System.Log.Heavy.Level

This module contains types and functions for log message severities.

Data types

data Level

Logging message severity level data type

Constructors

Level

Fields

• levelName :: Text

  Level name, like "debug" or "info"

• levelInt :: Int

  Integer level identifier. Comparation is based on these identifiers.

• levelToPriority :: Priority

  Syslog equivalent of this level.

Instances

Eq Level

Defined in System.Log.Heavy.Level

Methods

(==) :: Level -> Level -> Bool

(/=) :: Level -> Level -> Bool

Ord Level

Defined in System.Log.Heavy.Level

Methods

compare :: Level -> Level -> Ordering

(<) :: Level -> Level -> Bool

(<=) :: Level -> Level -> Bool

(>) :: Level -> Level -> Bool

(>=) :: Level -> Level -> Bool

max :: Level -> Level -> Level

min :: Level -> Level -> Level

Show Level

Defined in System.Log.Heavy.Level

Methods

showsPrec :: Int -> Level -> ShowS

show :: Level -> String

showList :: [Level] -> ShowS

Lift Level

Defined in System.Log.Heavy.TH

Methods

lift :: Level -> Q Exp

Formatable Level

Defined in System.Log.Heavy.Format

Methods

formatVar :: VarFormat -> Level -> Either String Builder

Utility functions

levelToLogLevel :: Level -> LogLevel

Conversion function

logLevelToLevel :: LogLevel -> Level

Convertion function. Note that LevelOther is translated to integer level 210 and Syslog's Alert priority, since in monad-logger semantics any LevelOther is more severe than LevelError.

parseLevel

Arguments

:: [Level]

List of recognized levels

-> Text

Level name to find

-> Maybe Level

Nothing if no match found

Detect Level from it's name. This function is not case-sensitive.

Standard severity levels

trace_level :: Level

TRACE level is supposed to be used for development-stage debugging. Has integer value of 600.

debug_level :: Level

DEBUG level is supposed to be used for debug logging that can be enabled on production. Has integer value of 500.

info_level :: Level

INFO level: some event occured. Has integer value of 400.

warn_level :: Level

WARN level: something went wrong, but for now it will not affect system's stability. Has integer value of 300.

error_level :: Level

ERROR level: something went wrong. Has integer value of 200.

fatal_level :: Level

FATAL level: something went terribly wrong, application is to be stopped. Has integer value of 100.

disable_logging :: Level

DISABLED level. This has integer identifier of 0, which is supposed to be less than any other level. This value can be used to disable logging at all.