Audit logging

audit.rb

class AuditableMethodLogger
	def log(klass, method_name)
		# Extend the class
		klass.class_eval do
			# WARNING - this method will get overritten everytime!
			alias_method :method, method_name
			# WARNING - this method is a new method to alias the passed
			alias_method "#{method_name}_passed", method_name
			# Dyanmically define a method name or in this case, override
			define_method method_name do |*args, &block|
				puts "#{Time.now}: Called #{method_name}"
				send :method, *args, &block
				send "#{method_name}_passed", *args, &block
			end
		end
	end
end


class Something

	attr_accessor :arg
	def do_something
		puts arg
	end

	def do_something_else(*args)
		args.each {|arg| puts arg}
	end
end


something = Something.new
something.arg = "Testing"

audit = AuditableMethodLogger.new
audit.log(Something, :do_something)
audit.log(Something, :do_something_else)

something.do_something
something.do_something_else("Hello", "world")