fixed reconnection logic

cmd/consumer/cs.go

@@ -2,15 +2,13 @@ package main
 
 import (
 	"context"
-	"fmt"
 	"log"
 	"os"
 	"os/signal"
-	"syscall"
-
 	"smpp-transmitter/pkg/data"
 	fl "smpp-transmitter/pkg/logger"
 	"smpp-transmitter/pkg/mq"
+	"syscall"
 
 	"github.com/joho/godotenv"
 	"gorm.io/driver/mysql"
@@ -25,41 +23,35 @@ func main() {
 	}
 
 	// Load environment variables
-	rabbitMQURL := os.Getenv("RABBITMQ_URL")
 	mysqlDSN := os.Getenv("MYSQL_DSN")
-	queueName := os.Getenv("QUEUE_NAME")
-	exchangeName := os.Getenv("EXCHABGE_NAME")
 	appEnv := os.Getenv("APP_ENV")
-	routeKey := os.Getenv("ROUTE_KEY")
 
-	if rabbitMQURL == "" || mysqlDSN == "" || queueName == "" || exchangeName == "" || routeKey == "" {
+	if mysqlDSN == "" {
-		log.Fatal("RABBITMQ_URL, MYSQL_DSN, and QUEUE_NAME environment variables must be set")
+		log.Fatal("MYSQL_DSN environment variable must be set")
 	}
 
 	Log, err := fl.SetupLogger(appEnv)
 	if err != nil {
 		log.Fatalf("Failed to set up logger: %v", err)
 	}
-	fmt.Printf("DB: %s", mysqlDSN)
+
 	// Initialize MySQL database connection
 	db, err := gorm.Open(mysql.Open(mysqlDSN), &gorm.Config{
 		Logger: logger.Default.LogMode(logger.Info),
 	})
-
 	if err != nil {
 		Log.Error("Failed to connect to MySQL:", err)
-		log.Fatalf("Failed to connect to MySQL: %v", err)
+		panic("Failed to connect to MySQL")
 	}
 
 	//initilize rabbitmq
-	messageQueue := mq.NewRabbitMQ(rabbitMQURL, exchangeName, queueName, routeKey)
+	messageQueue, err := mq.NewRabbitMQ()
-
+	if err != nil {
-	// Start message processing
+		log.Fatalf("Failed to set up Message Broker: %v", err)
-	ctx, cancel := context.WithCancel(context.Background())
+	}
-	defer cancel()
 
 	// Run RabbitMQ consumer
-	go messageQueue.Consume(ctx, func(ctx context.Context, body []byte) {
+	go messageQueue.Consume(func(ctx context.Context, body []byte) {
 		message := &data.Message{}
 
 		Log.Info("Received a raw message", "body", string(body))
@@ -74,7 +66,7 @@ func main() {
 			return
 		}
 
-		fmt.Printf("Message handled %v", string(body))
+		log.Printf("Message handled %v", string(body))
 
 	})
 
@@ -84,4 +76,5 @@ func main() {
 	<-sigs
 	log.Println("Shutting down...")
 	Log.Info("Shutting down...")
+	os.Exit(0)
 }

pkg/mq/rabbitmq.go

@@ -2,14 +2,16 @@ package mq
 
 import (
 	"context"
+	"fmt"
 	"log"
+	"os"
 	"time"
 
 	"github.com/streadway/amqp"
 )
 
 type MessageQueue interface {
-	Consume(ctx context.Context, processMessage func(ctx context.Context, body []byte))
+	Consume(processMessage func(ctx context.Context, body []byte))
 }
 
 type rabbitMQ struct {
@@ -17,74 +19,108 @@ type rabbitMQ struct {
 	exchangeName string
 	queueName    string
 	routingKey   string
+	conn         *amqp.Connection
+	channel      *amqp.Channel
 }
 
-func NewRabbitMQ(rabbitMQURL, exchangeName, queueName, routingKey string) MessageQueue {
+func NewRabbitMQ() (MessageQueue, error) {
+	rabbitMQURL := os.Getenv("RABBITMQ_URL")
+	routeKey := os.Getenv("ROUTE_KEY")
+	queueName := os.Getenv("QUEUE_NAME")
+	exchangeName := os.Getenv("EXCHABGE_NAME")
+
+	if rabbitMQURL == "" || queueName == "" || exchangeName == "" || routeKey == "" {
+		return nil, fmt.Errorf("RABBITMQ_URL, ROUTE_KEY, EXCHABGE_NAME and QUEUE_NAME environment variables must be set")
+	}
+
 	return &rabbitMQ{
 		rabbitMQURL:  rabbitMQURL,
 		exchangeName: exchangeName,
 		queueName:    queueName,
-		routingKey:   routingKey,
+		routingKey:   routeKey,
-	}
+	}, nil
 }
 
-func (r *rabbitMQ) Consume(ctx context.Context, messageHandler func(ctx context.Context, body []byte)) {
+func (r *rabbitMQ) connect() error {
-	for {
+	var err error
-		conn, err := amqp.Dial(r.rabbitMQURL)
+	r.conn, err = amqp.Dial(r.rabbitMQURL)
 	if err != nil {
 		log.Printf("Failed to connect to RabbitMQ: %v", err)
-			time.Sleep(5 * time.Second) // Wait before retrying
+		return err
-			continue
 	}
-		defer conn.Close()
 
-		ch, err := conn.Channel()
+	// Open a channel
+	r.channel, err = r.conn.Channel()
 	if err != nil {
+		r.conn.Close()
 		log.Printf("Failed to open a channel: %v", err)
-			time.Sleep(5 * time.Second) // Wait before retrying
+		return err
-			continue
 	}
-		defer ch.Close()
 
-		// Declare the exchange
+	// Declare exchange
-		err = ch.ExchangeDeclare(
+	err = r.channel.ExchangeDeclare(
-			r.exchangeName, // name of the exchange
+		r.exchangeName,
-			"direct",       // type of exchange
+		"direct",
-			true,           // durable
+		true,
-			false,          // auto-delete
+		false,
-			false,          // internal
+		false,
-			false,          // no-wait
+		false,
-			nil,            // arguments
+		nil,
 	)
 	if err != nil {
+		r.channel.Close()
+		r.conn.Close()
 		log.Printf("Failed to declare exchange: %v", err)
-			time.Sleep(5 * time.Second) // Wait before retrying
+		return err
-			continue
 	}
 
-		q, err := ch.QueueDeclare(
+	// Declare queue
-			r.queueName, // name
+	_, err = r.channel.QueueDeclare(
-			true,        // durable
+		r.queueName,
-			false,       // delete when unused
+		true,
-			false,       // exclusive
+		false,
-			false,       // no-wait
+		false,
-			nil,         // arguments
+		false,
+		nil,
 	)
 	if err != nil {
+		r.channel.Close()
+		r.conn.Close()
 		log.Printf("Failed to declare a queue: %v", err)
-			time.Sleep(5 * time.Second) // Wait before retrying
+		return err
-			continue
 	}
-		err = ch.QueueBind(
+
+	// Bind queue
+	err = r.channel.QueueBind(
 		r.queueName,
 		r.routingKey,
 		r.exchangeName,
 		false,
 		nil,
 	)
+	if err != nil {
+		r.channel.Close()
+		r.conn.Close()
+		log.Printf("Failed to bind queue: %v", err)
+		return err
+	}
 
-		msgs, err := ch.Consume(
+	return nil
-			q.Name, // queue
+}
+
+func (r *rabbitMQ) Consume(messageHandler func(ctx context.Context, body []byte)) {
+
+	for {
+		// Establish initial connection and setup
+		if err := r.connect(); err != nil {
+			log.Printf("Error setting up RabbitMQ: %v. Retrying in 5 seconds...", err)
+			time.Sleep(5 * time.Second) // Wait before retrying
+			continue
+		}
+
+		// Consume messages
+		msgs, err := r.channel.Consume(
+			r.queueName, // queue
 			"",          // consumer
 			true,        // auto-ack
 			false,       // exclusive
@@ -94,16 +130,29 @@ func (r *rabbitMQ) Consume(ctx context.Context, messageHandler func(ctx context.
 		)
 		if err != nil {
 			log.Printf("Failed to register a consumer: %v", err)
+			r.channel.Close()
+			r.conn.Close()
 			time.Sleep(5 * time.Second) // Wait before retrying
 			continue
 		}
+		// Start message processing
+		ctx, cancel := context.WithCancel(context.Background())
+		defer cancel()
 
 		for {
 			select {
-			case msg := <-msgs:
+			case msg, ok := <-msgs:
+				if !ok {
+					log.Println("Message channel closed, reconnecting...")
+					r.channel.Close()
+					r.conn.Close()
+					break // Break inner loop to reconnect
+				}
 				messageHandler(ctx, msg.Body)
 			case <-ctx.Done():
-				log.Println("Consumer stopped.")
+				log.Println("Context canceled, shutting down...")
+				r.channel.Close()
+				r.conn.Close()
 				return
 			}
 		}