cjbottaro · May 4, 2017 19:50 · May 4, 2017
diff --git a/config.exs b/config.exs
@@ -0,0 +1,3 @@
+config :gnat, logger: [
+  level: :info
+]
diff --git a/logger.ex b/logger.ex
@@ -0,0 +1,3 @@
+defmodule Gnat.Stream.Logger do
+  use Gnat.Logging, otp_app: :gnat
+end
diff --git a/logging.ex b/logging.ex
@@ -0,0 +1,29 @@
+defmodule Gnat.Logging do
+
+  defmacro __using__(options) do
+    quote bind_quoted: [otp_app: options[:otp_app]] do
+      require Logger
+
+      def debug(message, metadata \\ []), do: log(:debug, message, metadata)
+      def info(message,  metadata \\ []), do: log(:info,  message, metadata)
+      def warn(message,  metadata \\ []), do: log(:warn,  message, metadata)
+      def error(message, metadata \\ []), do: log(:error, message, metadata)
+
+      @otp_app otp_app
+
+      def log(level, message, metadata \\ []) do
+        config = Application.get_env(@otp_app, :logger, [])
+        config_level = Keyword.get(config, :level, :debug)
+        if level_to_int(config_level) <= level_to_int(level) do
+          Logger.log(level, message, metadata)
+        end
+      end
+
+      defp level_to_int(:debug), do: 0
+      defp level_to_int(:info),  do: 1
+      defp level_to_int(:warn),  do: 2
+      defp level_to_int(:error), do: 3
+    end
+  end
+
+end
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