First pass

.gitignore

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+*.gem
+.bundle
+Gemfile.lock
+pkg/*

Gemfile

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+source "http://rubygems.org"
+
+# Specify your gem's dependencies in controller_filter_logging.gemspec
+gemspec

Rakefile

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+require 'bundler'
+Bundler::GemHelper.install_tasks

controller_filter_logging.gemspec

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+# -*- encoding: utf-8 -*-
+$:.push File.expand_path("../lib", __FILE__)
+require "controller_filter_logging/version"
+
+Gem::Specification.new do |s|
+  s.name        = "controller_filter_logging"
+  s.version     = ControllerFilterLogging::VERSION
+  s.platform    = Gem::Platform::RUBY
+  s.authors     = ["Jon Moses"]
+  s.email       = ["jon@burningbush.us"]
+  s.homepage    = ""
+  s.summary     = %q{Bring back controller filter logging to rails 3}
+  s.description = %q{Gem to log execution and results of before_filter's for Rails 3}
+
+  s.rubyforge_project = "controller_filter_logging"
+
+  s.files         = `git ls-files`.split("\n")
+  s.test_files    = `git ls-files -- {test,spec,features}/*`.split("\n")
+  s.executables   = `git ls-files -- bin/*`.split("\n").map{ |f| File.basename(f) }
+  s.require_paths = ["lib"]
+end

init.rb

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+require 'lib/controller_filter_logging' unless Rails.env.production?

lib/controller_filter_logging.rb

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+module AbstractController::Callbacks::ClassMethods
+  def before_filter_with_logging(filter_name, *args)
+    create_logging_filter(filter_name)
+    before_filter_without_logging "#{filter_name}_with_logging".to_sym, *args
+  end
+  alias_method_chain :before_filter, :logging
+
+  def skip_before_filter_with_logging(filter_name, *args)
+    skip_before_filter_without_logging("#{filter_name}_with_logging".to_sym, *args)
+  end
+  alias_method_chain :skip_before_filter, :logging
+
+  def prepend_before_filter_with_logging(filter_name, *args)
+    create_logging_filter(filter_name)
+    prepend_before_filter_without_logging("#{filter_name}_with_logging".to_sym, *args)
+  end
+  alias_method_chain :prepend_before_filter, :logging
+
+  def create_logging_filter(filter_name)
+    define_method("#{filter_name}_with_logging") do
+      Rails.logger.debug("Entering before_filter: #{filter_name}")
+      send(filter_name).tap do |result|
+        Rails.logger.debug(" result: #{result}")
+      end
+    end
+  end
+end

lib/controller_filter_logging/version.rb

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+module ControllerFilterLogging
+  VERSION = "0.0.1"
+end