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117 lines
3.6 KiB
117 lines
3.6 KiB
3 years ago
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"use strict";
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Object.defineProperty(exports, "__esModule", { value: true });
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exports.SrvPoller = exports.SrvPollingEvent = void 0;
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const dns = require("dns");
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const timers_1 = require("timers");
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const error_1 = require("../error");
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const mongo_types_1 = require("../mongo_types");
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const utils_1 = require("../utils");
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/**
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* Determines whether a provided address matches the provided parent domain in order
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* to avoid certain attack vectors.
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*
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* @param srvAddress - The address to check against a domain
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* @param parentDomain - The domain to check the provided address against
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* @returns Whether the provided address matches the parent domain
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*/
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function matchesParentDomain(srvAddress, parentDomain) {
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const regex = /^.*?\./;
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const srv = `.${srvAddress.replace(regex, '')}`;
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const parent = `.${parentDomain.replace(regex, '')}`;
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return srv.endsWith(parent);
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}
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/**
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* @internal
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* @category Event
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*/
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class SrvPollingEvent {
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constructor(srvRecords) {
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this.srvRecords = srvRecords;
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}
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hostnames() {
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return new Set(this.srvRecords.map(r => utils_1.HostAddress.fromSrvRecord(r).toString()));
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}
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}
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exports.SrvPollingEvent = SrvPollingEvent;
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/** @internal */
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class SrvPoller extends mongo_types_1.TypedEventEmitter {
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constructor(options) {
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super();
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if (!options || !options.srvHost) {
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throw new error_1.MongoRuntimeError('Options for SrvPoller must exist and include srvHost');
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}
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this.srvHost = options.srvHost;
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this.srvMaxHosts = options.srvMaxHosts ?? 0;
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this.srvServiceName = options.srvServiceName ?? 'mongodb';
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this.rescanSrvIntervalMS = 60000;
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this.heartbeatFrequencyMS = options.heartbeatFrequencyMS ?? 10000;
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this.haMode = false;
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this.generation = 0;
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this._timeout = undefined;
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}
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get srvAddress() {
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return `_${this.srvServiceName}._tcp.${this.srvHost}`;
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}
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get intervalMS() {
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return this.haMode ? this.heartbeatFrequencyMS : this.rescanSrvIntervalMS;
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}
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start() {
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if (!this._timeout) {
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this.schedule();
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}
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}
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stop() {
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if (this._timeout) {
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(0, timers_1.clearTimeout)(this._timeout);
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this.generation += 1;
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this._timeout = undefined;
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}
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}
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// TODO(NODE-4994): implement new logging logic for SrvPoller failures
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schedule() {
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if (this._timeout) {
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(0, timers_1.clearTimeout)(this._timeout);
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}
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this._timeout = (0, timers_1.setTimeout)(() => {
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this._poll().catch(() => null);
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}, this.intervalMS);
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}
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success(srvRecords) {
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this.haMode = false;
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this.schedule();
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this.emit(SrvPoller.SRV_RECORD_DISCOVERY, new SrvPollingEvent(srvRecords));
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}
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failure() {
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this.haMode = true;
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this.schedule();
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}
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async _poll() {
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const generation = this.generation;
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let srvRecords;
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try {
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srvRecords = await dns.promises.resolveSrv(this.srvAddress);
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}
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catch (dnsError) {
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this.failure();
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return;
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}
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if (generation !== this.generation) {
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return;
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}
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const finalAddresses = [];
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for (const record of srvRecords) {
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if (matchesParentDomain(record.name, this.srvHost)) {
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finalAddresses.push(record);
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}
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}
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if (!finalAddresses.length) {
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this.failure();
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return;
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}
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this.success(finalAddresses);
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}
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}
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exports.SrvPoller = SrvPoller;
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/** @event */
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SrvPoller.SRV_RECORD_DISCOVERY = 'srvRecordDiscovery';
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//# sourceMappingURL=srv_polling.js.map
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