/**
* Helper function check the connection to the database, verify a few conditions (minimum version, etc...) and (if connected)
* enumerate the existing databases (if possible)
* @return mixed false if the connection failed or array('checks' => Array of CheckResult, 'databases' => Array of database names (as strings) or null if not allowed)
*/
static function CheckServerConnection($sDBServer, $sDBUser, $sDBPwd)
{
$aResult = array('checks' => array(), 'databases' => null);
try {
$oDBSource = new CMDBSource();
$oDBSource->Init($sDBServer, $sDBUser, $sDBPwd);
$aResult['checks'][] = new CheckResult(CheckResult::INFO, "Connection to '{$sDBServer}' as '{$sDBUser}' successful.");
$aResult['checks'][] = new CheckResult(CheckResult::INFO, "Info - User privileges: " . $oDBSource->GetRawPrivileges());
$sDBVersion = $oDBSource->GetDBVersion();
if (version_compare($sDBVersion, self::MYSQL_MIN_VERSION, '>=')) {
$aResult['checks'][] = new CheckResult(CheckResult::INFO, "Current MySQL version ({$sDBVersion}), greater than minimum required version (" . self::MYSQL_MIN_VERSION . ")");
// Check some server variables
$iMaxAllowedPacket = $oDBSource->GetServerVariable('max_allowed_packet');
$iMaxUploadSize = utils::ConvertToBytes(ini_get('upload_max_filesize'));
if ($iMaxAllowedPacket >= 500 + $iMaxUploadSize) {
$aResult['checks'][] = new CheckResult(CheckResult::INFO, "MySQL server's max_allowed_packet ({$iMaxAllowedPacket}) is big enough compared to upload_max_filesize ({$iMaxUploadSize}).");
} else {
if ($iMaxAllowedPacket < $iMaxUploadSize) {
$aResult['checks'][] = new CheckResult(CheckResult::WARNING, "MySQL server's max_allowed_packet ({$iMaxAllowedPacket}) is not big enough. Please, consider setting it to at least " . (500 + $iMaxUploadSize) . ".");
}
}
$iMaxConnections = $oDBSource->GetServerVariable('max_connections');
if ($iMaxConnections < 5) {
$aResult['checks'][] = new CheckResult(CheckResult::WARNING, "MySQL server's max_connections ({$iMaxConnections}) is not enough. Please, consider setting it to at least 5.");
} else {
$aResult['checks'][] = new CheckResult(CheckResult::INFO, "MySQL server's max_connections is set to {$iMaxConnections}.");
}
} else {
$aResult['checks'][] = new CheckResult(CheckResult::ERROR, "Error: Current MySQL version is ({$sDBVersion}), minimum required version (" . self::MYSQL_MIN_VERSION . ")");
}
try {
$aResult['databases'] = $oDBSource->ListDB();
} catch (Exception $e) {
$aResult['databases'] = null;
}
} catch (Exception $e) {
return false;
}
return $aResult;
}