121 lines
3.4 KiB
Ruby
121 lines
3.4 KiB
Ruby
require 'active_support/core_ext/class/inheritable_attributes'
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module ActionController
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# ActionController::Metal provides a way to get a valid Rack application from a controller.
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#
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# In AbstractController, dispatching is triggered directly by calling #process on a new controller.
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# ActionController::Metal provides an #action method that returns a valid Rack application for a
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# given action. Other rack builders, such as Rack::Builder, Rack::URLMap, and the Rails router,
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# can dispatch directly to the action returned by FooController.action(:index).
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class Metal < AbstractController::Base
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abstract!
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# :api: public
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attr_internal :params, :env
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# Returns the last part of the controller's name, underscored, without the ending
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# "Controller". For instance, MyApp::MyPostsController would return "my_posts" for
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# controller_name
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#
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# ==== Returns
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# String
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def self.controller_name
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@controller_name ||= controller_path.split("/").last
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end
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# Delegates to the class' #controller_name
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def controller_name
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self.class.controller_name
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end
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# The details below can be overridden to support a specific
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# Request and Response object. The default ActionController::Base
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# implementation includes RackDelegation, which makes a request
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# and response object available. You might wish to control the
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# environment and response manually for performance reasons.
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attr_internal :status, :headers, :content_type, :response
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def initialize(*)
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@_headers = {}
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super
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end
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# Basic implementations for content_type=, location=, and headers are
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# provided to reduce the dependency on the RackDelegation module
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# in Renderer and Redirector.
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def content_type=(type)
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headers["Content-Type"] = type.to_s
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end
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def location=(url)
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headers["Location"] = url
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end
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def status=(status)
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@_status = Rack::Utils.status_code(status)
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end
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# :api: private
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def dispatch(name, env)
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@_env = env
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@_env['action_controller.instance'] = self
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process(name)
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to_a
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end
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# :api: private
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def to_a
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response ? response.to_a : [status, headers, response_body]
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end
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class ActionEndpoint
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@@endpoints = Hash.new {|h,k| h[k] = Hash.new {|sh,sk| sh[sk] = {} } }
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def self.for(controller, action, stack)
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@@endpoints[controller][action][stack] ||= begin
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endpoint = new(controller, action)
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stack.build(endpoint)
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end
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end
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def initialize(controller, action)
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@controller, @action = controller, action
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@_formats = [Mime::HTML]
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end
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def call(env)
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@controller.new.dispatch(@action, env)
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end
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end
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extlib_inheritable_accessor(:middleware_stack) { ActionDispatch::MiddlewareStack.new }
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def self.use(*args)
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middleware_stack.use(*args)
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end
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def self.middleware
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middleware_stack
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end
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def self.call(env)
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action(env['action_dispatch.request.path_parameters'][:action]).call(env)
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end
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# Return a rack endpoint for the given action. Memoize the endpoint, so
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# multiple calls into MyController.action will return the same object
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# for the same action.
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#
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# ==== Parameters
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# action<#to_s>:: An action name
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#
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# ==== Returns
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# Proc:: A rack application
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def self.action(name)
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ActionEndpoint.for(self, name, middleware_stack)
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end
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end
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end
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