Setting up Redis/Resque with Rails 3 on Local and Heroku

gistfile1.md

Setting Up Redis/Resque with Rails 3 on Local and Heroku

Refs

• Redis
• Resque
• Railscast: Resque

Add the gem

In your Gemfile

gem 'resque', :require => 'resque/server'

Run bundle

bundle install

Create a Connection Class

create lib/redis_connection.rb

class RedisConnection

  def self.close
    connection.quit
  end

  def self.connection
    @connection ||= new_connection
  end

  private

  def self.new_connection
    Redis.new(:host => Settings.redis.host,
              :port => Settings.redis.port,
              :password => Settings.redis.password,
              :thread_safe => true)
  end
end

Note: These settings are referenced from the settings.yml file via SettingsLogic gem

Set up Heroku Environment Variables

On the terminal

heroku config:set REDIS_HOST=ray.redistogo.com --remote stage
heroku config:set REDIS_PORT=9286 --remote stage
heroku config:set REDIS_PASSWORD=xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx --remote stage

Set up Settings variables in settings.yml

staging:
<<: *defaults
  redis:
  host: <%= ENV["REDIS_HOST"] %>
  port: <%= ENV["REDIS_PORT"] %>
  password: <%= ENV["REDIS_PASSWORD"] %>

Autoload the lib directory

Add/edit this line in config/application.rb

config.autoload_paths += %W(#{config.root}/lib #{config.root}/lib/**/*)

Create a Rake Task for Resque

create a file of lib/tasks/resque.rake

require "resque/tasks"

task "resque:setup" => :environment do
  Resque.before_fork = Proc.new { ActiveRecord::Base.establish_connection }
end

Create an initializer file

create config/initializers/resque.rb

Resque.redis = RedisConnection.connection

Create an external system to host queue

create account at RedisToGo https://redistogo.com

get instance info at https://redistogo.com/instances

• requirepass xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
• port 9286
• host ray.redistogo.com

Create Procfiles for Local and Hosted Envs

create Procfile.local for testing, development on Local

redis: redis-server
worker: env QUEUE=* bundle exec rake environment resque:work

create Procfile for staging, production on Heroku

web: thin start -p $PORT
worker: env QUEUE=* bundle exec rake resque:work

Mount Resque on Rails 3 Routes

Add line to config/routes.rb

mount Resque::Server, :at => "/resque"

Turn on Heroku Worker

On the terminal

heroku ps:scale worker=1 --remote stage

Best example I've seen online. Thanks!

Any differences for Rails 4?

Great tutorial! One suggestion to simplify, if you are not using the SettingsLogic gem and using Redis Cloud self.new_connection can be set up as:

host = URI.parse(ENV["REDISCLOUD_URL"]).try(:host)
port = URI.parse(ENV["REDISCLOUD_URL"]).try(:port)
password = URI.parse(ENV["REDISCLOUD_URL"]).try(:password)
Redis.new(:host => host, :port => port, :password => password)