fix update stream subjects change retention policy

jetstream_stream.go

@@ -7,6 +7,19 @@ import (
 	"github.com/nats-io/nats.go"
 )
 
+func generateStreamConfig(stream string, subjects []string) *nats.StreamConfig {
+	cfg := nats.StreamConfig{
+		Name:         stream,
+		Subjects:     subjects,
+		Retention:    nats.WorkQueuePolicy,
+		MaxConsumers: -1,
+		MaxMsgSize:   -1,
+		MaxMsgs:      -1,
+		NoAck:        false,
+	}
+	return &cfg
+}
+
 // GetStreamInfo ...
 func (js JetStream) GetStreamInfo(name string) (*nats.StreamInfo, error) {
 	return js.instance.StreamInfo(name)
@@ -22,15 +35,7 @@ func (js JetStream) AddStream(name string, subjects []string) error {
 	// If stream not found, create new
 	if stream == nil {
 		subjectNames := generateSubjectNames(name, subjects)
-		_, err := js.instance.AddStream(&nats.StreamConfig{
+		_, err := js.instance.AddStream(generateStreamConfig(name, subjectNames))
-			Name:         name,
-			Subjects:     subjectNames,
-			Retention:    nats.WorkQueuePolicy,
-			MaxConsumers: -1,
-			MaxMsgSize:   -1,
-			MaxMsgs:      -1,
-			NoAck:        false,
-		})
 		if err != nil {
 			msg := fmt.Sprintf("[NATS JETSTREAM] - add stream error: %s", err.Error())
 			return errors.New(msg)
@@ -62,10 +67,7 @@ func (js JetStream) AddStreamSubjects(name string, subjects []string) error {
 	subjectNames := generateSubjectNames(name, subjects)
 	newSubjects := mergeAndUniqueArrayStrings(subjectNames, stream.Config.Subjects)
 
-	_, err := js.instance.UpdateStream(&nats.StreamConfig{
+	_, err := js.instance.UpdateStream(generateStreamConfig(name, newSubjects))
-		Name:     name,
-		Subjects: newSubjects,
-	})
 	if err != nil {
 		msg := fmt.Sprintf("[NATS JETSTREAM] - add stream error: %s", err.Error())
 		return errors.New(msg)