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|
{-# LANGUAGE GeneralizedNewtypeDeriving #-}
-- | A version of REPL that interacts through a websocket.
module Minilang.REPL.Net where
import Control.Concurrent.STM (atomically)
import Control.Concurrent.STM.TVar
import Control.Monad.Catch
import Control.Monad.State
import Data.Aeson
( ToJSON,
eitherDecode,
encode,
object,
(.=),
)
import Data.ByteString (ByteString)
import qualified Data.ByteString.Lazy as LBS
import Data.Either (fromRight)
import Data.Map as Map
import Data.Serialize hiding (encode)
import Data.Text (Text, pack, unpack)
import Data.Text.Encoding (decodeUtf8With)
import Data.Text.Encoding.Error (lenientDecode)
import Minilang.Log
import Minilang.REPL (withInputs)
import Minilang.REPL.Pure (render)
import Minilang.REPL.Purer (purerREPL)
import Minilang.REPL.Run (runREPL)
import Minilang.REPL.Types
import Network.Wai (Application)
import Network.Wai.Handler.WebSockets
import qualified Network.WebSockets as WS
import System.Directory (getCurrentDirectory)
import System.FilePath (takeFileName, (</>))
-- | Configuration of the WS server
data ServerConfig = ServerConfig
{ -- | The host/IP to listen on. If 0.0.0.0, then the server listens
configHost :: String,
-- | The port to listen on. If 0, a random port will be assigned.
configPort :: Int
}
deriving (Eq, Show)
data NetEnv = NetEnv
{ connection :: WS.Connection,
logger :: LoggerEnv IO,
repl :: TVar REPLEnv
-- , storage :: FileStorage
}
newtype Net m a = Net {runNet :: StateT NetEnv m a}
deriving (Functor, Applicative, Monad, MonadTrans, MonadIO, MonadState NetEnv)
instance Serialize In where
put out = do
let bs = encode out
putWord64be (fromIntegral $ LBS.length bs)
putLazyByteString bs
get = do
len <- getWord64be
bs <- getLazyByteString (fromIntegral len)
case eitherDecode bs of
Right out -> pure out
Left err -> fail err
-- doStore :: In -> Net IO (Either Text ())
-- doStore out = do
-- fs <- gets storage
-- res <- liftIO $ store fs (pure $ Right out) handleStorageResult
-- case res of
-- WriteSucceed _ -> pure $ Right ()
-- err -> pure $ Left (pack $ show err)
-- where
-- handleStorageResult (Right (WriteSucceed _)) = pure $ Right ()
-- handleStorageResult (Right err) = pure $ Left $ pack $ show err
-- handleStorageResult (Left err) = pure $ Left $ pack err
netLog :: (ToJSON a) => a -> Net IO ()
netLog logEntry = gets logger >>= liftIO . flip logInfo logEntry
instance MonadREPL (Net IO) where
input = do
inp <- gets connection >>= lift . wsReceive
-- res <- doStore inp
-- case res of
-- Right () -> netLog (object ["action" .= ("input" :: Text), "content" .= inp])
-- Left txt -> netLog (object ["action" .= ("storageError" :: Text), "content" .= txt])
netLog (object ["action" .= ("input" :: Text), "content" .= inp])
pure inp
output a = do
gets connection >>= lift . wsSend a
netLog
( object
[ "action" .= ("output" :: Text),
"content" .= a,
"rendered" .= render a
]
)
prompt = pure ()
getEnv = gets repl >>= lift . readTVarIO
setEnv e' = gets repl >>= lift . atomically . flip writeTVar e'
-- TODO what does this mean? perhaps it coiuld be used to load some
-- virtual files edited by user in their env?
load = const (pure (Right ""))
instance (MonadThrow m) => MonadThrow (Net m) where
throwM = lift . throwM
instance (MonadCatch m) => MonadCatch (Net m) where
Net m `catch` f = Net $ m `catch` \e -> runNet (f e)
-- instance TypeChecker (Net IO) where
-- emit (CheckD ev) = gets logger >>= \env -> liftIO $ logInfo env ev
-- emit _ = pure ()
wsReceive :: WS.Connection -> IO In
wsReceive cnx =
fromRight (In "") . eitherDecode <$> WS.receiveData cnx
wsSend :: Out -> WS.Connection -> IO ()
wsSend out cnx =
WS.sendBinaryData cnx (encode out)
safeDecodeUtf8 :: ByteString -> Text
safeDecodeUtf8 = decodeUtf8With lenientDecode
clientHandler :: LoggerEnv IO -> TVar (Map ByteString (TVar REPLEnv)) -> WS.PendingConnection -> IO ()
clientHandler loggerEnv envs cnx = do
let path = WS.requestPath $ WS.pendingRequest cnx
logInfo loggerEnv $ object ["action" .= ("StartedREPL" :: Text), "path" .= safeDecodeUtf8 path]
conn <- WS.acceptRequest cnx
-- storageFile <- mkStorageFile path
-- withStorage storageFile $ \fileStorage -> do
replEnv <- newREPLEnv
WS.withPingThread conn 30 (pure ()) $
evalStateT (runNet runREPL) (NetEnv conn loggerEnv replEnv)
where
newREPLEnv = newTVarIO initialREPL
-- findOrCreateREPL :: (H.Store IO store) => store -> ByteString -> IO (TVar REPLEnv)
-- findOrCreateREPL storageFile path = do
-- (env, shouldLoad) <- atomically $ do
-- envMaps <- readTVar envs
-- (newEnv, shouldLoad) <- case Map.lookup path envMaps of
-- Nothing -> newTVar initialREPL >>= \v -> pure (v, True)
-- Just e -> pure (e, False)
-- writeTVar envs (Map.insert path newEnv envMaps)
-- pure (newEnv, shouldLoad)
-- -- FIXME there is a race condition here
-- if shouldLoad
-- then replay storageFile env
-- else pure env
-- mkStorageFile path = do
-- let f = takeFileName (unpack (safeDecodeUtf8 path))
-- dir <- getCurrentDirectory
-- pure $ defaultOptions {storageFilePath = dir </> f}
-- replay :: (H.Store IO store) => store -> TVar REPLEnv -> IO (TVar REPLEnv)
-- replay storage envVar = do
-- res <- H.load storage
-- case res of
-- LoadSucceed coms -> do
-- atomically $ do
-- env <- readTVar envVar
-- let newEnv = withInputs env coms
-- writeTVar envVar (purerREPL newEnv)
-- logInfo loggerEnv $
-- object
-- [ "action" .= ("Loaded" :: Text),
-- "numCommands" .= length coms
-- ]
-- pure envVar
-- err -> do
-- logInfo loggerEnv $ object ["action" .= ("ErrorLoading" :: Text), "error" .= pack (show err)]
-- pure envVar
runNetREPL :: LoggerEnv IO -> TVar (Map ByteString (TVar REPLEnv)) -> Application -> Application
runNetREPL loggerEnv envs = websocketsOr WS.defaultConnectionOptions (clientHandler loggerEnv envs)
|
