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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,29 @@ | ||
| module Cardano.Launcher.Logging (traceHandle) where | ||
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|
||
| import Control.Monad.IO.Class | ||
| ( MonadIO (..) | ||
| ) | ||
| import Control.Tracer | ||
| ( Tracer | ||
| , traceWith | ||
| ) | ||
| import Data.Text | ||
| ( Text | ||
| ) | ||
| import Prelude | ||
| import System.IO | ||
| ( Handle | ||
| , hIsEOF | ||
| ) | ||
|
|
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| import qualified Data.Text.IO as T | ||
|
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| traceHandle :: MonadIO m => Tracer m Text -> Handle -> m () | ||
| traceHandle tr h = do | ||
| eof <- liftIO $ hIsEOF h | ||
| if eof | ||
| then pure () | ||
| else do | ||
| line <- liftIO $ T.hGetLine h | ||
| traceWith tr line | ||
| traceHandle tr h |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,85 @@ | ||
| {-# LANGUAGE OverloadedStrings #-} | ||
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| module Cardano.Launcher.LoggingSpec (spec) where | ||
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| import Prelude | ||
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| import Cardano.Launcher | ||
| ( Command (Command) | ||
| , ProcessRun (ProcessRun) | ||
| , StdStream (CreatePipe, NoStream) | ||
| , withBackendProcess | ||
| ) | ||
| import Cardano.Launcher.Logging | ||
| ( traceHandle | ||
| ) | ||
| import Control.Monad | ||
| ( forM_ | ||
| ) | ||
| import Control.Tracer | ||
| ( Tracer (..) | ||
| , nullTracer | ||
| ) | ||
| import Data.Functor.Contravariant | ||
| ( (>$<) | ||
| ) | ||
| import Data.IORef | ||
| ( modifyIORef | ||
| , newIORef | ||
| , readIORef | ||
| ) | ||
| import Data.Text | ||
| ( Text | ||
| ) | ||
| import System.IO | ||
| ( SeekMode (..) | ||
| , hSeek | ||
| ) | ||
| import Test.Hspec | ||
| ( Spec | ||
| , describe | ||
| , it | ||
| , shouldBe | ||
| , shouldReturn | ||
| ) | ||
| import UnliftIO | ||
| ( withSystemTempFile | ||
| ) | ||
|
|
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| import qualified Data.Text.IO as T | ||
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| holdTrace :: IO (Tracer IO Text, IO [Text]) | ||
| holdTrace = do | ||
| ref <- newIORef [] | ||
| let tracer = Tracer $ \line -> modifyIORef ref (line :) | ||
| pure (tracer, reverse <$> readIORef ref) | ||
|
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| prepend :: Text -> Text -> Text | ||
| prepend prefix = ((prefix <> ": ") <>) | ||
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| spec :: Spec | ||
| spec = do | ||
| describe "traceHandle" $ do | ||
| it "traces lines from a handle" $ do | ||
| let ls = ["line 1", "line 2", "line 3"] | ||
| withSystemTempFile "traceHandle" $ \_ handle -> do | ||
| forM_ ls $ T.hPutStrLn handle | ||
| hSeek handle AbsoluteSeek 0 | ||
| (tracer, readTrace) <- holdTrace | ||
| traceHandle (("traced:" <>) >$< tracer) handle | ||
| readTrace `shouldReturn` (("traced:" <>) <$> ls) | ||
| it "traces output of a process" $ do | ||
| let c = Command | ||
| "echo" | ||
| ["cwd"] | ||
| (pure ()) | ||
| NoStream | ||
| CreatePipe | ||
| run _ (Just handle) _ _ = do | ||
| (tracer, readTrace) <- holdTrace | ||
| traceHandle (prepend "stdout" >$< tracer) handle | ||
| readTrace `shouldReturn` prepend "stdout" <$> ["cwd"] | ||
| run _ _ _ _ = fail "no stdout" | ||
| r <- withBackendProcess nullTracer c $ ProcessRun run | ||
| r `shouldBe` Right () | ||
| pure () |