SavepointPostgres.php

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<?php
use Psr\Log\LoggerInterface;

class SavepointPostgres {
    protected $dbw;
    protected $logger;
    protected $id;
    protected $didbegin;

    public function __construct( DatabasePostgres $dbw, $id, LoggerInterface $logger ) {
        $this->dbw = $dbw;
        $this->logger = $logger;
        $this->id = $id;
        $this->didbegin = false;
        /* If we are not in a transaction, we need to be for savepoint trickery */
        if ( !$dbw->trxLevel() ) {
            $dbw->begin( __CLASS__, DatabasePostgres::TRANSACTION_INTERNAL );
            $this->didbegin = true;
        }
    }

    public function __destruct() {
        if ( $this->didbegin ) {
            $this->dbw->rollback();
            $this->didbegin = false;
        }
    }

    public function commit() {
        if ( $this->didbegin ) {
            $this->dbw->commit( __CLASS__, DatabasePostgres::FLUSHING_INTERNAL );
            $this->didbegin = false;
        }
    }

    protected function query( $keyword, $msg_ok, $msg_failed ) {
        if ( $this->dbw->doQuery( $keyword . " " . $this->id ) !== false ) {
            $this->logger->debug( sprintf( $msg_ok, $this->id ) );
        } else {
            $this->logger->debug( sprintf( $msg_failed, $this->id ) );
        }
    }

    public function savepoint() {
        $this->query( "SAVEPOINT",
            "Transaction state: savepoint \"%s\" established.\n",
            "Transaction state: establishment of savepoint \"%s\" FAILED.\n"
        );
    }

    public function release() {
        $this->query( "RELEASE",
            "Transaction state: savepoint \"%s\" released.\n",
            "Transaction state: release of savepoint \"%s\" FAILED.\n"
        );
    }

    public function rollback() {
        $this->query( "ROLLBACK TO",
            "Transaction state: savepoint \"%s\" rolled back.\n",
            "Transaction state: rollback of savepoint \"%s\" FAILED.\n"
        );
    }

    public function __toString() {
        return (string)$this->id;
    }
}