canteven-log (empty) → 0.2.0.0

raw patch · 4 files changed

+364/−0 lines, 4 filesdep +aesondep +basedep +canteven-configsetup-changed

Dependencies added: aeson, base, canteven-config, directory, filepath, hslogger, text, yaml

Files

• LICENSE +202/−0
• Setup.hs +2/−0
• canteven-log.cabal +35/−0
• src/Canteven/Log.hs +125/−0

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@@ -0,0 +1,2 @@+import Distribution.Simple+main = defaultMain

@@ -0,0 +1,35 @@+-- Initial canteven-log.cabal generated by cabal init.  For further +-- documentation, see http://haskell.org/cabal/users-guide/++name:                canteven-log+version:             0.2.0.0+synopsis:            A canteven way of setting up logging for your program.+-- description:         +homepage:            https://github.com/SumAll/haskell-canteven-log+license:             Apache-2.0+license-file:        LICENSE+author:              Rick Owens+maintainer:          rowens@sumall.com+-- copyright:           +-- category:            +build-type:          Simple+-- extra-source-files:  +cabal-version:       >=1.10++library+  exposed-modules:     +    Canteven.Log+  -- other-modules:       +  -- other-extensions:    +  build-depends:+    aeson,+    base >= 4 && < 5,+    canteven-config >= 1.0 && < 1.1,+    directory,+    filepath,+    hslogger,+    text,+    yaml+  hs-source-dirs:      src+  default-language:    Haskell2010+  ghc-options: -Wall

@@ -0,0 +1,125 @@+{-# LANGUAGE NamedFieldPuns, OverloadedStrings #-}+{- |+  This module provides a way (not the best way, just *a* way) to easily set up+  logging for your program without all the hassle. It uses a standard+  configuration (obtained using the @canteven-config@ package) to set up the+  @hslogger@ configuration. Maybe in the future we will use some kind of more+  general logging monad, but for now, there are no monads here.+-}+module Canteven.Log (+  setupLogging+) where++import Control.Applicative ((<$>), (<*>))+import Data.Aeson (Value(String, Object), (.:?), (.!=), (.:))+import Data.Yaml (FromJSON(parseJSON))+import System.Directory (createDirectoryIfMissing)+import System.FilePath (dropFileName)+import System.IO (stdout)+import System.Log (Priority(INFO, DEBUG))+import System.Log.Formatter (simpleLogFormatter)+import System.Log.Handler (setFormatter)+import System.Log.Handler.Simple (fileHandler, streamHandler)+import System.Log.Logger (updateGlobalLogger, setHandlers, setLevel)+import qualified Canteven.Config as Config (canteven)+import qualified Data.Text as T+++{- |+  Read the program configuration, using the @canteven-config@, and set+  up @hslogger@.+-}+setupLogging :: IO ()+setupLogging =+  installConfig =<< Config.canteven+++{- |+  Do all of the things that it takes to get logging set up the way we+  want it.+-}+installConfig :: LoggingConfig -> IO ()+installConfig LoggingConfig {logfile, level = LP level, loggers} = do+  fileHandlers <-+    case logfile of+      Nothing -> return []+      Just filename -> do+        createDirectoryIfMissing True (dropFileName filename)+        file <- tweak <$> fileHandler filename DEBUG+        return [file]++  console <- tweak <$> streamHandler stdout DEBUG+  let handlers = console:fileHandlers+  updateGlobalLogger "" (setLevel level . setHandlers handlers)+  sequence_ [+      updateGlobalLogger loggerName (setLevel loggerLevel) |+      LoggerDetails {loggerName, loggerLevel = LP loggerLevel} <- loggers+    ]+  where+    tweak h = setFormatter h (simpleLogFormatter logFormat)+    logFormat = "$prio [$tid] [$time] $loggername - $msg"+++data LoggingConfig =+  LoggingConfig {+    level :: LogPriority,+    logfile :: Maybe FilePath,+    loggers :: [LoggerDetails]+  }++instance FromJSON LoggingConfig where+  parseJSON (Object topLevel) = do+    mLogging <- topLevel .:? "logging"+    case mLogging of+      Nothing -> return defaultLogging+      Just logging -> LoggingConfig+        <$> logging .:? "level" .!= LP INFO+        <*> logging .:? "logfile"+        <*> logging .:? "loggers" .!= []++  parseJSON value =+    fail $ "Couldn't parse logging config from value " ++ show value+++{- |+  Don't bother with @data-default@. `LoggingConfig` is not exposed and+  the fewer dependencies the better.+-}+defaultLogging :: LoggingConfig+defaultLogging = LoggingConfig {+    level = LP INFO,+    logfile = Nothing,+    loggers = []+  }+++{- |+  A wrapper for Priority, so we can avoid orphan instances+-}+newtype LogPriority = LP Priority++instance FromJSON LogPriority where+  parseJSON (String s) = case reads (T.unpack s) of+    [(priority, "")] -> return (LP priority)+    _ -> fail $ "couldn't parse Priority from string " ++ show s+  parseJSON value = fail $ "Couldn't parse Priority from value " ++ show value+++{- |+  A way to set more fined-grained configuration for specific loggers.+-}+data LoggerDetails =+  LoggerDetails {+    loggerName :: String,+    loggerLevel :: LogPriority+  }++instance FromJSON LoggerDetails where+  parseJSON (Object details) = do+    loggerName <- details .: "logger"+    loggerLevel <- details .: "level"+    return LoggerDetails {loggerName, loggerLevel}+  parseJSON value =+    fail $ "Couldn't parse logger details from value " ++ show value++