Nodejs：通过socketio断开客户端与服务器的连接

Question

我尝试使用 socket.io 以实时形式发送我的数据，以便创建服务器：

const http = require('http').createServer();
const socket = require('socket.io')(http);

socket.on('connection', socket => {

    console.log('connected:', socket.client.id);

    socket.on('start', data => {
        console.log('new message from client:', data);
    });

    socket.on("disconnect", () => console.log("Client disconnected"));
});

http.listen(3000, () => console.log(`server listening on port: ${3000}`))

在客户端部分我创建了这个脚本：

const socket = require('socket.io-client')('http://localhost:3000');

socket.on('connect', () => {
    // socket connected
    socket.emit('start', { my: 'data' });
    setInterval(() => {
        socket.disconnect();
    }, 1000);

});

想象一下，在客户端连接到服务器并将数据发送到服务器后想要与服务器断开连接，所以我输入了这个命令：

setInterval(() => {
    socket.disconnect();
}, 1000);

执行此命令时出现此错误：

D:\Projects\NodeJs\SafaProjects\socket\client>node client.js
D:\Projects\NodeJs\SafaProjects\socket\client\node_modules\socket.io-client\lib\socket.js:136
Socket.prototype.emit = function (ev) {
                                 ^

RangeError: Maximum call stack size exceeded
    at Socket.emit (D:\Projects\NodeJs\SafaProjects\socket\client\node_modules\socket.io-client\lib\socket.js:136:34)
    at Socket.socket.on (D:\Projects\NodeJs\SafaProjects\socket\client\client.js:13:12)     
    at Socket.Emitter.emit (D:\Projects\NodeJs\SafaProjects\socket\client\node_modules\component-emitter\index.js:133:20)
    at Socket.emit (D:\Projects\NodeJs\SafaProjects\socket\client\node_modules\socket.io-client\lib\socket.js:138:10)
    at Socket.socket.on (D:\Projects\NodeJs\SafaProjects\socket\client\client.js:13:12)     
    at Socket.Emitter.emit (D:\Projects\NodeJs\SafaProjects\socket\client\node_modules\component-emitter\index.js:133:20)
    at Socket.emit (D:\Projects\NodeJs\SafaProjects\socket\client\node_modules\socket.io-client\lib\socket.js:138:10)
    at Socket.socket.on (D:\Projects\NodeJs\SafaProjects\socket\client\client.js:13:12)     
    at Socket.Emitter.emit (D:\Projects\NodeJs\SafaProjects\socket\client\node_modules\component-emitter\index.js:133:20)
    at Socket.emit (D:\Projects\NodeJs\SafaProjects\socket\client\node_modules\socket.io-client\lib\socket.js:138:10)

客户端如何才能不出错地与服务器断开连接？

Answer 1

因为你一遍又一遍地打电话给socket.disconnect()。向socket.emit() 提供一个回调函数，您可以在其中调用socket.disconnect。

服务器

const http = require('http').createServer();
const socket = require('socket.io')(http);

socket.on('connection', socket => {

    console.log('connected:', socket.client.id);

    socket.on('start', data => {
        console.log('new message from client:', data);
        socket.emit ('messageSuccess', data);
    });

    socket.on("disconnect", () => console.log("Client disconnected"));
});

http.listen(3000, () => console.log(`server listening on port: ${3000}`))

客户

const socket = require('socket.io-client')('http://localhost:3000');

socket.on('connect', () => {
    // socket connected
    socket.emit('start', { my: 'data' };

socket.on ('messageSuccess', function (data) {
 socket.disconnect();
});
});