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{-# LANGUAGE FlexibleContexts #-}
{-# LANGUAGE LambdaCase #-}
{-# LANGUAGE MultiWayIf #-}
{-# LANGUAGE OverloadedStrings #-}
{-# LANGUAGE RecordWildCards #-}
module Reaktor.Plugins.System (new) where
import Blessings
import Control.Applicative
import Control.Concurrent (forkIO,threadDelay)
import Control.Concurrent.Async (race)
import Control.Exception
import Control.Monad (forM_)
import qualified Data.HashMap.Lazy as M
import qualified Data.List as L
import qualified Data.Text.Extended as T
import qualified Data.Text.Encoding as T
import qualified Data.Text.IO as T
import qualified Data.Vector as V
import Prelude.Extended
import Reaktor
import Reaktor.Plugins.System.Internal
import System.Environment (getEnvironment)
import System.Exit
import System.FilePath.Posix (takeBaseName)
import System.IO (BufferMode(LineBuffering),hSetBuffering)
import System.IO (Handle,hClose,hPutStr,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)
import qualified Text.Regex.PCRE.Light as RE
new :: Config -> Actions -> IO (Message -> IO ())
new config@Config{..} actions@Actions{..} = do
pure $ \case
Message (Just prefix) PRIVMSG (msgtarget:text:[]) -> do
let hooks = maybe [] id (M.lookup PRIVMSG cHooks)
mapM_ (\h -> run1 config actions h prefix msgtarget text) hooks
Message (Just prefix) JOIN (channel:[]) -> do
let hooks = maybe [] id (M.lookup JOIN cHooks)
mapM_ (\h -> run1 config actions h prefix channel "") hooks
_ -> pure ()
run1 :: Config -> Actions -> Hook -> Text -> Text -> Text -> IO ()
run1 Config{..} Actions{..} Hook{..} prefix msgtarget text = do
nick <- aGetNick
let
match =
case hPattern of
Just p -> \s ->
fmap (map T.decodeUtf8) $
RE.match p (T.encodeUtf8 s) [RE.exec_no_utf8_check]
Nothing -> const Nothing
isActivated =
case hActivate of
Always -> pure ""
Match -> match text >> pure ""
Query ->
let me = nick <> ":" in
if
| isQuery -> pure ""
| T.isPrefixOf me text -> pure me
| T.isPrefixOf "*:" text -> pure "*:"
| otherwise -> mempty
audience = if isQuery then from else msgtarget
from = T.takeWhile (/='!') prefix
-- TODO check if msgtarget is one of our channels?
-- what if our nick has changed?
isQuery = msgtarget == nick
forM_ isActivated $ \activationPrefix -> do
let
text' = T.drop (T.length activationPrefix) text
resultPrefix = if isQuery then [] else [from <> ":"]
captures = V.fromList $ fromMaybe [] (match text')
capture i = captures V.!? i
name =
case hCommand of
Capture i -> fromMaybe "<unnamed>" (capture i)
CaptureOr SystemCommand{..} -> T.pack $ takeBaseName $ scPath
command =
case hCommand of
Capture i -> (`M.lookup` hCommands) =<< capture i
CaptureOr c -> Just c
args =
map (maybe "" T.unpack)
$ L.dropWhileEnd isNothing
$ flip map hArguments
$ \case
Capture i -> capture i
CaptureOr s -> Just s
case command of
Just SystemCommand{..} -> do
baseEnv <- getEnvironment
let
logStr pid s = do
let p = name <> "[" <> T.show pid <> "] "
aLog $ SGR [38,5,247] (Plain p <> s)
red :: Text -> Blessings Text
red = SGR [31] . Plain
onStart pid = logStr pid "started"
onErrLine pid s = logStr pid $ "stderr: " <> red s
onOutLine _ s = aSend (privmsg audience [s])
onError pid e = logStr pid $ "failed: " <> red (T.show e)
onExit pid = \case
ExitSuccess ->
logStr pid "stopped"
ExitFailure i ->
logStr pid $ "stopped with exit code " <>
red (T.show $ if i <= 127 then i else -256 + i)
extraEnv =
[ ("_prefix", T.unpack prefix)
, ("_from", T.unpack from)
, ("_msgtarget", T.unpack msgtarget)
]
env =
M.toList $ mconcat
[ M.fromList extraEnv
, maybe mempty id scEnv
, M.fromList baseEnv
]
cwd = scWorkDir <|> hWorkDir <|> cWorkDir
fork scPath args cwd (Just env) "" hTimeout Callbacks{..}
Nothing -> do
let s = name <> ": command not found"
aSend (privmsg audience (resultPrefix <> [s]))
data Callbacks = Callbacks
{ onOutLine :: Pid -> Text -> IO ()
, onErrLine :: Pid -> Text -> IO ()
, onError :: Pid -> SomeException -> IO ()
, onExit :: Pid -> ExitCode -> IO ()
, onStart :: Pid -> IO ()
}
fork :: FilePath
-> [String]
-> Maybe FilePath
-> Maybe [(String, String)]
-> String
-> Maybe Int
-> Callbacks
-> IO ()
fork path args cwd env input hTimeout Callbacks{..} =
forkIO (f `catch` onError (-1)) >> return ()
where
f = withCreateProcess p $ \(Just inh) (Just outh) (Just errh) ph -> do
Just pid <- getPid ph
pgid <- getProcessGroupIDOf pid
onStart pid
mapM_ forkIO [
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
}
killProcessGroup :: ProcessGroupID -> IO ()
killProcessGroup = signalProcessGroup' killProcess
signalProcessGroup' :: Signal -> ProcessGroupID -> IO ()
signalProcessGroup' sig pgid =
catchIOError
(signalProcessGroup sig pgid)
(\e -> if isDoesNotExistError e then return () else ioError e)
hWithLines :: Handle -> (Text -> IO ()) -> IO ()
hWithLines h f = do
hSetBuffering h LineBuffering
go `finally` hClose h
where
go =
hIsEOF h >>= \case
True -> return ()
False -> T.hGetLine h >>= f >> go
|
