如何在Client中获取socket.io客户端的会话ID

Question

我想在socket.io客户端中获取客户端的会话ID.

这是我的socket.io客户端:

var socket = new io.Socket(config.host, {port: config.port, rememberTransport: false});
    // when connected, clear out display
    socket.on('connect',function() {
        console.log('dummy user connected');
    });
    socket.on('disconnect',function() {
        console.log('disconnected');
    });
    socket.connect();
    return socket;

我想得到这个客户端的会话ID,我怎么能得到它？

Answer 1

请仔细阅读我的入门知识.

更新:

var sio = require('socket.io'),
    app = require('express').createServer();

app.listen(8080);
sio = sio.listen(app);

sio.on('connection', function (client) {
  console.log('client connected');

  // send the clients id to the client itself.
  client.send(client.id);

  client.on('disconnect', function () {
    console.log('client disconnected');
  });
});

Answer 2

在socket.io> = 1.0上,在触发connect事件后:

var socket = io('localhost');
var id = socket.io.engine.id

Answer 3

*请注意:自v0.9起set,getAPI已被弃用*

以下代码仅应用于版本socket.io <0.9
请参阅:http://socket.io/docs/migrating-from-0-9/

它可以通过握手/授权机制完成.

var cookie = require('cookie');
io.set('authorization', function (data, accept) {
    // check if there's a cookie header
    if (data.headers.cookie) {
        // if there is, parse the cookie
        data.cookie = cookie.parse(data.headers.cookie);
        // note that you will need to use the same key to grad the
        // session id, as you specified in the Express setup.
        data.sessionID = data.cookie['express.sid'];
    } else {
       // if there isn't, turn down the connection with a message
       // and leave the function.
       return accept('No cookie transmitted.', false);
    }
    // accept the incoming connection
    accept(null, true);
});

现在可以通过socket.io连接对象的handshake属性访问分配给数据对象的所有属性.

io.sockets.on('connection', function (socket) {
    console.log('sessionID ' + socket.handshake.sessionID);
});

Answer 4

我只是遇到了同样的问题/问题并且像这样解决了它(只有客户端代码):

var io = io.connect('localhost');

io.on('connect', function () {
    console.log(this.socket.sessionid);
});

Answer 5

在服务器端

io.on('connection', socket => {
    console.log(socket.id)
})

在客户端

import io from 'socket.io-client';

socket = io.connect('http://localhost:5000');
socket.on('connect', () => {
    console.log(socket.id, socket.io.engine.id, socket.json.id)
})

如果socket.id, 不起作用，请确保在连接中on('connect')或连接后调用它。