socket.io：如何从其他套接字获取套接字变量？

Question

There are two players in one room.

Every player has a color saved as a socket variable:

socket.on('join', function(color){socket.color = color});

It is easy to get this color variable, when the client with this color triggers the request:

socket.on('own_color', function(){

    console.log('own color:     ' + socket.color);

});

But now we need the color of the other player. Maybe we can get it somehow by using the other player's socket id:

socket.on('partner color', function(){

    var partnerid = io.sockets.clients('room1')[0].id;
    var partnercolor = '????????'

    console.log('partner color     ' + partnercolor);

});

Do you know how to get the color of the other player?

Answer 1

Somewhere, you're calling io.listen - make sure you store that result:

socketio = io.listen(...)

Then, you can get the socket object based on a socket ID:

socketio.sockets.sockets[idSocket]

Answer 2

you will have to communicate over the socket, requesting the data you need. The socket connections itself are just a transport. If you need to know something "emit" a question and on the other side listen ("on") for that question and respond accordingly

guessing io.sockets.clients('room1') is a list of all clients in that room then:

io.sockets.clients('room1')[0].emit('request color');
io.sockets.clients('room1')[0].on('respond color', function (color) {
  console.log('color received', color);
});

and on the other side

socket.on('request color', function () {
  socket.emit(color);
});

Answer 3

Thanks to Aaron Dufour we can now post the missing snippet:

socket.on('partner color', function(){

    var partnerid = io.sockets.clients('room1')[0].id;
    var partnercolor = io.sockets.sockets[partnerid].color;
    console.log('partner color:  '+ partnercolor);

});

Our server combines express and socket.io, so maybe someone is interested, how io.listen is called in this case:

var express = require('express')
    , http = require('http');

var app = express();
var server = http.createServer(app);
var io = require('socket.io').listen(server);

server.listen(8080);