Delete bucket listener config file from disk (#3016)

cmd/bucket-handlers.go

@@ -562,10 +562,13 @@ func (api objectAPIHandlers) DeleteBucketHandler(w http.ResponseWriter, r *http.
 	}
 
 	// Delete bucket access policy, if present - ignore any errors.
-	removeBucketPolicy(bucket, objectAPI)
+	_ = removeBucketPolicy(bucket, objectAPI)
 
 	// Delete notification config, if present - ignore any errors.
-	removeNotificationConfig(bucket, objectAPI)
+	_ = removeNotificationConfig(bucket, objectAPI)
+
+	// Delete listener config, if present - ignore any errors.
+	_ = removeListenerConfig(bucket, objectAPI)
 
 	// Write success response.
 	writeSuccessNoContent(w)

cmd/event-notifier.go

@@ -205,19 +205,21 @@ func (en *eventNotifier) GetBucketListenerConfig(bucket string) []listenerConfig
 func (en *eventNotifier) SetBucketListenerConfig(bucket string, lcfg []listenerConfig) error {
 	en.internal.rwMutex.Lock()
 	defer en.internal.rwMutex.Unlock()
-	if lcfg == nil {
+	if len(lcfg) == 0 {
 		delete(en.internal.listenerConfigs, bucket)
 	} else {
 		en.internal.listenerConfigs[bucket] = lcfg
 	}
 	en.internal.targets = make(map[string]*listenerLogger)
-	for _, lc := range lcfg {
-		logger, err := newListenerLogger(lc.TopicConfig.TopicARN,
-			lc.TargetServer)
+	for _, elcArr := range en.internal.listenerConfigs {
+		for _, elcElem := range elcArr {
+			currArn := elcElem.TopicConfig.TopicARN
+			logger, err := newListenerLogger(currArn, elcElem.TargetServer)
 			if err != nil {
 				return err
 			}
-		en.internal.targets[lc.TopicConfig.TopicARN] = logger
+			en.internal.targets[currArn] = logger
+		}
 	}
 	return nil
 }
@@ -443,6 +445,15 @@ func persistListenerConfig(bucket string, lcfg []listenerConfig, obj ObjectLayer
 	return err
 }
 
+// Remove listener configuration from storage layer. Used when a
+// bucket is deleted.
+func removeListenerConfig(bucket string, obj ObjectLayer) error {
+	// make the path
+	lcPath := path.Join(bucketConfigPrefix, bucket, bucketListenerConfig)
+	// remove it
+	return obj.DeleteObject(minioMetaBucket, lcPath)
+}
+
 // loads all bucket notifications if present.
 func loadAllBucketNotifications(objAPI ObjectLayer) (map[string]*notificationConfig, map[string][]listenerConfig, error) {
 	// List buckets to proceed loading all notification configuration.