mirror of https://github.com/friendica/friendica
118 lines
2.5 KiB
PHP
118 lines
2.5 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\Database;
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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 DatabaseLock extends AbstractLock
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{
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/**
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* The current ID of the process
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*
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* @var int
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*/
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private $pid;
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/**
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* @var Database The database connection of Friendica
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*/
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private $dba;
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/**
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* @param null|int $pid The Id of the current process (null means determine automatically)
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*/
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public function __construct(Database $dba, $pid = null)
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{
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$this->dba = $dba;
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$this->pid = isset($pid) ? $pid : getmypid();
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}
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/**
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* (@inheritdoc)
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*/
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public function acquireLock($key, $timeout = 120, $ttl = Cache::FIVE_MINUTES)
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{
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$got_lock = false;
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$start = time();
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do {
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$this->dba->lock('locks');
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$lock = $this->dba->selectFirst('locks', ['locked', 'pid'], ['`name` = ? AND `expires` >= ?', $key, DateTimeFormat::utcNow()]);
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if ($this->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'] == $this->pid) {
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$got_lock = true;
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}
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}
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if (!$lock['locked']) {
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$this->dba->update('locks', ['locked' => true, 'pid' => $this->pid, '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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$this->dba->insert('locks', ['name' => $key, 'locked' => true, 'pid' => $this->pid, '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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$this->dba->unlock();
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if (!$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, $override = false)
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{
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if ($override) {
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$where = ['name' => $key];
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} else {
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$where = ['name' => $key, 'pid' => $this->pid];
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}
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$return = $this->dba->delete('locks', $where);
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$this->markRelease($key);
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return $return;
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}
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/**
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* (@inheritdoc)
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*/
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public function releaseAll()
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{
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$return = $this->dba->delete('locks', ['pid' => $this->pid]);
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$this->acquiredLocks = [];
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return $return;
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}
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/**
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* (@inheritdoc)
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*/
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public function isLocked($key)
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{
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$lock = $this->dba->selectFirst('locks', ['locked'], ['`name` = ? AND `expires` >= ?', $key, DateTimeFormat::utcNow()]);
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if ($this->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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