deer-flow/backend/src/mcp/client.py

"""MCP client using langchain-mcp-adapters."""

import logging
from typing import Any

from src.config.extensions_config import ExtensionsConfig, McpServerConfig

logger = logging.getLogger(__name__)


def build_server_params(server_name: str, config: McpServerConfig) -> dict[str, Any]:
    """Build server parameters for MultiServerMCPClient.

    Args:
        server_name: Name of the MCP server.
        config: Configuration for the MCP server.

    Returns:
        Dictionary of server parameters for langchain-mcp-adapters.
    """
    params: dict[str, Any] = {
        "command": config.command,
        "args": config.args,
        "transport": "stdio",  # Default to stdio transport
    }

    # Add environment variables if present
    if config.env:
        params["env"] = config.env

    return params


def build_servers_config(extensions_config: ExtensionsConfig) -> dict[str, dict[str, Any]]:
    """Build servers configuration for MultiServerMCPClient.

    Args:
        extensions_config: Extensions configuration containing all MCP servers.

    Returns:
        Dictionary mapping server names to their parameters.
    """
    enabled_servers = extensions_config.get_enabled_mcp_servers()

    if not enabled_servers:
        logger.info("No enabled MCP servers found")
        return {}

    servers_config = {}
    for server_name, server_config in enabled_servers.items():
        try:
            servers_config[server_name] = build_server_params(server_name, server_config)
            logger.info(f"Configured MCP server: {server_name}")
        except Exception as e:
            logger.error(f"Failed to configure MCP server '{server_name}': {e}")

    return servers_config