add the files downloaded from the monad-logger-syslog hackage tarball

Author: dysinger

Setup.hs

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+import Distribution.Simple
+main = defaultMain

System/Log/MonadLogger/Syslog.hs

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+{-# LANGUAGE OverloadedStrings #-}
+module System.Log.MonadLogger.Syslog where
+
+import Control.Monad.IO.Class (MonadIO ())
+import Control.Monad.Logger
+import System.Posix.Syslog
+import Data.Text (unpack)
+import System.Log.FastLogger (LogStr, fromLogStr)
+import qualified Data.ByteString.Char8 as BS8
+
+runSyslogLoggingT :: MonadIO m => LoggingT m a -> m a
+runSyslogLoggingT = (`runLoggingT` syslogOutput)
+
+-- TODO: useSyslog allows giving a source name and should be more efficient
+-- But it assumes IO
+-- Perhaps should use mmorph to generalize IO to MonadIO
+{-
+runSyslogLoggingT :: MonadIO m => String -> LoggingT m a -> m a
+runSyslogLoggingT source action =
+  useSyslog source (runLoggingT action syslogOutput)
+-}
+
+
+syslogOutput :: Loc
+              -> LogSource
+              -> LogLevel
+              -> LogStr
+              -> IO ()
+syslogOutput l s level msg =
+    syslog (levelToPriority level) $
+        BS8.unpack $ fromLogStr $
+            defaultLogStr l s level msg
+
+
+levelToPriority :: LogLevel -> Priority
+levelToPriority LevelDebug = Debug
+levelToPriority LevelInfo  = Info
+levelToPriority LevelWarn  = Warning
+levelToPriority LevelError = Error
+levelToPriority (LevelOther level) =
+    case level of
+        "Emergency" -> Emergency
+        "Alert"     -> Alert
+        "Critical"  -> Critical
+        "Notice"    -> Notice
+        _ -> error $ "unknown log level: " ++ unpack level

monad-logger-syslog.cabal

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+name:                monad-logger-syslog
+version:             0.1.0.0
+synopsis:            rsyslog output for monad-logger
+description:         rsyslog output for monad-logger
+homepage:            https://github.com/docmunch/monad-logger-rsyslog
+license:             MIT
+license-file:        LICENSE
+author:              Greg Weber
+maintainer:          [email protected]
+category:            System
+build-type:          Simple
+extra-source-files:  README.md
+cabal-version:       >=1.10
+
+library
+  default-language:    Haskell2010
+  exposed-modules:     System.Log.MonadLogger.Syslog
+  ghc-options:        -Wall
+  build-depends:       base >=4.6 && <4.7
+                     , monad-logger >= 0.3.4.0
+                     , fast-logger >= 2.1.0
+                     , hsyslog
+                     , transformers
+                     , text
+                     , bytestring
+
+test-suite smoke
+  default-language:    Haskell2010
+
+  type: exitcode-stdio-1.0
+  hs-source-dirs: test
+  main-is: smoke.hs
+
+  build-depends: base, monad-logger, monad-logger-syslog, shelly

test/smoke.hs

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+{-# LANGUAGE OverloadedStrings #-}
+import Control.Monad.Logger
+import System.Log.MonadLogger.Syslog
+import Shelly
+
+main :: IO ()
+main = do
+    let logFile = "/var/log/syslog"
+    runSyslogLoggingT $ logDebugN "HELLO!"
+    shellyNoDir $
+        whenM (test_e logFile) $
+            cmd "tail" logFile