amqp

The AMQP (Advanced Message Queuing Protocol) package in Go is a wrapper for amqp091-go, offering a specific focus on stable and secure connection management. This package provides a high-level interface for interacting with RabbitMQ, emphasizing reliability and safety in connection handling. Key features include automatic reconnection strategies, a simplified API for creating consumers and publishers, and graceful connection closure. By wrapping amqp091-go with stability and safety in mind, this package facilitates robust and secure messaging in Go applications. Explore the documentation to leverage the power of AMQP with confidence in your projects.

Goals

• Reliable Reconnection Management: Develop a robust reconnection mechanism with a specific connection and channel manager running in the background. Ensure seamless and automatic re-establishment of connections in case of interruptions or failures.

• Concurrent Safe Message Consumption: Implement concurrent-safe methods for consuming messages, allowing multiple consumers to handle messages concurrently without conflicts. Ensure thread-safety in message consumption to support high-concurrency scenarios.

• Custom Publish Method with Retry Support: Design a custom publish method to provide flexibility in message publishing. Incorporate retry support in the publish mechanism to automatically retry failed message deliveries, enhancing message reliability.

• Consumer with Fault Tolerance: Develop a fault-tolerant consumer that can gracefully handle errors and exceptions during message processing. Implement mechanisms to handle and recover from faults, ensuring continuous and reliable message consumption.

• Auto Encoder (JSON, GOB, ProtoBuf): Automatically encode your message body with any type upon publishing. Then, upon consumption, automatically decode the message body into your variable."

Install

go get -u github.com/Ja7ad/amqp

Example Consumer

package main

import (
	"fmt"
	"github.com/Ja7ad/amqp"
	"github.com/Ja7ad/amqp/types"
	"log"
)

type Person struct {
	Name string `json:"name"`
	Age  int    `json:"age"`
}

type Greeting struct {
	Msg string `json:"msg"`
}

const (
	routingKeyPerson   = "person"
	routingKeyGreeting = "greeting"
)

func main() {
	done := make(chan struct{})

	b, err := amqp.New("uri")
	if err != nil {
		log.Fatal(err)
	}

	con, err := b.Consumer(
		&types.Exchange{
			Name:       "test",
			Kind:       types.Topic,
			Declare:    true,
			Passive:    false,
			Durable:    true,
			AutoDelete: false,
			Internal:   false,
			NoWait:     false,
			Arguments:  nil,
		},
		&types.Queue{
			Name:       "test",
			Declare:    true,
			Durable:    true,
			Passive:    false,
			Exclusive:  false,
			AutoDelete: false,
			NoWait:     false,
			Arguments:  nil,
		},
		&types.Consumer{
			Name:      "test1",
			AutoAck:   false,
			Exclusive: false,
			NoLocal:   false,
			NoWait:    false,
			Arguments: nil,
		},
		[]*types.RoutingKey{
			{
				Key:     "greeting",
				Declare: true,
			},
			{
				Key:     "person",
				Declare: true,
			},
		},
		handler,
		amqp.WithConcurrentConsumer(10),
	)

	if err := con.Start(); err != nil {
		log.Fatal(err)
	}

	<-done
}

func handler(routingKey string, msgFunc func(vPtr any) (types.Delivery, error)) types.Action {
	switch routingKey {
	case routingKeyPerson:
		person := new(Person)
		msg, err := msgFunc(person)
		if err != nil {
			fmt.Println(err)
			return types.NackDiscard
		}

		fmt.Printf("routingKey: %s, msg: %v\n", msg.RoutingKey, person)
		return types.Ack
	case routingKeyGreeting:
		greeting := new(Greeting)
		msg, err := msgFunc(greeting)
		if err != nil {
			fmt.Println(err)
			return types.NackDiscard
		}

		fmt.Printf("routingKey: %s, msg: %v\n", msg.RoutingKey, greeting)
		return types.Ack
	default:
		return types.Reject
	}

}

Example Publisher

package main

import (
	"fmt"
	"github.com/Ja7ad/amqp"
	"github.com/Ja7ad/amqp/types"
	"log"
	"time"
)

type Person struct {
	Name string `json:"name"`
	Age  int    `json:"age"`
}

type Greeting struct {
	Msg string `json:"msg"`
}

const (
	routingKeyPerson   = "person"
	routingKeyGreeting = "greeting"
)

func main() {
	rb, err := amqp.New("uri")
	if err != nil {
		log.Fatal(err)
	}

	pub, err := rb.Publisher(&types.Exchange{
		Name:       "test",
		Kind:       types.Topic,
		Declare:    true,
		Passive:    false,
		Durable:    true,
		AutoDelete: false,
		Internal:   false,
		NoWait:     false,
		Arguments:  nil,
	}, false)
	if err != nil {
		log.Fatal(err)
	}

	person := &Person{
		Name: "javad",
		Age:  30,
	}

	if err := pub.Publish(false, false, types.Publishing{
		DeliveryMode: types.Persistent,
		Body:         person,
	}, routingKeyPerson); err != nil {
		log.Fatal(err)
	}

	greeting := &Greeting{
		Msg: "foobar",
	}

	if err := pub.Publish(false, false, types.Publishing{
		DeliveryMode: types.Persistent,
		Body:         greeting,
	}, routingKeyGreeting); err != nil {
		log.Fatal(err)
	}
}