Question

我是graphql的新手...这是我的服务器文件...我无法建立套接字io连接... 当我在套接字内部进行控制时，它不会进入函数内...我认为我在这里做错了const io = require('socket.io')(server) ...

var express = require('express');
var graphqlHTTP = require('express-graphql');
var {schema} = require('../graphql/schema');
var {root} = require('../graphql/resolver');

const EventEmitter = require('events');
var app = express();
var server = require('http').Server(app);
const event = new EventEmitter()
const io = require('socket.io')(server)
event.on('event', function(action) {
  console.log(action)
  io.on('connection', function (socket) {
    console.log('socket')
    socket.emit('action', action)
  })
})

app.use('/graphql', graphqlHTTP({
  schema: schema,
  rootValue: root,
  graphiql: true,
  formatError(err) {
    return {
      message: err.message
    };
  }
}));
app.use('/voyager', middleware({ endpointUrl: '/graphql' }));
app.listen(3019);

Answer 1

apollo server-“ ...是使用来自任何来源的数据为GraphQL客户端快速构建可用于生产的自文档化API的最佳方法。”

apollo-server-express-将apollo用作应用程序变量的“中间件”

// Node modules imports
require('dotenv').config({ path: './variables.env' })
const express = require('express')
const socketio = require('socket.io')
const { ApolloServer, gql } = require('apollo-server-express')

// Initalizes the app server
const app = express()

const typeDefs = gql`
  type Query {
    foo: String
  }
`;

const resolvers = {
  Query: {
    foo: () => 'Foo world!'
  },
};

const server = new ApolloServer({ typeDefs, resolvers });
server.applyMiddleware({ app });


// Listen to port 5000, save on const to attach io to it
const http = app.listen(5000, () =>
  console.log("? Server ready at http://localhost:5000" + server.graphqlPath)
)

// Attach socket.io to the server instance
const io = socketio(http)
io.on('connection', (socket) => {
   // related io code
})

我强烈建议您阅读apollo

中的文档

已更新@Coder

请记住，始终将所有io代码包装在io的连接方法中。
顺便说一句，您要创建两个服务器实例，一个Express和一个Http。
将服务器从express存储到const中，并用于socket.io。

const app = express()
const server = app.listen(3019)

const io = require('socket.io')(server)
io.on('connection', (socket) => {
    console.log('connected to socket')
    // do event here inside
    // enter code here
    socket.on('some_event',()=>{ // do something })
    socket.on('some_event_2',()=>{ // do something 2 })
    socket.on('some_event_3',()=>{ // do something 3 })
})

Answer 2

socket.io 文档不推荐使用 express 的 app.listen()，您可以使用它来代替

const http = require("http");
const app = express();
const httpServer = createServer(app);
const io = require('socket.io')(httpServer);
io.on("connection", (socket) => {
  console.log("Connected");
  // your code
});
httpServer.listen(PORT, () =>
  console.log(`Server stated on http://127.0.0.1:${PORT}/`)
);

您可以在快递部分引用此socket.io docs

如何建立socket io和graphql的连接？

2 个答案:

socket.io 文档不推荐使用 express 的 app.listen()，您可以使用它来代替