Wildfire Log Adapter for Solar

While doing some more development for Crindigan, I figured I should be looking for a better way to show debug information than putting it in the page footer, so I looked at FirePHP. Unfortunately the Firephp log adapter in Solar was out of date, so I wrote a quick adapter that uses the newer Wildfire protocol.

/**
 * Log adapter that works with the latest FirePHP version
 * (probably not FireConsole though, whenever it's released).
 *
 * @package Crindigan
 * @author Steven Harris
 * @license http://opensource.org/licenses/bsd-license.php BSD
 * @version $Id$
 */
class Rpg_Log_Adapter_Wildfire extends Solar_Log_Adapter {

    /**
     * Default configuration values.
     *
     * @config string|array events The event types this instance
     *   should recognize; a comma-separated string of events, or
     *   a sequential array.  Default is all events ('*').
     *
     * @config dependency response A Solar_Http_Response dependency injection.
     *
     * @var array
     *
     */
    protected $_Rpg_Log_Adapter_Wildfire = array(
        'events'   => '*',
        'response' => 'response',
    );

    /**
     * The Solar_Http_Response where headers will be sent.
     *
     * @var Solar_Http_Response
     */
    protected $_response;

    /**
     * The Solar_Json instance used to encode JSON for Wildfire.
     *
     * @var Solar_Json
     */
    protected $_json;

    /**
     * Wildfire header index to keep headers in sequential order.
     *
     * @var int
     */
    protected $_index = 0;

    /**
     * Post-construction tasks. Sets up the response, JSON, and default Wildfire headers.
     */
    protected function _postConstruct() {
        parent::_postConstruct();

        $this->_response = Solar::dependency('Solar_Http_Response', $this->_config['response']);

        $this->_json = Solar::factory('Solar_Json');

		$this->_response->setHeader('X-Wf-Protocol-1', 'http://meta.wildfirehq.org/Protocol/JsonStream/0.2');
        $this->_response->setHeader('X-Wf-1-Plugin-1', 'http://meta.firephp.org/Wildfire/Plugin/FirePHP/Library-FirePHPCore/0.3');
        $this->_response->setHeader('X-Wf-1-Structure-1', 'http://meta.firephp.org/Wildfire/Structure/FirePHP/FirebugConsole/0.1');
    }

    /**
     * Writes the log message to FirePHP.
     *
     * @param  string $class Class name.
     * @param  string $event Event name.
     * @param  mixed  $descr Log data. Any data type should work, assuming it can be encoded as JSON.
     * @return bool Always true.
     */
    protected function _save($class, $event, $descr) {
    	$meta = array();
    	$meta['Type']  = 'LOG';
    	$meta['Label'] = "$class-$event";

    	$data = $this->_json->encode(array($meta, $descr));
    	$len  = strlen($data);

		if ( strlen($data) <= 4990 ) {
			$this->_index++;
			$this->_response->setHeader("X-Wf-1-1-1-{$this->_index}", "$len|$data|");
		} else {
			$chunks = chunk_split($data, 4990, "\n");
			$parts = explode("\n", $chunks);
            $num_parts = count($parts);
            for ( $i = 0; $i < $num_parts; $i++ ) {
				$this->_index++;
				$this->_response->setHeader("X-Wf-1-1-1-{$this->_index}",
					($i == 0 ? $len : '') . "|{$parts[$i]}|" . (($i == $num_parts - 1) ? '' : '\\'));
            }
        }

        return true;
    }
}