mirror of https://github.com/friendica/friendica
89 lines
1.9 KiB
PHP
89 lines
1.9 KiB
PHP
<?php
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namespace Friendica\Core\Lock;
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use Friendica\Core\Cache;
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use Friendica\Database\DBA;
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use Friendica\Util\DateTimeFormat;
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/**
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* Locking driver that stores the locks in the database
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*/
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class DatabaseLockDriver extends AbstractLockDriver
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{
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/**
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* (@inheritdoc)
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*/
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public function acquireLock($key, $timeout = 120, $ttl = Cache::FIVE_MINUTES)
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{
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$got_lock = false;
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$start = time();
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do {
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DBA::lock('locks');
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$lock = DBA::selectFirst('locks', ['locked', 'pid'], ['`name` = ? AND `expires` >= ?', $key, DateTimeFormat::utcNow()]);
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if (DBA::isResult($lock)) {
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if ($lock['locked']) {
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// We want to lock something that was already locked by us? So we got the lock.
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if ($lock['pid'] == getmypid()) {
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$got_lock = true;
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}
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}
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if (!$lock['locked']) {
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DBA::update('locks', ['locked' => true, 'pid' => getmypid(), 'expires' => DateTimeFormat::utc('now + ' . $ttl . 'seconds')], ['name' => $key]);
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$got_lock = true;
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}
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} else {
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DBA::insert('locks', ['name' => $key, 'locked' => true, 'pid' => getmypid(), 'expires' => DateTimeFormat::utc('now + ' . $ttl . 'seconds')]);
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$got_lock = true;
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$this->markAcquire($key);
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}
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DBA::unlock();
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if (!$got_lock && ($timeout > 0)) {
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usleep(rand(100000, 2000000));
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}
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} while (!$got_lock && ((time() - $start) < $timeout));
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return $got_lock;
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}
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/**
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* (@inheritdoc)
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*/
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public function releaseLock($key)
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{
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DBA::delete('locks', ['name' => $key, 'pid' => getmypid()]);
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$this->markRelease($key);
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return;
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}
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/**
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* (@inheritdoc)
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*/
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public function releaseAll()
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{
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DBA::delete('locks', ['pid' => getmypid()]);
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$this->acquiredLocks = [];
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}
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/**
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* (@inheritdoc)
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*/
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public function isLocked($key)
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{
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$lock = DBA::selectFirst('locks', ['locked'], ['`name` = ? AND `expires` >= ?', $key, DateTimeFormat::utcNow()]);
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if (DBA::isResult($lock)) {
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return $lock['locked'] !== false;
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} else {
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return false;
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}
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}
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}
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