mongodb + mailqueue + rails? Yes!

Rails Israel - 9th October 2013

Krzysztof Knapik

Tech Lead @ Lunar Logic
Ruby & JS consultant @ infakt

@knapo
github.com/knapo

sending email in rails apps - asynchronus or not?

it depends...

in our case: YES

but....how?

redis + resque_mailer?

NO.

• no VM & swapping, good for small and not very important data.
• requires extra implementation:
  

delayed_job?

NO.

• queue in SQL - possible.............
• requires extra implementation:
  

none of existing solutions offers emergency/backup/secondary delivery method in case failure

custom RabbitMQ solution?

• powerful, but over complicated

why mongo?

• swapping
• journaling
• atomic findAndModify operation
• performing and scalable

mongo_mailer

github.com/infakt/mongo_mailer

mongo_mailer components

• rails plugin providing ActionMailer delivery method, generators & capistrano recipies
• (standalone) worker with base and emergency delivery method

rails plugin

# Gemfile
gem 'mongo_mailer', require: 'mongo_mailer/rails'

# environment file
config.action_mailer.delivery_method :mongo_queue

$ bundle exec rails generate mongo_mailer		
#=> config/mongo_mailer.yml.example

# config/deploy.rb
require 'mongo_mailer/capistrano'


$ cap mongo_mailer:start|stop|restart

(standalone) worker

# rails app
$ bundle exec mongo_mailer start|stop|restart

# independent app
$ bundle exec worker start|stop|restart

base and emergency delivery methods

config/mongo_mailer.yml

base_delivery_method: smtp
base_delivery_settings:
  user_name: "username"
  password: "apikey"
  domain: "example.com"
  address: "smtp1.example.com"
  port: 587
  authentication: plain

emergency_delivery_method: smtp
emergency_delivery_settings:
user_name: "username"
  password: "apikey"
  domain: "example.com"
  address: "smtp2.example.com"
  port: 587
  authentication: plain

thank you!

slides:
http://knapo.github.io/rails-israel-2013-mongo-mailqueue-rails/