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Ruby on RailsAdvent Calendar 2012

Rails3.2.8 + Resque + Heroku(Redis To Go)

Last updated at 2012-12-26Posted at 2012-09-20

参考リンク

Redisインストール

ターミナル

brew install redis
----------
==> Downloading http://redis.googlecode.com/files/redis-2.4.15.tar.gz
######################################################################## 100.0%
==> make -C /private/tmp/homebrew-redis-2.4.15-bg22/redis-2.4.15/src CC=/usr/bin/gcc-4.2
==> Caveats
If this is your first install, automatically load on login with:
    mkdir -p ~/Library/LaunchAgents
    cp /usr/local/Cellar/redis/2.4.15/homebrew.mxcl.redis.plist ~/Library/LaunchAgents/
    launchctl load -w ~/Library/LaunchAgents/homebrew.mxcl.redis.plist

If this is an upgrade and you already have the homebrew.mxcl.redis.plist loaded:
    launchctl unload -w ~/Library/LaunchAgents/homebrew.mxcl.redis.plist
    cp /usr/local/Cellar/redis/2.4.15/homebrew.mxcl.redis.plist ~/Library/LaunchAgents/
    launchctl load -w ~/Library/LaunchAgents/homebrew.mxcl.redis.plist

  To start redis manually:
    redis-server /usr/local/etc/redis.conf

  To access the server:
    redis-cli
==> Summary
/usr/local/Cellar/redis/2.4.15: 9 files, 576K, built in 19 seconds
----------

Redisサーバ起動

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redis-server /usr/local/etc/redis.conf
----------
[1648] 20 Sep 12:14:06 * Server started, Redis version 2.4.15
[1648] 20 Sep 12:14:06 * The server is now ready to accept connections on port 6379
[1648] 20 Sep 12:14:06 - 0 clients connected (0 slaves), 922304 bytes in use
----------

Resqueインストール

Gemfile

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

ターミナル

bundle install

Redis／Resque設定作成

vi config/initializers/resque.rb

config/initializers/resque.rb

Resque.redis = 'localhost:6379'

Rakeタスク追加

vi lib/tasks/resque.rake

lib/tasks/resque.rake

require "resque/tasks"

task "resque:setup" => :environment

キュー追加

※Controller、Modelなど

Resque.enqueue( SnippetHighlighter, @snippet.id )

worker作成

app/workers/snippet_highlighter.rb

class SnippetHighlighter
  @queue = :snippets_queue

  def self.perform(snippet_id)
    snippet = Snippet.find(snippet_id)
    uri = URI.parse('http://pygments.appspot.com/')
    request = Net::HTTP.post_form(uri, {'lang' => ↵
      snippet.language, 'code' => snippet.plain_code})
    snippet.update_attribute(:highlighted_code, request.body)
  end
end

Rakeタスク実行

※起動しておくと発生したキューを順次実行していく(「QUEUE=queue_name」でキャッチするキューを指定する、全ての場合は「QUEUE='*'」)

ターミナル

bundle exec rake resque:work QUEUE=snippets_queue

ターミナル

bundle exec rake resque:work QUEUE='*'

ジョブ管理画面起動

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resque-web

ResqueのWebインターフェイスをRailsアプリケーションへ組み込む

config/routes.rb

MyApp::Application.routes.draw do
  mount Resque::Server, at: "/resque"

  # 〜
end

http://localhost:3000/resque

Devise認証用

config/routes.rb

MyApp::Application.routes.draw do
  authenticate :admin do
    mount Resque::Server, at: "/resque"
  end
end

BASIC認証用

config/initializers/resque_auth.rb

Resque::Server.use(Rack::Auth::Basic) do |user, password|
  password == "secret"
end

Heroku - Redis To Go

Redis To Goアドオン追加

ターミナル

heroku addons:add redistogo:nano

Redis To Go用設定追加

Redis To Goアドレス確認

ターミナル

heroku config | grep "REDISTOGO_URL"

config/initializers/resque.rb

if Rails.env.development?
  Resque.redis = 'localhost:6379'
else
  Resque.redis = ENV['REDISTOGO_URL']
end

Heroku上Rakeタスク実行

ターミナル

heroku run bundle exec rake resque:work QUEUE='*'

「PG::Error: SSL error: decryption failed or bad record mac」エラーが発生した場合

lib/tasks/resque.rake

require "resque/tasks"

task "resque:setup" => :environment do
  ENV['QUEUE'] = '*'
  Resque.after_fork = Proc.new { ActiveRecord::Base.establish_connection }
end

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