Add config option flush_interval

sinks/influxAsyncSink.go

@@ -22,7 +22,10 @@ type InfluxAsyncSinkConfig struct {
 	Organization string `json:"organization,omitempty"`
 	SSL          bool   `json:"ssl,omitempty"`
 	RetentionPol string `json:"retention_policy,omitempty"`
+	// Maximum number of points sent to server in single request. Default 5000
 	BatchSize uint `json:"batch_size,omitempty"`
+	// Interval, in ms, in which is buffer flushed if it has not been already written (by reaching batch size) . Default 1000ms
+	FlushInterval uint `json:"flush_interval,omitempty"`
 }
 
 type InfluxAsyncSink struct {
@@ -48,12 +51,13 @@ func (s *InfluxAsyncSink) connect() error {
 		auth = fmt.Sprintf("%s:%s", s.config.User, s.config.Password)
 	}
 	cclog.ComponentDebug(s.name, "Using URI", uri, "Org", s.config.Organization, "Bucket", s.config.Database)
-	batch := s.config.BatchSize
-	if batch == 0 {
-		batch = 100
-	}
 	clientOptions := influxdb2.DefaultOptions()
-	clientOptions.SetBatchSize(batch)
+	if s.config.BatchSize != 0 {
+		clientOptions.SetBatchSize(s.config.BatchSize)
+	}
+	if s.config.FlushInterval != 0 {
+		clientOptions.SetFlushInterval(s.config.FlushInterval)
+	}
 	clientOptions.SetTLSConfig(
 		&tls.Config{
 			InsecureSkipVerify: true,
@@ -66,7 +70,10 @@ func (s *InfluxAsyncSink) connect() error {
 
 func (s *InfluxAsyncSink) Init(config json.RawMessage) error {
 	s.name = "InfluxSink"
+
+	// Set default for maximum number of points sent to server in single request.
 	s.config.BatchSize = 100
+
 	if len(config) > 0 {
 		err := json.Unmarshal(config, &s.config)
 		if err != nil {