2 {-# LANGUAGE OverloadedStrings #-}
3 {-# LANGUAGE FlexibleInstances #-}
4 {-# LANGUAGE MultiParamTypeClasses #-}
5 {-# LANGUAGE FlexibleContexts #-}
6 {-# LANGUAGE RankNTypes #-}
8 module Language.Haskell.LSP.Test.Session
15 , runSessionWithHandles
31 import Control.Concurrent hiding (yield)
32 import Control.Exception
33 import Control.Lens hiding (List)
35 import Control.Monad.IO.Class
36 import Control.Monad.Except
37 #if __GLASGOW_HASKELL__ >= 806
38 import Control.Monad.Fail
40 import Control.Monad.Trans.Reader (ReaderT, runReaderT)
41 import qualified Control.Monad.Trans.Reader as Reader (ask)
42 import Control.Monad.Trans.State (StateT, runStateT)
43 import qualified Control.Monad.Trans.State as State (get, put)
44 import qualified Data.ByteString.Lazy.Char8 as B
46 import Data.Aeson.Encode.Pretty
47 import Data.Conduit as Conduit
48 import Data.Conduit.Parser as Parser
52 import qualified Data.Map as Map
53 import qualified Data.Text as T
54 import qualified Data.Text.IO as T
55 import qualified Data.HashMap.Strict as HashMap
58 import Language.Haskell.LSP.Messages
59 import Language.Haskell.LSP.Types.Capabilities
60 import Language.Haskell.LSP.Types
61 import Language.Haskell.LSP.Types.Lens hiding (error)
62 import Language.Haskell.LSP.VFS
63 import Language.Haskell.LSP.Test.Compat
64 import Language.Haskell.LSP.Test.Decoding
65 import Language.Haskell.LSP.Test.Exceptions
66 import System.Console.ANSI
67 import System.Directory
69 import System.Process (ProcessHandle())
72 -- | A session representing one instance of launching and connecting to a server.
74 -- You can send and receive messages to the server within 'Session' via
75 -- 'Language.Haskell.LSP.Test.message',
76 -- 'Language.Haskell.LSP.Test.sendRequest' and
77 -- 'Language.Haskell.LSP.Test.sendNotification'.
79 type Session = ParserStateReader FromServerMessage SessionState SessionContext IO
81 #if __GLASGOW_HASKELL__ >= 806
82 instance MonadFail Session where
84 lastMsg <- fromJust . lastReceivedMessage <$> get
85 liftIO $ throw (UnexpectedMessage s lastMsg)
88 -- | Stuff you can configure for a 'Session'.
89 data SessionConfig = SessionConfig
90 { messageTimeout :: Int -- ^ Maximum time to wait for a message in seconds, defaults to 60.
91 , logStdErr :: Bool -- ^ Redirect the server's stderr to this stdout, defaults to False.
92 , logMessages :: Bool -- ^ Trace the messages sent and received to stdout, defaults to False.
93 , logColor :: Bool -- ^ Add ANSI color to the logged messages, defaults to True.
94 , lspConfig :: Maybe Value -- ^ The initial LSP config as JSON value, defaults to Nothing.
97 -- | The configuration used in 'Language.Haskell.LSP.Test.runSession'.
98 defaultConfig :: SessionConfig
99 defaultConfig = SessionConfig 60 False False True Nothing
101 instance Default SessionConfig where
104 data SessionMessage = ServerMessage FromServerMessage
108 data SessionContext = SessionContext
111 , rootDir :: FilePath
112 , messageChan :: Chan SessionMessage
113 , requestMap :: MVar RequestMap
114 , initRsp :: MVar InitializeResponse
115 , config :: SessionConfig
116 , sessionCapabilities :: ClientCapabilities
119 class Monad m => HasReader r m where
121 asks :: (r -> b) -> m b
124 instance Monad m => HasReader r (ParserStateReader a s r m) where
125 ask = lift $ lift Reader.ask
127 instance Monad m => HasReader SessionContext (ConduitM a b (StateT s (ReaderT SessionContext m))) where
128 ask = lift $ lift Reader.ask
130 data SessionState = SessionState
134 , curDiagnostics :: Map.Map NormalizedUri [Diagnostic]
135 , curTimeoutId :: Int
136 , overridingTimeout :: Bool
137 -- ^ The last received message from the server.
138 -- Used for providing exception information
139 , lastReceivedMessage :: Maybe FromServerMessage
142 class Monad m => HasState s m where
147 modify :: (s -> s) -> m ()
148 modify f = get >>= put . f
150 modifyM :: (HasState s m, Monad m) => (s -> m s) -> m ()
151 modifyM f = get >>= f >>= put
153 instance Monad m => HasState s (ParserStateReader a s r m) where
155 put = lift . State.put
157 instance Monad m => HasState SessionState (ConduitM a b (StateT SessionState m))
160 put = lift . State.put
162 type ParserStateReader a s r m = ConduitParser a (StateT s (ReaderT r m))
164 runSession :: SessionContext -> SessionState -> Session a -> IO (a, SessionState)
165 runSession context state session = runReaderT (runStateT conduit state) context
167 conduit = runConduit $ chanSource .| watchdog .| updateStateC .| runConduitParser (catchError session handler)
169 handler (Unexpected "ConduitParser.empty") = do
170 lastMsg <- fromJust . lastReceivedMessage <$> get
171 name <- getParserName
172 liftIO $ throw (UnexpectedMessage (T.unpack name) lastMsg)
177 msg <- liftIO $ readChan (messageChan context)
181 watchdog :: ConduitM SessionMessage FromServerMessage (StateT SessionState (ReaderT SessionContext IO)) ()
182 watchdog = Conduit.awaitForever $ \msg -> do
183 curId <- curTimeoutId <$> get
185 ServerMessage sMsg -> yield sMsg
186 TimeoutMessage tId -> when (curId == tId) $ throw Timeout
188 -- | An internal version of 'runSession' that allows for a custom handler to listen to the server.
189 -- It also does not automatically send initialize and exit messages.
190 runSessionWithHandles :: Handle -- ^ Server in
191 -> Handle -- ^ Server out
192 -> ProcessHandle -- ^ Server process
193 -> (Handle -> SessionContext -> IO ()) -- ^ Server listener
195 -> ClientCapabilities
196 -> FilePath -- ^ Root directory
197 -> Session () -- ^ To exit the Server properly
200 runSessionWithHandles serverIn serverOut serverProc serverHandler config caps rootDir exitServer session = do
202 absRootDir <- canonicalizePath rootDir
204 hSetBuffering serverIn NoBuffering
205 hSetBuffering serverOut NoBuffering
206 -- This is required to make sure that we don’t get any
207 -- newline conversion or weird encoding issues.
208 hSetBinaryMode serverIn True
209 hSetBinaryMode serverOut True
211 reqMap <- newMVar newRequestMap
212 messageChan <- newChan
213 initRsp <- newEmptyMVar
215 mainThreadId <- myThreadId
217 let context = SessionContext serverIn absRootDir messageChan reqMap initRsp config caps
218 initState = SessionState (IdInt 0) mempty mempty 0 False Nothing
219 runSession' = runSession context initState
221 errorHandler = throwTo mainThreadId :: SessionException -> IO()
222 serverLauncher = forkIO $ catch (serverHandler serverOut context) errorHandler
223 server = (Just serverIn, Just serverOut, Nothing, serverProc)
224 serverFinalizer tid = finally (timeout (messageTimeout config * 1000000)
225 (runSession' exitServer))
226 (cleanupRunningProcess server >> killThread tid)
228 (result, _) <- bracket serverLauncher serverFinalizer (const $ runSession' session)
231 updateStateC :: ConduitM FromServerMessage FromServerMessage (StateT SessionState (ReaderT SessionContext IO)) ()
232 updateStateC = awaitForever $ \msg -> do
236 updateState :: (MonadIO m, HasReader SessionContext m, HasState SessionState m) => FromServerMessage -> m ()
237 updateState (NotPublishDiagnostics n) = do
238 let List diags = n ^. params . diagnostics
239 doc = n ^. params . uri
241 let newDiags = Map.insert (toNormalizedUri doc) diags (curDiagnostics s)
242 in s { curDiagnostics = newDiags })
244 updateState (ReqApplyWorkspaceEdit r) = do
246 allChangeParams <- case r ^. params . edit . documentChanges of
248 mapM_ (checkIfNeedsOpened . (^. textDocument . uri)) cs
249 return $ map getParams cs
250 Nothing -> case r ^. params . edit . changes of
252 mapM_ checkIfNeedsOpened (HashMap.keys cs)
253 return $ concatMap (uncurry getChangeParams) (HashMap.toList cs)
254 Nothing -> error "No changes!"
257 newVFS <- liftIO $ changeFromServerVFS (vfs s) r
258 return $ s { vfs = newVFS }
260 let groupedParams = groupBy (\a b -> a ^. textDocument == b ^. textDocument) allChangeParams
261 mergedParams = map mergeParams groupedParams
263 -- TODO: Don't do this when replaying a session
264 forM_ mergedParams (sendMessage . NotificationMessage "2.0" TextDocumentDidChange)
266 -- Update VFS to new document versions
267 let sortedVersions = map (sortBy (compare `on` (^. textDocument . version))) groupedParams
268 latestVersions = map ((^. textDocument) . last) sortedVersions
269 bumpedVersions = map (version . _Just +~ 1) latestVersions
271 forM_ bumpedVersions $ \(VersionedTextDocumentIdentifier uri v) ->
274 update (VirtualFile oldV t mf) = VirtualFile (fromMaybe oldV v) t mf
275 newVFS = Map.adjust update (toNormalizedUri uri) oldVFS
276 in s { vfs = newVFS }
278 where checkIfNeedsOpened uri = do
279 oldVFS <- vfs <$> get
282 -- if its not open, open it
283 unless (toNormalizedUri uri `Map.member` oldVFS) $ do
284 let fp = fromJust $ uriToFilePath uri
285 contents <- liftIO $ T.readFile fp
286 let item = TextDocumentItem (filePathToUri fp) "" 0 contents
287 msg = NotificationMessage "2.0" TextDocumentDidOpen (DidOpenTextDocumentParams item)
288 liftIO $ B.hPut (serverIn ctx) $ addHeader (encode msg)
291 newVFS <- liftIO $ openVFS (vfs s) msg
292 return $ s { vfs = newVFS }
294 getParams (TextDocumentEdit docId (List edits)) =
295 let changeEvents = map (\e -> TextDocumentContentChangeEvent (Just (e ^. range)) Nothing (e ^. newText)) edits
296 in DidChangeTextDocumentParams docId (List changeEvents)
298 textDocumentVersions uri = map (VersionedTextDocumentIdentifier uri . Just) [0..]
300 textDocumentEdits uri edits = map (\(v, e) -> TextDocumentEdit v (List [e])) $ zip (textDocumentVersions uri) edits
302 getChangeParams uri (List edits) = map getParams (textDocumentEdits uri (reverse edits))
304 mergeParams :: [DidChangeTextDocumentParams] -> DidChangeTextDocumentParams
305 mergeParams params = let events = concat (toList (map (toList . (^. contentChanges)) params))
306 in DidChangeTextDocumentParams (head params ^. textDocument) (List events)
307 updateState _ = return ()
309 sendMessage :: (MonadIO m, HasReader SessionContext m, ToJSON a) => a -> m ()
311 h <- serverIn <$> ask
313 liftIO $ B.hPut h (addHeader $ encode msg)
315 -- | Execute a block f that will throw a 'Timeout' exception
316 -- after duration seconds. This will override the global timeout
317 -- for waiting for messages to arrive defined in 'SessionConfig'.
318 withTimeout :: Int -> Session a -> Session a
319 withTimeout duration f = do
320 chan <- asks messageChan
321 timeoutId <- curTimeoutId <$> get
322 modify $ \s -> s { overridingTimeout = True }
324 threadDelay (duration * 1000000)
325 writeChan chan (TimeoutMessage timeoutId)
327 modify $ \s -> s { curTimeoutId = timeoutId + 1,
328 overridingTimeout = False
332 data LogMsgType = LogServer | LogClient
335 -- | Logs the message if the config specified it
336 logMsg :: (ToJSON a, MonadIO m, HasReader SessionContext m)
337 => LogMsgType -> a -> m ()
339 shouldLog <- asks $ logMessages . config
340 shouldColor <- asks $ logColor . config
341 liftIO $ when shouldLog $ do
342 when shouldColor $ setSGR [SetColor Foreground Dull color]
343 putStrLn $ arrow ++ showPretty msg
344 when shouldColor $ setSGR [Reset]
347 | t == LogServer = "<-- "
350 | t == LogServer = Magenta
353 showPretty = B.unpack . encodePretty