metamaps--metamaps/realtime/signal.js

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var uuid = require('node-uuid')
// based off of https://github.com/andyet/signalmaster
// since it was updated to socket.io 1.3.7
function safeCb(cb) {
if (typeof cb === 'function') {
return cb;
} else {
return function () {};
}
}
module.exports = function(io, stunservers, state) {
io.on('connection', function (socket) {
socket.resources = {
screen: false,
video: true,
audio: false
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}
// pass a message to another id
socket.on('message', function (details) {
if (!details) return
var otherClient = io.to(details.to)
if (!otherClient) return
details.from = socket.id
otherClient.emit('message', details)
})
socket.on('shareScreen', function () {
socket.resources.screen = true
})
socket.on('unshareScreen', function (type) {
socket.resources.screen = false
removeFeed('screen')
})
socket.on('join', join)
function removeFeed(type) {
if (socket.room) {
io.sockets.in(socket.room).emit('remove', {
id: socket.id,
type: type
})
if (!type) {
socket.leave(socket.room)
socket.room = undefined
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}
}
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}
function join(name, cb) {
// sanity check
if (typeof name !== 'string') return
// leave any existing rooms
removeFeed()
safeCb(cb)(null, describeRoom(name))
socket.join(name)
socket.room = name
}
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// we don't want to pass "leave" directly because the
// event type string of "socket end" gets passed too.
socket.on('disconnect', function () {
removeFeed()
})
socket.on('leave', function () {
removeFeed()
})
socket.on('create', function (name, cb) {
if (arguments.length == 2) {
cb = (typeof cb == 'function') ? cb : function () {}
name = name || uuid()
} else {
cb = name
name = uuid()
}
// check if exists
var room = io.nsps['/'].adapter.rooms[name]
if (room && room.length) {
safeCb(cb)('taken')
} else {
join(name)
safeCb(cb)(null, name)
}
})
// support for logging full webrtc traces to stdout
// useful for large-scale error monitoring
socket.on('trace', function (data) {
console.log('trace', JSON.stringify(
[data.type, data.session, data.prefix, data.peer, data.time, data.value]
))
})
})
function describeRoom(name) {
var adapter = io.nsps['/'].adapter
var sockets = adapter.rooms[name] || {}
var result = {
clients: {}
}
Object.keys(sockets).forEach(function (id) {
result.clients[id] = adapter.nsp.connected[id].resources
})
return result
}
function socketsInRoom(name) {
return io.sockets.sockets(name).length
}
}