From Legacy to Symfony @ SymfonyCon Cluj 2017

How can one use Symfony 4.0 and PHP 7.2 while working with a legacy application? Starting new projects on latest technology is a no-brainer but how often are you in this position? Most of the time it feels like you're stuck with what you have.

In this talk I'll share my experience migrating a legacy monolith from 2007 (powering a high traffic social network) and an API-centric web application (running an e-commerce marketplace) to Symfony.

Although the talk will be largely technical I'll also share some insights on ROI, non-technical benefits and pitching the idea to your boss.

Transcript

1. From Legacy to Symfony Sebastian Grodzicki !@sebgrodzicki
2. How can one use Symfony 4.0 and PHP 7.2
 while working with a legacy application?
3. phpinfo() Sebastian Grodzicki
 • CTO at SHOWROOM • former dev & CTO at GoldenLine • SensioLabs Certified
 Symfony Developer (Expert) • PHP developer for 15+ years !@sebgrodzicki
4. GoldenLine • business social network founded in 2005 • in-house framework (“Xplod”) • LAMP stack • monolith
6. GoldenLine Developer on-boarding
 took almost 6 months
7. GoldenLine No documentation
8. GoldenLine No tests
9. GoldenLine Complexity
10. “The single worst strategic mistake that any software company can make: rewrite the code from scratch.”
11. GoldenLine @ 2012 Composer
12. GoldenLine @ 2012 #1 Symfony component
 Console
13. GoldenLine @ 2012 Symfony 2.1
14. Proof of Concept
15. @LegacyIfRoleNot
16. Routing self::$map = [ [ 'uri' => '^/oauth/authorize/?(.+)?$', 'action' => 'oauth/authorize', ], [ 'uri' => '^/m$', 'action' => 'mobile/touch', ], // 746 more like this ];
17. Routing public function convert(array $rule) { $route = new Route('/{uri}'); $route->setRequirement('uri', $this->getRequirement($rule['uri'])); return $route; }
18. 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); }
19. @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;
20. Feature flags
21. Boostrap
22. Internet Explorer 6
23. @LegacyIfOldBrowser
24. @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 $this->forward('HomepageBundle:Anonymous:index'); }
25. GET vs POST GET /foobar
26. GET vs POST POST /foobar
27. CSRF <?php namespace GoldenLine\LegacyBundle\Form\Extension\Csrf\CsrfProvider; use GoldenLine\UserBundle\Model\User; use Symfony\Component\Form\Extension\Csrf\CsrfProvider\CsrfProviderInterface; class SecretCsrfProvider implements CsrfProviderInterface { /** * @inheritdoc */ public function generateCsrfToken($intention) {
28. CSRF public function setDefaultOptions(OptionsResolverInterface $resolver) { $resolver->setDefaults( [ 'csrf_field_name' => 'csrf', 'csrf_provider' => $this->csrfProvider, ] ); }
29. GoldenLine Developer on-boarding took almost 6 months
30. GoldenLine No documentation
31. GoldenLine No tests
32. GoldenLine Complexity
33. Symfony Awards 2013 Best Social Website
34. Symfony Awards 2013 Best Symfony Website
35. SHOWROOM
36. SHOWROOM • online fashion marketplace founded in 2012 • built on Slim micro framework & Phalcon • API-centric
37. SHOWROOM Locked on
 Phalcon 2 & PHP 5.6
38. No documentation SHOWROOM
39. No tests SHOWROOM
40. Frustration SHOWROOM
41. • API v2 based on Symfony 3 • store front v2 (Symfony 3) • SHOWROOM SDK for PHP SHOWROOM @ 2016
42. 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
43. 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 • PHP 7.1 Elasticsearch
 9200 RabbitMQ
 5672 Redis 6379 NGINX 8081 PHP 7.1 9071
44. Varnish
45. 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"; }
46. 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); }
47. 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; } }
48. 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; } } Nginx
49. 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(); } }
50. 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
51. PostgreSQL
52. PSQL 5432 PHP 5.6 9056 NGINX
 80/443 Varnish 6081 NGINX 8080 Elasticsearch
 9200 RabbitMQ
 5672 Redis 6379 NGINX 8081 PHP 7.1 9071
53. PostgreSQL Table View
54. ESI ESI
55. Microservices HTTP Core API Shipping API
56. Microservices Core API Analytics
57. SHOWROOM Locked on
 Phalcon 2 & PHP 5.6
58. No documentation SHOWROOM
59. No tests SHOWROOM
60. Frustration SHOWROOM
61. Questions? https://joind.in/talk/ddace
62. Thank you! https://joind.in/talk/ddace