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.Decoding
64 import Language.Haskell.LSP.Test.Exceptions
65 import System.Console.ANSI
66 import System.Directory
71 -- | A session representing one instance of launching and connecting to a server.
73 -- You can send and receive messages to the server within 'Session' via
74 -- 'Language.Haskell.LSP.Test.message',
75 -- 'Language.Haskell.LSP.Test.sendRequest' and
76 -- 'Language.Haskell.LSP.Test.sendNotification'.
78 type Session = ParserStateReader FromServerMessage SessionState SessionContext IO
80 #if __GLASGOW_HASKELL__ >= 806
81 instance MonadFail Session where
83 lastMsg <- fromJust . lastReceivedMessage <$> get
84 liftIO $ throw (UnexpectedMessage s lastMsg)
87 -- | Stuff you can configure for a 'Session'.
88 data SessionConfig = SessionConfig
89 { messageTimeout :: Int -- ^ Maximum time to wait for a message in seconds, defaults to 60.
90 , logStdErr :: Bool -- ^ Redirect the server's stderr to this stdout, defaults to False.
91 , logMessages :: Bool -- ^ Trace the messages sent and received to stdout, defaults to False.
92 , logColor :: Bool -- ^ Add ANSI color to the logged messages, defaults to True.
93 , lspConfig :: Maybe Value -- ^ The initial LSP config as JSON value, defaults to Nothing.
96 -- | The configuration used in 'Language.Haskell.LSP.Test.runSession'.
97 defaultConfig :: SessionConfig
98 defaultConfig = SessionConfig 60 False False True Nothing
100 instance Default SessionConfig where
103 data SessionMessage = ServerMessage FromServerMessage
107 data SessionContext = SessionContext
110 , rootDir :: FilePath
111 , messageChan :: Chan SessionMessage
112 , requestMap :: MVar RequestMap
113 , initRsp :: MVar InitializeResponse
114 , config :: SessionConfig
115 , sessionCapabilities :: ClientCapabilities
118 class Monad m => HasReader r m where
120 asks :: (r -> b) -> m b
123 instance Monad m => HasReader r (ParserStateReader a s r m) where
124 ask = lift $ lift Reader.ask
126 instance Monad m => HasReader SessionContext (ConduitM a b (StateT s (ReaderT SessionContext m))) where
127 ask = lift $ lift Reader.ask
129 data SessionState = SessionState
133 , curDiagnostics :: Map.Map NormalizedUri [Diagnostic]
134 , curTimeoutId :: Int
135 , overridingTimeout :: Bool
136 -- ^ The last received message from the server.
137 -- Used for providing exception information
138 , lastReceivedMessage :: Maybe FromServerMessage
141 class Monad m => HasState s m where
146 modify :: (s -> s) -> m ()
147 modify f = get >>= put . f
149 modifyM :: (HasState s m, Monad m) => (s -> m s) -> m ()
150 modifyM f = get >>= f >>= put
152 instance Monad m => HasState s (ParserStateReader a s r m) where
154 put = lift . State.put
156 instance Monad m => HasState SessionState (ConduitM a b (StateT SessionState m))
159 put = lift . State.put
161 type ParserStateReader a s r m = ConduitParser a (StateT s (ReaderT r m))
163 runSession :: SessionContext -> SessionState -> Session a -> IO (a, SessionState)
164 runSession context state session = runReaderT (runStateT conduit state) context
166 conduit = runConduit $ chanSource .| watchdog .| updateStateC .| runConduitParser (catchError session handler)
168 handler (Unexpected "ConduitParser.empty") = do
169 lastMsg <- fromJust . lastReceivedMessage <$> get
170 name <- getParserName
171 liftIO $ throw (UnexpectedMessage (T.unpack name) lastMsg)
176 msg <- liftIO $ readChan (messageChan context)
180 watchdog :: ConduitM SessionMessage FromServerMessage (StateT SessionState (ReaderT SessionContext IO)) ()
181 watchdog = Conduit.awaitForever $ \msg -> do
182 curId <- curTimeoutId <$> get
184 ServerMessage sMsg -> yield sMsg
185 TimeoutMessage tId -> when (curId == tId) $ throw Timeout
187 -- | An internal version of 'runSession' that allows for a custom handler to listen to the server.
188 -- It also does not automatically send initialize and exit messages.
189 runSessionWithHandles :: Handle -- ^ Server in
190 -> Handle -- ^ Server out
191 -> ProcessHandle -- ^ Server process
192 -> (Handle -> SessionContext -> IO ()) -- ^ Server listener
194 -> ClientCapabilities
195 -> FilePath -- ^ Root directory
196 -> Session () -- ^ To exit the Server properly
199 runSessionWithHandles serverIn serverOut serverProc serverHandler config caps rootDir exitServer session = do
201 absRootDir <- canonicalizePath rootDir
203 hSetBuffering serverIn NoBuffering
204 hSetBuffering serverOut NoBuffering
205 -- This is required to make sure that we don’t get any
206 -- newline conversion or weird encoding issues.
207 hSetBinaryMode serverIn True
208 hSetBinaryMode serverOut True
210 reqMap <- newMVar newRequestMap
211 messageChan <- newChan
212 initRsp <- newEmptyMVar
214 mainThreadId <- myThreadId
216 let context = SessionContext serverIn absRootDir messageChan reqMap initRsp config caps
217 initState = SessionState (IdInt 0) mempty mempty 0 False Nothing
218 runSession' = runSession context initState
220 errorHandler = throwTo mainThreadId :: SessionException -> IO()
221 serverLauncher = forkIO $ catch (serverHandler serverOut context) errorHandler
222 server = (Just serverIn, Just serverOut, Nothing, serverProc)
223 serverFinalizer tid = finally (timeout (messageTimeout config * 1000000)
224 (runSession' exitServer))
225 (cleanupProcess server >> killThread tid)
227 (result, _) <- bracket serverLauncher serverFinalizer (const $ runSession' session)
230 updateStateC :: ConduitM FromServerMessage FromServerMessage (StateT SessionState (ReaderT SessionContext IO)) ()
231 updateStateC = awaitForever $ \msg -> do
235 updateState :: (MonadIO m, HasReader SessionContext m, HasState SessionState m) => FromServerMessage -> m ()
236 updateState (NotPublishDiagnostics n) = do
237 let List diags = n ^. params . diagnostics
238 doc = n ^. params . uri
240 let newDiags = Map.insert (toNormalizedUri doc) diags (curDiagnostics s)
241 in s { curDiagnostics = newDiags })
243 updateState (ReqApplyWorkspaceEdit r) = do
245 allChangeParams <- case r ^. params . edit . documentChanges of
247 mapM_ (checkIfNeedsOpened . (^. textDocument . uri)) cs
248 return $ map getParams cs
249 Nothing -> case r ^. params . edit . changes of
251 mapM_ checkIfNeedsOpened (HashMap.keys cs)
252 return $ concatMap (uncurry getChangeParams) (HashMap.toList cs)
253 Nothing -> error "No changes!"
256 newVFS <- liftIO $ changeFromServerVFS (vfs s) r
257 return $ s { vfs = newVFS }
259 let groupedParams = groupBy (\a b -> a ^. textDocument == b ^. textDocument) allChangeParams
260 mergedParams = map mergeParams groupedParams
262 -- TODO: Don't do this when replaying a session
263 forM_ mergedParams (sendMessage . NotificationMessage "2.0" TextDocumentDidChange)
265 -- Update VFS to new document versions
266 let sortedVersions = map (sortBy (compare `on` (^. textDocument . version))) groupedParams
267 latestVersions = map ((^. textDocument) . last) sortedVersions
268 bumpedVersions = map (version . _Just +~ 1) latestVersions
270 forM_ bumpedVersions $ \(VersionedTextDocumentIdentifier uri v) ->
273 update (VirtualFile oldV t mf) = VirtualFile (fromMaybe oldV v) t mf
274 newVFS = Map.adjust update (toNormalizedUri uri) oldVFS
275 in s { vfs = newVFS }
277 where checkIfNeedsOpened uri = do
278 oldVFS <- vfs <$> get
281 -- if its not open, open it
282 unless (toNormalizedUri uri `Map.member` oldVFS) $ do
283 let fp = fromJust $ uriToFilePath uri
284 contents <- liftIO $ T.readFile fp
285 let item = TextDocumentItem (filePathToUri fp) "" 0 contents
286 msg = NotificationMessage "2.0" TextDocumentDidOpen (DidOpenTextDocumentParams item)
287 liftIO $ B.hPut (serverIn ctx) $ addHeader (encode msg)
290 newVFS <- liftIO $ openVFS (vfs s) msg
291 return $ s { vfs = newVFS }
293 getParams (TextDocumentEdit docId (List edits)) =
294 let changeEvents = map (\e -> TextDocumentContentChangeEvent (Just (e ^. range)) Nothing (e ^. newText)) edits
295 in DidChangeTextDocumentParams docId (List changeEvents)
297 textDocumentVersions uri = map (VersionedTextDocumentIdentifier uri . Just) [0..]
299 textDocumentEdits uri edits = map (\(v, e) -> TextDocumentEdit v (List [e])) $ zip (textDocumentVersions uri) edits
301 getChangeParams uri (List edits) = map getParams (textDocumentEdits uri (reverse edits))
303 mergeParams :: [DidChangeTextDocumentParams] -> DidChangeTextDocumentParams
304 mergeParams params = let events = concat (toList (map (toList . (^. contentChanges)) params))
305 in DidChangeTextDocumentParams (head params ^. textDocument) (List events)
306 updateState _ = return ()
308 sendMessage :: (MonadIO m, HasReader SessionContext m, ToJSON a) => a -> m ()
310 h <- serverIn <$> ask
312 liftIO $ B.hPut h (addHeader $ encode msg)
314 -- | Execute a block f that will throw a 'Timeout' exception
315 -- after duration seconds. This will override the global timeout
316 -- for waiting for messages to arrive defined in 'SessionConfig'.
317 withTimeout :: Int -> Session a -> Session a
318 withTimeout duration f = do
319 chan <- asks messageChan
320 timeoutId <- curTimeoutId <$> get
321 modify $ \s -> s { overridingTimeout = True }
323 threadDelay (duration * 1000000)
324 writeChan chan (TimeoutMessage timeoutId)
326 modify $ \s -> s { curTimeoutId = timeoutId + 1,
327 overridingTimeout = False
331 data LogMsgType = LogServer | LogClient
334 -- | Logs the message if the config specified it
335 logMsg :: (ToJSON a, MonadIO m, HasReader SessionContext m)
336 => LogMsgType -> a -> m ()
338 shouldLog <- asks $ logMessages . config
339 shouldColor <- asks $ logColor . config
340 liftIO $ when shouldLog $ do
341 when shouldColor $ setSGR [SetColor Foreground Dull color]
342 putStrLn $ arrow ++ showPretty msg
343 when shouldColor $ setSGR [Reset]
346 | t == LogServer = "<-- "
349 | t == LogServer = Magenta
352 showPretty = B.unpack . encodePretty