完善接口，实现对DIFY前端消息流传输的支持

backend/app/api/routers/app.py

@@ -1,6 +1,7 @@
 import asyncio
 import json
 import logging
+import time
 from typing import Dict, List, Any, Optional, AsyncGenerator
 
 from aiostream import stream
@@ -22,8 +23,6 @@ logger = logging.getLogger("uvicorn")
 api_router = r = APIRouter()
 v1_router = v = APIRouter()
 
-default_conversation_id = '82e8417f-2c3b-4bb5-ab22-2ad318bbd29a'
-
 class ChatCallbackEvent(BaseModel):
     event_type: CBEventType
     payload: Optional[Dict[str, Any]] = None
@@ -112,11 +111,11 @@ class ChatEventCallbackHandler(BaseCallbackHandler):
     ):
         """Initialize the base callback handler."""
         ignored_events = [
-            CBEventType.CHUNKING,
-            CBEventType.NODE_PARSING,
-            CBEventType.EMBEDDING,
-            CBEventType.LLM,
-            CBEventType.TEMPLATING,
+            # CBEventType.CHUNKING,
+            # CBEventType.NODE_PARSING,
+            # CBEventType.EMBEDDING,
+            # CBEventType.LLM,
+            # CBEventType.TEMPLATING,
         ]
         super().__init__(ignored_events, ignored_events)
         self._aqueue = asyncio.Queue()
@@ -128,6 +127,8 @@ class ChatEventCallbackHandler(BaseCallbackHandler):
             event_id: str = "",
             **kwargs: Any,
     ) -> str:
+        logger.info("event_start:{} type:{} payload:{}\n".format(event_id, event_type, payload))
+
         event = ChatCallbackEvent(event_id=event_id, event_type=event_type, payload=payload)
         if event.to_response() is not None:
             self._aqueue.put_nowait(event)
@@ -139,12 +140,14 @@ class ChatEventCallbackHandler(BaseCallbackHandler):
             event_id: str = "",
             **kwargs: Any,
     ) -> None:
+        logger.info("event_end:{} type:{} payload:{}\n".format(event_id, event_type, payload))
         event = ChatCallbackEvent(event_id=event_id, event_type=event_type, payload=payload)
         if event.to_response() is not None:
             self._aqueue.put_nowait(event)
 
     def start_trace(self, trace_id: Optional[str] = None) -> None:
         """No-op."""
+        logger.info("trace_start:{}\n".format(trace_id))
 
     def end_trace(
             self,
@@ -152,6 +155,7 @@ class ChatEventCallbackHandler(BaseCallbackHandler):
             trace_map: Optional[Dict[str, List[str]]] = None,
     ) -> None:
         """No-op."""
+        logger.info("trace_end:{} trace_map:{}\n".format(trace_id, trace_map))
 
     async def async_event_gen(self) -> AsyncGenerator[ChatCallbackEvent, None]:
         while not self._aqueue.empty() or not self.is_done:
@@ -173,7 +177,7 @@ class DifyChatResponseEvent(BaseModel):
     event: str
     conversation_id: str 
     message_id: str 
-    created_at: int = 1724406492
+    created_at: int = int(time.time())
     task_id: str 
 
 class Workflow_started_DifyChatResponseEvent(DifyChatResponseEvent):
@@ -190,7 +194,7 @@ class Workflow_started_DifyChatResponseEvent(DifyChatResponseEvent):
                 "sys.conversation_id":  args['conversation_id'],
                 "sys.user_id": args['use_id']
             },
-            "created_at": 1724406492
+            "created_at": int(time.time())
         }
         args['event'] = 'workflow_started'
         super().__init__(**args)
@@ -216,8 +220,8 @@ class Workflow_finished_DifyChatResponseEvent(DifyChatResponseEvent):
 			"id": str(uuid.uuid4()),
 			"user": args['use_id']
 		    },
-		    "created_at": 1724406492,
-		    "finished_at": 1724406528,
+		    "created_at": int(time.time()),
+		    "finished_at": int(time.time()),
 		    "files": []
         }
         super().__init__(**args)
@@ -245,20 +249,20 @@ class ChatStreamResponse(StreamingResponse):
     @classmethod
     def convert_text(cls, token: str):
         # Escape newlines and double quotes to avoid breaking the stream
-        token = json.dumps(token)
+        #token = json.dumps(token)
 
         #return f"data: {{"event": "message", "conversation_id": "80d85523-de92-4b9d-aca0-c48a5eacb068", "message_id": "16a06b1b-a89b-49c0-bc15-123bd999f6d6", "created_at": 1724406492, "task_id": "802f3064-030d-42ac-a882-0e1293712d04", "id": "16a06b1b-a89b-49c0-bc15-123bd999f6d6", "answer": "{token}"}}"
-        return ""
+        return "\n"
 
     @classmethod
     def convert_data(cls, data: dict):
         data_str = json.dumps(data)
-        return f"{cls.DATA_PREFIX}{data_str}\n"
+        return f"{cls.DATA_PREFIX}{data_str}\n\n"
 
     @classmethod
     def convert_event(cls, event: DifyChatResponseEvent):
         data_str = json.dumps(event.dict())
-        return f"{cls.DATA_PREFIX}{data_str}\n"
+        return f"{cls.DATA_PREFIX}{data_str}\n\n"
 
     def __init__(
             self,
@@ -314,7 +318,7 @@ class ChatStreamResponse(StreamingResponse):
             async for event in event_handler.async_event_gen():
                 event_response = event.to_response()
                 if event_response is not None:
-                    yield ChatStreamResponse.convert_data(event_response)
+                    yield ChatStreamResponse.convert_text("")
 
         combine = stream.merge(_chat_response_generator(), _event_generator())
         is_stream_started = False
@@ -345,12 +349,12 @@ class ChatStreamResponse(StreamingResponse):
 @v.post("/chat-messages")
 async def post_conversations(request: Request, data: ChatRequestData):
     userMng.findNoExistCreate(data.user)
-    data.conversation_id = default_conversation_id if data.conversation_id is None else data.conversation_id
+    data.conversation_id = data.conversation_id if data.conversation_id else str(uuid.uuid4())
 
     conversaObj = conversations()
-    conversationinfo = conversaObj.get(data.user, data.conversation_id)
+    conversationinfo = conversaObj.get(data.conversation_id)
     if conversationinfo is None:
-        conversationinfo = conversaObj.add(data.user, "新建会话", data.conversation_id)
+        conversationinfo = conversaObj.add(data.conversation_id, data.user, "新建会话")
 
     # 生成聊天参数
     last_message_content = ChatMessage.from_str(data.query)
@@ -372,9 +376,16 @@ async def post_conversations(request: Request, data: ChatRequestData):
 
 @v.get("/messages")
 async def query_messages(user:str, conversation_id:str):
-    conversation_id = default_conversation_id if conversation_id is None else conversation_id
+    #conversation_id = default_conversation_id if conversation_id is None else conversation_id
     datas = []
     records = message().gets(user,conversation_id)
+    if records is None:
+        return {
+            "limit": 20,
+            "has_more": False,
+            "data": []
+        }
+
     for record in records:
         res = record.dict()
         res["message_files"] = []
@@ -415,7 +426,7 @@ async def post_conversations(request: Request,itemid:str,params:Dict[str,Any]):
     return 'null'
 
 @v.get("/conversations")
-async def query_conversations(user:str):
+async def query_conversations(user:str, first_id:str = None, limit:str = None, pinned:str = None):
     user_id = '' if user is None else user
     userMng.findNoExistCreate(user_id)
 

backend/app/api/routers/request/base.py

@@ -18,13 +18,13 @@ class conversations:
 
         return datas
 
-    def get(self,user_id:str,id:str = ''):
-        records = dbManage.query(self._tableName,user_id = user_id,id=id)
+    def get(self, id:str):
+        records = dbManage.query(self._tableName, id=id)
         if len(records) >0:
             return records[0]
         return None
 
-    def add(self,user_id:str,name:str,id:str = ''):
+    def add(self,id:str, user_id:str, name:str):
         template = BaseConfig.ConversationCfg
         template['id'] = id
         template['user_id'] = user_id