开源软件名称（OpenSource Name）：

enisdenjo/graphql-ws

开源软件地址(OpenSource Url)：

https://github.com/enisdenjo/graphql-ws

开源编程语言(OpenSource Language)：

TypeScript 96.2%

开源软件介绍(OpenSource Introduction)：

Coherent, zero-dependency, lazy, simple, GraphQL over WebSocket Protocol compliant server and client.

Use Server-Sent Events (SSE) instead? Check out graphql-sse!

Getting started

Install

yarn add graphql-ws

Create a GraphQL schema

import { GraphQLSchema, GraphQLObjectType, GraphQLString } from 'graphql';

/**
 * Construct a GraphQL schema and define the necessary resolvers.
 *
 * type Query {
 *   hello: String
 * }
 * type Subscription {
 *   greetings: String
 * }
 */
export const schema = new GraphQLSchema({
  query: new GraphQLObjectType({
    name: 'Query',
    fields: {
      hello: {
        type: GraphQLString,
        resolve: () => 'world',
      },
    },
  }),
  subscription: new GraphQLObjectType({
    name: 'Subscription',
    fields: {
      greetings: {
        type: GraphQLString,
        subscribe: async function* () {
          for (const hi of ['Hi', 'Bonjour', 'Hola', 'Ciao', 'Zdravo']) {
            yield { greetings: hi };
          }
        },
      },
    },
  }),
});

Start the server

With ws

import { WebSocketServer } from 'ws'; // yarn add ws
// import ws from 'ws'; yarn add ws@7
// const WebSocketServer = ws.Server;
import { useServer } from 'graphql-ws/lib/use/ws';
import { schema } from './previous-step';

const server = new WebSocketServer({
  port: 4000,
  path: '/graphql',
});

useServer({ schema }, server);

console.log('Listening to port 4000');

With uWebSockets.js

import uWS from 'uWebSockets.js'; // yarn add uWebSockets.js@uNetworking/uWebSockets.js#<tag>
import { makeBehavior } from 'graphql-ws/lib/use/uWebSockets';
import { schema } from './previous-step';

uWS
  .App()
  .ws('/graphql', makeBehavior({ schema }))
  .listen(4000, (listenSocket) => {
    if (listenSocket) {
      console.log('Listening to port 4000');
    }
  });

With fastify-websocket

import Fastify from 'fastify'; // yarn add fastify
import fastifyWebsocket from 'fastify-websocket'; // yarn add fastify-websocket
import { makeHandler } from 'graphql-ws/lib/use/fastify-websocket';
import { schema } from './previous-step';

const fastify = Fastify();
fastify.register(fastifyWebsocket);

fastify.get('/graphql', { websocket: true }, makeHandler({ schema }));

fastify.listen(4000, (err) => {
  if (err) {
    fastify.log.error(err);
    return process.exit(1);
  }
  console.log('Listening to port 4000');
});

Use the client

import { createClient } from 'graphql-ws';

const client = createClient({
  url: 'ws://localhost:4000/graphql',
});

// query
(async () => {
  const result = await new Promise((resolve, reject) => {
    let result;
    client.subscribe(
      {
        query: '{ hello }',
      },
      {
        next: (data) => (result = data),
        error: reject,
        complete: () => resolve(result),
      },
    );
  });

  expect(result).toEqual({ hello: 'Hello World!' });
})();

// subscription
(async () => {
  const onNext = () => {
    /* handle incoming values */
  };

  let unsubscribe = () => {
    /* complete the subscription */
  };

  await new Promise((resolve, reject) => {
    unsubscribe = client.subscribe(
      {
        query: 'subscription { greetings }',
      },
      {
        next: onNext,
        error: reject,
        complete: resolve,
      },
    );
  });

  expect(onNext).toBeCalledTimes(5); // we say "Hi" in 5 languages
})();