# **pack.ag/amqp**

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pack.ag/amqp is an AMQP 1.0 client implementation for Go.

[AMQP 1.0](http://docs.oasis-open.org/amqp/core/v1.0/os/amqp-core-overview-v1.0-os.html) is not compatible with AMQP 0-9-1 or 0-10, which are
the most common AMQP protocols in use today. A list of AMQP 1.0 brokers and other
AMQP 1.0 resources can be found at [github.com/xinchen10/awesome-amqp](https://github.com/xinchen10/awesome-amqp).

This library aims to be stable and worthy of production usage, but the API is still subject to change. To conform with SemVer, the major version will remain 0 until the API is deemed stable. During this period breaking changes will be indicated by bumping the minor version. Non-breaking changes will bump the patch version.

## Install

```
go get -u pack.ag/amqp
```

## Contributing

Contributions are welcome! Please see [CONTRIBUTING.md](CONTRIBUTING.md).

## Example Usage

``` go
package main

import (
	"context"
	"fmt"
	"log"
	"time"

	"pack.ag/amqp"
)

func main() {
	// Create client
	client, err := amqp.Dial("amqps://my-namespace.servicebus.windows.net",
		amqp.ConnSASLPlain("access-key-name", "access-key"),
	)
	if err != nil {
		log.Fatal("Dialing AMQP server:", err)
	}
	defer client.Close()

	// Open a session
	session, err := client.NewSession()
	if err != nil {
		log.Fatal("Creating AMQP session:", err)
	}

	ctx := context.Background()

	// Send a message
	{
		// Create a sender
		sender, err := session.NewSender(
			amqp.LinkTargetAddress("/queue-name"),
		)
		if err != nil {
			log.Fatal("Creating sender link:", err)
		}

		ctx, cancel := context.WithTimeout(ctx, 5*time.Second)

		// Send message
		err = sender.Send(ctx, amqp.NewMessage([]byte("Hello!")))
		if err != nil {
			log.Fatal("Sending message:", err)
		}

		sender.Close(ctx)
		cancel()
	}

	// Continuously read messages
	{
		// Create a receiver
		receiver, err := session.NewReceiver(
			amqp.LinkSourceAddress("/queue-name"),
			amqp.LinkCredit(10),
		)
		if err != nil {
			log.Fatal("Creating receiver link:", err)
		}
		defer func() {
			ctx, cancel := context.WithTimeout(ctx, 1*time.Second)
			receiver.Close(ctx)
			cancel()
		}()

		for {
			// Receive next message
			msg, err := receiver.Receive(ctx)
			if err != nil {
				log.Fatal("Reading message from AMQP:", err)
			}

			// Accept message
			msg.Accept()

			fmt.Printf("Message received: %s\n", msg.GetData())
		}
	}
}
```

## Related Projects

| Project | Description |
|---------|-------------|
| [github.com/Azure/azure-event-hubs-go](https://github.com/Azure/azure-event-hubs-go) * | Library for interacting with Microsoft Azure Event Hubs. |
| [github.com/Azure/azure-service-bus-go](https://github.com/Azure/azure-service-bus-go) * | Library for interacting with Microsoft Azure Service Bus. |
| [gocloud.dev/pubsub](https://gocloud.dev/pubsub) * | Library for portably interacting with Pub/Sub systems. |
| [qpid-proton](https://github.com/apache/qpid-proton/tree/go1) | AMQP 1.0 library using the Qpid Proton C bindings. |

`*` indicates that the project uses this library.

Feel free to send PRs adding additional projects. Listed projects are not limited to those that use this library as long as they are potentially useful to people who are looking at an AMQP library.

### Other Notes

By default, this package depends only on the standard library. Building with the
`pkgerrors` tag will cause errors to be created/wrapped by the github.com/pkg/errors
library. This can be useful for debugging and when used in a project using
github.com/pkg/errors.
