Christopher Schleiden
44 lines
1.1 KiB
TypeScript
44 lines
1.1 KiB
TypeScript
// From https://github.com/cschleiden/github-actions-parser/blob/a81dec9b7462dbcff08fbad0792f5ad549d9de7d/src/lib/workflowschema/workflowSchema.ts
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interface CacheEntry<T> {
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cachedAt: number;
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content: T;
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}
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export class TTLCache {
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private cache = new Map<string, CacheEntry<unknown>>();
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constructor(private defaultTTLinMS: number = 10 * 60 * 1000) {}
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/**
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*
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* @param key Key to cache value under
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* @param ttlInMS How long is the content valid. If optional, default value will be used
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* @param getter Function to retrieve content if not in cache
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*/
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async get<T>(key: string, ttlInMS: number | undefined, getter: () => Promise<T>): Promise<T> {
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const hasEntry = this.cache.has(key);
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const e = hasEntry && this.cache.get(key);
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if (hasEntry && e && e.cachedAt > Date.now() - (ttlInMS || this.defaultTTLinMS)) {
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return e.content as T;
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}
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try {
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const content = await getter();
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this.cache.set(key, {
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cachedAt: Date.now(),
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content
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});
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return content;
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} catch (e) {
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this.cache.delete(key);
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throw e;
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}
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}
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clear(): void {
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this.cache.clear();
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}
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}
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