summaryrefslogtreecommitdiff
path: root/src/Run.hs
blob: 5b0ac2eafaaac2d1f279a06206be24b0909ece44 (plain)
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
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
module Run (
    module Run.Monad,
    runTest,
) where

import Control.Applicative
import Control.Concurrent
import Control.Concurrent.STM
import Control.Monad
import Control.Monad.Except
import Control.Monad.Reader

import Data.Map qualified as M
import Data.Maybe
import Data.Set qualified as S
import Data.Scientific
import Data.Text (Text)
import qualified Data.Text as T

import System.Directory
import System.Exit
import System.IO.Error
import System.Posix.Process
import System.Posix.Signals
import System.Process

import GDB
import Network
import Network.Ip
import Output
import Process
import Run.Monad
import Test

runTest :: Output -> TestOptions -> Test -> IO Bool
runTest out opts test = do
    let testDir = optTestDir opts
    when (optForce opts) $ removeDirectoryRecursive testDir `catchIOError` \e ->
        if isDoesNotExistError e then return () else ioError e
    exists <- doesPathExist testDir
    when exists $ ioError $ userError $ testDir ++ " exists"
    createDirectoryIfMissing True testDir

    failedVar <- newTVarIO Nothing
    procVar <- newMVar []

    mgdb <- if optGDB opts
        then flip runReaderT out $ do
            gdb <- gdbStart $ atomically . writeTVar failedVar . Just . ProcessCrashed
            Just . (, gdbProcess gdb) <$> liftIO (newMVar gdb)
        else return Nothing

    let tenv = TestEnv
            { teOutput = out
            , teFailed = failedVar
            , teOptions = opts
            , teProcesses = procVar
            , teGDB = fst <$> mgdb
            }
        tstate = TestState
            { tsNetwork = error "network not initialized"
            , tsVars = []
            , tsNodePacketLoss = M.empty
            , tsDisconnectedUp = S.empty
            , tsDisconnectedBridge = S.empty
            }

    let sigHandler SignalInfo { siginfoSpecific = chld } = do
            processes <- readMVar procVar
            forM_ processes $ \p -> do
                mbpid <- getPid (procHandle p)
                when (mbpid == Just (siginfoPid chld)) $ flip runReaderT out $ do
                    let err detail = outProc OutputChildFail p detail
                    case siginfoStatus chld of
                        Exited ExitSuccess -> outProc OutputChildInfo p $ T.pack $ "child exited successfully"
                        Exited (ExitFailure code) -> do
                            err $ T.pack $ "child process exited with status " ++ show code
                            liftIO $ atomically $ writeTVar (teFailed tenv) $ Just Failed
                        Terminated sig _ -> do
                            err $ T.pack $ "child terminated with signal " ++ show sig
                            liftIO $ atomically $ writeTVar (teFailed tenv) $ Just $ ProcessCrashed p
                        Stopped sig -> err $ T.pack $ "child stopped with signal " ++ show sig
    oldHandler <- installHandler processStatusChanged (CatchInfo sigHandler) Nothing

    res <- runExceptT $ flip runReaderT (tenv, tstate) $ fromTestRun $ do
        withInternet $ \_ -> evalSteps (testSteps test)

    void $ installHandler processStatusChanged oldHandler Nothing

    Right () <- runExceptT $ flip runReaderT out $ do
        maybe (return ()) (closeProcess . snd) mgdb
    [] <- readMVar procVar

    failed <- atomically $ readTVar (teFailed tenv)
    case (res, failed) of
        (Right (), Nothing) -> do
            removeDirectoryRecursive testDir
            return True
        _ -> return False

evalSteps :: [TestStep] -> TestRun ()
evalSteps = mapM_ $ \case
    Let (SourceLine sline) (TypedVarName name) expr inner -> do
        cur <- asks (lookup name . tsVars . snd)
        when (isJust cur) $ do
            outLine OutputError Nothing $ T.pack "variable '" `T.append` textVarName name `T.append` T.pack "' already exists on " `T.append` sline
            throwError Failed
        value <- eval expr
        withVar name value $ evalSteps inner

    For (SourceLine sline) (TypedVarName name) expr inner -> do
        cur <- asks (lookup name . tsVars . snd)
        when (isJust cur) $ do
            outLine OutputError Nothing $ T.pack "variable '" `T.append` textVarName name `T.append` T.pack "' already exists on " `T.append` sline
            throwError Failed
        value <- eval expr
        forM_ value $ \i -> do
            withVar name i $ evalSteps inner

    Subnet name@(TypedVarName vname) parentExpr inner -> do
        parent <- eval parentExpr
        withSubnet parent (Just name) $ \net -> do
            withVar vname net $ evalSteps inner

    DeclNode name@(TypedVarName vname) net inner -> do
        withNode net (Left name) $ \node -> do
            withVar vname node $ evalSteps inner

    Spawn tvname@(TypedVarName vname@(VarName tname)) target inner -> do
        case target of
            Left nname -> withNode RootNetwork (Left nname) go
            Right (Left net) -> withNode net (Right tvname) go
            Right (Right node) -> go =<< eval node
      where
        go node = do
            opts <- asks $ teOptions . fst
            let pname = ProcName tname
                tool = fromMaybe (optDefaultTool opts) (lookup pname $ optProcTools opts)
            withProcess (Right node) pname Nothing tool $ \p -> do
                withVar vname p (evalSteps inner)

    Send pname expr -> do
        p <- eval pname
        line <- eval expr
        outProc OutputChildStdin p line
        send p line

    Expect line pname expr captures inner -> do
        p <- eval pname
        expect line p expr captures $ evalSteps inner

    Guard line expr -> do
        testStepGuard line expr

    DisconnectNode node inner -> do
        n <- eval node
        withDisconnectedUp n $ evalSteps inner

    DisconnectNodes net inner -> do
        n <- eval net
        withDisconnectedBridge n $ evalSteps inner

    DisconnectUpstream net inner -> do
        n <- eval net
        withDisconnectedUp n $ evalSteps inner

    PacketLoss loss node inner -> do
        l <- eval loss
        n <- eval node
        withNodePacketLoss n l $ evalSteps inner

    Wait -> do
        void $ outPromptGetLine "Waiting..."


withVar :: ExprType e => VarName -> e -> TestRun a -> TestRun a
withVar name value = local (fmap $ \s -> s { tsVars = (name, SomeVarValue value) : tsVars s })

withInternet :: (Network -> TestRun a) -> TestRun a
withInternet inner = do
    testDir <- asks $ optTestDir . teOptions . fst
    inet <- newInternet testDir
    res <- withNetwork (inetRoot inet) $ \net -> do
        local (fmap $ \s -> s { tsNetwork = net }) $ inner net
    delInternet inet
    return res

withSubnet :: Network -> Maybe (TypedVarName Network) -> (Network -> TestRun a) -> TestRun a
withSubnet parent tvname inner = do
    net <- newSubnet parent (fromTypedVarName <$> tvname)
    withNetwork net inner

withNetwork :: Network -> (Network -> TestRun a) -> TestRun a
withNetwork net inner = do
    tcpdump <- liftIO (findExecutable "tcpdump") >>= return . \case
        Just path -> withProcess (Left net) ProcNameTcpdump (Just softwareTermination)
            (path ++ " -i br0 -w '" ++ netDir net ++ "/br0.pcap' -U -Z root") . const
        Nothing -> id

    tcpdump $ inner net

withNode :: Expr Network -> Either (TypedVarName Node) (TypedVarName Process) -> (Node -> TestRun a) -> TestRun a
withNode netexpr tvname inner = do
    net <- eval netexpr
    node <- newNode net (either fromTypedVarName fromTypedVarName tvname)
    either (flip withVar node . fromTypedVarName) (const id) tvname $ inner node

withDisconnectedUp :: HasNetns n => n -> TestRun a -> TestRun a
withDisconnectedUp n inner = do
    let netns = netnsName n
    disconnected <- asks $ S.member netns . tsDisconnectedUp . snd
    if disconnected
      then inner
      else do
        local (fmap $ \s -> s { tsDisconnectedUp = S.insert netns $ tsDisconnectedUp s }) $ do
            liftIO $ callOn n $ "ip link set veth0 down"
            x <- inner
            liftIO $ callOn n $ "ip link set veth0 up"
            return x

withDisconnectedBridge :: HasNetns n => n -> TestRun a -> TestRun a
withDisconnectedBridge n inner = do
    let netns = netnsName n
    disconnected <- asks $ S.member netns . tsDisconnectedBridge . snd
    if disconnected
      then inner
      else do
        local (fmap $ \s -> s { tsDisconnectedBridge = S.insert netns $ tsDisconnectedBridge s }) $ do
            liftIO $ callOn n $ "ip link set br0 down"
            x <- inner
            liftIO $ callOn n $ "ip link set br0 up"
            return x

withNodePacketLoss :: Node -> Scientific -> TestRun a -> TestRun a
withNodePacketLoss node loss inner = do
    x <- local (fmap $ \s -> s { tsNodePacketLoss = M.insertWith (\l l' -> 1 - (1 - l) * (1 - l')) (netnsName node) loss $ tsNodePacketLoss s }) $ do
        resetLoss
        inner
    resetLoss
    return x
  where
    resetLoss = do
        tl <- asks $ fromMaybe 0 . M.lookup (netnsName node) . tsNodePacketLoss . snd
        liftIO $ callOn node $ "tc qdisc replace dev veth0 root netem loss " <> T.pack (show (tl * 100)) <> "%"


atomicallyTest :: STM a -> TestRun a
atomicallyTest act = do
    failedVar <- asks $ teFailed . fst
    res <- liftIO $ atomically $ do
        readTVar failedVar >>= \case
            Just e  -> return $ Left e
            Nothing -> Right <$> act
    case res of
        Left e -> throwError e
        Right x -> return x

tryMatch :: Regex -> [Text] -> Maybe ((Text, [Text]), [Text])
tryMatch re (x:xs) | Right (Just (_, _, _, capture)) <- regexMatch re x = Just ((x, capture), xs)
                   | otherwise = fmap (x:) <$> tryMatch re xs
tryMatch _ [] = Nothing

exprFailed :: Text -> SourceLine -> Maybe ProcName -> Expr a -> TestRun ()
exprFailed desc (SourceLine sline) pname expr = do
    let prompt = maybe T.empty textProcName pname
    exprVars <- gatherVars expr
    outLine OutputMatchFail (Just prompt) $ T.concat [desc, T.pack " failed on ", sline]
    forM_ exprVars $ \(name, value) ->
        outLine OutputMatchFail (Just prompt) $ T.concat [T.pack "  ", textVarName name, T.pack " = ", textSomeVarValue value]
    throwError Failed

expect :: SourceLine -> Process -> Expr Regex -> [TypedVarName Text] -> TestRun () -> TestRun ()
expect (SourceLine sline) p expr tvars inner = do
    re <- eval expr
    timeout <- asks $ optTimeout . teOptions . fst
    delay <- liftIO $ registerDelay $ ceiling $ 1000000 * timeout
    mbmatch <- atomicallyTest $ (Nothing <$ (check =<< readTVar delay)) <|> do
        line <- readTVar (procOutput p)
        case tryMatch re line of
             Nothing -> retry
             Just (m, out') -> do
                 writeTVar (procOutput p) out'
                 return $ Just m
    case mbmatch of
         Just (line, capture) -> do
             let vars = map (\(TypedVarName n) -> n) tvars

             when (length vars /= length capture) $ do
                 outProc OutputMatchFail p $ T.pack "mismatched number of capture variables on " `T.append` sline
                 throwError Failed

             forM_ vars $ \name -> do
                 cur <- asks (lookup name . tsVars . snd)
                 when (isJust cur) $ do
                     outProc OutputError p $ T.pack "variable '" `T.append` textVarName name `T.append` T.pack "' already exists on " `T.append` sline
                     throwError Failed

             outProc OutputMatch p line
             local (fmap $ \s -> s { tsVars = zip vars (map SomeVarValue capture) ++ tsVars s }) inner

         Nothing -> exprFailed (T.pack "expect") (SourceLine sline) (Just $ procName p) expr

testStepGuard :: SourceLine -> Expr Bool -> TestRun ()
testStepGuard sline expr = do
    x <- eval expr
    when (not x) $ exprFailed (T.pack "guard") sline Nothing expr