mirror of
https://github.com/xinnan-tech/xiaozhi-esp32-server.git
synced 2026-07-22 23:23:55 +08:00
126 lines
4.2 KiB
Python
126 lines
4.2 KiB
Python
from __future__ import annotations
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from datetime import timedelta
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import asyncio, os, shutil, concurrent.futures
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from contextlib import AsyncExitStack
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from typing import Optional, List, Dict, Any
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from mcp import ClientSession, StdioServerParameters
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from mcp.client.stdio import stdio_client
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from mcp.client.sse import sse_client
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from config.logger import setup_logging
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TAG = __name__
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class MCPClient:
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def __init__(self, config: Dict[str, Any]):
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self.logger = setup_logging()
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self.config = config
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self._worker_task: Optional[asyncio.Task] = None
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self._ready_evt = asyncio.Event()
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self._shutdown_evt = asyncio.Event()
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self.session: Optional[ClientSession] = None
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self.tools: List = []
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async def initialize(self):
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if self._worker_task:
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return
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self._worker_task = asyncio.create_task(self._worker(), name="MCPClientWorker")
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await self._ready_evt.wait()
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self.logger.bind(tag=TAG).info(
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f"Connected, tools = {[t.name for t in self.tools]}"
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)
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async def cleanup(self):
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if not self._worker_task:
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return
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self._shutdown_evt.set()
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try:
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await asyncio.wait_for(self._worker_task, timeout=20)
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except (asyncio.TimeoutError, Exception) as e:
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self.logger.bind(tag=TAG).error(f"worker shutdown err: {e}")
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finally:
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self._worker_task = None
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def has_tool(self, name: str) -> bool:
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return any(t.name == name for t in self.tools)
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def get_available_tools(self):
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return [
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{
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"type": "function",
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"function": {
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"name": t.name,
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"description": t.description,
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"parameters": t.inputSchema,
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},
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}
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for t in self.tools
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]
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async def call_tool(self, name: str, args: dict):
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if not self.session:
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raise RuntimeError("MCPClient not initialized")
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loop = self._worker_task.get_loop()
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coro = self.session.call_tool(name, args)
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if loop is asyncio.get_running_loop():
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return await coro
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fut: concurrent.futures.Future = asyncio.run_coroutine_threadsafe(coro, loop)
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return await asyncio.wrap_future(fut)
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async def _worker(self):
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async with AsyncExitStack() as stack:
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try:
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# 建立 StdioClient
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if "command" in self.config:
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cmd = (
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shutil.which("npx")
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if self.config["command"] == "npx"
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else self.config["command"]
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)
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env = {**os.environ, **self.config.get("env", {})}
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params = StdioServerParameters(
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command=cmd,
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args=self.config.get("args", []),
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env=env,
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)
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stdio_r, stdio_w = await stack.enter_async_context(stdio_client(params))
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read_stream, write_stream = stdio_r, stdio_w
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# 建立SSEClient
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elif "url" in self.config:
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sse_r, sse_w = await stack.enter_async_context(sse_client(self.config["url"]))
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read_stream, write_stream = sse_r, sse_w
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else:
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raise ValueError("MCPClient config must include 'command' or 'url'")
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self.session = await stack.enter_async_context(
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ClientSession(
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read_stream=read_stream,
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write_stream=write_stream,
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read_timeout_seconds=timedelta(seconds=15),
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)
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)
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await self.session.initialize()
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# 获取工具
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self.tools = (await self.session.list_tools()).tools
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self._ready_evt.set()
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# 挂起等待关闭
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await self._shutdown_evt.wait()
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except Exception as e:
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self.logger.bind(tag=TAG).error(f"worker error: {e}")
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self._ready_evt.set()
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raise
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