Add CssFetcher

Author: michael-misshore

.rubocop_todo.yml

@@ -1,12 +1,12 @@
 # This configuration was generated by
 # `rubocop --auto-gen-config`
-# on 2015-10-01 20:43:37 -0500 using RuboCop version 0.34.1.
+# on 2015-10-03 13:02:27 -0500 using RuboCop version 0.34.1.
 # The point is for the user to remove these configuration records
 # one by one as the offenses are removed from the code base.
 # Note that changes in the inspected code, or installation of new
 # versions of RuboCop, may require this file to be generated again.
 
-# Offense count: 2
+# Offense count: 1
 # Configuration parameters: AllowURI, URISchemes.
 Metrics/LineLength:
   Max: 90

lib/critical_path_css/css_fetcher.rb

@@ -0,0 +1,23 @@
+module CriticalPathCss
+  class CssFetcher
+    require 'phantomjs'
+    require 'critical_path_css/configuration'
+
+    PENTHOUSE_PATH = "#{File.dirname(__FILE__)}/../penthouse/penthouse.js"
+
+    def initialize(main_css_relative_path)
+      @main_css_path = "#{Rails.root}/public#{main_css_relative_path}"
+      @config = Configuration.new
+    end
+
+    def fetch
+      @config.routes.map { |route| [route, css_for_route(route)] }.to_h
+    end
+
+    private
+
+    def css_for_route(route)
+      Phantomjs.run(PENTHOUSE_PATH, @config.base_url + route, @main_css_path)
+    end
+  end
+end

lib/critical_path_css_rails.rb

@@ -1,16 +1,10 @@
 module CriticalPathCss
-  require 'phantomjs'
+  require 'critical_path_css/css_fetcher'
 
   CACHE_NAMESPACE = 'critical-path-css'
-  PENTHOUSE_PATH  = "#{File.dirname(__FILE__)}/penthouse/penthouse.js"
-
-  def self.generate(main_css_path)
-    full_main_css_path = "#{Rails.root}/public#{main_css_path}"
-    config = CriticalPathCss::Configuration.new(Rails.root, Rails.env)
-
-    config.routes.each do |route|
-      css = Phantomjs.run(PENTHOUSE_PATH, config.base_url + route, full_main_css_path)
 
+  def self.generate(main_css_relative_path)
+    CssFetcher.new(main_css_relative_path).fetch.each do |route, css|
       Rails.cache.write(route, css, namespace: CACHE_NAMESPACE)
     end
   end