update VLLM api server to upstream

other/vllm/vllm_api_server.py

@@ -1,12 +1,13 @@
 import argparse
 import json
 import subprocess
+import sys
 import time
 from pathlib import Path
 from typing import AsyncGenerator
 
 import uvicorn
-from fastapi import BackgroundTasks, FastAPI, Request
+from fastapi import FastAPI, Request
 from fastapi.responses import JSONResponse, Response, StreamingResponse
 from vllm.engine.arg_utils import AsyncEngineArgs
 from vllm.engine.async_llm_engine import AsyncLLMEngine
@@ -15,8 +16,9 @@ from vllm.transformers_utils.tokenizer import get_tokenizer
 from vllm.utils import random_uuid
 
 TIMEOUT_KEEP_ALIVE = 5  # seconds.
-TIMEOUT_TO_PREVENT_DEADLOCK = 1  # seconds.
 app = FastAPI()
+engine = None
+tokenizer = None
 
 served_model = None
 model_config = {}
@@ -36,8 +38,14 @@ def get_gpu_pstate():
         return None
 
 
+@app.get("/health")
+async def health() -> Response:
+    """Health check."""
+    return Response(status_code=200)
+
+
 @app.get("/info")
-async def generate(request: Request) -> Response:
+async def info(request: Request) -> Response:
     return JSONResponse({
         'uptime': int(time.time() - startup_time),
         'startup_time': startup_time,
@@ -50,12 +58,12 @@ async def generate(request: Request) -> Response:
 
 
 @app.get("/model")
-async def generate(request: Request) -> Response:
+async def model(request: Request) -> Response:
     return JSONResponse({'model': served_model, 'timestamp': int(time.time())})
 
 
 @app.post("/tokenize")
-async def generate(request: Request) -> Response:
+async def tokenize(request: Request) -> Response:
     request_dict = await request.json()
     to_tokenize = request_dict.get("input")
     if not to_tokenize:
@@ -82,6 +90,7 @@ async def generate(request: Request) -> Response:
     stream = request_dict.pop("stream", False)
     sampling_params = SamplingParams(**request_dict)
     request_id = random_uuid()
+
     results_generator = engine.generate(prompt, sampling_params, request_id)
 
     # Streaming case
@@ -94,14 +103,8 @@ async def generate(request: Request) -> Response:
             ret = {"text": text_outputs}
             yield (json.dumps(ret) + "\0").encode("utf-8")
 
-    async def abort_request() -> None:
-        await engine.abort(request_id)
-
     if stream:
-        background_tasks = BackgroundTasks()
-        # Abort the request if the client disconnects.
-        background_tasks.add_task(abort_request)
-        return StreamingResponse(stream_results(), background=background_tasks)
+        return StreamingResponse(stream_results())
 
     # Non-streaming case
     final_output = None
@@ -121,19 +124,20 @@ async def generate(request: Request) -> Response:
 
 if __name__ == "__main__":
     parser = argparse.ArgumentParser()
-    parser.add_argument("--host", type=str, default="localhost")
+    parser.add_argument("--host", type=str, default=None)
     parser.add_argument("--port", type=int, default=8000)
     parser = AsyncEngineArgs.add_cli_args(parser)
     args = parser.parse_args()
     engine_args = AsyncEngineArgs.from_cli_args(args)
 
+    # Do some init setup before loading the model.
     model_path = Path(args.model)
     served_model = model_path.name
-
     try:
         model_config = json.loads((model_path / 'config.json').read_text())
     except Exception as e:
         print(f"Failed to load the model's config - {e.__class__.__name__}: {e}")
+        sys.exit(1)
 
     engine = AsyncLLMEngine.from_engine_args(engine_args)
     tokenizer = get_tokenizer(engine_args.tokenizer,