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<?php
/**
* Akeeba Engine
* The modular PHP5 site backup engine
*
* @copyright Copyright (c)2006-2016 Nicholas K. Dionysopoulos
* @license GNU GPL version 3 or, at your option, any later version
* @package akeebaengine
*
*/
// Protection against direct access
defined('AKEEBAENGINE') or die();
/**
* This is Akeeba Engine's heart. Kettenrad is reponsible for launching the
* domain chain of a backup job.
*/
final class AliceCoreKettenrad extends AliceAbstractPart
{
/** @var array Cached copy of the response array */
private $array_cache = null;
/** @var array The list of remaining steps */
private $domain_chain = array();
/** @var string The current domain's name */
private $domain = '';
/**@ var string The active domain's class name */
private $class = '';
/** @var string The current backup's tag (actually: the backup's origin) */
private $tag = null;
/** @var int How many steps the domain_chain array contained when the backup began. Used for percentage calculations. */
private $total_steps = 0;
/**
* Returns the current backup tag. If none is specified, it sets it to be the
* same as the current backup origin and returns the new setting.
*
* @return string
*/
public function getTag()
{
if (empty($this->tag))
{
$this->tag = 'alice';
}
return $this->tag;
}
protected function _prepare()
{
// Intialize the timer class
$timer = AliceFactory::getTimer();
// Do we have a tag?
if ( !empty($this->_parametersArray['tag']))
{
$this->tag = $this->_parametersArray['tag'];
}
// Save the log to analyze
$registry = AliceFactory::getConfiguration();
$registry->set('volatile.alice.logToAnalyze', $this->_parametersArray['logToAnalyze']);
// Make sure a tag exists (or create a new one)
$this->tag = $this->getTag();
// Reset the log
AliceUtilLogger::openLog($this->tag);
AliceUtilLogger::ResetLog($this->tag);
set_error_handler('aliceBackupErrorHandler');
// Reset the storage
AliceUtilTempvars::reset($this->tag);
// Get the domain chain
$this->domain_chain = AliceUtilScripting::getDomainChain();
$this->total_steps = count($this->domain_chain) - 1; // Init shouldn't count in the progress bar
// Mark this engine for Nesting Logging
$this->nest_logging = true;
// Preparation is over
$this->array_cache = null;
$this->setState('prepared');
//restore_error_handler();
}
protected function _run()
{
AliceUtilLogger::openLog($this->tag);
set_error_handler('aliceBackupErrorHandler');
// Maybe we're already done or in an error state?
if (($this->getError()) || ($this->getState() == 'postrun'))
{
return;
}
// Set running state
$this->setState('running');
// Initialize operation counter
$registry = AliceFactory::getConfiguration();
$registry->set('volatile.operation_counter', 0);
// Advance step counter
$stepCounter = $registry->get('volatile.step_counter', 0);
$registry->set('volatile.step_counter', ++$stepCounter);
// Log step start number
AliceUtilLogger::WriteLog(_AE_LOG_DEBUG, '====== Starting Step number ' . $stepCounter . ' ======');
$timer = AliceFactory::getTimer();
$finished = false;
$error = false;
$breakFlag = false; // BREAKFLAG is optionally passed by domains to force-break current operation
// Apply an infinite time limit if required
if ($registry->get('akeeba.tuning.settimelimit', 0))
{
if (function_exists('set_time_limit'))
{
set_time_limit(0);
}
}
$this->array_cache = null;
// Loop until time's up, we're done or an error occurred, or BREAKFLAG is set
while (($timer->getTimeLeft() > 0) && ( !$finished) && ( !$error) && ( !$breakFlag))
{
// Reset the break flag
$registry->set('volatile.breakflag', false);
// Do we have to switch domains? This only happens if there is no active
// domain, or the current domain has finished
$have_to_switch = false;
if ($this->class == '')
{
$have_to_switch = true;
}
else
{
$object = AliceFactory::getDomainObject($this->class);
if ( !is_object($object))
{
$have_to_switch = true;
}
else
{
if ( !in_array('getState', get_class_methods($object)))
{
$have_to_switch = true;
}
else
{
if ($object->getState() == 'finished')
{
$have_to_switch = true;
}
}
}
}
// Switch domain if necessary
if ($have_to_switch)
{
// TODO Check what's the most conservative value and use it
if ( !AliceFactory::getConfiguration()->get('akeeba.tuning.nobreak.domains', 0))
{
AliceUtilLogger::WriteLog(_AE_LOG_DEBUG, "Kettenrad :: BREAKING STEP BEFORE SWITCHING DOMAIN");
$registry->set('volatile.breakflag', true);
}
$object = null; // Free last domain
if (empty($this->domain_chain))
{
// Aw, we're done! No more domains to run.
$this->setState('postrun');
AliceUtilLogger::WriteLog(_AE_LOG_DEBUG, "Kettenrad :: No more domains to process");
$this->array_cache = null;
//restore_error_handler();
return;
}
// Shift the next definition off the stack
$this->array_cache = null;
$new_definition = array_shift($this->domain_chain);
if (array_key_exists('class', $new_definition))
{
$this->domain = $new_definition['domain'];
$this->class = $new_definition['class'];
// Get a working object
$object = AliceFactory::getDomainObject($this->class);
$object->setup($this->_parametersArray);
}
else
{
AliceUtilLogger::WriteLog(_AE_LOG_WARNING, "Kettenrad :: No class defined trying to switch domains. The analysis will crash.");
$this->domain = null;
$this->class = null;
}
}
else
{
if ( !is_object($object))
{
$object = AliceFactory::getDomainObject($this->class);
}
}
// Tick the object
$result = $object->tick();
// Propagate errors
$this->propagateFromObject($object);
// Advance operation counter
$currentOperationNumber = $registry->get('volatile.operation_counter', 0);
$currentOperationNumber++;
$registry->set('volatile.operation_counter', $currentOperationNumber);
// Process return array
$this->setDomain($this->domain);
$this->setStep($result['Step']);
$this->setSubstep($result['Substep']);
// Check for BREAKFLAG
$breakFlag = $registry->get('volatile.breakflag', false);
// Process errors
$error = false;
if ($this->getError())
{
$error = true;
}
// Check if the backup procedure should finish now
$finished = $error ? true : !($result['HasRun']);
// Log operation end
AliceUtilLogger::WriteLog(_AE_LOG_DEBUG, '----- Finished operation ' . $currentOperationNumber . ' ------');
} // while
// Log the result
if ( !$error)
{
AliceUtilLogger::WriteLog(_AE_LOG_DEBUG, "Successful Smart algorithm on " . get_class($object));
}
else
{
AliceUtilLogger::WriteLog(_AE_LOG_ERROR, "Failed Smart algorithm on " . get_class($object));
}
// Log if we have to do more work or not
if ( !is_object($object))
{
AliceUtilLogger::WriteLog(_AE_LOG_WARNING, "Kettenrad :: Empty object found when processing domain '" . $this->domain . "'. This should never happen.");
}
else
{
if ($object->getState() == 'running')
{
AliceUtilLogger::WriteLog(_AE_LOG_DEBUG, "Kettenrad :: More work required in domain '" . $this->domain . "'");
// We need to set the break flag for the part processing to not batch successive steps
$registry->set('volatile.breakflag', true);
}
elseif ($object->getState() == 'finished')
{
AliceUtilLogger::WriteLog(_AE_LOG_DEBUG, "Kettenrad :: Domain '" . $this->domain . "' has finished.");
$registry->set('volatile.breakflag', false);
}
}
// Log step end
AliceUtilLogger::WriteLog(_AE_LOG_DEBUG, '====== Finished Step number ' . $stepCounter . ' ======');
if ( !$registry->get('akeeba.tuning.nobreak.domains', 0))
{
// Force break between steps
$registry->set('volatile.breakflag', true);
}
//restore_error_handler();
}
protected function _finalize()
{
// Open the log
AliceUtilLogger::openLog($this->tag);
//set_error_handler('aliceBackupErrorHandler');
// Kill the cached array
$this->array_cache = null;
// Remove the memory file
AliceUtilTempvars::reset($this->tag);
// All done.
AliceUtilLogger::WriteLog(_AE_LOG_DEBUG, "Kettenrad :: Just finished");
$this->setState('finished');
//restore_error_handler();
}
/**
* Saves the whole factory to temporary storage
*/
public static function save($tag = null)
{
$kettenrad = AliceFactory::getKettenrad();
if (empty($tag))
{
$kettenrad = AliceFactory::getKettenrad();
$tag = $kettenrad->tag;
}
$ret = $kettenrad->getStatusArray();
if ($ret['HasRun'] == 1)
{
AliceUtilLogger::WriteLog(_AE_LOG_DEBUG, "Will not save a finished Kettenrad instance");
}
else
{
AliceUtilLogger::WriteLog(_AE_LOG_DEBUG, "Saving Kettenrad instance $tag");
// Save a Factory snapshot:
AliceUtilTempvars::set(AliceFactory::serialize(), $tag);
}
}
/**
* Loads the factory from the storage (if it exists) and returns a reference to the
* Kettenrad object.
*
* @param null $tag
*
* @return AliceCoreKettenrad A reference to the Kettenrad object
*/
public static function &load($tag = null)
{
if ( !$tag)
{
$tag = 'alice';
}
AliceUtilLogger::openLog($tag);
AliceUtilLogger::WriteLog(_AE_LOG_DEBUG, "Kettenrad :: Attempting to load from file");
$serialized_factory = AliceUtilTempvars::get($tag);
if ($serialized_factory !== false)
{
AliceUtilLogger::WriteLog(_AE_LOG_DEBUG, " -- Loaded stored Alice Factory");
AliceFactory::unserialize($serialized_factory);
}
else
{
// There is no serialized factory. Nuke the in-memory factory.
AliceUtilLogger::WriteLog(_AE_LOG_DEBUG, " -- Stored Alice Factory not found - hard reset");
AliceFactory::nuke();
}
unset($serialized_factory);
return AliceFactory::getKettenrad();
}
/**
* Resets the Kettenrad state, wipping out any pending backups and/or stale
* temporary data.
*
* @param array $config Configuration parameters for the reset operation
*/
public static function reset($config = array())
{
$default_config = array(
'log' => false, // Log our actions
'maxrun' => 0, // Consider "pending" backups as failed after this much seconds
);
$config = (object)array_merge($default_config, $config);
// Pause logging if so desired
AliceUtilLogger::WriteLog(_AE_LOG_INFO, 'Resetting Kettenrad instance');
if ( !$config->log)
{
AliceUtilLogger::WriteLog(false, '');
}
// Cache the factory before proceeding
$factory = AliceFactory::serialize();
// @todo Here should happen all reset logic when we start another analysis
// Reload the factory
AliceFactory::unserialize($factory);
unset($factory);
// Unpause logging if it was previously paused
if ( !$config->log)
{
AliceUtilLogger::WriteLog(true, '');
}
AliceUtilLogger::WriteLog(_AE_LOG_INFO, 'Done resetting Kettenrad instance');
}
/**
* Returns a copy of the class's status array
*
* @return array
*/
public function getStatusArray()
{
if (empty($this->array_cache))
{
// Get the default table
$array = $this->_makeReturnTable();
// Translate HasRun to what the rest of the suite expects
$array['HasRun'] = ($this->getState() == 'finished') ? 1 : 0;
// Translate no errors
$array['Error'] = ($array['Error'] == false) ? '' : $array['Error'];
$array['Progress'] = $this->getProgress();
$this->array_cache = $array;
}
return $this->array_cache;
}
/**
* Gets the percentage of the backup process done so far.
*
* @return string
*/
public function getProgress()
{
// Get the overall percentage (based on domains complete so far)
$remaining_steps = count($this->domain_chain);
$remaining_steps++;
$overall = 1 - ($remaining_steps / $this->total_steps);
// How much is this step worth?
$this_max = 1 / $this->total_steps;
// Get the percentage done of the current object
if ( !empty($this->class))
{
$object = AliceFactory::getDomainObject($this->class);
}
else
{
$object = null;
}
if ( !is_object($object))
{
$local = 0;
}
else
{
$local = $object->getProgress();
}
$percentage = (int)(100 * ($overall + $local * $this_max));
if ($percentage < 0)
{
$percentage = 0;
}
if ($percentage > 100)
{
$percentage = 100;
}
return $percentage;
}
}
/**
* Timeout error handler
*/
if ( !function_exists('deadOnTimeOutAlice'))
{
function deadOnTimeOutAlice()
{
if (connection_status() == 1)
{
AliceUtilLogger::WriteLog(_AE_LOG_ERROR, 'The process was aborted on user\'s request');
}
if (connection_status() >= 2)
{
AliceUtilLogger::WriteLog(_AE_LOG_ERROR, \Akeeba\Engine\Platform::getInstance()
->translate('COM_AKEEBA_BACKUP_ERR_KETTENRAD_TIMEOUT'));
}
}
register_shutdown_function("deadOnTimeOutAlice");
}
/**
* Nifty trick to track and log PHP errors to Akeeba Backup's log
*
* @param int $errno
* @param string $errstr
* @param string $errfile
* @param int $errline
*
* @return bool
*/
function aliceBackupErrorHandler($errno, $errstr, $errfile, $errline)
{
// Sanity check
if ( !function_exists('error_reporting'))
{
return false;
}
// Do not proceed if the error springs from an @function() construct, or if
// the overall error reporting level is set to report no errors.
$error_reporting = error_reporting();
if ($error_reporting == 0)
{
return false;
}
switch ($errno)
{
case E_ERROR:
case E_USER_ERROR:
// Can I really catch fatal errors? It doesn't seem likely...
AliceUtilLogger::WriteLog(_AE_LOG_ERROR, "PHP FATAL ERROR on line $errline in file $errfile:");
AliceUtilLogger::WriteLog(_AE_LOG_ERROR, $errstr);
AliceUtilLogger::WriteLog(_AE_LOG_ERROR, "Execution aborted due to PHP fatal error");
break;
case E_WARNING:
case E_USER_WARNING:
// Log as debug messages so that we don't spook the user with warnings
AliceUtilLogger::WriteLog(_AE_LOG_WARNING, "PHP WARNING on line $errline in file $errfile:");
AliceUtilLogger::WriteLog(_AE_LOG_WARNING, $errstr);
break;
case E_NOTICE:
case E_USER_NOTICE:
// Log as debug messages so that we don't spook the user with notices
AliceUtilLogger::WriteLog(_AE_LOG_DEBUG, "PHP NOTICE on line $errline in file $errfile:");
AliceUtilLogger::WriteLog(_AE_LOG_DEBUG, $errstr);
break;
default:
// These are E_DEPRECATED, E_STRICT etc. Ignore that crap.
break;
}
// Don't execute PHP's internal error handler
//return true;
}