17d62a9af7
* refactor: mcp server reload mechanism * fix: wait for client events * fix: all other mcp servers are terminated when disable selected server * fix: resolve type hinting issues in MCPClient and FuncCall methods * perf: optimize mcp server loaders * perf: improve MCP client connection testing * perf: improve error message * perf: clean code * perf: increase default timeout for MCP connection and reset dialog message on close --------- Co-authored-by: Raven95676 <Raven95676@gmail.com>
759 lines
27 KiB
Python
759 lines
27 KiB
Python
from __future__ import annotations
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import json
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import textwrap
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import os
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import asyncio
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import logging
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from datetime import timedelta
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from typing import Dict, List, Awaitable, Literal, Any
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from dataclasses import dataclass
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from typing import Optional
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from contextlib import AsyncExitStack
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from astrbot import logger
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from astrbot.core.utils.log_pipe import LogPipe
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from astrbot.core.utils.astrbot_path import get_astrbot_data_path
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try:
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import mcp
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from mcp.client.sse import sse_client
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except (ModuleNotFoundError, ImportError):
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logger.warning("警告: 缺少依赖库 'mcp'，将无法使用 MCP 服务。")
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try:
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from mcp.client.streamable_http import streamablehttp_client
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except (ModuleNotFoundError, ImportError):
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logger.warning(
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"警告: 缺少依赖库 'mcp' 或者 mcp 库版本过低，无法使用 Streamable HTTP 连接方式。"
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)
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DEFAULT_MCP_CONFIG = {"mcpServers": {}}
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SUPPORTED_TYPES = [
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"string",
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"number",
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"object",
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"array",
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"boolean",
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] # json schema 支持的数据类型
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def _prepare_config(config: dict) -> dict:
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"""准备配置，处理嵌套格式"""
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if "mcpServers" in config and config["mcpServers"]:
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first_key = next(iter(config["mcpServers"]))
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config = config["mcpServers"][first_key]
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config.pop("active", None)
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return config
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async def _quick_test_mcp_connection(config: dict) -> tuple[bool, str]:
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"""快速测试 MCP 服务器可达性"""
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import aiohttp
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cfg = _prepare_config(config.copy())
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url = cfg["url"]
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headers = cfg.get("headers", {})
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timeout = cfg.get("timeout", 10)
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try:
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async with aiohttp.ClientSession() as session:
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if cfg.get("transport") == "streamable_http":
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test_payload = {
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"jsonrpc": "2.0",
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"method": "initialize",
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"id": 0,
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"params": {
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"protocolVersion": "2024-11-05",
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"capabilities": {},
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"clientInfo": {"name": "test-client", "version": "1.2.3"},
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},
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}
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async with session.post(
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url,
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headers={
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**headers,
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"Content-Type": "application/json",
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"Accept": "application/json, text/event-stream",
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},
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json=test_payload,
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timeout=aiohttp.ClientTimeout(total=timeout),
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) as response:
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if response.status == 200:
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return True, ""
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else:
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return False, f"HTTP {response.status}: {response.reason}"
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else:
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async with session.get(
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url,
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headers={
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**headers,
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"Accept": "application/json, text/event-stream",
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},
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timeout=aiohttp.ClientTimeout(total=timeout),
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) as response:
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if response.status == 200:
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return True, ""
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else:
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return False, f"HTTP {response.status}: {response.reason}"
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except asyncio.TimeoutError:
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return False, f"连接超时: {timeout}秒"
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except Exception as e:
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return False, f"{e!s}"
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@dataclass
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class FuncTool:
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"""
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用于描述一个函数调用工具。
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"""
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name: str
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parameters: Dict
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description: str
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handler: Awaitable = None
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"""处理函数, 当 origin 为 mcp 时，这个为空"""
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handler_module_path: str = None
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"""处理函数的模块路径，当 origin 为 mcp 时，这个为空
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必须要保留这个字段, handler 在初始化会被 functools.partial 包装，导致 handler 的 __module__ 为 functools
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"""
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active: bool = True
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"""是否激活"""
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origin: Literal["local", "mcp"] = "local"
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"""函数工具的来源, local 为本地函数工具, mcp 为 MCP 服务"""
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# MCP 相关字段
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mcp_server_name: str = None
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"""MCP 服务名称，当 origin 为 mcp 时有效"""
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mcp_client: MCPClient = None
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"""MCP 客户端，当 origin 为 mcp 时有效"""
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def __repr__(self):
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return f"FuncTool(name={self.name}, parameters={self.parameters}, description={self.description}, active={self.active}, origin={self.origin})"
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async def execute(self, **args) -> Any:
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"""执行函数调用"""
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if self.origin == "local":
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if not self.handler:
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raise Exception(f"Local function {self.name} has no handler")
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return await self.handler(**args)
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elif self.origin == "mcp":
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if not self.mcp_client or not self.mcp_client.session:
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raise Exception(f"MCP client for {self.name} is not available")
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# 使用name属性而不是额外的mcp_tool_name
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actual_tool_name = (
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self.name.split(":")[-1] if ":" in self.name else self.name
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)
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return await self.mcp_client.session.call_tool(actual_tool_name, args)
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else:
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raise Exception(f"Unknown function origin: {self.origin}")
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class MCPClient:
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def __init__(self):
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# Initialize session and client objects
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self.session: Optional[mcp.ClientSession] = None
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self.exit_stack = AsyncExitStack()
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self.name = None
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self.active: bool = True
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self.tools: List[mcp.Tool] = []
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self.server_errlogs: List[str] = []
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self.running_event = asyncio.Event()
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async def connect_to_server(self, mcp_server_config: dict, name: str):
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"""连接到 MCP 服务器
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如果 `url` 参数存在：
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1. 当 transport 指定为 `streamable_http` 时，使用 Streamable HTTP 连接方式。
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1. 当 transport 指定为 `sse` 时，使用 SSE 连接方式。
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2. 如果没有指定，默认使用 SSE 的方式连接到 MCP 服务。
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Args:
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mcp_server_config (dict): Configuration for the MCP server. See https://modelcontextprotocol.io/quickstart/server
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"""
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cfg = _prepare_config(mcp_server_config.copy())
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def logging_callback(msg: str):
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# 处理 MCP 服务的错误日志
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print(f"MCP Server {name} Error: {msg}")
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self.server_errlogs.append(msg)
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if "url" in cfg:
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success, error_msg = await _quick_test_mcp_connection(cfg)
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if not success:
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raise Exception(error_msg)
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if cfg.get("transport") != "streamable_http":
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# SSE transport method
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self._streams_context = sse_client(
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url=cfg["url"],
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headers=cfg.get("headers", {}),
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timeout=cfg.get("timeout", 5),
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sse_read_timeout=cfg.get("sse_read_timeout", 60 * 5),
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)
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streams = await self.exit_stack.enter_async_context(
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self._streams_context
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)
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# Create a new client session
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read_timeout = timedelta(seconds=cfg.get("session_read_timeout", 20))
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self.session = await self.exit_stack.enter_async_context(
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mcp.ClientSession(
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*streams,
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read_timeout_seconds=read_timeout,
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logging_callback=logging_callback, # type: ignore
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)
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)
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else:
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timeout = timedelta(seconds=cfg.get("timeout", 30))
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sse_read_timeout = timedelta(
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seconds=cfg.get("sse_read_timeout", 60 * 5)
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)
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self._streams_context = streamablehttp_client(
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url=cfg["url"],
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headers=cfg.get("headers", {}),
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timeout=timeout,
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sse_read_timeout=sse_read_timeout,
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terminate_on_close=cfg.get("terminate_on_close", True),
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)
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read_s, write_s, _ = await self.exit_stack.enter_async_context(
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self._streams_context
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)
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# Create a new client session
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read_timeout = timedelta(seconds=cfg.get("session_read_timeout", 20))
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self.session = await self.exit_stack.enter_async_context(
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mcp.ClientSession(
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read_stream=read_s,
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write_stream=write_s,
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read_timeout_seconds=read_timeout,
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logging_callback=logging_callback, # type: ignore
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)
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)
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else:
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server_params = mcp.StdioServerParameters(
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**cfg,
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)
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def callback(msg: str):
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# 处理 MCP 服务的错误日志
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self.server_errlogs.append(msg)
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stdio_transport = await self.exit_stack.enter_async_context(
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mcp.stdio_client(
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server_params,
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errlog=LogPipe(
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level=logging.ERROR,
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logger=logger,
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identifier=f"MCPServer-{name}",
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callback=callback,
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), # type: ignore
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),
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)
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# Create a new client session
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self.session = await self.exit_stack.enter_async_context(
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mcp.ClientSession(*stdio_transport)
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)
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await self.session.initialize()
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async def list_tools_and_save(self) -> mcp.ListToolsResult:
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"""List all tools from the server and save them to self.tools"""
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response = await self.session.list_tools()
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self.tools = response.tools
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return response
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async def cleanup(self):
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"""Clean up resources"""
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await self.exit_stack.aclose()
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self.running_event.set() # Set the running event to indicate cleanup is done
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class FuncCall:
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def __init__(self) -> None:
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self.func_list: List[FuncTool] = []
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"""内部加载的 func tools"""
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self.mcp_client_dict: Dict[str, MCPClient] = {}
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"""MCP 服务列表"""
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self.mcp_client_event: Dict[str, asyncio.Event] = {}
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def empty(self) -> bool:
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return len(self.func_list) == 0
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def add_func(
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self,
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name: str,
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func_args: list,
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desc: str,
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handler: Awaitable,
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) -> None:
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"""添加函数调用工具
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@param name: 函数名
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@param func_args: 函数参数列表，格式为 [{"type": "string", "name": "arg_name", "description": "arg_description"}, ...]
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@param desc: 函数描述
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@param func_obj: 处理函数
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"""
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# check if the tool has been added before
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self.remove_func(name)
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params = {
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"type": "object", # hard-coded here
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"properties": {},
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}
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for param in func_args:
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params["properties"][param["name"]] = {
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"type": param["type"],
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"description": param["description"],
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}
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_func = FuncTool(
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name=name,
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parameters=params,
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description=desc,
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handler=handler,
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)
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self.func_list.append(_func)
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logger.info(f"添加函数调用工具: {name}")
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def remove_func(self, name: str) -> None:
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"""
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删除一个函数调用工具。
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"""
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for i, f in enumerate(self.func_list):
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if f.name == name:
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self.func_list.pop(i)
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break
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def get_func(self, name) -> FuncTool:
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for f in self.func_list:
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if f.name == name:
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return f
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return None
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async def init_mcp_clients(self) -> None:
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"""从项目根目录读取 mcp_server.json 文件，初始化 MCP 服务列表。文件格式如下：
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```
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{
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"mcpServers": {
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"weather": {
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"command": "uv",
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"args": [
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"--directory",
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"/ABSOLUTE/PATH/TO/PARENT/FOLDER/weather",
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"run",
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"weather.py"
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]
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}
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}
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...
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}
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```
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"""
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data_dir = get_astrbot_data_path()
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mcp_json_file = os.path.join(data_dir, "mcp_server.json")
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if not os.path.exists(mcp_json_file):
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# 配置文件不存在错误处理
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with open(mcp_json_file, "w", encoding="utf-8") as f:
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json.dump(DEFAULT_MCP_CONFIG, f, ensure_ascii=False, indent=4)
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logger.info(f"未找到 MCP 服务配置文件，已创建默认配置文件 {mcp_json_file}")
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return
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mcp_server_json_obj: Dict[str, Dict] = json.load(
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open(mcp_json_file, "r", encoding="utf-8")
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)["mcpServers"]
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for name in mcp_server_json_obj.keys():
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cfg = mcp_server_json_obj[name]
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if cfg.get("active", True):
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event = asyncio.Event()
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asyncio.create_task(
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self._init_mcp_client_task_wrapper(name, cfg, event)
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)
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self.mcp_client_event[name] = event
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async def _init_mcp_client_task_wrapper(
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self,
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name: str,
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cfg: dict,
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event: asyncio.Event,
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ready_future: asyncio.Future = None,
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) -> None:
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"""初始化 MCP 客户端的包装函数，用于捕获异常"""
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try:
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await self._init_mcp_client(name, cfg)
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tools = await self.mcp_client_dict[name].list_tools_and_save()
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if ready_future and not ready_future.done():
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# tell the caller we are ready
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ready_future.set_result(tools)
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await event.wait()
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logger.info(f"收到 MCP 客户端 {name} 终止信号")
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except Exception as e:
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logger.error(f"初始化 MCP 客户端 {name} 失败", exc_info=True)
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if ready_future and not ready_future.done():
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ready_future.set_exception(e)
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finally:
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# 无论如何都能清理
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await self._terminate_mcp_client(name)
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async def _init_mcp_client(self, name: str, config: dict) -> None:
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"""初始化单个MCP客户端"""
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# 先清理之前的客户端，如果存在
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if name in self.mcp_client_dict:
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await self._terminate_mcp_client(name)
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mcp_client = MCPClient()
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mcp_client.name = name
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self.mcp_client_dict[name] = mcp_client
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await mcp_client.connect_to_server(config, name)
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tools_res = await mcp_client.list_tools_and_save()
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logger.debug(f"MCP server {name} list tools response: {tools_res}")
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tool_names = [tool.name for tool in tools_res.tools]
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# 移除该MCP服务之前的工具（如有）
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self.func_list = [
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f
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for f in self.func_list
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if not (f.origin == "mcp" and f.mcp_server_name == name)
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]
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# 将 MCP 工具转换为 FuncTool 并添加到 func_list
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for tool in mcp_client.tools:
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func_tool = FuncTool(
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name=tool.name,
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parameters=tool.inputSchema,
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description=tool.description,
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origin="mcp",
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mcp_server_name=name,
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mcp_client=mcp_client,
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)
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self.func_list.append(func_tool)
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logger.info(f"已连接 MCP 服务 {name}, Tools: {tool_names}")
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|
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async def _terminate_mcp_client(self, name: str) -> None:
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"""关闭并清理MCP客户端"""
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if name in self.mcp_client_dict:
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try:
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# 关闭MCP连接
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await self.mcp_client_dict[name].cleanup()
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self.mcp_client_dict.pop(name)
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except Exception as e:
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logger.error(f"清空 MCP 客户端资源 {name}: {e}。")
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# 移除关联的FuncTool
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self.func_list = [
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f
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for f in self.func_list
|
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if not (f.origin == "mcp" and f.mcp_server_name == name)
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]
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logger.info(f"已关闭 MCP 服务 {name}")
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|
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@staticmethod
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async def test_mcp_server_connection(config: dict) -> list[str]:
|
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if "url" in config:
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success, error_msg = await _quick_test_mcp_connection(config)
|
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if not success:
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raise Exception(error_msg)
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mcp_client = MCPClient()
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try:
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logger.debug(f"testing MCP server connection with config: {config}")
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await mcp_client.connect_to_server(config, "test")
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tools_res = await mcp_client.list_tools_and_save()
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tool_names = [tool.name for tool in tools_res.tools]
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finally:
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logger.debug("Cleaning up MCP client after testing connection.")
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await mcp_client.cleanup()
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return tool_names
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|
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async def enable_mcp_server(
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self,
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name: str,
|
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config: dict,
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event: asyncio.Event | None = None,
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ready_future: asyncio.Future | None = None,
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timeout: int = 30,
|
||
) -> None:
|
||
"""Enable_mcp_server a new MCP server to the manager and initialize it.
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|
||
Args:
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name (str): The name of the MCP server.
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config (dict): Configuration for the MCP server.
|
||
event (asyncio.Event): Event to signal when the MCP client is ready.
|
||
ready_future (asyncio.Future): Future to signal when the MCP client is ready.
|
||
timeout (int): Timeout for the initialization.
|
||
Raises:
|
||
TimeoutError: If the initialization does not complete within the specified timeout.
|
||
Exception: If there is an error during initialization.
|
||
"""
|
||
if not event:
|
||
event = asyncio.Event()
|
||
if not ready_future:
|
||
ready_future = asyncio.Future()
|
||
if name in self.mcp_client_dict:
|
||
return
|
||
asyncio.create_task(
|
||
self._init_mcp_client_task_wrapper(name, config, event, ready_future)
|
||
)
|
||
try:
|
||
await asyncio.wait_for(ready_future, timeout=timeout)
|
||
finally:
|
||
self.mcp_client_event[name] = event
|
||
|
||
if ready_future.done() and ready_future.exception():
|
||
exc = ready_future.exception()
|
||
if exc is not None:
|
||
raise exc
|
||
|
||
async def disable_mcp_server(
|
||
self, name: str | None = None, timeout: float = 10
|
||
) -> None:
|
||
"""Disable an MCP server by its name.
|
||
|
||
Args:
|
||
name (str): The name of the MCP server to disable. If None, ALL MCP servers will be disabled.
|
||
timeout (int): Timeout.
|
||
"""
|
||
if name:
|
||
if name not in self.mcp_client_event:
|
||
return
|
||
client = self.mcp_client_dict.get(name)
|
||
self.mcp_client_event[name].set()
|
||
if not client:
|
||
return
|
||
client_running_event = client.running_event
|
||
try:
|
||
await asyncio.wait_for(client_running_event.wait(), timeout=timeout)
|
||
finally:
|
||
self.mcp_client_event.pop(name, None)
|
||
self.func_list = [
|
||
f
|
||
for f in self.func_list
|
||
if f.origin != "mcp" or f.mcp_server_name != name
|
||
]
|
||
else:
|
||
running_events = [
|
||
client.running_event.wait() for client in self.mcp_client_dict.values()
|
||
]
|
||
for key, event in self.mcp_client_event.items():
|
||
event.set()
|
||
# waiting for all clients to finish
|
||
try:
|
||
await asyncio.wait_for(asyncio.gather(*running_events), timeout=timeout)
|
||
finally:
|
||
self.mcp_client_event.clear()
|
||
self.mcp_client_dict.clear()
|
||
self.func_list = [f for f in self.func_list if f.origin != "mcp"]
|
||
|
||
def get_func_desc_openai_style(self, omit_empty_parameter_field=False) -> list:
|
||
"""
|
||
获得 OpenAI API 风格的**已经激活**的工具描述
|
||
"""
|
||
_l = []
|
||
# 处理所有工具（包括本地和MCP工具）
|
||
for f in self.func_list:
|
||
if not f.active:
|
||
continue
|
||
func_ = {
|
||
"type": "function",
|
||
"function": {
|
||
"name": f.name,
|
||
# "parameters": f.parameters,
|
||
"description": f.description,
|
||
},
|
||
}
|
||
func_["function"]["parameters"] = f.parameters
|
||
if not f.parameters.get("properties") and omit_empty_parameter_field:
|
||
# 如果 properties 为空，并且 omit_empty_parameter_field 为 True，则删除 parameters 字段
|
||
del func_["function"]["parameters"]
|
||
_l.append(func_)
|
||
return _l
|
||
|
||
def get_func_desc_anthropic_style(self) -> list:
|
||
"""
|
||
获得 Anthropic API 风格的**已经激活**的工具描述
|
||
"""
|
||
tools = []
|
||
for f in self.func_list:
|
||
if not f.active:
|
||
continue
|
||
|
||
# Convert internal format to Anthropic style
|
||
tool = {
|
||
"name": f.name,
|
||
"description": f.description,
|
||
"input_schema": {
|
||
"type": "object",
|
||
"properties": f.parameters.get("properties", {}),
|
||
# Keep the required field from the original parameters if it exists
|
||
"required": f.parameters.get("required", []),
|
||
},
|
||
}
|
||
tools.append(tool)
|
||
return tools
|
||
|
||
def get_func_desc_google_genai_style(self) -> dict:
|
||
"""
|
||
获得 Google GenAI API 风格的**已经激活**的工具描述
|
||
"""
|
||
|
||
# Gemini API 支持的数据类型和格式
|
||
supported_types = {
|
||
"string",
|
||
"number",
|
||
"integer",
|
||
"boolean",
|
||
"array",
|
||
"object",
|
||
"null",
|
||
}
|
||
supported_formats = {
|
||
"string": {"enum", "date-time"},
|
||
"integer": {"int32", "int64"},
|
||
"number": {"float", "double"},
|
||
}
|
||
|
||
def convert_schema(schema: dict) -> dict:
|
||
"""转换 schema 为 Gemini API 格式"""
|
||
|
||
# 如果 schema 包含 anyOf，则只返回 anyOf 字段
|
||
if "anyOf" in schema:
|
||
return {"anyOf": [convert_schema(s) for s in schema["anyOf"]]}
|
||
|
||
result = {}
|
||
|
||
if "type" in schema and schema["type"] in supported_types:
|
||
result["type"] = schema["type"]
|
||
if "format" in schema and schema["format"] in supported_formats.get(
|
||
result["type"], set()
|
||
):
|
||
result["format"] = schema["format"]
|
||
else:
|
||
# 暂时指定默认为null
|
||
result["type"] = "null"
|
||
|
||
support_fields = {
|
||
"title",
|
||
"description",
|
||
"enum",
|
||
"minimum",
|
||
"maximum",
|
||
"maxItems",
|
||
"minItems",
|
||
"nullable",
|
||
"required",
|
||
}
|
||
result.update({k: schema[k] for k in support_fields if k in schema})
|
||
|
||
if "properties" in schema:
|
||
properties = {}
|
||
for key, value in schema["properties"].items():
|
||
prop_value = convert_schema(value)
|
||
if "default" in prop_value:
|
||
del prop_value["default"]
|
||
properties[key] = prop_value
|
||
|
||
if properties: # 只在有非空属性时添加
|
||
result["properties"] = properties
|
||
|
||
if "items" in schema:
|
||
result["items"] = convert_schema(schema["items"])
|
||
|
||
return result
|
||
|
||
tools = [
|
||
{
|
||
"name": f.name,
|
||
"description": f.description,
|
||
**({"parameters": convert_schema(f.parameters)}),
|
||
}
|
||
for f in self.func_list
|
||
if f.active
|
||
]
|
||
|
||
declarations = {}
|
||
if tools:
|
||
declarations["function_declarations"] = tools
|
||
return declarations
|
||
|
||
async def func_call(self, question: str, session_id: str, provider) -> tuple:
|
||
_l = []
|
||
for f in self.func_list:
|
||
if not f.active:
|
||
continue
|
||
_l.append(
|
||
{
|
||
"name": f.name,
|
||
"parameters": f.parameters,
|
||
"description": f.description,
|
||
}
|
||
)
|
||
func_definition = json.dumps(_l, ensure_ascii=False)
|
||
|
||
prompt = textwrap.dedent(f"""
|
||
ROLE:
|
||
你是一个 Function calling AI Agent, 你的任务是将用户的提问转化为函数调用。
|
||
|
||
TOOLS:
|
||
可用的函数列表:
|
||
|
||
{func_definition}
|
||
|
||
LIMIT:
|
||
1. 你返回的内容应当能够被 Python 的 json 模块解析的 Json 格式字符串。
|
||
2. 你的 Json 返回的格式如下：`[{{"name": "<func_name>", "args": <arg_dict>}}, ...]`。参数根据上面提供的函数列表中的参数来填写。
|
||
3. 允许必要时返回多个函数调用，但需保证这些函数调用的顺序正确。
|
||
4. 如果用户的提问中不需要用到给定的函数，请直接返回 `{{"res": False}}`。
|
||
|
||
EXAMPLE:
|
||
1. `用户提问`：请问一下天气怎么样？ `函数调用`：[{{"name": "get_weather", "args": {{"city": "北京"}}}}]
|
||
|
||
用户的提问是：{question}
|
||
""")
|
||
|
||
_c = 0
|
||
while _c < 3:
|
||
try:
|
||
res = await provider.text_chat(prompt, session_id)
|
||
if res.find("```") != -1:
|
||
res = res[res.find("```json") + 7 : res.rfind("```")]
|
||
res = json.loads(res)
|
||
break
|
||
except Exception as e:
|
||
_c += 1
|
||
if _c == 3:
|
||
raise e
|
||
if "The message you submitted was too long" in str(e):
|
||
raise e
|
||
|
||
if "res" in res and not res["res"]:
|
||
return "", False
|
||
|
||
tool_call_result = []
|
||
for tool in res:
|
||
# 说明有函数调用
|
||
func_name = tool["name"]
|
||
args = tool["args"]
|
||
# 调用函数
|
||
func_tool = self.get_func(func_name)
|
||
if not func_tool:
|
||
raise Exception(f"Request function {func_name} not found.")
|
||
|
||
ret = await func_tool.execute(**args)
|
||
if ret:
|
||
tool_call_result.append(str(ret))
|
||
return tool_call_result, True
|
||
|
||
def __str__(self):
|
||
return str(self.func_list)
|
||
|
||
def __repr__(self):
|
||
return str(self.func_list)
|