clue/ami-react

Simple async, event-driven access to the Asterisk Manager Interface (AMI)

The Asterisk PBX is a popular open source telephony solution that offers a wide range of telephony features. The Asterisk Manager Interface (AMI) allows you to control and monitor the PBX. Among others, it can be used to originate a new call, execute Asterisk commands or monitor the status of subscribers, channels or queues.

• Async execution of Actions - Send any number of actions (commands) to the asterisk in parallel and process their responses as soon as results come in. The Promise-based design provides a sane interface to working with out of bound responses.
• Event-driven core - Register your event handler callbacks to react to incoming events, such as an incoming call or a change in a subscriber state.
• Lightweight, SOLID design - Provides a thin abstraction that is just good enough and does not get in your way. Future or custom actions and events require no changes to be supported.
• Good test coverage - Comes with an automated tests suite and is regularly tested against versions as old as Asterisk 1.8+

Note: This project is in beta stage! Feel free to report any issues you encounter.

Quickstart example

Once installed, you can use the following code to access your local Asterisk Telephony instance and issue some simple commands via AMI:

$factory = new Factory($loop);

$factory->createClient('user:secret@localhost')->then(function (Client $client) {
    echo 'Client connected' . PHP_EOL;
    
    $api = new Api($client);
    $api->listCommands()->then(function (Response $response) {
        echo 'Available commands:' . PHP_EOL;
        var_dump($response);
    });
});

$loop->run();

See also the examples.

Usage

Factory

The Factory is responsible for creating your Client instance. It also registers everything with the main EventLoop.

$loop = \React\EventLoop\Factory::create();
$factory = new Factory($loop);

The createClient($amiUrl) method can be used to create a new Client. It helps with establishing a plain TCP/IP or secure SSL connection to the AMI and issuing an initial login action.

$factory->createClient('user:secret@localhost')->then(
    function (Client $client) {
        // client connected and authenticated
    },
    function (Exception $e) {
        // an error occured while trying to connect or authorize client
    }
);

Note: The given $amiUrl must include a host, it should include a username and secret and it can include a scheme (tcp/ssl) and port definition.

Client

The Client is responsible for exchanging messages with the Asterisk Manager Interface and keeps track of pending actions.

The on($eventName, $eventHandler) method can be used to register a new event handler. Incoming events and errors will be forwarded to registered event handler callbacks:

$client->on('event', function (Event $event) {
    // process an incoming AMI event (see below)
});
$client->on('close', function () {
    // the connection to the AMI just closed
});
$client->on('error', function (Exception $e) {
    // and error has just been detected, the connection will terminate...
});

The close() method can be used to force-close the AMI connection and reject all pending actions.

The end() method can be used to soft-close the AMI connection once all pending actions are completed.

Advanced: Creating Action objects, sending them via AMI and waiting for incoming Response objects is usually hidden behind the Api interface.

If you happen to need a custom or otherwise unsupported action, you can also do so manually as follows. Consider filing a PR though :)

The createAction($name, $fields) method can be used to construct a custom AMI action. A unique ActionID will be added automatically (needed to match incoming responses).

The request(Action $action) method can be used to queue the given messages to be sent via AMI and wait for a Response object that matches its ActionID.

Api

The Api wraps a given Client instance to provide a simple way to execute common actions.

$api = new Api($client);

$api->ping()->then(function (Response $response) {
    // response received for ping action
});

All public methods resemble their respective AMI actions. Listing all available actions is out of scope here, please refer to the class outline.

Sending actions is async (non-blocking), so you can actually send multiple action requests in parallel. The AMI will respond to each action with a Response object. The order is not guaranteed. Sending actions uses a Promise-based interface that makes it easy to react to when an action is fulfilled (i.e. either successfully resolved or rejected with an error):

$api->ping()->then(
    function (Response $response) {
        // response received for ping action
    },
    function (Exception $e) {
        // an error occured while executing the action
        
        if ($e instanceof ErrorException) {
            // we received a valid error response (such as authorization error)
            $response = $e->getResponse();
        } else {
            // we did not receive a valid response (likely a transport issue)
        }
    }
});

Advanced: Using the Api is not strictly necessary, but is the recommended way to execute common actions.

If you happen to need a new or otherwise unsupported action, or additional arguments, you can also do so manually. See the advanced Client usage above for details. A PR that updates the API is very much appreciated :)

Message

The Message is an abstract base class for the Response, Action and Event value objects. It provides a common interface for these three message types.

Each Message consists of any number of fields with each having a name and one or multiple values. Field names are matched case-insensitive. The interpretation of values is application specific.

The getFieldValue($key) method can be used to get the first value for the given field key. If no value was found, null is returned.

The getFieldValues($key) method can be used to get a list of all values for the given field key. If no value was found, an empty array() is returned.

The getFields() method can be used to get an array of all fields.

The getActionId() method is a shortcut for accessing the value of the "ActionID" field.

Response

The Response value object represents the incoming response received from the AMI.

Action

The Action value object represents an outgoing action messages to be sent to the AMI.

Event

The Event value object represents the incoming event received from the AMI.

The getName() method can be used to get the name of the event. This is a shortcut to get the value of the "Event" field.

Install

The recommended way to install this library is through composer. New to composer?

{
    "require": {
        "clue/ami-react": "~0.2.0"
    }
}

License

MIT