[CI][Bugfix] Fix 500 errors from priority overflow and TemplateError subclasses in schema fuzz tests (#37127)

Signed-off-by: Andreas Karatzas <akaratza@amd.com>

vllm/entrypoints/openai/chat_completion/protocol.py

@@ -7,7 +7,6 @@ import json
 import time
 from typing import Annotated, Any, ClassVar, Literal
 
-import torch
 from openai.types.chat.chat_completion_audio import (
     ChatCompletionAudio as OpenAIChatCompletionAudio,
 )
@@ -48,7 +47,8 @@ from vllm.utils import random_uuid
 logger = init_logger(__name__)
 
 
-_LONG_INFO = torch.iinfo(torch.long)
+_INT64_MIN = -(2**63)
+_INT64_MAX = 2**63 - 1
 
 
 class ChatMessage(OpenAIBaseModel):
@@ -165,7 +165,7 @@ class ChatCompletionRequest(OpenAIBaseModel):
     n: int | None = 1
     presence_penalty: float | None = 0.0
     response_format: AnyResponseFormat | None = None
-    seed: int | None = Field(None, ge=_LONG_INFO.min, le=_LONG_INFO.max)
+    seed: int | None = Field(None, ge=_INT64_MIN, le=_INT64_MAX)
     stop: str | list[str] | None = []
     stream: bool | None = False
     stream_options: StreamOptions | None = None
@@ -198,9 +198,7 @@ class ChatCompletionRequest(OpenAIBaseModel):
     min_tokens: int = 0
     skip_special_tokens: bool = True
     spaces_between_special_tokens: bool = True
-    truncate_prompt_tokens: Annotated[int, Field(ge=-1, le=_LONG_INFO.max)] | None = (
-        None
-    )
+    truncate_prompt_tokens: Annotated[int, Field(ge=-1, le=_INT64_MAX)] | None = None
     prompt_logprobs: int | None = None
     allowed_token_ids: list[int] | None = None
     bad_words: list[str] = Field(default_factory=list)
@@ -285,6 +283,8 @@ class ChatCompletionRequest(OpenAIBaseModel):
     )
     priority: int = Field(
         default=0,
+        ge=_INT64_MIN,
+        le=_INT64_MAX,
         description=(
             "The priority of the request (lower means earlier handling; "
             "default: 0). Any priority other than 0 will raise an error "

vllm/entrypoints/openai/chat_completion/serving.py

@@ -6,6 +6,7 @@ import json
 import time
 from collections.abc import AsyncGenerator, AsyncIterator
 from collections.abc import Sequence as GenericSequence
+from http import HTTPStatus
 from typing import TYPE_CHECKING, Any, Final
 
 import partial_json_parser
@@ -1289,7 +1290,12 @@ class OpenAIServingChat(OpenAIServing):
         except asyncio.CancelledError:
             return self.create_error_response("Client disconnected")
 
-        assert final_res is not None
+        if final_res is None:
+            return self.create_error_response(
+                "No output received from the engine.",
+                err_type="InternalServerError",
+                status_code=HTTPStatus.INTERNAL_SERVER_ERROR,
+            )
 
         choices: list[ChatCompletionResponseChoice] = []
         if self.tool_call_id_type == "kimi_k2":