Rename *CacheDriver to *Cache because they don't act as driver anymore

src/Core/Lock/DatabaseLock.php

@@ -0,0 +1,117 @@
+<?php
+
+namespace Friendica\Core\Lock;
+
+use Friendica\Core\Cache;
+use Friendica\Database\Database;
+use Friendica\Util\DateTimeFormat;
+
+/**
+ * Locking driver that stores the locks in the database
+ */
+class DatabaseLock extends AbstractLock
+{
+	/**
+	 * The current ID of the process
+	 *
+	 * @var int
+	 */
+	private $pid;
+
+	/**
+	 * @var Database The database connection of Friendica
+	 */
+	private $dba;
+
+	/**
+	 * @param null|int $pid The Id of the current process (null means determine automatically)
+	 */
+	public function __construct(Database $dba, $pid = null)
+	{
+		$this->dba = $dba;
+		$this->pid = isset($pid) ? $pid : getmypid();
+	}
+
+	/**
+	 * (@inheritdoc)
+	 */
+	public function acquireLock($key, $timeout = 120, $ttl = Cache::FIVE_MINUTES)
+	{
+		$got_lock = false;
+		$start    = time();
+
+		do {
+			$this->dba->lock('locks');
+			$lock = $this->dba->selectFirst('locks', ['locked', 'pid'], ['`name` = ? AND `expires` >= ?', $key, DateTimeFormat::utcNow()]);
+
+			if ($this->dba->isResult($lock)) {
+				if ($lock['locked']) {
+					// We want to lock something that was already locked by us? So we got the lock.
+					if ($lock['pid'] == $this->pid) {
+						$got_lock = true;
+					}
+				}
+				if (!$lock['locked']) {
+					$this->dba->update('locks', ['locked' => true, 'pid' => $this->pid, 'expires' => DateTimeFormat::utc('now + ' . $ttl . 'seconds')], ['name' => $key]);
+					$got_lock = true;
+				}
+			} else {
+				$this->dba->insert('locks', ['name' => $key, 'locked' => true, 'pid' => $this->pid, 'expires' => DateTimeFormat::utc('now + ' . $ttl . 'seconds')]);
+				$got_lock = true;
+				$this->markAcquire($key);
+			}
+
+			$this->dba->unlock();
+
+			if (!$got_lock && ($timeout > 0)) {
+				usleep(rand(100000, 2000000));
+			}
+		} while (!$got_lock && ((time() - $start) < $timeout));
+
+		return $got_lock;
+	}
+
+	/**
+	 * (@inheritdoc)
+	 */
+	public function releaseLock($key, $override = false)
+	{
+		if ($override) {
+			$where = ['name' => $key];
+		} else {
+			$where = ['name' => $key, 'pid' => $this->pid];
+		}
+
+		$return = $this->dba->delete('locks', $where);
+
+		$this->markRelease($key);
+
+		return $return;
+	}
+
+	/**
+	 * (@inheritdoc)
+	 */
+	public function releaseAll()
+	{
+		$return = $this->dba->delete('locks', ['pid' => $this->pid]);
+
+		$this->acquiredLocks = [];
+
+		return $return;
+	}
+
+	/**
+	 * (@inheritdoc)
+	 */
+	public function isLocked($key)
+	{
+		$lock = $this->dba->selectFirst('locks', ['locked'], ['`name` = ? AND `expires` >= ?', $key, DateTimeFormat::utcNow()]);
+
+		if ($this->dba->isResult($lock)) {
+			return $lock['locked'] !== false;
+		} else {
+			return false;
+		}
+	}
+}