574bcf2264
- Add ioredis dependency for Redis connection pooling - Create RedisService singleton with connection management - Add Redis config (url, dedupWindowSeconds) to notification.config.ts - Implement NotificationService.checkRateLimit using Redis INCR+EXPIRE - Implement NotificationService.deduplicateNotification using Redis SET/NX - Add configurable rate limit windows and thresholds via env vars - Add 29 unit tests covering Redis operations, rate limiting, and dedup - All tests pass, TypeScript compiles cleanly for new files
74 lines
1.9 KiB
TypeScript
74 lines
1.9 KiB
TypeScript
import { Redis, RedisOptions } from 'ioredis';
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export interface RedisServiceConfig {
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url?: string;
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options?: RedisOptions;
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}
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export class RedisService {
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private static instance: RedisService;
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private client: Redis;
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private constructor(config?: RedisServiceConfig) {
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const url = config?.url || process.env.REDIS_URL || 'redis://localhost:6379';
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this.client = new Redis(url, config?.options || {});
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}
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static getInstance(config?: RedisServiceConfig): RedisService {
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if (!RedisService.instance) {
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RedisService.instance = new RedisService(config);
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}
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return RedisService.instance;
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}
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getClient(): Redis {
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return this.client;
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}
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async isConnected(): Promise<boolean> {
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return this.client.status === 'ready';
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}
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async increment(key: string, expirySeconds?: number): Promise<number> {
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const current = await this.client.incr(key);
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if (current === 1 && expirySeconds) {
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await this.client.expire(key, expirySeconds);
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}
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return current;
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}
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async getCounter(key: string): Promise<number> {
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const value = await this.client.get(key);
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return value ? parseInt(value, 10) : 0;
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}
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async setWithExpiry(key: string, value: string, seconds: number): Promise<'OK' | 1> {
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return this.client.setex(key, seconds, value);
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}
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async setIfNotExists(key: string, value: string, seconds: number): Promise<boolean> {
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const result = await this.client.set(key, value, 'EX', seconds, 'NX');
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return result === 'OK';
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}
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async get(key: string): Promise<string | null> {
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return this.client.get(key);
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}
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async ttl(key: string): Promise<number> {
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return this.client.ttl(key);
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}
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async delete(key: string): Promise<number> {
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return this.client.del(key);
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}
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async getTTL(key: string): Promise<number> {
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return this.client.ttl(key);
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}
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async close(): Promise<void> {
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await this.client.quit();
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}
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}
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