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Original file line number | Diff line number | Diff line change |
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import { DefaultHttpCache as Cache } from '../http-cache'; | ||
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describe('DefaultHttpCache', () => { | ||
const createCacheWithInfinityTtl = () => { | ||
const cache = new Cache(); | ||
cache.ttl = Infinity; | ||
return cache; | ||
}; | ||
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it('should return the same singleton instance on every call', () => { | ||
expect(Cache.shared).toBeInstanceOf(Cache); | ||
expect(Cache.shared).toEqual(Cache.shared); | ||
}); | ||
it('should serialize http payload to a string', () => { | ||
const cache = createCacheWithInfinityTtl(); | ||
const payload = { | ||
method: 'GET', | ||
headers: { hello: 'world' }, | ||
body: { hi: 'there' }, | ||
url: 'https://example.com', | ||
}; | ||
const key = cache.serializeCacheKey(payload); | ||
expect(typeof key).toBe('string'); | ||
expect(cache.serializeCacheKey(payload)).toEqual(key); | ||
expect( | ||
cache.serializeCacheKey({ | ||
...payload, | ||
url: 'https://example2.com', | ||
}), | ||
).not.toEqual(key); | ||
expect(cache.serializeCacheKey({ ...payload })).toEqual(key); | ||
}); | ||
it('should update ttl only if one is valid', () => { | ||
const cache = new Cache(); | ||
cache.ttl = 0; | ||
expect(cache.ttl).toBe(0); | ||
cache.ttl = Infinity; | ||
expect(cache.ttl).toBe(Infinity); | ||
cache.ttl = 10; | ||
expect(cache.ttl).toBe(10); | ||
cache.ttl = -1; | ||
expect(cache.ttl).toBe(10); | ||
cache.ttl = true as any; | ||
expect(cache.ttl).toBe(10); | ||
}); | ||
it('should insert new cache entries', () => { | ||
const cache = createCacheWithInfinityTtl(); | ||
expect(cache.set('key', 1).get('key')).toBe(1); | ||
expect(cache.set('key2', { hello: 'world' }).get('key2')).toStrictEqual({ hello: 'world' }); | ||
}); | ||
it('should delete cache entries', () => { | ||
const cache = createCacheWithInfinityTtl(); | ||
cache.set('key2', 2); | ||
expect(cache.set('key', 1).delete('key').get('key')).toBeNull(); | ||
expect(cache.get('key2')).toBe(2); | ||
}); | ||
it('should clear cache', () => { | ||
const cache = createCacheWithInfinityTtl(); | ||
cache.set('key', 1).set('key2', 2); | ||
expect(cache.size).toBe(2); | ||
cache.reset(); | ||
expect(cache.size).toBe(0); | ||
}); | ||
it('should delete cache entries after their expiration', (done) => { | ||
const cache = createCacheWithInfinityTtl(); | ||
cache.set('key', 1); | ||
cache.ttl = 0; | ||
cache.set('key2', 2); | ||
cache.ttl = 25; | ||
cache.set('key3', 3); | ||
cache.ttl = 100; | ||
cache.set('key4', 4); | ||
setTimeout(() => { | ||
expect(cache.get('key')).toBe(1); | ||
expect(cache.get('key2')).toBeNull(); | ||
expect(cache.get('key3')).toBeNull(); | ||
expect(cache.get('key4')).toBe(4); | ||
done(); | ||
}, 50); | ||
}); | ||
}); |
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Original file line number | Diff line number | Diff line change |
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import type { SerializeCacheKeyPayload } from './types'; | ||
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export abstract class HttpCache { | ||
/** | ||
* Получить данные из кеша | ||
* @param key - Уникальный ключ кеша | ||
* @example | ||
* ```ts | ||
* cache.get('key'); | ||
* ``` | ||
*/ | ||
public abstract get<T = any>(key: string): T | null; | ||
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/** | ||
* Добавить данные в кеш | ||
* @param key - Уникальный ключ кеша | ||
* @param data - Данные для добавления | ||
* @example | ||
* ```ts | ||
* cache.set('key', { ok: true }); | ||
* ``` | ||
*/ | ||
abstract set(key: string, data: any, ...rest: any): any; | ||
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/** | ||
* Удалить закешированные данные по ключу | ||
* @param key - Уникальный ключ кеша | ||
* @xample | ||
* ```ts | ||
* cache.delete('key'); | ||
* ``` | ||
*/ | ||
abstract delete(key: string): any; | ||
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/** | ||
* Полностью очистить кеш | ||
*/ | ||
abstract reset(): any; | ||
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/** | ||
* Сгенерировать уникальный ключ кеша из параметров http-запроса | ||
* @example | ||
* ```ts | ||
* cache.serializeCacheKey({ | ||
* url: 'https://example.com', | ||
* body: { key: "value" }, | ||
* method: "POST" | ||
* }) | ||
* ``` | ||
*/ | ||
public serializeCacheKey(payload: SerializeCacheKeyPayload): string { | ||
try { | ||
return JSON.stringify(payload); | ||
} catch (_e) { | ||
// на случай попытки сериализации объекта с циклическими зависимостями внутри | ||
return payload.url + String(Math.random()); | ||
} | ||
} | ||
} |
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Original file line number | Diff line number | Diff line change |
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@@ -0,0 +1,81 @@ | ||
import { HttpCache } from './abstract'; | ||
import type { HttpCacheEntry } from './types'; | ||
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const minute = 60000; | ||
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export class DefaultHttpCache extends HttpCache { | ||
private static sharedInstance: DefaultHttpCache; | ||
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private _map = new Map<string, HttpCacheEntry>(); | ||
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private _ttl = 10 * minute; | ||
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/** | ||
* Синглтон | ||
* @example | ||
* ```ts | ||
* cache.shared.get('key'); | ||
* ``` | ||
*/ | ||
public static get shared(): DefaultHttpCache { | ||
return DefaultHttpCache.sharedInstance || new DefaultHttpCache(); | ||
} | ||
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/** | ||
* Время жизни кеша в миллисекундах | ||
* @example | ||
* ```ts | ||
* cache.ttl = 60000; | ||
* cache.ttl = Infinity; | ||
* cache.tll = 0; | ||
* | ||
* // негативные значения игнорируются | ||
* cache.ttl = -1; | ||
* cache.ttl = Number.NEGATIVE_INFINITY; | ||
* ``` | ||
*/ | ||
public get ttl(): number { | ||
return this._ttl; | ||
} | ||
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public set ttl(ttl: number) { | ||
if (typeof ttl === 'number' && ttl >= 0) { | ||
this._ttl = ttl; | ||
} | ||
} | ||
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/** | ||
* Количество элементов в кеше | ||
*/ | ||
public get size(): number { | ||
return this._map.size; | ||
} | ||
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public get<T = any>(key: string) { | ||
const data = this._map.get(key); | ||
if (!data) return null; | ||
if (data.expires <= Date.now()) { | ||
this.delete(key); | ||
return null; | ||
} | ||
return data.data as T; | ||
} | ||
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public set(key: string, data: any): this { | ||
this._map.set(key, { | ||
data, | ||
expires: Date.now() + this.ttl, | ||
}); | ||
return this; | ||
} | ||
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public delete(key: string): this { | ||
this._map.delete(key); | ||
return this; | ||
} | ||
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public reset(): this { | ||
this._map.clear(); | ||
return this; | ||
} | ||
} |
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Original file line number | Diff line number | Diff line change |
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@@ -0,0 +1,2 @@ | ||
export { HttpCache } from './abstract'; | ||
export { DefaultHttpCache } from './default-cache'; |
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export interface HttpCacheEntry { | ||
data: any; | ||
expires: number; | ||
} | ||
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export interface SerializeCacheKeyPayload { | ||
headers?: Record<string, string>; | ||
method?: string; | ||
url: string; | ||
body?: Record<string, any>; | ||
} |
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Original file line number | Diff line number | Diff line change |
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|
@@ -44,3 +44,4 @@ export { | |
DaDataFioSuggestion, | ||
DaDataGender, | ||
}; | ||
export { HttpCache } from './http-cache'; |
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