Add ordered consumer, FetchBytes and Next, rework options

Signed-off-by: Piotr Piotrowski <piotr@synadia.com>

examples/jsv2/js-next/main.go

@@ -20,46 +20,60 @@ import (
 	"time"
 
 	"github.com/nats-io/nats.go"
-	"github.com/nats-io/nats.go/jsv2/jetstream"
+	"github.com/nats-io/nats.go/jetstream"
 )
 
 func main() {
-	ctx, cancel := context.WithTimeout(context.Background(), 10*time.Minute)
+	ctx, cancel := context.WithTimeout(context.Background(), 60*time.Minute)
 	defer cancel()
 
-	nc, err := nats.Connect("127.0.0.1:4222")
+	nc, err := nats.Connect("nats://127.0.0.1:4222")
 	if err != nil {
 		log.Fatal(err)
 	}
-	defer nc.Flush()
 
 	js, err := jetstream.New(nc)
 	if err != nil {
 		log.Fatal(err)
 	}
-
-	s, err := js.CreateStream(ctx, jetstream.StreamConfig{Name: "TEST_STREAM", Subjects: []string{"FOO.*"}})
+	s, err := js.CreateStream(ctx, jetstream.StreamConfig{
+		Name:     "TEST_STREAM",
+		Subjects: []string{"FOO.*"},
+	})
 	if err != nil {
 		log.Fatal(err)
 	}
 
-	cons, err := s.CreateConsumer(ctx, jetstream.ConsumerConfig{Durable: "TestConsumerReader", AckPolicy: jetstream.AckExplicitPolicy})
+	cons, err := s.AddConsumer(ctx, jetstream.ConsumerConfig{
+		Durable:   "TestConsumerListener",
+		AckPolicy: jetstream.AckExplicitPolicy,
+	})
 	if err != nil {
 		log.Fatal(err)
 	}
+	go endlessPublish(ctx, nc, js)
 
-	reader, err := cons.Reader()
-	if err != nil {
-		log.Fatal(err)
-	}
-	for i := 0; i < 10; i++ {
-		msg, err := reader.Next()
+	for {
+		msg, err := cons.Next()
 		if err != nil {
-			log.Fatal(err)
+			fmt.Println(err)
+			continue
 		}
 		fmt.Println(string(msg.Data()))
 		msg.Ack()
 	}
-
-	reader.Stop()
+}
+
+func endlessPublish(ctx context.Context, nc *nats.Conn, js jetstream.JetStream) {
+	var i int
+	for {
+		time.Sleep(500 * time.Millisecond)
+		if nc.Status() != nats.CONNECTED {
+			continue
+		}
+		if _, err := js.Publish(ctx, "FOO.TEST1", []byte(fmt.Sprintf("msg %d", i))); err != nil {
+			fmt.Println("pub error: ", err)
+		}
+		i++
+	}
 }