Symfony @ BlaBlaCar

Talk given with @odolbeau at the Symfony Con 2015. We present some of the use-cases we encountered with symfony at BlaBlaCar.

2. @odolbeau Web Architect Olivier Dolbeau
3. @Genes0r Web Developer Benjamin De Bernardi
4. Leader ride-sharing service. Our goal is to become the 1st travel platform. 30€ 30€ 30€ 30€
6. Unfortunately, this isn’t our ugliest slide! Sorry.
12. Attract new people
13. Let the journey begins!
14. Started August 18th, 2011
15. From 3 to 75 contributors
16. Symfony Upgrades Started with SF2 2.0 Upgrade as soon as we can Remove deprecated code Follow best practices 2.0 → 2.7
17. Failure is not the end, it’s the beginning.
18. DO! DON’T!
19. Should we wear bermudas?
21. DO! Bermudas will rule the world!
22. DO! DON’T!
23. Pimp your kernel.
24. Use case Deal with white labeled products (and “medias”).
25. Expected Deal with ∞ combination of brands / medias. Different configuration / views / ... Keep (a lot of) small containers.
26. Before After Branding Media Environment Debug?
27. Pimp your kernel?
28. DON’T!
29. • Not that small containers • You need to add code in app_prod. php to choose the right kernel to boot. • You can’t easily use your application as a consumer. DON’T!
30. DO! DON’T!
31. It’s not a troll.
32. Code fast!
33. Code well?
35. Queries from the view! Hard to control cache strategy No integrity check.
36. What else? + Quick to bootstrap a new project + Quick to code a small project - Hard to respect MVC - Hard to deal with cache - Hard to deal with integrity problems in DB - Not made to decouple code (relations). - Not made to scale.
37. DO? DON’T? Not an easy choice.
38. DO! DON’T!
39. Event Dispatcher a little? a lot? everywhere?
40. ~100 listeners
41. Check eventName & event interface Dispatch the event in the application. Decorated EventDispatcher. Publish to RabbitMQ
42. 129 workers. mail sms publication push indexation image resizing alerts profile completion We love workers!
43. + Perfect to decouple code inside the app. + Small listeners, easy to understand, to test. + Easy to dispatch events outside application. + Scalable! - Sometimes, hard to understand what happen. - Need tools / rules to keep a common logic. - Try to limit entities usage. ;) What else?
44. DO! But do it carefully!
45. DO! DON’T!
46. Put everything in the same place?
47. It’s called V3
48. 29 582 Commits There are “only” 15 506 commits for symfony/symfony There are “only” 10 228 commits for joyent/node There are “only” 9 266 commits for twbs/bootstrap There are 44 809 commits for rails/rails (but it’s ruby… #troll)
49. 406 187 NLOC There are “only” 268 041 NLOC for symfony/symfony
50. Size doesn’t matter!
51. IT’S TOO BIG IT’S TOO BIG IT’S TOO BIG
52. ~ 30 minutes to run all the unit/functional tests
53. ~ 30 minutes to deploy the application
54. What else ? • Long learning curve • Too many side effects • Time consuming • Big maintenance • Spaghetti code
55. DO! Then DON’T! You’ll know when you’ll need it. :)
56. DO! DON’T!
57. Put business logic inside Symfony?
58. This is our application. I want to move this logic.
59. Users, ratings, notifications, ridemap... MICRO-SERVICES
60. MICRO-SERVICES
61. MICRO-SERVICES
62. The gateway
63. The gateway ❖ It’s code ❖ It uses DDD ❖ Everyone love it ❖ It’s very well organized ❖ There’s a lot of (very) strict rules ❖ It separates business logic & data access ❖ It’s a vendor ! Easy to use everywhere
64. How to: Get a rating
65. Business
66. A Web Service Like Conversation Request message Response message Client Server
67. Data
68. Data • Cache ready • Backend agnostic
69. Data • Cache ready • Backend agnostic Encapsulation !
70. Data RedisStorage is able to contain a DBALStorage Encapsulation !
71. Data RedisStorage DBALRatingStorage Fallback on DBALRatingStorage
72. The gateway ❖ Flexible ❖ Easy to test ❖ Deployed when needed ❖ Used for all new projects
73. V3 Previous ecosystem
74. Gateway V3 W W W W W C W C C C W Current ecosystem W • 90 workers • 40 commands
75. V3 W W W W W C W C C C W Future ecosystem? W Gateway Gateway Gateway
76. V3 W W W W W C W C C C W Future ecosystem? W B B B B B B D D D
77. Put business logic inside Symfony?
78. DON’T!
79. I’ve found a use case!
80. NO YOU DON’T!
81. DO! DON’T! + Use feature flags / on the fly toggling. + Make code reviews. + Keep a clean codebase. + Use encapsulation! <3 + Be generic + Promote reusability - Onboard people too quickly. - Depend too much on the framework - Let your container get too big. - Try not to extend the framework.
82. Symfony2 was a good choice. Even if we made lot of wrong choices. We’ll decouple!
83. Keep growing! Simpler with several small applications?
84. • Fail, learn, succeed! • Microservices FTW! • Be worldwide! • Bermudas are great tools to build performant websites Benjamin De Bernardi @Genes0r Olivier Dolbeau @odolbeau We’re hiring! In Paris & Warsaw! http://blbl.cr/dreamjobs