fix: generic pubsub

Author: ochom

pubsub/consumer.go

@@ -4,14 +4,19 @@ import "fmt"
 
 // Consumer ...
 type Consumer struct {
-	url      string
-	exchange string
-	queue    string
+	url         string
+	exchange    string
+	queue       string
+	enableDelay bool
 }
 
 // Create a new consumer instance
-func NewConsumer(rabbitURL, exchange, queue string) *Consumer {
-	return &Consumer{rabbitURL, exchange, queue}
+func NewConsumer(rabbitURL, exchange, queue string, config ...Config) *Consumer {
+	if len(config) > 0 {
+		return &Consumer{rabbitURL, exchange, queue, config[0].EnableDelay}
+	}
+
+	return &Consumer{rabbitURL, exchange, queue, false}
 }
 
 // Consume consume messages from the channels
@@ -23,7 +28,7 @@ func (c *Consumer) Consume(workerFunc func([]byte)) error {
 	defer ch.Close()
 	defer conn.Close()
 
-	if err := initPubSub(ch, c.exchange, c.queue); err != nil {
+	if err := initPubSub(ch, c.exchange, c.queue, c.enableDelay); err != nil {
 		return fmt.Errorf("failed to initialize a pubsub: %s", err.Error())
 	}
 

pubsub/publisher.go

@@ -9,14 +9,19 @@ import (
 
 // publisher ...
 type publisher struct {
-	url      string
-	exchange string
-	queue    string
+	url         string
+	exchange    string
+	queue       string
+	enableDelay bool
 }
 
 // NewPublisher  creates a new publisher to rabbit
-func NewPublisher(rabbitURL, exchange, queue string) *publisher {
-	return &publisher{rabbitURL, exchange, queue}
+func NewPublisher(rabbitURL, exchange, queue string, config ...Config) *publisher {
+	if len(config) > 0 {
+		return &publisher{rabbitURL, exchange, queue, config[0].EnableDelay}
+	}
+
+	return &publisher{rabbitURL, exchange, queue, false}
 }
 
 // publish ...
@@ -28,7 +33,7 @@ func (p *publisher) publish(body []byte, delay time.Duration) error {
 	defer ch.Close()
 	defer conn.Close()
 
-	if err := initPubSub(ch, p.exchange, p.queue); err != nil {
+	if err := initPubSub(ch, p.exchange, p.queue, p.enableDelay); err != nil {
 		return fmt.Errorf("failed to initialize a pubsub: %s", err.Error())
 	}
 

pubsub/pubsub.go

@@ -6,6 +6,11 @@ import (
 	"github.com/streadway/amqp"
 )
 
+// Config  for publisher and consumer
+type Config struct {
+	EnableDelay bool
+}
+
 func initQ(url string) (*amqp.Connection, *amqp.Channel, error) {
 	conn, err := amqp.Dial(url)
 	if err != nil {
@@ -26,14 +31,19 @@ func initQ(url string) (*amqp.Connection, *amqp.Channel, error) {
 }
 
 // initPubSub ...
-func initPubSub(ch *amqp.Channel, exchangeName, queueName string) error {
+func initPubSub(ch *amqp.Channel, exchangeName, queueName string, enableDelay bool) error {
+	exchangeType := "direct"
+	if enableDelay {
+		exchangeType = "x-delayed-message"
+	}
+
 	err := ch.ExchangeDeclare(
-		exchangeName,        // name
-		"x-delayed-message", // type
-		true,                // durable
-		false,               // auto-deleted
-		false,               // internal
-		false,               // no-wait
+		exchangeName, // name
+		exchangeType, // type
+		true,         // durable
+		false,        // auto-deleted
+		false,        // internal
+		false,        // no-wait
 		amqp.Table{
 			"x-delayed-type": "direct",
 		}, // arguments