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<?php
/**
* @package AkeebaBackup
* @copyright Copyright (c)2009-2016 Nicholas K. Dionysopoulos
* @license GNU General Public License version 3, or later
* @since 1.3
*/
// Protect from unauthorized access
defined('_JEXEC') or die();
use Akeeba\Engine\Factory;
use Akeeba\Engine\Platform;
/**
* The Configuration Wizard model class
*/
class AkeebaModelConfwiz extends F0FModel
{
/**
* Attempts to automatically figure out where on Earth the output and
* temporary directories should point, adjusting their permissions should
* it be necessary.
*
* @param int $dontRecurse Used internally. Always skip this parameter when calling this method.
*
* @return bool True if we could fix the directories
*/
public function autofixDirectories($dontRecurse = 0)
{
// Get the profile ID
$profile_id = Platform::getInstance()->get_active_profile();
// Get the output and temporary directory
$aeconfig = Factory::getConfiguration();
$outdir = $aeconfig->get('akeeba.basic.output_directory', '');
$fixTemp = false;
$fixOut = false;
if (is_dir($outdir))
{
// Test the writability of the directory
$filename = $outdir . '/test.dat';
$fixOut = !@file_put_contents($filename, 'test');
if (!$fixOut)
{
// Directory writable, remove the temp file
@unlink($filename);
}
else
{
// Try to chmod the directory
$this->chmod($outdir, 511);
// Repeat the test
$fixOut = !@file_put_contents($filename, 'test');
if (!$fixOut)
{
// Directory writable, remove the temp file
@unlink($filename);
}
}
}
else
{
$fixOut = true;
}
// Do I have to fix the output directory?
if ($fixOut && ($dontRecurse < 1))
{
$aeconfig->set('akeeba.basic.output_directory', '[DEFAULT_OUTPUT]');
Platform::getInstance()->save_configuration($profile_id);
// After fixing the directory, run ourselves again
return $this->autofixDirectories(1);
}
elseif ($fixOut)
{
// If we reached this point after recursing, we can't fix the permissions
// and the user has to RTFM and fix the issue!
return false;
}
return true;
}
/**
* Creates a temporary file of a specific size
*
* @param int $blocks How many 128Kb blocks to write. Common values: 1, 2, 4, 16, 40, 80, 81
* @param string|null $tempdir
*
* @return bool
*/
public function createTempFile($blocks = 1, $tempdir = null)
{
if (empty($tempdir))
{
$aeconfig = Factory::getConfiguration();
$tempdir = $aeconfig->get('akeeba.basic.output_directory', '');
}
$sixtyfourBytes = '012345678901234567890123456789012345678901234567890123456789ABCD';
$oneKilo = '';
$oneBlock = '';
for ($i = 0; $i < 16; $i ++)
{
$oneKilo .= $sixtyfourBytes;
}
for ($i = 0; $i < 128; $i ++)
{
$oneBlock .= $oneKilo;
}
$filename = tempnam($tempdir, 'confwiz') . '.jpa';
@unlink($filename);
$fp = @fopen($filename, 'w');
if ($fp !== false)
{
for ($i = 0; $i < $blocks; $i ++)
{
if (!@fwrite($fp, $oneBlock))
{
@fclose($fp);
@unlink($filename);
return false;
}
}
@fclose($fp);
@unlink($filename);
}
else
{
return false;
}
return true;
}
/**
* Sleeps for a given amount of time. Returns false if the sleep time requested is over
* the maximum execution time.
*
* @param $secondsDelay int Seconds to sleep
*
* @return bool
*/
public function doNothing($secondsDelay = 1)
{
// Try to get the maximum execution time and PHP memory limit
if (function_exists('ini_get'))
{
$maxexec = ini_get("max_execution_time");
$memlimit = ini_get("memory_limit");
}
else
{
$maxexec = 14;
$memlimit = 16777216;
}
// Unknown time limit; suppose 10s
if (!is_numeric($maxexec) || ($maxexec == 0))
{
$maxexec = 10;
}
// Some servers report silly values, i.e. 30000, which Do Not Work™ :(
if ($maxexec > 180)
{
$maxexec = 10;
}
// Sometimes memlimit comes with the M or K suffixes. Parse them.
if (is_string($memlimit))
{
$memlimit = strtoupper(trim(str_replace(' ', '', $memlimit)));
if (substr($memlimit, - 1) == 'K')
{
$memlimit = 1024 * substr($memlimit, 0, - 1);
}
elseif (substr($memlimit, - 1) == 'M')
{
$memlimit = 1024 * 1024 * substr($memlimit, 0, - 1);
}
elseif (substr($memlimit, - 1) == 'G')
{
$memlimit = 1024 * 1024 * 1024 * substr($memlimit, 0, - 1);
}
}
// Unknown limit; suppose 16M
if (!is_numeric($memlimit) || ($memlimit === 0))
{
$memlimit = 16777216;
}
// No limit; suppose 128M
if ($memlimit === - 1)
{
$memlimit = 134217728;
}
// Get the current memory usage (or assume one if the metric is not available)
if (function_exists('memory_get_usage'))
{
$usedram = memory_get_usage();
}
else
{
$usedram = 7340032; // Suppose 7M of RAM usage if the metric isn't available;
}
// If we have less than 12M of RAM left, we have to limit ourselves to 6 seconds of
// total execution time (emperical value!) to avoid deadly memory outages
if (($memlimit - $usedram) < 12582912)
{
$maxexec = 5;
}
// If the requested delay is over the $maxexec limit (minus one second
// for application initialization), return false
if ($secondsDelay > ($maxexec - 1))
{
return false;
}
// And now, run the silly loop to simulate the CPU usage pattern during backup
$start = microtime(true);
$loop = true;
while ($loop)
{
// Waste some CPU power...
for ($i = 1; $i < 1000; $i ++)
{
$j = exp(($i * $i / 123 * 864) >> 2);
}
// ... then sleep for a millisec
usleep(1000);
// Are we done yet?
$end = microtime(true);
if (($end - $start) >= $secondsDelay)
{
$loop = false;
}
}
return true;
}
/**
* This method will analyze your database tables and try to figure out the optimal
* batch row count value so that its select doesn't return excessive amounts of data.
* The only drawback is that it only accounts for the core tables, but that is usually
* a good metric.
*/
public function analyzeDatabase()
{
// Try to get the PHP memory limit
if (function_exists('ini_get'))
{
$memlimit = ini_get("memory_limit");
}
else
{
$memlimit = 16777216;
}
if (!is_numeric($memlimit) || ($memlimit === 0))
{
$memlimit = 16777216; // Unknown limit; suppose 16M
}
if ($memlimit === - 1)
{
$memlimit = 134217728; // No limit; suppose 128M
}
// Get the current memory usage (or assume one if the metric is not available)
if (function_exists('memory_get_usage'))
{
$usedram = memory_get_usage();
}
else
{
$usedram = 7340032; // Suppose 7M of RAM usage if the metric isn't available;
}
// How much RAM can I spare? It's the max memory minus the current memory usage and an extra
// 5Mb to cater for Akeeba Engine's peak memory usage
$max_mem_usage = $usedram + 5242880;
$ram_allowance = $memlimit - $max_mem_usage;
// If the RAM allowance is too low, assume 2Mb (emperical value)
if ($ram_allowance < 2097152)
{
$ram_allowance = 2097152;
}
$rowCount = 100;
// Get the table statistics
$db = $this->getDBO();
if (strtolower(substr($db->name, 0, 5)) == 'mysql')
{
// The table analyzer only works with MySQL
$db->setQuery("SHOW TABLE STATUS");
try
{
$metrics = $db->loadAssocList();
if ($db->getError())
{
$metrics = null;
}
}
catch (Exception $exc)
{
$metrics = null;
}
if (is_null($metrics))
{
// SHOW TABLE STATUS is not supported. I'll assume a safe-ish value of 100 rows
$rowCount = 100;
}
else
{
$rowCount = 1000; // Start with the default value
if (!empty($metrics))
{
foreach ($metrics as $table)
{
// Get row count and average row length
$rows = $table['Rows'];
$avg_len = $table['Avg_row_length'];
// Calculate RAM usage with current settings
$max_rows = min($rows, $rowCount);
$max_ram_current = $max_rows * $avg_len;
if ($max_ram_current > $ram_allowance)
{
// Hm... over the allowance. Let's try to find a sweet spot.
$max_rows = (int) ($ram_allowance / $avg_len);
// Quantize to multiple of 10 rows
$max_rows = 10 * floor($max_rows / 10);
// Can't really go below 10 rows / batch
if ($max_rows < 10)
{
$max_rows = 10;
}
// If the new setting is less than the current $rowCount, use the new setting
if ($rowCount > $max_rows)
{
$rowCount = $max_rows;
}
}
}
}
}
}
$profile_id = Platform::getInstance()->get_active_profile();
$config = Factory::getConfiguration();
// Use the correct database dump engine
if (strtolower(substr($db->name, 0, 5)) == 'mysql')
{
$config->set('akeeba.advanced.dump_engine', 'native');
}
else
{
$config->set('akeeba.advanced.dump_engine', 'reverse');
}
// Save the row count per batch
$config->set('engine.dump.common.batchsize', $rowCount);
// Enable SQL file splitting - default is 512K unless the part_size is less than that!
$splitsize = 524288;
$partsize = $config->get('engine.archiver.common.part_size', 0);
if (($partsize < $splitsize) && !empty($partsize))
{
$splitsize = $partsize;
}
$config->set('engine.dump.common.splitsize', $splitsize);
// Enable extended INSERTs
$config->set('engine.dump.common.extended_inserts', '1');
// Determine optimal packet size (must be at most two fifths of the split size and no more than 256K)
$packet_size = (int) $splitsize * 0.4;
if ($packet_size > 262144)
{
$packet_size = 262144;
}
$config->set('engine.dump.common.packet_size', $packet_size);
// Enable the native dump engine
$config->set('akeeba.advanced.dump_engine', 'native');
Platform::getInstance()->save_configuration($profile_id);
}
/**
* Changes the permissions of a file or directory using direct file access or
* Joomla!'s FTP layer, whichever works
*
* @param string $path Absolute path to the file/dir to chmod
* @param string $mode The permissions mode to apply
*
* @return bool True on success
*/
private function chmod($path, $mode)
{
if (is_string($mode))
{
$mode = octdec($mode);
}
// Initialize variables
JLoader::import('joomla.client.helper');
$ftpOptions = JClientHelper::getCredentials('ftp');
// Check to make sure the path valid and clean
$path = JPath::clean($path);
if ($ftpOptions['enabled'] == 1)
{
// Connect the FTP client
JLoader::import('joomla.client.ftp');
$ftp = JClientFTP::getInstance(
$ftpOptions['host'], $ftpOptions['port'], array(), $ftpOptions['user'], $ftpOptions['pass']
);
}
if (@chmod($path, $mode))
{
$ret = true;
}
elseif ($ftpOptions['enabled'] == 1)
{
// Translate path and delete
JLoader::import('joomla.client.ftp');
$path = JPath::clean(str_replace(JPATH_ROOT, $ftpOptions['root'], $path), '/');
// FTP connector throws an error
$ret = $ftp->chmod($path, $mode);
}
else
{
return false;
}
return $ret;
}
public function runAjax()
{
$act = $this->getState('act');
if (method_exists($this, $act))
{
$result = $this->$act();
}
else
{
$result = false;
}
return $result;
}
private function ping()
{
// Get the profile ID
$profile_id = Platform::getInstance()->get_active_profile();
// Set the embedded installer to the default ANGIE installer
$aeconfig = Factory::getConfiguration();
$aeconfig->set('akeeba.advanced.embedded_installer', 'angie');
// And mark this profile as already configured
$aeconfig->set('akeeba.flag.confwiz', 1);
Platform::getInstance()->save_configuration($profile_id);
return true;
}
/**
* Try different values of minimum execution time
*/
private function minexec()
{
$seconds = $this->input->get('seconds', '0.5', 'float');
if ($seconds < 1)
{
usleep($seconds * 1000000);
}
else
{
sleep($seconds);
}
return true;
}
/**
* Saves the AJAX preference and the minimum execution time
*
* @return bool
*/
private function applyminexec()
{
// Get the user parameters
$iframes = $this->input->get('iframes', 0, 'int');
$minexec = $this->input->get('minexec', 2.0, 'float');
// Save the settings
$profile_id = Platform::getInstance()->get_active_profile();
$config = Factory::getConfiguration();
$config->set('akeeba.basic.useiframe', $iframes);
$config->set('akeeba.tuning.min_exec_time', $minexec * 1000);
Platform::getInstance()->save_configuration($profile_id);
// Enforce the min exec time
$timer = Factory::getTimer();
$timer->enforce_min_exec_time(false);
// Done!
return true;
}
/**
* Try to make the directories writable or provide a set of writable directories
*
* @return bool
*/
private function directories()
{
$timer = Factory::getTimer();
$result = $this->autofixDirectories();
$timer->enforce_min_exec_time(false);
return $result;
}
/**
* Analyze the database and apply optimized database dump settings
*
* @return bool
*/
private function database()
{
$timer = Factory::getTimer();
$this->analyzeDatabase();
$timer->enforce_min_exec_time(false);
return true;
}
/**
* Try to apply a specific maximum execution time setting
*
* @return bool
*/
private function maxexec()
{
$seconds = $this->input->get('seconds', 30, 'int');
$timer = Factory::getTimer();
$result = $this->doNothing($seconds);
$timer->enforce_min_exec_time(false);
return $result;
}
/**
* Save a specific maximum execution time preference to the database
*
* @return bool
*/
private function applymaxexec()
{
// Get the user parameters
$maxexec = $this->input->get('seconds', 2, 'int');
// Save the settings
$timer = Factory::getTimer();
$profile_id = Platform::getInstance()->get_active_profile();
$config = Factory::getConfiguration();
$config->set('akeeba.tuning.max_exec_time', $maxexec);
$config->set('akeeba.tuning.run_time_bias', '75');
$config->set('akeeba.advanced.scan_engine', 'smart');
$config->set('akeeba.advanced.archiver_engine', 'jpa');
Platform::getInstance()->save_configuration($profile_id);
// Enforce the min exec time
$timer->enforce_min_exec_time(false);
// Done!
return true;
}
/**
* Creates a dummy file of a given size. Remember to give the filesize
* query parameter in bytes!
*/
public function partsize()
{
$timer = Factory::getTimer();
$blocks = $this->input->get('blocks', 1, 'int');
$result = $this->createTempFile($blocks);
if ($result)
{
// Save the setting
if ($blocks > 200)
{
$blocks = 16383; // Over 25Mb = 2Gb minus 128Kb limit (safe setting for PHP not running on 64-bit Linux)
}
$profile_id = Platform::getInstance()->get_active_profile();
$config = Factory::getConfiguration();
$config->set('engine.archiver.common.part_size', $blocks * 128 * 1024);
Platform::getInstance()->save_configuration($profile_id);
}
// Enforce the min exec time
$timer->enforce_min_exec_time(false);
return $result;
}
}