friendica/src/Core/Update.php

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<?php
namespace Friendica\Core;
use Friendica\Database\DBStructure;
class Update
{
const SUCCESS = 0;
const FAILED = 1;
/**
* Automatic database updates
*/
public static function run()
{
$build = Config::get('system', 'build');
if (empty($build) || ($build > DB_UPDATE_VERSION)) {
$build = DB_UPDATE_VERSION - 1;
Config::set('system', 'build', $build);
}
if ($build != DB_UPDATE_VERSION) {
require_once 'update.php';
$stored = intval($build);
$current = intval(DB_UPDATE_VERSION);
if ($stored < $current) {
Config::load('database');
// Compare the current structure with the defined structure
if (Lock::acquire('dbupdate')) {
// run the pre_update_nnnn functions in update.php
for ($x = $stored + 1; $x <= $current; $x++) {
$r = self::runUpdateFunction($x, 'pre_update');
if (!$r) {
break;
}
}
// update the structure in one call
$retval = DBStructure::update(false, true);
if ($retval) {
DBStructure::updateFail(
DB_UPDATE_VERSION,
$retval
);
Lock::release('dbupdate');
return;
} else {
Config::set('database', 'last_successful_update', $current);
Config::set('database', 'last_successful_update_time', time());
}
// run the update_nnnn functions in update.php
for ($x = $stored + 1; $x <= $current; $x++) {
$r = self::runUpdateFunction($x, 'update');
if (!$r) {
break;
}
}
Lock::release('dbupdate');
}
}
}
}
/**
* Executes a specific update function
*
* @param int $x the DB version number of the function
* @param string $prefix the prefix of the function (update, pre_update)
*
* @return bool true, if the update function worked
*/
public static function runUpdateFunction($x, $prefix)
{
$funcname = $prefix . '_' . $x;
if (function_exists($funcname)) {
// There could be a lot of processes running or about to run.
// We want exactly one process to run the update command.
// So store the fact that we're taking responsibility
// after first checking to see if somebody else already has.
// If the update fails or times-out completely you may need to
// delete the config entry to try again.
if (Lock::acquire('dbupdate_function')) {
// call the specific update
$retval = $funcname();
if ($retval) {
//send the administrator an e-mail
DBStructure::updateFail(
$x,
L10n::t('Update %s failed. See error logs.', $x)
);
Lock::release('dbupdate_function');
return false;
} else {
Config::set('database', 'last_successful_update_function', $funcname);
Config::set('database', 'last_successful_update_function_time', time());
if ($prefix == 'update') {
Config::set('system', 'build', $x);
}
Lock::release('dbupdate_function');
return true;
}
}
} else {
logger('Skipping \'' . $funcname . '\' without executing', LOGGER_DEBUG);
Config::set('database', 'last_successful_update_function', $funcname);
Config::set('database', 'last_successful_update_function_time', time());
if ($prefix == 'update') {
Config::set('system', 'build', $x);
}
return true;
}
}
}