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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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68
src/Core/Lock/CacheLockDriver.php
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@ -2,7 +2,7 @@
namespace Friendica\Core\Lock;
use Friendica\Core\Cache\ICacheDriver;
use Friendica\Core\Cache\IMemoryCacheDriver;
class CacheLockDriver extends AbstractLockDriver
{
@ -14,9 +14,9 @@ class CacheLockDriver extends AbstractLockDriver
/**
* CacheLockDriver constructor.
*
* @param ICacheDriver $cache The CacheDriver for this type of lock
* @param IMemoryCacheDriver $cache The CacheDriver for this type of lock
*/
public function __construct(ICacheDriver $cache)
public function __construct(IMemoryCacheDriver $cache)
{
$this->cache = $cache;
}
@ -35,32 +35,31 @@ class CacheLockDriver extends AbstractLockDriver
$got_lock = false;
$start = time();
$cachekey = get_app()->get_hostname() . ";lock:" . $key;
$cachekey = self::getCacheKey($key);
do {
$lock = $this->cache->get($cachekey);
if (!is_bool($lock)) {
$pid = (int)$lock;
// When the process id isn't used anymore, we can safely claim the lock for us.
// Or we do want to lock something that was already locked by us.
if (!posix_kill($pid, 0) || ($pid == getmypid())) {
$lock = false;
}
}
if (is_bool($lock)) {
$this->cache->set($cachekey, getmypid(), 300);
// When we do want to lock something that was already locked by us.
if ((int)$lock == getmypid()) {
$got_lock = true;
}
// When we do want to lock something new
if (is_null($lock)) {
// At first initialize it with "0"
$this->cache->add($cachekey, 0);
// Now the value has to be "0" because otherwise the key was used by another process meanwhile
if ($this->cache->compareSet($cachekey, 0, getmypid(), 300)) {
$got_lock = true;
$this->markAcquire($key);
}
}
if (!$got_lock && ($timeout > 0)) {
usleep(rand(10000, 200000));
}
} while (!$got_lock && ((time() - $start) < $timeout));
$this->markAcquire($key);
return $got_lock;
}
@ -68,22 +67,33 @@ class CacheLockDriver extends AbstractLockDriver
* @brief Removes a lock if it was set by us
*
* @param string $key Name of the lock
*
* @return mixed
*/
public function releaseLock($key)
{
$cachekey = get_app()->get_hostname() . ";lock:" . $key;
$lock = $this->cache->get($cachekey);
if (!is_bool($lock)) {
if ((int)$lock == getmypid()) {
$this->cache->delete($cachekey);
}
}
$cachekey = self::getCacheKey($key);
$this->cache->compareDelete($cachekey, getmypid());
$this->markRelease($key);
}
return;
/**
* @brief Checks, if a key is currently locked to a process
*
* @param string $key The name of the lock
* @return bool
*/
public function isLocked($key)
{
$cachekey = self::getCacheKey($key);
$lock = $this->cache->get($cachekey);
return isset($lock) && ($lock !== false);
}
/**
* @param string $key The original key
* @return string The cache key used for the cache
*/
private static function getCacheKey($key) {
return self::getApp()->get_hostname() . ";lock:" . $key;
}
}