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