System.Wlog.CanLog

Type class that add ability to log messages. Supports pure and IO logging.

Documentation

class Monad m => CanLog m where

Instances of this class should explain how they add messages to their log.

Methods

dispatchMessage :: LoggerName -> Severity -> Text -> m ()

dispatchMessage :: (MonadTrans t, t n ~ m, CanLog n) => LoggerName -> Severity -> Text -> m ()

Instances

CanLog IO

Methods

dispatchMessage :: LoggerName -> Severity -> Text -> IO ()

CanLog m => CanLog (LoggerNameBox m)

Methods

dispatchMessage :: LoggerName -> Severity -> Text -> LoggerNameBox m ()

Monad m => CanLog (NamedPureLogger m)

Methods

dispatchMessage :: LoggerName -> Severity -> Text -> NamedPureLogger m ()

Monad m => CanLog (PureLogger m)

Methods

dispatchMessage :: LoggerName -> Severity -> Text -> PureLogger m ()

CanLog m => CanLog (StateT s m)

Methods

dispatchMessage :: LoggerName -> Severity -> Text -> StateT s m ()

CanLog m => CanLog (StateT s m)

Methods

dispatchMessage :: LoggerName -> Severity -> Text -> StateT s m ()

CanLog m => CanLog (ExceptT s m)

Methods

dispatchMessage :: LoggerName -> Severity -> Text -> ExceptT s m ()

CanLog m => CanLog (ReaderT * r m)

Methods

dispatchMessage :: LoggerName -> Severity -> Text -> ReaderT * r m ()

(CanLog m, Monoid w) => CanLog (RWST r w s m)

Methods

dispatchMessage :: LoggerName -> Severity -> Text -> RWST r w s m ()

(CanLog m, Monoid w) => CanLog (RWST r w s m)

Methods

dispatchMessage :: LoggerName -> Severity -> Text -> RWST r w s m ()

type WithLogger m = (CanLog m, HasLoggerName m)

Type alias for constraints CanLog and HasLoggerName. We need two different type classes to support more flexible interface but in practice we usually use them both.

Logging functions

logDebug :: WithLogger m => Text -> m ()

Shortcut for logMessage to use according severity.

logError :: WithLogger m => Text -> m ()

Shortcut for logMessage to use according severity.

logInfo :: WithLogger m => Text -> m ()

Shortcut for logMessage to use according severity.

logNotice :: WithLogger m => Text -> m ()

Shortcut for logMessage to use according severity.

logWarning :: WithLogger m => Text -> m ()

Shortcut for logMessage to use according severity.

logMessage :: WithLogger m => Severity -> Text -> m ()

Logs message with specified severity using logger name in context.