Rename get_user_message to get_last_user_message for clarity and update usage in http_bot

app.py

@@ -246,7 +246,7 @@ def http_bot(
 
     try:
         # Stream output
-        message = state.get_user_message(source=state.USER)
+        message = state.get_last_user_message(source=state.USER)
         logger.info(f"==== User message ====\n{message}")
         logger.info(f"==== Image paths ====\n{all_image_paths}")
 

conversation.py

@@ -174,14 +174,14 @@ class Conversation:
 
         return images
     
-    def get_user_message(self, source: Union[str, None] = None):
+    def get_last_user_message(self, source: Union[str, None] = None):
         assert len(self.messages) > 0, "No message in the conversation."
         assert source in [self.USER, self.ASSISTANT, None], f"Invalid source: {source}"
-        for i, msg in enumerate(self.messages):
-            if source and msg["role"] != source:
+        for i in range(len(self.messages) - 1, -1, -1):
+            if source and self.messages[i]["role"] != source:
                 continue
-            if msg["role"] == self.USER:
-                return msg["content"]
+            if self.messages[i]["role"] == self.USER:
+                return self.messages[i]["content"]
 
     def to_gradio_chatbot(self):
         ret = []