76 lines
1.9 KiB
JavaScript
76 lines
1.9 KiB
JavaScript
// Copyright (c) 2026 Gordon Bolton. MIT License.
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const { logToFile } = require('./logger');
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class MemoryCache {
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constructor() {
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this.store = new Map();
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}
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get(key) {
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const entry = this.store.get(key);
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if (!entry) return null;
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if (Date.now() > entry.expiresAt) {
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this.store.delete(key);
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return null;
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}
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return entry.value;
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}
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set(key, value, ttlMs) {
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this.store.set(key, {
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value,
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expiresAt: Date.now() + ttlMs
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});
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}
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invalidate(key) {
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this.store.delete(key);
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}
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clear() {
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this.store.clear();
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}
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getStats() {
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const now = Date.now();
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const entries = [];
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let totalSize = 0;
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for (const [key, entry] of this.store.entries()) {
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// Maps must be converted before JSON.stringify (which renders them as "{}")
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const serializable = entry.value instanceof Map ? Object.fromEntries(entry.value) : entry.value;
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const json = JSON.stringify(serializable);
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const sizeBytes = Buffer.byteLength(json, 'utf8');
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totalSize += sizeBytes;
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const ttlRemaining = Math.max(0, entry.expiresAt - now);
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const expired = now > entry.expiresAt;
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let itemCount = null;
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if (entry.value instanceof Map) {
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itemCount = entry.value.size;
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} else if (Array.isArray(entry.value)) {
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itemCount = entry.value.length;
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} else if (entry.value && typeof entry.value === 'object') {
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if (Array.isArray(entry.value.records)) itemCount = entry.value.records.length;
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else if (Array.isArray(entry.value.slots)) itemCount = entry.value.slots.length;
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}
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entries.push({
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key,
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sizeBytes,
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itemCount,
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ttlRemainingMs: ttlRemaining,
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expired
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});
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}
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return {
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entryCount: this.store.size,
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totalSizeBytes: totalSize,
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entries
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};
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}
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}
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const cache = new MemoryCache();
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module.exports = cache;
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