Redis — Animate | AI Wisdom

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🎞 ANIMATE · Mode 3 of 5 · +100 XP— Redis Caching
📋Connect
⚙️Cache-Aside
🔄TTL
✅Invalidate
🎯 Next: Test →
Step 1 / 4
Speed
Connect
createClient() creates a Redis client — connect() establishes TCP connection💡 Analogy
Like establishing a direct phone line to a colleague — keep it open for fast communication.
Redis is an in-memory key-value store. Connect once at startup and reuse the client — it automatically handles reconnection.
Console Output
> Connected to Redis: redis://localhost:6379
> PING → PONG
> Ready
●redis_cache.ts
ConnectL1–4
1import { createClient } from 'redis';
2 
3const redis = createClient({ url: process.env.REDIS_URL });
4await redis.connect();
5 
6// Cache-aside pattern with TTL
7async function getCachedUser(userId: string) {
8  const cacheKey = `user:${userId}`;
9 
10  // 1. Check cache first
11  const cached = await redis.get(cacheKey);
12  if (cached) {
13    return JSON.parse(cached);           // Cache hit — no DB call
14  }
15 
16  // 2. Cache miss — fetch from database
17  const user = await db.users.findById(userId);
18  if (!user) return null;
19 
20  // 3. Store in cache with 5-minute TTL
21  await redis.setEx(cacheKey, 300, JSON.stringify(user));
22 
23  return user;
24}
25 
26// Cache invalidation on update
27async function updateUser(userId: string, data: Partial<User>) {
28  const updated = await db.users.update(userId, data);
29  await redis.del(`user:${userId}`);    // Bust cache after write
30  return updated;
31}
32 
33// Counter with atomic increment
34async function trackPageView(page: string) {
35  const key = `pageviews:${page}:${new Date().toISOString().slice(0, 10)}`;
36  const count = await redis.incr(key);
37  await redis.expire(key, 86400 * 7);  // Expire after 7 days
38  return count;
39}
39 lines
Timeline — 4 Steps
Connect
createClient() creates a Redis client — connect() establishes TCP connection💡 Analogy
Like establishing a direct phone line to a colleague — keep it open for fast communication.
Redis is an in-memory key-value store. Connect once at startup and reuse the client — it automatically handles reconnection.
Console Output
> Connected to Redis: redis://localhost:6379
> PING → PONG
> Ready

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Discussion

createClient() creates a Redis client — connect() establishes TCP connection

💡 Analogy

Like establishing a direct phone line to a colleague — keep it open for fast communication.

Redis is an in-memory key-value store. Connect once at startup and reuse the client — it automatically handles reconnection.

Console Output

> Connected to Redis: redis://localhost:6379
> PING → PONG
> Ready

createClient() creates a Redis client — connect() establishes TCP connection

💡 Analogy

Like establishing a direct phone line to a colleague — keep it open for fast communication.

Redis is an in-memory key-value store. Connect once at startup and reuse the client — it automatically handles reconnection.

Console Output

> Connected to Redis: redis://localhost:6379
> PING → PONG
> Ready