/**
* Get instance of class
*
* @param bool $check If true - checks, if instance was already created, if not - instance of cs\False_class will be returned
*
* @return False_class|static
*/
static function instance($check = false)
{
static $instance;
if (defined('STOP')) {
return False_class::instance();
}
if ($check) {
return isset($instance) ? $instance : False_class::instance();
}
if (isset($instance)) {
return $instance;
}
$class = ltrim(get_called_class(), '\\');
if (substr($class, 0, 2) == 'cs' && class_exists('cs\\custom' . substr($class, 2), false)) {
$instance = 'cs\\custom' . substr($class, 2);
$instance = $instance::instance();
} else {
$instance = new static();
}
$instance->construct();
return $instance;
}
/**
* Processing of all storage requests
*
* @param int $connection
*
* @return Storage\_Abstract|False_class
*/
protected function connecting($connection)
{
/**
* If connection found in list of failed connections - return instance of False_class
*/
if (isset($this->failed_connections[$connection])) {
return False_class::instance();
}
/**
* If connection already exists - return reference on the instance of Storage engine object
*/
if (isset($this->connections[$connection])) {
return $this->connections[$connection];
}
$Config = Config::instance();
/**
* If connection to the local storage
*/
if ($connection == 0) {
$Core = Core::instance();
$storage['connection'] = $Core->storage_type;
$storage['url'] = $Core->storage_url;
$storage['host'] = $Core->storage_host;
$storage['user'] = $Core->storage_user;
$storage['password'] = $Core->storage_password;
} elseif (isset($Config->storage[$connection])) {
$storage =& $Config->storage[$connection];
} else {
return False_class::instance();
}
/**
* Create new Storage connection
*/
$engine_class = '\\cs\\Storage\\' . $storage['connection'];
$this->connections[$connection] = new $engine_class($storage['url'], $storage['host'], $storage['user'], $storage['password']);
/**
* If successfully - add connection to the list of success connections and return instance of DB engine object
*/
if (is_object($this->connections[$connection]) && $this->connections[$connection]->connected()) {
$this->successful_connections[] = $connection . '/' . $storage['host'] . '/' . $storage['connection'];
unset($storage);
$this->{$connection} = $this->connections[$connection];
return $this->connections[$connection];
/**
* If failed - add connection to the list of failed connections and display connection error
*/
} else {
unset($this->{$connection});
$this->failed_connections[$connection] = $connection . '/' . $storage['host'] . '/' . $storage['connection'];
unset($storage);
trigger_error(Language::instance()->error_storage . ' ' . $this->failed_connections[$connection], E_USER_WARNING);
$return = False_class::instance();
$return->error = 'Connection failed';
return $return;
}
}
/**
* Processing of all DB request
*
* @param int $connection Database id
* @param array|bool $mirror
*
* @return DB\_Abstract|False_class
*/
protected function connecting($connection, $mirror = true)
{
/**
* If connection found in list of failed connections - return instance of False_class
*/
if (isset($this->failed_connections[$connection])) {
return False_class::instance();
}
/**
* If we want to get data and connection with DB mirror already exists - return reference on the instance of DB engine object
*/
if ($mirror === true && isset($this->mirrors[$connection])) {
return $this->mirrors[$connection];
}
/**
* If connection already exists - return reference on the instance of DB engine object
*/
if (isset($this->connections[$connection])) {
return $this->connections[$connection];
}
$Config = Config::instance();
$Core = Core::instance();
$L = Language::instance();
/**
* If connection to the core DB and it is not connection to the mirror
*/
if ($connection == 0 && !is_array($mirror)) {
$db['type'] = $Core->db_type;
$db['name'] = $Core->db_name;
$db['user'] = $Core->db_user;
$db['password'] = $Core->db_password;
$db['host'] = $Core->db_host;
$db['charset'] = $Core->db_charset;
$db['prefix'] = $Core->db_prefix;
} else {
/**
* If it is connection to the DB mirror
*/
if (is_array($mirror)) {
$db =& $mirror;
} else {
if (!isset($Config->db[$connection]) || !is_array($Config->db[$connection])) {
return False_class::instance();
}
$db =& $Config->db[$connection];
}
}
/**
* Create new DB connection
*/
$engine_class = '\\cs\\DB\\' . $db['type'];
$this->connections[$connection] = new $engine_class($db['name'], $db['user'], $db['password'], $db['host'], $db['charset'], $db['prefix']);
unset($engine_class);
/**
* If successfully - add connection to the list of success connections and return instance of DB engine object
*/
if (is_object($this->connections[$connection]) && $this->connections[$connection]->connected()) {
$this->successful_connections[] = ($connection == 0 ? $L->core_db . '(' . $Core->db_type . ')' : $connection) . '/' . $db['host'] . '/' . $db['type'];
unset($db);
$this->{$connection} = $this->connections[$connection];
return $this->connections[$connection];
/**
* If failed - add connection to the list of failed connections and try to connect to the DB mirror if it is allowed
*/
} else {
unset($this->{$connection});
$this->failed_connections[$connection] = ($connection == 0 ? $L->core_db . '(' . $Core->db_type . ')' : $connection) . '/' . $db['host'] . '/' . $db['type'];
unset($db);
if ($mirror === true && ($connection == 0 && isset($Config->db[0]['mirrors']) && is_array($Config->db[0]['mirrors']) && count($Config->db[0]['mirrors']) || isset($Config->db[$connection]['mirrors']) && is_array($Config->db[$connection]['mirrors']) && count($Config->db[$connection]['mirrors']))) {
$dbx = $connection == 0 ? $Config->db[0]['mirrors'] : $Config->db[$connection]['mirrors'];
foreach ($dbx as $i => &$mirror_data) {
$mirror_connection = $this->connecting($connection . ' (' . $mirror_data['name'] . ')', $mirror_data);
if (is_object($mirror_connection) && $mirror_connection->connected()) {
$this->mirrors[$connection] = $mirror_connection;
$this->{$connection} = $this->connections[$connection];
return $this->mirrors[$connection];
}
}
unset($dbx, $i, $mirror_data, $mirror_connection);
}
/**
* If mirror connection is not allowed - display connection error
*/
$return = False_class::instance();
if (!is_array($mirror)) {
code_header(500);
if ($connection == 0) {
trigger_error($L->error_core_db, E_USER_ERROR);
} else {
trigger_error($L->error_db . ' ' . $this->failed_connections[$connection], E_USER_ERROR);
}
$return->error = 'Connection failed';
}
return $return;
}
}
