lithium\analysis\logger\adapter\Growl

class

The Growl logger implements support for the Growl notification system for Mac OS X. Writing to this logger will display small, customizable status messages on the screen.

Source

class Growl extends \lithium\core\Object {

	/**
	 * Array that maps `Logger` message priority names to Growl-compatible priority levels.
	 *
	 * @var array
	 */
	protected $_priorities = array(
		'emergency' => 2,
		'alert'     => 1,
		'critical'  => 1,
		'error'     => 1,
		'warning'   => 0,
		'notice'    => -1,
		'info'      => -2,
		'debug'     => -2
	);

	/**
	 * The Growl protocol version used to send messages.
	 */
	const PROTOCOL_VERSION = 1;

	/**
	 * There are two types of messages sent to Growl: one to register applications, and one to send
	 * notifications. This type registers the application with Growl's settings.
	 */
	const TYPE_REG = 0;

	/**
	 * This message type is for sending notifications to Growl.
	 */
	const TYPE_NOTIFY = 1;

	/**
	 * Holds the connection resource used to send messages to Growl.
	 *
	 * @var resource
	 */
	protected $_connection = null;

	/**
	 * Flag indicating whether the logger has successfully registered with the Growl server.
	 * Registration only needs to happen once, but may fail for several reasons, including inability
	 * to connect to the server, or the server requires a password which has not been specified.
	 *
	 * @var boolean
	 */
	protected $_registered = false;

	/**
	 * Allow the Growl connection resource to be auto-configured from constructor parameters.
	 *
	 * @var array
	 */
	protected $_autoConfig = array('connection', 'registered');

	/**
	 * Constructor. Growl logger constructor. Accepts an array of settings which are merged
	 * with the default settings and used to create the connection and handle notifications.
	 *
	 * @see lithium\analysis\Logger::write()
	 * @param array $config The settings to configure the logger. Available settings are as follows:
	 *        - `'name`' _string_: The name of the application as it should appear in Growl's
	 *          system settings. Defaults to the directory name containing your application.
	 *        - `'host'` _string_: The Growl host with which to communicate, usually your
	 *          local machine. Use this setting to send notifications to another machine on
	 *          the network. Defaults to `'127.0.0.1'`.
	 *        - `'port'` _integer_: Port of the host machine. Defaults to the standard Growl
	 *          port, `9887`.
	 *        - `'password'` _string_: Only required if the host machine requires a password.
	 *          If notification or registration fails, check this against the host machine's
	 *          Growl settings.
	 *        - '`protocol'` _string_: Protocol to use when opening socket communication to
	 *          Growl. Defaults to `'udp'`.
	 *        - `'title'` _string_: The default title to display when showing Growl messages.
	 *          The default value is the same as `'name'`, but can be changed on a per-message
	 *          basis by specifying a `'title'` key in the `$options` parameter of
	 *          `Logger::write()`.
	 *        - `'notification'` _array_: A list of message types you wish to register with
	 *          Growl to be able to send. Defaults to `array('Errors', 'Messages')`.
	 * @return void
	 */
	public function __construct(array $config = array()) {
		$name = basename(Libraries::get(true, 'path'));

		$defaults = compact('name') + array(
			'host'     => '127.0.0.1',
			'port'     => 9887,
			'password' => null,
			'protocol' => 'udp',
			'title'    => Inflector::humanize($name),
			'notifications' => array('Errors', 'Messages'),
			'registered' => false
		);
		parent::__construct($config + $defaults);
	}

	/**
	 * Writes `$message` to a new Growl notification.
	 *
	 * @param string $priority The `Logger`-based priority of the message. This value is mapped
	 *               to a Growl-specific priority value if possible.
	 * @param string $message Message to be shown.
	 * @param array $options Any options that are passed to the `notify()` method. See the
	 *              `$options` parameter of `notify()`.
	 * @return \Closure Function returning boolean `true` on successful write, `false` otherwise.
	 */
	public function write($priority, $message, array $options = array()) {
		$_self =& $this;
		$_priorities = $this->_priorities;

		return function($self, $params) use (&$_self, $_priorities) {
			$priority = 0;
			$options = $params['options'];

			if (isset($options['priority']) && isset($_priorities[$options['priority']])) {
				$priority = $_priorities[$options['priority']];
			}
			return $_self->notify($params['message'], compact('priority') + $options);
		};
	}

	/**
	 * Posts a new notification to the Growl server.
	 *
	 * @param string $description Message to be displayed.
	 * @param array $options Options consists of:
	 *        -'title': The title of the displayed notification. Displays the
	 *         name of the application's parent folder by default.
	 * @return boolean Always returns `true`.
	 */
	public function notify($description = '', $options = array()) {
		$this->_register();

		$defaults = array('sticky' => false, 'priority' => 0, 'type' => 'Messages');
		$options += $defaults + array('title' => $this->_config['title']);
		$type = $options['type'];
		$title = $options['title'];

		$message = compact('type', 'title', 'description') + array('app' => $this->_config['name']);
		$message = array_map('utf8_encode', $message);

		$flags = ($options['priority'] & 7) * 2;
		$flags = ($options['priority'] < 0) ? $flags |= 8 : $flags;
		$flags = ($options['sticky']) ? $flags | 256 : $flags;

		$params = array('c2n5', static::PROTOCOL_VERSION, static::TYPE_NOTIFY, $flags);
		$lengths = array_map('strlen', $message);

		$data = call_user_func_array('pack', array_merge($params, $lengths));
		$data .= join('', $message);
		$data .= pack('H32', md5($data . $this->_config['password']));

		$this->_send($data);
		return true;
	}

	/**
	 * Growl server connection registration and initialization.
	 *
	 * @return boolean True
	 */
	protected function _register() {
		if ($this->_registered) {
			return true;
		}
		$ct = count($this->_config['notifications']);
		$app = utf8_encode($this->_config['name']);
		$nameEnc = $defaultEnc = '';

		foreach ($this->_config['notifications'] as $i => $name) {
			$name = utf8_encode($name);
			$nameEnc .= pack('n', strlen($name)) . $name;
			$defaultEnc .= pack('c', $i);
		}
		$data = pack('c2nc2', static::PROTOCOL_VERSION, static::TYPE_REG, strlen($app), $ct, $ct);
		$data .= $app . $nameEnc . $defaultEnc;
		$checksum = pack('H32', md5($data . $this->_config['password']));
		$data .= $checksum;

		$this->_send($data);
		return $this->_registered = true;
	}

	/**
	 * Creates a connection to the Growl server using the protocol, host and port configurations
	 * specified in the constructor.
	 *
	 * @return resource Returns a connection resource created by `fsockopen()`.
	 */
	protected function _connection() {
		if ($this->_connection) {
			return $this->_connection;
		}
		$host = "{$this->_config['protocol']}://{$this->_config['host']}";

		if ($this->_connection = fsockopen($host, $this->_config['port'], $message, $code)) {
			return $this->_connection;
		}
		throw new NetworkException("Growl connection failed: (`{$code}`) `{$message}`.");
	}

	/**
	 * Sends binary data to the Growl server.
	 *
	 * @throws NetworkException Throws an exception if the server connection could not be written
	 *         to.
	 * @param string $data The raw binary data to send to the Growl server.
	 * @return boolean Always returns `true`.
	 */
	protected function _send($data) {
		if (fwrite($this->_connection(), $data, strlen($data)) === false) {
			throw new NetworkException('Could not send registration to Growl Server.');
		}
		return true;
	}

	/**
	 * Destructor. Closes and releases the socket connection to Growl.
	 *
	 * @return void
	 */
	public function __destruct() {
		if (is_resource($this->_connection)) {
			fclose($this->_connection);
			unset($this->_connection);
		}
	}
}