[Frontend] Support custom request_id from request

vllm/entrypoints/openai/protocol.py

@@ -284,6 +284,12 @@ class ChatCompletionRequest(OpenAIBaseModel):
             "The priority of the request (lower means earlier handling; "
             "default: 0). Any priority other than 0 will raise an error "
             "if the served model does not use priority scheduling."))
+    request_id: str = Field(
+        default_factory=lambda: f"{random_uuid()}",
+        description=(
+            "The request_id related to this request. If the caller does "
+            "not set it, a random_uuid will be generated. This id is used "
+            "through out the inference process and return in response."))
 
     # doc: end-chat-completion-extra-params
 

vllm/entrypoints/openai/serving_chat.py

@@ -38,7 +38,7 @@
 from vllm.tracing import (contains_trace_headers, extract_trace_headers,
                           log_tracing_disabled_warning)
 from vllm.transformers_utils.tokenizer import AnyTokenizer, MistralTokenizer
-from vllm.utils import iterate_with_cancellation, random_uuid
+from vllm.utils import iterate_with_cancellation
 
 logger = init_logger(__name__)
 
@@ -176,7 +176,7 @@ async def create_chat_completion(
                 "\"auto\" tool choice requires "
                 "--enable-auto-tool-choice and --tool-call-parser to be set")
 
-        request_id = f"chat-{random_uuid()}"
+        request_id = f"chat-{request.request_id}"
 
         request_metadata = RequestResponseMetadata(request_id=request_id)
         if raw_request: