puma on_worker_boot

puma.rb

on_worker_boot do
  request_thread_count = Puma.cli_config.options[:max_threads]
  Sidekiq.configure_client do |cfg|
    cfg.redis = ConnectionPool.new(:size => 10, :timeout => 3) { Redis.connect }
  end

  cmdline = `cat /proc/#{$$}/cmdline`
  # compress assets
  # reference: app.rb - L:97
  if Puma.cli_config.options[:environment] == 'production' and cmdline.include? 'worker 0'
    require 'less'
    require 'uglifier'
    puts '[compress] starting compress assets ..'

    compile_proc = -> (file) {
      content = File.read(file)

      if file.include? '.less'
        less_dir = File.join(pub, 'static', 'css')
        parser = Less::Parser.new(paths: [ less_dir ])
        parser.parse(content).to_css(compress: true).gsub(/\r|\n/, '')
      elsif file.include? '.js'
        Uglifier.compile(content)
      else
        content
      end
    }

    less_dir = File.join(pub, 'static', 'css')
    pipe_dir = File.join(pub, 'static', 'assets', 'pipe')
    js_dir = File.join(pub, 'static', 'js')

    less_files = %w(saucer.less bootstrap.css).map { |f| "#{less_dir}/#{f}" }
    less_ja_files = %w(saucer.less saucer-ja.less bootstrap.css).map { |f| "#{less_dir}/#{f}" }
    js_files = %w(jquery.min.js jquery.lazy.min.js jquery.powertip.min.js moment.min.js ubitinfo.js).map { |f| "#{js_dir}/#{f}" }

    less_compiled = File.join(pipe_dir, 'stylesheet.css')
    less_ja_compiled = File.join(pipe_dir, 'stylesheet-ja.css')
    js_compiled = File.join(pipe_dir, 'javascript.js')

    _less = ''
    _less_ja = ''
    _js = ''

    less_files.each { |f| _less << compile_proc.call(f) }
    less_ja_files.each { |f| _less_ja << compile_proc.call(f) }
    js_files.each { |f| _js << compile_proc.call(f) }

    File.open(less_compiled, 'w') { |f| f.write _less }
    File.open(less_ja_compiled, 'w') { |f| f.write _less_ja }
    File.open(js_compiled, 'w') { |f| f.write _js }
    puts '[compress] done.'
  end
end