617 lines
25 KiB
Ruby
617 lines
25 KiB
Ruby
require 'fileutils'
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require 'uri'
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require 'set'
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module ActionController #:nodoc:
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# Caching is a cheap way of speeding up slow applications by keeping the result of calculations, renderings, and database calls
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# around for subsequent requests. Action Controller affords you three approaches in varying levels of granularity: Page, Action, Fragment.
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#
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# You can read more about each approach and the sweeping assistance by clicking the modules below.
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#
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# Note: To turn off all caching and sweeping, set Base.perform_caching = false.
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module Caching
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def self.included(base) #:nodoc:
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base.send(:include, Pages, Actions, Fragments, Sweeping)
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base.class_eval do
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@@perform_caching = true
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cattr_accessor :perform_caching
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end
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end
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# Page caching is an approach to caching where the entire action output of is stored as a HTML file that the web server
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# can serve without going through the Action Pack. This can be as much as 100 times faster than going through the process of dynamically
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# generating the content. Unfortunately, this incredible speed-up is only available to stateless pages where all visitors
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# are treated the same. Content management systems -- including weblogs and wikis -- have many pages that are a great fit
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# for this approach, but account-based systems where people log in and manipulate their own data are often less likely candidates.
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#
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# Specifying which actions to cache is done through the <tt>caches</tt> class method:
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#
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# class WeblogController < ActionController::Base
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# caches_page :show, :new
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# end
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#
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# This will generate cache files such as weblog/show/5 and weblog/new, which match the URLs used to trigger the dynamic
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# generation. This is how the web server is able pick up a cache file when it exists and otherwise let the request pass on to
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# the Action Pack to generate it.
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#
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# Expiration of the cache is handled by deleting the cached file, which results in a lazy regeneration approach where the cache
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# is not restored before another hit is made against it. The API for doing so mimics the options from url_for and friends:
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#
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# class WeblogController < ActionController::Base
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# def update
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# List.update(params[:list][:id], params[:list])
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# expire_page :action => "show", :id => params[:list][:id]
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# redirect_to :action => "show", :id => params[:list][:id]
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# end
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# end
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#
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# Additionally, you can expire caches using Sweepers that act on changes in the model to determine when a cache is supposed to be
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# expired.
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#
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# == Setting the cache directory
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#
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# The cache directory should be the document root for the web server and is set using Base.page_cache_directory = "/document/root".
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# For Rails, this directory has already been set to RAILS_ROOT + "/public".
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#
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# == Setting the cache extension
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#
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# By default, the cache extension is .html, which makes it easy for the cached files to be picked up by the web server. If you want
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# something else, like .php or .shtml, just set Base.page_cache_extension.
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module Pages
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def self.included(base) #:nodoc:
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base.extend(ClassMethods)
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base.class_eval do
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@@page_cache_directory = defined?(RAILS_ROOT) ? "#{RAILS_ROOT}/public" : ""
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cattr_accessor :page_cache_directory
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@@page_cache_extension = '.html'
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cattr_accessor :page_cache_extension
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end
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end
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module ClassMethods
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# Expires the page that was cached with the +path+ as a key. Example:
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# expire_page "/lists/show"
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def expire_page(path)
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return unless perform_caching
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benchmark "Expired page: #{page_cache_file(path)}" do
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File.delete(page_cache_path(path)) if File.exists?(page_cache_path(path))
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end
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end
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# Manually cache the +content+ in the key determined by +path+. Example:
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# cache_page "I'm the cached content", "/lists/show"
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def cache_page(content, path)
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return unless perform_caching
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benchmark "Cached page: #{page_cache_file(path)}" do
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FileUtils.makedirs(File.dirname(page_cache_path(path)))
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File.open(page_cache_path(path), "wb+") { |f| f.write(content) }
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end
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end
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# Caches the +actions+ using the page-caching approach that'll store the cache in a path within the page_cache_directory that
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# matches the triggering url.
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def caches_page(*actions)
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return unless perform_caching
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actions.each do |action|
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class_eval "after_filter { |c| c.cache_page if c.action_name == '#{action}' }"
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end
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end
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private
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def page_cache_file(path)
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name = ((path.empty? || path == "/") ? "/index" : URI.unescape(path))
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name << page_cache_extension unless (name.split('/').last || name).include? '.'
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return name
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end
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def page_cache_path(path)
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page_cache_directory + page_cache_file(path)
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end
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end
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# Expires the page that was cached with the +options+ as a key. Example:
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# expire_page :controller => "lists", :action => "show"
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def expire_page(options = {})
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return unless perform_caching
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if options[:action].is_a?(Array)
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options[:action].dup.each do |action|
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self.class.expire_page(url_for(options.merge(:only_path => true, :skip_relative_url_root => true, :action => action)))
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end
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else
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self.class.expire_page(url_for(options.merge(:only_path => true, :skip_relative_url_root => true)))
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end
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end
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# Manually cache the +content+ in the key determined by +options+. If no content is provided, the contents of response.body is used
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# If no options are provided, the current +options+ for this action is used. Example:
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# cache_page "I'm the cached content", :controller => "lists", :action => "show"
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def cache_page(content = nil, options = {})
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return unless perform_caching && caching_allowed
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self.class.cache_page(content || response.body, url_for(options.merge(:only_path => true, :skip_relative_url_root => true, :format => params[:format])))
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end
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private
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def caching_allowed
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request.get? && response.headers['Status'].to_i == 200
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end
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end
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# Action caching is similar to page caching by the fact that the entire output of the response is cached, but unlike page caching,
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# every request still goes through the Action Pack. The key benefit of this is that filters are run before the cache is served, which
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# allows for authentication and other restrictions on whether someone is allowed to see the cache. Example:
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#
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# class ListsController < ApplicationController
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# before_filter :authenticate, :except => :public
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# caches_page :public
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# caches_action :show, :feed
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# end
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#
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# In this example, the public action doesn't require authentication, so it's possible to use the faster page caching method. But both the
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# show and feed action are to be shielded behind the authenticate filter, so we need to implement those as action caches.
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#
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# Action caching internally uses the fragment caching and an around filter to do the job. The fragment cache is named according to both
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# the current host and the path. So a page that is accessed at http://david.somewhere.com/lists/show/1 will result in a fragment named
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# "david.somewhere.com/lists/show/1". This allows the cacher to differentiate between "david.somewhere.com/lists/" and
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# "jamis.somewhere.com/lists/" -- which is a helpful way of assisting the subdomain-as-account-key pattern.
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#
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# Different representations of the same resource, e.g. <tt>http://david.somewhere.com/lists</tt> and <tt>http://david.somewhere.com/lists.xml</tt>
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# are treated like separate requests and so are cached separately. Keep in mind when expiring an action cache that <tt>:action => 'lists'</tt> is not the same
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# as <tt>:action => 'list', :format => :xml</tt>.
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module Actions
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def self.included(base) #:nodoc:
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base.extend(ClassMethods)
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base.class_eval do
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attr_accessor :rendered_action_cache, :action_cache_path
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alias_method_chain :protected_instance_variables, :action_caching
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end
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end
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def protected_instance_variables_with_action_caching
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protected_instance_variables_without_action_caching + %w(@action_cache_path)
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end
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module ClassMethods
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# Declares that +actions+ should be cached.
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# See ActionController::Caching::Actions for details.
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def caches_action(*actions)
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return unless perform_caching
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action_cache_filter = ActionCacheFilter.new(*actions)
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before_filter action_cache_filter
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after_filter action_cache_filter
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end
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end
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def expire_action(options = {})
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return unless perform_caching
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if options[:action].is_a?(Array)
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options[:action].dup.each do |action|
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expire_fragment(ActionCachePath.path_for(self, options.merge({ :action => action })))
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end
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else
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expire_fragment(ActionCachePath.path_for(self, options))
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end
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end
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class ActionCacheFilter #:nodoc:
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def initialize(*actions)
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@actions = Set.new actions
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end
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def before(controller)
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return unless @actions.include?(controller.action_name.to_sym)
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cache_path = ActionCachePath.new(controller, {})
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if cache = controller.read_fragment(cache_path.path)
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controller.rendered_action_cache = true
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set_content_type!(controller, cache_path.extension)
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controller.send(:render_text, cache)
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false
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else
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controller.action_cache_path = cache_path
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end
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end
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def after(controller)
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return if !@actions.include?(controller.action_name.to_sym) || controller.rendered_action_cache
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controller.write_fragment(controller.action_cache_path.path, controller.response.body)
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end
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private
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def set_content_type!(controller, extension)
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controller.response.content_type = Mime::EXTENSION_LOOKUP[extension].to_s if extension
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end
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end
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class ActionCachePath
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attr_reader :path, :extension
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class << self
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def path_for(controller, options)
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new(controller, options).path
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end
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end
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def initialize(controller, options = {})
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@extension = extract_extension(controller.request.path)
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path = controller.url_for(options).split('://').last
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normalize!(path)
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add_extension!(path, @extension)
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@path = URI.unescape(path)
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end
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private
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def normalize!(path)
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path << 'index' if path[-1] == ?/
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end
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def add_extension!(path, extension)
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path << ".#{extension}" if extension
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end
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def extract_extension(file_path)
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# Don't want just what comes after the last '.' to accomodate multi part extensions
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# such as tar.gz.
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file_path[/^[^.]+\.(.+)$/, 1]
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end
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end
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end
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# Fragment caching is used for caching various blocks within templates without caching the entire action as a whole. This is useful when
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# certain elements of an action change frequently or depend on complicated state while other parts rarely change or can be shared amongst multiple
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# parties. The caching is doing using the cache helper available in the Action View. A template with caching might look something like:
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#
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# <b>Hello <%= @name %></b>
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# <% cache do %>
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# All the topics in the system:
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# <%= render :partial => "topic", :collection => Topic.find(:all) %>
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# <% end %>
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#
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# This cache will bind to the name of action that called it. So you would be able to invalidate it using
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# <tt>expire_fragment(:controller => "topics", :action => "list")</tt> -- if that was the controller/action used. This is not too helpful
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# if you need to cache multiple fragments per action or if the action itself is cached using <tt>caches_action</tt>. So instead we should
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# qualify the name of the action used with something like:
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#
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# <% cache(:action => "list", :action_suffix => "all_topics") do %>
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#
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# That would result in a name such as "/topics/list/all_topics", which wouldn't conflict with any action cache and neither with another
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# fragment using a different suffix. Note that the URL doesn't have to really exist or be callable. We're just using the url_for system
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# to generate unique cache names that we can refer to later for expirations. The expiration call for this example would be
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# <tt>expire_fragment(:controller => "topics", :action => "list", :action_suffix => "all_topics")</tt>.
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#
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# == Fragment stores
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#
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# In order to use the fragment caching, you need to designate where the caches should be stored. This is done by assigning a fragment store
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# of which there are four different kinds:
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#
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# * FileStore: Keeps the fragments on disk in the +cache_path+, which works well for all types of environments and shares the fragments for
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# all the web server processes running off the same application directory.
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# * MemoryStore: Keeps the fragments in memory, which is fine for WEBrick and for FCGI (if you don't care that each FCGI process holds its
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# own fragment store). It's not suitable for CGI as the process is thrown away at the end of each request. It can potentially also take
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# up a lot of memory since each process keeps all the caches in memory.
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# * DRbStore: Keeps the fragments in the memory of a separate, shared DRb process. This works for all environments and only keeps one cache
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# around for all processes, but requires that you run and manage a separate DRb process.
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# * MemCacheStore: Works like DRbStore, but uses Danga's MemCache instead.
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# Requires the ruby-memcache library: gem install ruby-memcache.
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#
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# Configuration examples (MemoryStore is the default):
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#
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# ActionController::Base.fragment_cache_store = :memory_store
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# ActionController::Base.fragment_cache_store = :file_store, "/path/to/cache/directory"
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# ActionController::Base.fragment_cache_store = :drb_store, "druby://localhost:9192"
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# ActionController::Base.fragment_cache_store = :mem_cache_store, "localhost"
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# ActionController::Base.fragment_cache_store = MyOwnStore.new("parameter")
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module Fragments
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def self.included(base) #:nodoc:
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base.class_eval do
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@@fragment_cache_store = MemoryStore.new
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cattr_reader :fragment_cache_store
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def self.fragment_cache_store=(store_option)
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store, *parameters = *([ store_option ].flatten)
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@@fragment_cache_store = if store.is_a?(Symbol)
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store_class_name = (store == :drb_store ? "DRbStore" : store.to_s.camelize)
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store_class = ActionController::Caching::Fragments.const_get(store_class_name)
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store_class.new(*parameters)
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else
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store
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end
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end
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end
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end
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def fragment_cache_key(name)
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name.is_a?(Hash) ? url_for(name).split("://").last : name
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end
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# Called by CacheHelper#cache
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def cache_erb_fragment(block, name = {}, options = nil)
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unless perform_caching then block.call; return end
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buffer = eval("_erbout", block.binding)
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if cache = read_fragment(name, options)
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buffer.concat(cache)
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else
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pos = buffer.length
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block.call
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write_fragment(name, buffer[pos..-1], options)
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end
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end
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def write_fragment(name, content, options = nil)
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return unless perform_caching
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key = fragment_cache_key(name)
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self.class.benchmark "Cached fragment: #{key}" do
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fragment_cache_store.write(key, content, options)
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end
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content
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end
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def read_fragment(name, options = nil)
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return unless perform_caching
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key = fragment_cache_key(name)
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self.class.benchmark "Fragment read: #{key}" do
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fragment_cache_store.read(key, options)
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end
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end
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# Name can take one of three forms:
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# * String: This would normally take the form of a path like "pages/45/notes"
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# * Hash: Is treated as an implicit call to url_for, like { :controller => "pages", :action => "notes", :id => 45 }
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# * Regexp: Will destroy all the matched fragments, example:
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# %r{pages/\d*/notes}
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# Ensure you do not specify start and finish in the regex (^$) because
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# the actual filename matched looks like ./cache/filename/path.cache
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# Regexp expiration is not supported on caches which can't iterate over
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# all keys, such as memcached.
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def expire_fragment(name, options = nil)
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return unless perform_caching
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key = fragment_cache_key(name)
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if key.is_a?(Regexp)
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self.class.benchmark "Expired fragments matching: #{key.source}" do
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fragment_cache_store.delete_matched(key, options)
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end
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else
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self.class.benchmark "Expired fragment: #{key}" do
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fragment_cache_store.delete(key, options)
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end
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end
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end
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# Deprecated -- just call expire_fragment with a regular expression
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def expire_matched_fragments(matcher = /.*/, options = nil) #:nodoc:
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expire_fragment(matcher, options)
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end
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deprecate :expire_matched_fragments => :expire_fragment
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class UnthreadedMemoryStore #:nodoc:
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def initialize #:nodoc:
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@data = {}
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end
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def read(name, options=nil) #:nodoc:
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@data[name]
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end
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def write(name, value, options=nil) #:nodoc:
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@data[name] = value
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end
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def delete(name, options=nil) #:nodoc:
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@data.delete(name)
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end
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def delete_matched(matcher, options=nil) #:nodoc:
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@data.delete_if { |k,v| k =~ matcher }
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end
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end
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module ThreadSafety #:nodoc:
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def read(name, options=nil) #:nodoc:
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@mutex.synchronize { super }
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end
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def write(name, value, options=nil) #:nodoc:
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@mutex.synchronize { super }
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end
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def delete(name, options=nil) #:nodoc:
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@mutex.synchronize { super }
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end
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def delete_matched(matcher, options=nil) #:nodoc:
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@mutex.synchronize { super }
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end
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end
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class MemoryStore < UnthreadedMemoryStore #:nodoc:
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def initialize #:nodoc:
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super
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if ActionController::Base.allow_concurrency
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@mutex = Mutex.new
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MemoryStore.send(:include, ThreadSafety)
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end
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end
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end
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class DRbStore < MemoryStore #:nodoc:
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attr_reader :address
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def initialize(address = 'druby://localhost:9192')
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super()
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@address = address
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@data = DRbObject.new(nil, address)
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end
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end
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class MemCacheStore < MemoryStore #:nodoc:
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attr_reader :addresses
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def initialize(*addresses)
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super()
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addresses = addresses.flatten
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addresses = ["localhost"] if addresses.empty?
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@addresses = addresses
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@data = MemCache.new(*addresses)
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end
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end
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class UnthreadedFileStore #:nodoc:
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attr_reader :cache_path
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def initialize(cache_path)
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@cache_path = cache_path
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end
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def write(name, value, options = nil) #:nodoc:
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ensure_cache_path(File.dirname(real_file_path(name)))
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|
File.open(real_file_path(name), "wb+") { |f| f.write(value) }
|
|
rescue => e
|
|
Base.logger.error "Couldn't create cache directory: #{name} (#{e.message})" if Base.logger
|
|
end
|
|
|
|
def read(name, options = nil) #:nodoc:
|
|
File.open(real_file_path(name), 'rb') { |f| f.read } rescue nil
|
|
end
|
|
|
|
def delete(name, options) #:nodoc:
|
|
File.delete(real_file_path(name))
|
|
rescue SystemCallError => e
|
|
# If there's no cache, then there's nothing to complain about
|
|
end
|
|
|
|
def delete_matched(matcher, options) #:nodoc:
|
|
search_dir(@cache_path) do |f|
|
|
if f =~ matcher
|
|
begin
|
|
File.delete(f)
|
|
rescue SystemCallError => e
|
|
# If there's no cache, then there's nothing to complain about
|
|
end
|
|
end
|
|
end
|
|
end
|
|
|
|
private
|
|
def real_file_path(name)
|
|
'%s/%s.cache' % [@cache_path, name.gsub('?', '.').gsub(':', '.')]
|
|
end
|
|
|
|
def ensure_cache_path(path)
|
|
FileUtils.makedirs(path) unless File.exists?(path)
|
|
end
|
|
|
|
def search_dir(dir, &callback)
|
|
Dir.foreach(dir) do |d|
|
|
next if d == "." || d == ".."
|
|
name = File.join(dir, d)
|
|
if File.directory?(name)
|
|
search_dir(name, &callback)
|
|
else
|
|
callback.call name
|
|
end
|
|
end
|
|
end
|
|
end
|
|
|
|
class FileStore < UnthreadedFileStore #:nodoc:
|
|
def initialize(cache_path)
|
|
super(cache_path)
|
|
if ActionController::Base.allow_concurrency
|
|
@mutex = Mutex.new
|
|
FileStore.send(:include, ThreadSafety)
|
|
end
|
|
end
|
|
end
|
|
end
|
|
|
|
# Sweepers are the terminators of the caching world and responsible for expiring caches when model objects change.
|
|
# They do this by being half-observers, half-filters and implementing callbacks for both roles. A Sweeper example:
|
|
#
|
|
# class ListSweeper < ActionController::Caching::Sweeper
|
|
# observe List, Item
|
|
#
|
|
# def after_save(record)
|
|
# list = record.is_a?(List) ? record : record.list
|
|
# expire_page(:controller => "lists", :action => %w( show public feed ), :id => list.id)
|
|
# expire_action(:controller => "lists", :action => "all")
|
|
# list.shares.each { |share| expire_page(:controller => "lists", :action => "show", :id => share.url_key) }
|
|
# end
|
|
# end
|
|
#
|
|
# The sweeper is assigned in the controllers that wish to have its job performed using the <tt>cache_sweeper</tt> class method:
|
|
#
|
|
# class ListsController < ApplicationController
|
|
# caches_action :index, :show, :public, :feed
|
|
# cache_sweeper :list_sweeper, :only => [ :edit, :destroy, :share ]
|
|
# end
|
|
#
|
|
# In the example above, four actions are cached and three actions are responsible for expiring those caches.
|
|
module Sweeping
|
|
def self.included(base) #:nodoc:
|
|
base.extend(ClassMethods)
|
|
end
|
|
|
|
module ClassMethods #:nodoc:
|
|
def cache_sweeper(*sweepers)
|
|
return unless perform_caching
|
|
configuration = sweepers.last.is_a?(Hash) ? sweepers.pop : {}
|
|
sweepers.each do |sweeper|
|
|
ActiveRecord::Base.observers << sweeper if defined?(ActiveRecord) and defined?(ActiveRecord::Base)
|
|
sweeper_instance = Object.const_get(Inflector.classify(sweeper)).instance
|
|
|
|
if sweeper_instance.is_a?(Sweeper)
|
|
around_filter(sweeper_instance, :only => configuration[:only])
|
|
else
|
|
after_filter(sweeper_instance, :only => configuration[:only])
|
|
end
|
|
end
|
|
end
|
|
end
|
|
end
|
|
|
|
if defined?(ActiveRecord) and defined?(ActiveRecord::Observer)
|
|
class Sweeper < ActiveRecord::Observer #:nodoc:
|
|
attr_accessor :controller
|
|
|
|
# ActiveRecord::Observer will mark this class as reloadable even though it should not be.
|
|
# However, subclasses of ActionController::Caching::Sweeper should be Reloadable
|
|
include Reloadable::Deprecated
|
|
|
|
def before(controller)
|
|
self.controller = controller
|
|
callback(:before)
|
|
end
|
|
|
|
def after(controller)
|
|
callback(:after)
|
|
# Clean up, so that the controller can be collected after this request
|
|
self.controller = nil
|
|
end
|
|
|
|
private
|
|
def callback(timing)
|
|
controller_callback_method_name = "#{timing}_#{controller.controller_name.underscore}"
|
|
action_callback_method_name = "#{controller_callback_method_name}_#{controller.action_name}"
|
|
|
|
send(controller_callback_method_name) if respond_to?(controller_callback_method_name)
|
|
send(action_callback_method_name) if respond_to?(action_callback_method_name)
|
|
end
|
|
|
|
def method_missing(method, *arguments)
|
|
return if @controller.nil?
|
|
@controller.send(method, *arguments)
|
|
end
|
|
end
|
|
end
|
|
end
|
|
end
|