composer require dmt-software/command-bus-validator
By default this middleware uses the StaticMethodLoader of the Symfony Validator component.
If you have installed both doctrine/annotations and doctrine/cache, this default behaviour is extended with the AnnotationLoader.
Configure and adding this middleware to the commandBus:
<?php // src/CommandBus/builder.php
use DMT\CommandBus\Validator\ValidationMiddleware;
use League\Tactician\CommandBus;
use League\Tactician\Handler\CommandHandlerMiddleware;
/** @var CommandHandlerMiddleware $commandHandlerMiddleware */
$commandBus = new CommandBus(
[
new ValidationMiddleware(),
$commandHandlerMiddleware
]
);After the CommandBus is added, the commands it receives will be validated when the handle method is called:
<?php
use DMT\CommandBus\Validator\ValidationException;
use League\Tactician\CommandBus;
try {
/** @var object $command */
/** @var CommandBus $commandBus */
$result = $commandBus->handle($command);
} catch (ValidationException $exception) {
$violations = $exception->getViolations();
foreach ($violations as $violation) {
echo $violation->getMessage(); // outputs: the violation message(s)
}
}The validator can also be plugged unto the middleware by providing it to the middleware constructor.
This example uses a FileLoader to determine the constraints for a command.
<?php // src/CommandBus/builder.php
use DMT\CommandBus\Validator\ValidationMiddleware;
use League\Tactician\CommandBus;
use League\Tactician\Handler\CommandHandlerMiddleware;
use Symfony\Component\Validator\ValidatorBuilder;
$validator = (new ValidatorBuilder())
->addYamlMapping('config/validation.yaml')
->getValidator();
/** @var CommandHandlerMiddleware $commandHandlerMiddleware */
$commandBus = new CommandBus(
[
new ValidationMiddleware($validator),
$commandHandlerMiddleware
]
);