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Текущая директория: /usr/lib/node_modules/bitgo/node_modules/viem/_esm/utils/promise
Просмотр файла: withCache.js
/** @internal */
export const promiseCache = /*#__PURE__*/ new Map();
/** @internal */
export const responseCache = /*#__PURE__*/ new Map();
export function getCache(cacheKey) {
const buildCache = (cacheKey, cache) => ({
clear: () => cache.delete(cacheKey),
get: () => cache.get(cacheKey),
set: (data) => cache.set(cacheKey, data),
});
const promise = buildCache(cacheKey, promiseCache);
const response = buildCache(cacheKey, responseCache);
return {
clear: () => {
promise.clear();
response.clear();
},
promise,
response,
};
}
/**
* @description Returns the result of a given promise, and caches the result for
* subsequent invocations against a provided cache key.
*/
export async function withCache(fn, { cacheKey, cacheTime = Number.POSITIVE_INFINITY }) {
const cache = getCache(cacheKey);
// If a response exists in the cache, and it's not expired, return it
// and do not invoke the promise.
// If the max age is 0, the cache is disabled.
const response = cache.response.get();
if (response && cacheTime > 0) {
const age = Date.now() - response.created.getTime();
if (age < cacheTime)
return response.data;
}
let promise = cache.promise.get();
if (!promise) {
promise = fn();
// Store the promise in the cache so that subsequent invocations
// will wait for the same promise to resolve (deduping).
cache.promise.set(promise);
}
try {
const data = await promise;
// Store the response in the cache so that subsequent invocations
// will return the same response.
cache.response.set({ created: new Date(), data });
return data;
}
finally {
// Clear the promise cache so that subsequent invocations will
// invoke the promise again.
cache.promise.clear();
}
}
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