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<?php
/**
* Replication helpers
*/
declare(strict_types=1);
namespace PhpMyAdmin;
use PhpMyAdmin\Dbal\ResultInterface;
use function explode;
use function mb_strtoupper;
/**
* PhpMyAdmin\Replication class
*/
class Replication
{
/**
* Extracts database or table name from string
*
* @param string $string contains "dbname.tablename"
* @param string $what what to extract (db|table)
*
* @return string the extracted part
*/
public function extractDbOrTable($string, $what = 'db')
{
$list = explode('.', $string);
if ($what === 'db') {
return $list[0];
}
return $list[1];
}
/**
* Configures replication replica
*
* @param string $action possible values: START or STOP
* @param string|null $control default: null,
* possible values: SQL_THREAD or IO_THREAD or null.
* If it is set to null, it controls both
* SQL_THREAD and IO_THREAD
* @param int $link mysql link
*
* @return ResultInterface|false|int output of DatabaseInterface::tryQuery
*/
public function replicaControl(string $action, ?string $control, int $link)
{
global $dbi;
$action = mb_strtoupper($action);
$control = $control !== null ? mb_strtoupper($control) : '';
if ($action !== 'START' && $action !== 'STOP') {
return -1;
}
if ($control !== 'SQL_THREAD' && $control !== 'IO_THREAD' && $control != null) {
return -1;
}
return $dbi->tryQuery($action . ' SLAVE ' . $control . ';', $link);
}
/**
* Changes primary for replication replica
*
* @param string $user replication user on primary
* @param string $password password for the user
* @param string $host primary's hostname or IP
* @param int $port port, where mysql is running
* @param array $pos position of mysql replication, array should contain fields File and Position
* @param bool $stop shall we stop replica?
* @param bool $start shall we start replica?
* @param int $link mysql link
*
* @return ResultInterface|false output of CHANGE MASTER mysql command
*/
public function replicaChangePrimary(
$user,
$password,
$host,
$port,
array $pos,
bool $stop,
bool $start,
int $link
) {
global $dbi;
if ($stop) {
$this->replicaControl('STOP', null, $link);
}
$out = $dbi->tryQuery(
'CHANGE MASTER TO ' .
'MASTER_HOST=\'' . $host . '\',' .
'MASTER_PORT=' . ($port * 1) . ',' .
'MASTER_USER=\'' . $user . '\',' .
'MASTER_PASSWORD=\'' . $password . '\',' .
'MASTER_LOG_FILE=\'' . $pos['File'] . '\',' .
'MASTER_LOG_POS=' . $pos['Position'] . ';',
$link
);
if ($start) {
$this->replicaControl('START', null, $link);
}
return $out;
}
/**
* This function provides connection to remote mysql server
*
* @param string $user mysql username
* @param string $password password for the user
* @param string $host mysql server's hostname or IP
* @param int $port mysql remote port
* @param string $socket path to unix socket
*
* @return mixed mysql link on success
*/
public function connectToPrimary(
$user,
$password,
$host = null,
$port = null,
$socket = null
) {
global $dbi;
$server = [];
$server['user'] = $user;
$server['password'] = $password;
$server['host'] = Core::sanitizeMySQLHost($host);
$server['port'] = $port;
$server['socket'] = $socket;
// 5th parameter set to true means that it's an auxiliary connection
// and we must not go back to login page if it fails
return $dbi->connect(DatabaseInterface::CONNECT_AUXILIARY, $server);
}
/**
* Fetches position and file of current binary log on primary
*
* @param int $link mysql link
*
* @return array an array containing File and Position in MySQL replication
* on primary server, useful for {@see Replication::replicaChangePrimary()}.
* @phpstan-return array{'File'?: string, 'Position'?: string}
*/
public function replicaBinLogPrimary(int $link): array
{
global $dbi;
$data = $dbi->fetchResult('SHOW MASTER STATUS', null, null, $link);
$output = [];
if (! empty($data)) {
$output['File'] = $data[0]['File'];
$output['Position'] = $data[0]['Position'];
}
return $output;
}
}
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