如何在GraphQL服务器中连接两个REST数据源？

const { ApolloServer, gql } = require('apollo-server');
const axios = require('axios');

// 定义GraphQL Schema
const typeDefs = gql`
  type Query {
    combinedData: CombinedDataType
  }

  type CombinedDataType {
    data1: Data1Type
    data2: Data2Type
  }

  type Data1Type {
    id: ID
    name: String
  }

  type Data2Type {
    id: ID
    value: Int
  }
`;

// 创建数据获取器
async function fetchData1() {
  const response = await axios.get('https://api.example.com/data1');
  return response.data;
}

async function fetchData2() {
  const response = await axios.get('https://api.example.com/data2');
  return response.data;
}

// 创建数据合并器
async function getCombinedData() {
  const data1 = await fetchData1();
  const data2 = await fetchData2();
  return { data1, data2 };
}

// 创建解析器
const resolvers = {
  Query: {
    combinedData: async () => {
      return getCombinedData();
    },
  },
};

// 创建Apollo Server实例
const server = new ApolloServer({ typeDefs, resolvers });

// 启动服务器
server.listen().then(({ url }) => {
  console.log(`🚀 Server ready at ${url}`);
});