Simplify Router arguments passing and build it in docker image (#9964)
This commit is contained in:
Liangsheng Yin
395
sgl-router/py_src/sglang_router/mini_lb.py
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395
sgl-router/py_src/sglang_router/mini_lb.py
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"""
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Minimal HTTP load balancer for prefill and decode servers for testing.
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"""
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import asyncio
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import ipaddress
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import logging
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import random
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import urllib
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from http import HTTPStatus
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from itertools import chain
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from typing import Optional
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import aiohttp
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import orjson
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import uvicorn
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from fastapi import FastAPI, HTTPException
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from fastapi.responses import ORJSONResponse, Response, StreamingResponse
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from sglang_router.router_args import RouterArgs
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logger = logging.getLogger(__name__)
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AIOHTTP_STREAM_READ_CHUNK_SIZE = (
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1024 * 64
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) # 64KB, to prevent aiohttp's "Chunk too big" error
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def maybe_wrap_ipv6_address(address: str) -> str:
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try:
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ipaddress.IPv6Address(address)
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return f"[{address}]"
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except ValueError:
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return address
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class MiniLoadBalancer:
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def __init__(
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self,
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router_args: RouterArgs,
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):
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self._validate_router_args(router_args)
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self.host = router_args.host
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self.port = router_args.port
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self.timeout = router_args.request_timeout_secs
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self.prefill_urls = [url[0] for url in router_args.prefill_urls]
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self.prefill_bootstrap_ports = [url[1] for url in router_args.prefill_urls]
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self.decode_urls = router_args.decode_urls
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def _validate_router_args(self, router_args: RouterArgs):
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logger.warning(
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"\x1b[33mMiniLB is only for debugging purposes, it only supports random policy!\033[0m"
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)
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# NOTE: too many arguments unsupported, just validate some important ones
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if router_args.policy != "random":
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logger.warning("[MiniLB] Overriding policy to random")
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router_args.policy = "random"
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if not router_args.pd_disaggregation:
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raise ValueError("MiniLB only supports PD disaggregation mode")
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if len(router_args.prefill_urls) == 0 or len(router_args.decode_urls) == 0:
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raise ValueError(
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"MiniLB requires at least one prefill and one decode server"
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)
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def start(self):
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global lb
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lb = self
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uvicorn.run(app, host=self.host, port=self.port)
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def select_pair(self):
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assert len(self.prefill_urls) > 0, "No prefill servers available"
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assert len(self.decode_urls) > 0, "No decode servers available"
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pidx = random.randint(0, len(self.prefill_urls) - 1)
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didx = random.randint(0, len(self.decode_urls) - 1)
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return (
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self.prefill_urls[pidx],
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self.prefill_bootstrap_ports[pidx],
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self.decode_urls[didx],
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)
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async def generate(
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self, modified_request, prefill_server, decode_server, endpoint
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) -> ORJSONResponse:
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assert endpoint[0] != "/", f"Endpoint should not start with '/': {endpoint}"
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async with aiohttp.ClientSession(
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timeout=aiohttp.ClientTimeout(
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total=self.timeout
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) # Add timeout for request reliability
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) as session:
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tasks = [
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session.post(f"{prefill_server}/{endpoint}", json=modified_request),
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session.post(f"{decode_server}/{endpoint}", json=modified_request),
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]
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# Wait for both responses to complete. Prefill should end first.
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prefill_response, decode_response = await asyncio.gather(*tasks)
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if "return_logprob" in modified_request:
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prefill_json = await prefill_response.json()
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ret_json = await decode_response.json()
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# merge `meta_info.input_token_logprobs` from prefill to decode
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if "meta_info" in ret_json:
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if "input_token_logprobs" in ret_json["meta_info"]:
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ret_json["meta_info"]["input_token_logprobs"] = (
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prefill_json["meta_info"]["input_token_logprobs"]
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+ ret_json["meta_info"]["input_token_logprobs"]
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)
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else:
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ret_json = await decode_response.json()
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return ORJSONResponse(
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content=ret_json,
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status_code=decode_response.status,
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)
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async def generate_stream(
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self, modified_request, prefill_server, decode_server, endpoint="generate"
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):
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assert endpoint[0] != "/", f"Endpoint should not start with '/': {endpoint}"
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async def stream_results():
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async with aiohttp.ClientSession(
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timeout=aiohttp.ClientTimeout(
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total=self.timeout
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) # Add timeout for request reliability
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) as session:
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# Create the tasks for both prefill and decode requests
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tasks = [
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session.post(f"{prefill_server}/{endpoint}", json=modified_request),
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session.post(f"{decode_server}/{endpoint}", json=modified_request),
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]
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# Wait for both responses to complete. Since this is streaming, they return immediately.
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prefill_response, decode_response = await asyncio.gather(*tasks)
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if modified_request.get("return_logprob", False):
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prefill_chunks = []
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async for chunk in prefill_response.content:
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prefill_chunks.append(chunk)
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first_prefill_chunk = (
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prefill_chunks[0].decode("utf-8")[5:].strip("\n")
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)
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first_prefill_chunk_json = orjson.loads(first_prefill_chunk)
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async for chunk in decode_response.content:
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# Note: This is inefficient
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# merge prefill input_token_logprobs, output_token_logprobs to decode
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decoded_chunk = chunk.decode("utf-8")
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if (
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decoded_chunk
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and decoded_chunk.startswith("data:")
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and "[DONE]" not in decoded_chunk
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):
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ret_json = orjson.loads(decoded_chunk[5:].strip("\n"))
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ret_json["meta_info"]["input_token_logprobs"] = (
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first_prefill_chunk_json["meta_info"][
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"input_token_logprobs"
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]
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+ ret_json["meta_info"]["input_token_logprobs"]
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)
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yield b"data: " + orjson.dumps(ret_json) + b"\n\n"
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else:
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yield chunk
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else:
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async for chunk in decode_response.content.iter_chunked(
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AIOHTTP_STREAM_READ_CHUNK_SIZE
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):
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yield chunk
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return StreamingResponse(
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stream_results(),
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media_type="text/event-stream",
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)
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app = FastAPI()
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lb: Optional[MiniLoadBalancer] = None
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@app.get("/health")
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async def health_check():
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return Response(status_code=200)
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@app.get("/health_generate")
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async def health_generate():
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async with aiohttp.ClientSession() as session:
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# Create the tasks
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tasks = []
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for server in chain(lb.prefill_urls, lb.decode_urls):
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tasks.append(session.get(f"{server}/health_generate"))
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for i, response in enumerate(asyncio.as_completed(tasks)):
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await response
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return Response(status_code=200)
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@app.post("/flush_cache")
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async def flush_cache():
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async with aiohttp.ClientSession() as session:
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# Create the tasks
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tasks = []
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for server in chain(lb.prefill_urls, lb.decode_urls):
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tasks.append(session.post(f"{server}/flush_cache"))
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for i, response in enumerate(asyncio.as_completed(tasks)):
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await response
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return Response(status_code=200)
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@app.get("/get_server_info")
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async def get_server_info():
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prefill_infos = []
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decode_infos = []
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all_internal_states = []
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async with aiohttp.ClientSession() as session:
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for server in lb.prefill_urls:
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server_info = await session.get(f"{server}/get_server_info")
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prefill_infos.append(await server_info.json())
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for server in lb.decode_urls:
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server_info = await session.get(f"{server}/get_server_info")
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info_json = await server_info.json()
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decode_infos.append(info_json)
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# Extract internal_states from decode servers
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if "internal_states" in info_json:
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all_internal_states.extend(info_json["internal_states"])
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# Return format expected by bench_one_batch_server.py
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if all_internal_states:
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return {
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"internal_states": all_internal_states,
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"prefill": prefill_infos,
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"decode": decode_infos,
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}
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else:
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# Fallback with dummy data if no internal states found
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return {
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"internal_states": [
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{
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"last_gen_throughput": 0.0,
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"avg_spec_accept_length": None,
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}
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],
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"prefill": prefill_infos,
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"decode": decode_infos,
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}
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@app.get("/get_model_info")
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async def get_model_info():
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if not lb or not lb.prefill_urls:
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raise HTTPException(
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status_code=HTTPStatus.SERVICE_UNAVAILABLE,
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detail="There is no server registered",
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)
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target_server_url = lb.prefill_urls[0]
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endpoint_url = f"{target_server_url}/get_model_info"
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async with aiohttp.ClientSession() as session:
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try:
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async with session.get(endpoint_url) as response:
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if response.status != 200:
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error_text = await response.text()
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raise HTTPException(
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status_code=HTTPStatus.BAD_GATEWAY,
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detail=(
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f"Failed to get model info from {target_server_url}"
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f"Status: {response.status}, Response: {error_text}"
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),
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)
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model_info_json = await response.json()
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return ORJSONResponse(content=model_info_json)
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except aiohttp.ClientError as e:
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raise HTTPException(
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status_code=HTTPStatus.SERVICE_UNAVAILABLE,
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detail=f"Failed to get model info from backend",
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)
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@app.post("/generate")
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async def handle_generate_request(request_data: dict):
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prefill_server, bootstrap_port, decode_server = lb.select_pair()
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# Parse and transform prefill_server for bootstrap data
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parsed_url = urllib.parse.urlparse(prefill_server)
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hostname = maybe_wrap_ipv6_address(parsed_url.hostname)
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modified_request = request_data.copy()
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batch_size = _get_request_batch_size(modified_request)
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if batch_size is not None:
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modified_request.update(
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{
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"bootstrap_host": [hostname] * batch_size,
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"bootstrap_port": [bootstrap_port] * batch_size,
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"bootstrap_room": [
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_generate_bootstrap_room() for _ in range(batch_size)
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],
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}
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)
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else:
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modified_request.update(
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{
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"bootstrap_host": hostname,
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"bootstrap_port": bootstrap_port,
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"bootstrap_room": _generate_bootstrap_room(),
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}
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)
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if request_data.get("stream", False):
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return await lb.generate_stream(
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modified_request, prefill_server, decode_server, "generate"
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)
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else:
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return await lb.generate(
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modified_request, prefill_server, decode_server, "generate"
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)
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async def _forward_to_backend(request_data: dict, endpoint_name: str):
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prefill_server, bootstrap_port, decode_server = lb.select_pair()
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# Parse and transform prefill_server for bootstrap data
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parsed_url = urllib.parse.urlparse(prefill_server)
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hostname = maybe_wrap_ipv6_address(parsed_url.hostname)
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modified_request = request_data.copy()
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modified_request.update(
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{
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"bootstrap_host": hostname,
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"bootstrap_port": bootstrap_port,
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"bootstrap_room": _generate_bootstrap_room(),
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}
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)
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if request_data.get("stream", False):
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return await lb.generate_stream(
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modified_request,
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prefill_server,
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decode_server,
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endpoint=endpoint_name,
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)
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else:
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return await lb.generate(
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modified_request,
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prefill_server,
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decode_server,
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endpoint=endpoint_name,
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)
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@app.post("/v1/chat/completions")
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async def handle_chat_completion_request(request_data: dict):
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return await _forward_to_backend(request_data, "v1/chat/completions")
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@app.post("/v1/completions")
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async def handle_completion_request(request_data: dict):
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return await _forward_to_backend(request_data, "v1/completions")
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def _generate_bootstrap_room():
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return random.randint(0, 2**63 - 1)
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# We may utilize `GenerateReqInput`'s logic later
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def _get_request_batch_size(request):
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if (text := request.get("text")) is not None:
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return None if isinstance(text, str) else len(text)
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if (input_ids := request.get("input_ids")) is not None:
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return None if isinstance(input_ids[0], int) else len(input_ids)
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return None
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@app.get("/v1/models")
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async def get_models():
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prefill_server = lb.prefill_urls[0] # Get the first prefill server
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async with aiohttp.ClientSession() as session:
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try:
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response = await session.get(f"{prefill_server}/v1/models")
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if response.status != 200:
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raise HTTPException(
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status_code=response.status,
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detail=f"Prefill server error: Status {response.status}",
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)
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return ORJSONResponse(content=await response.json())
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except Exception as e:
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raise HTTPException(status_code=500, detail=str(e))
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