vendor/illuminate/database/Concerns/ManagesTransactions.php

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<?php

namespace Illuminate\Database\Concerns;

use Closure;
use Exception;
use Throwable;

trait ManagesTransactions
{
    /**
     * Execute a Closure within a transaction.
     *
     * @param  \Closure  $callback
     * @param  int  $attempts
     * @return mixed
     *
     * @throws \Exception|\Throwable
     */
    public function transaction(Closure $callback, $attempts = 1)
    {
        for ($currentAttempt = 1; $currentAttempt <= $attempts; $currentAttempt++) {
            $this->beginTransaction();

            // We'll simply execute the given callback within a try / catch block and if we
            // catch any exception we can rollback this transaction so that none of this
            // gets actually persisted to a database or stored in a permanent fashion.
            try {
                return tap($callback($this), function () {
                    $this->commit();
                });
            }

            // If we catch an exception we'll rollback this transaction and try again if we
            // are not out of attempts. If we are out of attempts we will just throw the
            // exception back out and let the developer handle an uncaught exceptions.
            catch (Exception $e) {
                $this->handleTransactionException(
                    $e, $currentAttempt, $attempts
                );
            } catch (Throwable $e) {
                $this->rollBack();

                throw $e;
            }
        }
    }

    /**
     * Handle an exception encountered when running a transacted statement.
     *
     * @param  \Exception  $e
     * @param  int  $currentAttempt
     * @param  int  $maxAttempts
     * @return void
     *
     * @throws \Exception
     */
    protected function handleTransactionException($e, $currentAttempt, $maxAttempts)
    {