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| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 | 22x 7x 7x 26x 26x 26x 26x 8x 18x 18x 18x 18x 18x 18x 2x 2x 18x 4x 4x 4x 4x 4x 4x 18x 7x 7x | export interface AsyncMemoizeOptions<
T extends (...args: any[]) => Promise<any>,
> {
/**
* 缓存键。
*
* @default arg0 => arg0
*/
cacheKey?: (...args: Parameters<T>) => any
/**
* 缓存时效（毫秒）。
*
* - `0` 表示永久缓存，直到手动清除或发生错误。
* - `while-pending` 或 `-1` 表示仅在异步操作未完成前缓存，完成后失效。
* - `数字` 表示具体的缓存时长（毫秒）。
* - `函数形式` 可根据结果和参数动态设置时效。
*
* @default 0
*/
cacheTTL?:
| 'while-pending'
| number
| ((
result: Awaited<ReturnType<T>>,
...args: Parameters<T>
) => number | void)
}
export type AsyncMemoizeCacheMap = Map<
string,
{
value: any
expiredAt: number
}
>
/**
* 异步函数执行缓存。
*
* @param asyncFn 异步函数
* @param options 选项
*/
export function asyncMemoize<T extends (...args: any[]) => Promise<any>>(
asyncFn: T,
options: AsyncMemoizeOptions<T> = {},
): T & {
cache: AsyncMemoizeCacheMap
} {
const { cacheKey = (...args: any[]) => args[0], cacheTTL } = options
const cache: AsyncMemoizeCacheMap = new Map()
const call = (...args: any[]) => {
const _cacheKey = cacheKey(...args)
const cacheValue = cache.get(_cacheKey)
const currentMs = Date.now()
if (
cacheValue &&
(cacheValue.expiredAt === 0 || currentMs < cacheValue.expiredAt)
) {
return cacheValue.value
}
const cacheValueNew = asyncFn(...args)
cacheValueNew.catch(() => cache.delete(_cacheKey))
const cacheTTLIsFunction = typeof cacheTTL === 'function'
const cacheTTLIsWhilePending =
cacheTTL === 'while-pending' || cacheTTL === -1
cache.set(_cacheKey, {
value: cacheValueNew,
expiredAt: cacheTTLIsFunction
? 0
: !cacheTTL || cacheTTLIsWhilePending
? 0
: currentMs + cacheTTL,
})
if (cacheTTLIsWhilePending) {
cacheValueNew.then(() => {
cache.delete(_cacheKey)
})
}
if (cacheTTLIsFunction) {
cacheValueNew.then(result => {
const ttl = cacheTTL(result, ...(args as any))
const expiredAt = ttl ? Date.now() + ttl : 0
const cached = cache.get(_cacheKey)
if (cached) {
cached.expiredAt = expiredAt
}
})
}
return cacheValueNew
}
call.cache = cache
return call as any
}
|