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|
module Rack
module Bug
# MustachePanel is a Rack::Bug panel which tracks the time spent rendering
# Mustache views as well as all the variables accessed during view
# rendering.
#
# It can be used to track down slow partials and ensure you're only
# generating data you need.
#
# Also, it's fun.
class MustachePanel < Panel
require "rack/bug/panels/mustache_panel/mustache_extension"
# The view is responsible for rendering our panel. While Rack::Bug
# takes care of the nav, the content rendered by View is used for
# the panel itself.
class View < Mustache
self.path = ::File.dirname(__FILE__) + '/mustache_panel'
# We track the render times of all the Mustache views on this
# page load.
def times
MustachePanel.times.map do |key, value|
{ :key => key, :value => value }
end
end
# Any variables used in this page load are collected and displayed.
def variables
vars = MustachePanel.variables.sort_by { |key, _| key.to_s }
vars.map do |key, value|
# Arrays can get too huge. Just show the first 10 to give you
# some idea.
if value.is_a?(Array) && value.size > 10
size = value.size
value = value.first(10)
value << "...and #{size - 10} more"
end
{ :key => key, :value => value.inspect }
end
end
end
# Clear out our page load-specific variables.
def self.reset
Thread.current["rack.bug.mustache.times"] = {}
Thread.current["rack.bug.mustache.vars"] = {}
end
# The view render times for this page load
def self.times
Thread.current["rack.bug.mustache.times"] ||= {}
end
# The variables used on this page load
def self.variables
Thread.current["rack.bug.mustache.vars"] ||= {}
end
# The name of this Rack::Bug panel
def name
"mustache"
end
# The string used for our tab in Rack::Bug's navigation bar
def heading
"{{%.2fms}}" % self.class.times.values.inject(0.0) do |sum, obj|
sum + obj
end
end
# The content of our Rack::Bug panel
def content
View.render
ensure
self.class.reset
end
end
end
end
|
