Adding RackLog and DummyLog to simplify configuration

init.rb

@@ -0,0 +1 @@
+require "oink"

lib/oink.rb

@@ -1,9 +1,11 @@
 module Oink
+  autoload :DummyLog, "oink/dummy_log"
   autoload :Formatter, "oink/formatter"
   autoload :Log, "oink/log"
   autoload :MethodTracker, "oink/method_tracker"
   autoload :Metrics, "oink/metrics"
   autoload :Middleware, "oink/middleware"
+  autoload :RackLog, "oink/rack_log"
 
   def self.measure(name, &block)
     result = nil

lib/oink/dummy_log.rb

@@ -0,0 +1,15 @@
+module Oink
+  class DummyLog
+
+    def metric(name)
+    end
+
+    def []=(key, value)
+    end
+
+    def transaction
+      yield
+    end
+
+  end
+end

lib/oink/log.rb

@@ -5,11 +5,15 @@ class Log
 
     def initialize(logger, extra_metadata = [])
       @logger = logger
-      @metadata = %w[transaction date time] + extra_metadata
+      @metadata = default_metadata + extra_metadata
       Metrics::Extensions.add_to(self)
       write_headers
     end
 
+    def default_metadata
+      %w[transaction date time]
+    end
+
     def write_headers
       write_header "Start-Date", Time.now.utc.strftime("%F %T")
       write_header "Fields", (@metadata + metrics.map(&:field_names)).join(" ")

lib/oink/rack_log.rb

@@ -0,0 +1,9 @@
+module Oink
+  class RackLog < Log
+
+    def default_metadata
+      super + %w[controller_name action_name uri http_method response_code]
+    end
+
+  end
+end