use qiniu to speed up your site asset file load time

deploy.rb

set :linked_files, %W{
                       ... config/app.god config/qrsync.json
                       config/application.yml
                     }

# you should remove bin from linked_dirs config
# https://github.com/capistrano/bundler/issues/45
set :linked_dirs, %w{config/unicorn log tmp/pids tmp/cache tmp/sockets vendor/bundle public/system}

namespace :deploy do
  desc 'cp assets/images to public/assets'
  after :restart, :cp_assets do
    on roles(:app), in: :sequence, wait: 5 do
      execute :cp, '-R', release_path.join('app/assets/images/*'), release_path.join('public/assets/')
    end
  end

  desc 'cp assets/images to public/assets'
  after :cp_assets, :auto_sync_cdn do
    on roles(:app), in: :sequence, wait: 5 do
      if fetch(:qiniu_cdn)
        invoke 'deploy:sync_assets_to_qiniu'
      else
        execute :echo, "Pls, enable qiniu_cdn flag within STAGE file first"
      end
    end
  end

  after :publishing, :restart

  desc 'upload setup_config for application'
  task :upload_config do
    on roles(:web), in: :sequence, wait: 5 do
      fetch(:linked_files).each do |file_path|
        unless test "[ -f #{shared_path}/#{file_path} ]"
          upload!("#{file_path}", "#{shared_path}/#{file_path}", via: :scp)
        end
      end
    end
  end

  desc 'sync assets file to qiniu'
  task :sync_assets_to_qiniu do
    on roles(:web), in: :sequence, wait: 5 do
      within current_path do
        SSHKit.config.command_map[:qrsync] = "#{release_path}/bin/qrsync"

        if test "[ -f #{shared_path}/config/qrsync.json ]"
          execute "qrsync", "#{shared_path}/config/qrsync.json"
        else
          execute :echo, "no qrsync config been detected."
        end
      end
    end
  end


end

development.rb

# config/deploy/development.rb
set :qiniu_cdn, true

production.rb

# config/deploy/evirontments/production.rb
Rails.application.configure do
  # config.action_controller.asset_host = "http://assets.example.com"
  if ENV["asset_host"]
    config.action_controller.asset_host = ENV["asset_host"]
  end
end

qiniu_cdn_rails.md

Qiniu CDN with Rails

Presentation

this post will intro how ikcrm try to use qiniu cdn speed site's asset file.

references:

• 镜像存储
• https://ruby-china.org/topics/14552
• http://kb.qiniu.com/how-to-use-image-storage-and-qrsync
• https://github.com/ruby-china/ruby-china/commit/d050f7f8b7441fbd88671e0008205f4ccffca8b5
• capistrano/bundler#45

depend tools;

• capistrano
• figaro
• rails
• qrsync

step by step

• ensure figaro, capistrano within your Gemfile, and runed bundle install

• place qrsync execute file within rails_root_path/bin

• create qrsync file config file within rails_root_path/config create file rails_root_path/config/qrsync.json create file rails_root_path/config/qrsync.json.example

• install figaro by type figaro install ensure file rails_root_path/config/application.yml ensure file rails_root_path/config/application.yml.example

production:
  asset_host: "http://assets.example.com"

• update .gitignore file

config/qrsync.json
# Ignore application configuration
/config/application.yml

• update deploy.rb file to define task to sync asset file

• config qiniu_cdn flag within deploy stage file

• try to load asset_host from figrao

tips

• 多个项目使用相同的 七牛 bucket 做 cdn 是个坑, 因此最好 每个项目使用单独的 bucket,t 同时因为 rails 的资源文件 是有 签名串 的， 因此理论上同一个项目不同 stage 的 资源文件放在一个 bucket 里面是可行的

qrsync.json.example

{
    "src":          "/deploy_to_path/current/public/assets",
    "dest":         "qiniu:access_key=xxx=xxxxxx&bucket=vcl-ikcrm&key_prefix=assets/&threshold=1",
    "deletable":    0,
    "debug_level":  1
}