From Legacy to Symfony @ SymfonyLive London 2017

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From Legacy to Symfony Sebastian Grodzicki

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– Sebastian Grodzicki How can one use Symfony 4.0 and PHP 7.2  while working with a legacy application?

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Sebastian Grodzicki • CTO at SHOWROOM • former dev & CTO at GoldenLine • SensioLabs Certiﬁed  Symfony Developer (Expert) • PHP developer for 15+ years

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• business social network founded in 2005 • in-house framework (“Xplod”) • LAMP stack • monolith

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GoldenLine

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• developer on-boarding took almost  6 months • no documentation • no tests • complexity

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– Joel Spolsky, CEO of Stack Overﬂow The single worst strategic mistake that any software company can make:  rewrite the code from scratch.

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• using Composer • using #1 Symfony component (Console) • decided to migrate to Symfony 2.1 2012

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Proof of Concept

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@LegacyIfRoleNot

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Routing self::$map = [ [ 'uri' => '^/oauth/authorize/?(.+)?$', 'action' => 'oauth/authorize', ], [ 'uri' => '^/m$', 'action' => 'mobile/touch', ], // 746 more like this ];

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Routing public function convert(array $rule) { $route = new Route('/{uri}'); $route->setRequirement('uri', $this->getRequirement($rule['uri'])); return $route; }

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Routing private function addRoute( RouteCollection $collection, array $rule, $controller = 'legacy.web_dispatching_controller:dispatchAction' ) { $name = sprintf( '__legacy_route_%s_%s_%s', (isset($rule['requireSsl']) ? strtolower($rule['requireSsl']) : 1), (isset($rule['method']) ? strtolower($rule['method']) : ''), md5($rule['uri']) ); $route = $this->converter->convert($rule); $route->setDefault('_controller', $controller); $collection->add($name, $route); }

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@LegacyIfRoleNot class AutocompleterController extends Controller { const DEFAULT_LIMIT = 15; /** * @LegacyIfRoleNot("ROLE_SYMFONY") * * @param Request $request * @throws AccessDeniedException * @return array */ public function getAction(Request $request) { $this->denyAccessUnlessGranted('ROLE_USER'); $query = $request->query->get('query'); $limit = $request->query->get('limit') ?: self::DEFAULT_LIMIT;

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Feature ﬂags

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Boostrap

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Internet Explorer 6

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@LegacyIfOldBrowser

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@LegacyIfOldBrowser class AuthenticatedController extends Controller { /** * @LegacyIfRoleNot({"IS_ANONYMOUS","ROLE_SYMFONY"}) * @LegacyIfOldBrowser */ public function indexAction(Request $request) { $this->denyAccessUnlessGranted('IS_AUTHENTICATED_ANONYMOUSLY'); /** @var $user User */ $user = $this->getUser(); if (!$user) { return $this->forward('HomepageBundle:Anonymous:index'); }

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GET vs POST GET /foobar

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GET vs POST POST /foobar

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CSRF

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CSRF public function setDefaultOptions(OptionsResolverInterface $resolver) { $resolver->setDefaults( [ 'csrf_field_name' => 'csrf', 'csrf_provider' => $this->csrfProvider, ] ); }

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GoldenLine • developer on-boarding took almost 6 months • no documentation • no tests • complexity

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Best Social Website Best Symfony Website

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SHOWROOM

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• online fashion marketplace founded in 2012 • built on Slim micro framework & Phalcon • API-centric

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• locked on Phalcon 2 & PHP 5.6 • no documentation • no tests • frustration

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• API v2 based on Symfony 3 • store front v2 (Symfony 3) • SHOWROOM SDK for PHP 2016

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PSQL 5432 PHP 5.6 9056 NGINX  80/443 Varnish 6081 NGINX 8080 • SSL Termination • Access logs • Redirect HTTP to HTTPS • HTTP Cache • Load balancer • Edge Side Includes (ESI) • PHP-FPM via FastCGI • Virtual Hosts • Access logs • PHP-FPM • PHP 5.6 Elasticsearch  9200 RabbitMQ  5672 Redis 6379

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PSQL 5432 PHP 5.6 9056 Varnish 6081 NGINX 8080 • SSL Termination • Access logs • Redirect HTTP to HTTPS • HTTP Cache • Load balancer • Edge Side Includes (ESI) • PHP-FPM via FastCGI • Virtual Hosts • Access logs • PHP-FPM • PHP 5.6 • PHP 7.1 Elasticsearch  9200 RabbitMQ  5672 Redis 6379 PHP 7.1 9071 NGINX 8081 NGINX  80/443

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Varnish

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Varnish backend app1a { .host = "10.0.0.1"; .port = "8080"; } backend app1b { .host = "10.0.0.2"; .port = "8080"; } backend app1c { .host = "10.0.0.3"; .port = "8080"; } backend app2a { .host = "10.0.0.1"; .port = "8081"; } backend app2b { .host = "10.0.0.2"; .port = "8081"; } backend app2c { .host = "10.0.0.3"; .port = “8081"; }

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Varnish sub vcl_init { new v1 = directors.round_robin(); v1.add_backend(app1a); v1.add_backend(app1b); v1.add_backend(app1c); new v2 = directors.round_robin(); v2.add_backend(app2a); v2.add_backend(app2b); v2.add_backend(app2c); }

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Nginx server { listen 8080; server_name api.shwrm.net; root /home/api_v1/public; location / { try_files $uri /index.php$is_args$args; } location ~ ^/index\.php(/|$) { fastcgi_pass 127.0.0.1:9056; include fastcgi_params; internal; } }

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Nginx server { listen 8081; server_name api.shwrm.net; root /home/api_v2/web; location / { try_files $uri /app.php$is_args$args; } location ~ ^/app\.php(/|$) { fastcgi_pass 127.0.0.1:9071; include fastcgi_params; internal; } }

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Varnish sub vcl_recv { if (req.http.Accept == "application/vnd.showroom.v2+json") { set req.backend_hint = v2.backend(); } else { set req.backend_hint = v1.backend(); } }

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sub vcl_recv { if ( req.url ~ "^/_(wdt|profiler|error|docs)/" || req.url ~ "^/assets/" || req.url ~ "^/orders/[0-9]+/refund" ) { set req.backend_hint = v2.backend(); } else { set req.backend_hint = v1.backend(); } } Varnish

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PostgreSQL

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PSQL 5432 Varnish 6081 NGINX 8080 Elasticsearch  9200 RabbitMQ  5672 Redis 6379 PHP 7.1 9071 NGINX 8080 PHP 5.6 9056 NGINX  80/443

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PostgreSQL Table View

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ESI

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Microservices Core API Shipping API HTTP

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Microservices Core API Analytics

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• locked on Phalcon 2 & PHP 5.6 • no documentation • no tests • frustration