api: implement redis/memory store for cache

api/src/store/redis-store.js

@@ -0,0 +1,62 @@
+import { commandOptions, createClient } from "redis";
+import { env } from "../config.js";
+import { Store } from "./base-store.js";
+
+export default class RedisStore extends Store {
+    #client = createClient({
+        url: env.redisURL,
+    });
+    #connected;
+
+    constructor(name) {
+        super(name);
+        this.#connected = this.#client.connect();
+    }
+
+    #keyOf(key) {
+        return this.id + '_' + key;
+    }
+
+    async _get(key) {
+        await this.#connected;
+
+        const data = await this.#client.hGetAll(
+            commandOptions({ returnBuffers: true }),
+            this.#keyOf(key)
+        );
+
+        if (!data.d) {
+            return null;
+        }
+
+        const type = data.t;
+        if (type && type[0] === 'b'.charCodeAt())
+            return data.d;
+        else
+            return JSON.parse(data.d);
+    }
+
+    async _set(key, val, exp_sec = -1) {
+        await this.#connected;
+
+        const out = { d: val };
+        if (val instanceof Buffer) {
+            out.t = 'b';
+        } else {
+            out.d = JSON.stringify(val);
+        }
+
+        await this.#client.hSet(
+            this.#keyOf(key),
+            out
+        );
+
+        if (exp_sec > 0) {
+            await this.#client.hExpire(
+                this.#keyOf(key),
+                Object.keys(out),
+                exp_sec
+            );
+        }
+    }
+}