Refactoring: Agent completions API change response structure (#9631)

### What problem does this PR solve?

Resolve #9549 and #9436 , In v0.20.x,Agent completions API changed a
lot,such as without reference and so on

### Type of change

- [x] Refactoring

api/apps/sdk/session.py

@@ -450,37 +450,26 @@ def agents_completion_openai_compatibility(tenant_id, agent_id):
 def agent_completions(tenant_id, agent_id):
     req = request.json
 
-    ans = {}
+
     if req.get("stream", True):
-
+        resp = Response(agent_completion(tenant_id=tenant_id, agent_id=agent_id, **req), mimetype="text/event-stream")
-        def generate():
-            for answer in agent_completion(tenant_id=tenant_id, agent_id=agent_id, **req):
-                if isinstance(answer, str):
-                    try:
-                        ans = json.loads(answer[5:])  # remove "data:"
-                    except Exception:
-                        continue
-
-                if ans.get("event") != "message":
-                    continue
-
-                yield answer
-
-            yield "data:[DONE]\n\n"
-
-        resp = Response(generate(), mimetype="text/event-stream")
         resp.headers.add_header("Cache-control", "no-cache")
         resp.headers.add_header("Connection", "keep-alive")
         resp.headers.add_header("X-Accel-Buffering", "no")
         resp.headers.add_header("Content-Type", "text/event-stream; charset=utf-8")
         return resp
-
+    result = {}
     for answer in agent_completion(tenant_id=tenant_id, agent_id=agent_id, **req):
         try:
             ans = json.loads(answer[5:])  # remove "data:"
+            if not result:
+                result = ans.copy()
+            else:
+                result["data"]["answer"] += ans["data"]["answer"]
+                result["data"]["reference"] = ans["data"].get("reference", [])
         except Exception as e:
-            return get_result(data=f"**ERROR**: {str(e)}")
+            return get_error_data_result(str(e))
-    return get_result(data=ans)
+    return result
 
 
 @manager.route("/chats/<chat_id>/sessions", methods=["GET"])  # noqa: F821

api/db/services/canvas_service.py

@@ -134,6 +134,25 @@ class UserCanvasService(CommonService):
             return False
         return True
 
+
+def structure_answer(conv, ans, message_id, session_id):
+    if not conv:
+        return ans
+    content = ""
+    if ans["event"] == "message":
+        if ans["data"].get("start_to_think") is True:
+            content = "<think>"
+        elif ans["data"].get("end_to_think") is True:
+            content = "</think>"
+        else:
+            content = ans["data"]["content"]
+
+    reference = ans["data"].get("reference")
+    result = {"id": message_id, "session_id": session_id, "answer": content}
+    if reference:
+        result["reference"] = [reference]
+    return result
+
 def completion(tenant_id, agent_id, session_id=None, **kwargs):
     query = kwargs.get("query", "") or kwargs.get("question", "")
     files = kwargs.get("files", [])
@@ -176,13 +195,14 @@ def completion(tenant_id, agent_id, session_id=None, **kwargs):
     })
     txt = ""
     for ans in canvas.run(query=query, files=files, user_id=user_id, inputs=inputs):
-        ans["session_id"] = session_id
+        ans = structure_answer(conv, ans, message_id, session_id)
-        if ans["event"] == "message":
+        txt += ans["answer"]
-            txt += ans["data"]["content"]
+        if ans.get("answer") or ans.get("reference"):
-        yield "data:" + json.dumps(ans, ensure_ascii=False) + "\n\n"
+            yield "data:" + json.dumps({"code": 0, "data": ans},
+                                       ensure_ascii=False) + "\n\n"
 
     conv.message.append({"role": "assistant", "content": txt, "created_at": time.time(), "id": message_id})
-    conv.reference = canvas.get_reference()
+    conv.reference.append(canvas.get_reference())
     conv.errors = canvas.error
     conv.dsl = str(canvas)
     conv = conv.to_dict()
@@ -211,11 +231,9 @@ def completionOpenAI(tenant_id, agent_id, question, session_id=None, stream=True
                     except Exception as e:
                         logging.exception(f"Agent OpenAI-Compatible completionOpenAI parse answer failed: {e}")
                         continue
-
+                if not ans["data"]["answer"]:
-                if ans.get("event") != "message":
                     continue
-
+                content_piece = ans["data"]["answer"]
-                content_piece = ans["data"]["content"]
                 completion_tokens += len(tiktokenenc.encode(content_piece))
 
                 yield "data: " + json.dumps(
@@ -260,9 +278,9 @@ def completionOpenAI(tenant_id, agent_id, question, session_id=None, stream=True
             ):
                 if isinstance(ans, str):
                     ans = json.loads(ans[5:])
-                if ans.get("event") != "message":
+                if not ans["data"]["answer"]:
                     continue
-                all_content += ans["data"]["content"]
+                all_content += ans["data"]["answer"]
 
             completion_tokens = len(tiktokenenc.encode(all_content))