[CLOUD-319] Make mixlib-log an optional dependencyryan/cloud-319

This change makes mixlib-log an optional dependency. When it's available
in the LOAD_PATH it will be used by default, otherwise, all logging will
will be forwarded to a null logger that does nothing. This is useful for
cases where small utilities can consume mixlib-authentication and not
have to pull in additional gems.

Signed-off-by: Ryan Cragun <me@ryan.ec>

1 files changed, 24 insertions, 0 deletions

diff --git a/lib/mixlib/authentication/null_logger.rb b/lib/mixlib/authentication/null_logger.rb
new file mode 100644
index 0000000..2bc9e31
--- /dev/null
+++ b/lib/mixlib/authentication/null_logger.rb
@@ -0,0 +1,24 @@
+module Mixlib
+  module Authentication
+    module NullLogger
+
+      attr_accessor :level
+
+      %i{debug info warn error fatal}.each do |method_name|
+        class_eval(<<-METHOD_DEFN, __FILE__, __LINE__)
+          def #{method_name}(msg=nil, &block)
+            true
+          end
+        METHOD_DEFN
+      end
+
+      %i{debug? info? warn? error? fatal?}.each do |method_name|
+        class_eval(<<-METHOD_DEFN, __FILE__, __LINE__)
+          def #{method_name}
+            false
+          end
+        METHOD_DEFN
+      end
+    end
+  end
+end