libphp-pgq/PGQEventRemoteConsumer.php at master · gletournel/libphp-pgq · GitHub

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<?php
require_once __DIR__ . '/PGQRemoteConsumer.php';

/**
 * PGQEventRemoteConsumer is a PGQRemoteConsumer which handles nested
 * transactions for event management, allowing the remote processing
 * to be commited or rollbacked at event level.
 */
abstract class PGQEventRemoteConsumer extends PGQRemoteConsumer
{
    /**
     * @param PGQEvent $event
     *
     * @return string
     */
    public function get_savepoint($event)
    {
        return sprintf("pgq_event_%d", $event->id);
    }

    /**
     * {@inheritdoc}
     */
    public function preprocess_event($event)
    {
        $sql_savepoint = sprintf("SAVEPOINT %s", $this->get_savepoint($event));
        $this->log->debug($sql_savepoint);

        if (pg_query($this->pg_dst_con, $sql_savepoint) === false) {
            $this->log->warning(
                "PGQEventRemoteConsumer.preprocess_event could not place SAVEPOINT for event %d",
                $event->id
            );
            return PGQ_ABORT_BATCH;
        }
        return true;
    }

    /**
     * {@inheritdoc}
     */
    public function postprocess_event($event)
    {
        $savepoint = $this->get_savepoint($event);

        switch ($event->tag) {
            case PGQ_EVENT_OK:
                $sql_release = sprintf("RELEASE SAVEPOINT %s", $savepoint);
                $this->log->debug($sql_release);
                $result = pg_query($this->pg_dst_con, $sql_release);

                if ($result === false) {
                    $this->log->notice("Could not release savepoint %s", $savepoint);
                    return PGQ_ABORT_BATCH;
                }
                break;

            case PGQ_EVENT_FAILED:
                $sql_rollback = sprintf("ROLLBACK TO SAVEPOINT %s", $savepoint);
                $this->log->debug($sql_rollback);
                $result = pg_query($this->pg_dst_con, $sql_rollback);

                if ($result === false) {
                    $this->log->notice("Could not rollback to savepoint %s", $savepoint);
                    return PGQ_ABORT_BATCH;
                }
                break;

            case PGQ_EVENT_RETRY:
                $sql_rollback = sprintf("ROLLBACK TO SAVEPOINT %s", $savepoint);
                $this->log->debug($sql_rollback);
                $result = pg_query($this->pg_dst_con, $sql_rollback);

                if ($result === false) {
                    $this->log->notice("Could not tollback to savepoint %s", $savepoint);
                    return PGQ_ABORT_BATCH;
                }
                break;
        }
        return true;
    }
}