System.Logging.Facade

This module is intended to be imported qualified:

import qualified System.Logging.Facade as Log

Producing log messages

log :: Logging m => LogLevel -> String -> m ()

Produce a log message with specified log level.

trace :: Logging m => String -> m ()

Produce a log message with log level TRACE.

debug :: Logging m => String -> m ()

Produce a log message with log level DEBUG.

info :: Logging m => String -> m ()

Produce a log message with log level INFO.

warn :: Logging m => String -> m ()

Produce a log message with log level WARN.

error :: Logging m => String -> m ()

Produce a log message with log level ERROR.

Types

class Monad m => Logging m

A type class for monads with logging support

Minimal complete definition

consumeLogRecord

Instances

Logging IO

Log messages that are produced in the IO monad are consumed by the global LogSink.

Logging m => Logging (MaybeT m)

Logging m => Logging (ListT m)

Logging m => Logging (IdentityT m)

(Monoid w, Logging m) => Logging (WriterT w m)

(Monoid w, Logging m) => Logging (WriterT w m)

(Error e, Logging m) => Logging (ErrorT e m)

Logging m => Logging (ExceptT e m)

Logging m => Logging (StateT s m)

Logging m => Logging (StateT s m)

Logging m => Logging (ReaderT r m)

Logging m => Logging (ContT r m)

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

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

data LogLevel

Constructors

TRACE

DEBUG

INFO

WARN

ERROR

Instances

Bounded LogLevel

Enum LogLevel

Eq LogLevel

Ord LogLevel

Show LogLevel