Class: Middleware::TurboDev

Inherits:
Object
  • Object
show all
Defined in:
lib/middleware/turbo_dev.rb

Overview

Cheat and bypass Rails in development mode if the client attempts to download a static asset that’s already been downloaded.

Also ensures that assets are not cached in development mode. Around Chrome 29, the behavior of ‘must-revalidate` changed and would often not request assets that had changed.

To use, include in your project and add the following to development.rb:

require 'middleware/turbo_dev'
config.middleware.insert 0, Middleware::TurboDev

Instance Method Summary collapse

Constructor Details

#initialize(app, settings = {}) ⇒ TurboDev

Returns a new instance of TurboDev.



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# File 'lib/middleware/turbo_dev.rb', line 15

def initialize(app, settings = {})
  @app = app
end

Instance Method Details

#call(env) ⇒ Object 



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# File 'lib/middleware/turbo_dev.rb', line 19

def call(env)
  root = "#{GlobalSetting.relative_url_root}/assets/"
  is_asset = env["REQUEST_PATH"] && env["REQUEST_PATH"].starts_with?(root)

  # hack to bypass all middleware if serving assets, a lot faster 4.5 seconds -> 1.5 seconds
  if (etag = env["HTTP_IF_NONE_MATCH"]) && is_asset
    name = env["REQUEST_PATH"][(root.length)..-1]
    etag = etag.gsub "\"", ""
    asset = Rails.application.assets.find_asset(name)
    return 304, {}, [] if asset && asset.digest == etag
  end

  status, headers, response = @app.call(env)
  headers["Cache-Control"] = "no-cache" if is_asset
  [status, headers, response]
end