Comments

cmd/backend/backend.go

@@ -32,14 +32,14 @@ func main() {
 		log.Fatalf("declare exchange: %s", err)
 	}
 
-	// Start a Rabbit consumer with a message processing handler.
-	conn.StartConsumer(conf.Exchange, conf.QueueBack, conf.KeyBack, receiveMessages)
+	// Start a Rabbit consumer with a handler for printing messages.
+	conn.StartConsumer(conf.Exchange, conf.QueueBack, conf.KeyBack, printMessages)
 
 	publishInput(conn)
 }
 
-// receiveMessages prints messages to stdout.
-func receiveMessages(d amqp.Delivery) bool {
+// printMessages prints messages to stdout.
+func printMessages(d amqp.Delivery) bool {
 	var message models.Message
 	err := json.Unmarshal(d.Body, &message)
 	if err != nil {
@@ -55,7 +55,6 @@ func receiveMessages(d amqp.Delivery) bool {
 // a Rabbit exchange with the front-end and database routing keys.
 func publishInput(conn *rabbit.Conn) {
 	reader := bufio.NewReader(os.Stdin)
-
 	for {
 		input, _ := reader.ReadString('\n')
 		input = strings.TrimSpace(input)
@@ -68,6 +67,7 @@ func publishInput(conn *rabbit.Conn) {
 		if err != nil {
 			log.Fatalf("marshal message: %s", err)
 		}
+
 		err = conn.Publish(conf.Exchange, conf.KeyFront+"."+conf.KeyDB, message)
 		if err != nil {
 			log.Fatalf("publish message: %s", err)

internal/rabbit/consume.go

@@ -13,6 +13,7 @@ import (
 // The queue is created (or connected to, if exists) and bound to an exchange.
 // Used for durable queues in the main go routine.
 func (conn *Conn) StartConsumer(exch, qName, rKey string, handler func(amqp.Delivery) bool) error {
+	// Declare a durable queue
 	_, err := conn.Channel.QueueDeclare(qName, true, false, false, false, nil)
 	if err != nil {
 		return fmt.Errorf("queue declare: %v", err)

internal/rabbit/publish.go

@@ -6,8 +6,8 @@ import (
 	"github.com/streadway/amqp"
 )
 
-// Publish publishes a message to a Rabbit exchange using a channel
-// opened upon connection to Rabbit. For use in the main go routine.
+// Publish publishes a message to a Rabbit exchange using the main channel.
+// For use in the main go routine.
 func (conn Conn) Publish(exch, rKey string, message []byte) error {
 	return PublishInChannel(conn.Channel, exch, rKey, message)
 }