73 lines
1.8 KiB
TypeScript
73 lines
1.8 KiB
TypeScript
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import { CachedZone, DNSRecord, DNSZone, SOARecord } from "../models/interfaces";
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import { readZoneFile } from "./reader";
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import { DNSRecordType } from "./records";
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import { writeZoneFile } from "./writer";
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export class DNSCache {
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private cached: Record<string, CachedZone> = {};
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constructor(private ttl = 1600) {}
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has(name: string): boolean {
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return this.cached[name] != null;
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}
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async get(name: string): Promise<CachedZone | null> {
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const cached = this.cached[name];
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if (!cached) {
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return null;
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}
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if (cached.changed.getTime() < new Date().getTime() - this.ttl * 1000) {
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return this.load(name, cached.file);
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}
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return this.cached[name];
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}
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async set(name: string, zone: CachedZone): Promise<void> {
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this.cached[name] = zone;
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}
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async load(name: string, file: string): Promise<CachedZone> {
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const zoneFile = await readZoneFile(file);
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const cache = {
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name,
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file,
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zone: zoneFile,
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added: new Date(),
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changed: new Date()
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}
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this.cached[name] = cache;
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return cache;
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}
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async save(name: string): Promise<void> {
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const zone = await this.get(name);
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if (!zone) {
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throw new Error('No such cached zone file!');
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}
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await writeZoneFile(zone.zone, zone.file);
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}
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async update(name: string, newZone?: CachedZone): Promise<void> {
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let zone: CachedZone | null;
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if (newZone) {
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zone = newZone;
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} else {
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zone = await this.get(name);
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}
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if (!zone) {
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throw new Error('No such cached zone file!');
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}
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zone.changed = new Date();
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const soa = zone.zone.records.find((record) => record.type === DNSRecordType.SOA) as SOARecord;
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soa.serial = Math.floor(Date.now() / 1000);
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this.set(name, zone);
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return this.save(name);
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}
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}
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