feat(catalog) : sync Lunaris updates from Discord

lib/catalog/sync-lock.ts

@@ -0,0 +1,57 @@
+import { randomUUID } from "node:crypto";
+
+import { getRedisClient, redisEventPrefix } from "@/lib/redis/client";
+
+const LOCK_TTL_MS = 120_000;
+const RENEW_INTERVAL_MS = 30_000;
+
+const renewScript = `
+if redis.call("get", KEYS[1]) == ARGV[1] then
+  return redis.call("pexpire", KEYS[1], ARGV[2])
+end
+return 0
+`;
+
+const releaseScript = `
+if redis.call("get", KEYS[1]) == ARGV[1] then
+  return redis.call("del", KEYS[1])
+end
+return 0
+`;
+
+export class CatalogSyncBusyError extends Error {
+  constructor() {
+    super("กำลัง Sync Catalog อยู่");
+    this.name = "CatalogSyncBusyError";
+  }
+}
+
+export async function withCatalogSyncLock<T>(
+  task: () => Promise<T>,
+): Promise<T> {
+  const redis = await getRedisClient();
+  const key = `${redisEventPrefix()}:catalog-sync-lock`;
+  const token = randomUUID();
+  const acquired = await redis.set(key, token, "PX", LOCK_TTL_MS, "NX");
+  if (acquired !== "OK") throw new CatalogSyncBusyError();
+
+  let renewing = false;
+  const timer = setInterval(() => {
+    if (renewing) return;
+    renewing = true;
+    void redis
+      .eval(renewScript, 1, key, token, String(LOCK_TTL_MS))
+      .catch(() => undefined)
+      .finally(() => {
+        renewing = false;
+      });
+  }, RENEW_INTERVAL_MS);
+  timer.unref();
+
+  try {
+    return await task();
+  } finally {
+    clearInterval(timer);
+    await redis.eval(releaseScript, 1, key, token).catch(() => undefined);
+  }
+}