Simplify `Router` arguments passing and build it in docker image (#9964)

docker/Dockerfile

@@ -36,7 +36,7 @@ RUN echo 'tzdata tzdata/Areas select America' | debconf-set-selections \
     ibverbs-providers infiniband-diags perftest \
     libgoogle-glog-dev libgtest-dev libjsoncpp-dev libunwind-dev \
     libboost-all-dev libssl-dev \
-    libgrpc-dev libgrpc++-dev libprotobuf-dev protobuf-compiler-grpc \
+    libgrpc-dev libgrpc++-dev libprotobuf-dev protobuf-compiler protobuf-compiler-grpc \
     pybind11-dev \
     libhiredis-dev libcurl4-openssl-dev \
     libczmq4 libczmq-dev \
@@ -218,6 +218,19 @@ RUN wget https://github.com/Kitware/CMake/releases/download/v3.31.1/cmake-3.31.1
     && cp -r cmake-3.31.1-linux-x86_64/share/* /usr/local/share/ \
     && rm -rf cmake-3.31.1-linux-x86_64 cmake-3.31.1-linux-x86_64.tar.gz
 
+# Install Rust toolchain for sgl-router
+ENV PATH="/root/.cargo/bin:${PATH}"
+RUN curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh -s -- -y \
+    && rustc --version && cargo --version
+
+# Build and install sgl-router
+RUN python3 -m pip install --no-cache-dir setuptools-rust \
+    && cd /sgl-workspace/sglang/sgl-router \
+    && cargo build --release \
+    && python3 -m pip install --no-cache-dir . \
+    && rm -rf /root/.cache
+
+
 # Add yank script
 COPY --chown=root:root <<-"EOF" /usr/local/bin/yank
 #!/bin/bash

docs/advanced_features/pd_disaggregation.md

@@ -36,7 +36,7 @@ uv pip install mooncake-transfer-engine
 ```bash
 $ python -m sglang.launch_server --model-path meta-llama/Llama-3.1-8B-Instruct --disaggregation-mode prefill --disaggregation-ib-device mlx5_roce0
 $ python -m sglang.launch_server --model-path meta-llama/Llama-3.1-8B-Instruct --disaggregation-mode decode --port 30001 --base-gpu-id 1 --disaggregation-ib-device mlx5_roce0
-$ python -m sglang.srt.disaggregation.mini_lb --prefill http://127.0.0.1:30000 --decode http://127.0.0.1:30001 --host 0.0.0.0 --port 8000
+$ python -m sglang_router.launch_router --pd-disaggregation --prefill http://127.0.0.1:30000 --decode http://127.0.0.1:30001 --host 0.0.0.0 --port 8000
 ```
 
 ### DeepSeek Multi-Node
@@ -100,7 +100,7 @@ pip install . --config-settings=setup-args="-Ducx_path=/path/to/ucx"
 ```bash
 $ python -m sglang.launch_server --model-path meta-llama/Llama-3.1-8B-Instruct --disaggregation-mode prefill --disaggregation-transfer-backend nixl
 $ python -m sglang.launch_server --model-path meta-llama/Llama-3.1-8B-Instruct --disaggregation-mode decode --port 30001 --base-gpu-id 1 --disaggregation-transfer-backend nixl
-$ python -m sglang.srt.disaggregation.mini_lb --prefill http://127.0.0.1:30000 --decode http://127.0.0.1:30001 --host 0.0.0.0 --port 8000
+$ python -m sglang_router.launch_router --pd-disaggregation --prefill http://127.0.0.1:30000 --decode http://127.0.0.1:30001 --host 0.0.0.0 --port 8000
 ```
 
 ### DeepSeek Multi-Node
@@ -137,7 +137,7 @@ export ENABLE_ASCEND_TRANSFER_WITH_MOONCAKE=true
 ```bash
 $ python -m sglang.launch_server --model-path meta-llama/Llama-3.1-8B-Instruct --disaggregation-mode prefill --disaggregation-transfer-backend ascend
 $ python -m sglang.launch_server --model-path meta-llama/Llama-3.1-8B-Instruct --disaggregation-mode decode --port 30001 --base-gpu-id 1 --disaggregation-transfer-backend ascend
-$ python -m sglang.srt.disaggregation.mini_lb --prefill http://127.0.0.1:30000 --decode http://127.0.0.1:30001 --host 0.0.0.0 --port 8000
+$ python -m sglang_router.launch_router --pd-disaggregation --prefill http://127.0.0.1:30000 --decode http://127.0.0.1:30001 --host 0.0.0.0 --port 8000
 ```
 
 ### DeepSeek Multi-Node

docs/advanced_features/router.md

@@ -278,7 +278,7 @@ The most sophisticated policy that combines cache optimization with load balanci
 
 3. **Cache Management**:
    - Maintains approximate radix trees per worker
-   - Periodically evicts LRU entries based on `--eviction-interval` and `--max-tree-size`
+   - Periodically evicts LRU entries based on `--eviction-interval-secs` and `--max-tree-size`
 
 ### Data Parallelism Aware Routing
 
@@ -296,7 +296,7 @@ This mode coordinates with SGLang's DP controller for optimized request distribu
 ### Core Settings
 
 | Parameter                   | Type | Default     | Description                                                     |
-|-----------------------------|------|-------------|-----------------------------------------------------------------|
+| --------------------------- | ---- | ----------- | --------------------------------------------------------------- |
 | `--host`                    | str  | 127.0.0.1   | Router server host address                                      |
 | `--port`                    | int  | 30000       | Router server port                                              |
 | `--worker-urls`             | list | []          | Worker URLs for separate launch mode                            |
@@ -308,17 +308,17 @@ This mode coordinates with SGLang's DP controller for optimized request distribu
 ### Cache-Aware Routing Parameters
 
 | Parameter                  | Type  | Default  | Description                                            |
-|---------------------------|-------|----------|--------------------------------------------------------|
+| -------------------------- | ----- | -------- | ------------------------------------------------------ |
 | `--cache-threshold`        | float | 0.5      | Minimum prefix match ratio for cache routing (0.0-1.0) |
 | `--balance-abs-threshold`  | int   | 32       | Absolute load difference threshold                     |
 | `--balance-rel-threshold`  | float | 1.0001   | Relative load ratio threshold                          |
-| `--eviction-interval`     | int   | 60       | Seconds between cache eviction cycles                  |
+| `--eviction-interval-secs` | int   | 60       | Seconds between cache eviction cycles                  |
 | `--max-tree-size`          | int   | 16777216 | Maximum nodes in routing tree                          |
 
 ### Fault Tolerance Parameters
 
 | Parameter                    | Type  | Default | Description                           |
-|------------------------------|-------|---------|---------------------------------------|
+| ---------------------------- | ----- | ------- | ------------------------------------- |
 | `--retry-max-retries`        | int   | 3       | Maximum retry attempts per request    |
 | `--retry-initial-backoff-ms` | int   | 100     | Initial retry backoff in milliseconds |
 | `--retry-max-backoff-ms`     | int   | 10000   | Maximum retry backoff in milliseconds |
@@ -334,7 +334,7 @@ This mode coordinates with SGLang's DP controller for optimized request distribu
 ### Prefill-Decode Disaggregation Parameters
 
 | Parameter                         | Type | Default | Description                                           |
-|-----------------------------------|------|---------|-------------------------------------------------------|
+| --------------------------------- | ---- | ------- | ----------------------------------------------------- |
 | `--pd-disaggregation`             | flag | False   | Enable PD disaggregated mode                          |
 | `--prefill`                       | list | []      | Prefill server URLs with optional bootstrap ports     |
 | `--decode`                        | list | []      | Decode server URLs                                    |
@@ -346,7 +346,7 @@ This mode coordinates with SGLang's DP controller for optimized request distribu
 ### Kubernetes Integration
 
 | Parameter                       | Type | Default                  | Description                                          |
-|---------------------------------|------|--------------------------|------------------------------------------------------|
+| ------------------------------- | ---- | ------------------------ | ---------------------------------------------------- |
 | `--service-discovery`           | flag | False                    | Enable Kubernetes service discovery                  |
 | `--selector`                    | list | []                       | Label selector for workers (key1=value1 key2=value2) |
 | `--prefill-selector`            | list | []                       | Label selector for prefill servers in PD mode        |
@@ -358,7 +358,7 @@ This mode coordinates with SGLang's DP controller for optimized request distribu
 ### Observability
 
 | Parameter              | Type | Default   | Description                                           |
-|------------------------|------|-----------|-------------------------------------------------------|
+| ---------------------- | ---- | --------- | ----------------------------------------------------- |
 | `--prometheus-port`    | int  | 29000     | Prometheus metrics port                               |
 | `--prometheus-host`    | str  | 127.0.0.1 | Prometheus metrics host                               |
 | `--log-dir`            | str  | None      | Directory for log files                               |
@@ -368,7 +368,7 @@ This mode coordinates with SGLang's DP controller for optimized request distribu
 ### CORS Configuration
 
 | Parameter                | Type | Default | Description          |
-|--------------------------|------|---------|----------------------|
+| ------------------------ | ---- | ------- | -------------------- |
 | `--cors-allowed-origins` | list | []      | Allowed CORS origins |
 
 ## Advanced Features
@@ -429,7 +429,7 @@ python -m sglang_router.launch_router \
 
 2. **High latency**: Check if cache-aware routing is causing imbalance. Try adjusting `--balance-abs-threshold` and `--balance-rel-threshold`.
 
-3. **Memory growth**: Reduce `--max-tree-size` or decrease `--eviction-interval` for more aggressive cache cleanup.
+3. **Memory growth**: Reduce `--max-tree-size` or decrease `--eviction-interval-secs` for more aggressive cache cleanup.
 
 4. **Circuit breaker triggering frequently**: Increase `--cb-failure-threshold` or extend `--cb-window-duration-secs`.
 

docs/references/multi_node_deployment/lws_pd/lws-examples/lb.yaml

@@ -27,7 +27,8 @@ spec:
           command:
           - python
           - -m
-          - sglang.srt.disaggregation.mini_lb
+          - sglang_router.launch_router
+          - --pd-disaggregation
           - --prefill
           - http://deepseekr10528-prefill-main:30000
           - --decode

docs/references/multi_node_deployment/lws_pd/lws_pd_deploy.md

@@ -714,7 +714,8 @@ spec:
           command:
           - python
           - -m
-          - sglang.srt.disaggregation.mini_lb
+          - sglang_router.launch_router
+          - --pd-disaggregation
           - --prefill
           - http://deepseekr10528-prefill-main:30000
           - --decode

python/sglang/srt/disaggregation/launch_lb.py

-import argparse
-import dataclasses
-
-from sglang.srt.disaggregation.mini_lb import PrefillConfig, run
-
-
-@dataclasses.dataclass
-class LBArgs:
-    host: str = "0.0.0.0"
-    port: int = 8000
-    policy: str = "random"
-    prefill_infos: list = dataclasses.field(default_factory=list)
-    decode_infos: list = dataclasses.field(default_factory=list)
-    log_interval: int = 5
-    timeout: int = 600
-
-    @staticmethod
-    def add_cli_args(parser: argparse.ArgumentParser):
-        parser.add_argument(
-            "--host",
-            type=str,
-            default=LBArgs.host,
-            help=f"Host to bind the server (default: {LBArgs.host})",
-        )
-        parser.add_argument(
-            "--port",
-            type=int,
-            default=LBArgs.port,
-            help=f"Port to bind the server (default: {LBArgs.port})",
-        )
-        parser.add_argument(
-            "--policy",
-            type=str,
-            default=LBArgs.policy,
-            choices=["random", "po2"],
-            help=f"Policy to use for load balancing (default: {LBArgs.policy})",
-        )
-        parser.add_argument(
-            "--prefill",
-            type=str,
-            default=[],
-            nargs="+",
-            help="URLs for prefill servers",
-        )
-        parser.add_argument(
-            "--decode",
-            type=str,
-            default=[],
-            nargs="+",
-            help="URLs for decode servers",
-        )
-        parser.add_argument(
-            "--prefill-bootstrap-ports",
-            type=int,
-            nargs="+",
-            help="Bootstrap ports for prefill servers",
-        )
-        parser.add_argument(
-            "--log-interval",
-            type=int,
-            default=LBArgs.log_interval,
-            help=f"Log interval in seconds (default: {LBArgs.log_interval})",
-        )
-        parser.add_argument(
-            "--timeout",
-            type=int,
-            default=LBArgs.timeout,
-            help=f"Timeout in seconds (default: {LBArgs.timeout})",
-        )
-
-    @classmethod
-    def from_cli_args(cls, args: argparse.Namespace) -> "LBArgs":
-        bootstrap_ports = args.prefill_bootstrap_ports
-        if bootstrap_ports is None:
-            bootstrap_ports = [None] * len(args.prefill)
-        elif len(bootstrap_ports) == 1:
-            bootstrap_ports = bootstrap_ports * len(args.prefill)
-        else:
-            if len(bootstrap_ports) != len(args.prefill):
-                raise ValueError(
-                    "Number of prefill URLs must match number of bootstrap ports"
-                )
-
-        prefill_infos = [
-            (url, port) for url, port in zip(args.prefill, bootstrap_ports)
-        ]
-
-        return cls(
-            host=args.host,
-            port=args.port,
-            policy=args.policy,
-            prefill_infos=prefill_infos,
-            decode_infos=args.decode,
-            log_interval=args.log_interval,
-            timeout=args.timeout,
-        )
-
-
-def main():
-    parser = argparse.ArgumentParser(
-        description="PD Disaggregation Load Balancer Server"
-    )
-    LBArgs.add_cli_args(parser)
-    args = parser.parse_args()
-    lb_args = LBArgs.from_cli_args(args)
-
-    prefill_configs = [PrefillConfig(url, port) for url, port in lb_args.prefill_infos]
-    run(
-        prefill_configs,
-        lb_args.decode_infos,
-        lb_args.host,
-        lb_args.port,
-        lb_args.timeout,
-    )
-
-
-if __name__ == "__main__":
-    main()

python/sglang/srt/disaggregation/mini_lb.py

-"""
-Minimal HTTP load balancer for prefill and decode servers for testing.
-"""
-
-import asyncio
-import dataclasses
-import logging
-import random
-import urllib
-from http import HTTPStatus
-from itertools import chain
-from typing import List, Optional
-
-import aiohttp
-import orjson
-import uvicorn
-from fastapi import FastAPI, HTTPException
-from fastapi.responses import ORJSONResponse, Response, StreamingResponse
-
-from sglang.srt.disaggregation.utils import PDRegistryRequest
-from sglang.srt.utils import maybe_wrap_ipv6_address
-
-AIOHTTP_STREAM_READ_CHUNK_SIZE = (
-    1024 * 64
-)  # 64KB, to prevent aiohttp's "Chunk too big" error
-
-
-def setup_logger():
-    logger = logging.getLogger("pdlb")
-    logger.setLevel(logging.INFO)
-
-    formatter = logging.Formatter(
-        "[PDLB (Python)] %(asctime)s - %(levelname)s - %(message)s",
-        datefmt="%Y-%m-%d %H:%M:%S",
-    )
-
-    handler = logging.StreamHandler()
-    handler.setFormatter(formatter)
-    logger.addHandler(handler)
-
-    return logger
-
-
-logger = setup_logger()
-
-
-@dataclasses.dataclass
-class PrefillConfig:
-    url: str
-    bootstrap_port: Optional[int] = None
-
-
-class MiniLoadBalancer:
-    def __init__(
-        self,
-        prefill_configs: List[PrefillConfig],
-        decode_servers: List[str],
-        timeout: int,
-    ):
-        self.prefill_configs = prefill_configs
-        self.prefill_servers = [p.url for p in prefill_configs]
-        self.decode_servers = decode_servers
-        self.timeout = timeout
-
-    def add_prefill_server(self, new_prefill_config: PrefillConfig):
-        self.prefill_configs.append(new_prefill_config)
-        self.prefill_servers.append(new_prefill_config.url)
-
-    def add_decode_server(self, new_decode_server: str):
-        self.decode_servers.append(new_decode_server)
-
-    def select_pair(self):
-        # TODO: return some message instead of panic
-        assert len(self.prefill_configs) > 0, "No prefill servers available"
-        assert len(self.decode_servers) > 0, "No decode servers available"
-
-        prefill_config = random.choice(self.prefill_configs)
-        decode_server = random.choice(self.decode_servers)
-        return prefill_config.url, prefill_config.bootstrap_port, decode_server
-
-    async def generate(
-        self, modified_request, prefill_server, decode_server, endpoint
-    ) -> ORJSONResponse:
-        assert endpoint[0] != "/", f"Endpoint should not start with '/': {endpoint}"
-
-        async with aiohttp.ClientSession(
-            timeout=aiohttp.ClientTimeout(
-                total=self.timeout
-            )  # Add timeout for request reliability
-        ) as session:
-            tasks = [
-                session.post(f"{prefill_server}/{endpoint}", json=modified_request),
-                session.post(f"{decode_server}/{endpoint}", json=modified_request),
-            ]
-
-            # Wait for both responses to complete. Prefill should end first.
-            prefill_response, decode_response = await asyncio.gather(*tasks)
-
-            if "return_logprob" in modified_request:
-
-                prefill_json = await prefill_response.json()
-                ret_json = await decode_response.json()
-
-                # merge `meta_info.input_token_logprobs` from prefill to decode
-                if "meta_info" in ret_json:
-                    if "input_token_logprobs" in ret_json["meta_info"]:
-                        ret_json["meta_info"]["input_token_logprobs"] = (
-                            prefill_json["meta_info"]["input_token_logprobs"]
-                            + ret_json["meta_info"]["input_token_logprobs"]
-                        )
-            else:
-                ret_json = await decode_response.json()
-
-            return ORJSONResponse(
-                content=ret_json,
-                status_code=decode_response.status,
-            )
-
-    async def generate_stream(
-        self, modified_request, prefill_server, decode_server, endpoint="generate"
-    ):
-        assert endpoint[0] != "/", f"Endpoint should not start with '/': {endpoint}"
-
-        async def stream_results():
-            async with aiohttp.ClientSession(
-                timeout=aiohttp.ClientTimeout(
-                    total=self.timeout
-                )  # Add timeout for request reliability
-            ) as session:
-                # Create the tasks for both prefill and decode requests
-                tasks = [
-                    session.post(f"{prefill_server}/{endpoint}", json=modified_request),
-                    session.post(f"{decode_server}/{endpoint}", json=modified_request),
-                ]
-                # Wait for both responses to complete. Since this is streaming, they return immediately.
-                prefill_response, decode_response = await asyncio.gather(*tasks)
-
-                if modified_request.get("return_logprob", False):
-                    prefill_chunks = []
-                    async for chunk in prefill_response.content:
-                        prefill_chunks.append(chunk)
-
-                    first_prefill_chunk = (
-                        prefill_chunks[0].decode("utf-8")[5:].strip("\n")
-                    )
-                    first_prefill_chunk_json = orjson.loads(first_prefill_chunk)
-
-                    async for chunk in decode_response.content:
-                        # Note: This is inefficient
-                        # merge prefill input_token_logprobs, output_token_logprobs to decode
-                        decoded_chunk = chunk.decode("utf-8")
-                        if (
-                            decoded_chunk
-                            and decoded_chunk.startswith("data:")
-                            and "[DONE]" not in decoded_chunk
-                        ):
-                            ret_json = orjson.loads(decoded_chunk[5:].strip("\n"))
-                            ret_json["meta_info"]["input_token_logprobs"] = (
-                                first_prefill_chunk_json["meta_info"][
-                                    "input_token_logprobs"
-                                ]
-                                + ret_json["meta_info"]["input_token_logprobs"]
-                            )
-
-                            yield b"data: " + orjson.dumps(ret_json) + b"\n\n"
-                        else:
-                            yield chunk
-                else:
-                    async for chunk in decode_response.content.iter_chunked(
-                        AIOHTTP_STREAM_READ_CHUNK_SIZE
-                    ):
-                        yield chunk
-
-        return StreamingResponse(
-            stream_results(),
-            media_type="text/event-stream",
-        )
-
-
-app = FastAPI()
-load_balancer: Optional[MiniLoadBalancer] = None
-
-
-@app.get("/health")
-async def health_check():
-    return Response(status_code=200)
-
-
-@app.get("/health_generate")
-async def health_generate():
-    prefill_servers, decode_servers = (
-        load_balancer.prefill_servers,
-        load_balancer.decode_servers,
-    )
-    async with aiohttp.ClientSession() as session:
-        # Create the tasks
-        tasks = []
-        for server in chain(prefill_servers, decode_servers):
-            tasks.append(session.get(f"{server}/health_generate"))
-        for i, response in enumerate(asyncio.as_completed(tasks)):
-            await response
-    return Response(status_code=200)
-
-
-@app.post("/flush_cache")
-async def flush_cache():
-    prefill_servers, decode_servers = (
-        load_balancer.prefill_servers,
-        load_balancer.decode_servers,
-    )
-    async with aiohttp.ClientSession() as session:
-        # Create the tasks
-        tasks = []
-        for server in chain(prefill_servers, decode_servers):
-            tasks.append(session.post(f"{server}/flush_cache"))
-        for i, response in enumerate(asyncio.as_completed(tasks)):
-            await response
-    return Response(status_code=200)
-
-
-@app.get("/get_server_info")
-async def get_server_info():
-    prefill_servers, decode_servers = (
-        load_balancer.prefill_servers,
-        load_balancer.decode_servers,
-    )
-    prefill_infos = []
-    decode_infos = []
-    all_internal_states = []
-
-    async with aiohttp.ClientSession() as session:
-        for server in chain(prefill_servers):
-            server_info = await session.get(f"{server}/get_server_info")
-            prefill_infos.append(await server_info.json())
-        for server in chain(decode_servers):
-            server_info = await session.get(f"{server}/get_server_info")
-            info_json = await server_info.json()
-            decode_infos.append(info_json)
-            # Extract internal_states from decode servers
-            if "internal_states" in info_json:
-                all_internal_states.extend(info_json["internal_states"])
-
-    # Return format expected by bench_one_batch_server.py
-    if all_internal_states:
-        return {
-            "internal_states": all_internal_states,
-            "prefill": prefill_infos,
-            "decode": decode_infos,
-        }
-    else:
-        # Fallback with dummy data if no internal states found
-        return {
-            "internal_states": [
-                {
-                    "last_gen_throughput": 0.0,
-                    "avg_spec_accept_length": None,
-                }
-            ],
-            "prefill": prefill_infos,
-            "decode": decode_infos,
-        }
-
-
-@app.get("/get_model_info")
-async def get_model_info():
-    global load_balancer
-
-    if not load_balancer or not load_balancer.prefill_servers:
-        raise HTTPException(
-            status_code=HTTPStatus.SERVICE_UNAVAILABLE,
-            detail="There is no server registered",
-        )
-
-    target_server_url = load_balancer.prefill_servers[0]
-    endpoint_url = f"{target_server_url}/get_model_info"
-
-    async with aiohttp.ClientSession() as session:
-        try:
-            async with session.get(endpoint_url) as response:
-                if response.status != 200:
-                    error_text = await response.text()
-                    raise HTTPException(
-                        status_code=HTTPStatus.BAD_GATEWAY,
-                        detail=(
-                            f"Failed to get model info from {target_server_url}"
-                            f"Status: {response.status}, Response: {error_text}"
-                        ),
-                    )
-
-                model_info_json = await response.json()
-                return ORJSONResponse(content=model_info_json)
-
-        except aiohttp.ClientError as e:
-            raise HTTPException(
-                status_code=HTTPStatus.SERVICE_UNAVAILABLE,
-                detail=f"Failed to get model info from backend",
-            )
-
-
-@app.post("/generate")
-async def handle_generate_request(request_data: dict):
-    prefill_server, bootstrap_port, decode_server = load_balancer.select_pair()
-
-    # Parse and transform prefill_server for bootstrap data
-    parsed_url = urllib.parse.urlparse(prefill_server)
-    hostname = maybe_wrap_ipv6_address(parsed_url.hostname)
-    modified_request = request_data.copy()
-
-    batch_size = _get_request_batch_size(modified_request)
-    if batch_size is not None:
-        modified_request.update(
-            {
-                "bootstrap_host": [hostname] * batch_size,
-                "bootstrap_port": [bootstrap_port] * batch_size,
-                "bootstrap_room": [
-                    _generate_bootstrap_room() for _ in range(batch_size)
-                ],
-            }
-        )
-    else:
-        modified_request.update(
-            {
-                "bootstrap_host": hostname,
-                "bootstrap_port": bootstrap_port,
-                "bootstrap_room": _generate_bootstrap_room(),
-            }
-        )
-
-    if request_data.get("stream", False):
-        return await load_balancer.generate_stream(
-            modified_request, prefill_server, decode_server, "generate"
-        )
-    else:
-        return await load_balancer.generate(
-            modified_request, prefill_server, decode_server, "generate"
-        )
-
-
-async def _forward_to_backend(request_data: dict, endpoint_name: str):
-    prefill_server, bootstrap_port, decode_server = load_balancer.select_pair()
-
-    # Parse and transform prefill_server for bootstrap data
-    parsed_url = urllib.parse.urlparse(prefill_server)
-    hostname = maybe_wrap_ipv6_address(parsed_url.hostname)
-    modified_request = request_data.copy()
-    modified_request.update(
-        {
-            "bootstrap_host": hostname,
-            "bootstrap_port": bootstrap_port,
-            "bootstrap_room": _generate_bootstrap_room(),
-        }
-    )
-
-    if request_data.get("stream", False):
-        return await load_balancer.generate_stream(
-            modified_request,
-            prefill_server,
-            decode_server,
-            endpoint=endpoint_name,
-        )
-    else:
-        return await load_balancer.generate(
-            modified_request,
-            prefill_server,
-            decode_server,
-            endpoint=endpoint_name,
-        )
-
-
-@app.post("/v1/chat/completions")
-async def handle_chat_completion_request(request_data: dict):
-    return await _forward_to_backend(request_data, "v1/chat/completions")
-
-
-@app.post("/v1/completions")
-async def handle_completion_request(request_data: dict):
-    return await _forward_to_backend(request_data, "v1/completions")
-
-
-def _generate_bootstrap_room():
-    return random.randint(0, 2**63 - 1)
-
-
-# We may utilize `GenerateReqInput`'s logic later
-def _get_request_batch_size(request):
-    if (text := request.get("text")) is not None:
-        return None if isinstance(text, str) else len(text)
-    if (input_ids := request.get("input_ids")) is not None:
-        return None if isinstance(input_ids[0], int) else len(input_ids)
-    return None
-
-
-@app.get("/v1/models")
-async def get_models():
-    prefill_server = load_balancer.prefill_servers[0]  # Get the first prefill server
-    async with aiohttp.ClientSession() as session:
-        try:
-            response = await session.get(f"{prefill_server}/v1/models")
-            if response.status != 200:
-                raise HTTPException(
-                    status_code=response.status,
-                    detail=f"Prefill server error: Status {response.status}",
-                )
-            return ORJSONResponse(content=await response.json())
-        except Exception as e:
-            raise HTTPException(status_code=500, detail=str(e))
-
-
-@app.post("/register")
-async def register(obj: PDRegistryRequest):
-    if obj.mode == "prefill":
-        load_balancer.add_prefill_server(
-            PrefillConfig(obj.registry_url, obj.bootstrap_port)
-        )
-        logger.info(
-            f"Registered prefill server: {obj.registry_url} with bootstrap port: {obj.bootstrap_port}"
-        )
-    elif obj.mode == "decode":
-        load_balancer.add_decode_server(obj.registry_url)
-        logger.info(f"Registered decode server: {obj.registry_url}")
-    else:
-        raise HTTPException(
-            status_code=400,
-            detail="Invalid mode. Must be either PREFILL or DECODE.",
-        )
-
-    logger.info(
-        f"#Prefill servers: {len(load_balancer.prefill_configs)}, "
-        f"#Decode servers: {len(load_balancer.decode_servers)}"
-    )
-
-    return Response(status_code=200)
-
-
-def run(prefill_configs, decode_addrs, host, port, timeout):
-    global load_balancer
-    load_balancer = MiniLoadBalancer(prefill_configs, decode_addrs, timeout=timeout)
-    uvicorn.run(app, host=host, port=port)
-
-
-if __name__ == "__main__":
-    # FIXME: remove this, use the unified entry point: sglang.srt.disaggregation.launch_lb
-    from sglang.srt.disaggregation.launch_lb import main
-
-    main()
+raise RuntimeError(
+    """The 'mini_lb' module has been relocated to the 'sglang_router' package.
+    We recommend installing 'sglang-router' with Rust support for optimal performance.
+    If you encounter issues building the router with Rust, set the environment variable
+    'SGLANG_ROUTER_BUILD_NO_RUST=1' and add '--mini-lb' to the command line to use the Python version of 'mini_lb'."""
+)

python/sglang/srt/disaggregation/utils.py

 from __future__ import annotations
 
-import dataclasses
 import os
 import random
-import threading
-import warnings
 from collections import deque
 from contextlib import nullcontext
 from enum import Enum
-from typing import TYPE_CHECKING, List, Optional
+from typing import TYPE_CHECKING, Optional
 
 import numpy as np
-import requests
 import torch
 import torch.distributed as dist
 
-from sglang.srt.utils import get_ip, is_npu
+from sglang.srt.utils import is_npu
 
 if TYPE_CHECKING:
     from sglang.srt.managers.schedule_batch import Req
@@ -305,49 +301,6 @@ def kv_to_page_num(num_kv_indices: int, page_size: int):
     return (num_kv_indices + page_size - 1) // page_size
 
 
-#########################
-# PDLB Registry
-#########################
-
-
-@dataclasses.dataclass
-class PDRegistryRequest:
-    """A request to register a machine itself to the LB."""
-
-    mode: str
-    registry_url: str
-    bootstrap_port: Optional[int] = None
-
-    def __post_init__(self):
-        if self.mode == "prefill" and self.bootstrap_port is None:
-            raise ValueError("Bootstrap port must be set in PREFILL mode.")
-        elif self.mode == "decode" and self.bootstrap_port is not None:
-            raise ValueError("Bootstrap port must not be set in DECODE mode.")
-        elif self.mode not in ["prefill", "decode"]:
-            raise ValueError(
-                f"Invalid mode: {self.mode}. Must be 'prefill' or 'decode'."
-            )
-
-
-def register_disaggregation_server(
-    mode: str, server_port: int, bootstrap_port: int, pdlb_url: str
-):
-    boostrap_port = bootstrap_port if mode == "prefill" else None
-    registry_request = PDRegistryRequest(
-        mode=mode,
-        registry_url=f"http://{get_ip()}:{server_port}",
-        bootstrap_port=boostrap_port,
-    )
-    res = requests.post(
-        f"{pdlb_url}/register",
-        json=dataclasses.asdict(registry_request),
-    )
-    if res.status_code != 200:
-        warnings.warn(
-            f"Failed to register disaggregation server: {res.status_code} {res.text}"
-        )
-
-
 #########################
 # Misc
 #########################

python/sglang/srt/entrypoints/http_server.py

@@ -47,11 +47,7 @@ from fastapi.exceptions import RequestValidationError
 from fastapi.middleware.cors import CORSMiddleware
 from fastapi.responses import ORJSONResponse, Response, StreamingResponse
 
-from sglang.srt.disaggregation.utils import (
-    FAKE_BOOTSTRAP_HOST,
-    DisaggregationMode,
-    register_disaggregation_server,
-)
+from sglang.srt.disaggregation.utils import FAKE_BOOTSTRAP_HOST, DisaggregationMode
 from sglang.srt.entrypoints.engine import _launch_subprocesses
 from sglang.srt.entrypoints.openai.protocol import (
     ChatCompletionRequest,
@@ -1405,13 +1401,5 @@ def _wait_and_warmup(
     if server_args.debug_tensor_dump_input_file:
         kill_process_tree(os.getpid())
 
-    if server_args.pdlb_url is not None:
-        register_disaggregation_server(
-            server_args.disaggregation_mode,
-            server_args.port,
-            server_args.disaggregation_bootstrap_port,
-            server_args.pdlb_url,
-        )
-
     if launch_callback is not None:
         launch_callback()

python/sglang/srt/server_args.py

@@ -367,7 +367,6 @@ class ServerArgs:
     disaggregation_prefill_pp: Optional[int] = 1
     disaggregation_ib_device: Optional[str] = None
     num_reserved_decode_tokens: int = 512  # used for decode kv cache offload in PD
-    pdlb_url: Optional[str] = None
 
     # For model weight update
     custom_weight_loader: Optional[List[str]] = None
@@ -2071,12 +2070,6 @@ class ServerArgs:
             default=ServerArgs.num_reserved_decode_tokens,
             help="Number of decode tokens that will have memory reserved when adding new request to the running batch.",
         )
-        parser.add_argument(
-            "--pdlb-url",
-            type=str,
-            default=None,
-            help="The URL of the PD disaggregation load balancer. If set, the prefill/decode server will register with the load balancer.",
-        )
 
         # Custom weight loader
         parser.add_argument(

python/sglang/test/test_utils.py

@@ -466,6 +466,25 @@ def try_cached_model(model_repo: str):
     return model_dir if model_dir else model_repo
 
 
+def popen_with_error_check(command: list[str], allow_exit: bool = False):
+    process = subprocess.Popen(command, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
+
+    def _run_and_check():
+        stdout, stderr = process.communicate()
+
+        while process.poll() is None:
+            time.sleep(5)
+
+        if not allow_exit or process.returncode != 0:
+            raise Exception(
+                f"{command} exited with code {process.returncode}\n{stdout=}\n{stderr=}"
+            )
+
+    t = threading.Thread(target=_run_and_check)
+    t.start()
+    return process
+
+
 def popen_launch_server(
     model: str,
     base_url: str,

scripts/ci/ci_install_dependency.sh

@@ -45,6 +45,10 @@ fi
 # Install the main package
 $PIP_CMD install -e "python[dev]" --extra-index-url https://download.pytorch.org/whl/${CU_VERSION} $PIP_INSTALL_SUFFIX
 
+# Install router for pd-disagg test
+SGLANG_ROUTER_BUILD_NO_RUST=1 $PIP_CMD install -e "sgl-router" $PIP_INSTALL_SUFFIX
+
+
 if [ "$IS_BLACKWELL" = "1" ]; then
     # TODO auto determine sgl-kernel version
     SGL_KERNEL_VERSION=0.3.8

sgl-router/py_src/sglang_router/__init__.py

-# a lightweihgt wrapper on router with argument type and comments
-# no wrapper on policy type => direct export
-from sglang_router.router import Router
 from sglang_router.version import __version__
-from sglang_router_rs import PolicyType
 
-__all__ = ["Router", "PolicyType", "__version__"]
+__all__ = ["__version__"]

sgl-router/py_src/sglang_router/mini_lb.py

+"""
+Minimal HTTP load balancer for prefill and decode servers for testing.
+"""
+
+import asyncio
+import ipaddress
+import logging
+import random
+import urllib
+from http import HTTPStatus
+from itertools import chain
+from typing import Optional
+
+import aiohttp
+import orjson
+import uvicorn
+from fastapi import FastAPI, HTTPException
+from fastapi.responses import ORJSONResponse, Response, StreamingResponse
+from sglang_router.router_args import RouterArgs
+
+logger = logging.getLogger(__name__)
+
+AIOHTTP_STREAM_READ_CHUNK_SIZE = (
+    1024 * 64
+)  # 64KB, to prevent aiohttp's "Chunk too big" error
+
+
+def maybe_wrap_ipv6_address(address: str) -> str:
+    try:
+        ipaddress.IPv6Address(address)
+        return f"[{address}]"
+    except ValueError:
+        return address
+
+
+class MiniLoadBalancer:
+    def __init__(
+        self,
+        router_args: RouterArgs,
+    ):
+        self._validate_router_args(router_args)
+
+        self.host = router_args.host
+        self.port = router_args.port
+        self.timeout = router_args.request_timeout_secs
+        self.prefill_urls = [url[0] for url in router_args.prefill_urls]
+        self.prefill_bootstrap_ports = [url[1] for url in router_args.prefill_urls]
+        self.decode_urls = router_args.decode_urls
+
+    def _validate_router_args(self, router_args: RouterArgs):
+        logger.warning(
+            "\x1b[33mMiniLB is only for debugging purposes, it only supports random policy!\033[0m"
+        )
+
+        # NOTE: too many arguments unsupported, just validate some important ones
+        if router_args.policy != "random":
+            logger.warning("[MiniLB] Overriding policy to random")
+            router_args.policy = "random"
+
+        if not router_args.pd_disaggregation:
+            raise ValueError("MiniLB only supports PD disaggregation mode")
+
+        if len(router_args.prefill_urls) == 0 or len(router_args.decode_urls) == 0:
+            raise ValueError(
+                "MiniLB requires at least one prefill and one decode server"
+            )
+
+    def start(self):
+        global lb
+        lb = self
+        uvicorn.run(app, host=self.host, port=self.port)
+
+    def select_pair(self):
+        assert len(self.prefill_urls) > 0, "No prefill servers available"
+        assert len(self.decode_urls) > 0, "No decode servers available"
+        pidx = random.randint(0, len(self.prefill_urls) - 1)
+        didx = random.randint(0, len(self.decode_urls) - 1)
+        return (
+            self.prefill_urls[pidx],
+            self.prefill_bootstrap_ports[pidx],
+            self.decode_urls[didx],
+        )
+
+    async def generate(
+        self, modified_request, prefill_server, decode_server, endpoint
+    ) -> ORJSONResponse:
+        assert endpoint[0] != "/", f"Endpoint should not start with '/': {endpoint}"
+
+        async with aiohttp.ClientSession(
+            timeout=aiohttp.ClientTimeout(
+                total=self.timeout
+            )  # Add timeout for request reliability
+        ) as session:
+            tasks = [
+                session.post(f"{prefill_server}/{endpoint}", json=modified_request),
+                session.post(f"{decode_server}/{endpoint}", json=modified_request),
+            ]
+
+            # Wait for both responses to complete. Prefill should end first.
+            prefill_response, decode_response = await asyncio.gather(*tasks)
+
+            if "return_logprob" in modified_request:
+
+                prefill_json = await prefill_response.json()
+                ret_json = await decode_response.json()
+
+                # merge `meta_info.input_token_logprobs` from prefill to decode
+                if "meta_info" in ret_json:
+                    if "input_token_logprobs" in ret_json["meta_info"]:
+                        ret_json["meta_info"]["input_token_logprobs"] = (
+                            prefill_json["meta_info"]["input_token_logprobs"]
+                            + ret_json["meta_info"]["input_token_logprobs"]
+                        )
+            else:
+                ret_json = await decode_response.json()
+
+            return ORJSONResponse(
+                content=ret_json,
+                status_code=decode_response.status,
+            )
+
+    async def generate_stream(
+        self, modified_request, prefill_server, decode_server, endpoint="generate"
+    ):
+        assert endpoint[0] != "/", f"Endpoint should not start with '/': {endpoint}"
+
+        async def stream_results():
+            async with aiohttp.ClientSession(
+                timeout=aiohttp.ClientTimeout(
+                    total=self.timeout
+                )  # Add timeout for request reliability
+            ) as session:
+                # Create the tasks for both prefill and decode requests
+                tasks = [
+                    session.post(f"{prefill_server}/{endpoint}", json=modified_request),
+                    session.post(f"{decode_server}/{endpoint}", json=modified_request),
+                ]
+                # Wait for both responses to complete. Since this is streaming, they return immediately.
+                prefill_response, decode_response = await asyncio.gather(*tasks)
+
+                if modified_request.get("return_logprob", False):
+                    prefill_chunks = []
+                    async for chunk in prefill_response.content:
+                        prefill_chunks.append(chunk)
+
+                    first_prefill_chunk = (
+                        prefill_chunks[0].decode("utf-8")[5:].strip("\n")
+                    )
+                    first_prefill_chunk_json = orjson.loads(first_prefill_chunk)
+
+                    async for chunk in decode_response.content:
+                        # Note: This is inefficient
+                        # merge prefill input_token_logprobs, output_token_logprobs to decode
+                        decoded_chunk = chunk.decode("utf-8")
+                        if (
+                            decoded_chunk
+                            and decoded_chunk.startswith("data:")
+                            and "[DONE]" not in decoded_chunk
+                        ):
+                            ret_json = orjson.loads(decoded_chunk[5:].strip("\n"))
+                            ret_json["meta_info"]["input_token_logprobs"] = (
+                                first_prefill_chunk_json["meta_info"][
+                                    "input_token_logprobs"
+                                ]
+                                + ret_json["meta_info"]["input_token_logprobs"]
+                            )
+
+                            yield b"data: " + orjson.dumps(ret_json) + b"\n\n"
+                        else:
+                            yield chunk
+                else:
+                    async for chunk in decode_response.content.iter_chunked(
+                        AIOHTTP_STREAM_READ_CHUNK_SIZE
+                    ):
+                        yield chunk
+
+        return StreamingResponse(
+            stream_results(),
+            media_type="text/event-stream",
+        )
+
+
+app = FastAPI()
+lb: Optional[MiniLoadBalancer] = None
+
+
+@app.get("/health")
+async def health_check():
+    return Response(status_code=200)
+
+
+@app.get("/health_generate")
+async def health_generate():
+    async with aiohttp.ClientSession() as session:
+        # Create the tasks
+        tasks = []
+        for server in chain(lb.prefill_urls, lb.decode_urls):
+            tasks.append(session.get(f"{server}/health_generate"))
+        for i, response in enumerate(asyncio.as_completed(tasks)):
+            await response
+    return Response(status_code=200)
+
+
+@app.post("/flush_cache")
+async def flush_cache():
+    async with aiohttp.ClientSession() as session:
+        # Create the tasks
+        tasks = []
+        for server in chain(lb.prefill_urls, lb.decode_urls):
+            tasks.append(session.post(f"{server}/flush_cache"))
+        for i, response in enumerate(asyncio.as_completed(tasks)):
+            await response
+    return Response(status_code=200)
+
+
+@app.get("/get_server_info")
+async def get_server_info():
+    prefill_infos = []
+    decode_infos = []
+    all_internal_states = []
+
+    async with aiohttp.ClientSession() as session:
+        for server in lb.prefill_urls:
+            server_info = await session.get(f"{server}/get_server_info")
+            prefill_infos.append(await server_info.json())
+        for server in lb.decode_urls:
+            server_info = await session.get(f"{server}/get_server_info")
+            info_json = await server_info.json()
+            decode_infos.append(info_json)
+            # Extract internal_states from decode servers
+            if "internal_states" in info_json:
+                all_internal_states.extend(info_json["internal_states"])
+
+    # Return format expected by bench_one_batch_server.py
+    if all_internal_states:
+        return {
+            "internal_states": all_internal_states,
+            "prefill": prefill_infos,
+            "decode": decode_infos,
+        }
+    else:
+        # Fallback with dummy data if no internal states found
+        return {
+            "internal_states": [
+                {
+                    "last_gen_throughput": 0.0,
+                    "avg_spec_accept_length": None,
+                }
+            ],
+            "prefill": prefill_infos,
+            "decode": decode_infos,
+        }
+
+
+@app.get("/get_model_info")
+async def get_model_info():
+    if not lb or not lb.prefill_urls:
+        raise HTTPException(
+            status_code=HTTPStatus.SERVICE_UNAVAILABLE,
+            detail="There is no server registered",
+        )
+
+    target_server_url = lb.prefill_urls[0]
+    endpoint_url = f"{target_server_url}/get_model_info"
+
+    async with aiohttp.ClientSession() as session:
+        try:
+            async with session.get(endpoint_url) as response:
+                if response.status != 200:
+                    error_text = await response.text()
+                    raise HTTPException(
+                        status_code=HTTPStatus.BAD_GATEWAY,
+                        detail=(
+                            f"Failed to get model info from {target_server_url}"
+                            f"Status: {response.status}, Response: {error_text}"
+                        ),
+                    )
+
+                model_info_json = await response.json()
+                return ORJSONResponse(content=model_info_json)
+
+        except aiohttp.ClientError as e:
+            raise HTTPException(
+                status_code=HTTPStatus.SERVICE_UNAVAILABLE,
+                detail=f"Failed to get model info from backend",
+            )
+
+
+@app.post("/generate")
+async def handle_generate_request(request_data: dict):
+    prefill_server, bootstrap_port, decode_server = lb.select_pair()
+
+    # Parse and transform prefill_server for bootstrap data
+    parsed_url = urllib.parse.urlparse(prefill_server)
+    hostname = maybe_wrap_ipv6_address(parsed_url.hostname)
+    modified_request = request_data.copy()
+
+    batch_size = _get_request_batch_size(modified_request)
+    if batch_size is not None:
+        modified_request.update(
+            {
+                "bootstrap_host": [hostname] * batch_size,
+                "bootstrap_port": [bootstrap_port] * batch_size,
+                "bootstrap_room": [
+                    _generate_bootstrap_room() for _ in range(batch_size)
+                ],
+            }
+        )
+    else:
+        modified_request.update(
+            {
+                "bootstrap_host": hostname,
+                "bootstrap_port": bootstrap_port,
+                "bootstrap_room": _generate_bootstrap_room(),
+            }
+        )
+
+    if request_data.get("stream", False):
+        return await lb.generate_stream(
+            modified_request, prefill_server, decode_server, "generate"
+        )
+    else:
+        return await lb.generate(
+            modified_request, prefill_server, decode_server, "generate"
+        )
+
+
+async def _forward_to_backend(request_data: dict, endpoint_name: str):
+    prefill_server, bootstrap_port, decode_server = lb.select_pair()
+
+    # Parse and transform prefill_server for bootstrap data
+    parsed_url = urllib.parse.urlparse(prefill_server)
+    hostname = maybe_wrap_ipv6_address(parsed_url.hostname)
+    modified_request = request_data.copy()
+    modified_request.update(
+        {
+            "bootstrap_host": hostname,
+            "bootstrap_port": bootstrap_port,
+            "bootstrap_room": _generate_bootstrap_room(),
+        }
+    )
+
+    if request_data.get("stream", False):
+        return await lb.generate_stream(
+            modified_request,
+            prefill_server,
+            decode_server,
+            endpoint=endpoint_name,
+        )
+    else:
+        return await lb.generate(
+            modified_request,
+            prefill_server,
+            decode_server,
+            endpoint=endpoint_name,
+        )
+
+
+@app.post("/v1/chat/completions")
+async def handle_chat_completion_request(request_data: dict):
+    return await _forward_to_backend(request_data, "v1/chat/completions")
+
+
+@app.post("/v1/completions")
+async def handle_completion_request(request_data: dict):
+    return await _forward_to_backend(request_data, "v1/completions")
+
+
+def _generate_bootstrap_room():
+    return random.randint(0, 2**63 - 1)
+
+
+# We may utilize `GenerateReqInput`'s logic later
+def _get_request_batch_size(request):
+    if (text := request.get("text")) is not None:
+        return None if isinstance(text, str) else len(text)
+    if (input_ids := request.get("input_ids")) is not None:
+        return None if isinstance(input_ids[0], int) else len(input_ids)
+    return None
+
+
+@app.get("/v1/models")
+async def get_models():
+    prefill_server = lb.prefill_urls[0]  # Get the first prefill server
+    async with aiohttp.ClientSession() as session:
+        try:
+            response = await session.get(f"{prefill_server}/v1/models")
+            if response.status != 200:
+                raise HTTPException(
+                    status_code=response.status,
+                    detail=f"Prefill server error: Status {response.status}",
+                )
+            return ORJSONResponse(content=await response.json())
+        except Exception as e:
+            raise HTTPException(status_code=500, detail=str(e))

sgl-router/py_src/sglang_router/router.py

-from typing import Dict, List, Optional
+from typing import Optional
 
+from sglang_router.router_args import RouterArgs
 from sglang_router_rs import PolicyType
 from sglang_router_rs import Router as _Router
 
 
+def policy_from_str(policy_str: Optional[str]) -> PolicyType:
+    """Convert policy string to PolicyType enum."""
+    if policy_str is None:
+        return None
+    policy_map = {
+        "random": PolicyType.Random,
+        "round_robin": PolicyType.RoundRobin,
+        "cache_aware": PolicyType.CacheAware,
+        "power_of_two": PolicyType.PowerOfTwo,
+    }
+    return policy_map[policy_str]
+
+
 class Router:
     """
     A high-performance router for distributing requests across worker nodes.
@@ -78,130 +92,34 @@ class Router:
         tokenizer_path: Explicit tokenizer path (overrides model_path tokenizer if provided). Default: None
     """
 
-    def __init__(
-        self,
-        worker_urls: List[str],
-        policy: PolicyType = PolicyType.RoundRobin,
-        host: str = "127.0.0.1",
-        port: int = 3001,
-        worker_startup_timeout_secs: int = 600,
-        worker_startup_check_interval: int = 30,
-        cache_threshold: float = 0.3,
-        balance_abs_threshold: int = 64,
-        balance_rel_threshold: float = 1.5,
-        eviction_interval_secs: int = 120,
-        max_tree_size: int = 2**26,
-        max_payload_size: int = 512 * 1024 * 1024,  # 512MB
-        dp_aware: bool = False,
-        api_key: Optional[str] = None,
-        log_dir: Optional[str] = None,
-        log_level: Optional[str] = None,
-        service_discovery: bool = False,
-        selector: Dict[str, str] = None,
-        service_discovery_port: int = 80,
-        service_discovery_namespace: Optional[str] = None,
-        prefill_selector: Dict[str, str] = None,
-        decode_selector: Dict[str, str] = None,
-        bootstrap_port_annotation: str = "sglang.ai/bootstrap-port",
-        prometheus_port: Optional[int] = None,
-        prometheus_host: Optional[str] = None,
-        request_timeout_secs: int = 1800,
-        request_id_headers: Optional[List[str]] = None,
-        pd_disaggregation: bool = False,
-        prefill_urls: Optional[List[tuple]] = None,
-        decode_urls: Optional[List[str]] = None,
-        prefill_policy: Optional[PolicyType] = None,
-        decode_policy: Optional[PolicyType] = None,
-        max_concurrent_requests: int = 256,
-        queue_size: int = 100,
-        queue_timeout_secs: int = 60,
-        rate_limit_tokens_per_second: Optional[int] = None,
-        cors_allowed_origins: List[str] = None,
-        retry_max_retries: int = 5,
-        retry_initial_backoff_ms: int = 50,
-        retry_max_backoff_ms: int = 30_000,
-        retry_backoff_multiplier: float = 1.5,
-        retry_jitter_factor: float = 0.2,
-        cb_failure_threshold: int = 10,
-        cb_success_threshold: int = 3,
-        cb_timeout_duration_secs: int = 60,
-        cb_window_duration_secs: int = 120,
-        disable_retries: bool = False,
-        disable_circuit_breaker: bool = False,
-        health_failure_threshold: int = 3,
-        health_success_threshold: int = 2,
-        health_check_timeout_secs: int = 5,
-        health_check_interval_secs: int = 60,
-        health_check_endpoint: str = "/health",
-        model_path: Optional[str] = None,
-        tokenizer_path: Optional[str] = None,
-    ):
-        if selector is None:
-            selector = {}
-        if prefill_selector is None:
-            prefill_selector = {}
-        if decode_selector is None:
-            decode_selector = {}
-        if cors_allowed_origins is None:
-            cors_allowed_origins = []
+    def __init__(self, router: _Router):
+        self._router = router
 
-        self._router = _Router(
-            worker_urls=worker_urls,
-            policy=policy,
-            host=host,
-            port=port,
-            worker_startup_timeout_secs=worker_startup_timeout_secs,
-            worker_startup_check_interval=worker_startup_check_interval,
-            cache_threshold=cache_threshold,
-            balance_abs_threshold=balance_abs_threshold,
-            balance_rel_threshold=balance_rel_threshold,
-            eviction_interval_secs=eviction_interval_secs,
-            max_tree_size=max_tree_size,
-            max_payload_size=max_payload_size,
-            dp_aware=dp_aware,
-            api_key=api_key,
-            log_dir=log_dir,
-            log_level=log_level,
-            service_discovery=service_discovery,
-            selector=selector,
-            service_discovery_port=service_discovery_port,
-            service_discovery_namespace=service_discovery_namespace,
-            prefill_selector=prefill_selector,
-            decode_selector=decode_selector,
-            bootstrap_port_annotation=bootstrap_port_annotation,
-            prometheus_port=prometheus_port,
-            prometheus_host=prometheus_host,
-            request_timeout_secs=request_timeout_secs,
-            request_id_headers=request_id_headers,
-            pd_disaggregation=pd_disaggregation,
-            prefill_urls=prefill_urls,
-            decode_urls=decode_urls,
-            prefill_policy=prefill_policy,
-            decode_policy=decode_policy,
-            max_concurrent_requests=max_concurrent_requests,
-            queue_size=queue_size,
-            queue_timeout_secs=queue_timeout_secs,
-            rate_limit_tokens_per_second=rate_limit_tokens_per_second,
-            cors_allowed_origins=cors_allowed_origins,
-            retry_max_retries=retry_max_retries,
-            retry_initial_backoff_ms=retry_initial_backoff_ms,
-            retry_max_backoff_ms=retry_max_backoff_ms,
-            retry_backoff_multiplier=retry_backoff_multiplier,
-            retry_jitter_factor=retry_jitter_factor,
-            cb_failure_threshold=cb_failure_threshold,
-            cb_success_threshold=cb_success_threshold,
-            cb_timeout_duration_secs=cb_timeout_duration_secs,
-            cb_window_duration_secs=cb_window_duration_secs,
-            disable_retries=disable_retries,
-            disable_circuit_breaker=disable_circuit_breaker,
-            health_failure_threshold=health_failure_threshold,
-            health_success_threshold=health_success_threshold,
-            health_check_timeout_secs=health_check_timeout_secs,
-            health_check_interval_secs=health_check_interval_secs,
-            health_check_endpoint=health_check_endpoint,
-            model_path=model_path,
-            tokenizer_path=tokenizer_path,
+    @staticmethod
+    def from_args(args: RouterArgs) -> "Router":
+        """Create a router from a RouterArgs instance."""
+
+        args_dict = vars(args)
+        # Convert RouterArgs to _Router parameters
+        args_dict["worker_urls"] = (
+            []
+            if args_dict["service_discovery"] or args_dict["pd_disaggregation"]
+            else args_dict["worker_urls"]
+        )
+        args_dict["policy"] = policy_from_str(args_dict["policy"])
+        args_dict["prefill_urls"] = (
+            args_dict["prefill_urls"] if args_dict["pd_disaggregation"] else None
         )
+        args_dict["decode_urls"] = (
+            args_dict["decode_urls"] if args_dict["pd_disaggregation"] else None
+        )
+        args_dict["prefill_policy"] = policy_from_str(args_dict["prefill_policy"])
+        args_dict["decode_policy"] = policy_from_str(args_dict["decode_policy"])
+
+        # remoge mini_lb parameter
+        args_dict.pop("mini_lb")
+
+        return Router(_Router(**args_dict))
 
     def start(self) -> None:
         """Start the router server.

sgl-router/py_test/test_launch_router.py

@@ -33,7 +33,7 @@ class TestLaunchRouter(unittest.TestCase):
             cache_threshold=0.5,
             balance_abs_threshold=32,
             balance_rel_threshold=1.0001,
-            eviction_interval=60,
+            eviction_interval_secs=60,
             max_tree_size=2**24,
             max_payload_size=256 * 1024 * 1024,  # 256MB
             verbose=False,
@@ -176,9 +176,8 @@ class TestLaunchRouter(unittest.TestCase):
         """Test basic PD router functionality without actually starting servers."""
         # This test just verifies the PD router can be created and configured
         # without actually starting it (which would require real prefill/decode servers)
-        from sglang_router import Router
         from sglang_router.launch_router import RouterArgs
-        from sglang_router_rs import PolicyType
+        from sglang_router.router import PolicyType, Router
 
         # Test RouterArgs parsing for PD mode
         # Simulate the parsed args structure from argparse with action="append"
@@ -209,18 +208,7 @@ class TestLaunchRouter(unittest.TestCase):
         self.assertEqual(router_args.decode_urls[1], "http://decode2:8081")
 
         # Test Router creation in PD mode
-        router = Router(
-            worker_urls=[],  # Empty for PD mode
-            pd_disaggregation=True,
-            prefill_urls=[
-                ("http://prefill1:8080", 9000),
-                ("http://prefill2:8080", None),
-            ],
-            decode_urls=["http://decode1:8081", "http://decode2:8081"],
-            policy=PolicyType.CacheAware,
-            host="127.0.0.1",
-            port=3001,
-        )
+        router = Router.from_args(router_args)
         self.assertIsNotNone(router)
 
     def test_policy_validation(self):

sgl-router/py_test/test_launch_server.py

@@ -77,7 +77,7 @@ def popen_launch_router(
         port,
         "--dp",
         str(dp_size),
-        "--router-eviction-interval",
+        "--router-eviction-interval-secs",
         "5",
         "--router-policy",
         policy,

sgl-router/pyproject.toml

@@ -28,8 +28,3 @@ find = { where = ["py_src"] }
 # workaround for https://github.com/pypa/twine/issues/1216
 [tool.setuptools]
 license-files = []
-
-[[tool.setuptools-rust.ext-modules]]
-target = "sglang_router_rs"
-path = "Cargo.toml"
-binding = "PyO3"