fix(worker): set blockTimeout as 0.001 when reach the time to get del…

…ayed jobs (#2455) fixes #2450

src/classes/worker.ts

@@ -595,37 +595,30 @@ export class Worker<
     }
 
     try {
-      const opts: WorkerOptions = <WorkerOptions>this.opts;
-
       if (!this.closing) {
-        let blockTimeout = Math.max(
-          blockUntil ? (blockUntil - Date.now()) / 1000 : opts.drainDelay,
-          0,
-        );
+        let blockTimeout = this.getBlockTimeout(blockUntil);
 
-        // Blocking for less than 50ms is useless.
-        if (blockTimeout > 0.05) {
-          blockTimeout = this.blockingConnection.capabilities.canDoubleTimeout
-            ? blockTimeout
-            : Math.ceil(blockTimeout);
+        blockTimeout = this.blockingConnection.capabilities.canDoubleTimeout
+          ? blockTimeout
+          : Math.ceil(blockTimeout);
 
-          // We restrict the maximum block timeout to 10 second to avoid
-          // blocking the connection for too long in the case of reconnections
-          // reference: https://github.com/taskforcesh/bullmq/issues/1658
-          blockTimeout = Math.min(blockTimeout, maximumBlockTimeout);
+        // We restrict the maximum block timeout to 10 second to avoid
+        // blocking the connection for too long in the case of reconnections
+        // reference: https://github.com/taskforcesh/bullmq/issues/1658
+        blockTimeout = Math.min(blockTimeout, maximumBlockTimeout);
 
-          // Markers should only be used for un-blocking, so we will handle them in this
-          // function only.
-          const result = await bclient.bzpopmin(this.keys.marker, blockTimeout);
+        // Markers should only be used for un-blocking, so we will handle them in this
+        // function only.
+        const result = await bclient.bzpopmin(this.keys.marker, blockTimeout);
 
-          if (result) {
-            const [_key, member, score] = result;
+        if (result) {
+          const [_key, member, score] = result;
 
-            if (member) {
-              return parseInt(score);
-            }
+          if (member) {
+            return parseInt(score);
           }
         }
+
         return 0;
       }
     } catch (error) {
@@ -641,6 +634,23 @@ export class Worker<
     return Infinity;
   }
 
+  protected getBlockTimeout(blockUntil: number): number {
+    const opts: WorkerOptions = <WorkerOptions>this.opts;
+
+    // when there are delayed jobs
+    if (blockUntil) {
+      const blockDelay = blockUntil - Date.now();
+      // when we reach the time to get new jobs
+      if (blockDelay < 1) {
+        return 0.001;
+      } else {
+        return blockDelay / 1000;
+      }
+    } else {
+      return Math.max(opts.drainDelay, 0);
+    }
+  }
+
   /**
    *
    * This function is exposed only for testing purposes.