<?php

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namespace WPML\Utilities;

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class Lock implements ILock {

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/** @var \wpdb */

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private $wpdb;

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/** @var string */

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protected $name;

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/**

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* Lock constructor.

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*

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* @param \wpdb $wpdb

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* @param string $name

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*/

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public function __construct( \wpdb $wpdb, $name ) {

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$this->wpdb = $wpdb;

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$this->name = 'wpml.' . $name . '.lock';

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}

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/**

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* Creates a lock using WordPress options ( Based on WP class WP_Upgrader ).

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*

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* @param int $release_timeout Optional. The duration in seconds to respect an existing lock.

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* Default: 1 hour.

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* @return bool False if a lock couldn't be created or if the lock is still valid. True otherwise.

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*/

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public function create( $release_timeout = null ) {

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if ( ! $release_timeout ) {

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$release_timeout = HOUR_IN_SECONDS;

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}

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// Try to lock.

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$lock_result = $this->wpdb->query( $this->wpdb->prepare( "INSERT IGNORE INTO {$this->wpdb->options} ( `option_name`, `option_value`, `autoload` ) VALUES (%s, %s, 'no') /* LOCK */", $this->name, time() ) );

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if ( ! $lock_result ) {

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$lock_result = get_option( $this->name );

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// If a lock couldn't be created, and there isn't a lock, bail.

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if ( ! $lock_result ) {

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return false;

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}

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// Check to see if the lock is still valid. If it is, bail.

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if ( $lock_result > ( time() - $release_timeout ) ) {

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return false;

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}

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// There must exist an expired lock, clear it and re-gain it.

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$this->release();

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return $this->create( $release_timeout );

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}

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// Update the lock, as by this point we've definitely got a lock, just need to fire the actions.

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update_option( $this->name, time() );

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return true;

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}

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/**

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* Releases an upgrader lock.

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*

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* @return bool True if the lock was successfully released. False on failure.

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*/

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public function release() {

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return delete_option( $this->name );

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}

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}

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