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<?php |
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declare(strict_types=1); |
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namespace SetBased\Stratum\MySql\Backend; |
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use SetBased\Stratum\Backend\Config; |
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use SetBased\Stratum\Backend\StratumStyle; |
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use SetBased\Stratum\MySql\Exception\MySqlConnectFailedException; |
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use SetBased\Stratum\MySql\Exception\MySqlDataLayerException; |
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use SetBased\Stratum\MySql\MySqlDataLayer; |
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use SetBased\Stratum\MySql\MySqlDefaultConnector; |
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use SetBased\Stratum\MySql\MySqlMetaDataLayer; |
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use Symfony\Component\Console\Formatter\OutputFormatter; |
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/** |
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* Base class for commands which needs a connection to a MySQL instance. |
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*/ |
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class MySqlWorker |
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{ |
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//-------------------------------------------------------------------------------------------------------------------- |
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/** |
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* The meta data layer. |
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* |
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* @var MySqlMetaDataLayer |
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*/ |
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protected $dl; |
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/** |
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* The output object. |
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* |
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* @var StratumStyle |
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*/ |
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protected $io; |
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/** |
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* The settings from the PhpStratum configuration file. |
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* |
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* @var Config |
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*/ |
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protected $settings; |
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//-------------------------------------------------------------------------------------------------------------------- |
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/** |
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* Object constructor. |
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* |
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* @param Config $settings The settings from the PhpStratum configuration file. |
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* @param StratumStyle $io The output object. |
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*/ |
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public function __construct(Config $settings, StratumStyle $io) |
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{ |
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$this->settings = $settings; |
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$this->io = $io; |
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} |
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//-------------------------------------------------------------------------------------------------------------------- |
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/** |
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* Disconnects from MySQL instance. |
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*/ |
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public function disconnect() |
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{ |
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if ($this->dl!==null) |
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{ |
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$this->dl->disconnect(); |
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$this->dl = null; |
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} |
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} |
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//-------------------------------------------------------------------------------------------------------------------- |
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/** |
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* Connects to a MySQL instance. |
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* |
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* @throws MySqlConnectFailedException |
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* @throws MySqlDataLayerException |
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*/ |
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protected function connect(): void |
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{ |
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$host = $this->settings->manString('database.host'); |
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$user = $this->settings->manString('database.user'); |
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$password = $this->settings->manString('database.password'); |
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$database = $this->settings->manString('database.database'); |
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$port = $this->settings->manInt('database.port', 3306); |
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$connector = new MySqlDefaultConnector($host, $user, $password, $database, $port); |
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$dataLayer = new MySqlDataLayer($connector); |
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$dataLayer->connect(); |
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$this->dl = new MySqlMetaDataLayer($dataLayer, $this->io); |
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} |
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//-------------------------------------------------------------------------------------------------------------------- |
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/** |
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* Writes a file in two phase to the filesystem. |
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* |
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* First write the data to a temporary file (in the same directory) and than renames the temporary file. If the file |
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* already exists and its content is equal to the data that must be written no action is taken. This has the |
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* following advantages: |
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* * In case of some write error (e.g. disk full) the original file is kept in tact and no file with partially data |
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* is written. |
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* * Renaming a file is atomic. So, running processes will never read a partially written data. |
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* |
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* @param string $filename The name of the file were the data must be stored. |
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* @param string $data The data that must be written. |
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*/ |
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protected function writeTwoPhases(string $filename, string $data): void |
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{ |
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$write_flag = true; |
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if (file_exists($filename)) |
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{ |
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$old_data = file_get_contents($filename); |
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if ($data==$old_data) $write_flag = false; |
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} |
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if ($write_flag) |
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{ |
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$tmp_filename = $filename.'.tmp'; |
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file_put_contents($tmp_filename, $data); |
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rename($tmp_filename, $filename); |
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$this->io->text(sprintf('Wrote <fso>%s</fso>', OutputFormatter::escape($filename))); |
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} |
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else |
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{ |
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$this->io->text(sprintf('File <fso>%s</fso> is up to date', OutputFormatter::escape($filename))); |
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} |
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} |
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//-------------------------------------------------------------------------------------------------------------------- |
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} |
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//---------------------------------------------------------------------------------------------------------------------- |
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DatabaseStratum /
php-stratum-mysql
