Legacy applications - 4Developes konferencja, Piotr Pasich

LEGACY APPLICATIONS
Piotr Pasich

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FROM SPAGHETTI TO CODE
czyli dziedziczymy aplikację

DLACZEGO TEGO NIE PRZEPISAĆ?
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dużo kodu
duża ilość funkcjonalności
czas
pieniądze
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PREVENTING REGRESSIONS
czyli nic nie ruszać
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TESTY FUNKCJONALNOŚCI
Selenium IDE, behat, testy jednostkowe
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ŚRODOWISKO
minimum PHP 5.3.3
Sqlite3, JSON, ctype
php app/check.php
date.timezone set in php.ini
Phpcs CodeSniffs
tutaj po raz pierwszy korzystamy z testów
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INSTALACJA SYMFONY 2
katalog legacy
namespace
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namespace Legacy {
(...)
}

LegacyBundle
app/console generate:bundle
Bundle namespace: XsolveLegacyBundle
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AUTOLOADER
<?php
namespace XsolveLegacyBundle;
require_once(__DIR__ . "/../../../legacy/index.php"); //disabled execute::run
use Legacy;
use SymfonyComponentHttpKernelBundleBundle;
use SymfonyComponentDependencyInjectionContainerBuilder;
class XsolveLegacyBundle extends Bundle
{
public function build(ContainerBuilder $container)
{
spl_autoload_register(array('Kohana', 'auto_load'));
}
}
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MainAction
class LegacyController extends Controller
{
/**
* @Route("/", name="main_page")
* @Route("/{filename}.html", name="proxy_html", requirements={"filename" = ".+"})
* @Route("/{filename}", name="proxy", requirements={"filename" = ".+"})
*/
public function indexAction($filename='index')
{
$_SERVER['SCRIPT_URL'] = $filename.'.html';
$_SERVER['REQUEST_URI'] = $filename.'.html';
ob_start();
// include_once ('../legacy/index.php');
Event::run('system.routing');
Benchmark::stop(SYSTEM_BENCHMARK.'_system_initialization');
Event::run('system.execute');
$response = new Response(ob_get_clean());
return $response;
}
}
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KOHANA?
system/core/Bootstrap.php
//Event::run('system.routing');
//Benchmark::stop(SYSTEM_BENCHMARK.'_system_initialization');
//Event::run('system.shutdown');
DIE; //!
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LAYOUT
esi
Varnish
Guzzle Client
Crawler
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ESI + VARNISH
http://todsul.com/symfony2-esi-varnish
framework: { esi: true }
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ESI CONTROLLER
/**
* @Route(name="esi_center_column")
*/
public function getCenterColumnAction(Request $request)
{
$url = $request->get('url'); //almost like proxy.php
$html = $this->get('xsolve.legacy.client')->requestElement($url, '.
span-center');
return $this->get('xsolve.response.cache')->getResponseWithCache
($html, 10);
}
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ESI SERVICE
class LegacyClient
{
(...)
public function requestElement($url, $element)
{
$html = $this->request($url);
return $this->filter($html, $element);
}
(...)
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ESI SERVICE
/**
* @return SymfonyComponentDomCrawlerCrawler
*/
public function request($url)
{
if (!isset($this->response[$url])) {
$client = $this->getClient();
$request = $client->get($url);
$request->setHeader('Cookie', null);
$this->response[$url] = $request->send();
}
return $this->response[$url]->getBody();
}
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ESI SERVICE
/**
* @return GuzzleHttpClient
*/
public function getClient()
{
$client = new Client();
return $client;
}
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ESI SERVICE
public function filter($html, $element)
{
$crawler = new Crawler();
$crawler->addHtmlContent($html);
$crawler = $crawler->filter($element);
$html = '';
foreach ($crawler as $domElement) {
$html.= $domElement->ownerDocument->saveHTML($domElement);
}
return $html;
}
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HOW TO USE IT?
<!DOCTYPE html>
<html>
<esi:include src="{{ path('esi_head') }}" />
<body>
<div class="container with-background">
<esi:include src="{{ path('esi_left_column') }}" />
<div class="span-center">
{% block content %}
{% endblock %}
</div>
<esi:include src="{{ path('esi_right_column') }}" />
<esi:include src="{{ path('esi_footer') }}" />
</div>
</body>
</html>
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REVERSE PROXY CACHE
// app/AppCache.php
require_once __DIR__.'/AppKernel.php';
use SymfonyBundleFrameworkBundleHttpCacheHttpCache;
class AppCache extends HttpCache
{
protected function getOptions()
{
return array(
'debug' => false,
'default_ttl' => 0,
'private_headers' => array('Authorization', 'Cookie'),
'allow_reload' => true,
'allow_revalidate' => false,
'stale_while_revalidate' => 2,
'stale_if_error' => 60,
);
}
}
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REVERSE PROXY CACHE
<?php
// web/app.php
require_once __DIR__.'/../app/bootstrap.php.cache';
require_once __DIR__.'/../app/AppKernel.php';
require_once __DIR__.'/../app/AppCache.php';
use SymfonyComponentHttpFoundationRequest;
$kernel = new AppKernel('prod', false);
$kernel->loadClassCache();
// wrap the default AppKernel with the AppCache one
$kernel = new AppCache($kernel);
$request = Request::createFromGlobals();
$response = $kernel->handle($request);
$response->send();
$kernel->terminate($request, $response);
Piotr Pasich @

REVERSE PROXY CACHE
class ResponseCache {
public function getResponseWithCache($html, $cacheTime=1)
{
$response = new Response($html);
$response->setMaxAge($cacheTime);
$response->setSharedMaxAge($cacheTime);
$date = new DateTime();
$date->modify("+$cacheTime seconds");
$response->setExpires($date);
return $response;
}
}
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RENDER
{% render url('latest_news', { 'max': 5 }) with {}, {'standalone': true} %}
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ROUTING
namespace XsolveLegacyBundleService;
class LegacyRouter
{
/** @var array Legacy routes configuration */
protected $config;
public function __construct(Router $router)
{
include __DIR__.'/../../../../legacy/application/config/urls.php';
$this->config = $config;
$this->router = $router;
$this->locale = $this->router->getContext()->getParameter('_locale');
}
// (..)
}
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KONFIGURACJA
class LegacyConfiguration
{
protected $configuration;
public function __construct($configuration)
{
$this->configuration = $configuration;
}
public function onKernelRequest(GetResponseEvent $event)
{
global $legacyConfig;
$legacyConfig = $this->configuration;
}
}
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KONFIGURACJA
global $legacyConfig;
$config['default'] = $legacyConfig['database']['default'];
$config['import'] = $legacyConfig['database']['import'];
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SESSION
Gdzie jest problem?
_s2_(...)
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SESSION
class RequestListener {
public function onKernelRequest(GetResponseEvent $event) {
$bags = array(
'total_hits',
'_kf_flash_',
'user_agent',
'last_activity',
'search.criteria',
'category.name',
'auth_user'
);
foreach ($bags as $namespace) {
$bag = new AttributeBag($namespace, '.');
$bag->setName($namespace);
$this->session->registerBag($bag);
}
}
}
Piotr Pasich @

SESSION
namespace XsolveLegacyBundleSession;
use SymfonyComponentHttpFoundationSessionAttributeAttributeBagInterface;
use SymfonyComponentHttpFoundationSessionSessionBagInterface;
use XsolveLegacyBundleSessionScalarBagInterface;
/**
* This class provides scalar storage of session attributes using
* a name spacing character in the key.
*
* @author Piotr Pasich <piotr.pasich@xsolve.pl>
*/
class ScalarBag implements ScalarBagInterface, SessionBagInterface
{
// (...)
}
Piotr Pasich @

REQUEST LISTENER
<?xml version="1.0" ?>
<container xmlns="http://symfony.com/schema/dic/services"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://symfony.com/schema/dic/services http://symfony.
com/schema/dic/services/services-1.0.xsd">
<services>
<service id="xsolve.legacy.listener.request" class="XsolveLegacyBundleRequestListener"
>
<tag name="kernel.event_listener" event="kernel.request" method="onKernelRequest"/>
<argument type="service" id="session" />
</service>
</services>
</container>
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NIE DZIAŁA!
DLACZEGO?
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BO KOHANA!
class Session_Core {
// (...)
public function create($vars = NULL)
{
$this->destroy();
// (...)
}
}
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TERAZ DZIAŁA
// (...)
{
//$this->destroy();
// (...)
}
}
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TERAZ NIE DZIAŁA
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TERAZ DZIAŁA
// (...)
{
// Destroy any current sessions
self::$createCall = self::$createCall+1;
if (self::$createCall > 10){
$_SESSION = array();
}
// this->destroy();
// (...)
}
}
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BAZA DANYCH
ponad 100 tabel = 100 encji
brak odpowiednich relacji
brak pełnej zgodności z wymogami Doctrine 2
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BAZA DANYCH
app/console doctrine:mapping:import XsolveLegacyBundle annotation
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KONFLIKTY I BŁĘDY
naprawiamy ręcznie :(
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PRZEPISUJEMY
/**
* @Route("/{categoryName}.html")
*/
public function indexAction($categoryName)
{
$criterias = array( 'category' => $categoryName );
$offers = $this->get('legacy.offers')->getRandomOffers($criterias);
$view = $this->renderView('XsolveOfferBundle:Default:index.html.twig', array(
'offers' => $offers
));
return $this->get('legacy.response.cache')->getResponseWithCache($view, 2);
}
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DZIĘKUJĘ ZA UWAGĘ
Piotr Pasich
piotr.pasich@xsolve.pl
www.xsolve.pl

Legacy applications - 4Developes konferencja, Piotr Pasich

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