feat: add cache client

Author: cameri

src/cache/client.ts

@@ -0,0 +1,15 @@
+import { createClient, RedisClientOptions } from 'redis'
+import { Cache } from '../@types/cache'
+
+export const getCacheConfig = (): RedisClientOptions => ({
+  url: `redis://${process.env.REDIS_USER}:${process.env.REDIS_PASSWORD}@${process.env.REDIS_HOST}:${process.env.REDIS_PORT}`,
+  password: process.env.REDIS_PASSWORD,
+})
+
+export const getCacheClient = (): Cache => {
+  const config = getCacheConfig()
+
+  const client = createClient(config)
+
+  return client
+}

src/factories/rate-limiter-factory.ts

@@ -0,0 +1,16 @@
+import { getCacheClient } from '../cache/client'
+import { ICacheAdapter } from '../@types/adapters'
+import { IRateLimiter } from '../@types/utils'
+import { RedisAdapter } from '../adapters/redis-adapter'
+import { SlidingWindowRateLimiter } from '../utils/sliding-window-rate-limiter'
+
+let instance: IRateLimiter = undefined
+
+export const slidingWindowRateLimiterFactory = () => {
+  if (!instance) {
+    const cache: ICacheAdapter = new RedisAdapter(getCacheClient())
+    instance = new SlidingWindowRateLimiter(cache)
+  }
+
+  return instance
+}