1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
|
{-# 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 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
$ flip map hArguments
$ \case
Capture i -> capture i
CaptureOr s -> Just s
case command of
Just Command{..} -> 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 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]))
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
|
