fix: Only add demo and a tool class to complete the function

metagpt/utils/stream_pipe.py

@@ -0,0 +1,57 @@
+# -*- coding: utf-8 -*-
+# @Time    : 2024/3/27 10:00
+# @Author  : leiwu30
+# @File    : stream_pipe.py
+# @Version : None
+# @Description : None
+
+import time
+import json
+from multiprocessing import Pipe
+
+
+class StreamPipe:
+    parent_conn, child_conn = Pipe()
+
+    variable: list = {}
+    finish: bool = False
+
+    format_data = {
+        "id": "chatcmpl-96bVnBOOyPFZZxEoTIGbdpFcVEnur",
+        "object": "chat.completion.chunk",
+        "created": 1711361191,
+        "model": "gpt-3.5-turbo-0125",
+        "system_fingerprint": "fp_3bc1b5746c",
+        "choices": [
+            {
+                "index": 0,
+                "delta":
+                    {
+                        "role": "assistant",
+                        "content": "content"
+                    },
+                "logprobs": None,
+                "finish_reason": None
+            }
+        ]
+    }
+
+    def set_message(self, msg):
+        self.parent_conn.send(msg)
+
+    def get_message(self, timeout: int = 3):
+        if self.child_conn.poll(timeout):
+            return self.child_conn.recv()
+        else:
+            return None
+
+    def set_k_message(self, k, msg):
+        self.variable[k] = msg
+
+    def get_k_message(self, k):
+        return self.variable[k]
+
+    def msg2stream(self, msg):
+        self.format_data['created'] = int(time.time())
+        self.format_data['choices'][0]['delta']['content'] = msg
+        return f"data: {json.dumps(self.format_data, ensure_ascii=False)}\n".encode("utf-8")