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<?php
/**
* WPSEO plugin file.
*
* @package WPSEO\Admin\Links
*/
/**
* Represents the state of the table being accessible.
*/
class WPSEO_Meta_Table_Accessible {
/**
* Indicates that the table is accessible.
*
* @var string
*/
const ACCESSIBLE = '0';
/**
* Indicates that the table is inaccessible.
*
* @var string
*/
const INACCESSBILE = '1';
/**
* Checks if the given table name exists.
*
* @return bool True when table is accessible.
*/
public static function is_accessible() {
$value = get_transient( self::transient_name() );
// If the value is not set, check the table.
if ( false === $value ) {
return self::check_table();
}
return $value === self::ACCESSIBLE;
}
/**
* Sets the transient value to 1, to indicate the table is not accessible.
*
* @return void
*/
public static function set_inaccessible() {
set_transient( self::transient_name(), self::INACCESSBILE, HOUR_IN_SECONDS );
}
/**
* Removes the transient.
*
* @return void
*/
public static function cleanup() {
delete_transient( self::transient_name() );
}
/**
* Sets the transient value to 0, to indicate the table is accessible.
*
* @return void
*/
protected static function set_accessible() {
/*
* Prefer to set a 0 timeout, but if the timeout was set before WordPress will not delete the transient
* correctly when overridden with a zero value.
*
* Setting a YEAR_IN_SECONDS instead.
*/
set_transient( self::transient_name(), self::ACCESSIBLE, YEAR_IN_SECONDS );
}
/**
* Checks if the table exists if not, set the transient to indicate the inaccessible table.
*
* @return bool True if table is accessible.
*/
protected static function check_table() {
global $wpdb;
$storage = new WPSEO_Meta_Storage();
$query = $wpdb->prepare( 'SHOW TABLES LIKE %s', $storage->get_table_name() );
if ( $wpdb->get_var( $query ) !== $storage->get_table_name() ) {
self::set_inaccessible();
return false;
}
self::set_accessible();
return true;
}
/**
* Returns the name of the transient.
*
* @return string The name of the transient to use.
*/
protected static function transient_name() {
return 'wpseo_meta_table_inaccessible';
}
}
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