module PrerenderRailsEmbedded - prerender_rails

flatten_js_to_html(url) click to toggle source

# File lib/prerender_rails_embedded.rb, line 5
def self.flatten_js_to_html(url)
  out = ''
  thread = nil
  pid = -1
  begin
  Timeout::timeout(30) do
    thread = Thread.new do
      IO.popen(phantomjs_invocation(url)) do |io|
        pid = io.pid
        Rails.logger.debug("Spawing new phantomjs processo with pid: #{pid}")
        io.read
      end
    end
    out += thread.value
  end
  rescue Timeout::Error
    Rails.logger.debug('triggering timed out')

    if pid_exists?(pid)
      Rails.logger.warn("phantomjs with pid##{pid} timed out")

      Process.kill 9, pid
      out += '<html><head><meta name="robots" content="noindex, noarchive " /></head><body></body></html>'
    end
    if thread && thread.alive?
      Thread.kill(thread)
    end
  end
  out
end

local_renderer() click to toggle source

# File lib/prerender_rails_embedded.rb, line 51
def self.local_renderer
  Proc.new do |env|
    flatten_js_to_html(Rack::Request.new(env).url)
  end
end

phantomjs_invocation(url) click to toggle source

# File lib/prerender_rails_embedded.rb, line 47
def self.phantomjs_invocation(url)
  [Phantomjs.path , '--load-images=false', '--ignore-ssl-errors=true', '--ssl-protocol=TLSv1', '--disk-cache=true', '--max-disk-cache-size=524228', "#{File.dirname(__FILE__)}/prerender_rails_embedded.js", url]
end

pid_exists?(pid) click to toggle source

# File lib/prerender_rails_embedded.rb, line 37
def self.pid_exists?(pid)
  begin
    Process.kill 0, pid
    return true
  rescue Errno::ESRCH
    return false
  end

end