320 lines
9.8 KiB
Python
320 lines
9.8 KiB
Python
"""SRT: SGLang Runtime"""
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import asyncio
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import dataclasses
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import json
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import logging
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import multiprocessing as mp
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import os
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import sys
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import threading
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import time
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from typing import List, Optional, Union
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# Fix a bug of Python threading
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setattr(threading, "_register_atexit", lambda *args, **kwargs: None)
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import aiohttp
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import psutil
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import requests
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import uvicorn
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import uvloop
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from fastapi import FastAPI, Request
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from fastapi.responses import JSONResponse, Response, StreamingResponse
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from sglang.backend.runtime_endpoint import RuntimeEndpoint
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from sglang.srt.constrained import disable_cache
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from sglang.srt.hf_transformers_utils import get_tokenizer
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from sglang.srt.managers.detokenizer_manager import start_detokenizer_process
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from sglang.srt.managers.io_struct import GenerateReqInput
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from sglang.srt.managers.router.manager import start_router_process
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from sglang.srt.managers.tokenizer_manager import TokenizerManager
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from sglang.srt.openai_api_adapter import (
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v1_completions, v1_chat_completions, load_chat_template_for_openai_api)
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from sglang.srt.server_args import PortArgs, ServerArgs
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from sglang.srt.utils import (
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allocate_init_ports,
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assert_pkg_version,
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enable_show_time_cost,
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get_exception_traceback,
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API_KEY_HEADER_NAME,
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APIKeyValidatorMiddleware
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)
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asyncio.set_event_loop_policy(uvloop.EventLoopPolicy())
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app = FastAPI()
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tokenizer_manager = None
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@app.get("/health")
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async def health() -> Response:
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"""Health check."""
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return Response(status_code=200)
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@app.get("/get_model_info")
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async def get_model_info():
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result = {
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"model_path": tokenizer_manager.model_path,
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}
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return result
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@app.get("/get_server_args")
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async def get_server_args():
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return dataclasses.asdict(tokenizer_manager.server_args)
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@app.get("/flush_cache")
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async def flush_cache():
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await tokenizer_manager.flush_cache()
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return Response(
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content="Cache flushed.\nPlease check backend logs for more details. "
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"(When there are running or waiting requests, the operation will not be performed.)\n",
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status_code=200,
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)
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@app.post("/generate")
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async def generate_request(obj: GenerateReqInput):
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obj.post_init()
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if obj.stream:
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async def stream_results():
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async for out in tokenizer_manager.generate_request(obj):
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yield f"data: {json.dumps(out, ensure_ascii=False)}\n\n"
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yield "data: [DONE]\n\n"
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return StreamingResponse(stream_results(), media_type="text/event-stream")
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try:
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ret = await tokenizer_manager.generate_request(obj).__anext__()
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return ret
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except ValueError as e:
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return JSONResponse({"error": str(e)}, status_code=400)
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@app.post("/v1/completions")
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async def openai_v1_completions(raw_request: Request):
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return await v1_completions(tokenizer_manager, raw_request)
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@app.post("/v1/chat/completions")
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async def openai_v1_chat_completions(raw_request: Request):
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return await v1_chat_completions(tokenizer_manager, raw_request)
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def launch_server(server_args: ServerArgs, pipe_finish_writer):
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global tokenizer_manager
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logging.basicConfig(
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level=getattr(logging, server_args.log_level.upper()),
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format="%(message)s",
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)
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# Set global environments
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os.environ["TF_CPP_MIN_LOG_LEVEL"] = "3"
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if server_args.show_time_cost:
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enable_show_time_cost()
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if server_args.disable_disk_cache:
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disable_cache()
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if server_args.enable_flashinfer:
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assert_pkg_version("flashinfer", "0.0.4")
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if server_args.chat_template:
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# TODO: replace this with huggingface transformers template
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load_chat_template_for_openai_api(server_args.chat_template)
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# Allocate ports
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server_args.port, server_args.additional_ports = allocate_init_ports(
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server_args.port, server_args.additional_ports, server_args.tp_size
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)
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port_args = PortArgs(
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tokenizer_port=server_args.additional_ports[0],
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router_port=server_args.additional_ports[1],
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detokenizer_port=server_args.additional_ports[2],
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nccl_port=server_args.additional_ports[3],
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model_rpc_ports=server_args.additional_ports[4:],
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)
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# Launch processes
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tokenizer_manager = TokenizerManager(server_args, port_args)
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pipe_router_reader, pipe_router_writer = mp.Pipe(duplex=False)
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pipe_detoken_reader, pipe_detoken_writer = mp.Pipe(duplex=False)
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proc_router = mp.Process(
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target=start_router_process,
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args=(
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server_args,
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port_args,
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pipe_router_writer,
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),
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)
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proc_router.start()
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proc_detoken = mp.Process(
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target=start_detokenizer_process,
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args=(
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server_args,
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port_args,
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pipe_detoken_writer,
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),
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)
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proc_detoken.start()
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# Wait for the model to finish loading
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router_init_state = pipe_router_reader.recv()
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detoken_init_state = pipe_detoken_reader.recv()
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if router_init_state != "init ok" or detoken_init_state != "init ok":
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proc_router.kill()
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proc_detoken.kill()
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print(f"Initialization failed. router_init_state: {router_init_state}", flush=True)
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print(f"Initialization failed. detoken_init_state: {detoken_init_state}", flush=True)
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sys.exit(1)
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assert proc_router.is_alive() and proc_detoken.is_alive()
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if server_args.api_key and server_args.api_key != "":
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app.add_middleware(APIKeyValidatorMiddleware, api_key=server_args.api_key)
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def _wait_and_warmup():
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headers = {}
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url = server_args.url()
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if server_args.api_key:
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headers[API_KEY_HEADER_NAME] = server_args.api_key
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# Wait until the server is launched
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for _ in range(120):
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time.sleep(0.5)
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try:
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requests.get(url + "/get_model_info", timeout=5, headers=headers)
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break
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except requests.exceptions.RequestException as e:
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pass
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# Send a warmup request
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try:
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res = requests.post(
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url + "/generate",
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json={
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"text": "Say this is a warmup request.",
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"sampling_params": {
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"temperature": 0,
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"max_new_tokens": 16,
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},
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},
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headers=headers,
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timeout=60,
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)
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assert res.status_code == 200
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except Exception as e:
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if pipe_finish_writer is not None:
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pipe_finish_writer.send(get_exception_traceback())
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print(f"Initialization failed. warmup error: {e}")
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raise e
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if pipe_finish_writer is not None:
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pipe_finish_writer.send("init ok")
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t = threading.Thread(target=_wait_and_warmup)
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t.start()
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try:
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uvicorn.run(
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app,
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host=server_args.host,
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port=server_args.port,
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log_level=server_args.log_level,
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timeout_keep_alive=5,
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loop="uvloop",
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)
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finally:
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t.join()
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class Runtime:
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def __init__(
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self,
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log_evel="error",
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*args,
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**kwargs,
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):
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"""See the arguments in server_args.py::ServerArgs"""
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self.server_args = ServerArgs(*args, log_level=log_evel, **kwargs)
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# Pre-allocate ports
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self.server_args.port, self.server_args.additional_ports = allocate_init_ports(
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self.server_args.port, self.server_args.additional_ports, self.server_args.tp_size)
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self.url = self.server_args.url()
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self.generate_url = (
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f"http://{self.server_args.host}:{self.server_args.port}/generate"
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)
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self.pid = None
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pipe_reader, pipe_writer = mp.Pipe(duplex=False)
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proc = mp.Process(target=launch_server, args=(self.server_args, pipe_writer))
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proc.start()
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pipe_writer.close()
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self.pid = proc.pid
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try:
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init_state = pipe_reader.recv()
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except EOFError:
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init_state = ""
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if init_state != "init ok":
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self.shutdown()
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raise RuntimeError("Initialization failed. Please see the error messages above.")
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self.endpoint = RuntimeEndpoint(self.url)
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def shutdown(self):
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if self.pid is not None:
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try:
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parent = psutil.Process(self.pid)
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except psutil.NoSuchProcess:
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return
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children = parent.children(recursive=True)
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for child in children:
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child.kill()
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psutil.wait_procs(children, timeout=5)
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parent.kill()
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parent.wait(timeout=5)
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self.pid = None
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def get_tokenizer(self):
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return get_tokenizer(
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self.server_args.tokenizer_path,
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tokenizer_mode=self.server_args.tokenizer_mode,
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trust_remote_code=self.server_args.trust_remote_code,
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)
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async def add_request(
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self,
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prompt: str,
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sampling_params,
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):
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json_data = {
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"text": prompt,
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"sampling_params": sampling_params,
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"stream": True,
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}
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pos = 0
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timeout = aiohttp.ClientTimeout(total=3 * 3600)
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async with aiohttp.ClientSession(timeout=timeout, trust_env=True) as session:
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async with session.post(self.generate_url, json=json_data) as response:
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async for chunk, _ in response.content.iter_chunks():
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chunk = chunk.decode("utf-8")
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if chunk and chunk.startswith("data:"):
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if chunk == "data: [DONE]\n\n":
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break
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data = json.loads(chunk[5:].strip("\n"))
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cur = data["text"][pos:]
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if cur:
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yield cur
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pos += len(cur)
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def __del__(self):
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self.shutdown() |