Track changes to haskell-lsp

[lsp-test.git] / src / Language / Haskell / LSP / Test / Session.hs

diff --git a/src/Language/Haskell/LSP/Test/Session.hs b/src/Language/Haskell/LSP/Test/Session.hs
index eb75fda1db2c8fd5d5c1bdf010f77dd5544cb30a..3426bcce47c66e105ddb235b13d308a92dcafe45 100644 (file)
--- a/src/Language/Haskell/LSP/Test/Session.hs
+++ b/src/Language/Haskell/LSP/Test/Session.hs
@@ -1,39 +1,53 @@
+{-# LANGUAGE CPP               #-}

 {-# LANGUAGE OverloadedStrings #-}
 {-# LANGUAGE OverloadedStrings #-}

+{-# LANGUAGE GeneralizedNewtypeDeriving #-}

 {-# LANGUAGE FlexibleInstances #-}
 {-# LANGUAGE MultiParamTypeClasses #-}
 {-# LANGUAGE FlexibleContexts #-}
 {-# LANGUAGE FlexibleInstances #-}
 {-# LANGUAGE MultiParamTypeClasses #-}
 {-# LANGUAGE FlexibleContexts #-}

+{-# LANGUAGE RankNTypes #-}

 
 module Language.Haskell.LSP.Test.Session
 
 module Language.Haskell.LSP.Test.Session

-  ( Session
+  ( Session(..)

   , SessionConfig(..)
   , SessionConfig(..)

+  , defaultConfig
+  , SessionMessage(..)

   , SessionContext(..)
   , SessionState(..)
   , SessionContext(..)
   , SessionState(..)

-  , MonadSessionConfig(..)

   , runSessionWithHandles
   , get
   , put
   , modify
   , runSessionWithHandles
   , get
   , put
   , modify

+  , modifyM

   , ask
   , asks
   , sendMessage
   , ask
   , asks
   , sendMessage

-  , processMessage)
+  , updateState
+  , withTimeout
+  , logMsg
+  , LogMsgType(..)
+  )

 
 where
 
 
 where
 

+import Control.Applicative

 import Control.Concurrent hiding (yield)
 import Control.Exception
 import Control.Lens hiding (List)
 import Control.Monad
 import Control.Monad.IO.Class
 import Control.Monad.Except
 import Control.Concurrent hiding (yield)
 import Control.Exception
 import Control.Lens hiding (List)
 import Control.Monad
 import Control.Monad.IO.Class
 import Control.Monad.Except

+#if __GLASGOW_HASKELL__ == 806
+import Control.Monad.Fail
+#endif

 import Control.Monad.Trans.Reader (ReaderT, runReaderT)
 import qualified Control.Monad.Trans.Reader as Reader (ask)
 import Control.Monad.Trans.State (StateT, runStateT)
 import Control.Monad.Trans.Reader (ReaderT, runReaderT)
 import qualified Control.Monad.Trans.Reader as Reader (ask)
 import Control.Monad.Trans.State (StateT, runStateT)

-import qualified Control.Monad.Trans.State as State (get, put)
+import qualified Control.Monad.Trans.State as State

 import qualified Data.ByteString.Lazy.Char8 as B
 import Data.Aeson
 import qualified Data.ByteString.Lazy.Char8 as B
 import Data.Aeson

-import Data.Conduit hiding (await)
-import Data.Conduit.Parser
+import Data.Aeson.Encode.Pretty
+import Data.Conduit as Conduit
+import Data.Conduit.Parser as Parser

 import Data.Default
 import Data.Foldable
 import Data.List
 import Data.Default
 import Data.Foldable
 import Data.List


@@ -42,9 +56,11 @@ import qualified Data.Text as T
 import qualified Data.Text.IO as T
 import qualified Data.HashMap.Strict as HashMap
 import Data.Maybe
 import qualified Data.Text.IO as T
 import qualified Data.HashMap.Strict as HashMap
 import Data.Maybe

+import Data.Function

 import Language.Haskell.LSP.Messages
 import Language.Haskell.LSP.Messages

-import Language.Haskell.LSP.TH.ClientCapabilities
-import Language.Haskell.LSP.Types hiding (error)
+import Language.Haskell.LSP.Types.Capabilities
+import Language.Haskell.LSP.Types
+import Language.Haskell.LSP.Types.Lens hiding (error)

 import Language.Haskell.LSP.VFS
 import Language.Haskell.LSP.Test.Compat
 import Language.Haskell.LSP.Test.Decoding
 import Language.Haskell.LSP.VFS
 import Language.Haskell.LSP.Test.Compat
 import Language.Haskell.LSP.Test.Decoding


@@ -52,45 +68,58 @@ import Language.Haskell.LSP.Test.Exceptions
 import System.Console.ANSI
 import System.Directory
 import System.IO
 import System.Console.ANSI
 import System.Directory
 import System.IO

+import System.Process (ProcessHandle())
+import System.Timeout

 
 -- | A session representing one instance of launching and connecting to a server.
 --
 
 -- | A session representing one instance of launching and connecting to a server.
 --

--- You can send and receive messages to the server within 'Session' via 'getMessage',
--- 'sendRequest' and 'sendNotification'.
---
--- @
--- runSession \"path\/to\/root\/dir\" $ do
---   docItem <- getDocItem "Desktop/simple.hs" "haskell"
---   sendNotification TextDocumentDidOpen (DidOpenTextDocumentParams docItem)
---   diagnostics <- getMessage :: Session PublishDiagnosticsNotification
--- @
-type Session = ParserStateReader FromServerMessage SessionState SessionContext IO
+-- You can send and receive messages to the server within 'Session' via
+-- 'Language.Haskell.LSP.Test.message',
+-- 'Language.Haskell.LSP.Test.sendRequest' and
+-- 'Language.Haskell.LSP.Test.sendNotification'.
+
+newtype Session a = Session (ConduitParser FromServerMessage (StateT SessionState (ReaderT SessionContext IO)) a)
+  deriving (Functor, Applicative, Monad, MonadIO, Alternative)
+
+#if __GLASGOW_HASKELL__ >= 806
+instance MonadFail Session where
+  fail s = do
+    lastMsg <- fromJust . lastReceivedMessage <$> get
+    liftIO $ throw (UnexpectedMessage s lastMsg)
+#endif

 
 -- | Stuff you can configure for a 'Session'.
 data SessionConfig = SessionConfig
 
 -- | Stuff you can configure for a 'Session'.
 data SessionConfig = SessionConfig

-  {
-    capabilities :: ClientCapabilities -- ^ Specific capabilities the client should advertise. Default is yes to everything.
-  , timeout :: Int -- ^ Maximum time to wait for a request in seconds. Defaults to 60.
-  , logStdErr :: Bool -- ^ When True redirects the servers stderr output to haskell-lsp-test's stdout. Defaults to False
+  { messageTimeout :: Int  -- ^ Maximum time to wait for a message in seconds, defaults to 60.
+  , logStdErr      :: Bool -- ^ Redirect the server's stderr to this stdout, defaults to False.
+  , logMessages    :: Bool -- ^ Trace the messages sent and received to stdout, defaults to False.
+  , logColor       :: Bool -- ^ Add ANSI color to the logged messages, defaults to True.
+  , lspConfig      :: Maybe Value -- ^ The initial LSP config as JSON value, defaults to Nothing.
+  -- ^ Whether or not to ignore 'ShowMessageNotification' and 'LogMessageNotification', defaults to False.
+  -- @since 0.9.0.0
+  , ignoreLogNotifications :: Bool

   }
 
   }
 

-instance Default SessionConfig where
-  def = SessionConfig def 60 False
+-- | The configuration used in 'Language.Haskell.LSP.Test.runSession'.
+defaultConfig :: SessionConfig
+defaultConfig = SessionConfig 60 False False True Nothing False

 
 

-class Monad m => MonadSessionConfig m where
-  sessionConfig :: m SessionConfig
+instance Default SessionConfig where
+  def = defaultConfig

 
 

-instance Monad m => MonadSessionConfig (StateT SessionState (ReaderT SessionContext m)) where
-  sessionConfig = config <$> lift Reader.ask
+data SessionMessage = ServerMessage FromServerMessage
+                    | TimeoutMessage Int
+  deriving Show

 
 data SessionContext = SessionContext
   {
     serverIn :: Handle
   , rootDir :: FilePath
 
 data SessionContext = SessionContext
   {
     serverIn :: Handle
   , rootDir :: FilePath

-  , messageChan :: Chan FromServerMessage
+  , messageChan :: Chan SessionMessage

   , requestMap :: MVar RequestMap
   , initRsp :: MVar InitializeResponse
   , config :: SessionConfig
   , requestMap :: MVar RequestMap
   , initRsp :: MVar InitializeResponse
   , config :: SessionConfig

+  , sessionCapabilities :: ClientCapabilities

   }
 
 class Monad m => HasReader r m where
   }
 
 class Monad m => HasReader r m where


@@ -98,17 +127,22 @@ class Monad m => HasReader r m where
   asks :: (r -> b) -> m b
   asks f = f <$> ask
 
   asks :: (r -> b) -> m b
   asks f = f <$> ask
 

-instance Monad m => HasReader r (ParserStateReader a s r m) where
-  ask = lift $ lift Reader.ask
+instance HasReader SessionContext Session where
+  ask  = Session (lift $ lift Reader.ask)

 
 

-instance HasReader SessionContext SessionProcessor where
+instance Monad m => HasReader r (ConduitM a b (StateT s (ReaderT r m))) where

   ask = lift $ lift Reader.ask
 
 data SessionState = SessionState
   {
     curReqId :: LspId
   , vfs :: VFS
   ask = lift $ lift Reader.ask
 
 data SessionState = SessionState
   {
     curReqId :: LspId
   , vfs :: VFS

-  , curDiagnostics :: Map.Map Uri [Diagnostic]
+  , curDiagnostics :: Map.Map NormalizedUri [Diagnostic]
+  , curTimeoutId :: Int
+  , overridingTimeout :: Bool
+  -- ^ The last received message from the server.
+  -- Used for providing exception information
+  , lastReceivedMessage :: Maybe FromServerMessage

   }
 
 class Monad m => HasState s m where
   }
 
 class Monad m => HasState s m where


@@ -119,87 +153,113 @@ class Monad m => HasState s m where
   modify :: (s -> s) -> m ()
   modify f = get >>= put . f
 
   modify :: (s -> s) -> m ()
   modify f = get >>= put . f
 

-instance Monad m => HasState s (ParserStateReader a s r m) where
+  modifyM :: (HasState s m, Monad m) => (s -> m s) -> m ()
+  modifyM f = get >>= f >>= put
+
+instance HasState SessionState Session where
+  get = Session (lift State.get)
+  put = Session . lift . State.put
+
+instance Monad m => HasState s (ConduitM a b (StateT s m))
+ where

   get = lift State.get
   put = lift . State.put
 
   get = lift State.get
   put = lift . State.put
 

-instance HasState SessionState SessionProcessor where
+instance Monad m => HasState s (ConduitParser a (StateT s m))
+ where

   get = lift State.get
   put = lift . State.put
 
   get = lift State.get
   put = lift . State.put
 

-type ParserStateReader a s r m = ConduitParser a (StateT s (ReaderT r m))
-
-type SessionProcessor = ConduitM FromServerMessage FromServerMessage (StateT SessionState (ReaderT SessionContext IO))
-
-runSession :: Chan FromServerMessage -> SessionProcessor () -> SessionContext -> SessionState -> Session a -> IO (a, SessionState)
-runSession chan preprocessor context state session = runReaderT (runStateT conduit state) context
-  where conduit = runConduit $ chanSource chan .| preprocessor .| runConduitParser (catchError session handler)
-        handler e@(Unexpected "ConduitParser.empty") = do
+runSession :: SessionContext -> SessionState -> Session a -> IO (a, SessionState)
+runSession context state (Session session) = runReaderT (runStateT conduit state) context
+  where
+    conduit = runConduit $ chanSource .| watchdog .| updateStateC .| runConduitParser (catchError session handler)

 
 

-          -- Horrible way to get last item in conduit:
-          -- Add a fake message so we can tell when to stop
-          liftIO $ writeChan chan (RspShutdown (ResponseMessage "EMPTY" IdRspNull Nothing Nothing))
-          x <- peek
-          case x of
-            Just x -> do
-              lastMsg <- skipToEnd x
+    handler (Unexpected "ConduitParser.empty") = do
+      lastMsg <- fromJust . lastReceivedMessage <$> get

       name <- getParserName
       name <- getParserName

-              liftIO $ throw (UnexpectedMessageException (T.unpack name) lastMsg)
-            Nothing -> throw e
+      liftIO $ throw (UnexpectedMessage (T.unpack name) lastMsg)

 
     handler e = throw e
 
 
     handler e = throw e
 

-        skipToEnd x = do
-          y <- peek
-          case y of
-            Just (RspShutdown (ResponseMessage "EMPTY" IdRspNull Nothing Nothing)) -> return x
-            Just _ -> await >>= skipToEnd
-            Nothing -> return x
+    chanSource = do
+      msg <- liftIO $ readChan (messageChan context)
+      unless (ignoreLogNotifications (config context) && isLogNotification msg) $
+        yield msg
+      chanSource
+
+    isLogNotification (ServerMessage (NotShowMessage _)) = True
+    isLogNotification (ServerMessage (NotLogMessage _)) = True
+    isLogNotification _ = False
+
+    watchdog :: ConduitM SessionMessage FromServerMessage (StateT SessionState (ReaderT SessionContext IO)) ()
+    watchdog = Conduit.awaitForever $ \msg -> do
+      curId <- curTimeoutId <$> get
+      case msg of
+        ServerMessage sMsg -> yield sMsg
+        TimeoutMessage tId -> when (curId == tId) $ lastReceivedMessage <$> get >>= throw . Timeout

 
 -- | An internal version of 'runSession' that allows for a custom handler to listen to the server.
 -- It also does not automatically send initialize and exit messages.
 runSessionWithHandles :: Handle -- ^ Server in
                       -> Handle -- ^ Server out
 
 -- | An internal version of 'runSession' that allows for a custom handler to listen to the server.
 -- It also does not automatically send initialize and exit messages.
 runSessionWithHandles :: Handle -- ^ Server in
                       -> Handle -- ^ Server out

+                      -> ProcessHandle -- ^ Server process

                       -> (Handle -> SessionContext -> IO ()) -- ^ Server listener
                       -> SessionConfig
                       -> (Handle -> SessionContext -> IO ()) -- ^ Server listener
                       -> SessionConfig

-                      -> FilePath
+                      -> ClientCapabilities
+                      -> FilePath -- ^ Root directory
+                      -> Session () -- ^ To exit the Server properly

                       -> Session a
                       -> IO a
                       -> Session a
                       -> IO a

-runSessionWithHandles serverIn serverOut serverHandler config rootDir session = do
+runSessionWithHandles serverIn serverOut serverProc serverHandler config caps rootDir exitServer session = do

   absRootDir <- canonicalizePath rootDir
 
   hSetBuffering serverIn  NoBuffering
   hSetBuffering serverOut NoBuffering
   absRootDir <- canonicalizePath rootDir
 
   hSetBuffering serverIn  NoBuffering
   hSetBuffering serverOut NoBuffering

+  -- This is required to make sure that we don’t get any
+  -- newline conversion or weird encoding issues.
+  hSetBinaryMode serverIn True
+  hSetBinaryMode serverOut True

 
   reqMap <- newMVar newRequestMap
   messageChan <- newChan
   initRsp <- newEmptyMVar
 
 
   reqMap <- newMVar newRequestMap
   messageChan <- newChan
   initRsp <- newEmptyMVar
 

-  let context = SessionContext serverIn absRootDir messageChan reqMap initRsp config
-      initState = SessionState (IdInt 0) mempty mempty
+  mainThreadId <- myThreadId

 
 

-  threadId <- forkIO $ void $ serverHandler serverOut context
-  (result, _) <- runSession messageChan processor context initState session
+  let context = SessionContext serverIn absRootDir messageChan reqMap initRsp config caps
+      initState vfs = SessionState (IdInt 0) vfs
+                                       mempty 0 False Nothing
+      runSession' ses = initVFS $ \vfs -> runSession context (initState vfs) ses

 
 

-  killThread threadId
+      errorHandler = throwTo mainThreadId :: SessionException -> IO()
+      serverListenerLauncher =
+        forkIO $ catch (serverHandler serverOut context) errorHandler
+      server = (Just serverIn, Just serverOut, Nothing, serverProc)
+      serverAndListenerFinalizer tid =
+        finally (timeout (messageTimeout config * 1000000)
+                         (runSession' exitServer))
+                (cleanupProcess server >> killThread tid)

 
 

+  (result, _) <- bracket serverListenerLauncher serverAndListenerFinalizer
+                         (const $ runSession' session)

   return result
 
   return result
 

-  where processor :: SessionProcessor ()
-        processor = awaitForever $ \msg -> do
-          processMessage msg
+updateStateC :: ConduitM FromServerMessage FromServerMessage (StateT SessionState (ReaderT SessionContext IO)) ()
+updateStateC = awaitForever $ \msg -> do
+  updateState msg

   yield msg
 
   yield msg
 

-
-processMessage :: (MonadIO m, HasReader SessionContext m, HasState SessionState m) => FromServerMessage -> m ()
-processMessage (NotPublishDiagnostics n) = do
+updateState :: (MonadIO m, HasReader SessionContext m, HasState SessionState m)
+            => FromServerMessage -> m ()
+updateState (NotPublishDiagnostics n) = do

   let List diags = n ^. params . diagnostics
       doc = n ^. params . uri
   modify (\s ->
   let List diags = n ^. params . diagnostics
       doc = n ^. params . uri
   modify (\s ->

-    let newDiags = Map.insert doc diags (curDiagnostics s) 
+    let newDiags = Map.insert (toNormalizedUri doc) diags (curDiagnostics s)

       in s { curDiagnostics = newDiags })
 
       in s { curDiagnostics = newDiags })
 

-processMessage (ReqApplyWorkspaceEdit r) = do
+updateState (ReqApplyWorkspaceEdit r) = do

 
   allChangeParams <- case r ^. params . edit . documentChanges of
     Just (List cs) -> do
 
   allChangeParams <- case r ^. params . edit . documentChanges of
     Just (List cs) -> do


@@ -211,37 +271,49 @@ processMessage (ReqApplyWorkspaceEdit r) = do
         return $ concatMap (uncurry getChangeParams) (HashMap.toList cs)
       Nothing -> error "No changes!"
 
         return $ concatMap (uncurry getChangeParams) (HashMap.toList cs)
       Nothing -> error "No changes!"
 

-  oldVFS <- vfs <$> get
-  newVFS <- liftIO $ changeFromServerVFS oldVFS r
-  modify (\s -> s { vfs = newVFS })
+  modifyM $ \s -> do
+    newVFS <- liftIO $ changeFromServerVFS (vfs s) r
+    return $ s { vfs = newVFS }

 
 

-  let groupedParams = groupBy (\a b -> (a ^. textDocument == b ^. textDocument)) allChangeParams
+  let groupedParams = groupBy (\a b -> a ^. textDocument == b ^. textDocument) allChangeParams

       mergedParams = map mergeParams groupedParams
 
   -- TODO: Don't do this when replaying a session
   forM_ mergedParams (sendMessage . NotificationMessage "2.0" TextDocumentDidChange)
 
       mergedParams = map mergeParams groupedParams
 
   -- TODO: Don't do this when replaying a session
   forM_ mergedParams (sendMessage . NotificationMessage "2.0" TextDocumentDidChange)
 

+  -- Update VFS to new document versions
+  let sortedVersions = map (sortBy (compare `on` (^. textDocument . version))) groupedParams
+      latestVersions = map ((^. textDocument) . last) sortedVersions
+      bumpedVersions = map (version . _Just +~ 1) latestVersions
+
+  forM_ bumpedVersions $ \(VersionedTextDocumentIdentifier uri v) ->
+    modify $ \s ->
+      let oldVFS = vfs s
+          update (VirtualFile oldV file_ver t) = VirtualFile (fromMaybe oldV v) (file_ver + 1) t
+          newVFS = updateVFS (Map.adjust update (toNormalizedUri uri)) oldVFS
+      in s { vfs = newVFS }
+

   where checkIfNeedsOpened uri = do
           oldVFS <- vfs <$> get
           ctx <- ask
 
           -- if its not open, open it
   where checkIfNeedsOpened uri = do
           oldVFS <- vfs <$> get
           ctx <- ask
 
           -- if its not open, open it

-          unless (uri `Map.member` oldVFS) $ do
+          unless (toNormalizedUri uri `Map.member` vfsMap oldVFS) $ do

             let fp = fromJust $ uriToFilePath uri
             contents <- liftIO $ T.readFile fp
             let item = TextDocumentItem (filePathToUri fp) "" 0 contents
                 msg = NotificationMessage "2.0" TextDocumentDidOpen (DidOpenTextDocumentParams item)
             liftIO $ B.hPut (serverIn ctx) $ addHeader (encode msg)
 
             let fp = fromJust $ uriToFilePath uri
             contents <- liftIO $ T.readFile fp
             let item = TextDocumentItem (filePathToUri fp) "" 0 contents
                 msg = NotificationMessage "2.0" TextDocumentDidOpen (DidOpenTextDocumentParams item)
             liftIO $ B.hPut (serverIn ctx) $ addHeader (encode msg)
 

-            oldVFS <- vfs <$> get
-            newVFS <- liftIO $ openVFS oldVFS msg
-            modify (\s -> s { vfs = newVFS })
+            modifyM $ \s -> do
+              let (newVFS,_) = openVFS (vfs s) msg
+              return $ s { vfs = newVFS }

 
         getParams (TextDocumentEdit docId (List edits)) =
           let changeEvents = map (\e -> TextDocumentContentChangeEvent (Just (e ^. range)) Nothing (e ^. newText)) edits
             in DidChangeTextDocumentParams docId (List changeEvents)
 
 
         getParams (TextDocumentEdit docId (List edits)) =
           let changeEvents = map (\e -> TextDocumentContentChangeEvent (Just (e ^. range)) Nothing (e ^. newText)) edits
             in DidChangeTextDocumentParams docId (List changeEvents)
 

-        textDocumentVersions uri = map (VersionedTextDocumentIdentifier uri) [0..]
+        textDocumentVersions uri = map (VersionedTextDocumentIdentifier uri . Just) [0..]

 
         textDocumentEdits uri edits = map (\(v, e) -> TextDocumentEdit v (List [e])) $ zip (textDocumentVersions uri) edits
 
 
         textDocumentEdits uri edits = map (\(v, e) -> TextDocumentEdit v (List [e])) $ zip (textDocumentVersions uri) edits
 


@@ -250,20 +322,52 @@ processMessage (ReqApplyWorkspaceEdit r) = do
         mergeParams :: [DidChangeTextDocumentParams] -> DidChangeTextDocumentParams
         mergeParams params = let events = concat (toList (map (toList . (^. contentChanges)) params))
                               in DidChangeTextDocumentParams (head params ^. textDocument) (List events)
         mergeParams :: [DidChangeTextDocumentParams] -> DidChangeTextDocumentParams
         mergeParams params = let events = concat (toList (map (toList . (^. contentChanges)) params))
                               in DidChangeTextDocumentParams (head params ^. textDocument) (List events)

-processMessage _ = return ()
+updateState _ = return ()

 
 sendMessage :: (MonadIO m, HasReader SessionContext m, ToJSON a) => a -> m ()
 sendMessage msg = do
   h <- serverIn <$> ask
 
 sendMessage :: (MonadIO m, HasReader SessionContext m, ToJSON a) => a -> m ()
 sendMessage msg = do
   h <- serverIn <$> ask

-  let encoded = encode msg
-  liftIO $ do
+  logMsg LogClient msg
+  liftIO $ B.hPut h (addHeader $ encode msg)
+
+-- | Execute a block f that will throw a 'Timeout' exception
+-- after duration seconds. This will override the global timeout
+-- for waiting for messages to arrive defined in 'SessionConfig'.
+withTimeout :: Int -> Session a -> Session a
+withTimeout duration f = do
+  chan <- asks messageChan
+  timeoutId <- curTimeoutId <$> get
+  modify $ \s -> s { overridingTimeout = True }
+  liftIO $ forkIO $ do
+    threadDelay (duration * 1000000)
+    writeChan chan (TimeoutMessage timeoutId)
+  res <- f
+  modify $ \s -> s { curTimeoutId = timeoutId + 1,
+                     overridingTimeout = False
+                   }
+  return res
+
+data LogMsgType = LogServer | LogClient
+  deriving Eq
+
+-- | Logs the message if the config specified it
+logMsg :: (ToJSON a, MonadIO m, HasReader SessionContext m)
+       => LogMsgType -> a -> m ()
+logMsg t msg = do
+  shouldLog <- asks $ logMessages . config
+  shouldColor <- asks $ logColor . config
+  liftIO $ when shouldLog $ do
+    when shouldColor $ setSGR [SetColor Foreground Dull color]
+    putStrLn $ arrow ++ showPretty msg
+    when shouldColor $ setSGR [Reset]
+
+  where arrow
+          | t == LogServer  = "<-- "
+          | otherwise       = "--> "
+        color
+          | t == LogServer  = Magenta
+          | otherwise       = Cyan

 
 

-    setSGR [SetColor Foreground Vivid Cyan]
-    putStrLn $ "--> " ++ B.unpack encoded
-    setSGR [Reset]
+        showPretty = B.unpack . encodePretty

 
 

-    B.hPut h (addHeader encoded)

 
 

--- withTimeout :: Int -> Session a -> Session a
--- withTimeout duration = do
---   liftIO $ fork threadDelay