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redesign of locking & caching 

- New Factory "CacheDriverFactory" for Cache and Locks
- Adding Redis/Memcached Locking
- Moved Lock to Core
- other improvements
This commit is contained in:
Philipp Holzer 2018-06-28 22:57:17 +02:00
parent acf6a5cb9e
commit 3f7e4f5bb6
No known key found for this signature in database
GPG Key ID: 58160D7D6AF942B6
12 changed files with 369 additions and 240 deletions
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27
src/Core/Cache.php
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@ -4,8 +4,7 @@
*/
namespace Friendica\Core;
use Friendica\Core\Cache;
use Friendica\Core\Config;
use Friendica\Core\Cache\CacheDriverFactory;
/**
* @brief Class for storing data for a short time
@ -24,31 +23,13 @@ class Cache extends \Friendica\BaseObject
/**
* @var Cache\ICacheDriver
*/
static $driver = null;
private static $driver = null;
public static function init()
{
switch(Config::get('system', 'cache_driver', 'database')) {
case 'memcache':
$memcache_host = Config::get('system', 'memcache_host', '127.0.0.1');
$memcache_port = Config::get('system', 'memcache_port', 11211);
$driver_name = Config::get('system', 'cache_driver', 'database');
self::$driver = new Cache\MemcacheCacheDriver($memcache_host, $memcache_port);
break;
case 'memcached':
$memcached_hosts = Config::get('system', 'memcached_hosts', [['127.0.0.1', 11211]]);
self::$driver = new Cache\MemcachedCacheDriver($memcached_hosts);
break;
case 'redis':
$redis_host = Config::get('system', 'redis_host', '127.0.0.1');
$redis_port = Config::get('system', 'redis_port', 6379);
self::$driver = new Cache\RedisCacheDriver($redis_host, $redis_port);
break;
default:
self::$driver = new Cache\DatabaseCacheDriver();
}
self::$driver = CacheDriverFactory::create($driver_name);
}
/**

48
src/Core/Cache/CacheDriverFactory.php Normal file
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@ -0,0 +1,48 @@
<?php
namespace Friendica\Core\Cache;
use Friendica\Core\Config;
/**
* Class CacheDriverFactory
*
* @package Friendica\Core\Cache
*
* @brief A basic class to generate a CacheDriver
*/
class CacheDriverFactory
{
/**
* @brief This method creates a CacheDriver for the given cache driver name
*
* @param string $driver The name of the cache driver
* @return ICacheDriver The instance of the CacheDriver
* @throws \Exception The exception if something went wrong during the CacheDriver creation
*/
public static function create(string $driver) : ICacheDriver {
switch ($driver) {
case 'memcache':
$memcache_host = Config::get('system', 'memcache_host', '127.0.0.1');
$memcache_port = Config::get('system', 'memcache_port', 11211);
return new MemcacheCacheDriver($memcache_host, $memcache_port);
break;
case 'memcached':
$memcached_hosts = Config::get('system', 'memcached_hosts', [['127.0.0.1', 11211]]);
return new MemcachedCacheDriver($memcached_hosts);
break;
case 'redis':
$redis_host = Config::get('system', 'redis_host', '127.0.0.1');
$redis_port = Config::get('system', 'redis_port', 6379);
return new RedisCacheDriver($redis_host, $redis_port);
break;
default:
return new DatabaseCacheDriver();
}
}
}

145
src/Core/Lock.php Normal file
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@ -0,0 +1,145 @@
<?php
/**
* @file src/Util/Lock.php
*/
namespace Friendica\Core;
/**
* @file src/Core/Lock.php
* @brief Functions for preventing parallel execution of functions
*/
use Friendica\Core\Cache\CacheDriverFactory;
/**
* @brief This class contain Functions for preventing parallel execution of functions
*/
class Lock
{
/**
* @var Lock\ILockDriver;
*/
static $driver = null;
public static function init()
{
$lock_driver = Config::get('system', 'lock_driver', 'default');
try {
switch ($lock_driver) {
case 'memcache':
$cache_driver = CacheDriverFactory::create('memcache');
self::$driver = new Lock\CacheLockDriver($cache_driver);
break;
case 'memcached':
$cache_driver = CacheDriverFactory::create('memcached');
self::$driver = new Lock\CacheLockDriver($cache_driver);
break;
case 'redis':
$cache_driver = CacheDriverFactory::create('redis');
self::$driver = new Lock\CacheLockDriver($cache_driver);
break;
case 'database':
self::$driver = new Lock\DatabaseLockDriver();
break;
case 'semaphore':
self::$driver = new Lock\SemaphoreLockDriver();
break;
default:
self::useAutoDriver();
}
} catch (\Exception $exception) {
logger ('Driver \'' . $lock_driver . '\' failed - Fallback to \'useAutoDriver()\'');
self::useAutoDriver();
}
}
/**
* @brief This method tries to find the best - local - locking method for Friendica
*
* The following sequence will be tried:
* 1. Semaphore Locking
* 2. Cache Locking
* 3. Database Locking
*
*/
private static function useAutoDriver() {
// 1. Try to use Semaphores for - local - locking
if (function_exists('sem_get')) {
try {
self::$driver = new Lock\SemaphoreLockDriver();
return;
} catch (\Exception $exception) {
logger ('Using Semaphore driver for locking failed: ' . $exception->getMessage());
}
}
// 2. Try to use Cache Locking (don't use the DB-Cache Locking because it works different!)
$cache_driver = Config::get('system', 'cache_driver', 'database');
if ($cache_driver != 'database') {
try {
$lock_driver = CacheDriverFactory::create($cache_driver);
self::$driver = new Lock\CacheLockDriver($lock_driver);
return;
} catch (\Exception $exception) {
logger('Using Cache driver for locking failed: ' . $exception->getMessage());
}
}
// 3. Use Database Locking as a Fallback
self::$driver = new Lock\DatabaseLockDriver();
}
/**
* Returns the current cache driver
*
* @return Lock\ILockDriver;
*/
private static function getDriver()
{
if (self::$driver === null) {
self::init();
}
return self::$driver;
}
/**
* @brief Acquires a lock for a given name
*
* @param string $key Name of the lock
* @param integer $timeout Seconds until we give up
*
* @return boolean Was the lock successful?
*/
public static function acquireLock($key, $timeout = 120)
{
return self::getDriver()->acquireLock($key, $timeout);
}
/**
* @brief Releases a lock if it was set by us
*
* @param string $key Name of the lock
* @return mixed
*/
public static function releaseLock($key)
{
return self::getDriver()->releaseLock($key);
}
/**
* @brief Releases all lock that were set by us
* @return void
*/
public static function releaseAll()
{
self::getDriver()->releaseAll();
}
}

57
src/Core/Lock/AbstractLockDriver.php Normal file
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@ -0,0 +1,57 @@
<?php
namespace Friendica\Core\Lock;
/**
* Class AbstractLockDriver
*
* @package Friendica\Core\Lock
*
* @brief Basic class for Locking with common functions (local acquired locks, releaseAll, ..)
*/
abstract class AbstractLockDriver implements ILockDriver
{
/**
* @var array The local acquired locks
*/
protected $acquiredLocks = [];
/**
* @brief Check if we've locally acquired a lock
*
* @param string key The Name of the lock
* @return bool Returns true if the lock is set
*/
protected function hasAcquiredLock(string $key): bool {
return isset($this->acquireLock[$key]);
}
/**
* @brief Mark a locally acquired lock
*
* @param string $key The Name of the lock
*/
protected function markAcquire(string $key) {
$this->acquiredLocks[$key] = true;
}
/**
* @brief Mark a release of a locally acquired lock
*
* @param string $key The Name of the lock
*/
protected function markRelease(string $key) {
unset($this->acquiredLocks[$key]);
}
/**
* @brief Releases all lock that were set by us
*
* @return void
*/
public function releaseAll() {
foreach ($this->acquiredLocks as $acquiredLock) {
$this->releaseLock($acquiredLock);
}
}
}

51
src/Util/Lock/MemcacheLockDriver.php → src/Core/Lock/CacheLockDriver.php
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@ -1,12 +1,26 @@
<?php
namespace Friendica\Util\Lock;
namespace Friendica\Core\Lock;
use Friendica\Core\Cache;
use dba;
use Friendica\Core\Cache\ICacheDriver;
class MemcacheLockDriver implements ILockDriver
class CacheLockDriver extends AbstractLockDriver
{
/**
* @var \Friendica\Core\Cache\ICacheDriver;
*/
private $cache;
/**
* CacheLockDriver constructor.
*
* @param ICacheDriver $cache The CacheDriver for this type of lock
*/
public function __construct(ICacheDriver $cache)
{
$this->cache = $cache;
}
/**
*
* @brief Sets a lock for a given name
@ -16,7 +30,7 @@ class MemcacheLockDriver implements ILockDriver
*
* @return boolean Was the lock successful?
*/
public function acquireLock($key, $timeout = 120)
public function acquireLock(string $key, int $timeout = 120)
{
$got_lock = false;
$start = time();
@ -24,9 +38,7 @@ class MemcacheLockDriver implements ILockDriver
$cachekey = get_app()->get_hostname() . ";lock:" . $key;
do {
// We only lock to be sure that nothing happens at exactly the same time
dba::lock('locks');
$lock = Cache::get($cachekey);
$lock = $this->cache->get($cachekey);
if (!is_bool($lock)) {
$pid = (int)$lock;
@ -38,17 +50,17 @@ class MemcacheLockDriver implements ILockDriver
}
}
if (is_bool($lock)) {
Cache::set($cachekey, getmypid(), 300);
$this->cache->set($cachekey, getmypid(), 300);
$got_lock = true;
}
dba::unlock();
if (!$got_lock && ($timeout > 0)) {
usleep(rand(10000, 200000));
}
} while (!$got_lock && ((time() - $start) < $timeout));
$this->markAcquire($key);
return $got_lock;
}
@ -59,28 +71,19 @@ class MemcacheLockDriver implements ILockDriver
*
* @return mixed
*/
public function releaseLock($key)
public function releaseLock(string $key)
{
$cachekey = get_app()->get_hostname() . ";lock:" . $key;
$lock = Cache::get($cachekey);
$lock = $this->cache->get($cachekey);
if (!is_bool($lock)) {
if ((int)$lock == getmypid()) {
Cache::delete($cachekey);
$this->cache->delete($cachekey);
}
}
return;
}
$this->markRelease($key);
/**
* @brief Removes all lock that were set by us
*
* @return void
*/
public function releaseAll()
{
// We cannot delete all cache entries, but this doesn't matter with memcache
return;
}
}

20
src/Util/Lock/DatabaseLockDriver.php → src/Core/Lock/DatabaseLockDriver.php
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@ -1,6 +1,6 @@
<?php
namespace Friendica\Util\Lock;
namespace Friendica\Core\Lock;
use dba;
use Friendica\Database\DBM;
@ -8,7 +8,7 @@ use Friendica\Database\DBM;
/**
* Locking driver that stores the locks in the database
*/
class DatabaseLockDriver implements ILockDriver
class DatabaseLockDriver extends AbstractLockDriver
{
/**
* @brief Sets a lock for a given name
@ -18,7 +18,7 @@ class DatabaseLockDriver implements ILockDriver
*
* @return boolean Was the lock successful?
*/
public function acquireLock($key, $timeout = 120)
public function acquireLock(string $key, int $timeout = 120)
{
$got_lock = false;
$start = time();
@ -42,7 +42,7 @@ class DatabaseLockDriver implements ILockDriver
dba::update('locks', ['locked' => true, 'pid' => getmypid()], ['name' => $key]);
$got_lock = true;
}
} elseif (!DBM::is_result($lock)) {
} else {
dba::insert('locks', ['name' => $key, 'locked' => true, 'pid' => getmypid()]);
$got_lock = true;
}
@ -54,6 +54,8 @@ class DatabaseLockDriver implements ILockDriver
}
} while (!$got_lock && ((time() - $start) < $timeout));
$this->markAcquire($key);
return $got_lock;
}
@ -64,9 +66,11 @@ class DatabaseLockDriver implements ILockDriver
*
* @return mixed
*/
public function releaseLock($key)
public function releaseLock(string $key)
{
dba::update('locks', ['locked' => false, 'pid' => 0], ['name' => $key, 'pid' => getmypid()]);
dba::delete('locks', ['locked' => false, 'pid' => 0], ['name' => $key, 'pid' => getmypid()]);
$this->releaseLock($key);
return;
}
@ -78,6 +82,8 @@ class DatabaseLockDriver implements ILockDriver
*/
public function releaseAll()
{
dba::update('locks', ['locked' => false, 'pid' => 0], ['pid' => getmypid()]);
dba::delete('locks', ['locked' => false, 'pid' => 0], ['pid' => getmypid()]);
$this->acquiredLocks = [];
}
}

10
src/Util/Lock/ILockDriver.php → src/Core/Lock/ILockDriver.php
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@ -1,6 +1,6 @@
<?php
namespace Friendica\Util\Lock;
namespace Friendica\Core\Lock;
/**
* Lock Driver Interface
@ -18,16 +18,16 @@ interface ILockDriver
*
* @return boolean Was the lock successful?
*/
public function acquireLock($key, $timeout = 120);
public function acquireLock(string $key, int $timeout = 120);
/**
* @brief Releases a lock if it was set by us
*
* @param string $key Name of the lock
* @param string $key The Name of the lock
*
* @return mixed
* @return void
*/
public function releaseLock($key);
public function releaseLock(string $key);
/**
* @brief Releases all lock that were set by us

68
src/Core/Lock/SemaphoreLockDriver.php Normal file
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@ -0,0 +1,68 @@
<?php
namespace Friendica\Core\Lock;
class SemaphoreLockDriver extends AbstractLockDriver
{
public function __construct()
{
if (!function_exists('sem_get')) {
throw new \Exception('Semaphore lock not supported');
}
}
/**
* @brief Creates a semaphore key
*
* @param string $key Name of the lock
*
* @return integer the semaphore key
*/
private static function semaphoreKey(string $key): int
{
$temp = get_temppath();
$file = $temp.'/'.$key.'.sem';
if (!file_exists($file)) {
file_put_contents($file, $key);
}
return ftok($file, 'f');
}
/**
*
* @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?
*/
public function acquireLock(string $key, int $timeout = 120)
{
$this->acquiredLocks[$key] = sem_get(self::semaphoreKey($key));
if ($this->acquiredLocks[$key]) {
return sem_acquire($this->acquiredLocks[$key], ($timeout == 0));
}
}
/**
* @brief Removes a lock if it was set by us
*
* @param string $key Name of the lock
*
* @return mixed
*/
public function releaseLock(string $key)
{
if (empty($this->acquiredLocks[$key])) {
return false;
} else {
$success = @sem_release($this->acquiredLocks[$key]);
unset($this->acquiredLocks[$key]);
return $success;
}
}
}

2
src/Core/Worker.php
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@ -7,10 +7,10 @@ namespace Friendica\Core;
use Friendica\Core\Addon;
use Friendica\Core\Config;
use Friendica\Core\System;
use Friendica\Core\Lock;
use Friendica\Database\DBM;
use Friendica\Model\Process;
use Friendica\Util\DateTimeFormat;
use Friendica\Util\Lock;
use Friendica\Util\Network;
use dba;

2
src/Protocol/OStatus.php
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@ -9,6 +9,7 @@ use Friendica\Content\Text\HTML;
use Friendica\Core\Cache;
use Friendica\Core\Config;
use Friendica\Core\L10n;
use Friendica\Core\Lock;
use Friendica\Core\System;
use Friendica\Database\DBM;
use Friendica\Model\Contact;
@ -19,7 +20,6 @@ use Friendica\Model\User;
use Friendica\Network\Probe;
use Friendica\Object\Image;
use Friendica\Util\DateTimeFormat;
use Friendica\Util\Lock;
use Friendica\Util\Network;
use Friendica\Util\XML;
use dba;

97
src/Util/Lock.php
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@ -1,97 +0,0 @@
<?php
/**
* @file src/Util/Lock.php
*/
namespace Friendica\Util;
/**
* @file src/Util/Lock.php
* @brief Functions for preventing parallel execution of functions
*/
use Friendica\Core\Config;
use Friendica\Util\Lock;
require_once 'include/dba.php';
/**
* @brief This class contain Functions for preventing parallel execution of functions
*/
class Lock
{
/**
* @var Lock\ILockDriver;
*/
static $driver = null;
public static function init()
{
switch(Config::get('system', 'lock_driver', 'default')) {
case 'memcache':
self::$driver = new Lock\MemcacheLockDriver();
break;
case 'database':
self::$driver = new Lock\DatabaseLockDriver();
break;
case 'semaphore':
self::$driver = new Lock\SemaphoreLockDriver();
break;
default:
// Determine what's the best/fastest locking driver (default behavior in Friendica)
if (function_exists('sem_get') && version_compare(PHP_VERSION, '5.6.1', '>=')) {
self::$driver = new Lock\SemaphoreLockDriver();
} elseif (Config::get('system', 'cache_driver', 'database') == 'memcache') {
self::$driver = new Lock\MemcacheLockDriver();
} else {
self::$driver = new Lock\DatabaseLockDriver();
}
}
}
/**
* Returns the current cache driver
*
* @return Lock\ILockDriver;
*/
private static function getDriver()
{
if (self::$driver === null) {
self::init();
}
return self::$driver;
}
/**
* @brief Acquires a lock for a given name
*
* @param string $key Name of the lock
* @param integer $timeout Seconds until we give up
*
* @return boolean Was the lock successful?
*/
public static function acquireLock($key, $timeout = 120)
{
return self::getDriver()->acquireLock($key, $timeout);
}
/**
* @brief Releases a lock if it was set by us
*
* @param string $key Name of the lock
* @return mixed
*/
public static function releaseLock($key)
{
return self::getDriver()->releaseLock($key);
}
/**
* @brief Releases all lock that were set by us
* @return void
*/
public static function releaseAll()
{
self::getDriver()->releaseAll();
}
}

82
src/Util/Lock/SemaphoreLockDriver.php
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@ -1,82 +0,0 @@
<?php
namespace Friendica\Util\Lock;
class SemaphoreLockDriver implements ILockDriver
{
/**
* @var array stored semaphores
*/
private static $semaphore = [];
/**
* @brief Creates a semaphore key
*
* @param string $key Name of the lock
*
* @return integer the semaphore key
*/
private static function semaphoreKey($key)
{
$temp = get_temppath();
$file = $temp.'/'.$key.'.sem';
if (!file_exists($file)) {
file_put_contents($file, $key);
}
return ftok($file, 'f');
}
/**
*
* @brief Sets a lock for a given name
*
* @param string $key The Name of the lock
* @param integer $timeout Seconds until we give up
*
* @return boolean Was the lock successful?
*/
public function acquireLock($key, $timeout = 120)
{
// The second parameter for "sem_acquire" doesn't exist before 5.6.1
if (function_exists('sem_get') && version_compare(PHP_VERSION, '5.6.1', '>=')) {
self::$semaphore[$key] = sem_get(self::semaphoreKey($key));
if (self::$semaphore[$key]) {
return sem_acquire(self::$semaphore[$key], ($timeout == 0));
}
}
}
/**
* @brief Removes a lock if it was set by us
*
* @param string $key Name of the lock
*
* @return mixed
*/
public function releaseLock($key)
{
if (function_exists('sem_get') && version_compare(PHP_VERSION, '5.6.1', '>=')) {
if (empty(self::$semaphore[$key])) {
return false;
} else {
$success = @sem_release(self::$semaphore[$key]);
unset(self::$semaphore[$key]);
return $success;
}
}
}
/**
* @brief Removes all lock that were set by us
*
* @return void
*/
public function releaseAll()
{
// not needed/supported
return;
}
}