Add function filterSocketsByUserInNamespace

[tomasbatto]

Reason

I was trying to find sockets corresponding to certain users to join them to a room and then emit a mesagge to that room from the namespace, but this message was never received by the sockets. Creating this new function allow me to achieve this.

Problem

const nsp = io.of('/game')

nsp.on('connection', function(socket){
    let usersSockets = passportSocketIo.filterSocketsByUser(io, (user) => {
              return user._id == 'someId'
            })
    usersSockets.forEach((uSocket)=> {
         uSocket.join('room1')
    })
   nsp.to('room1').emit('joined', 'the game will start soon')
})

Solution

const nsp = io.of('/game')

nsp.on('connection', function(socket){
    let usersSockets = passportSocketIo.filterSocketsByUserInNamespace(nsp, (user) => {
              return user._id == 'someId'
            })
    usersSockets.forEach((uSocket)=> {
         uSocket.join('room1')
    })
   nsp.to('room1').emit('joined', 'the game will start soon')
})