mirror of https://github.com/buster-so/buster.git
107 lines
2.2 KiB
TypeScript
107 lines
2.2 KiB
TypeScript
import { LRUCache } from 'lru-cache';
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import { canUserAccessChat } from './chats';
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// Cache configuration
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const cache = new LRUCache<string, boolean>({
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max: 10000, // Maximum 10k entries
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ttl: 30 * 1000, // 30 seconds
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updateAgeOnGet: true, // Refresh TTL on access
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});
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// Metrics
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let cacheHits = 0;
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let cacheMisses = 0;
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/**
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* Cached version of canUserAccessChat
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* Caches the boolean result for userId:chatId for 30 seconds
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* TTL is refreshed on each access
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*/
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export async function canUserAccessChatCached({
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userId,
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chatId,
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}: {
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userId: string;
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chatId: string;
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}): Promise<boolean> {
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const cacheKey = `${userId}:${chatId}`;
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// Check cache
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const cached = cache.get(cacheKey);
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if (cached !== undefined) {
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cacheHits++;
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return cached;
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}
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// Cache miss - call the original function
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cacheMisses++;
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const hasAccess = await canUserAccessChat({ userId, chatId });
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// Store the boolean result
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cache.set(cacheKey, hasAccess);
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return hasAccess;
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}
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/**
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* Get cache statistics
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*/
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export function getCacheStats() {
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const total = cacheHits + cacheMisses;
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const hitRate = total > 0 ? (cacheHits / total) * 100 : 0;
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return {
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hits: cacheHits,
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misses: cacheMisses,
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total,
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hitRate: `${hitRate.toFixed(2)}%`,
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size: cache.size,
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maxSize: cache.max,
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};
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}
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/**
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* Clear cache statistics (useful for testing)
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*/
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export function resetCacheStats() {
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cacheHits = 0;
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cacheMisses = 0;
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}
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/**
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* Clear the entire cache (useful for testing)
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*/
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export function clearCache() {
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cache.clear();
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}
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/**
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* Invalidate a specific user:chat combination
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*/
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export function invalidateAccess(userId: string, chatId: string) {
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const cacheKey = `${userId}:${chatId}`;
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cache.delete(cacheKey);
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}
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/**
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* Invalidate all cached entries for a specific user
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*/
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export function invalidateUserAccess(userId: string) {
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for (const key of Array.from(cache.keys())) {
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if (key.startsWith(`${userId}:`)) {
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cache.delete(key);
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}
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}
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}
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/**
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* Invalidate all cached entries for a specific chat
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*/
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export function invalidateChatAccess(chatId: string) {
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for (const key of Array.from(cache.keys())) {
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if (key.endsWith(`:${chatId}`)) {
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cache.delete(key);
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}
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}
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}
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