Socket.io 1.4

Object.keys(io.sockets.sockets); 연결된 모든 소켓을 제공합니다.

Socket.io 1.0
socket.io 1.0부터 실제 허용되는 답변은 더 이상 유효하지 않습니다. 그래서 임시 수정으로 사용하는 작은 기능을 만들었습니다.

function findClientsSocket(roomId, namespace) {
    var res = []
    // the default namespace is "/"
    , ns = io.of(namespace ||"/");

    if (ns) {
        for (var id in ns.connected) {
            if(roomId) {
                var index = ns.connected[id].rooms.indexOf(roomId);
                if(index !== -1) {
                    res.push(ns.connected[id]);
                }
            } else {
                res.push(ns.connected[id]);
            }
        }
    }
    return res;
}

네임 스페이스 가 없는 API 가됩니다.

// var clients = io.sockets.clients();
// becomes : 
var clients = findClientsSocket();

// var clients = io.sockets.clients('room');
// all users from room `room`
// becomes
var clients = findClientsSocket('room');

네임 스페이스에 대한 API 는 다음과 같습니다.

// var clients = io.of('/chat').clients();
// becomes
var clients = findClientsSocket(null, '/chat');

// var clients = io.of('/chat').clients('room');
// all users from room `room`
// becomes
var clients = findClientsSocket('room', '/chat');

또한이 관련 질문을 참조하십시오 . 여기서 주어진 방의 소켓을 반환하는 함수를 제공합니다.

function findClientsSocketByRoomId(roomId) {
var res = []
, room = io.sockets.adapter.rooms[roomId];
if (room) {
    for (var id in room) {
    res.push(io.sockets.adapter.nsp.connected[id]);
    }
}
return res;
}

Socket.io 0.7

네임 스페이스 가 없는 API :

var clients = io.sockets.clients();
var clients = io.sockets.clients('room'); // all users from room `room`

대한 네임 스페이스

var clients = io.of('/chat').clients();
var clients = io.of('/chat').clients('room'); // all users from room `room`

참고 : socket.io API가 깨지기 쉽고 일부 솔루션은 구현 세부 사항에 의존하기 때문에 클라이언트를 직접 추적해야 할 수도 있습니다.

var clients = [];

io.sockets.on('connect', function(client) {
    clients.push(client); 

    client.on('disconnect', function() {
        clients.splice(clients.indexOf(client), 1);
    });
});

답변

io.sockets.clients();
or
io.sockets.clients('room'); 

var clients_in_the_room = io.sockets.adapter.rooms[roomId];
for (var clientId in clients_in_the_room ) {
  console.log('client: %s', clientId); //Seeing is believing 
  var client_socket = io.sockets.connected[clientId];//Do whatever you want with this
}

io.engine === io.eio // => true
Object.keys(io.engine.clients) // => [ 'US8AxrUrrDF_G7ZUAAAA', 'Ov2Ca24Olkhf2NHbAAAB' ]
Object.keys(io.eio.clients)    // => [ 'US8AxrUrrDF_G7ZUAAAA', 'Ov2Ca24Olkhf2NHbAAAB' ]

io.engine.clientsCount // => 2
io.eio.clientsCount    // => 2

io.sockets.sockets.map(function(e) {
    return e.username;
})

io.sockets.connected //Return {socket_1_id: {}, socket_2_id: {}} . This is the most convenient one, since you can just refer to io.sockets.connected[id] then do common things like emit()
io.sockets.sockets //Returns [{socket_1}, {socket_2}, ....]. Can refer to socket_i.id to distinguish
io.sockets.adapter.sids //Return {socket_1_id: {}, socket_2_id: {}} . Looks similar to the first one but the object is not actually the socket, just the information.

// Not directly helps but still relevant
io.sockets.adapter.rooms //Returns {room_1_id: {}, room_2_id: {}}
io.sockets.server.eio.clients //Return client sockets
io.sockets.server.eio.clientsCount //Return number of connected clients

const io = require('socket.io')();
io.clients((error, clients) => {
      if (error) throw error;
      console.log(clients); // => [6em3d4TJP8Et9EMNAAAA, G5p55dHhGgUnLUctAAAB]
});

const io = require('socket.io')();
io.of('/chat').clients((error, clients) => {
     if (error) throw error;
     console.log(clients); // => [PZDoMHjiu8PYfRiKAAAF, Anw2LatarvGVVXEIAAAD]
});

const io = require('socket.io')();
io.of('/chat').in('general').clients((error, clients) => {
      if (error) throw error;
      console.log(clients); // => [Anw2LatarvGVVXEIAAAD] 
});