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blazzyry
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c-ares based dns module
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‎lib/dns_cares.js‎

Lines changed: 121 additions & 0 deletions
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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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for (var socket in activeWatchers) {
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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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for (var socket in activeWatchers) { // if !empty(activeWatchers)
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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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return;
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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.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.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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'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;

‎src/node.cc‎

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Original file line numberDiff line numberDiff line change
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#include <node_net2.h>
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#include <node_events.h>
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#include <node_dns.h>
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#include <node_cares.h>
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#include <node_net.h>
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#include <node_file.h>
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#include <node_idle_watcher.h>
@@ -1194,6 +1195,15 @@ static Handle<Value> Binding(const Arguments& args) {
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binding_cache->Set(module, exports);
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}
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} else if (!strcmp(*module_v, "cares")) {
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if (binding_cache->Has(module)) {
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exports = binding_cache->Get(module)->ToObject();
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} else {
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exports = Object::New();
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Cares::Initialize(exports);
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binding_cache->Set(module, exports);
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}
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} else if (!strcmp(*module_v, "fs")) {
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if (binding_cache->Has(module)) {
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exports = binding_cache->Get(module)->ToObject();
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exports->Set(String::New("buffer"), String::New(native_buffer));
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exports->Set(String::New("child_process"),String::New(native_child_process));
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exports->Set(String::New("dns"), String::New(native_dns));
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exports->Set(String::New("dns_cares"), String::New(native_dns_cares));
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exports->Set(String::New("events"), String::New(native_events));
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exports->Set(String::New("file"), String::New(native_file));
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exports->Set(String::New("fs"), String::New(native_fs));

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