mirror of
https://gitee.com/wanwujie/deer-flow
synced 2026-04-08 16:24:45 +08:00
a2f91c7594
add oauth schema to MCP server config (extensions_config.json) support client_credentials and refresh_token grants implement token manager with caching and pre-expiry refresh inject OAuth Authorization header for MCP tool discovery and tool calls extend MCP gateway config models to read/write OAuth settings update docs and examples for OAuth configuration add unit tests for token fetch/cache and header injection
67 lines
2.6 KiB
Python
67 lines
2.6 KiB
Python
"""Load MCP tools using langchain-mcp-adapters."""
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import logging
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from langchain_core.tools import BaseTool
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from src.config.extensions_config import ExtensionsConfig
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from src.mcp.client import build_servers_config
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from src.mcp.oauth import build_oauth_tool_interceptor, get_initial_oauth_headers
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logger = logging.getLogger(__name__)
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async def get_mcp_tools() -> list[BaseTool]:
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"""Get all tools from enabled MCP servers.
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Returns:
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List of LangChain tools from all enabled MCP servers.
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"""
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try:
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from langchain_mcp_adapters.client import MultiServerMCPClient
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except ImportError:
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logger.warning("langchain-mcp-adapters not installed. Install it to enable MCP tools: pip install langchain-mcp-adapters")
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return []
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# NOTE: We use ExtensionsConfig.from_file() instead of get_extensions_config()
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# to always read the latest configuration from disk. This ensures that changes
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# made through the Gateway API (which runs in a separate process) are immediately
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# reflected when initializing MCP tools.
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extensions_config = ExtensionsConfig.from_file()
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servers_config = build_servers_config(extensions_config)
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if not servers_config:
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logger.info("No enabled MCP servers configured")
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return []
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try:
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# Create the multi-server MCP client
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logger.info(f"Initializing MCP client with {len(servers_config)} server(s)")
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# Inject initial OAuth headers for server connections (tool discovery/session init)
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initial_oauth_headers = await get_initial_oauth_headers(extensions_config)
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for server_name, auth_header in initial_oauth_headers.items():
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if server_name not in servers_config:
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continue
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if servers_config[server_name].get("transport") in ("sse", "http"):
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existing_headers = dict(servers_config[server_name].get("headers", {}))
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existing_headers["Authorization"] = auth_header
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servers_config[server_name]["headers"] = existing_headers
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tool_interceptors = []
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oauth_interceptor = build_oauth_tool_interceptor(extensions_config)
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if oauth_interceptor is not None:
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tool_interceptors.append(oauth_interceptor)
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client = MultiServerMCPClient(servers_config, tool_interceptors=tool_interceptors)
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# Get all tools from all servers
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tools = await client.get_tools()
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logger.info(f"Successfully loaded {len(tools)} tool(s) from MCP servers")
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return tools
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except Exception as e:
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logger.error(f"Failed to load MCP tools: {e}", exc_info=True)
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return []
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