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| /*
* Copyright 2014-2016, Sébastien Piquemal <sebpiq@gmail.com>
*
* rhizome is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* rhizome is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with rhizome. If not, see <http://www.gnu.org/licenses/>.
*/
"use strict";
var EventEmitter = require('events').EventEmitter
, dgram = require('dgram')
, net = require('net')
, _ = require('underscore')
, oscMin = require('osc-min')
exports.createClient = function(host, port, transport) {
if (transport === 'udp') {
return new UDPClient(host, port)
} else if (transport === 'tcp') {
return new TCPClient(host, port)
} else throw new Error('invalid transport ' + transport)
}
exports.createServer = function(port, transport) {
if (transport === 'udp') {
return new UDPServer(port)
} else if (transport === 'tcp') {
return new TCPServer(port)
} else throw new Error('invalid transport ' + transport)
}
// Base class for OSC over UDP/TCP server
var _BaseServer = exports._BaseServer = function(port) {
EventEmitter.call(this)
this.port = port
this._status = 'stopped'
this._createSocket()
}
_.extend(_BaseServer.prototype, EventEmitter.prototype, {
// There's no way to know with node 0.10 that a port is already bound with UDP.
// So to make things a bit more safe (especially for tests), we make sure
// that we don't bind twice to the same port (otherwise unexpected things might happen).
start: function(done) {
if (this._status === 'stopped') {
this._sock.once('listening', () => {
this._status = 'started'
this._sock.removeAllListeners('error')
this._sock.on('error', (err) => this.emit('error', err))
Eif (done) done()
})
this._sock.once('error', (err) => {
this._sock.removeAllListeners('listening')
if (done) done(err)
else this.emit('error', err)
})
this._bindSocket()
} else Eif (done) done()
},
stop: function(done) {
if (this._status === 'started') {
this._sock.removeAllListeners('close')
this._sock.once('close', () => {
this._status = 'stopped'
this._createSocket()
this._sock.on('error', () => {})
done()
})
this._sock.close()
} else done()
},
// This just creates the socket and adds the event handlers for messaging.
// At this stage the socket is not bound yet
// _createSocket: function() { throw new Error('Implement me') },
// This should bind the socket
// _bindSocket: function() { throw new Error('Implement me') }
})
// OSC over UDP server
var UDPServer = function(port) {
_BaseServer.apply(this, arguments)
}
_.extend(UDPServer.prototype, _BaseServer.prototype, {
transport: 'udp',
_createSocket: function() {
if (this._sock) this._sock.removeAllListeners()
this._sock = dgram.createSocket('udp4')
this._sock.on('message', (msg, rinfo) => {
msg = oscMin.fromBuffer(msg)
this.emit('message', msg.address, _.pluck(msg.args, 'value'), rinfo)
})
},
_bindSocket: function() { this._sock.bind(this.port) }
})
// OSC over TCP server
var TCPServer = function(port) {
_BaseServer.apply(this, arguments)
}
_.extend(TCPServer.prototype, _BaseServer.prototype, {
transport: 'tcp',
_createSocket: function() {
if (this._sock) this._sock.removeAllListeners()
this._sock = net.createServer()
this._sock.on('connection', (connection) => {
var buffers = []
connection.on('error', (err) => this.emit('error', err))
connection.on('data', (buf) => buffers.push(buf))
connection.on('end', () => {
var msg = oscMin.fromBuffer(Buffer.concat(buffers))
this.emit('message', msg.address, _.pluck(msg.args, 'value'))
connection.removeAllListeners()
connection.on('error', () => {})
})
})
},
_bindSocket: function() { this._sock.listen(this.port) }
})
// Base class for OSC over UDP/TCP clients
var _BaseClient = function (host, port) {
EventEmitter.call(this)
this.host = host
this.port = port
this._ongoingSendsCount = 0
}
_.extend(_BaseClient.prototype, EventEmitter.prototype, {
// Sends a message
// send: function(address, args) { throw new Error('Implement me') }
// Closes client and emits "close"
close: function() {
Iif (this._ongoingSendsCount)
this._sock.once('_sendsAllDone', () => this.emit('close'))
else process.nextTick(() => this.emit('close'))
},
// These 2 callbacks allow to keep track of sending operations,
// in order to be able to close the client in a clean way.
_onSendStart: function() {
this._ongoingSendsCount++
},
_onSendDone: function() {
this._ongoingSendsCount--
if (!this._ongoingSendsCount) this.emit('_sendsAllDone')
}
})
// OSC over UDP client
var UDPClient = function (host, port) {
_BaseClient.apply(this, arguments)
this._sock = dgram.createSocket('udp4')
this._sock.on('error', (err) => this.emit('error', err))
}
_.extend(UDPClient.prototype, _BaseClient.prototype, {
transport: 'udp',
send: function (address, args) {
args = args || []
var buf = oscMin.toBuffer({ address: address, args: args })
this._onSendStart()
this._sock.send(buf, 0, buf.length, this.port, this.host, (err, bytesSent) => {
Iif (bytesSent !== buf.length)
err = new Error('was not sent properly')
if (err) this.emit('error', err)
this._onSendDone()
})
},
close: function() {
this.on('close', () => {
this._sock.removeAllListeners('error')
this._sock.on('error', () => {})
this._sock = null
})
_BaseClient.prototype.close.call(this)
}
})
// OSC over TCP client
var TCPClient = function (host, port) {
_BaseClient.apply(this, arguments)
}
_.extend(TCPClient.prototype, _BaseClient.prototype, {
transport: 'tcp',
send: function (address, args) {
args = args || []
var buf = oscMin.toBuffer({ address: address, args: args })
, i = -1
, size = 512
, sock = net.connect(this.port, this.host)
sock.on('error', (err) => this.emit('error', err))
this._onSendStart()
var writeNextPacket = () => {
if ((size * i) < buf.length) {
i++
Eif (sock.write(buf.slice(size * i, size * (i + 1)))) writeNextPacket()
else sock.once('drain', writeNextPacket)
} else {
sock.end()
}
}
sock.on('connect', writeNextPacket)
sock.on('close', () => {
sock.removeAllListeners()
sock.on('error', () => {}) // Silencing potential errors
this._onSendDone()
})
}
}) |