponse.FromString,
+                _registered_method=True)
 
 
 class SglangSchedulerServicer(object):
@@ -94,6 +104,20 @@ class SglangSchedulerServicer(object):
         context.set_details('Method not implemented!')
         raise NotImplementedError('Method not implemented!')
 
+    def GetModelInfo(self, request, context):
+        """Get model information
+        """
+        context.set_code(grpc.StatusCode.UNIMPLEMENTED)
+        context.set_details('Method not implemented!')
+        raise NotImplementedError('Method not implemented!')
+
+    def GetServerInfo(self, request, context):
+        """Get server information
+        """
+        context.set_code(grpc.StatusCode.UNIMPLEMENTED)
+        context.set_details('Method not implemented!')
+        raise NotImplementedError('Method not implemented!')
+
 
 def add_SglangSchedulerServicer_to_server(servicer, server):
     rpc_method_handlers = {
@@ -117,6 +141,16 @@ def add_SglangSchedulerServicer_to_server(servicer, server):
                     request_deserializer=sglang__scheduler__pb2.AbortRequest.FromString,
                     response_serializer=sglang__scheduler__pb2.AbortResponse.SerializeToString,
             ),
+            'GetModelInfo': grpc.unary_unary_rpc_method_handler(
+                    servicer.GetModelInfo,
+                    request_deserializer=sglang__scheduler__pb2.GetModelInfoRequest.FromString,
+                    response_serializer=sglang__scheduler__pb2.GetModelInfoResponse.SerializeToString,
+            ),
+            'GetServerInfo': grpc.unary_unary_rpc_method_handler(
+                    servicer.GetServerInfo,
+                    request_deserializer=sglang__scheduler__pb2.GetServerInfoRequest.FromString,
+                    response_serializer=sglang__scheduler__pb2.GetServerInfoResponse.SerializeToString,
+            ),
     }
     generic_handler = grpc.method_handlers_generic_handler(
             'sglang.grpc.scheduler.SglangScheduler', rpc_method_handlers)
@@ -237,3 +271,57 @@ class SglangScheduler(object):
             timeout,
             metadata,
             _registered_method=True)
+
+    @staticmethod
+    def GetModelInfo(request,
+            target,
+            options=(),
+            channel_credentials=None,
+            call_credentials=None,
+            insecure=False,
+            compression=None,
+            wait_for_ready=None,
+            timeout=None,
+            metadata=None):
+        return grpc.experimental.unary_unary(
+            request,
+            target,
+            '/sglang.grpc.scheduler.SglangScheduler/GetModelInfo',
+            sglang__scheduler__pb2.GetModelInfoRequest.SerializeToString,
+            sglang__scheduler__pb2.GetModelInfoResponse.FromString,
+            options,
+            channel_credentials,
+            insecure,
+            call_credentials,
+            compression,
+            wait_for_ready,
+            timeout,
+            metadata,
+            _registered_method=True)
+
+    @staticmethod
+    def GetServerInfo(request,
+            target,
+            options=(),
+            channel_credentials=None,
+            call_credentials=None,
+            insecure=False,
+            compression=None,
+            wait_for_ready=None,
+            timeout=None,
+            metadata=None):
+        return grpc.experimental.unary_unary(
+            request,
+            target,
+            '/sglang.grpc.scheduler.SglangScheduler/GetServerInfo',
+            sglang__scheduler__pb2.GetServerInfoRequest.SerializeToString,
+            sglang__scheduler__pb2.GetServerInfoResponse.FromString,
+            options,
+            channel_credentials,
+            insecure,
+            call_credentials,
+            compression,
+            wait_for_ready,
+            timeout,
+            metadata,
+            _registered_method=True)

sgl-router/src/grpc_client/sglang_scheduler.rs

@@ -97,6 +97,30 @@ impl SglangSchedulerClient {
         Ok(())
     }
 
+    /// Get model information
+    pub async fn get_model_info(
+        &mut self,
+    ) -> Result<proto::GetModelInfoResponse, Box<dyn std::error::Error + Send + Sync>> {
+        debug!("Requesting model info");
+        let request = Request::new(proto::GetModelInfoRequest {});
+
+        let response = self.client.get_model_info(request).await?;
+        debug!("Model info response received");
+        Ok(response.into_inner())
+    }
+
+    /// Get server information
+    pub async fn get_server_info(
+        &mut self,
+    ) -> Result<proto::GetServerInfoResponse, Box<dyn std::error::Error + Send + Sync>> {
+        debug!("Requesting server info");
+        let request = Request::new(proto::GetServerInfoRequest {});
+
+        let response = self.client.get_server_info(request).await?;
+        debug!("Server info response received");
+        Ok(response.into_inner())
+    }
+
     /// Build a single SGLang GenerateRequest from OpenAI ChatCompletionRequest
     pub fn build_generate_request(
         &self,

sgl-router/src/proto/sglang_scheduler.proto

@@ -20,6 +20,12 @@ service SglangScheduler {
   // Abort a running request
   rpc Abort(AbortRequest) returns (AbortResponse);
 
+  // Get model information
+  rpc GetModelInfo(GetModelInfoRequest) returns (GetModelInfoResponse);
+
+  // Get server information
+  rpc GetServerInfo(GetServerInfoRequest) returns (GetServerInfoResponse);
+
 }
 
 // =====================
@@ -401,3 +407,56 @@ message SetInternalStateResponse {
   bool success = 1;
   string message = 2;
 }
+
+// =====================
+// Model and Server Info
+// =====================
+
+// Get model information
+message GetModelInfoRequest {}
+
+message GetModelInfoResponse {
+  string model_path = 1;
+  string tokenizer_path = 2;
+  bool is_generation = 3;
+  string preferred_sampling_params = 4;  // JSON string or empty
+  string weight_version = 5;
+  string served_model_name = 6;
+  int32 max_context_length = 7;
+  int32 vocab_size = 8;
+  bool supports_vision = 9;
+  string model_type = 10;
+  repeated int32 eos_token_ids = 11;
+  int32 pad_token_id = 12;
+  int32 bos_token_id = 13;
+  int32 max_req_input_len = 14;
+}
+
+// Get server information
+message GetServerInfoRequest {}
+
+message GetServerInfoResponse {
+  // Server configuration (as structured data)
+  google.protobuf.Struct server_args = 1;
+
+  // Scheduler metrics (from scheduler initialization)
+  google.protobuf.Struct scheduler_info = 2;
+
+  // Runtime state
+  int32 active_requests = 3;
+  bool is_paused = 4;
+  double last_receive_timestamp = 5;
+  double uptime_seconds = 6;
+
+  // Version info
+  string sglang_version = 7;
+
+  // Server metadata
+  string server_type = 8;  // "grpc"
+  google.protobuf.Timestamp start_time = 9;
+
+  // Note: internal_states not provided in gRPC mode
+  // Scheduler-side metrics (memory usage, throughput) require
+  // bidirectional communicator infrastructure not available in gRPC.
+  // Use HTTP /get_server_info if scheduler internal state is needed.
+}