Add sdk for Agent API (#3220)

### What problem does this PR solve?

Add sdk for Agent API

### Type of change

- [x] New Feature (non-breaking change which adds functionality)

---------

Co-authored-by: liuhua <10215101452@stu.ecun.edu.cn>

sdk/python/ragflow_sdk/modules/agent.py

@@ -0,0 +1,59 @@
+from .base import Base
+from .session import Session
+import requests
+
+class Agent(Base):
+    def __init__(self,rag,res_dict):
+        self.id  = None
+        self.avatar = None
+        self.canvas_type = None
+        self.description = None
+        self.dsl = None
+        super().__init__(rag, res_dict)
+
+    class Dsl(Base):
+        def __init__(self,rag,res_dict):
+            self.answer = []
+            self.components = {
+                "begin": {
+                    "downstream": ["Answer:China"],
+                    "obj": {
+                        "component_name": "Begin",
+                        "params": {}
+                    },
+                    "upstream": []
+                }
+            }
+            self.graph = {
+                "edges": [],
+                "nodes": [
+                    {
+                        "data": {
+                            "label": "Begin",
+                            "name": "begin"
+                        },
+                        "id": "begin",
+                        "position": {
+                            "x": 50,
+                            "y": 200
+                        },
+                        "sourcePosition": "left",
+                        "targetPosition": "right",
+                        "type": "beginNode"
+                    }
+                ]
+            }
+            self.history =  []
+            self.messages =  []
+            self.path =  []
+            self.reference = []
+            super().__init__(rag,res_dict)
+
+    @staticmethod
+    def create_session(id,rag) -> Session:
+        res = requests.post(f"http://127.0.0.1:9380/api/v1/agents/{id}/sessions",headers={"Authorization": f"Bearer {rag.user_key}"},json={})
+        res = res.json()
+        if res.get("code") == 0:
+            return Session(rag,res.get("data"))
+        raise Exception(res.get("message"))
+

sdk/python/ragflow_sdk/modules/session.py

@@ -9,14 +9,19 @@ class Session(Base):
         self.name = "New session"
         self.messages = [{"role": "assistant", "content": "Hi! I am your assistant，can I help you?"}]
         self.chat_id = None
+        self.agent_id = None
+        for key,value in res_dict.items():
+            if key =="chat_id" and value is not None:
+                self.__session_type = "chat"
+            if key == "agent_id" and value is not None:
+                self.__session_type = "agent"
         super().__init__(rag, res_dict)
 
-    def ask(self, question: str, stream: bool = False):
-        for message in self.messages:
-            if "reference" in message:
-                message.pop("reference")
-        res = self.post(f"/chats/{self.chat_id}/completions",
-                        {"question": question, "stream": True,"session_id":self.id}, stream=stream)
+    def ask(self, question):
+        if self.__session_type == "agent":
+            res=self._ask_agent(question)
+        elif self.__session_type == "chat":
+            res=self._ask_chat(question)
         for line in res.iter_lines():
             line = line.decode("utf-8")
             if line.startswith("{"):
@@ -33,25 +38,20 @@ class Session(Base):
                     }
                     if "chunks" in reference:
                         chunks = reference["chunks"]
-                        chunk_list = []
-                        for chunk in chunks:
-                            new_chunk = {
-                                "id": chunk["chunk_id"],
-                                "content": chunk["content_with_weight"],
-                                "document_id": chunk["doc_id"],
-                                "document_name": chunk["docnm_kwd"],
-                                "dataset_id": chunk["kb_id"],
-                                "image_id": chunk["img_id"],
-                                "similarity": chunk["similarity"],
-                                "vector_similarity": chunk["vector_similarity"],
-                                "term_similarity": chunk["term_similarity"],
-                                "positions": chunk["positions"],
-                            }
-                            chunk_list.append(new_chunk)
-                        temp_dict["reference"] = chunk_list
+                        temp_dict["reference"] = chunks
                     message = Message(self.rag, temp_dict)
                     yield message
 
+
+    def _ask_chat(self, question: str, stream: bool = False):
+        res = self.post(f"/chats/{self.chat_id}/completions",
+                        {"question": question, "stream": True,"session_id":self.id}, stream=stream)
+        return res
+    def _ask_agent(self,question:str,stream:bool=False):
+        res = self.post(f"/agents/{self.agent_id}/completions",
+                        {"question": question, "stream": True,"session_id":self.id}, stream=stream)
+        return res
+
     def update(self,update_message):
         res = self.put(f"/chats/{self.chat_id}/sessions/{self.id}",
                         update_message)
@@ -66,20 +66,4 @@ class Message(Base):
         self.role = "assistant"
         self.prompt = None
         self.id = None
-        super().__init__(rag, res_dict)
-
-
-class Chunk(Base):
-    def __init__(self, rag, res_dict):
-        self.id = None
-        self.content = None
-        self.document_id = ""
-        self.document_name = ""
-        self.dataset_id = ""
-        self.image_id = ""
-        self.similarity = None
-        self.vector_similarity = None
-        self.term_similarity = None
-        self.positions = None
-        super().__init__(rag, res_dict)
-
+        super().__init__(rag, res_dict)