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var sys = require("sys");
var fs = require("fs");
var events = require("events");
var dns = require('dns');
var Buffer = require('buffer').Buffer;
var IOWatcher = process.IOWatcher;
var binding = process.binding('net');
var socket = binding.socket;
var recvfrom = binding.recvfrom;
var close = binding.close;
var ENOENT = binding.ENOENT;
function isPort (x) { return parseInt(x) >= 0; }
var pool = null;
function getPool() {
/* TODO: this effectively limits you to 8kb maximum packet sizes */
var minPoolAvail = 1024 * 8;
var poolSize = 1024 * 64;
if (pool === null || (pool.used + minPoolAvail > pool.length)) {
pool = new Buffer(poolSize);
pool.used = 0;
}
return pool;
}
function Socket (type, listener) {
events.EventEmitter.call(this);
var self = this;
self.type = type;
if (type === "unix_dgram" || type === "udp4" || type === "udp6") {
self.fd = socket(self.type);
} else {
throw new Error("Bad socket type specified. Valid types are: unix_dgram, udp4, udp6");
}
if (typeof listener === 'function') {
self.on('message', listener);
}
self.watcher = new IOWatcher();
self.watcher.host = self;
self.watcher.callback = function () {
while (self.fd) {
var p = getPool();
var rinfo = recvfrom(self.fd, p, p.used, p.length - p.used, 0);
if (!rinfo) return;
self.emit('message', p.slice(p.used, p.used + rinfo.size), rinfo);
p.used += rinfo.size;
}
};
if (self.type === "udp4" || self.type === "udp6") {
self._startWatcher();
}
}
sys.inherits(Socket, events.EventEmitter);
exports.Socket = Socket;
exports.createSocket = function (type, listener) {
return new Socket(type, listener);
};
Socket.prototype.bind = function () {
var self = this;
if (this.type === "unix_dgram") { // bind(path)
if (typeof arguments[0] !== "string") {
throw new Error("unix_dgram sockets must be bound to a path in the filesystem");
}
this.path = arguments[0];
fs.unlink(this.path, function (err) { // unlink old file, OK if it doesn't exist
if (err && err.errno !== ENOENT) {
throw err;
} else {
try {
binding.bind(self.fd, self.path);
self._startWatcher();
self.emit("listening");
} catch (err) {
console.log("Error in unix_dgram bind of " + self.path);
console.log(err.stack);
throw err;
}
}
});
} else if (this.type === "udp4" || this.type === "udp6") { // bind(port, [address])
if (arguments[1] === undefined) {
// Not bind()ing a specific address. Use INADDR_ANY and OS will pick one.
// The address can be found with server.address()
binding.bind(self.fd, arguments[0]);
this.emit("listening");
} else {
// the first argument is the port, the second an address
this.port = arguments[0];
if (dns.isIP(arguments[1])) {
this.address = arguments[1];
binding.bind(self.fd, port, arguments[1]);
this.emit("listening");
} else {
dns.lookup(arguments[1], function (err, ip, addressType) {
// TODO - only look up proper record for address family
if (err) {
self.emit('error', err);
} else {
self.ip = ip;
binding.bind(self.fd, self.port, ip);
self.emit("listening");
}
});
}
}
}
};
Socket.prototype._startWatcher = function () {
if (! this._watcherStarted) {
this.watcher.set(this.fd, true, false); // listen for read ready, not write ready
this.watcher.start();
this._watcherStarted = true;
}
};
Socket.prototype.address = function () {
return binding.getsockname(this.fd);
};
Socket.prototype.setBroadcast = function(arg) {
if (arg) {
return binding.setBroadcast(this.fd, 1);
} else {
return binding.setBroadcast(this.fd, 0);
}
};
Socket.prototype.setTTL = function(arg) {
var newttl = parseInt(arg);
if (newttl > 0 && newttl < 256) {
return binding.setTTL(this.fd, newttl);
} else {
throw new Error("New TTL must be between 1 and 255");
}
};
// translate arguments from JS API into C++ API, after optional DNS lookup
Socket.prototype.send = function(buffer, offset, length) {
var self = this;
if (typeof offset !== "number" || typeof length !== "number") {
throw new Error("send takes offset and length as args 2 and 3");
}
if (this.type === "unix_dgram") { // send(buffer, offset, length, path [, callback])
if (typeof arguments[3] !== "string") {
throw new Error("unix_dgram sockets must send to a path in the filesystem");
}
self.sendto(buffer, offset, length, arguments[3], null, arguments[4]);
} else if (this.type === "udp4" || this.type === "udp6") { // send(buffer, offset, length, port, address [, callback])
if (typeof arguments[4] !== "string") {
throw new Error(this.type + " sockets must send to port, address");
}
if (dns.isIP(arguments[4])) {
self.sendto(arguments[0], arguments[1], arguments[2], arguments[3], arguments[4], arguments[5]);
} else {
var port = arguments[3],
callback = arguments[5];
// TODO - only look up proper record for address family
dns.lookup(arguments[4], function (err, ip, addressType) {
if (err) { // DNS error
if (callback) {
callback(err);
}
self.emit('error', err);
return;
}
self.sendto(buffer, offset, length, port, ip, callback);
});
}
}
};
Socket.prototype.sendto = function(buffer, offset, length, port, addr, callback) {
try {
var bytes = binding.sendto(this.fd, buffer, offset, length, 0, port, addr);
} catch (err) {
if (callback) {
callback(err);
}
return;
}
if (callback) {
callback(null, bytes);
}
};
Socket.prototype.close = function () {
var self = this;
if (!this.fd) throw new Error('Not running');
this.watcher.stop();
this._watcherStarted = false;
close(this.fd);
this.fd = null;
if (this.type === "unix_dgram" && this.path) {
fs.unlink(this.path, function () {
self.emit("close");
});
} else {
this.emit("close");
}
};