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Merge pull request #19098 from owncloud/db-lock-no-transaction 

Remove the need for the transaction in the database locking backend
This commit is contained in:
Thomas Müller 2015-09-18 17:02:18 +02:00
parent 3325fb4cdd e9b1aa6037
commit bbf128f1b2
3 changed files with 90 additions and 17 deletions
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49
lib/private/lock/dblockingprovider.php
View File

@ -21,6 +21,7 @@
namespace OC\Lock;
use OCP\AppFramework\Utility\ITimeFactory;
use OCP\IDBConnection;
use OCP\ILogger;
use OCP\Lock\LockedException;
@ -39,17 +40,34 @@ class DBLockingProvider extends AbstractLockingProvider {
*/
private $logger;
/**
* @var \OCP\AppFramework\Utility\ITimeFactory
*/
private $timeFactory;
const TTL = 3600; // how long until we clear stray locks in seconds
/**
* @param \OCP\IDBConnection $connection
* @param \OCP\ILogger $logger
* @param \OCP\AppFramework\Utility\ITimeFactory $timeFactory
*/
public function __construct(IDBConnection $connection, ILogger $logger) {
public function __construct(IDBConnection $connection, ILogger $logger, ITimeFactory $timeFactory) {
$this->connection = $connection;
$this->logger = $logger;
$this->timeFactory = $timeFactory;
}
protected function initLockField($path) {
$this->connection->insertIfNotExist('*PREFIX*file_locks', ['key' => $path, 'lock' => 0, 'ttl' => 0], ['key']);
$expire = $this->getExpireTime();
$this->connection->insertIfNotExist('*PREFIX*file_locks', ['key' => $path, 'lock' => 0, 'ttl' => $expire], ['key']);
}
/**
* @return int
*/
protected function getExpireTime() {
return $this->timeFactory->getTime() + self::TTL;
}
/**
@ -76,24 +94,23 @@ class DBLockingProvider extends AbstractLockingProvider {
* @throws \OCP\Lock\LockedException
*/
public function acquireLock($path, $type) {
if ($this->connection->inTransaction()){
if ($this->connection->inTransaction()) {
$this->logger->warning("Trying to acquire a lock for '$path' while inside a transition");
}
$this->connection->beginTransaction();
$this->initLockField($path);
$expire = $this->getExpireTime();
if ($type === self::LOCK_SHARED) {
$result = $this->connection->executeUpdate(
'UPDATE `*PREFIX*file_locks` SET `lock` = `lock` + 1 WHERE `key` = ? AND `lock` >= 0',
[$path]
'UPDATE `*PREFIX*file_locks` SET `lock` = `lock` + 1, `ttl` = ? WHERE `key` = ? AND `lock` >= 0',
[$expire, $path]
);
} else {
$result = $this->connection->executeUpdate(
'UPDATE `*PREFIX*file_locks` SET `lock` = -1 WHERE `key` = ? AND `lock` = 0',
[$path]
'UPDATE `*PREFIX*file_locks` SET `lock` = -1, `ttl` = ? WHERE `key` = ? AND `lock` = 0',
[$expire, $path]
);
}
$this->connection->commit();
if ($result !== 1) {
throw new LockedException($path);
}
@ -129,16 +146,16 @@ class DBLockingProvider extends AbstractLockingProvider {
* @throws \OCP\Lock\LockedException
*/
public function changeLock($path, $targetType) {
$this->initLockField($path);
$expire = $this->getExpireTime();
if ($targetType === self::LOCK_SHARED) {
$result = $this->connection->executeUpdate(
'UPDATE `*PREFIX*file_locks` SET `lock` = 1 WHERE `key` = ? AND `lock` = -1',
[$path]
'UPDATE `*PREFIX*file_locks` SET `lock` = 1, `ttl` = ? WHERE `key` = ? AND `lock` = -1',
[$expire, $path]
);
} else {
$result = $this->connection->executeUpdate(
'UPDATE `*PREFIX*file_locks` SET `lock` = -1 WHERE `key` = ? AND `lock` = 1',
[$path]
'UPDATE `*PREFIX*file_locks` SET `lock` = -1, `ttl` = ? WHERE `key` = ? AND `lock` = 1',
[$expire, $path]
);
}
if ($result !== 1) {
@ -151,8 +168,10 @@ class DBLockingProvider extends AbstractLockingProvider {
* cleanup empty locks
*/
public function cleanEmptyLocks() {
$expire = $this->timeFactory->getTime();
$this->connection->executeUpdate(
'DELETE FROM `*PREFIX*file_locks` WHERE `lock` = 0'
'DELETE FROM `*PREFIX*file_locks` WHERE `lock` = 0 AND `ttl` < ?',
[$expire]
);
}

2
lib/private/server.php
View File

@ -460,7 +460,7 @@ class Server extends SimpleContainer implements IServerContainer {
if (!($memcache instanceof \OC\Memcache\NullCache)) {
return new MemcacheLockingProvider($memcache);
}
return new DBLockingProvider($c->getDatabaseConnection(), $c->getLogger());
return new DBLockingProvider($c->getDatabaseConnection(), $c->getLogger(), new TimeFactory());
}
return new NoopLockingProvider();
});

56
tests/lib/lock/dblockingprovider.php
View File

@ -21,23 +21,77 @@
namespace Test\Lock;
use OCP\Lock\ILockingProvider;
class DBLockingProvider extends LockingProvider {
/**
* @var \OC\Lock\DBLockingProvider
*/
protected $instance;
/**
* @var \OCP\IDBConnection
*/
private $connection;
/**
* @var \OCP\AppFramework\Utility\ITimeFactory
*/
private $timeFactory;
private $currentTime;
public function setUp() {
$this->currentTime = time();
$this->timeFactory = $this->getMock('\OCP\AppFramework\Utility\ITimeFactory');
$this->timeFactory->expects($this->any())
->method('getTime')
->will($this->returnCallback(function () {
return $this->currentTime;
}));
parent::setUp();
}
/**
* @return \OCP\Lock\ILockingProvider
*/
protected function getInstance() {
$this->connection = \OC::$server->getDatabaseConnection();
return new \OC\Lock\DBLockingProvider($this->connection, \OC::$server->getLogger());
return new \OC\Lock\DBLockingProvider($this->connection, \OC::$server->getLogger(), $this->timeFactory);
}
public function tearDown() {
$this->connection->executeQuery('DELETE FROM `*PREFIX*file_locks`');
parent::tearDown();
}
public function testCleanEmptyLocks() {
$this->currentTime = 100;
$this->instance->acquireLock('foo', ILockingProvider::LOCK_EXCLUSIVE);
$this->instance->acquireLock('asd', ILockingProvider::LOCK_EXCLUSIVE);
$this->currentTime = 200;
$this->instance->acquireLock('bar', ILockingProvider::LOCK_EXCLUSIVE);
$this->instance->changeLock('asd', ILockingProvider::LOCK_SHARED);
$this->currentTime = 150 + \OC\Lock\DBLockingProvider::TTL;
$this->assertEquals(3, $this->getLockEntryCount());
$this->instance->cleanEmptyLocks();
$this->assertEquals(3, $this->getLockEntryCount());
$this->instance->releaseAll();
$this->instance->cleanEmptyLocks();
$this->assertEquals(2, $this->getLockEntryCount());
}
private function getLockEntryCount() {
$query = $this->connection->prepare('SELECT count(*) FROM `*PREFIX*file_locks`');
$query->execute();
return $query->fetchColumn();
}
}