Monorepo in real life

Monolithic application

A single unified software application which is self-contained and independent from other applications

Monolithic

Simple

Modular application

An application composed of loosely coupled, functional units called modules

https://github.com/Sylius/Sylius

Components or Bundles

MonoRepo

A monorepo is a single repository containing multiple distinct projects, with well-defined relationships

MonoRepo

Simple

Code colocation

Maybe monorepo

Code colocation

Maybe maybe monorepo

MonoRepo library

with subtree split

Monorepo or monolithic or "code colocation" ?

Maybe all at once!

If we have multiple distinct projects, what is the monorepo alternative ? 

Polyrepo

https://monorepo.tools/#polyrepo-concept

Why  MonoRepo?

Backward resilient

Better decommissioning

Lesser PullRequest

Better Code Review

Implicit CI

Better productivity

Avoid switching repo

Better collaboration between Teams

We can fix bugs in all projects

Less Managment

Everything is centralized

Dependency managment

Code more reusable

Access Control

Better Continus Integration

Visibility

Cross Team Contribution

Single source of truth

Consistency

Shared Timeline

Atomic commits

Unified CI/CD

Unified build process

Unified deploy process

Refactoring easier

Sharing coding standard

Synchronized release

Sharing dependencies

To list a pro and cons of monorepo strategy i recommand:

https://monorepo.tools/#why-a-monorepo

My top 5 reasons

  • Better Code Review
  • Lesser PullRequest
  • Single source of truth
  • Less Managment
  • Code more reusable

If I update project A, do i need to wait the whole CI for all projects ?

It depends - sometime you want it, sometime not. But know you have the opportunity to choose. 

# .gitlab-ci.yml
backend_test:
  stage: test
  script: 
    - make functional-test-backend
    - make functional-test-front
  rules:
      changes:
        - backend/*

front_test:
  stage: test
  script: 
    - make functional-test-front
  rules:
      changes:
        - front-react/*

Gitlab exemple with "changes" options

Feedback MicroService

  • We have a 15 old years ecommerce project
  • We have to modernize it
  • We have to keep business going
  • We want to use Service Oriented Architecture

Context

From SymfonyCon 2022

Ecommerce

Ecommerce

Stock

Order

Before

After

From SymfonyCon 2022

Text

Tooling

#1 CODEOWNERS

#1 CODEOWNERS

#2 Deptrac

paths:
    - ./ecommerce/src
    - ./stock/src
    - ./order/src

layers:
    - name: Ecommerce
      collectors:
          - type: className
            regex: .*App\\Ecommerce\\.*

    - name: Stock
      collectors:
          - type: className
            regex: .*App\\Stock\\.*

    - name: Order
      collectors:
          - type: className
            regex: .*App\\Order\\.*

#2 Deptrac

layers:
    - name: Ecommerce
      collectors:
          - type: className
            regex: .*App\\Ecommerce\\.*

    - name: Stock
      collectors:
          - type: className
            regex: .*App\\Stock\\.*

    - name: PaymentBundle
      collectors:
          - type: className
            regex: .*App\\PaymentBundle\\.*

ruleset:
    Ecommerce:
        - PaymentBundle
    Stock:
        - PaymentBundle

Conclusion for PHP context

  • 🤹 Setting up monorepo require skills (CI/CD/Tools)
  • ⏳ Setting up monorepo doesn't take long (CI/CD) and don't require a lot of tooling
  • 🕵️‍♂️ The real only downside is boundary issue
  • 🧩 Can be temporary and progressively switch to polyrepo
  • 🚀 Will skyrocket development speed in almost any multi-project context

“With the right tools, anyone can unlock the power of monorepos”

from vercel

Bonus Git Clone

🌍 shallow clone a lightweight "git clone" without the whole git history

 

 

 

🚧 partial clone a feature to avoid to download everything

git clone --depth=1 https://github.com/Symfony/symfony
git clone --filter=blob:none https://github.com/org/proj

 

https://github.com/splitsh/lite 

# Git command
git subtree split --prefix=lib

# Fabpot tools
splitsh-lite --prefix=lib/

Bonus Git split

Code

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