give all endpoints a superclass

actionpack/lib/action_dispatch/routing/endpoint.rb

+module ActionDispatch
+  module Routing
+    class Endpoint # :nodoc:
+      def dispatcher?;   false; end
+      def redirect?;     false; end
+      def matches?(req); true;  end
+      def app;           self;  end
+    end
+  end
+end

actionpack/lib/action_dispatch/routing/mapper.rb

@@ -6,6 +6,7 @@
 require 'active_support/core_ext/module/remove_method'
 require 'active_support/inflector'
 require 'action_dispatch/routing/redirection'
+require 'action_dispatch/routing/endpoint'
 
 module ActionDispatch
   module Routing
@@ -15,10 +16,10 @@ class Mapper
                        :controller, :action, :path_names, :constraints,
                        :shallow, :blocks, :defaults, :options]
 
-      class Constraints #:nodoc:
+      class Constraints < Endpoint #:nodoc:
         attr_reader :app, :constraints
 
-        def initialize(app, constraints, request, dispatcher_p, redirect_p)
+        def initialize(app, constraints, request, dispatcher_p)
           # Unwrap Constraints objects.  I don't actually think it's possible
           # to pass a Constraints object to this constructor, but there were
           # multiple places that kept testing children of this object.  I
@@ -29,13 +30,11 @@ def initialize(app, constraints, request, dispatcher_p, redirect_p)
           end
 
           @dispatcher = dispatcher_p
-          @redirect   = redirect_p
 
           @app, @constraints, @request = app, constraints, request
         end
 
         def dispatcher?; @dispatcher; end
-        def redirect?; @redirect; end
 
         def matches?(req)
           @constraints.all? do |constraint|
@@ -220,24 +219,21 @@ def normalize_conditions!
           end
 
           def app
-            dispatcher_p = false
-            redirect     = false
-
             # Unwrap any constraints so we can see what's inside for route generation.
             # This allows the formatter to skip over any mounted applications or redirects
             # that shouldn't be matched when using a url_for without a route name.
             if to.respond_to?(:call)
-              endpoint = to
-              redirect = Redirect === endpoint
-            else
-              dispatcher_p = true
-              endpoint = dispatcher
-            end
-
-            if blocks.any?
-              Constraints.new(endpoint, blocks, @set.request_class, dispatcher_p, redirect)
+              if Redirect === to
+                to
+              else
+                Constraints.new(to, blocks, @set.request_class, false)
+              end
             else
-              Constraints.new(endpoint, blocks, @set.request_class, dispatcher_p, redirect)
+              if blocks.any?
+                Constraints.new(dispatcher, blocks, @set.request_class, true)
+              else
+                dispatcher
+              end
             end
           end
 

actionpack/lib/action_dispatch/routing/redirection.rb

@@ -3,10 +3,11 @@
 require 'active_support/core_ext/array/extract_options'
 require 'rack/utils'
 require 'action_controller/metal/exceptions'
+require 'action_dispatch/routing/endpoint'
 
 module ActionDispatch
   module Routing
-    class Redirect # :nodoc:
+    class Redirect < Endpoint # :nodoc:
       attr_reader :status, :block
 
       def initialize(status, block)
@@ -14,9 +15,13 @@ def initialize(status, block)
         @block  = block
       end
 
+      def redirect?; true; end
+
       def call(env)
-        req = Request.new(env)
+        serve Request.new env
+      end
 
+      def serve(req)
         # If any of the path parameters has an invalid encoding then
         # raise since it's likely to trigger errors further on.
         req.path_parameters.each do |key, value|

actionpack/lib/action_dispatch/routing/route_set.rb

@@ -8,6 +8,7 @@
 require 'active_support/core_ext/array/extract_options'
 require 'action_controller/metal/exceptions'
 require 'action_dispatch/http/request'
+require 'action_dispatch/routing/endpoint'
 
 module ActionDispatch
   module Routing
@@ -20,14 +21,20 @@ class RouteSet #:nodoc:
 
       PARAMETERS_KEY = 'action_dispatch.request.path_parameters'
 
-      class Dispatcher #:nodoc:
+      class Dispatcher < Routing::Endpoint #:nodoc:
         def initialize(defaults)
           @defaults = defaults
           @controller_class_names = ThreadSafe::Cache.new
         end
 
+        def dispatcher?; true; end
+
         def call(env)
-          params = env[PARAMETERS_KEY]
+          serve Request.new env
+        end
+
+        def serve(req)
+          params = req.path_parameters
 
           # If any of the path parameters has an invalid encoding then
           # raise since it's likely to trigger errors further on.
@@ -46,7 +53,7 @@ def call(env)
             return [404, {'X-Cascade' => 'pass'}, []]
           end
 
-          dispatch(controller, params[:action], env)
+          dispatch(controller, params[:action], req.env)
         end
 
         def prepare_params!(params)