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Adding multihost - locking

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Adding Unit-Tests for it
This commit is contained in:
Philipp Holzer 2018-07-04 23:37:22 +02:00
parent b07dfbb03f
commit aac94d1d74
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GPG key ID: 58160D7D6AF942B6
22 changed files with 741 additions and 154 deletions
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53
src/Core/Lock/DatabaseLockDriver.php
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@ -4,6 +4,7 @@ namespace Friendica\Core\Lock;
use dba;
use Friendica\Database\DBM;
use Friendica\Util\DateTimeFormat;
/**
* Locking driver that stores the locks in the database
@ -11,12 +12,7 @@ use Friendica\Database\DBM;
class DatabaseLockDriver extends AbstractLockDriver
{
/**
* @brief Sets a lock for a given name
*
* @param string $key The Name of the lock
* @param integer $timeout Seconds until we give up
*
* @return boolean Was the lock successful?
* (@inheritdoc)
*/
public function acquireLock($key, $timeout = 120)
{
@ -25,26 +21,25 @@ class DatabaseLockDriver extends AbstractLockDriver
do {
dba::lock('locks');
$lock = dba::selectFirst('locks', ['locked', 'pid'], ['name' => $key]);
$lock = dba::selectFirst('locks', ['locked', 'pid'], ['`name` = ? AND `expires` >= ?', $key, DateTimeFormat::utcNow()]);
if (DBM::is_result($lock)) {
if ($lock['locked']) {
// When the process id isn't used anymore, we can safely claim the lock for us.
if (!posix_kill($lock['pid'], 0)) {
$lock['locked'] = false;
}
// We want to lock something that was already locked by us? So we got the lock.
if ($lock['pid'] == getmypid()) {
$got_lock = true;
$this->markAcquire($key);
}
}
if (!$lock['locked']) {
dba::update('locks', ['locked' => true, 'pid' => getmypid()], ['name' => $key]);
dba::update('locks', ['locked' => true, 'pid' => getmypid(), 'expires' => DateTimeFormat::utc('now + 300seconds')], ['name' => $key]);
$got_lock = true;
$this->markAcquire($key);
}
} else {
dba::insert('locks', ['name' => $key, 'locked' => true, 'pid' => getmypid()]);
dba::insert('locks', ['name' => $key, 'locked' => true, 'pid' => getmypid(), 'expires' => DateTimeFormat::utc('now + 300seconds')]);
$got_lock = true;
$this->markAcquire($key);
}
dba::unlock();
@ -54,36 +49,42 @@ class DatabaseLockDriver extends AbstractLockDriver
}
} while (!$got_lock && ((time() - $start) < $timeout));
$this->markAcquire($key);
return $got_lock;
}
/**
* @brief Removes a lock if it was set by us
*
* @param string $key Name of the lock
*
* @return mixed
* (@inheritdoc)
*/
public function releaseLock($key)
{
dba::delete('locks', ['locked' => false, 'pid' => 0], ['name' => $key, 'pid' => getmypid()]);
dba::delete('locks', ['name' => $key, 'pid' => getmypid()]);
$this->releaseLock($key);
$this->markRelease($key);
return;
}
/**
* @brief Removes all lock that were set by us
*
* @return void
* (@inheritdoc)
*/
public function releaseAll()
{
dba::delete('locks', ['locked' => false, 'pid' => 0], ['pid' => getmypid()]);
dba::delete('locks', ['pid' => getmypid()]);
$this->acquiredLocks = [];
}
/**
* (@inheritdoc)
*/
public function isLocked($key)
{
$lock = dba::selectFirst('locks', ['locked'], ['`name` = ? AND `expires` >= ?', $key, DateTimeFormat::utcNow()]);
if (DBM::is_result($lock)) {
return $lock['locked'] !== false;
} else {
return false;
}
}
}