fused-effects-logger (empty) → 0.0.1.1

raw patch · 9 files changed

+1079/−0 lines, 9 filesdep +basedep +bytestringdep +directory

Dependencies added: base, bytestring, directory, filepath, fused-effects, fused-effects-logger, ghc-prim, hspec, monad-logger

Files

• LICENSE +674/−0
• README.md +40/−0
• fused-effects-logger.cabal +70/−0
• src/Control/Carrier/Logger/IO.hs +93/−0
• src/Control/Carrier/Logger/Writer.hs +54/−0
• src/Control/Effect/Logger.hs +37/−0
• test/Control/Carrier/Logger/IOSpec.hs +39/−0
• test/Control/Carrier/Logger/WriterSpec.hs +70/−0
• test/Spec.hs +2/−0

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If not, see <https://www.gnu.org/licenses/>.++Also add information on how to contact you by electronic and paper mail.++  If the program does terminal interaction, make it output a short+notice like this when it starts in an interactive mode:++    <program>  Copyright (C) <year>  <name of author>+    This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.+    This is free software, and you are welcome to redistribute it+    under certain conditions; type `show c' for details.++The hypothetical commands `show w' and `show c' should show the appropriate+parts of the General Public License.  Of course, your program's commands+might be different; for a GUI interface, you would use an "about box".++  You should also get your employer (if you work as a programmer) or school,+if any, to sign a "copyright disclaimer" for the program, if necessary.+For more information on this, and how to apply and follow the GNU GPL, see+<https://www.gnu.org/licenses/>.++  The GNU General Public License does not permit incorporating your program+into proprietary programs.  If your program is a subroutine library, you+may consider it more useful to permit linking proprietary applications with+the library.  If this is what you want to do, use the GNU Lesser General+Public License instead of this License.  But first, please read+<https://www.gnu.org/licenses/why-not-lgpl.html>.

@@ -0,0 +1,40 @@+# fused-effects-logger++A logger effect for the+[`fused-effects`](https://github.com/fused-effects/fused-effects) library, based+on the [`monad-logger`](https://github.com/snoyberg/monad-logger) API.++# Usage+In addition to `fused-effects-logger`, you most probably want to add+`monad-logger` as well in order to use its logging functions.++Here is a simple example to start running a program that logs to `stderr`:++```haskell+{-# LANGUAGE OverloadedStrings #-}+{-# LANGUAGE TemplateHaskell #-}++module Main (main) where++import Control.Carrier.Lift (runM)+import Control.Carrier.Logger.IO (runStderrLoggerIO)+import Control.Effect.Lift (sendM)+import Control.Monad.Logger (logInfo)++main :: IO ()+main = runM . runStderrLoggerIO $ do+  $(logInfo) "hello from fused-effects-logger"+  sendM (print 42)+```++It should produce the output:++```+[Info] hello from fused-effects-logger @(test-logger-0.1.0.0-KTuyx50rxPBAwC1EHp8UuV-test-logger-exe:Main app/Main.hs:13:4)+42+```++# Contributing++Please follow the process describe in [`RELEASE.md`](./RELEASE.md) to release+new versions to Hackage.

@@ -0,0 +1,70 @@+cabal-version: 1.12++-- This file has been generated from package.yaml by hpack version 0.37.0.+--+-- see: https://github.com/sol/hpack++name:           fused-effects-logger+version:        0.0.1.1+synopsis:       Logger effect for the `fused-effects` library+description:    A logger effect for the `fused-effects` library based on the `monad-logger` api.+category:       Effect+homepage:       https://github.com/haskell-github-trust/fused-effects-logger+bug-reports:    https://github.com/haskell-github-trust/fused-effects-logger/issues+author:         drlkf+maintainer:     drlkf@drlkf.net+copyright:      2025 drlkf+license:        GPL-3+license-file:   LICENSE+build-type:     Simple+tested-with:+    GHC == 9.10+  , GHC == 9.8+  , GHC == 9.6+extra-source-files:+    README.md++source-repository head+  type: git+  location: https://github.com/haskell-github-trust/fused-effects-logger++library+  exposed-modules:+      Control.Carrier.Logger.IO+      Control.Carrier.Logger.Writer+      Control.Effect.Logger+  other-modules:+      Paths_fused_effects_logger+  hs-source-dirs:+      src+  ghc-options: -Wall -Wcompat -Widentities -Wincomplete-record-updates -Wincomplete-uni-patterns -Wmissing-export-lists -Wmissing-home-modules -Wpartial-fields -Wredundant-constraints+  build-depends:+      base >=4.7 && <5+    , bytestring >=0.12 && <1+    , fused-effects >=1.1 && <2+    , monad-logger >=0.3 && <1+  default-language: Haskell2010++test-suite fused-effects-logger-test+  type: exitcode-stdio-1.0+  main-is: Spec.hs+  other-modules:+      Control.Carrier.Logger.IOSpec+      Control.Carrier.Logger.WriterSpec+      Paths_fused_effects_logger+  hs-source-dirs:+      test+  ghc-options: -Wall -Wcompat -Widentities -Wincomplete-record-updates -Wincomplete-uni-patterns -Wmissing-export-lists -Wmissing-home-modules -Wpartial-fields -Wredundant-constraints -threaded -rtsopts -with-rtsopts=-N+  build-tool-depends:+      hspec-discover:hspec-discover+  build-depends:+      base >=4.7 && <5+    , bytestring >=0.12 && <1+    , directory+    , filepath+    , fused-effects >=1.1 && <2+    , fused-effects-logger+    , ghc-prim+    , hspec+    , monad-logger >=0.3 && <1+  default-language: Haskell2010

@@ -0,0 +1,93 @@+{-# LANGUAGE FlexibleInstances #-}+{-# LANGUAGE GADTs #-}+{-# LANGUAGE GeneralizedNewtypeDeriving #-}+{-# LANGUAGE MultiParamTypeClasses #-}+{-# LANGUAGE RankNTypes #-}+{-# LANGUAGE TypeApplications #-}+{-# LANGUAGE TypeOperators #-}+{-# LANGUAGE UndecidableInstances #-}++-- | An IO carrier for the 'Logger' effect that writes logs to a 'Handle'+-- selected by the provided function.+module Control.Carrier.Logger.IO (+  LoggerIOC (LoggerIOC),++  -- * Helpers+  HandleSelector,+  singleHandle,++  -- * Carrier implementation+  runLoggerIO,+  runStdoutLoggerIO,+  runStderrLoggerIO,+) where++import Control.Algebra (Algebra (..), (:+:) (..))+import Control.Carrier.Reader (ReaderC, runReader)+import Control.Effect.Logger (Logger (..))+import Control.Effect.Reader (ask)+import Control.Monad.IO.Class (MonadIO (..))+import Control.Monad.Logger (+  Loc,+  LogLevel,+  LogSource,+  LogStr,+  ToLogStr (..),+  defaultLogStr,+  fromLogStr,+ )+import qualified Data.ByteString.Char8 as B (hPutStr)+import System.IO (Handle, stderr, stdout)++-- | Algebra for a simple IO logger. The inner function allows for selecting a+-- 'Handle' according to something like 'LogLevel'.+newtype LoggerIOC f m a = LoggerIOC+  { runLoggerIOC :: ReaderC f m a+  }+  deriving (Applicative, Functor, Monad, MonadIO)++type HandleSelector = Loc -> LogSource -> LogLevel -> LogStr -> Handle++-- | Helper to run IO loggers by writing to the same 'Handle' every time.+singleHandle+  :: Handle+  -> HandleSelector+singleHandle h _ _ _ _ = h++instance+  forall sig m+   . ( Algebra sig m+     , MonadIO m+     )+  => Algebra (Logger :+: sig) (LoggerIOC HandleSelector m)+  where+  alg hdl sig ctx = case sig of+    L (LoggerLog loc src lvl msg) -> LoggerIOC $ do+      f <- ask+      ctx+        <$ liftIO+          ( B.hPutStr+              (f loc src lvl (toLogStr msg))+              (fromLogStr (defaultLogStr loc src lvl (toLogStr msg)))+          )+    R other -> LoggerIOC (alg (runLoggerIOC . hdl) (R other) ctx)++-- | Run logger, writing to a 'Handle' selected by a function @f@.+runLoggerIO+  :: HandleSelector+  -- ^ @f@+  -> LoggerIOC HandleSelector m a+  -> m a+runLoggerIO f = runReader f . runLoggerIOC++-- | Run logger, writing everything to 'stdout'.+runStdoutLoggerIO+  :: LoggerIOC HandleSelector m a+  -> m a+runStdoutLoggerIO = runLoggerIO (singleHandle stdout)++-- | Run logger, writing everything to 'stderr'.+runStderrLoggerIO+  :: LoggerIOC HandleSelector m a+  -> m a+runStderrLoggerIO = runLoggerIO (singleHandle stderr)

@@ -0,0 +1,54 @@+{-# LANGUAGE FlexibleInstances #-}+{-# LANGUAGE GADTs #-}+{-# LANGUAGE GeneralizedNewtypeDeriving #-}+{-# LANGUAGE MultiParamTypeClasses #-}+{-# LANGUAGE RankNTypes #-}+{-# LANGUAGE ScopedTypeVariables #-}+{-# LANGUAGE TypeOperators #-}+{-# LANGUAGE UndecidableInstances #-}++-- | A pure carrier for the 'Logger' effect, using an underlying 'Writer'+-- effect.+--+-- >>> length (fst (run (runLoggerW (logDebugN "1" >> logDebugN "2" >> logWarnN "3"))))+-- 3+module Control.Carrier.Logger.Writer (+  LoggerWriterC (..),+  runLoggerW,+) where++import Control.Algebra (Algebra (..), (:+:) (..))+import Control.Carrier.Writer.Strict (WriterC, runWriter, tell)+import Control.Effect.Logger (Logger (..))+import Control.Monad.IO.Class (MonadIO (..))+import Control.Monad.Logger (+  LogLine,+  ToLogStr (..),+ )++-- | Reinterpreter from logger to writer. The underlying 'Writer' is always+-- 'Control.Carrier.Writer.Strict'.+newtype LoggerWriterC w m a = LoggerWriterC+  { runLoggerWriterC :: WriterC (w LogLine) m a+  }+  deriving (Applicative, Functor, Monad, MonadIO)++instance+  forall sig w m+   . ( Algebra sig m+     , Applicative w+     , Monoid (w LogLine)+     )+  => Algebra (Logger :+: sig) (LoggerWriterC w m)+  where+  alg hdl sig ctx = case sig of+    L (LoggerLog loc src lvl msg) ->+      ctx <$ LoggerWriterC (tell (pure (loc, src, lvl, toLogStr msg) :: w LogLine))+    R other ->+      LoggerWriterC (alg (runLoggerWriterC . hdl) (R other) ctx)++runLoggerW+  :: Monoid (w LogLine)+  => LoggerWriterC w m a+  -> m (w LogLine, a)+runLoggerW = runWriter . runLoggerWriterC

@@ -0,0 +1,37 @@+{-# LANGUAGE FlexibleInstances #-}+{-# LANGUAGE GADTs #-}+{-# LANGUAGE KindSignatures #-}+{-# LANGUAGE UndecidableInstances #-}+{-# OPTIONS_GHC -Wno-orphans #-}++-- | A simple logger effect that takes all the information a 'MonadLogger' monad+-- would take. Use the logging functions of 'MonadLogger' to log things the way+-- you want, as there are many options there (TH or non-TH).+module Control.Effect.Logger (+  Logger (..),+) where++import Control.Effect.Labelled (Has, send)+import Control.Monad.Logger (+  Loc,+  LogLevel,+  LogSource,+  MonadLogger (..),+  ToLogStr (..),+ )+import Data.Kind (Type)++data Logger (m :: Type -> Type) k where+  -- | See 'monadLoggerLog'.+  LoggerLog+    :: ToLogStr msg+    => Loc+    -> LogSource+    -> LogLevel+    -> msg+    -> Logger m ()++-- | Unfortunately, we need to implement the 'MonadLogger' instance as an orphan+-- in order to be able to use the same interface as 'MonadLogger'.+instance (Has Logger sig m, Monad m) => MonadLogger m where+  monadLoggerLog loc src lvl msg = send (LoggerLog loc src lvl msg)

@@ -0,0 +1,39 @@+{-# LANGUAGE OverloadedStrings #-}+{-# LANGUAGE TypeApplications #-}++module Control.Carrier.Logger.IOSpec (+  spec,+) where++import Control.Exception (try, IOException)+import Control.Carrier.Lift (runM)+import Control.Carrier.Logger.IO (runLoggerIO, singleHandle)+import Control.Monad.Logger (logDebugN, logInfoN, logWarnN)+import System.Directory (removePathForcibly)+import System.IO (hClose, openTempFile)+import Test.Hspec (Spec, describe, it, shouldReturn)++spec :: Spec+spec = do+  let runTestLogger action = do+        (fp, h) <- openTempFile "." "LoggerIOC.log"+        _ <- runM (runLoggerIO (singleHandle h) action)+        hClose h+        readFile fp <* (try @IOException (removePathForcibly fp))++  describe "LoggerIOC" $ do+    it "no log" $ do+      runTestLogger (pure ()) `shouldReturn` ""++    it "3 logs" $ do+      let action = do+            logDebugN "1"+            logInfoN "2"+            logWarnN "3"+          logLines =+            [ "[Debug] 1"+            , "[Info] 2"+            , "[Warn] 3"+            ]++      lines <$> runTestLogger action `shouldReturn` logLines

@@ -0,0 +1,70 @@+{-# LANGUAGE OverloadedStrings #-}+{-# LANGUAGE TemplateHaskell #-}++module Control.Carrier.Logger.WriterSpec (+  spec,+) where++import Control.Carrier.Interpret (run)+import Control.Carrier.Logger.Writer (runLoggerW)+import Control.Monad (forM_)+import Control.Monad.Logger (+  Loc (..),+  LogLevel (..),+  LogLine,+  defaultLoc,+  logDebugN,+  logDebugS,+  logInfoN,+  logInfoS,+  logWarnN,+  logWarnS,+ )+import System.FilePath ((<.>), (</>))+import Test.Hspec (Spec, context, describe, it, shouldBe, shouldContain, shouldNotBe)++spec :: Spec+spec = do+  describe "LoggerWriterC" $ do+    context "non-TH" $ do+      it "no log" $+        run (runLoggerW (pure ())) `shouldBe` ([], ())++      it "3 logs" $ do+        let action = do+              logDebugN "1"+              logInfoN "2"+              logWarnN "3"+            logLines =+              [ (defaultLoc, "", LevelDebug, "1")+              , (defaultLoc, "", LevelInfo, "2")+              , (defaultLoc, "", LevelWarn, "3")+              ]++        run (runLoggerW action) `shouldBe` (logLines, ())++    it "TH" $ do+      let action =+            do+              $logDebugS "test" "1"+              $logInfoS "test" "2"+              $logWarnS "test" "3"+          expected =+            [ (LevelDebug, "1")+            , (LevelInfo, "2")+            , (LevelWarn, "3")+            ]+          results = run (runLoggerW action)++      length (fst results) `shouldBe` 3+      forM_ (zip (fst results :: [LogLine]) expected) $+        \((loc, src, lvl, msg), (expLvl, expMsg)) -> do+          loc_filename loc+            `shouldBe` "test" </> "Control" </> "Carrier" </> "Logger" </> "WriterSpec" <.> "hs"+          loc_package loc `shouldContain` "fused-effects-logger"+          loc_module loc `shouldBe` "Control.Carrier.Logger.WriterSpec"+          loc_start loc `shouldNotBe` (0, 0)+          loc_end loc `shouldNotBe` (0, 0)+          src `shouldBe` "test"+          lvl `shouldBe` expLvl+          msg `shouldBe` expMsg

@@ -0,0 +1,2 @@+{-# OPTIONS_GHC -Wno-missing-export-lists #-}+{-# OPTIONS_GHC -F -pgmF hspec-discover #-}