taming monolithic monsters

@gavinjoyce

Taming Monolithic Monsters

Need help building something ambitious?

gavinjoyce@gmail.com

What’s the Problem?

What’s the Problem?● Rails apps don’t scale

What’s the Problem?● Rails apps don’t scale● Rails apps do scale:

What’s the Problem?● Rails apps don’t scale● Rails apps do scale:

○ Web servers are cheap

What’s the Problem?● Rails apps don’t scale● Rails apps do scale:

○ Web servers are cheap○ Engineers are expensive

What’s the Problem?● Rails apps don’t scale● Rails apps do scale:

○ Web servers are cheap○ Engineers are expensive○ Rails is optimised to save engineering time

What’s the Problem?● Rails apps don’t scale● Rails apps do scale:

○ Web servers are cheap○ Engineers are expensive○ Rails is optimised to save engineering time○ not the full story...

What’s the Problem?

● Large rails apps are hard to scale

In my experience:

What’s the Problem?

● Large rails apps are hard to scale:○ Team size

In my experience:

What’s the Problem?

● Large rails apps are hard to scale:○ Team size

■ code base complexity

In my experience:

What’s the Problem?

● Large rails apps are hard to scale:○ Team size

■ code base complexity■ brittleness due to tight coupling between

models

In my experience:

What’s the Problem?

● Large rails apps are hard to scale:○ Team size

■ code base complexity■ brittleness due to tight coupling between

models○ TDD feedback time

In my experience:

Mutations Gemgithub.com/cypriss/mutations

Mutations Gemgithub.com/cypriss/mutations

● Compose your business logic into commands that sanitize and validate input

Mutations Gemgithub.com/cypriss/mutations

● Compose your business logic into commands that sanitize and validate input

● Write safe, reusable, and maintainable code for Ruby and Rails apps

Defining a Mutations Command

Using a Mutations Command

demo - simple mutation command

Mutations in your app

Mutations in your app

● create an internal api

Mutations in your app

● create an internal api○ logically isolate key business logic

Mutations in RestPack

Mutations in RestPack

https://github.com/restpack

Mutations in RestPack

Mutations in RestPack

● Services are packaged as gems

Mutations in RestPack

● Services are packaged as gems:○ Commands

Mutations in RestPack

● Services are packaged as gems:○ Commands○ Serialisers

Mutations in RestPack

● Services are packaged as gems:○ Commands○ Serialisers○ Models

Mutations in RestPack

● Services are packaged as gems:○ Commands○ Serialisers○ Models○ Migrations

Mutations in RestPack

● Services are packaged as gems:○ Commands○ Serialisers○ Models○ Migrations○ Specs

Mutations in RestPack

● Services are packaged as gems:○ Commands○ Serialisers○ Models○ Migrations○ Specs

● Commands are the public interface

Mutations in RestPack

● Services are packaged as gems:○ Commands○ Serialisers○ Models○ Migrations○ Specs

● Commands are the public interface○ either Ruby or REST

RestPack Service Gem Anatomy

DB

RestPack Service Gem Anatomy

DB

RestPack Service Gem Anatomy

rake restpack:migrate

DB

models

RestPack Service Gem Anatomy

rake restpack:migrate

DB

models

RestPack Service Gem Anatomy

ActiveRecord models

rake restpack:migrate

DB

models

serialisers

RestPack Service Gem Anatomy

rake restpack:migrate

ActiveRecord models

DB

models

serialisers

RestPack Service Gem Anatomy

RestPack::Serializer gem

rake restpack:migrate

ActiveRecord models

DB

models

serialisers

commands

RestPack Service Gem Anatomy

rake restpack:migrate

ActiveRecord models

RestPack::Serializer gem

DB

models

serialisers

commands

RestPack Service Gem Anatomy

Mutations gem

rake restpack:migrate

ActiveRecord models

RestPack::Serializer gem

RestPack Service Gem Anatomy

code demo - restpack_activity_service

https://github.com/RestPack/restpack_activity_service

Using service gems from Rails

A first attempt….

DB

Activity Service Gem

actv.io rails app

DB

Activity Controller

Activity Service Gem

Host Ruby Application

actv.io rails app

DB

Activity Controller

Activity Clent Gem

Activity Service Gem

Host Ruby Application

actv.io rails app

Activity Model

DB

Activity Controller

Activity Clent Gem

Activity Service Gem

Host Ruby Application

actv.io rails app

Activity Model

Local Proxy

DB

Activity Controller

Activity Clent Gem

Activity Service Gem

Host Ruby Application

actv.io rails app

Activity Model

API ProxyLocal Proxy

DB

API

REST

Activity Controller

Activity Clent Gem

Activity Service Gem

Host Ruby Application

demo - Rails App

actv.io rails app

Activity Model

API ProxyLocal Proxy

DB

API

REST

Activity Controller

Activity Clent Gem

Activity Service Gem

Host Ruby Application

No need for Rails, the API is the server application

API

No need for Rails, the API is the server application

Android App

API

No need for Rails, the API is the server application

Android App iOS App

API

No need for Rails, the API is the server application

Web App Android App iOS App

API

No need for Rails, the API is the server application

Web App Android App iOS App ... App

API

... App... App

api.restpack.org

Core

DB

api.restpack.org

DB DB

Core Users

api.restpack.org

DB DB DB

Core Users Groups

api.restpack.org

DB DB DB DB

Core Users Groups Account

api.restpack.org

DB DB DB DB DB

Core Users Groups Account Email

Redis

Job Q

api.restpack.org

DB DB DB DB DB

Core Users Groups Account Email

Redis

Job Q

api.restpack.orgApply Security Policy

DB DB DB DB DB

Core Users Groups Account Email

Redis

Job Q

api.restpack.org

dashboard.restpack.org

Apply Security Policy

DB DB DB DB DB

Core Users Groups Account Email

Redis

Job Q

api.restpack.org

dashboard.restpack.org

Apply Security Policy

3rd Party Applications3rd Party Applications

3rd Party Applications3rd Party Applications

demo - Ember.js App

Redis

Job Q

api.restpack.org

dashboard.restpack.org

DB

1 Application, 1 DB

DB DB DB DB DB

Core Users Groups Account Email

Redis

Job Q

api.restpack.org

dashboard.restpack.org

API

Apply Security Policy

API APIAPI API

Many Applications, Many DBs

@gavinjoycegithub.com/RestPack

Questions?