feat: log input text for OpenAI format API

To fix #1608

Signed-off-by: Peter Pan <[email protected]>

python/sglang/srt/openai_api/adapter.py

@@ -866,6 +866,14 @@ def v1_chat_generate_request(
     orchestrator,
     request_ids: List[str] = None,
 ):
+    def format_openai_content_for_logging(content):
+        if isinstance(content, dict) and "text" in content:
+            return content["text"]
+        elif isinstance(content, list):
+            return " ".join(map(str, content))
+        else:
+            return str(content)
+
     input_ids = []
     sampling_params_list = []
     image_data_list = []
@@ -995,11 +1003,29 @@ def v1_chat_generate_request(
 
         image_data_list.append(image_data)
         modalities_list.append(modalities)
+
+    # User input context for logging
+
+    user_content_text = ""
+    if orchestrator.server_args.log_requests:
+        user_content_text = (
+            " ".join(
+                [
+                    format_openai_content_for_logging(msg.content)
+                    for msg in request.messages
+                    if msg.role == "user"
+                ]
+            )
+            if request.messages
+            else ""
+        )
+
     if len(all_requests) == 1:
         if isinstance(input_ids[0], str):
             prompt_kwargs = {"text": input_ids[0]}
         else:
-            prompt_kwargs = {"input_ids": input_ids[0]}
+            prompt_kwargs = {"input_ids": input_ids[0], "text": user_content_text}
+
         sampling_params_list = sampling_params_list[0]
         image_data_list = image_data_list[0]
         return_logprobs = return_logprobs[0]
@@ -1010,8 +1036,9 @@ def v1_chat_generate_request(
     else:
         if isinstance(input_ids[0], str):
             prompt_kwargs = {"text": input_ids}
+
         else:
-            prompt_kwargs = {"input_ids": input_ids}
+            prompt_kwargs = {"input_ids": input_ids[0], "text": user_content_text}
 
     adapted_request = GenerateReqInput(
         **prompt_kwargs,