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var dns = process.binding('cares');
var watchers = {};
var activeWatchers = {};
var timer = new process.Timer();
timer.callback = function () {
var sockets = Object.keys(activeWatchers);
for (var i = 0, l = sockets.length; i < l; i++) {
var socket = sockets[i];
var s = parseInt(socket);
channel.processFD( watchers[socket].read ? s : dns.SOCKET_BAD
, watchers[socket].write ? s : dns.SOCKET_BAD
);
}
updateTimer();
}
function updateTimer() {
timer.stop();
// Were just checking to see if activeWatchers is empty or not
for (var socket in activeWatchers) {
if (activeWatchers.hasOwnProperty(socket)) {
var max = 20000;
var timeout = channel.timeout(max);
timer.start(timeout, 0);
// Short circuit the loop on first find.
return;
}
}
}
var channel = new dns.Channel({SOCK_STATE_CB: function (socket, read, write) {
var watcher;
if (socket in watchers) {
watcher = watchers[socket].watcher;
} else {
watcher = new process.IOWatcher();
watchers[socket] = { read: read
, write: write
, watcher: watcher
};
watcher.callback = function(read, write) {
channel.processFD( read ? socket : dns.SOCKET_BAD
, write ? socket : dns.SOCKET_BAD
);
updateTimer();
}
}
watcher.set(socket, read == 1, write == 1);
if (!(read || write)) {
watcher.stop();
delete activeWatchers[socket];
return;
} else {
watcher.start();
activeWatchers[socket] = watcher;
}
updateTimer();
}});
exports.resolve = function (domain, type_, callback_) {
var type, callback;
if (typeof(type_) == 'string') {
type = type_;
callback = callback_;
} else {
type = 'A';
callback = arguments[1];
}
var resolveFunc = resolveMap[type];
if (typeof(resolveFunc) == 'function') {
resolveFunc(domain, callback);
} else {
throw new Error('Unknown type "' + type + '"');
}
}
exports.getHostByName = function (domain, callback) {
channel.getHostByName(domain, dns.AF_INET, callback);
};
var net;
// Easy DNS A/AAAA look up
exports.lookup = function (domain, callback) {
var addressType = dns.isIP(domain);
if (addressType) {
process.nextTick(function () {
callback(null, domain, addressType);
});
} else {
if (/\w\.local\.?$/.test(domain) ) {
// ANNOYING: In the case of mDNS domains use NSS in the thread pool.
// I wish c-ares had better support.
process.binding('net').getaddrinfo(domain, 4, function (err, domains4) {
callback(err, domains4[0], 4);
});
} else {
channel.getHostByName(domain, dns.AF_INET, function (err, domains4) {
if (domains4 && domains4.length) {
callback(null, domains4[0], 4);
} else {
channel.getHostByName(domain, dns.AF_INET6, function (err, domains6) {
if (domains6 && domains6.length) {
callback(null, domains6[0], 6);
} else {
callback(err, []);
}
});
}
});
}
}
};
exports.resolve4 = function(domain, callback) { channel.query(domain, dns.A, callback) };
exports.resolve6 = function(domain, callback) { channel.query(domain, dns.AAAA, callback) };
exports.resolveMx = function(domain, callback) { channel.query(domain, dns.MX, callback) };
exports.resolveTxt = function(domain, callback) { channel.query(domain, dns.TXT, callback) };
exports.resolveSrv = function(domain, callback) { channel.query(domain, dns.SRV, callback) };
exports.reverse = function(domain, callback) { channel.query(domain, dns.PTR, callback) };
exports.resolveNs = function(domain, callback) { channel.query(domain, dns.NS, callback) };
var resolveMap = {
'A' : exports.resolve4,
'AAAA': exports.resolve6,
'MX' : exports.resolveMx,
'TXT' : exports.resolveTxt,
'SRV' : exports.resolveSrv,
'PTR' : exports.resolvePtr,
'NS' : exports.resolveNs,
};
// ERROR CODES
exports.NODATA = dns.NODATA;
exports.FORMERR = dns.FORMERR;
exports.BADRESP = dns.BADRESP;
exports.NOTFOUND = dns.NOTFOUND;
exports.BADNAME = dns.BADNAME;
exports.TIMEOUT = dns.TIMEOUT;
exports.CONNREFUSED = dns.CONNREFUSED;
exports.NOMEM = dns.NOMEM;
exports.DESTRUCTION = dns.DESTRUCTION;
exports.NOTIMP = dns.NOTIMP;
exports.EREFUSED = dns.EREFUSED;
exports.SERVFAIL = dns.SERVFAIL;
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