如何将 Apollo-Gateway 与 swagger-to-graphql 工具一起使用？

Question

我正在通过 swagger-to-graphql npm 模块使用 Swagger Petstore，并且能够运行 GraphQL Playground。

graphQLSchema('./swagger.json', 'http://petstore.swagger.io/v2', {
  Authorization: 'Basic YWRkOmJhc2ljQXV0aA=='
}).then(schema => {
  const app = express();
  app.use('/', graphqlHTTP(() => {
    return {
      schema,
      graphiql: true
    };
  }));
  app.listen(4001, 'localhost', () => {
    console.info('http://localhost:4001/');
  });
}).catch(e => {
  console.log(e);
});

但是，当我尝试将服务提供给 Apollo Gateway 时，它抛出 Error: Apollo Server requires either an existing schema or typeDefs

const gateway = new ApolloGateway({
  serviceList: [
    { name: 'pet', url: 'http://localhost:4001' }
  ],
});
const server = new ApolloServer({
  gateway,

  // Currently, subscriptions are enabled by default with Apollo Server, however,
  // subscriptions are not compatible with the gateway.  We hope to resolve this
  // limitation in future versions of Apollo Server.  Please reach out to us on
  // https://spectrum.chat/apollo/apollo-server if this is critical to your adoption!
  subscriptions: false,
});

server.listen().then(({ url }) => {
  console.log(` Server ready at ${url}`);
});

我错过了什么？

Answer 1

来自the docs：

Converting an existing schema into a federated service is the first step in building a federated graph. To do this, we'll use the buildFederatedSchema() function from the @apollo/federation package.

您不能只向网关提供任何现有服务 -- 该服务必须满足 federation spec. The only way to currently do that is to use buildFederatedSchema to create the service's schema. At this time, buildFederatedSchema does not accept existing schemas 因此联合与为您生成模式的任何其他工具不兼容。希望不久的将来会添加该功能。

如何将 Apollo-Gateway 与 swagger-to-graphql 工具一起使用？

How to use Apollo-Gateway with swagger-to-graphql tool?

graphql

apollo-server

apollo-client

apollo-gateway