mcp/app.py

import argparse
import json
import sys
import uuid

from config import GatewayConfig
from mcp_protocol import McpProtocolHandler
from services.api_client import ApiClient
from services.auth_client import AuthClient
from services.token_store import FileTokenStore, RedisSocketClient, RedisTokenStore
from tools.bind_auth_code import BindAuthCodeTool
from tools.query_order import QueryOrderTool


BIND_HINT = '请先登录后台获取 Workbuddy 授权码，然后在 Workbuddy 中输入“绑定授权码 xxx”完成绑定。'


class GatewayApp:
    def __init__(self, auth_client=None, api_client=None, token_store=None):
        self.auth_client = auth_client
        self.api_client = api_client
        self.token_store = token_store
        self._tools = {
            'bind_auth_code': BindAuthCodeTool(auth_client=auth_client),
            'query_order': QueryOrderTool(api_client=api_client),
        }

    @classmethod
    def from_config(cls, config, redis_client=None):
        if config.token_store_type == 'redis':
            redis = redis_client or RedisSocketClient(
                host=config.redis_host,
                port=config.redis_port,
                db=config.redis_db,
                password=config.redis_password,
                timeout=config.timeout_seconds,
            )
            token_store = RedisTokenStore(
                redis,
                prefix=config.redis_prefix,
                session_key=config.session_key,
                refresh_skew_seconds=config.refresh_skew_seconds,
            )
        elif config.token_store_type == 'file':
            token_store = FileTokenStore(
                config.token_store_path,
                refresh_skew_seconds=config.refresh_skew_seconds,
            )
        else:
            raise ValueError('unsupported token store type: {0}'.format(config.token_store_type))

        auth_client = AuthClient(
            base_url=config.auth_base_url,
            client_type=config.client_type,
            token_store=token_store,
            timeout=config.timeout_seconds,
            session_key=config.session_key,
        )
        api_client = ApiClient(
            base_url=config.tools_base_url,
            token_store=token_store,
            timeout=config.timeout_seconds,
        )
        return cls(auth_client=auth_client, api_client=api_client, token_store=token_store)

    def list_tools(self):
        return [tool.metadata() for tool in self._tools.values()]

    def bind(self, auth_code):
        if self.auth_client is None:
            raise RuntimeError('auth client is required for bind')
        auth_code = str(auth_code).strip()
        if not auth_code:
            raise ValueError('auth_code is required')
        return self.auth_client.exchange(auth_code)

    def build_request_id(self, request_id=''):
        request_id = str(request_id or '').strip()
        if request_id:
            return request_id
        return 'rq_{0}'.format(uuid.uuid4().hex[:16])

    def ensure_session(self):
        if self.token_store is None:
            return
        session = self.token_store.get()
        if not session or not session.get('token'):
            raise RuntimeError(BIND_HINT)
        if self.token_store.is_expiring():
            if self.auth_client is None:
                raise RuntimeError('mcp token expiring but auth client missing')
            self.auth_client.refresh(session['token'])

    def call_tool(self, name, arguments=None, request_id=''):
        if name not in self._tools:
            raise KeyError('tool not registered: {0}'.format(name))
        tool = self._tools[name]
        if getattr(tool, 'requires_session', True):
            self.ensure_session()
        arguments = arguments or {}
        request_id = self.build_request_id(request_id)
        return tool.call(request_id=request_id, **arguments)

    def create_protocol_handler(self):
        return McpProtocolHandler(self)

    def run_cli(self, argv=None, stdin=None, stdout=None):
        stdin = stdin or sys.stdin
        stdout = stdout or sys.stdout
        parser = argparse.ArgumentParser(prog='mcp-gateway')
        subparsers = parser.add_subparsers(dest='command', required=True)

        subparsers.add_parser('list-tools')
        subparsers.add_parser('serve-stdio')

        bind_parser = subparsers.add_parser('bind')
        bind_parser.add_argument('--auth-code', required=True)

        call_parser = subparsers.add_parser('call')
        call_parser.add_argument('--tool', required=True)
        call_parser.add_argument('--keyword', required=True)
        call_parser.add_argument('--page', type=int, default=1)
        call_parser.add_argument('--limit', type=int, default=20)
        call_parser.add_argument('--request-id', default='')

        args = parser.parse_args(argv or [])

        if args.command == 'list-tools':
            payload = self.list_tools()
        elif args.command == 'serve-stdio':
            return self.create_protocol_handler().run_stdio(stdin=stdin, stdout=stdout)
        elif args.command == 'bind':
            payload = self.bind(args.auth_code)
        elif args.command == 'call':
            payload = self.call_tool(
                args.tool,
                {
                    'keyword': args.keyword,
                    'page': args.page,
                    'limit': args.limit,
                },
                request_id=args.request_id,
            )
        else:
            raise RuntimeError('unsupported command')

        stdout.write(json.dumps(payload, ensure_ascii=False))
        return 0


def main(argv=None):
    config = GatewayConfig.from_env()
    app = GatewayApp.from_config(config)
    return app.run_cli(argv=argv)


if __name__ == '__main__':
    raise SystemExit(main(sys.argv[1:]))