1 files changed, 48 insertions, 0 deletions
diff --git a/Com/MusicMeetsComics/Server/Logger.hs b/Com/MusicMeetsComics/Server/Logger.hs
new file mode 100644
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--- /dev/null
+++ b/Com/MusicMeetsComics/Server/Logger.hs
@@ -0,0 +1,48 @@
+{-# LANGUAGE OverloadedStrings #-}
+{-# LANGUAGE NoImplicitPrelude #-}
+module Com.MusicMeetsComics.Server.Logger
+  ( adapt
+  , defaultLogEnv
+  , logMsg
+  , runKatipT
+  , KatipT(..)
+  , Katip(..)
+  , LogEnv
+  , Severity(..)
+  ) where
+
+import           Control.Monad.Logger
+import qualified Control.Monad.Logger as Logger
+import           Katip
+import           Protolude
+import qualified System.IO as IO
+import qualified System.Log.FastLogger as FastLogger
+
+defaultLogEnv :: IO LogEnv
+defaultLogEnv = do
+  handleScribe <- mkHandleScribe ColorIfTerminal IO.stdout DebugS V2
+  env <- initLogEnv "hero" "production"
+  registerScribe "stdout" handleScribe defaultScribeSettings env
+
+fromLevel :: LogLevel -> Severity
+fromLevel LevelDebug = DebugS
+fromLevel LevelInfo = InfoS
+fromLevel LevelWarn = WarningS
+fromLevel LevelError = ErrorS
+fromLevel (LevelOther _) = NoticeS
+
+-- | Transforms Katip logMsg into monadLoggerLog to be used inside
+-- MonadLogger monad
+adapt ::
+     (ToLogStr msg, Applicative m, Katip m)
+  => (Namespace -> Severity -> Katip.LogStr -> m ())
+  -> Loc
+  -> LogSource
+  -> LogLevel
+  -> msg
+  -> m ()
+adapt f _ src lvl msg = f ns (fromLevel lvl) $ logStr' msg
+  where
+    ns = Namespace [src]
+    -- not sure how fast this is going to be
+    logStr' = Katip.logStr . FastLogger.fromLogStr . Logger.toLogStr