86 lines
2.0 KiB
JavaScript
86 lines
2.0 KiB
JavaScript
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export const createRealpathCache = ({
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realpath,
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successTtlMs = 600_000,
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failureTtlMs = 60_000,
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maxEntries = 256,
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fallbackOnError = false,
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now = () => Date.now(),
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} = {}) => {
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const cache = new Map();
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const resolveRealpath = typeof realpath === 'function' ? realpath : null;
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const prune = () => {
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while (cache.size > maxEntries) {
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const oldestKey = cache.keys().next().value;
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if (oldestKey === undefined) {
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return;
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}
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cache.delete(oldestKey);
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}
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};
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const remember = (key, entry, ttlMs) => {
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if (!Number.isFinite(maxEntries) || maxEntries <= 0) {
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return;
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}
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cache.delete(key);
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cache.set(key, { ...entry, expiresAt: now() + Math.max(0, ttlMs) });
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prune();
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};
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const resolve = async (value) => {
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if (typeof value !== 'string' || value.length === 0 || !resolveRealpath) {
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return value;
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}
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const cached = cache.get(value);
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const currentTime = now();
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if (cached?.promise) {
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return cached.promise;
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}
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if (cached && cached.expiresAt > currentTime) {
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cache.delete(value);
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cache.set(value, cached);
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if (cached.error) {
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if (fallbackOnError) {
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return value;
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}
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throw cached.error;
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}
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return cached.value;
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}
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if (cached) {
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cache.delete(value);
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}
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const promise = Promise.resolve()
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.then(() => resolveRealpath(value))
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.then((resolved) => {
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const next = typeof resolved === 'string' && resolved.length > 0 ? resolved : value;
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remember(value, { value: next }, successTtlMs);
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return next;
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})
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.catch((error) => {
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remember(value, { value, error }, failureTtlMs);
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if (!fallbackOnError) {
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throw error;
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}
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return value;
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});
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if (Number.isFinite(maxEntries) && maxEntries > 0) {
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cache.delete(value);
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cache.set(value, { value, expiresAt: 0, promise });
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prune();
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}
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return promise;
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};
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return {
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resolve,
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clear: () => cache.clear(),
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size: () => cache.size,
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};
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};
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