I'm finally doing it. Phalcon's mature enough for me to look at running a small site with it. The performance is already hitting around 5,500 requests per second in my development environment.
Anyway, one of the things I was trying to figure out was how to handle the 404 (Not Found) and 500 (Internal Server Error) within the application.
Needless to say, I figured it out, but to be perfectly honest, it wasn't that bad.
Everything in Phalcon is event driven, and we rely heavily on the Dependency Injection service to feed key pieces of information into our application.
There's a service you can use which basically you can override key parts of the event management system. You'll want to hook into the 'dispatch:beforeException' event, and tell the application to do something else.
In the example below (from my bootstrap file) I essentially tell Phalcon that in the case of:
\Phalcon\Mvc\Dispatcher::EXCEPTION_HANDLER_NOT_FOUND - code 2
or
\Phalcon\Mvc\Dispatcher::Dispatcher::EXCEPTION_ACTION_NOT_FOUND - code 5
Execute my 'ErrorController::notFoundAction'
And for any other type of Exception, execute the 'ErrorController::uncaughtExceptionAction'
<?php
use \Phalcon\Mvc\Dispatcher;
$di = new FactoryDefault();
// some of your di services here
$di->set(
'dispatcher',
function() use ($di) {
$eventsManager = $di->getShared('eventsManager');
$eventsManager->attach(
'dispatch:beforeException',
function($event, $dispatcher, $exception) {
switch ($exception->getCode()) {
case Dispatcher::EXCEPTION_HANDLER_NOT_FOUND:
case Dispatcher::EXCEPTION_ACTION_NOT_FOUND:
$dispatcher->forward(
array(
'controller' => 'error',
'action' => 'notFound',
)
);
return false;
break; // for checkstyle
default:
$dispatcher->forward(
array(
'controller' => 'error',
'action' => 'uncaughtException',
)
);
return false;
break; // for checkstyle
}
}
);
$dispatcher = new Dispatcher();
$dispatcher->setEventsManager($eventsManager);
return $dispatcher;
},
true
);
It's not that terrible, and to ensure completeness of this blog post, here's my ErrorController:
<?php
class ErrorController extends \Phalcon\Mvc\Controller
{
public function notFoundAction()
{
// The response is already populated with a 404 Not Found header.
}
public function uncaughtExceptionAction()
{
// You need to specify the response header, as it's not automatically set here.
$this->response->setStatusCode(500, 'Internal Server Error');
}
}
If you want views, you'll need to create the files in your views folder. The format should be:
views/error/notFound.phtml
views/error/uncaughtException.phtml
As you've probably figured out, this blog is my place to hold sweet pieces of code that I just don't want to rewrite, but hopefully you'll find it useful as well.
Fleta commented on Jul 19th 2016