GitLab, Journey In Time

Small retrospective of GitLab development and some conclusions why it still successful. The talk was given during Rails Girls Tamale Ghana event on May 22 2021.

Transcript

1. GITLAB, JOURNEY IN TIME HOW GITLAB CHANGED OVER 10 YEARS AND WHAT WE CAN LEARN FROM IT Tetiana Chupryna Rails Girls Tamale Ghana 22 May 2021
2. ABOUT ME Tetiana Chupryna
3. ABOUT ME Tetiana Chupryna Secure::Composition Analysis
4. ABOUT ME Tetiana Chupryna Secure::Composition Analysis Kharkiv, Ukraine
5. ABOUT ME Tetiana Chupryna Secure::Composition Analysis Kharkiv, Ukraine I love nature
6. ABOUT ME Tetiana Chupryna Secure::Composition Analysis Kharkiv, Ukraine I love nature My dog name is Darcy
7. ABOUT ME Tetiana Chupryna Secure::Composition Analysis Kharkiv, Ukraine I love nature My dog name is Darcy Ruby developer
8. I write in Ruby for 8+ years I work for GitLab for 2+ years
9. OVER 2 YEARS We grow from 1 team to whole department We have multiple teams in 2 product categories So far we developed a lot of cool features
10. LET’S TALK ABOUT CHANGES
11. OUR TIME MACHINE GIT Distributed version control system Helps people to collaborate on software Essential software development instrument
14. 2011 GITLAB Monolith Rails app Open source git-repository hosting service Alternative to GitHub that doesn’t have free private repos Team: 2+ people
15. 2021 GITLAB Monolith Rails app DevOps lifecycle tool, with open core Provides features not only for hosting but also for CI/CD, security, project management, code review, packaging and more. Team: 1330+ people and 311+ their pets in 68 countries
16. JOURNEY BEGINS
17. 9 OCTOBER 2011
18. 09/10/2011 FIRST COMMIT `init commit` Rails 3.1, sqlite Simple rails structure MVC App folder - 168 f iles Frontend - haml, JQuery
20. 22/10/2011 FIRST RELEASE Versions 1.1.0 Since then all releases happens on 22th
21. NOVEMBER 2011
23. 22 DECEMBER 2011
24. 22/12/2011 VERSION 2.0 Merge Request concept is introduced MergeRequest model is 45 lines
25. class MergeRequest < ActiveRecord::Bas e belongs_to :projec t belongs_to :author, :class_name => "User " belongs_to :assignee, :class_name => "User " has_many :notes, :as => :noteable, :dependent => :destro y attr_protected :author, :author_id, :project, :project_i d validates_presence_of :project_i d validates_presence_of :assignee_i d validates_presence_of :author_i d validates_presence_of :source_branc h validates_presence_of :target_branc h delegate :name , :email , :to => :author , :prefix => tru e delegate :name , :email , :to => :assignee , :prefix => tru e validates :title , :presence => true , :length => { :within => 0..255 } scope :opened, where(:closed => false ) scope :closed, where(:closed => true ) scope :assigned, lambda { |u| where(:assignee_id => u.id) } def new ? today? && created_at == updated_a t en d def diff s commits = project.repo.commits_between(target_branch, source_branch).map {|c| Commit.new(c) } diffs = project.repo.diff(commits.first.prev_commit.id, commits.last.id) rescue [ ] en d def last_commi t project.commit(source_branch ) en d en d
26. YEAR 2013
28. APPLICATION GROWING Re f ined project structure Workers - for background jobs Services - tasks extracted from models that violates single responsibility principle Contexts - extraction of logic from controllers (outdated) Observers - extraction of callback logic (outdated)
29. 22/08/2013 VERSION 6.0 MergeRequest model - 282 lines app folder - 862 f iles
30. YEAR 2015 MergeRequest model - 473 lines app folder - 1577 f iles
31. YEAR 2016 MergeRequest model - 874 lines app folder - 2222 f iles Policies - check permissions Finders - heavy database searches Validators - model validations
33. YEAR 2021
34. 22/05/2021 VERSION 13.12 Rails monolith running on Rails 6.0.3.6 Some operations are extracted to separate Go services New entities: enums, presenters, replicators, serialisers, uploads
35. 13.12 NOW Code separated by enterprise and core versions All entities are namespace MergeRequest model - 1959 lines app folder - 13183 f iles
36. NOW jQuery -> Vue.JS GraphQL Grape sqlite -> PostgreSQL 13.12
38. WHAT WE CAN LEARN
39. RAILS APPROACH
40. ENABLE COLLABORATION
41. STRIVE FOR RESULTS
42. ITERATE
43. BE EFFICIENT
44. ALL - REMOTE
45. DOG - FOODING GitLab is hosted on GitLab.com We scan it with our security features We use CI/CD We create issues on GitLab.com We store our containers with our features
46. YOU JUST NEED TO START
47. PROJECTS ARE CREATED BY PEOPLE
48. EVERYONE CAN CONTRIBUTE
49. HAPPY HACKING!