90 lines
3.0 KiB
JavaScript
90 lines
3.0 KiB
JavaScript
/* jslint node:true */
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'use strict';
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exports = module.exports = waitForDns;
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var assert = require('assert'),
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async = require('async'),
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attempt = require('attempt'),
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debug = require('debug')('box:src/waitfordns'),
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dns = require('native-dns');
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// the first arg to callback is not an error argument; this is required for async.every
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function isChangeSynced(domain, ip, nameserver, callback) {
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assert.strictEqual(typeof domain, 'string');
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assert.strictEqual(typeof ip, 'string');
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assert.strictEqual(typeof nameserver, 'string');
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assert.strictEqual(typeof callback, 'function');
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// ns records cannot have cname
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dns.resolve4(nameserver, function (error, nsIps) {
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if (error || !nsIps || nsIps.length === 0) return callback(false);
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async.every(nsIps, function (nsIp, iteratorCallback) {
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var req = dns.Request({
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question: dns.Question({ name: domain, type: 'A' }),
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server: { address: nsIp },
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timeout: 5000
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});
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req.on('timeout', function () { return iteratorCallback(false); });
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req.on('message', function (error, message) {
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if (error || !message.answer || message.answer.length === 0) return iteratorCallback(false);
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debug('isChangeSynced: ns: %s (%s), name:%s Actual:%j Expecting:%s', nameserver, nsIp, domain, message.answer[0], ip);
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if (message.answer[0].address !== ip) return iteratorCallback(false);
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iteratorCallback(true); // done
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});
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req.send();
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}, callback);
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});
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}
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// check if IP change has propagated to every nameserver
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function waitForDns(domain, ip, zoneName, options, callback) {
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assert.strictEqual(typeof domain, 'string');
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assert.strictEqual(typeof ip, 'string');
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assert.strictEqual(typeof zoneName, 'string');
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var defaultOptions = {
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retryInterval: 5000,
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retries: Infinity
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};
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if (typeof options === 'function') {
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callback = options;
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options = defaultOptions;
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} else {
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assert.strictEqual(typeof options, 'object');
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assert.strictEqual(typeof callback, 'function');
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}
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debug('waitForDNS: domain %s to be %s in zone %s.', domain, ip, zoneName);
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attempt(function (attempts) {
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var callback = this; // gross
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debug('waitForDNS: %s attempt %s.', domain, attempts);
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dns.resolveNs(zoneName, function (error, nameservers) {
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if (error || !nameservers) return callback(error || new Error('Unable to get nameservers'));
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async.every(nameservers, isChangeSynced.bind(null, domain, ip), function (synced) {
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debug('waitForDNS: %s %s ns: %j', domain, synced ? 'done' : 'not done', nameservers);
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callback(synced ? null : new Error('ETRYAGAIN'));
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});
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});
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}, { interval: options.retryInterval, retries: options.retries }, function (error) {
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if (error) return callback(error);
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debug('waitForDNS: %s done.', domain);
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callback(null);
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});
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}
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