initial import

cloud-provider/docker-compose/cmd/receiver/main.go

@@ -0,0 +1,70 @@
+package main
+
+import (
+	"context"
+	"log"
+	"os"
+	"sync"
+	"time"
+
+	"github.com/nats-io/nats.go"
+)
+
+type Message struct {
+	Text string
+}
+
+func connectNATS(ctx context.Context, url string) (*nats.Conn, error) {
+	var err error
+	for {
+		select {
+		case <-ctx.Done():
+			return nil, err
+		default:
+			var nc *nats.Conn
+			nc, err = nats.Connect(url)
+			if err == nil {
+				return nc, err
+			}
+		}
+	}
+
+}
+
+func main() {
+
+	url := nats.DefaultURL
+	if v, ok := os.LookupEnv("NATS_URL"); ok {
+		url = v
+	}
+
+	ctx, cancel := context.WithTimeout(context.Background(), 10*time.Second)
+	defer cancel()
+	nc, err := connectNATS(ctx, url)
+	if err != nil {
+		log.Fatalf("Could not connect to server because of %v", err)
+	}
+	defer nc.Close()
+	log.Println("successfully connected to NATS server")
+
+	c, _ := nats.NewEncodedConn(nc, nats.JSON_ENCODER)
+	defer c.Close()
+
+	wg := sync.WaitGroup{}
+	wg.Add(1)
+
+	sub, err := c.Subscribe("testing", func(message *Message) {
+		log.Printf("neue Nachricht %+v", message)
+	})
+
+	if err != nil {
+		log.Fatalf("Could not subscribe because of %v", err)
+	}
+
+	log.Printf("Warte auf Nachrichten")
+	wg.Wait()
+
+	sub.Unsubscribe()
+	sub.Drain()
+
+}

cloud-provider/docker-compose/cmd/sender/main.go

@@ -0,0 +1,44 @@
+package main
+
+import (
+	"log"
+	"os"
+	"time"
+
+	"github.com/nats-io/nats.go"
+)
+
+type Message struct {
+	Text string
+}
+
+func sendMessage(url string) error {
+	nc, err := nats.Connect(url)
+	if err != nil {
+		return err
+	}
+	defer nc.Close()
+	c, _ := nats.NewEncodedConn(nc, nats.JSON_ENCODER)
+	defer c.Close()
+
+	return c.Publish("testing", &Message{"Hello World"})
+}
+
+func main() {
+
+	url := nats.DefaultURL
+	if v, ok := os.LookupEnv("NATS_URL"); ok {
+		url = v
+	}
+
+	for {
+		err := sendMessage(url)
+		if err != nil {
+			log.Println(err)
+		} else {
+			log.Println("Nachricht versendet")
+		}
+		time.Sleep(4 * time.Second)
+	}
+
+}