fix agent

app/agent/callback/__init__.py

@@ -0,0 +1,33 @@
+import threading
+
+from langchain_core.callbacks import AsyncCallbackHandler
+
+from app.log import logger
+
+
+class StreamingCallbackHandler(AsyncCallbackHandler):
+    """流式输出回调处理器"""
+
+    def __init__(self, session_id: str):
+        self._lock = threading.Lock()
+        self.session_id = session_id
+        self.current_message = ""
+
+    async def get_message(self):
+        """获取当前消息内容，获取后清空"""
+        with self._lock:
+            if not self.current_message:
+                return ""
+            msg = self.current_message
+            logger.info(f"Agent消息: {msg}")
+            self.current_message = ""
+            return msg
+
+    async def on_llm_new_token(self, token: str, **kwargs):
+        """处理新的token"""
+        if not token:
+            return
+        with self._lock:
+            # 缓存当前消息
+            self.current_message += token
+