migrate pydantic from v1 to v2 (vllm-project#2531)

requirements-neuron.txt

@@ -5,5 +5,5 @@ torch-neuronx >= 2.1.0
 neuronx-cc
 fastapi
 uvicorn[standard]
-pydantic == 1.10.13  # Required for OpenAI server.
+pydantic >= 2.0  # Required for OpenAI server.
 aioprometheus[starlette]

requirements-rocm.txt

@@ -9,5 +9,5 @@ tokenizers>=0.15.0
 transformers >= 4.36.0  # Required for Mixtral.
 fastapi
 uvicorn[standard]
-pydantic == 1.10.13  # Required for OpenAI server.
+pydantic >= 2.0  # Required for OpenAI server.
 aioprometheus[starlette]

requirements.txt

@@ -8,5 +8,5 @@ transformers >= 4.36.0  # Required for Mixtral.
 xformers == 0.0.23.post1  # Required for CUDA 12.1.
 fastapi
 uvicorn[standard]
-pydantic == 1.10.13  # Required for OpenAI server.
+pydantic >= 2.0  # Required for OpenAI server.
 aioprometheus[starlette]

vllm/entrypoints/openai/api_server.py

@@ -106,7 +106,7 @@ def parse_args():
 @app.exception_handler(RequestValidationError)
 async def validation_exception_handler(_, exc):
     err = openai_serving_chat.create_error_response(message=str(exc))
-    return JSONResponse(err.dict(), status_code=HTTPStatus.BAD_REQUEST)
+    return JSONResponse(err.model_dump(), status_code=HTTPStatus.BAD_REQUEST)
 
 
 @app.get("/health")
@@ -118,30 +118,36 @@ async def health() -> Response:
 @app.get("/v1/models")
 async def show_available_models():
     models = await openai_serving_chat.show_available_models()
-    return JSONResponse(content=models.dict())
+    return JSONResponse(content=models.model_dump())
 
 
 @app.post("/v1/chat/completions")
 async def create_chat_completion(request: ChatCompletionRequest,
                                  raw_request: Request):
     generator = await openai_serving_chat.create_chat_completion(
         request, raw_request)
-    if request.stream and not isinstance(generator, ErrorResponse):
+    if isinstance(generator, ErrorResponse):
+        return JSONResponse(content=generator.model_dump(),
+                            status_code=generator.code)
+    if request.stream:
         return StreamingResponse(content=generator,
                                  media_type="text/event-stream")
     else:
-        return JSONResponse(content=generator.dict())
+        return JSONResponse(content=generator.model_dump())
 
 
 @app.post("/v1/completions")
 async def create_completion(request: CompletionRequest, raw_request: Request):
     generator = await openai_serving_completion.create_completion(
         request, raw_request)
-    if request.stream and not isinstance(generator, ErrorResponse):
+    if isinstance(generator, ErrorResponse):
+        return JSONResponse(content=generator.model_dump(),
+                            status_code=generator.code)
+    if request.stream:
         return StreamingResponse(content=generator,
                                  media_type="text/event-stream")
     else:
-        return JSONResponse(content=generator.dict())
+        return JSONResponse(content=generator.model_dump())
 
 
 if __name__ == "__main__":

vllm/entrypoints/openai/protocol.py

@@ -14,7 +14,7 @@ class ErrorResponse(BaseModel):
     message: str
     type: str
     param: Optional[str] = None
-    code: Optional[str] = None
+    code: int
 
 
 class ModelPermission(BaseModel):
@@ -189,7 +189,7 @@ class CompletionStreamResponse(BaseModel):
     created: int = Field(default_factory=lambda: int(time.time()))
     model: str
     choices: List[CompletionResponseStreamChoice]
-    usage: Optional[UsageInfo]
+    usage: Optional[UsageInfo] = Field(default=None)
 
 
 class ChatMessage(BaseModel):
@@ -229,5 +229,4 @@ class ChatCompletionStreamResponse(BaseModel):
     created: int = Field(default_factory=lambda: int(time.time()))
     model: str
     choices: List[ChatCompletionResponseStreamChoice]
-    usage: Optional[UsageInfo] = Field(
-        default=None, description="data about request and response")
+    usage: Optional[UsageInfo] = Field(default=None)

vllm/entrypoints/openai/serving_chat.py

@@ -102,7 +102,7 @@ async def chat_completion_stream_generator(
                                                  created=created_time,
                                                  choices=[choice_data],
                                                  model=model_name)
-            data = chunk.json(exclude_unset=True, ensure_ascii=False)
+            data = chunk.model_dump_json(exclude_unset=True)
             yield f"data: {data}\n\n"
 
         # Send response to echo the input portion of the last message
@@ -125,7 +125,7 @@ async def chat_completion_stream_generator(
                         created=created_time,
                         choices=[choice_data],
                         model=model_name)
-                    data = chunk.json(exclude_unset=True, ensure_ascii=False)
+                    data = chunk.model_dump_json(exclude_unset=True)
                     yield f"data: {data}\n\n"
 
         # Send response for each token for each request.n (index)
@@ -156,7 +156,7 @@ async def chat_completion_stream_generator(
                         created=created_time,
                         choices=[choice_data],
                         model=model_name)
-                    data = chunk.json(exclude_unset=True, ensure_ascii=False)
+                    data = chunk.model_dump_json(exclude_unset=True)
                     yield f"data: {data}\n\n"
                 else:
                     # Send the finish response for each request.n only once
@@ -178,9 +178,8 @@ async def chat_completion_stream_generator(
                         model=model_name)
                     if final_usage is not None:
                         chunk.usage = final_usage
-                    data = chunk.json(exclude_unset=True,
-                                      exclude_none=True,
-                                      ensure_ascii=False)
+                    data = chunk.model_dump_json(exclude_unset=True,
+                                                 exclude_none=True)
                     yield f"data: {data}\n\n"
                     finish_reason_sent[i] = True
         # Send the final done message after all response.n are finished

vllm/entrypoints/openai/serving_completion.py

@@ -74,7 +74,7 @@ async def completion_stream_generator(
                         logprobs=logprobs,
                         finish_reason=finish_reason,
                     )
-                ]).json(exclude_unset=True, ensure_ascii=False)
+                ]).model_dump_json(exclude_unset=True)
             yield f"data: {response_json}\n\n"
 
             if output.finish_reason is not None:
@@ -99,7 +99,7 @@ async def completion_stream_generator(
                         )
                     ],
                     usage=final_usage,
-                ).json(exclude_unset=True, ensure_ascii=False)
+                ).model_dump_json(exclude_unset=True)
                 yield f"data: {response_json}\n\n"
 
     yield "data: [DONE]\n\n"
@@ -279,7 +279,7 @@ async def create_completion(self, request: CompletionRequest,
         # When user requests streaming but we don't stream, we still need to
         # return a streaming response with a single event.
         if request.stream:
-            response_json = response.json(ensure_ascii=False)
+            response_json = response.model_dump_json()
 
             async def fake_stream_generator() -> AsyncGenerator[str, None]:
                 yield f"data: {response_json}\n\n"