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{-# LANGUAGE TemplateHaskell #-}
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{-| Implementation of the Ganeti logging functionality.
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This currently lacks the following (FIXME):
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- syslog logging
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- handling of the three-state syslog yes/no/only
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- log file reopening
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Note that this requires the hslogger library version 1.1 and above.
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{-
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Copyright (C) 2011 Google Inc.
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Copyright (C) 2011, 2012 Google Inc.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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, logCritical
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, logAlert
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, logEmergency
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, SyslogUsage(..)
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, syslogUsageToRaw
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, syslogUsageFromRaw
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) where
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import Control.Monad (when)
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import System.Log.Logger
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import System.Log.Handler.Simple
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import System.Log.Handler (setFormatter)
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import System.Log.Handler.Syslog
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import System.Log.Handler (setFormatter, LogHandler)
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import System.Log.Formatter
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import System.IO
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import Ganeti.THH
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import qualified Ganeti.Constants as C
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-- | Syslog usage type.
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$(declareSADT "SyslogUsage"
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[ ("SyslogNo", 'C.syslogNo)
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, ("SyslogYes", 'C.syslogYes)
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, ("SyslogOnly", 'C.syslogOnly)
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])
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-- | Builds the log formatter.
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logFormatter :: String -- ^ Program
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-> Bool -- ^ Multithreaded
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]
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in simpleLogFormatter $ concat parts
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-- | Helper to open and set the formatter on a log if enabled by a
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-- given condition, otherwise returning an empty list.
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openFormattedHandler :: (LogHandler a) => Bool
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-> LogFormatter a -> IO a -> IO [a]
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openFormattedHandler False _ _ = return []
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openFormattedHandler True fmt opener = do
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handler <- opener
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return [setFormatter handler fmt]
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-- | Sets up the logging configuration.
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setupLogging :: String -- ^ Log file
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-> String -- ^ Program name
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-> Bool -- ^ Debug level
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-> Bool -- ^ Log to stderr
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-> Bool -- ^ Log to console
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-> SyslogUsage -- ^ Syslog usage
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-> IO ()
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setupLogging logf program debug stderr_logging console = do
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setupLogging logf program debug stderr_logging console syslog = do
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let level = if debug then DEBUG else INFO
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destf = if console then C.devConsole else logf
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fmt = logFormatter program False False
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updateGlobalLogger rootLoggerName (setLevel level)
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stderr_handlers <- if stderr_logging
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then do
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stderr_handler <- streamHandler stderr level
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return [setFormatter stderr_handler fmt]
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else return []
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file_handler <- fileHandler destf level
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let handlers = setFormatter file_handler fmt:stderr_handlers
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stderr_handlers <- openFormattedHandler stderr_logging fmt $
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streamHandler stderr level
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file_handlers <- openFormattedHandler (syslog /= SyslogOnly) fmt $
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fileHandler destf level
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let handlers = concat [file_handlers, stderr_handlers]
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updateGlobalLogger rootLoggerName $ setHandlers handlers
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-- syslog handler is special (another type, still instance of the
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-- typeclass, and has a built-in formatter), so we can't pass it in
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-- the above list
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when (syslog /= SyslogNo) $ do
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syslog_handler <- openlog program [PID] DAEMON INFO
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updateGlobalLogger rootLoggerName $ addHandler syslog_handler
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-- * Logging function aliases
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