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| (function () { 'use strict';
const assert = require('assert');
const util = require('util');
const events = require('events');
const constants = require('constants');
const UDP = process.binding('udp_wrap').UDP;
const SendWrap = process.binding('udp_wrap').SendWrap;
const BIND_STATE_UNBOUND = 0;
const BIND_STATE_BINDING = 1;
const BIND_STATE_BOUND = 2;
// lazily loaded
var cluster = null;
var dns = null;
const errnoException = util._errnoException;
const exceptionWithHostPort = util._exceptionWithHostPort;
function lookup(address, family, callback) {
if (!dns)
dns = require('dns');
return dns.lookup(address, family, callback);
}
function lookup4(address, callback) {
return lookup(address || '0.0.0.0', 4, callback);
}
function lookup6(address, callback) {
return lookup(address || '::0', 6, callback);
}
function newHandle(type) {
if (type == 'udp4') {
var handle = new UDP();
handle.lookup = lookup4;
return handle;
}
Eif (type == 'udp6') {
var handle = new UDP();
handle.lookup = lookup6;
handle.bind = handle.bind6;
handle.send = handle.send6;
return handle;
}
if (type == 'unix_dgram')
throw new Error('unix_dgram sockets are not supported any more.');
throw new Error('Bad socket type specified. Valid types are: udp4, udp6');
}
exports._createSocketHandle = function(address, port, addressType, fd) {
// Opening an existing fd is not supported for UDP handles.
assert(typeof fd !== 'number' || fd < 0);
var handle = newHandle(addressType);
Eif (port || address) {
var err = handle.bind(address, port || 0, 0);
Iif (err) {
handle.close();
return err;
}
}
return handle;
};
function Socket(type, listener) {
events.EventEmitter.call(this);
Iif (typeof type === 'object') {
var options = type;
type = options.type;
}
var handle = newHandle(type);
handle.owner = this;
this._handle = handle;
this._receiving = false;
this._bindState = BIND_STATE_UNBOUND;
this.type = type;
this.fd = null; // compatibility hack
// If true - UV_UDP_REUSEADDR flag will be set
this._reuseAddr = options && options.reuseAddr;
if (typeof listener === 'function')
this.on('message', listener);
}
util.inherits(Socket, events.EventEmitter);
exports.Socket = Socket;
exports.createSocket = function(type, listener) {
return new Socket(type, listener);
};
function startListening(socket) {
socket._handle.onmessage = onMessage;
// Todo: handle errors
socket._handle.recvStart();
socket._receiving = true;
socket._bindState = BIND_STATE_BOUND;
socket.fd = -42; // compatibility hack
socket.emit('listening');
}
function replaceHandle(self, newHandle) {
// Set up the handle that we got from master.
newHandle.lookup = self._handle.lookup;
newHandle.bind = self._handle.bind;
newHandle.send = self._handle.send;
newHandle.owner = self;
// Replace the existing handle by the handle we got from master.
self._handle.close();
self._handle = newHandle;
}
Socket.prototype.bind = function(port /*, address, callback*/) {
var self = this;
self._healthCheck();
Iif (this._bindState != BIND_STATE_UNBOUND)
throw new Error('Socket is already bound');
this._bindState = BIND_STATE_BINDING;
if (typeof arguments[arguments.length - 1] === 'function')
self.once('listening', arguments[arguments.length - 1]);
if (port instanceof UDP) {
replaceHandle(self, port);
startListening(self);
return self;
}
var address;
var exclusive;
if (port !== null && typeof port === 'object') {
address = port.address || '';
exclusive = !!port.exclusive;
port = port.port;
} else {
address = typeof arguments[1] === 'function' ? '' : arguments[1];
exclusive = false;
}
// resolve address first
self._handle.lookup(address, function(err, ip) {
Iif (err) {
self._bindState = BIND_STATE_UNBOUND;
self.emit('error', err);
return;
}
if (!cluster)
cluster = require('cluster');
if (cluster.isWorker && !exclusive) {
cluster._getServer(self, ip, port, self.type, -1, function(err, handle) {
Iif (err) {
var ex = exceptionWithHostPort(err, 'bind', ip, port);
self.emit('error', ex);
self._bindState = BIND_STATE_UNBOUND;
return;
}
Iif (!self._handle)
// handle has been closed in the mean time.
return handle.close();
replaceHandle(self, handle);
startListening(self);
});
} else {
if (!self._handle)
return; // handle has been closed in the mean time
var flags = 0;
Iif (self._reuseAddr)
flags |= constants.UV_UDP_REUSEADDR;
var err = self._handle.bind(ip, port || 0, flags);
if (err) {
var ex = exceptionWithHostPort(err, 'bind', ip, port);
self.emit('error', ex);
self._bindState = BIND_STATE_UNBOUND;
// Todo: close?
return;
}
startListening(self);
}
});
return self;
};
// thin wrapper around `send`, here for compatibility with dgram_legacy.js
Socket.prototype.sendto = function(buffer,
offset,
length,
port,
address,
callback) {
Iif (typeof offset !== 'number' || typeof length !== 'number')
throw new Error('send takes offset and length as args 2 and 3');
Iif (typeof address !== 'string')
throw new Error(this.type + ' sockets must send to port, address');
this.send(buffer, offset, length, port, address, callback);
};
Socket.prototype.send = function(buffer,
offset,
length,
port,
address,
callback) {
var self = this;
if (typeof buffer === 'string')
buffer = new Buffer(buffer);
if (!(buffer instanceof Buffer))
throw new TypeError('First argument must be a buffer or string.');
offset = offset | 0;
if (offset < 0)
throw new RangeError('Offset should be >= 0');
if ((length == 0 && offset > buffer.length) ||
(length > 0 && offset >= buffer.length))
throw new RangeError('Offset into buffer too large');
// Sending a zero-length datagram is kind of pointless but it _is_
// allowed, hence check that length >= 0 rather than > 0.
length = length | 0;
if (length < 0)
throw new RangeError('Length should be >= 0');
if (offset + length > buffer.length)
throw new RangeError('Offset + length beyond buffer length');
port = port | 0;
if (port <= 0 || port > 65535)
throw new RangeError('Port should be > 0 and < 65536');
// Normalize callback so it's either a function or undefined but not anything
// else.
if (typeof callback !== 'function')
callback = undefined;
self._healthCheck();
if (self._bindState == BIND_STATE_UNBOUND)
self.bind({port: 0, exclusive: true}, null);
// If the socket hasn't been bound yet, push the outbound packet onto the
// send queue and send after binding is complete.
if (self._bindState != BIND_STATE_BOUND) {
// If the send queue hasn't been initialized yet, do it, and install an
// event handler that flushes the send queue after binding is done.
if (!self._sendQueue) {
self._sendQueue = [];
self.once('listening', function() {
// Flush the send queue.
for (var i = 0; i < self._sendQueue.length; i++)
self.send.apply(self, self._sendQueue[i]);
self._sendQueue = undefined;
});
}
self._sendQueue.push([buffer, offset, length, port, address, callback]);
return;
}
self._handle.lookup(address, function(ex, ip) {
Iif (ex) {
if (callback) callback(ex);
self.emit('error', ex);
} else if (self._handle) {
var req = new SendWrap();
req.buffer = buffer; // Keep reference alive.
req.length = length;
req.address = address;
req.port = port;
if (callback) {
req.callback = callback;
req.oncomplete = afterSend;
}
var err = self._handle.send(req,
buffer,
offset,
length,
port,
ip,
!!callback);
Iif (err && callback) {
// don't emit as error, dgram_legacy.js compatibility
var ex = exceptionWithHostPort(err, 'send', address, port);
process.nextTick(callback, ex);
}
}
});
};
function afterSend(err) {
if (err) {
err = exceptionWithHostPort(err, 'send', this.address, this.port);
}
var self = this;
setImmediate(function() {
self.callback(err, self.length);
});
}
Socket.prototype.close = function(callback) {
if (typeof callback === 'function')
this.on('close', callback);
this._healthCheck();
this._stopReceiving();
this._handle.close();
this._handle = null;
var self = this;
process.nextTick(socketCloseNT, self);
return this;
};
function socketCloseNT(self) {
self.emit('close');
}
Socket.prototype.address = function() {
this._healthCheck();
var out = {};
var err = this._handle.getsockname(out);
Iif (err) {
throw errnoException(err, 'getsockname');
}
return out;
};
Socket.prototype.setBroadcast = function(arg) {
var err = this._handle.setBroadcast(arg ? 1 : 0);
if (err) {
throw errnoException(err, 'setBroadcast');
}
};
Socket.prototype.setTTL = function(arg) {
if (typeof arg !== 'number') {
throw new TypeError('Argument must be a number');
}
var err = this._handle.setTTL(arg);
if (err) {
throw errnoException(err, 'setTTL');
}
return arg;
};
Socket.prototype.setMulticastTTL = function(arg) {
Iif (typeof arg !== 'number') {
throw new TypeError('Argument must be a number');
}
var err = this._handle.setMulticastTTL(arg);
if (err) {
throw errnoException(err, 'setMulticastTTL');
}
return arg;
};
Socket.prototype.setMulticastLoopback = function(arg) {
var err = this._handle.setMulticastLoopback(arg ? 1 : 0);
if (err) {
throw errnoException(err, 'setMulticastLoopback');
}
return arg; // 0.4 compatibility
};
Socket.prototype.addMembership = function(multicastAddress,
interfaceAddress) {
this._healthCheck();
if (!multicastAddress) {
throw new Error('multicast address must be specified');
}
var err = this._handle.addMembership(multicastAddress, interfaceAddress);
if (err) {
throw errnoException(err, 'addMembership');
}
};
Socket.prototype.dropMembership = function(multicastAddress,
interfaceAddress) {
this._healthCheck();
if (!multicastAddress) {
throw new Error('multicast address must be specified');
}
var err = this._handle.dropMembership(multicastAddress, interfaceAddress);
if (err) {
throw errnoException(err, 'dropMembership');
}
};
Socket.prototype._healthCheck = function() {
Iif (!this._handle)
throw new Error('Not running'); // error message from dgram_legacy.js
};
Socket.prototype._stopReceiving = function() {
if (!this._receiving)
return;
this._handle.recvStop();
this._receiving = false;
this.fd = null; // compatibility hack
};
function onMessage(nread, handle, buf, rinfo) {
var self = handle.owner;
Iif (nread < 0) {
return self.emit('error', errnoException(nread, 'recvmsg'));
}
rinfo.size = buf.length; // compatibility
self.emit('message', buf, rinfo);
}
Socket.prototype.ref = function() {
Eif (this._handle)
this._handle.ref();
return this;
};
Socket.prototype.unref = function() {
Eif (this._handle)
this._handle.unref();
return this;
};
}());
|