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* Hybrid Cache Utility
*
* Uses Redis when available, falls back to in-memory cache.
* Provides a unified API for caching operations.
*/
import { logger } from '@/lib/logging';
import { redisGet, redisSet, redisDel, redisKeys, isRedisAvailable, CACHE_TTL } from '@/lib/integrations';
// Re-export CACHE_TTL for convenience
export { CACHE_TTL };
interface CacheEntry<T> {
data: T;
timestamp: number;
ttl: number;
}
// Cache statistics tracking
interface CacheStatistics {
hits: number;
misses: number;
}
// Use globalThis to persist cache across hot reloads in development
const globalForCache = globalThis as unknown as {
memoryCache: Map<string, CacheEntry<unknown>>;
cacheStats: CacheStatistics;
};
// Initialize cache map (persists across hot reloads in dev)
if (!globalForCache.memoryCache) {
globalForCache.memoryCache = new Map<string, CacheEntry<unknown>>();
}
// Initialize stats (persists across hot reloads in dev)
if (!globalForCache.cacheStats) {
globalForCache.cacheStats = { hits: 0, misses: 0 };
}
const memoryCache = globalForCache.memoryCache;
const cacheStats = globalForCache.cacheStats;
/**
* Clear all memory cache entries (useful for tests)
*/
export function clearMemoryCache(): void {
memoryCache.clear();
}
// Cache key generators
export const CACHE_KEYS = {
categories: () => 'categories:all',
categoryProducts: (id: number) => `categories:${id}:products`,
product: (id: number) => `products:${id}`,
productList: (params: string) => `products:list:${params}`,
filters: () => 'products:filters',
search: (query: string) => `search:${query}`,
};
/**
* Get cached data from Redis or memory cache
* @param key Cache key
* @returns Cached data or null if not found/expired
*/
export async function getCached<T>(key: string): Promise<T | null> {
// Try Redis first
if (await isRedisAvailable()) {
const data = await redisGet<T>(key);
if (data !== null) {
cacheStats.hits++;
logger.debug(`Redis hit for ${key}`, { category: 'CACHE' });
return data;
}
cacheStats.misses++;
logger.debug(`Redis miss for ${key}`, { category: 'CACHE' });
return null;
}
// Fall back to memory cache
const entry = memoryCache.get(key) as CacheEntry<T> | undefined;
if (!entry) {
cacheStats.misses++;
logger.debug(`Memory miss for ${key}`, { category: 'CACHE' });
return null;
}
const now = Date.now();
if (now - entry.timestamp > entry.ttl) {
memoryCache.delete(key);
cacheStats.misses++;
logger.debug(`Memory expired for ${key}`, { category: 'CACHE' });
return null;
}
cacheStats.hits++;
logger.debug(`Memory hit for ${key}`, { category: 'CACHE' });
return entry.data;
}
/**
* Synchronous version for memory-only cache access
* @param key Cache key
* @returns Cached data or null if not found/expired
*/
export function getCachedSync<T>(key: string): T | null {
const entry = memoryCache.get(key) as CacheEntry<T> | undefined;
if (!entry) return null;
const now = Date.now();
if (now - entry.timestamp > entry.ttl) {
memoryCache.delete(key);
return null;
}
return entry.data;
}
/**
* Set data in cache (Redis + memory)
* @param key Cache key
* @param data Data to cache
* @param ttlSeconds Time to live in seconds (default: 5 minutes)
*/
export async function setCached<T>(
key: string,
data: T,
ttlSeconds: number = 300
): Promise<void> {
// Set in Redis if available
if (await isRedisAvailable()) {
await redisSet(key, data, ttlSeconds);
}
// Also set in memory cache
memoryCache.set(key, {
data,
timestamp: Date.now(),
ttl: ttlSeconds * 1000, // Convert to milliseconds for memory cache
});
}
/**
* Synchronous version for memory-only cache write
* @param key Cache key
* @param data Data to cache
* @param ttlMs Time to live in milliseconds (default: 5 minutes)
*/
export function setCachedSync<T>(
key: string,
data: T,
ttlMs: number = 5 * 60 * 1000
): void {
memoryCache.set(key, {
data,
timestamp: Date.now(),
ttl: ttlMs});
}
/**
* Clear cached data
* @param key Optional cache key to clear. If not provided, clears all cache
*/
export async function clearCache(key?: string): Promise<void> {
if (key) {
if (await isRedisAvailable()) {
await redisDel(key);
}
memoryCache.delete(key);
} else {
// Clear pattern in Redis
if (await isRedisAvailable()) {
const keys = await redisKeys('*');
if (keys.length > 0) {
await redisDel(...keys);
}
}
memoryCache.clear();
}
}
/**
* Invalidate cache entries matching a pattern
* @param pattern Pattern to match (e.g., 'products:*')
*/
export async function invalidatePattern(pattern: string): Promise<void> {
// Invalidate in Redis
if (await isRedisAvailable()) {
const keys = await redisKeys(pattern);
if (keys.length > 0) {
await redisDel(...keys);
logger.debug(`Invalidated ${keys.length} Redis keys matching ${pattern}`, { category: 'CACHE' });
}
}
// Invalidate in memory cache
const regex = new RegExp('^' + pattern.replace(/\*/g, '.*') + '$');
let removed = 0;
for (const key of memoryCache.keys()) {
if (regex.test(key)) {
memoryCache.delete(key);
removed++;
}
}
if (removed > 0) {
logger.debug(`Invalidated ${removed} memory cache keys matching ${pattern}`, { category: 'CACHE' });
}
}
/**
* Get or set cache with fetcher function
* @param key Cache key
* @param fetcher Function to fetch data if not cached
* @param ttlSeconds Time to live in seconds
* @returns Cached or fetched data
*/
export async function getOrSet<T>(
key: string,
fetcher: () => Promise<T>,
ttlSeconds: number
): Promise<T> {
// Try cache first
const cached = await getCached<T>(key);
if (cached !== null) {
return cached;
}
// Fetch and cache
const data = await fetcher();
await setCached(key, data, ttlSeconds);
return data;
}
/**
* Get cache statistics
* @returns Object with cache size, keys, hits, and misses
*/
export function getCacheStats(): {
size: number;
keys: string[];
hits: number;
misses: number;
hitRate: number;
} {
const total = cacheStats.hits + cacheStats.misses;
return {
size: memoryCache.size,
keys: Array.from(memoryCache.keys()),
hits: cacheStats.hits,
misses: cacheStats.misses,
hitRate: total > 0 ? cacheStats.hits / total : 0,
};
}
/**
* Cleanup expired entries in memory cache
* Call this periodically to prevent memory leaks
* @returns Number of entries removed
*/
export function cleanupExpiredEntries(): number {
const now = Date.now();
let removed = 0;
for (const [key, entry] of memoryCache.entries()) {
if (now - entry.timestamp > entry.ttl) {
memoryCache.delete(key);
removed++;
}
}
return removed;
}
// Auto-cleanup expired entries every hour
if (typeof window === 'undefined' && process.env.NODE_ENV !== 'test') {
// Only run cleanup on server-side (not in tests)
const cleanupTimer = setInterval(() => {
const removed = cleanupExpiredEntries();
if (removed > 0) {
logger.debug(`Cleaned up ${removed} expired memory entries`, { category: 'CACHE' });
}
}, 60 * 60 * 1000); // 1 hour
// Unref to not prevent process exit
cleanupTimer.unref();
}
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