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{-# LANGUAGE FlexibleContexts #-}
{-# LANGUAGE LambdaCase #-}
{-# LANGUAGE MultiWayIf #-}
{-# LANGUAGE OverloadedStrings #-}
{-# LANGUAGE RecordWildCards #-}
module Flameshot.Internal.Process (Callbacks(..),run,runAway) where
import Control.Concurrent (forkIO,threadDelay)
import Control.Concurrent.Async (race)
import Control.Exception
import Control.Monad.Extended (untilM_,unless)
import Data.ByteString (ByteString)
import qualified Data.ByteString as BS
import Data.Text (Text)
import qualified Data.Text.IO as T
import System.Exit
import System.IO (BufferMode(LineBuffering),hSetBuffering)
import System.IO (Handle,hClose,hIsEOF)
import System.IO.Error (catchIOError,isDoesNotExistError)
import System.Process
import System.Posix.Process (getProcessGroupIDOf)
import System.Posix.Signals (Signal,signalProcessGroup,killProcess)
import System.Posix.Types (ProcessGroupID)
data Callbacks = Callbacks
{ onOutLine :: Pid -> Text -> IO ()
, onErrLine :: Pid -> Text -> IO ()
, onError :: Pid -> SomeException -> IO ()
, onExit :: Pid -> ExitCode -> IO ()
, onStart :: Pid -> IO ()
}
instance Semigroup Callbacks where
a <> b =
Callbacks
{ onOutLine = \pid s -> do
onOutLine a pid s
onOutLine b pid s
, onErrLine = \pid s -> do
onErrLine a pid s
onErrLine b pid s
, onError = \pid err -> do
onError a pid err
onError b pid err
, onExit = \pid status -> do
onExit a pid status
onExit b pid status
, onStart = \pid -> do
onStart a pid
onStart b pid
}
instance Monoid Callbacks where
mempty =
Callbacks
{ onOutLine = \_pid _s -> return ()
, onErrLine = \_pid _s -> return ()
, onError = \_pid _err -> return ()
, onExit = \_pid _status -> return ()
, onStart = \_pid -> return ()
}
run :: FilePath
-> [String]
-> Maybe FilePath
-> Maybe [(String, String)]
-> ByteString
-> Maybe Int
-> Callbacks
-> IO ()
run path args cwd env input hTimeout Callbacks{..} =
f `catch` onError (-1)
where
f = withCreateProcess p $ \(Just inh) (Just outh) (Just errh) ph -> do
Just pid <- getPid ph
pgid <- getProcessGroupIDOf pid
onStart pid
mapM_ forkIO [
BS.hPutStr inh input `finally` hClose inh,
hWithLines outh (onOutLine pid),
hWithLines errh (onErrLine pid)
]
case hTimeout of
Just time ->
race (threadDelay time) (waitForProcess ph) >>= \case
Left () -> onError pid (SomeException (ErrorCall "timeout"))
Right code -> onExit pid code
Nothing ->
waitForProcess ph >>= onExit pid
killProcessGroup pgid
p = (proc path args)
{ cwd = cwd
, env = env
, std_in = CreatePipe
, std_out = CreatePipe
, std_err = CreatePipe
, close_fds = True
, create_group = True
, new_session = True
}
runAway :: FilePath
-> [String]
-> Maybe FilePath
-> Maybe [(String, String)]
-> ByteString
-> Maybe Int
-> Callbacks
-> IO ()
runAway path args cwd env input hTimeout Callbacks{..} =
f `catch` onError (-1)
where
f = do
(Just inh, Just outh, Just errh, ph) <- createProcess p
Just pid <- getPid ph
onStart pid
mapM_ forkIO [
BS.hPutStr inh input `finally` hClose inh,
hWithLines outh (onOutLine pid),
hWithLines errh (onErrLine pid)
]
case hTimeout of
Just time ->
race (threadDelay time) (waitForProcess ph) >>= \case
Left () -> onError pid (SomeException (ErrorCall "timeout"))
Right code -> onExit pid code
Nothing ->
waitForProcess ph >>= onExit pid
p = (proc path args)
{ cwd = cwd
, env = env
, std_in = CreatePipe
, std_out = CreatePipe
, std_err = CreatePipe
, close_fds = True
, create_group = True
, new_session = True
}
killProcessGroup :: ProcessGroupID -> IO ()
killProcessGroup = signalProcessGroup' killProcess
signalProcessGroup' :: Signal -> ProcessGroupID -> IO ()
signalProcessGroup' sig pgid =
catchIOError
(signalProcessGroup sig pgid)
(\e -> unless (isDoesNotExistError e) $ ioError e)
hWithLines :: Handle -> (Text -> IO ()) -> IO ()
hWithLines h f = do
hSetBuffering h LineBuffering
untilM_ (hIsEOF h) (T.hGetLine h >>= f) `finally` hClose h
|
