1 {-# LANGUAGE OverloadedStrings #-}
2 {-# LANGUAGE RankNTypes #-}
3 {-# LANGUAGE ScopedTypeVariables #-}
4 {-# LANGUAGE ExistentialQuantification #-}
7 -- Module : Language.Haskell.LSP.Test
8 -- Description : A functional testing framework for LSP servers.
9 -- Maintainer : luke_lau@icloud.com
10 -- Stability : experimental
12 -- A framework for testing <https://github.com/Microsoft/language-server-protocol Language Server Protocol servers> at the JSON level.
14 module Language.Haskell.LSP.Test
18 , runSessionWithHandler
31 , publishDiagnosticsNotification
59 import Control.Applicative
60 import Control.Applicative.Combinators
62 import Control.Monad.IO.Class
63 import Control.Concurrent
65 import qualified Data.Text as T
66 import qualified Data.Text.IO as T
68 import qualified Data.ByteString.Lazy.Char8 as B
72 import Language.Haskell.LSP.Types
73 import qualified Language.Haskell.LSP.Types as LSP (error)
74 import Language.Haskell.LSP.Messages
75 import Language.Haskell.LSP.Test.Compat
77 import System.Directory
78 import System.FilePath
79 import Language.Haskell.LSP.Test.Decoding
80 import Language.Haskell.LSP.Test.Parsing
82 -- | Starts a new session.
83 runSession :: FilePath -- ^ The filepath to the server executable.
84 -> FilePath -- ^ The filepath to the root directory for the session.
85 -> Session a -- ^ The session to run.
87 runSession serverExe rootDir session = do
89 absRootDir <- canonicalizePath rootDir
91 let initializeParams = InitializeParams (Just pid)
92 (Just $ T.pack absRootDir)
93 (Just $ filePathToUri absRootDir)
98 runSessionWithHandler listenServer serverExe rootDir $ do
100 -- Wrap the session around initialize and shutdown calls
101 sendRequest (Proxy :: Proxy InitializeRequest) Initialize initializeParams
102 RspInitialize initRsp <- response
103 liftIO $ maybe (return ()) (putStrLn . ("Error while initializing: " ++) . show ) (initRsp ^. LSP.error)
105 sendNotification Initialized InitializedParams
107 -- Run the actual test
110 sendNotification Exit ExitParams
112 -- | An internal version of 'runSession' that allows for a custom handler to listen to the server.
113 -- It also does not automatically send initialize and exit messages.
114 runSessionWithHandler :: (Handle -> Session ())
119 runSessionWithHandler serverHandler serverExe rootDir session = do
120 absRootDir <- canonicalizePath rootDir
122 (Just serverIn, Just serverOut, Nothing, serverProc) <- createProcess
123 (proc serverExe ["--lsp", "-d", "-l", "/tmp/hie-test.log"])
124 { std_in = CreatePipe, std_out = CreatePipe }
126 hSetBuffering serverIn NoBuffering
127 hSetBuffering serverOut NoBuffering
129 reqMap <- newMVar newRequestMap
130 messageChan <- newChan
131 meaninglessChan <- newChan
133 let context = SessionContext serverIn absRootDir messageChan reqMap
134 initState = SessionState (IdInt 9)
136 forkIO $ void $ runSession' meaninglessChan context initState (serverHandler serverOut)
137 (result, _) <- runSession' messageChan context initState session
139 terminateProcess serverProc
143 -- | Listens to the server output, makes sure it matches the record and
144 -- signals any semaphores
145 listenServer :: Handle -> Session ()
146 listenServer serverOut = do
147 msgBytes <- liftIO $ getNextMessage serverOut
150 reqMap <- liftIO $ readMVar $ requestMap context
152 liftIO $ writeChan (messageChan context) $ decodeFromServerMsg reqMap msgBytes
154 listenServer serverOut
156 -- | Sends a request to the server.
159 -- sendRequest (Proxy :: Proxy DocumentSymbolRequest)
160 -- TextDocumentDocumentSymbol
161 -- (DocumentSymbolParams docId)
164 :: forall params resp. (ToJSON params, ToJSON resp, FromJSON resp)
165 => Proxy (RequestMessage ClientMethod params resp) -- ^ A proxy to provide more type information about the request.
166 -> ClientMethod -- ^ The request method.
167 -> params -- ^ The request parameters.
168 -> Session LspId -- ^ The id of the request that was sent.
169 sendRequest _ method params = do
170 id <- curReqId <$> get
171 modify $ \c -> c { curReqId = nextId id }
173 let req = RequestMessage "2.0" id method params :: RequestMessage ClientMethod params resp
179 where nextId (IdInt i) = IdInt (i + 1)
180 nextId (IdString s) = IdString $ T.pack $ show $ read (T.unpack s) + 1
182 sendRequest' :: (ToJSON a, ToJSON b) => RequestMessage ClientMethod a b -> Session ()
183 sendRequest' req = do
184 -- Update the request map
185 reqMap <- requestMap <$> ask
186 liftIO $ modifyMVar_ reqMap (return . flip updateRequestMap req)
190 -- | Sends a notification to the server.
191 sendNotification :: ToJSON a
192 => ClientMethod -- ^ The notification method.
193 -> a -- ^ The notification parameters.
195 sendNotification method params =
196 let notif = NotificationMessage "2.0" method params
197 in sendNotification' notif
199 sendNotification' :: (ToJSON a, ToJSON b) => NotificationMessage a b -> Session ()
200 sendNotification' = sendMessage
202 sendResponse :: ToJSON a => ResponseMessage a -> Session ()
203 sendResponse = sendMessage
205 sendMessage :: ToJSON a => a -> Session ()
207 h <- serverIn <$> ask
208 liftIO $ B.hPut h $ addHeader (encode msg)
210 -- | Opens a text document and sends a notification to the client.
211 openDoc :: FilePath -> String -> Session TextDocumentIdentifier
212 openDoc file languageId = do
213 item <- getDocItem file languageId
214 sendNotification TextDocumentDidOpen (DidOpenTextDocumentParams item)
215 TextDocumentIdentifier <$> getDocUri file
217 -- | Reads in a text document as the first version.
218 getDocItem :: FilePath -- ^ The path to the text document to read in.
219 -> String -- ^ The language ID, e.g "haskell" for .hs files.
220 -> Session TextDocumentItem
221 getDocItem file languageId = do
223 let fp = rootDir context </> file
224 contents <- liftIO $ T.readFile fp
225 return $ TextDocumentItem (filePathToUri fp) (T.pack languageId) 0 contents
227 -- | Gets the Uri for the file corrected to the session directory.
228 getDocUri :: FilePath -> Session Uri
231 let fp = rootDir context </> file
232 return $ filePathToUri fp