🏦 refactor: Centralize Caching & Redis Key Prefixing (#8457)

* 🔧 Overhauled caching feature:
- Refactored caching logic.
- Fixed redis prefix, namespace, tls, ttl, and cluster.
- Added REDIS_KEY_PREFIX_VAR

* # refactor: Rename redisCache to standardCache

* # Add Redis pinging mechanism to maintain connection.

* # docs: Add warning about Keyv Redis client prefix support

api/cache/redisClients.js

@@ -0,0 +1,57 @@
+const IoRedis = require('ioredis');
+const { cacheConfig } = require('./cacheConfig');
+const { createClient, createCluster } = require('@keyv/redis');
+
+const GLOBAL_PREFIX_SEPARATOR = '::';
+
+const urls = cacheConfig.REDIS_URI?.split(',').map((uri) => new URL(uri));
+const username = urls?.[0].username || cacheConfig.REDIS_USERNAME;
+const password = urls?.[0].password || cacheConfig.REDIS_PASSWORD;
+const ca = cacheConfig.REDIS_CA;
+
+/** @type {import('ioredis').Redis | import('ioredis').Cluster | null} */
+let ioredisClient = null;
+if (cacheConfig.USE_REDIS) {
+  const redisOptions = {
+    username: username,
+    password: password,
+    tls: ca ? { ca } : undefined,
+    keyPrefix: `${cacheConfig.REDIS_KEY_PREFIX}${GLOBAL_PREFIX_SEPARATOR}`,
+    maxListeners: cacheConfig.REDIS_MAX_LISTENERS,
+  };
+
+  ioredisClient =
+    urls.length === 1
+      ? new IoRedis(cacheConfig.REDIS_URI, redisOptions)
+      : new IoRedis.Cluster(cacheConfig.REDIS_URI, { redisOptions });
+
+  // Pinging the Redis server every 5 minutes to keep the connection alive
+  const pingInterval = setInterval(() => ioredisClient.ping(), 5 * 60 * 1000);
+  ioredisClient.on('close', () => clearInterval(pingInterval));
+  ioredisClient.on('end', () => clearInterval(pingInterval));
+}
+
+/** @type {import('@keyv/redis').RedisClient | import('@keyv/redis').RedisCluster | null} */
+let keyvRedisClient = null;
+if (cacheConfig.USE_REDIS) {
+  // ** WARNING ** Keyv Redis client does not support Prefix like ioredis above.
+  // The prefix feature will be handled by the Keyv-Redis store in cacheFactory.js
+  const redisOptions = { username, password, socket: { tls: ca != null, ca } };
+
+  keyvRedisClient =
+    urls.length === 1
+      ? createClient({ url: cacheConfig.REDIS_URI, ...redisOptions })
+      : createCluster({
+          rootNodes: cacheConfig.REDIS_URI.split(',').map((url) => ({ url })),
+          defaults: redisOptions,
+        });
+
+  keyvRedisClient.setMaxListeners(cacheConfig.REDIS_MAX_LISTENERS);
+
+  // Pinging the Redis server every 5 minutes to keep the connection alive
+  const keyvPingInterval = setInterval(() => keyvRedisClient.ping(), 5 * 60 * 1000);
+  keyvRedisClient.on('disconnect', () => clearInterval(keyvPingInterval));
+  keyvRedisClient.on('end', () => clearInterval(keyvPingInterval));
+}
+
+module.exports = { ioredisClient, keyvRedisClient, GLOBAL_PREFIX_SEPARATOR };