server.ts

import 'dotenv-safe/config';
import express from 'express';
import rateLimit from 'express-rate-limit';
import cors from 'cors';
import colors from 'colors';
import { ApolloServer } from 'apollo-server-express';
import { ApolloGateway } from '@apollo/gateway';
import { users } from './server/services';

const initGateway = async (): Promise<void> => {
  const PORT = process.env.PORT || 5000;
  const app = express();

  app.set('trust proxy', 1);
  app.use(
    rateLimit({
      windowMs: 1 * 60 * 1000,
      max: 100
    })
  );
  app.use(
    cors({
      credentials: true,
      origin:
        process.env.NODE_ENV === 'production'
          ? 'prod url'
          : 'http://localhost:3000'
    })
  );

  const gateway = new ApolloGateway({
    serviceList: [{ name: 'user', url: await users.startService(5001) }]
  });

  const apolloServer = new ApolloServer({
    gateway,
    subscriptions: false,
    playground: true
  });

  apolloServer.applyMiddleware({
    app,
    cors: false,
    path: '/graphql'
  });

  app.listen({ port: PORT }, (): void => {
    console.log(
      colors.cyan(
        `\n🚀  Gateway is now running on http://localhost:${PORT}/graphql`
      )
    );
  });
};

initGateway().catch(err =>
  console.error(colors.red(`Error starting server ${err.message}`))
);