54 lines
1.1 KiB
Go
54 lines
1.1 KiB
Go
package rabbitmq
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import (
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"log"
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amqp "github.com/rabbitmq/amqp091-go"
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)
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const (
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DLXExchange = "dlx.events"
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MaxRetryCount = 3
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)
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// DeclareDLX 声明死信交换机和对应的死信队列
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func DeclareDLX(ch *amqp.Channel, queueName string) error {
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if ch == nil {
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return nil
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}
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if err := ch.ExchangeDeclare(
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DLXExchange, "topic", true, false, false, false, nil,
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); err != nil {
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return err
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}
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dlxQueue := queueName + ".dlx"
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_, err := ch.QueueDeclare(
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dlxQueue, true, false, false, false, nil,
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)
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if err != nil {
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return err
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}
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if err := ch.QueueBind(dlxQueue, "#", DLXExchange, false, nil); err != nil {
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return err
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}
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log.Printf("DLX ready: exchange=%s queue=%s", DLXExchange, dlxQueue)
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return nil
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}
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// GetRetryCount 从 AMQP x-death header 中提取当前消息已被重试的次数
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func GetRetryCount(d amqp.Delivery) int {
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deaths, ok := d.Headers["x-death"].([]interface{})
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if !ok || len(deaths) == 0 {
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return 0
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}
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death, ok := deaths[0].(amqp.Table)
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if !ok {
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return 0
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}
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count, ok := death["count"].(int64)
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if !ok {
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return 0
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}
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return int(count)
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}
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