Building Slack integration

backend/lib/queue.ts

@@ -22,12 +22,27 @@ const backoffDelay = (attempt: number): number => {
   return window + Math.random() * window;
 };
 
+/**
+ * A job signals that retrying cannot change the outcome by throwing an error
+ * carrying `permanent: true`. A revoked credential or a deleted channel is a
+ * settled fact; spending the remaining attempts on it only delays every job
+ * behind it and buries the real reason under retry noise.
+ */
+const isPermanent = (err: unknown): boolean =>
+  typeof err === 'object' &&
+  err !== null &&
+  (err as { permanent?: unknown }).permanent === true;
+
 const runEntry = async (entry: QueueEntry): Promise<void> => {
   for (let attempt = 1; ; attempt += 1) {
     try {
       await entry.job();
       return;
     } catch (err) {
+      if (isPermanent(err)) {
+        console.error(`[queue] job "${entry.name}" abandoned as permanent`, err);
+        return;
+      }
       if (attempt >= settings.maxAttempts) {
         console.error(
           `[queue] job "${entry.name}" abandoned after ${attempt} attempt(s)`,