69 lines
2.6 KiB
TypeScript
69 lines
2.6 KiB
TypeScript
// eslint-disable-next-line import/no-named-as-default
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import KeyvSqlite from '@keyv/sqlite';
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import { Cacheable, CacheableMemory, Keyv } from 'cacheable';
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import winston from 'winston';
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import { Context, Meta, UrlResult } from '../types';
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import { getCacheDir, isExtractorDisabled, noCache } from '../utils';
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import { Extractor } from './Extractor';
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export class ExtractorRegistry {
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private readonly logger: winston.Logger;
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private readonly extractors: Extractor[];
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private readonly urlResultCache: Cacheable;
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public constructor(logger: winston.Logger, extractors: Extractor[]) {
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this.logger = logger;
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this.extractors = extractors;
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this.urlResultCache = new Cacheable({
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primary: new Keyv({ store: new CacheableMemory({ lruSize: 1024 }) }),
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secondary: new Keyv(new KeyvSqlite(`sqlite://${getCacheDir()}/webstreamr-extractor-cache.sqlite`)),
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stats: true,
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});
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}
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public stats() {
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return {
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urlResultCache: this.urlResultCache.stats,
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};
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};
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public async handle(ctx: Context, url: URL, meta?: Meta): Promise<UrlResult[]> {
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const extractor = this.extractors.find(extractor => !isExtractorDisabled(ctx.config, extractor) && extractor.supports(ctx, url));
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if (!extractor) {
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return [];
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}
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const normalizedUrl = extractor.normalize(url);
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const cacheKey = extractor.viaMediaFlowProxy
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? `${extractor.id}_${normalizedUrl}_${ctx.config.mediaFlowProxyUrl}`
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: `${extractor.id}_${normalizedUrl}`;
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const storedDataRaw = await this.urlResultCache.getRaw<UrlResult[]>(cacheKey);
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const expires = storedDataRaw?.expires;
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if (storedDataRaw && expires && !noCache(ctx.config)) {
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// Ignore the cache randomly after at least 2/3 of the TTL passed to start refreshing results slowly
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const refreshTimestamp = this.randomInteger(expires - extractor.ttl * (2 / 3), expires);
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const now = Date.now();
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/* istanbul ignore if */
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if (refreshTimestamp > now) {
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return (storedDataRaw.value as UrlResult[]).map(urlResult => ({ ...urlResult, ttl: expires - now, url: new URL(urlResult.url) }));
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}
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}
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this.logger.info(`Extract ${url} using ${extractor.id} extractor`, ctx);
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const urlResults = await extractor.extract(ctx, normalizedUrl, { ...meta, countryCodes: meta?.countryCodes ?? [] });
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if (!urlResults.some(urlResult => urlResult.error) && extractor.ttl) {
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await this.urlResultCache.set<UrlResult[]>(cacheKey, urlResults, extractor.ttl);
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}
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return urlResults;
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};
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private randomInteger(min: number, max: number) {
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return Math.floor(Math.random() * (max - min + 1)) + min;
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}
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}
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