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import { clearTimeout, setTimeout } from 'timers';
import { MongoRuntimeError } from '../error';
import { TypedEventEmitter } from '../mongo_types';
import { checkParentDomainMatch, HostAddress, noop, squashError } from '../utils';
/**
* @internal
* @category Event
*/
export class SrvPollingEvent {
srvRecords: dns.SrvRecord[];
constructor(srvRecords: dns.SrvRecord[]) {
this.srvRecords = srvRecords;
}
hostnames(): Set<string> {
return new Set(this.srvRecords.map(r => HostAddress.fromSrvRecord(r).toString()));
}
}
/** @internal */
export interface SrvPollerOptions {
srvServiceName: string;
srvMaxHosts: number;
srvHost: string;
heartbeatFrequencyMS: number;
}
/** @internal */
export type SrvPollerEvents = {
srvRecordDiscovery(event: SrvPollingEvent): void;
};
/** @internal */
export class SrvPoller extends TypedEventEmitter<SrvPollerEvents> {
srvHost: string;
rescanSrvIntervalMS: number;
heartbeatFrequencyMS: number;
haMode: boolean;
generation: number;
srvMaxHosts: number;
srvServiceName: string;
_timeout?: NodeJS.Timeout;
/** @event */
static readonly SRV_RECORD_DISCOVERY = 'srvRecordDiscovery' as const;
constructor(options: SrvPollerOptions) {
super();
this.on('error', noop);
if (!options || !options.srvHost) {
throw new MongoRuntimeError('Options for SrvPoller must exist and include srvHost');
}
this.srvHost = options.srvHost;
this.srvMaxHosts = options.srvMaxHosts ?? 0;
this.srvServiceName = options.srvServiceName ?? 'mongodb';
this.rescanSrvIntervalMS = 60000;
this.heartbeatFrequencyMS = options.heartbeatFrequencyMS ?? 10000;
this.haMode = false;
this.generation = 0;
this._timeout = undefined;
}
get srvAddress(): string {
return `_${this.srvServiceName}._tcp.${this.srvHost}`;
}
get intervalMS(): number {
return this.haMode ? this.heartbeatFrequencyMS : this.rescanSrvIntervalMS;
}
start(): void {
Eif (!this._timeout) {
this.schedule();
}
}
stop(): void {
if (this._timeout) {
clearTimeout(this._timeout);
this.generation += 1;
this._timeout = undefined;
}
}
// TODO(NODE-4994): implement new logging logic for SrvPoller failures
schedule(): void {
if (this._timeout) {
clearTimeout(this._timeout);
}
this._timeout = setTimeout(() => {
this._poll().then(undefined, squashError);
}, this.intervalMS);
}
success(srvRecords: dns.SrvRecord[]): void {
this.haMode = false;
this.schedule();
this.emit(SrvPoller.SRV_RECORD_DISCOVERY, new SrvPollingEvent(srvRecords));
}
failure(): void {
this.haMode = true;
this.schedule();
}
async _poll(): Promise<void> {
const generation = this.generation;
let srvRecords;
try {
srvRecords = await dns.promises.resolveSrv(this.srvAddress);
} catch {
this.failure();
return;
}
if (generation !== this.generation) {
return;
}
const finalAddresses: dns.SrvRecord[] = [];
for (const record of srvRecords) {
try {
checkParentDomainMatch(record.name, this.srvHost);
finalAddresses.push(record);
} catch (error) {
squashError(error);
}
}
if (!finalAddresses.length) {
this.failure();
return;
}
this.success(finalAddresses);
}
}
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