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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 qualified Data.HashMap.Lazy as M
import qualified Data.List as L
import qualified Data.Text.Extended 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.Heavy as RE
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) cmd (msgtarget:text:[]) | elem cmd ["PRIVMSG", "JOIN"] -> do
let hooks = maybe [] id (M.lookup cmd 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
isActivated =
case hActivate of
Always -> Just ""
Match ->
case hPattern of
Nothing -> Nothing
Just pat ->
let
result = RE.scan patternRE text
patternRE = RE.compile pat [RE.utf8]
in
if null result
then Nothing
else Just ""
Query ->
if
| T.isPrefixOf (nick <> ":") text ->
Just (nick <> ":")
| T.isPrefixOf "*:" text ->
Just "*:"
| isQuery ->
Just ""
| otherwise ->
Nothing
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
case isActivated of
Just trigger -> do
let
cmdline = T.dropWhile (==' ') $ T.drop (T.length trigger) text
resultPrefix = if isQuery then [] else [from <> ":"]
parseCommandLine' pat s =
if null result then [] else snd (head result)
where
result = RE.scan patternRE s
patternRE = RE.compile pat [RE.utf8]
captures =
V.fromList $
case hPattern of
Nothing -> [] -- TODO everything?
Just pat -> parseCommandLine' pat cmdline
capture i = captures V.!? (i - 1)
name =
case hCommand of
Capture i -> fromMaybe "<unnamed>" (capture i)
CaptureOr Command{..} -> T.pack $ takeBaseName $ commandPath
command =
case hCommand of
Capture i -> (`M.lookup` hCommands) =<< capture i
CaptureOr c -> Just c
args =
map (maybe "" T.unpack)
$ L.dropWhileEnd isNothing
-- $ map getArgument hArguments
$ flip map hArguments
$ \case
Capture i -> capture i
CaptureOr s -> Just s
case command of
Just Command{..} -> do
baseEnv <- getEnvironment
let
onExit code = do
let s = T.show code
(sig, col) =
if code == ExitSuccess
then (SGR [38,5,235] "* ", SGR [38,5,107])
else (SGR [38,5,235] "! ", SGR [31,1])
aLog $ sig <> col (Plain $ name <> ": " <> s)
onExcept :: SomeException -> IO ()
onExcept e = do
let s0 = T.show e
aLog $ SGR [38,5,235] "! "
<> SGR [31,1] (Plain $ name <> ": " <> s0)
onErrLine :: Text -> IO ()
onErrLine s0 = do
aLog $ SGR [38,5,235] "2 "
<> SGR [31,1] (Plain $ name <> ": " <> s0)
onOutLine s = aSend (privmsg audience [s])
extraEnv =
[ ("_prefix", T.unpack prefix)
, ("_from", T.unpack from)
]
env =
M.toList $ mconcat
[ M.fromList extraEnv
, maybe mempty id commandEnv
, M.fromList baseEnv
]
cwd = commandWorkDir <|> hWorkDir <|> cWorkDir
fork commandPath args cwd (Just env) "" hTimeout Callbacks{..}
Nothing -> do
let s = name <> ": command not found"
aSend (privmsg audience (resultPrefix <> [s]))
Nothing -> return ()
data Callbacks = Callbacks
{ onOutLine :: Text -> IO ()
, onErrLine :: Text -> IO ()
, onExit :: ExitCode -> IO ()
, onExcept :: SomeException -> 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` onExcept) >> return ()
where
f = withCreateProcess p $ \(Just inh) (Just outh) (Just errh) ph -> do
Just pid <- getPid ph
pgid <- getProcessGroupIDOf pid
mapM_ forkIO [
hPutStr inh input `finally` hClose inh,
hWithLines outh onOutLine,
hWithLines errh onErrLine
]
case hTimeout of
Just time ->
race (threadDelay time) (waitForProcess ph) >>= \case
Left () -> onExcept (SomeException (ErrorCall "timeout"))
Right code -> onExit code
Nothing ->
waitForProcess ph >>= onExit
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
|
