Rails 3 asset pipeline deploy task with s3 and cloudfront support

assets.rake

namespace :assets do
  desc 'Precompile assets and upload to S3'
  task :sync => :environment do
    assets = build_asset_dir

    raise 'asset directory is empty: aborting' unless assets.size > 1

    invalid_files = build_assets assets
    delete_old_assets assets
    invalidate_files invalid_files unless invalid_files.empty?
  end

  private

  def aws
    @aws ||= Rails.application.config.aws.marshal_dump.deep_symbolize_keys[Rails.env.to_sym]
  end

  def bucket
    @bucket ||= fog.directories.get("#{aws[:bucket]}")
  end

  def fog
    @fog ||= Fog::Storage.new :provider => 'AWS', :aws_access_key_id => "#{aws[:access_key]}", :aws_secret_access_key => "#{aws[:secret]}", region: 'us-west-1'
  end

  def build_assets assets
    invalid_files = []

    assets.each do |file, etag|
      case etag
      when :directory
        puts "Directory - #{file}"
        bucket.files.create(key: file, public: true)
      when bucket.files.get(file).try(:etag)
        puts "Skipping - #{file} (identical)"
      else
        invalid_files << "/#{file}"
        puts "Uploading - #{file}"
        bucket.files.create(key: file, public: true, body: File.open("#{Rails.root}/public/#{file}"), cache_control: "max-age=#{6.month.to_i}, public", expires: "#{6.month.from_now.httpdate}")
      end
    end

    invalid_files
  end

  def build_asset_dir
    Dir.chdir("#{Rails.root}/public") do
      FileList['assets', 'assets/**/*'].inject({}) do |hash, path|
        if File.directory? path
          hash.update("#{path}/" => :directory)
        else
          hash.update(path => OpenSSL::Digest::MD5.hexdigest(File.read(path)))
        end
      end
    end
  end

  def delete_old_assets assets
    bucket.files.each do |file|
      unless assets.has_key? file.key
        puts "Removing #{file.key} (deleted asset)"
        file.destroy
      end
    end
  end

  def invalidate_files invalid_files
    cdn = Fog::CDN.new({
      :provider               => 'AWS',
      :aws_access_key_id      => "#{aws[:access_key]}",
      :aws_secret_access_key  => "#{aws[:secret]}"
    })

    request = cdn.post_invalidation("#{aws[:cloudfront_distribution]}", invalid_files)
    puts "Invalidation : #{request.body}"
  end

end

deploy.rake

namespace :heroku do
  desc "Deploy to Heroku"
  task :deploy do
    Rake::Task['assets:precompile'].clear
    Rake::Task["assets:upload"].invoke
    Rake::Task["heroku:push"].invoke
  end

  desc "Push master branch to heroku remote"
  task :push do
    puts "[Deploying] Heroku"
    `git push production master`
  end

end

gemfile

group :assets do
  gem 'yui-compressor'
  gem 'uglifier', '>= 1.0.3'
end

gem 'heroku'
gem 'fog'

output.txt

rake heroku:deploy
/Users/mdyer/.rvm/rubies/ruby-1.9.3-head/bin/ruby /Users/mdyer/.rvm/gems/ruby-1.9.3-head@global/bin/rake assets:clean:all RAILS_ENV=production RAILS_GROUPS=assets
rm -rf /Users/mdyer/Sites/v3/public/assets
/Users/mdyer/.rvm/rubies/ruby-1.9.3-head/bin/ruby /Users/mdyer/.rvm/gems/ruby-1.9.3-head@global/bin/rake assets:precompile:all RAILS_ENV=production RAILS_GROUPS=assets
Directory - downloads/
Skipping - downloads/resume.pdf (identical)
Directory - ui/
Directory - ui/fonts/
Directory - ui/fonts/depot/
Skipping - ui/fonts/depot/depotnewweb-bd.eot (identical)
Skipping - ui/fonts/depot/depotnewweb-bd.svg (identical)
Skipping - ui/fonts/depot/depotnewweb-lt.eot (identical)
Skipping - ui/fonts/depot/depotnewweb-lt.svg (identical)
Skipping - ui/fonts/depot/depotnewweb-md.eot (identical)
Skipping - ui/fonts/depot/depotnewweb-md.svg (identical)
Directory - ui/images/
Directory - ui/images/common/
Skipping - ui/images/common/background.png (identical)
Skipping - ui/images/common/favicon.png (identical)
Skipping - ui/images/common/logo.png (identical)
Skipping - ui/images/common/tile.png (identical)
Directory - ui/images/logos/
Skipping - ui/images/logos/boars.png (identical)
Skipping - ui/images/logos/cbs.png (identical)
Skipping - ui/images/logos/colonna.png (identical)
Skipping - ui/images/logos/cracked.png (identical)
Skipping - ui/images/logos/cuenotes.png (identical)
Skipping - ui/images/logos/dealer.png (identical)
Skipping - ui/images/logos/donfrancisco.png (identical)
Skipping - ui/images/logos/ehow.png (identical)
Skipping - ui/images/logos/gameon.png (identical)
Skipping - ui/images/logos/laane.png (identical)
Skipping - ui/images/logos/lexus.png (identical)
Skipping - ui/images/logos/momentfeed.png (identical)
Skipping - ui/images/logos/typef.png (identical)
Skipping - ui/images/logos/universal.png (identical)
Skipping - ui/images/logos/wendys.png (identical)
Directory - ui/images/tiles/
Skipping - ui/images/tiles/universal.png (identical)
No invalid files. Cloudfront invalidation not required.
[Deploying] Heroku
Counting objects: 19, done.
Delta compression using up to 2 threads.
Compressing objects: 100% (9/9), done.
Writing objects: 100% (10/10), 985 bytes, done.
Total 10 (delta 5), reused 0 (delta 0)

-----> Heroku receiving push
-----> Ruby/Rails app detected
-----> Using Ruby version: ruby-1.9.3
-----> Installing dependencies using Bundler version 1.2.0.rc
       Running: bundle install --without development:test --path vendor/bundle --binstubs bin/ --deployment
       Using rake (0.9.2.2)
       Using Platform (0.4.0)
       Using open4 (1.3.0)
       Using POpen4 (0.1.4)
       Using i18n (0.6.0)
       Using multi_json (1.3.6)
       Using activesupport (3.2.6)
       Using builder (3.0.0)
       Using activemodel (3.2.6)
       Using erubis (2.7.0)
       Using journey (1.0.4)
       Using rack (1.4.1)
       Using rack-cache (1.2)
       Using rack-test (0.6.1)
       Using hike (1.2.1)
       Using tilt (1.3.3)
       Using sprockets (2.1.3)
       Using actionpack (3.2.6)
       Using mime-types (1.19)
       Using polyglot (0.3.3)
       Using treetop (1.4.10)
       Using mail (2.4.4)
       Using actionmailer (3.2.6)
       Using active_attr (0.6.0)
       Using arel (3.0.2)
       Using tzinfo (0.3.33)
       Using activerecord (3.2.6)
       Using activeresource (3.2.6)
       Using addressable (2.2.8)
       Using daemons (1.1.8)
       Using dalli (2.1.0)
       Using eventmachine (0.12.10)
       Using excon (0.14.3)
       Using execjs (1.4.0)
       Using formatador (0.2.3)
       Using net-ssh (2.5.2)
       Using net-scp (1.0.4)
       Using nokogiri (1.5.5)
       Using ruby-hmac (0.4.0)
       Using fog (1.5.0)
       Using heroku-api (0.2.7)
       Using launchy (2.1.0)
       Using netrc (0.7.5)
       Using rest-client (1.6.7)
       Using rubyzip (0.9.9)
       Using heroku (2.28.10)
       Using json (1.7.4)
       Using rack-ssl (1.3.2)
       Using bundler (1.2.0.rc)
       Using rdoc (3.12)
       Using thor (0.15.4)
       Using railties (3.2.6)
       Using rails (3.2.6)
       Using sendgrid-rails (2.0.2)
       Using thin (1.4.1)
       Using uglifier (1.2.6)
       Using yui-compressor (0.9.6)
       Your bundle is complete! It was installed into ./vendor/bundle
       Cleaning up the bundler cache.
-----> Writing config/database.yml to read from DATABASE_URL
-----> Preparing app for Rails asset pipeline
       Running: rake assets:precompile
       Asset precompilation completed (37.55s)
-----> Rails plugin injection
       Injecting rails_log_stdout
       Injecting rails3_serve_static_assets
-----> Discovering process types
       Procfile declares types      -> web
       Default types for Ruby/Rails -> console, rake, worker
-----> Compiled slug size is 26.0MB
-----> Launching... done, v38
       http://n9nemedia.herokuapp.com deployed to Heroku

To git@heroku.com:n9nemedia.git
   e8df540..7812c9b  master -> master