Safe Haskell	None
Language	Haskell2010

System.Logging.Facade

Contents

Producing log messages
Types

Description

This module is intended to be imported qualified:

import qualified System.Logging.Facade as Log

Synopsis

log :: (HasCallStack, Logging m) => LogLevel -> String -> m ()
trace :: (HasCallStack, Logging m) => String -> m ()
debug :: (HasCallStack, Logging m) => String -> m ()
info :: (HasCallStack, Logging m) => String -> m ()
warn :: (HasCallStack, Logging m) => String -> m ()
error :: (HasCallStack, Logging m) => String -> m ()
class Monad m => Logging m
data LogLevel
- = TRACE
- | DEBUG
- | INFO
- | WARN
- | ERROR

Producing log messages

log :: (HasCallStack, Logging m) => LogLevel -> String -> m () Source #

Produce a log message with specified log level.

trace :: (HasCallStack, Logging m) => String -> m () Source #

Produce a log message with log level TRACE.

debug :: (HasCallStack, Logging m) => String -> m () Source #

Produce a log message with log level DEBUG.

info :: (HasCallStack, Logging m) => String -> m () Source #

Produce a log message with log level INFO.

warn :: (HasCallStack, Logging m) => String -> m () Source #

Produce a log message with log level WARN.

error :: (HasCallStack, Logging m) => String -> m () Source #

Produce a log message with log level ERROR.

Types

class Monad m => Logging m Source #

A type class for monads with logging support

Minimal complete definition

consumeLogRecord

Instances

Instances details

Logging IO Source #	Log messages that are produced in the `IO` monad are consumed by the global `LogSink`.
Instance details Defined in System.Logging.Facade.Class Methods consumeLogRecord :: LogRecord -> IO () Source #
Logging m => Logging (MaybeT m) Source #
Instance details Defined in System.Logging.Facade.Class Methods consumeLogRecord :: LogRecord -> MaybeT m () Source #
Logging m => Logging (ListT m) Source #
Instance details Defined in System.Logging.Facade.Class Methods consumeLogRecord :: LogRecord -> ListT m () Source #
(Monoid w, Logging m) => Logging (WriterT w m) Source #
Instance details Defined in System.Logging.Facade.Class Methods consumeLogRecord :: LogRecord -> WriterT w m () Source #
(Monoid w, Logging m) => Logging (WriterT w m) Source #
Instance details Defined in System.Logging.Facade.Class Methods consumeLogRecord :: LogRecord -> WriterT w m () Source #
Logging m => Logging (StateT s m) Source #
Instance details Defined in System.Logging.Facade.Class Methods consumeLogRecord :: LogRecord -> StateT s m () Source #
Logging m => Logging (StateT s m) Source #
Instance details Defined in System.Logging.Facade.Class Methods consumeLogRecord :: LogRecord -> StateT s m () Source #
Logging m => Logging (ReaderT r m) Source #
Instance details Defined in System.Logging.Facade.Class Methods consumeLogRecord :: LogRecord -> ReaderT r m () Source #
Logging m => Logging (IdentityT m) Source #
Instance details Defined in System.Logging.Facade.Class Methods consumeLogRecord :: LogRecord -> IdentityT m () Source #
Logging m => Logging (ExceptT e m) Source #
Instance details Defined in System.Logging.Facade.Class Methods consumeLogRecord :: LogRecord -> ExceptT e m () Source #
(Error e, Logging m) => Logging (ErrorT e m) Source #
Instance details Defined in System.Logging.Facade.Class Methods consumeLogRecord :: LogRecord -> ErrorT e m () Source #
Logging m => Logging (ContT r m) Source #
Instance details Defined in System.Logging.Facade.Class Methods consumeLogRecord :: LogRecord -> ContT r m () Source #
(Monoid w, Logging m) => Logging (RWST r w s m) Source #
Instance details Defined in System.Logging.Facade.Class Methods consumeLogRecord :: LogRecord -> RWST r w s m () Source #
(Monoid w, Logging m) => Logging (RWST r w s m) Source #
Instance details Defined in System.Logging.Facade.Class Methods consumeLogRecord :: LogRecord -> RWST r w s m () Source #

data LogLevel Source #

Constructors

TRACE
DEBUG
INFO
WARN
ERROR

Instances

Instances details

Bounded LogLevel Source #
Instance details Defined in System.Logging.Facade.Types Methods minBound :: LogLevel # maxBound :: LogLevel #
Enum LogLevel Source #
Instance details Defined in System.Logging.Facade.Types Methods succ :: LogLevel -> LogLevel # pred :: LogLevel -> LogLevel # toEnum :: Int -> LogLevel # fromEnum :: LogLevel -> Int # enumFrom :: LogLevel -> [LogLevel] # enumFromThen :: LogLevel -> LogLevel -> [LogLevel] # enumFromTo :: LogLevel -> LogLevel -> [LogLevel] # enumFromThenTo :: LogLevel -> LogLevel -> LogLevel -> [LogLevel] #
Eq LogLevel Source #
Instance details Defined in System.Logging.Facade.Types Methods (==) :: LogLevel -> LogLevel -> Bool # (/=) :: LogLevel -> LogLevel -> Bool #
Ord LogLevel Source #
Instance details Defined in System.Logging.Facade.Types Methods compare :: LogLevel -> LogLevel -> Ordering # (<) :: LogLevel -> LogLevel -> Bool # (<=) :: LogLevel -> LogLevel -> Bool # (>) :: LogLevel -> LogLevel -> Bool # (>=) :: LogLevel -> LogLevel -> Bool # max :: LogLevel -> LogLevel -> LogLevel # min :: LogLevel -> LogLevel -> LogLevel #
Read LogLevel Source #
Instance details Defined in System.Logging.Facade.Types Methods readsPrec :: Int -> ReadS LogLevel # readList :: ReadS [LogLevel] # readPrec :: ReadPrec LogLevel # readListPrec :: ReadPrec [LogLevel] #
Show LogLevel Source #
Instance details Defined in System.Logging.Facade.Types Methods showsPrec :: Int -> LogLevel -> ShowS # show :: LogLevel -> String # showList :: [LogLevel] -> ShowS #