[OpenAI] Log raw request payload for --log-requests (#20605)

python/sglang/srt/entrypoints/openai/serving_base.py

@@ -84,6 +84,11 @@ class OpenAIServingBase(ABC):
             if error_msg:
                 return self.create_error_response(error_msg)
 
+            # Log the raw OpenAI request payload before conversion to tokenized form.
+            request_logger = self.tokenizer_manager.request_logger
+            if request_logger.log_requests and request_logger.log_requests_level >= 2:
+                request_logger.log_openai_received_request(request, request=raw_request)
+
             # Convert to internal format
             adapted_request, processed_request = self._convert_to_internal_request(
                 request, raw_request

python/sglang/srt/utils/request_logger.py

@@ -130,6 +130,34 @@ class RequestLogger:
                 decoded = tokenizer.decode(obj.input_ids, skip_special_tokens=False)
             obj.text = decoded
 
+    def log_openai_received_request(
+        self,
+        obj: Any,
+        request: Optional["fastapi.Request"] = None,
+    ) -> None:
+        """Log the raw OpenAI request payload before request adaptation/tokenization."""
+        max_length, _, _ = self.metadata
+        max_length = max_length if max_length is not None else 2048
+        headers = _extract_whitelisted_headers(request)
+
+        if hasattr(obj, "model_dump"):
+            obj_to_log = obj.model_dump(exclude_none=True)
+        else:
+            obj_to_log = obj
+
+        if self.log_requests_format == "json":
+            log_data = {
+                "obj": _transform_data_for_logging(obj_to_log, max_length=max_length),
+            }
+            if headers:
+                log_data["headers"] = headers
+            log_json(self.targets, "request.received.openai", log_data)
+        else:
+            headers_str = f", headers={headers}" if headers else ""
+            self._log(
+                f"Receive OpenAI: obj={_dataclass_to_string_truncated(obj_to_log, max_length)}{headers_str}"
+            )
+
     def log_finished_request(
         self,
         obj: Union["GenerateReqInput", "EmbeddingReqInput"],