first commit

cmd/main.go

@@ -0,0 +1,93 @@
+package main
+
+import (
+	"context"
+	"fmt"
+	"log"
+	"net/url"
+	"os"
+	"os/signal"
+	"syscall"
+	"time"
+
+	"github.com/eclipse/paho.golang/autopaho"
+	"github.com/eclipse/paho.golang/paho"
+)
+
+func main() {
+	if err := run(); err != nil {
+		log.Fatal(err)
+	}
+}
+
+func run() error {
+	ctx, stop := signal.NotifyContext(context.Background(), os.Interrupt, syscall.SIGTERM)
+	defer stop()
+
+	user := os.Getenv("TEST_MQTT5_MQTT_USERNAME")
+	pass := os.Getenv("TEST_MQTT5_MQTT_PASSWORD")
+
+	if user == "" || pass == "" {
+		return fmt.Errorf("TEST_MQTT5_MQTT_USERNAME and TEST_MQTT5_MQTT_PASSWORD environment variables not set")
+	}
+
+	broker, err := url.Parse("mqtt://127.0.0.1:18883")
+	if err != nil {
+		return fmt.Errorf("failed to parse broker url: %w", err)
+	}
+
+	cfg := autopaho.ClientConfig{
+		ServerUrls:                    []*url.URL{broker},
+		KeepAlive:                     20,
+		CleanStartOnInitialConnection: true,
+		SessionExpiryInterval:         0,
+		ConnectUsername:               user,
+		ConnectPassword:               []byte(pass),
+		OnConnectionUp: func(_ *autopaho.ConnectionManager, ack *paho.Connack) {
+			log.Printf("connected: session_present=%t reason=0x%02x", ack.SessionPresent, ack.ReasonCode)
+		},
+		OnConnectionDown: func() bool {
+			log.Print("connection down; AutoPaho will retry")
+			return true
+		},
+		OnConnectError: func(err error) {
+			log.Printf("connect attempt failed: %v", err)
+		},
+		ClientConfig: paho.ClientConfig{
+			ClientID: "lab-backend",
+			OnClientError: func(err error) {
+				log.Printf("client error: %v", err)
+			},
+			OnServerDisconnect: func(packet *paho.Disconnect) {
+				log.Printf("server disconnected: reason=0x%02x", packet.ReasonCode)
+			},
+		},
+	}
+
+	manager, err := autopaho.NewConnection(ctx, cfg)
+	if err != nil {
+		return fmt.Errorf("failed to create connection manager: %w", err)
+	}
+
+	defer func() {
+		shutdownCtx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
+		defer cancel()
+		if err := manager.Disconnect(shutdownCtx); err != nil {
+			log.Printf("shutdown did not finish within deadline: %v", err)
+		}
+	}()
+
+	startup, cancel := context.WithTimeout(ctx, 10*time.Second)
+	err = manager.AwaitConnection(startup)
+	cancel()
+
+	if err != nil {
+		return fmt.Errorf("failed to connect to broker: %w", err)
+	}
+
+	log.Print("connected to broker; pres Ctrl+C to stop")
+
+	<-ctx.Done()
+
+	return nil
+}