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rabbit.go
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rabbit.go
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package rabbit
import (
"fmt"
"github.com/google/uuid"
"github.com/streadway/amqp"
)
type mq struct {
conn *amqp.Connection
url string
channel *amqp.Channel
consumers []*consumer
}
type consumer struct {
queueName string
consumerTag string
done chan error
}
func NewMq() MQ {
return &mq{}
}
func (m *mq) Connect(url string) error {
var err error
m.conn, err = amqp.Dial(url)
if err != nil {
return fmt.Errorf("failed to connect to RabbitMQ: %s", err)
}
m.channel, err = m.conn.Channel()
if err != nil {
return fmt.Errorf("failed to open a channel: %s", err)
}
m.url = url
return nil
}
func (m *mq) CreateQueue(name string) error {
_, err := m.channel.QueueDeclare(
name, // name
true, // durable
false, // delete when unused
false, // exclusive
false, // no-wait
nil, // arguments
)
if err != nil {
return fmt.Errorf("failed to declare a queue: %s", err)
}
return nil
}
func (m *mq) Send(queueName string, message string) error {
ch, err := m.conn.Channel()
if err != nil {
// if the channel is closed, try to reconnect to the server
if err == amqp.ErrClosed {
if err := m.Connect(m.url); err != nil {
return err
}
ch, err = m.conn.Channel()
if err != nil {
return err
}
} else {
return err
}
}
defer ch.Close()
err = ch.Publish(
"",
queueName,
false,
false,
amqp.Publishing{
ContentType: "text/plain",
Body: []byte(message),
},
)
if err != nil {
return err
}
return nil
}
func (m *mq) Receive(queueName string) (string, error) {
msgs, err := m.channel.Consume(
queueName,
"",
true,
false,
false,
false,
nil,
)
if err != nil {
return "", fmt.Errorf("failed to register a consumer: %s", err)
}
for msg := range msgs {
return string(msg.Body), nil
}
return "", nil
}
func (m *mq) AddConsumer(num int, queueName string, consumerName string, callback func([]byte)) error {
for i := 0; i < num; i++ {
c := &consumer{
queueName: queueName,
consumerTag: consumerName,
done: make(chan error),
}
delivery, err := m.channel.Consume(
queueName,
consumerName+uuid.NewString(),
false,
false,
false,
false,
nil,
)
if err != nil {
return fmt.Errorf("failed to register a consumer: %s", err)
}
go func() {
for d := range delivery {
callback(d.Body)
_ = d.Ack(false)
}
c.done <- nil
}()
m.consumers = append(m.consumers, c)
}
return nil
}
func (m *mq) Close() error {
if m.conn != nil {
return m.conn.Close()
}
return nil
}