Add redis

+ Add a public lib file for redis
  + Add an indexed auth client
  + Add a function to create promisified partial clients
+ Add password revisions to the auth redis index

src/lib/redis.ts

@@ -0,0 +1,27 @@
+import redis from "redis";
+import { promisify } from "util";
+
+const REDIS_INDICES = {
+  auth: 0,
+};
+
+const REDIS_HOST = process.env.REDIS_HOST || "redis";
+const REDIS_PORT = process.env.REDIS_PORT ? parseInt(process.env.REDIS_PORT) : 6379;
+
+// TODO: Extend
+function createAsyncClient(client: redis.RedisClient) {
+  return {
+    get: promisify(client.get).bind(client),
+    set: promisify(client.set).bind(client),
+  };
+}
+
+// ----------------- //
+// Redis auth client //
+// ----------------- //
+
+const auth = redis.createClient({ host: REDIS_HOST, port: REDIS_PORT });
+
+auth.select(REDIS_INDICES.auth);
+
+export const authClient = createAsyncClient(auth);