1 files changed, 52 insertions, 0 deletions
diff --git a/actionpack/lib/action_controller/metal/rescuable.rb b/actionpack/lib/action_controller/metal/rescuable.rb
new file mode 100644
index 0000000000..029e643d93
--- /dev/null
+++ b/actionpack/lib/action_controller/metal/rescuable.rb
@@ -0,0 +1,52 @@
+module ActionController #:nodoc:
+  # Actions that fail to perform as expected throw exceptions. These
+  # exceptions can either be rescued for the public view (with a nice
+  # user-friendly explanation) or for the developers view (with tons of
+  # debugging information). The developers view is already implemented by
+  # the Action Controller, but the public view should be tailored to your
+  # specific application.
+  #
+  # The default behavior for public exceptions is to render a static html
+  # file with the name of the error code thrown.  If no such file exists, an
+  # empty response is sent with the correct status code.
+  #
+  # You can override what constitutes a local request by overriding the
+  # <tt>local_request?</tt> method in your own controller. Custom rescue
+  # behavior is achieved by overriding the <tt>rescue_action_in_public</tt>
+  # and <tt>rescue_action_locally</tt> methods.
+  module Rescue
+    extend ActiveSupport::Concern
+
+    included do
+      include ActiveSupport::Rescuable
+    end
+
+    module ClassMethods
+      # This can be removed once we can move action(:_rescue_action) into middlewares.rb
+      # Currently, it does controller.method(:rescue_action), which is hiding the implementation
+      # difference between the old and new base.
+      def rescue_action(env)
+        action(:_rescue_action).call(env)
+      end
+    end
+
+    attr_internal :rescued_exception
+
+    private
+      def method_for_action(action_name)
+        return action_name if self.rescued_exception = request.env.delete("action_dispatch.rescue.exception")
+        super
+      end
+
+      def _rescue_action
+        rescue_with_handler(rescued_exception) || raise(rescued_exception)
+      end
+
+      def process_action(*)
+        super
+      rescue Exception => exception
+        self.rescued_exception = exception
+        _rescue_action
+      end
+  end
+end