Control.Eff.LogWriter.Console

This helps to setup logging to standard ouput.

Documentation

withConsoleLogWriter :: (LogsTo IO e, Lifted IO e) => Eff e a -> Eff e a

Enable logging to standard output using the consoleLogWriter.

Log messages are rendered using renderLogMessageConsoleLog.

Example:

exampleWithConsoleLogWriter :: IO ()
exampleWithConsoleLogWriter =
    runLift
  $ withSomeLogging @IO
  $ withConsoleLogWriter
  $ logInfo "Oh, hi there"

withConsoleLogging

Arguments

:: Lifted IO e

=> Text

The default application name to put into the lmAppName field.

-> Facility

The default RFC-5424 facility to put into the lmFacility field.

-> LogPredicate

The inital predicate for log messages, there are some pre-defined in Control.Eff.Log.Message

-> Eff (Logs ': (LogWriterReader IO ': e)) a

-> Eff e a

Enable logging to standard output using the consoleLogWriter, with some LogMessage fields preset as in withIoLogging.

Log messages are rendered using renderLogMessageConsoleLog.

Example:

exampleWithConsoleLogging :: IO ()
exampleWithConsoleLogging =
    runLift
  $ withConsoleLogging "my-app" local7 allLogMessages
  $ logInfo "Oh, hi there"

To vary the LogWriter use withIoLogging.

consoleLogWriter :: LogWriter IO

Write LogMessages to standard output, formatted with printLogMessage.

It uses stdoutLogWriter with renderLogMessageConsoleLog.

stdoutLogWriter :: LogMessageRenderer Text -> LogWriter IO

A LogWriter that uses a LogMessageRenderer to render, and putStrLn to print it.