mirror of
https://github.com/kjanat/livedash-node.git
synced 2026-01-16 15:32:10 +01:00
feat: implement cache layer, CSP improvements, and database performance optimizations
- Add Redis cache implementation with LRU eviction - Enhance Content Security Policy with nonce generation - Optimize database queries with connection pooling - Add cache invalidation API endpoints - Improve security monitoring performance
This commit is contained in:
475
lib/cache.ts
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475
lib/cache.ts
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@ -0,0 +1,475 @@
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/**
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* Comprehensive Caching Layer with Redis + In-Memory Fallback
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*
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* This module provides a unified caching interface that:
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* - Uses Redis when available for distributed caching
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* - Falls back to in-memory LRU cache when Redis is unavailable
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* - Provides type-safe caching with automatic serialization/deserialization
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* - Includes cache warming, invalidation patterns, and monitoring
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*/
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import { env } from "./env";
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import { redisManager } from "./redis";
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interface CacheEntry<T> {
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value: T;
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expiresAt: number;
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createdAt: number;
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}
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class MemoryCache {
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private cache = new Map<string, CacheEntry<unknown>>();
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private maxSize = 1000;
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private cleanupInterval: NodeJS.Timeout;
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constructor() {
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// Clean up expired entries every 5 minutes
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this.cleanupInterval = setInterval(() => this.cleanup(), 5 * 60 * 1000);
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}
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set<T>(key: string, value: T, ttlSeconds: number): void {
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// If cache is full, remove oldest entries
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if (this.cache.size >= this.maxSize) {
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const oldestKey = this.cache.keys().next().value;
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if (oldestKey) {
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this.cache.delete(oldestKey);
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}
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}
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const now = Date.now();
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this.cache.set(key, {
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value,
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expiresAt: now + ttlSeconds * 1000,
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createdAt: now,
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});
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}
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get<T>(key: string): T | null {
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const entry = this.cache.get(key) as CacheEntry<T> | undefined;
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if (!entry) return null;
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if (Date.now() > entry.expiresAt) {
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this.cache.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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delete(key: string): boolean {
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return this.cache.delete(key);
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}
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clear(): void {
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this.cache.clear();
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}
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private cleanup(): void {
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const now = Date.now();
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this.cache.forEach((entry, key) => {
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if (now > entry.expiresAt) {
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this.cache.delete(key);
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}
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});
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}
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getStats() {
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const now = Date.now();
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let expired = 0;
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let valid = 0;
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this.cache.forEach((entry) => {
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if (now > entry.expiresAt) {
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expired++;
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} else {
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valid++;
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}
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});
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return {
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size: this.cache.size,
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valid,
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expired,
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maxSize: this.maxSize,
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};
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}
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destroy(): void {
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if (this.cleanupInterval) {
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clearInterval(this.cleanupInterval);
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}
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this.cache.clear();
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}
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}
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class CacheManager {
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private memoryCache = new MemoryCache();
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private stats = {
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hits: 0,
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misses: 0,
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sets: 0,
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deletes: 0,
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errors: 0,
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redisHits: 0,
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memoryHits: 0,
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};
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async get<T>(key: string): Promise<T | null> {
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try {
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// Try Redis first
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if (redisManager.isAvailable()) {
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const redisValue = await redisManager.get(key);
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if (redisValue) {
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this.stats.hits++;
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this.stats.redisHits++;
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return JSON.parse(redisValue);
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}
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}
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// Fall back to memory cache
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const memoryValue = this.memoryCache.get<T>(key);
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if (memoryValue) {
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this.stats.hits++;
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this.stats.memoryHits++;
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return memoryValue;
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}
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this.stats.misses++;
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return null;
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} catch (error) {
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console.error(`[Cache] GET error for key ${key}:`, error);
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this.stats.errors++;
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return null;
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}
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}
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async set<T>(
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key: string,
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value: T,
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ttlSeconds: number = env.REDIS_TTL_DEFAULT
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): Promise<boolean> {
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try {
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const serializedValue = JSON.stringify(value);
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let redisSuccess = false;
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let memorySuccess = false;
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// Set in Redis if available
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if (redisManager.isAvailable()) {
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redisSuccess = await redisManager.set(key, serializedValue, {
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EX: ttlSeconds,
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});
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}
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// Always set in memory cache as fallback
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this.memoryCache.set(key, value, ttlSeconds);
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memorySuccess = true;
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this.stats.sets++;
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return redisSuccess || memorySuccess;
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} catch (error) {
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console.error(`[Cache] SET error for key ${key}:`, error);
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this.stats.errors++;
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return false;
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}
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}
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async delete(key: string): Promise<boolean> {
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try {
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let redisSuccess = false;
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let memorySuccess = false;
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// Delete from Redis if available
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if (redisManager.isAvailable()) {
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redisSuccess = await redisManager.del(key);
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}
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// Delete from memory cache
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memorySuccess = this.memoryCache.delete(key);
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this.stats.deletes++;
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return redisSuccess || memorySuccess;
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} catch (error) {
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console.error(`[Cache] DELETE error for key ${key}:`, error);
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this.stats.errors++;
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return false;
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}
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}
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async mget<T>(keys: string[]): Promise<Map<string, T>> {
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const result = new Map<string, T>();
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try {
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// Try Redis first for all keys
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if (redisManager.isAvailable()) {
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const redisValues = await redisManager.mget(keys);
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for (let i = 0; i < keys.length; i++) {
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const value = redisValues[i];
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if (value) {
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result.set(keys[i], JSON.parse(value));
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this.stats.redisHits++;
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}
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}
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}
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// For missing keys, check memory cache
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for (const key of keys) {
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if (!result.has(key)) {
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const memoryValue = this.memoryCache.get<T>(key);
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if (memoryValue) {
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result.set(key, memoryValue);
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this.stats.memoryHits++;
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}
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}
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}
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this.stats.hits += result.size;
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this.stats.misses += keys.length - result.size;
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} catch (error) {
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console.error("[Cache] MGET error:", error);
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this.stats.errors++;
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}
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return result;
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}
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async invalidatePattern(pattern: string): Promise<number> {
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try {
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let deleted = 0;
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// Clear from Redis if available
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if (redisManager.isAvailable()) {
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deleted += await redisManager.flushPattern(pattern);
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}
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// Clear from memory cache (simple pattern matching)
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// Note: Memory cache doesn't support patterns, so we clear all if pattern includes wildcards
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if (pattern.includes("*")) {
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this.memoryCache.clear();
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deleted += 1; // Approximate since we cleared all
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} else {
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if (this.memoryCache.delete(pattern)) {
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deleted += 1;
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}
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}
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return deleted;
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} catch (error) {
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console.error(
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`[Cache] Pattern invalidation error for ${pattern}:`,
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error
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);
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this.stats.errors++;
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return 0;
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}
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}
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getStats() {
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return {
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...this.stats,
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hitRate: this.stats.hits / (this.stats.hits + this.stats.misses) || 0,
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redisAvailable: redisManager.isAvailable(),
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memory: this.memoryCache.getStats(),
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};
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}
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async healthCheck() {
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const redisHealth = await redisManager.healthCheck();
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const memoryStats = this.memoryCache.getStats();
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return {
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redis: redisHealth,
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memory: {
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available: true,
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size: memoryStats.size,
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valid: memoryStats.valid,
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expired: memoryStats.expired,
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},
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overall: {
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available: redisHealth.connected || memoryStats.valid >= 0,
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fallbackMode: !redisHealth.connected,
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},
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};
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}
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async shutdown(): Promise<void> {
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this.memoryCache.destroy();
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await redisManager.disconnect();
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}
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}
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// Singleton cache manager
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const cacheManager = new CacheManager();
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// Cache key builders for consistent naming
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export const CacheKeys = {
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user: (userId: string) => `user:${userId}`,
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userByEmail: (email: string) => `user:email:${email}`,
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session: (sessionId: string) => `session:${sessionId}`,
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company: (companyId: string) => `company:${companyId}`,
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companyUsers: (companyId: string) => `company:${companyId}:users`,
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sessionsByCompany: (companyId: string) => `sessions:company:${companyId}`,
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aiModelPricing: (modelId: string) => `ai-model-pricing:${modelId}`,
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processingStats: (companyId?: string) =>
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`processing-stats${companyId ? `:${companyId}` : ":global"}`,
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auditLogs: (companyId: string, filters: string) =>
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`audit-logs:${companyId}:${filters}`,
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};
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// Typed cache operations with automatic TTL based on data type
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export const Cache = {
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// User operations
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async getUser(userId: string) {
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return cacheManager.get<{
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id: string;
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email: string;
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name?: string;
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role: string;
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companyId: string;
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}>(CacheKeys.user(userId));
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},
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async setUser(
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userId: string,
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user: {
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id: string;
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email: string;
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name?: string;
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role: string;
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companyId: string;
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}
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) {
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return cacheManager.set(CacheKeys.user(userId), user, env.REDIS_TTL_USER);
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},
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async getUserByEmail(email: string) {
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return cacheManager.get<{
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id: string;
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email: string;
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name?: string;
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role: string;
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companyId: string;
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}>(CacheKeys.userByEmail(email));
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},
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async setUserByEmail(
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email: string,
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user: {
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id: string;
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email: string;
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name?: string;
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role: string;
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companyId: string;
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}
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) {
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return cacheManager.set(
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CacheKeys.userByEmail(email),
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user,
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env.REDIS_TTL_USER
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);
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},
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// Session operations
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async getSession(sessionId: string) {
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return cacheManager.get<{
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id: string;
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companyId: string;
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startTime: string;
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endTime: string;
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messageCount?: number;
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}>(CacheKeys.session(sessionId));
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},
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async setSession(
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sessionId: string,
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session: {
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id: string;
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companyId: string;
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startTime: string;
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endTime: string;
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messageCount?: number;
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}
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) {
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return cacheManager.set(
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CacheKeys.session(sessionId),
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session,
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env.REDIS_TTL_SESSION
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);
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},
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// Company operations
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async getCompany(companyId: string) {
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return cacheManager.get<{
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id: string;
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name: string;
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status: string;
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}>(CacheKeys.company(companyId));
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},
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async setCompany(
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companyId: string,
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company: {
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id: string;
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name: string;
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status: string;
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}
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) {
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return cacheManager.set(
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CacheKeys.company(companyId),
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company,
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env.REDIS_TTL_COMPANY
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);
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},
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// Generic operations
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async get<T>(key: string): Promise<T | null> {
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return cacheManager.get<T>(key);
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},
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async set<T>(key: string, value: T, ttlSeconds?: number): Promise<boolean> {
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return cacheManager.set(key, value, ttlSeconds);
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},
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async delete(key: string): Promise<boolean> {
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return cacheManager.delete(key);
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},
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async mget<T>(keys: string[]): Promise<Map<string, T>> {
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return cacheManager.mget<T>(keys);
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},
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async invalidatePattern(pattern: string): Promise<number> {
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return cacheManager.invalidatePattern(pattern);
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},
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// Cache invalidation helpers
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async invalidateUser(userId: string) {
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await cacheManager.delete(CacheKeys.user(userId));
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},
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async invalidateUserByEmail(email: string) {
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await cacheManager.delete(CacheKeys.userByEmail(email));
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},
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async invalidateCompany(companyId: string) {
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return cacheManager.invalidatePattern(`company:${companyId}*`);
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},
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async invalidateSession(sessionId: string) {
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await cacheManager.delete(CacheKeys.session(sessionId));
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},
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// Monitoring and management
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getStats() {
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return cacheManager.getStats();
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},
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async healthCheck() {
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return cacheManager.healthCheck();
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},
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async shutdown() {
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return cacheManager.shutdown();
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},
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};
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export { cacheManager };
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