4 files changed, 24 insertions, 2 deletions
diff --git a/actionpack/CHANGELOG.md b/actionpack/CHANGELOG.md
index 314aa7181c..b091d12d2c 100644
--- a/actionpack/CHANGELOG.md
+++ b/actionpack/CHANGELOG.md
@@ -1,5 +1,7 @@
 ## Rails 3.2.0 (unreleased) ##
 
+*   Log "Filter chain halted as CALLBACKNAME rendered or redirected" every time a before callback halts. *José Valim*
+
 *   You can provide a namespace for your form to ensure uniqueness of id attributes on form elements.
     The namespace attribute will be prefixed with underscore on the generate HTML id. *Vasiliy Ermolovich*
 
diff --git a/actionpack/lib/action_controller/log_subscriber.rb b/actionpack/lib/action_controller/log_subscriber.rb
index 35e29398e6..8666ecc9c8 100644
--- a/actionpack/lib/action_controller/log_subscriber.rb
+++ b/actionpack/lib/action_controller/log_subscriber.rb
@@ -29,6 +29,10 @@ module ActionController
       info(message)
     end
 
+    def halted_callback(event)
+      info "Filter chain halted as #{event.payload[:filter]} rendered or redirected"
+    end
+
     def send_file(event)
       message = "Sent file %s"
       message << " (%.1fms)"
diff --git a/actionpack/lib/action_controller/metal/instrumentation.rb b/actionpack/lib/action_controller/metal/instrumentation.rb
index 777a0ab343..640ebf5f00 100644
--- a/actionpack/lib/action_controller/metal/instrumentation.rb
+++ b/actionpack/lib/action_controller/metal/instrumentation.rb
@@ -64,7 +64,12 @@ module ActionController
       end
     end
 
-  protected
+  private
+
+    # A hook invoked everytime a before callback is halted.
+    def halted_callback_hook(filter)
+      ActiveSupport::Notifications.instrument("halted_callback.action_controller", :filter => filter)
+    end
 
     # A hook which allows you to clean up any time taken into account in
     # views wrongly, like database querying time.
diff --git a/actionpack/test/controller/log_subscriber_test.rb b/actionpack/test/controller/log_subscriber_test.rb
index ccdfcb0b2c..700fd788fa 100644
--- a/actionpack/test/controller/log_subscriber_test.rb
+++ b/actionpack/test/controller/log_subscriber_test.rb
@@ -13,6 +13,11 @@ module Another
       head :status => 406
     end
 
+    before_filter :redirector, :only => :never_executed
+
+    def never_executed
+    end
+
     def show
       render :nothing => true
     end
@@ -49,7 +54,6 @@ module Another
     def with_rescued_exception
       raise SpecialException
     end
-
   end
 end
 
@@ -86,6 +90,13 @@ class ACLogSubscriberTest < ActionController::TestCase
     assert_equal "Processing by Another::LogSubscribersController#show as HTML", logs.first
   end
 
+  def test_halted_callback
+    get :never_executed
+    wait
+    assert_equal 4, logs.size
+    assert_equal "Filter chain halted as :redirector rendered or redirected", logs.third
+  end
+
   def test_process_action
     get :show
     wait