fix

rabbitmq/connect.go

@@ -0,0 +1,26 @@
+package rabbitmq
+
+import (
+	"log"
+
+	"github.com/streadway/amqp"
+)
+
+func Open(url string) (*amqp.Connection, *amqp.Channel, error) {
+	conn, err := amqp.Dial(url)
+	if err != nil {
+		return nil, nil, err
+	}
+
+	ch, err := conn.Channel()
+	if err != nil {
+		log.Printf("Failed to open a channel: %v\n", err)
+		return nil, nil, err
+	}
+
+	return conn, ch, nil
+}
+
+func Close(conn *amqp.Connection) {
+	conn.Close()
+}

rabbitmq/go.mod

@@ -0,0 +1,5 @@
+module git.pbiernat.dev/egommerce/go-api-pkg/rabbitmq
+
+go 1.18
+
+require github.com/streadway/amqp v1.0.0

rabbitmq/go.sum

@@ -0,0 +1,2 @@
+github.com/streadway/amqp v1.0.0 h1:kuuDrUJFZL1QYL9hUNuCxNObNzB0bV/ZG5jV3RWAQgo=
+github.com/streadway/amqp v1.0.0/go.mod h1:AZpEONHx3DKn8O/DFsRAY58/XVQiIPMTMB1SddzLXVw=

rabbitmq/queue.go

@@ -0,0 +1,85 @@
+package rabbitmq
+
+import (
+	"bytes"
+	"encoding/json"
+	"fmt"
+	"log"
+
+	"github.com/streadway/amqp"
+)
+
+type Message map[string]interface{}
+
+func Serialize(msg any) (string, error) {
+	var b bytes.Buffer
+	encoder := json.NewEncoder(&b)
+	err := encoder.Encode(msg)
+
+	return b.String(), err
+}
+
+func Deserialize(b []byte) (Message, error) {
+	var msg Message
+	buf := bytes.NewBuffer(b)
+	decoder := json.NewDecoder(buf)
+	err := decoder.Decode(&msg)
+
+	return msg, err
+}
+
+func NewExchange(chn *amqp.Channel, name string) error {
+	err := chn.ExchangeDeclare(
+		name,
+		"direct", // type
+		true,     // durable
+		false,    // auto-deleted
+		false,    // internal
+		false,    // no-wait
+		nil,      // arguments
+	)
+
+	if err != nil {
+		return err
+	}
+
+	return nil
+}
+
+func Publish(chn *amqp.Channel, name, routingKey string, msg any) error {
+	jsonData, err := Serialize(msg)
+	if err != nil {
+		return err
+	}
+
+	msgBody := fmt.Sprintf(`{"event":"%T","data":%s}`, msg, jsonData)
+	chn.Publish(
+		name,       // exchange name
+		routingKey, // routing key
+		false,      // mandatory
+		false,      // immediate
+		amqp.Publishing{
+			ContentType: "application/json",
+			Body:        []byte(msgBody),
+		},
+	)
+
+	return nil
+}
+
+func BindQueueToExchange(chn *amqp.Channel, queueName, exchName, routingKey string) error {
+	err := chn.QueueBind(
+		queueName,  // queue name
+		routingKey, // routing key
+		exchName,   // exchange name
+		false,
+		nil,
+	)
+	if err != nil {
+		log.Printf("Failed to bind a queue: %s\n", queueName)
+
+		return err
+	}
+
+	return nil
+}