class Rack::GoogleAnalytics

Constants

DEFAULT
EVENT_TRACKING_KEY
VERSION

Public Class Methods

new(app, options = {}) click to toggle source
# File lib/rack/google-analytics.rb, line 11
def initialize(app, options = {})
  @app, @options = app, DEFAULT.merge(options)
end

Public Instance Methods

_call(env) click to toggle source
# File lib/rack/google-analytics.rb, line 17
def _call(env)
  @status, @headers, @body = @app.call(env)
  return [@status, @headers, @body] unless html?
  response = Rack::Response.new([], @status, @headers)
  @options[:tracker_vars] = env["google_analytics.custom_vars"] || []

  if response.ok?
    # Write out the events now
    @options[:tracker_vars] += (env[EVENT_TRACKING_KEY]) unless env[EVENT_TRACKING_KEY].nil?

    # Get any stored events from a redirection
    session = env["rack.session"]
    stored_events = session.delete(EVENT_TRACKING_KEY) if session
    @options[:tracker_vars] += stored_events unless stored_events.nil?
  elsif response.redirection? && env["rack.session"]
    # Store the events until next time
    env["rack.session"][EVENT_TRACKING_KEY] = env[EVENT_TRACKING_KEY]
  end

  @options[:tracker] = expand_tracker(env, @options[:tracker])

  @body.each { |fragment| response.write inject(fragment) }
  @body.close if @body.respond_to?(:close)

  response.finish
end
call(env) click to toggle source
# File lib/rack/google-analytics.rb, line 15
def call(env); dup._call(env); end

Private Instance Methods

expand_tracker(env, tracker) click to toggle source
# File lib/rack/google-analytics.rb, line 55
def expand_tracker(env, tracker)
  tracker.respond_to?(:call) ? tracker.call(env) : tracker
end
html?() click to toggle source
# File lib/rack/google-analytics.rb, line 46
def html?; @headers['Content-Type'] =~ /html/; end
inject(response) click to toggle source
# File lib/rack/google-analytics.rb, line 48
def inject(response)
  @tracker_options = { cookieDomain: @options[:domain] }.select{|k,v| v }.to_json
  @template ||= ::ERB.new ::File.read ::File.expand_path("../templates/async.erb",__FILE__)

  response.gsub(%r{</head>}, @template.result(binding) + "</head>")
end