* SS_Log::add_writer(new SS_LogEmailWriter('my@email.com'), SS_Log::ERR);
*
*
* Example usage of logging errors by file:
*
* SS_Log::add_writer(new SS_LogFileWriter('/var/log/silverstripe/errors.log'), SS_Log::ERR);
*
*
* Example usage of logging at warnings and errors by setting the priority to '<=':
*
* SS_Log::add_writer(new SS_LogEmailWriter('my@email.com'), SS_Log::WARN, '<=');
*
*
* Each writer object can be assigned a formatter. The formatter is
* responsible for formatting the message before giving it to the writer.
* {@link SS_LogErrorEmailFormatter} is such an example that formats errors
* into HTML for human readability in an email client.
*
* Formatters are added to writers like this:
*
* $logEmailWriter = new SS_LogEmailWriter('my@email.com');
* $myEmailFormatter = new MyLogEmailFormatter();
* $logEmailWriter->setFormatter($myEmailFormatter);
*
*
* @package sapphire
* @subpackage dev
*/
class SS_Log {
const ERR = Zend_Log::ERR;
const WARN = Zend_Log::WARN;
const NOTICE = Zend_Log::NOTICE;
/**
* Logger class to use.
* @see SS_Log::get_logger()
* @var string
*/
public static $logger_class = 'SS_ZendLog';
/**
* @see SS_Log::get_logger()
* @var object
*/
protected static $logger;
/**
* Get the logger currently in use, or create a new
* one if it doesn't exist.
*
* @return object
*/
public static function get_logger() {
if(!self::$logger) {
self::$logger = new self::$logger_class;
}
return self::$logger;
}
/**
* Get all writers in use by the logger.
* @return array Collection of Zend_Log_Writer_Abstract instances
*/
public static function get_writers() {
return self::get_logger()->getWriters();
}
/**
* Remove all writers currently in use.
*/
public static function clear_writers() {
self::get_logger()->clearWriters();
}
/**
* Remove a writer instance from the logger.
* @param object $writer Zend_Log_Writer_Abstract instance
*/
public static function remove_writer($writer) {
self::get_logger()->removeWriter($writer);
}
/**
* Add a writer instance to the logger.
* @param object $writer Zend_Log_Writer_Abstract instance
* @param const $priority Priority. Possible values: SS_Log::ERR, SS_Log::WARN or SS_Log::NOTICE
* @param $comparison Priority comparison operator. Acts on the integer values of the error
* levels, where more serious errors are lower numbers. By default this is "=", which means only
* the given priority will be logged. Set to "<=" if you want to track errors of *at least*
* the given priority.
*/
public static function add_writer($writer, $priority = null, $comparison = '=') {
if($priority) $writer->addFilter(new Zend_Log_Filter_Priority($priority, $comparison));
self::get_logger()->addWriter($writer);
}
/**
* Dispatch a message by priority level.
*
* The message parameter can be either a string (a simple error
* message), or an array of variables. The latter is useful for passing
* along a list of debug information for the writer to handle, such as
* error code, error line, error context (backtrace).
*
* @param mixed $message Exception object or array of error context variables
* @param const $priority Priority. Possible values: SS_Log::ERR, SS_Log::WARN or SS_Log::NOTICE
*/
public static function log($message, $priority) {
if($message instanceof Exception) {
$message = array(
'errno' => '',
'errstr' => $message->getMessage(),
'errfile' => $message->getFile(),
'errline' => $message->getLine(),
'errcontext' => $message->getTrace()
);
}
try {
self::get_logger()->log($message, $priority);
} catch(Exception $e) {
// @todo How do we handle exceptions thrown from Zend_Log?
// For example, an exception is thrown if no writers are added
}
}
}