Use application name as default enhanced fan-out consumer name (#91)

* Use ApplicationName as default for EnhancedFanOutConsumerName

Signed-off-by: Ilia Cimpoes <ilia.cimpoes@ellation.com>

* Add tests

Signed-off-by: Ilia Cimpoes <ilia.cimpoes@ellation.com>

clientlibrary/config/config.go

@@ -175,7 +175,7 @@ type (
 		// Either consumer name or consumer ARN must be specified when Enhanced Fan-Out is enabled.
 		EnableEnhancedFanOutConsumer bool
 
-		// EnhancedFanOutConsumerName is the name of the enhanced fan-out consumer to create.
+		// EnhancedFanOutConsumerName is the name of the enhanced fan-out consumer to create. If this isn't set the ApplicationName will be used.
 		EnhancedFanOutConsumerName string
 
 		// EnhancedFanOutConsumerARN is the ARN of an already created enhanced fan-out consumer, if this is set no automatic consumer creation will be attempted

clientlibrary/config/config_test.go

@@ -34,7 +34,7 @@ func TestConfig(t *testing.T) {
 		WithIdleTimeBetweenReadsInMillis(20).
 		WithCallProcessRecordsEvenForEmptyRecordList(true).
 		WithTaskBackoffTimeMillis(10).
-		WithEnhancedFanOutConsumer("fan-out-consumer")
+		WithEnhancedFanOutConsumerName("fan-out-consumer")
 
 	assert.Equal(t, "appName", kclConfig.ApplicationName)
 	assert.Equal(t, 500, kclConfig.FailoverTimeMillis)
@@ -47,9 +47,17 @@ func TestConfig(t *testing.T) {
 	contextLogger.Infof("Default logger is awesome")
 }
 
+func TestConfigDefaultEnhancedFanOutConsumerName(t *testing.T) {
+	kclConfig := NewKinesisClientLibConfig("appName", "StreamName", "us-west-2", "workerId")
+
+	assert.Equal(t, "appName", kclConfig.ApplicationName)
+	assert.False(t, kclConfig.EnableEnhancedFanOutConsumer)
+	assert.Equal(t, "appName", kclConfig.EnhancedFanOutConsumerName)
+}
+
 func TestEmptyEnhancedFanOutConsumerName(t *testing.T) {
 	assert.PanicsWithValue(t, "Non-empty value expected for EnhancedFanOutConsumerName, actual: ", func() {
-		NewKinesisClientLibConfig("app", "stream", "us-west-2", "worker").WithEnhancedFanOutConsumer("")
+		NewKinesisClientLibConfig("app", "stream", "us-west-2", "worker").WithEnhancedFanOutConsumerName("")
 	})
 }
 

clientlibrary/config/kcl-config.go

@@ -73,6 +73,7 @@ func NewKinesisClientLibConfigWithCredentials(applicationName, streamName, regio
 		KinesisCredentials:                               kiniesisCreds,
 		DynamoDBCredentials:                              dynamodbCreds,
 		TableName:                                        applicationName,
+		EnhancedFanOutConsumerName:                       applicationName,
 		StreamName:                                       streamName,
 		RegionName:                                       regionName,
 		WorkerID:                                         workerID,
@@ -213,10 +214,18 @@ func (c *KinesisClientLibConfiguration) WithMonitoringService(mService metrics.M
 	return c
 }
 
-// WithEnhancedFanOutConsumer enables enhanced fan-out consumer with the specified name
+// WithEnhancedFanOutConsumer sets EnableEnhancedFanOutConsumer. If enhanced fan-out is enabled and ConsumerName is not specified ApplicationName is used as ConsumerName.
 // For more info see: https://docs.aws.amazon.com/streams/latest/dev/enhanced-consumers.html
 // Note: You can register up to twenty consumers per stream to use enhanced fan-out.
-func (c *KinesisClientLibConfiguration) WithEnhancedFanOutConsumer(consumerName string) *KinesisClientLibConfiguration {
+func (c *KinesisClientLibConfiguration) WithEnhancedFanOutConsumer(enable bool) *KinesisClientLibConfiguration {
+	c.EnableEnhancedFanOutConsumer = enable
+	return c
+}
+
+// WithEnhancedFanOutConsumerName enables enhanced fan-out consumer with the specified name
+// For more info see: https://docs.aws.amazon.com/streams/latest/dev/enhanced-consumers.html
+// Note: You can register up to twenty consumers per stream to use enhanced fan-out.
+func (c *KinesisClientLibConfiguration) WithEnhancedFanOutConsumerName(consumerName string) *KinesisClientLibConfiguration {
 	checkIsValueNotEmpty("EnhancedFanOutConsumerName", consumerName)
 	c.EnhancedFanOutConsumerName = consumerName
 	c.EnableEnhancedFanOutConsumer = true

clientlibrary/worker/worker.go

@@ -184,19 +184,14 @@ func (w *Worker) initialize() error {
 
 	if w.kclConfig.EnableEnhancedFanOutConsumer {
 		log.Debugf("Enhanced fan-out is enabled")
-		switch {
+		w.consumerARN = w.kclConfig.EnhancedFanOutConsumerARN
-		case w.kclConfig.EnhancedFanOutConsumerARN != "":
+		if w.consumerARN == "" {
-			w.consumerARN = w.kclConfig.EnhancedFanOutConsumerARN
-		case w.kclConfig.EnhancedFanOutConsumerName != "":
 			var err error
 			w.consumerARN, err = w.fetchConsumerARNWithRetry()
 			if err != nil {
 				log.Errorf("Failed to fetch consumer ARN for: %s, %v", w.kclConfig.EnhancedFanOutConsumerName, err)
 				return err
 			}
-		default:
-			log.Errorf("Consumer Name or ARN were not specified with enhanced fan-out enabled")
-			return errors.New("Consumer Name or ARN must be specified when enhanced fan-out is enabled")
 		}
 	}
 

test/worker_test.go

@@ -191,7 +191,36 @@ func TestEnhancedFanOutConsumer(t *testing.T) {
 
 	kclConfig := cfg.NewKinesisClientLibConfig(appName, streamName, regionName, workerID).
 		WithInitialPositionInStream(cfg.LATEST).
-		WithEnhancedFanOutConsumer(consumerName).
+		WithEnhancedFanOutConsumerName(consumerName).
+		WithMaxRecords(10).
+		WithMaxLeasesForWorker(1).
+		WithShardSyncIntervalMillis(5000).
+		WithFailoverTimeMillis(300000).
+		WithLogger(log)
+
+	runTest(kclConfig, false, t)
+}
+
+func TestEnhancedFanOutConsumerDefaultConsumerName(t *testing.T) {
+	// At miminal, use standard logrus logger
+	// log := logger.NewLogrusLogger(logrus.StandardLogger())
+	//
+	// In order to have precise control over logging. Use logger with config
+	config := logger.Configuration{
+		EnableConsole:     true,
+		ConsoleLevel:      logger.Debug,
+		ConsoleJSONFormat: false,
+		EnableFile:        true,
+		FileLevel:         logger.Info,
+		FileJSONFormat:    true,
+		Filename:          "log.log",
+	}
+	// Use logrus logger
+	log := logger.NewLogrusLoggerWithConfig(config)
+
+	kclConfig := cfg.NewKinesisClientLibConfig(appName, streamName, regionName, workerID).
+		WithInitialPositionInStream(cfg.LATEST).
+		WithEnhancedFanOutConsumer(true).
 		WithMaxRecords(10).
 		WithMaxLeasesForWorker(1).
 		WithShardSyncIntervalMillis(5000).