mirror of
https://github.com/hasura/graphql-engine.git
synced 2024-12-18 04:51:35 +03:00
2b1d5be10a
PR-URL: https://github.com/hasura/graphql-engine-mono/pull/8014 GitOrigin-RevId: eef2d1ce99ec87bb239584c3ca4a9f056131b5cc
487 lines
19 KiB
Haskell
487 lines
19 KiB
Haskell
{-# LANGUAGE NondecreasingIndentation #-}
|
|
{-# LANGUAGE TemplateHaskell #-}
|
|
|
|
module Hasura.GraphQL.Transport.WebSocket.Server
|
|
( AcceptWith (AcceptWith),
|
|
HasuraServerApp,
|
|
MessageDetails (MessageDetails),
|
|
MonadWSLog (..),
|
|
OnConnH,
|
|
WSActions (..),
|
|
WSConn,
|
|
WSErrorMessage (..),
|
|
WSEvent (EMessageSent),
|
|
WSEventInfo (WSEventInfo, _wseiEventType, _wseiOperationId, _wseiOperationName, _wseiParameterizedQueryHash, _wseiQueryExecutionTime, _wseiResponseSize),
|
|
WSHandlers (WSHandlers),
|
|
WSId,
|
|
WSKeepAliveMessageAction,
|
|
WSLog (WSLog),
|
|
WSOnErrorMessageAction,
|
|
WSQueueResponse (WSQueueResponse),
|
|
WSServer,
|
|
closeConn,
|
|
sendMsgAndCloseConn,
|
|
createServerApp,
|
|
createWSServer,
|
|
getData,
|
|
getRawWebSocketConnection,
|
|
getWSId,
|
|
mkWSServerErrorCode,
|
|
sendMsg,
|
|
shutdown,
|
|
|
|
-- * exported for testing
|
|
mkUnsafeWSId,
|
|
)
|
|
where
|
|
|
|
import Control.Concurrent.Async qualified as A
|
|
import Control.Concurrent.Async.Lifted.Safe qualified as LA
|
|
import Control.Concurrent.STM qualified as STM
|
|
import Control.Exception.Lifted
|
|
import Control.Monad.Trans.Control qualified as MC
|
|
import Data.Aeson qualified as J
|
|
import Data.Aeson.Casing qualified as J
|
|
import Data.Aeson.TH qualified as J
|
|
import Data.ByteString.Char8 qualified as B
|
|
import Data.ByteString.Lazy qualified as BL
|
|
import Data.CaseInsensitive qualified as CI
|
|
import Data.SerializableBlob qualified as SB
|
|
import Data.String
|
|
import Data.Text qualified as T
|
|
import Data.UUID qualified as UUID
|
|
import Data.UUID.V4 qualified as UUID
|
|
import Data.Word (Word16)
|
|
import GHC.AssertNF.CPP
|
|
import GHC.Int (Int64)
|
|
import Hasura.GraphQL.ParameterizedQueryHash (ParameterizedQueryHash)
|
|
import Hasura.GraphQL.Transport.HTTP.Protocol
|
|
import Hasura.GraphQL.Transport.WebSocket.Protocol
|
|
import Hasura.Logging qualified as L
|
|
import Hasura.Prelude
|
|
import Hasura.RQL.Types.Common (MetricsConfig (..))
|
|
import Hasura.Server.Init.Config (WSConnectionInitTimeout (..))
|
|
import Hasura.Server.Prometheus
|
|
( PrometheusMetrics (..),
|
|
)
|
|
import ListT qualified
|
|
import Network.Wai.Extended (IpAddress)
|
|
import Network.Wai.Handler.Warp qualified as Warp
|
|
import Network.WebSockets qualified as WS
|
|
import Refined (unrefine)
|
|
import StmContainers.Map qualified as STMMap
|
|
import System.IO.Error qualified as E
|
|
import System.Metrics.Prometheus.Counter qualified as Prometheus.Counter
|
|
import System.TimeManager qualified as TM
|
|
|
|
newtype WSId = WSId {unWSId :: UUID.UUID}
|
|
deriving (Show, Eq, Hashable)
|
|
|
|
mkUnsafeWSId :: UUID.UUID -> WSId
|
|
mkUnsafeWSId = WSId
|
|
|
|
instance J.ToJSON WSId where
|
|
toJSON (WSId uuid) =
|
|
J.toJSON $ UUID.toText uuid
|
|
|
|
-- | Websocket message and other details
|
|
data MessageDetails = MessageDetails
|
|
{ _mdMessage :: !SB.SerializableBlob,
|
|
_mdMessageSize :: !Int64
|
|
}
|
|
deriving (Show)
|
|
|
|
$(J.deriveToJSON hasuraJSON ''MessageDetails)
|
|
|
|
data WSEvent
|
|
= EConnectionRequest
|
|
| EAccepted
|
|
| ERejected
|
|
| EMessageReceived !MessageDetails
|
|
| EMessageSent !MessageDetails
|
|
| EJwtExpired
|
|
| ECloseReceived
|
|
| ECloseSent !SB.SerializableBlob
|
|
| EClosed
|
|
deriving (Show)
|
|
|
|
$( J.deriveToJSON
|
|
J.defaultOptions
|
|
{ J.constructorTagModifier = J.snakeCase . drop 1,
|
|
J.sumEncoding = J.TaggedObject "type" "detail"
|
|
}
|
|
''WSEvent
|
|
)
|
|
|
|
-- extra websocket event info
|
|
data WSEventInfo = WSEventInfo
|
|
{ _wseiEventType :: !(Maybe ServerMsgType),
|
|
_wseiOperationId :: !(Maybe OperationId),
|
|
_wseiOperationName :: !(Maybe OperationName),
|
|
_wseiQueryExecutionTime :: !(Maybe Double),
|
|
_wseiResponseSize :: !(Maybe Int64),
|
|
_wseiParameterizedQueryHash :: !(Maybe ParameterizedQueryHash)
|
|
}
|
|
deriving (Show, Eq)
|
|
|
|
$( J.deriveToJSON
|
|
J.defaultOptions
|
|
{ J.fieldLabelModifier = J.snakeCase . drop 5,
|
|
J.omitNothingFields = True
|
|
}
|
|
''WSEventInfo
|
|
)
|
|
|
|
data WSLog = WSLog
|
|
{ _wslWebsocketId :: !WSId,
|
|
_wslEvent :: !WSEvent,
|
|
_wslMetadata :: !(Maybe WSEventInfo)
|
|
}
|
|
deriving (Show)
|
|
|
|
$( J.deriveToJSON
|
|
J.defaultOptions
|
|
{ J.fieldLabelModifier = J.snakeCase . drop 4,
|
|
J.omitNothingFields = True
|
|
}
|
|
''WSLog
|
|
)
|
|
|
|
class Monad m => MonadWSLog m where
|
|
-- | Takes WS server log data and logs it
|
|
-- logWSServer
|
|
logWSLog :: L.Logger L.Hasura -> WSLog -> m ()
|
|
|
|
instance MonadWSLog m => MonadWSLog (ExceptT e m) where
|
|
logWSLog l ws = lift $ logWSLog l ws
|
|
|
|
instance MonadWSLog m => MonadWSLog (ReaderT r m) where
|
|
logWSLog l ws = lift $ logWSLog l ws
|
|
|
|
instance L.ToEngineLog WSLog L.Hasura where
|
|
toEngineLog wsLog =
|
|
(L.LevelDebug, L.ELTInternal L.ILTWsServer, J.toJSON wsLog)
|
|
|
|
data WSQueueResponse = WSQueueResponse
|
|
{ _wsqrMessage :: !BL.ByteString,
|
|
-- | extra metadata that we use for other actions, such as print log
|
|
-- we don't want to inlcude them into websocket message payload
|
|
_wsqrEventInfo :: !(Maybe WSEventInfo)
|
|
}
|
|
|
|
data WSConn a = WSConn
|
|
{ _wcConnId :: !WSId,
|
|
_wcLogger :: !(L.Logger L.Hasura),
|
|
_wcConnRaw :: !WS.Connection,
|
|
_wcSendQ :: !(STM.TQueue WSQueueResponse),
|
|
_wcExtraData :: !a
|
|
}
|
|
|
|
getRawWebSocketConnection :: WSConn a -> WS.Connection
|
|
getRawWebSocketConnection = _wcConnRaw
|
|
|
|
getData :: WSConn a -> a
|
|
getData = _wcExtraData
|
|
|
|
getWSId :: WSConn a -> WSId
|
|
getWSId = _wcConnId
|
|
|
|
closeConn :: WSConn a -> BL.ByteString -> IO ()
|
|
closeConn wsConn = closeConnWithCode wsConn 1000 -- 1000 is "normal close"
|
|
|
|
-- | Closes a connection with code 1012, which means "Server is restarting"
|
|
-- good clients will implement a retry logic with a backoff of a few seconds
|
|
forceConnReconnect :: MonadIO m => WSConn a -> BL.ByteString -> m ()
|
|
forceConnReconnect wsConn bs = liftIO $ closeConnWithCode wsConn 1012 bs
|
|
|
|
closeConnWithCode :: WSConn a -> Word16 -> BL.ByteString -> IO ()
|
|
closeConnWithCode wsConn code bs = do
|
|
((\x -> L.unLogger x) . _wcLogger) wsConn $
|
|
WSLog (_wcConnId wsConn) (ECloseSent $ SB.fromLBS bs) Nothing
|
|
WS.sendCloseCode (_wcConnRaw wsConn) code bs
|
|
|
|
sendMsgAndCloseConn :: WSConn a -> Word16 -> BL.ByteString -> ServerMsg -> IO ()
|
|
sendMsgAndCloseConn wsConn errCode bs serverErr = do
|
|
WS.sendTextData (_wcConnRaw wsConn) (encodeServerMsg serverErr)
|
|
WS.sendCloseCode (_wcConnRaw wsConn) errCode bs
|
|
|
|
-- writes to a queue instead of the raw connection
|
|
-- so that sendMsg doesn't block
|
|
sendMsg :: WSConn a -> WSQueueResponse -> IO ()
|
|
sendMsg wsConn !resp = do
|
|
$assertNFHere resp -- so we don't write thunks to mutable vars
|
|
STM.atomically $ STM.writeTQueue (_wcSendQ wsConn) resp
|
|
|
|
type ConnMap a = STMMap.Map WSId (WSConn a)
|
|
|
|
data ServerStatus a
|
|
= AcceptingConns !(ConnMap a)
|
|
| ShuttingDown
|
|
|
|
data WSServer a = WSServer
|
|
{ _wssLogger :: !(L.Logger L.Hasura),
|
|
-- | See e.g. createServerApp.onAccept for how we use STM to preserve consistency
|
|
_wssStatus :: !(STM.TVar (ServerStatus a))
|
|
}
|
|
|
|
createWSServer :: L.Logger L.Hasura -> STM.STM (WSServer a)
|
|
createWSServer logger = do
|
|
connMap <- STMMap.new
|
|
serverStatus <- STM.newTVar (AcceptingConns connMap)
|
|
return $ WSServer logger serverStatus
|
|
|
|
closeAllWith ::
|
|
(BL.ByteString -> WSConn a -> IO ()) ->
|
|
BL.ByteString ->
|
|
[(WSId, WSConn a)] ->
|
|
IO ()
|
|
closeAllWith closer msg conns =
|
|
void $ A.mapConcurrently (closer msg . snd) conns
|
|
|
|
-- | Resets the current connections map to an empty one if the server is
|
|
-- running and returns the list of connections that were in the map
|
|
-- before flushing it.
|
|
flushConnMap :: STM.TVar (ServerStatus a) -> STM.STM [(WSId, WSConn a)]
|
|
flushConnMap serverStatus = do
|
|
status <- STM.readTVar serverStatus
|
|
case status of
|
|
AcceptingConns connMap -> do
|
|
conns <- ListT.toList $ STMMap.listT connMap
|
|
STMMap.reset connMap
|
|
return conns
|
|
ShuttingDown -> return []
|
|
|
|
data AcceptWith a = AcceptWith
|
|
{ _awData :: !a,
|
|
_awReq :: !WS.AcceptRequest,
|
|
_awKeepAlive :: !(WSConn a -> IO ()),
|
|
_awOnJwtExpiry :: !(WSConn a -> IO ())
|
|
}
|
|
|
|
-- | These set of functions or message handlers is used by the
|
|
-- server while communicating with the client. They are particularly
|
|
-- useful for the case when the messages being sent to the client
|
|
-- are different for each of the sub-protocol(s) supported by the server.
|
|
type WSKeepAliveMessageAction a = WSConn a -> IO ()
|
|
|
|
type WSPostExecErrMessageAction a = WSConn a -> OperationId -> GQExecError -> IO ()
|
|
|
|
type WSOnErrorMessageAction a = WSConn a -> ConnErrMsg -> WSErrorMessage -> IO ()
|
|
|
|
type WSCloseConnAction a = WSConn a -> OperationId -> String -> IO ()
|
|
|
|
-- | Used for specific actions within the `onConn` and `onMessage` handlers
|
|
data WSActions a = WSActions
|
|
{ _wsaPostExecErrMessageAction :: !(WSPostExecErrMessageAction a),
|
|
_wsaOnErrorMessageAction :: !(WSOnErrorMessageAction a),
|
|
_wsaConnectionCloseAction :: !(WSCloseConnAction a),
|
|
-- | NOTE: keep alive action was made redundant because we need to send this message
|
|
-- after the connection has been successfully established after `connection_init`
|
|
_wsaKeepAliveAction :: !(WSKeepAliveMessageAction a),
|
|
_wsaGetDataMessageType :: !(DataMsg -> ServerMsg),
|
|
_wsaAcceptRequest :: !WS.AcceptRequest,
|
|
_wsaErrorMsgFormat :: !([J.Value] -> J.Value)
|
|
}
|
|
|
|
data WSErrorMessage = ClientMessageParseFailed | ConnInitFailed
|
|
|
|
mkWSServerErrorCode :: WSErrorMessage -> ConnErrMsg -> ServerErrorCode
|
|
mkWSServerErrorCode errorMessage connErrMsg = case errorMessage of
|
|
ClientMessageParseFailed -> (GenericError4400 $ ("Parsing client message failed: ") <> (T.unpack . unConnErrMsg $ connErrMsg))
|
|
ConnInitFailed -> (GenericError4400 $ ("Connection initialization failed: ") <> (T.unpack . unConnErrMsg $ connErrMsg))
|
|
|
|
type OnConnH m a = WSId -> WS.RequestHead -> IpAddress -> WSActions a -> m (Either WS.RejectRequest (AcceptWith a))
|
|
|
|
-- type OnMessageH m a = WSConn a -> BL.ByteString -> WSActions a -> m ()
|
|
|
|
type OnCloseH m a = WSConn a -> m ()
|
|
|
|
-- | aka generalized 'WS.ServerApp' over @m@, which takes an IPAddress
|
|
type HasuraServerApp m = IpAddress -> WS.PendingConnection -> m ()
|
|
|
|
-- | NOTE: The types of `_hOnConn` and `_hOnMessage` were updated from `OnConnH` and `OnMessageH`
|
|
-- because we needed to pass the subprotcol here to these methods to eventually get to `OnConnH` and `OnMessageH`.
|
|
-- Please see `createServerApp` to get a better understanding of how these handlers are used.
|
|
data WSHandlers m a = WSHandlers
|
|
{ _hOnConn :: (WSId -> WS.RequestHead -> IpAddress -> WSSubProtocol -> m (Either WS.RejectRequest (AcceptWith a))),
|
|
_hOnMessage :: (WSConn a -> BL.ByteString -> WSSubProtocol -> m ()),
|
|
_hOnClose :: OnCloseH m a
|
|
}
|
|
|
|
createServerApp ::
|
|
(MonadIO m, MC.MonadBaseControl IO m, LA.Forall (LA.Pure m), MonadWSLog m) =>
|
|
IO MetricsConfig ->
|
|
WSConnectionInitTimeout ->
|
|
WSServer a ->
|
|
PrometheusMetrics ->
|
|
-- | user provided handlers
|
|
WSHandlers m a ->
|
|
-- | aka WS.ServerApp
|
|
HasuraServerApp m
|
|
{-# INLINE createServerApp #-}
|
|
createServerApp getMetricsConfig wsConnInitTimeout (WSServer logger@(L.Logger writeLog) serverStatus) prometheusMetrics wsHandlers !ipAddress !pendingConn = do
|
|
wsId <- WSId <$> liftIO UUID.nextRandom
|
|
logWSLog logger $ WSLog wsId EConnectionRequest Nothing
|
|
-- NOTE: this timer is specific to `graphql-ws`. the server has to close the connection
|
|
-- if the client doesn't send a `connection_init` message within the timeout period
|
|
wsConnInitTimer <- liftIO $ getNewWSTimer (unrefine $ unWSConnectionInitTimeout wsConnInitTimeout)
|
|
status <- liftIO $ STM.readTVarIO serverStatus
|
|
case status of
|
|
AcceptingConns _ -> logUnexpectedExceptions $ do
|
|
onConnRes <- connHandler wsId reqHead ipAddress subProtocol
|
|
either (onReject wsId) (onAccept wsConnInitTimer wsId) onConnRes
|
|
ShuttingDown ->
|
|
onReject wsId shuttingDownReject
|
|
where
|
|
reqHead = WS.pendingRequest pendingConn
|
|
|
|
getSubProtocolHeader rhdrs =
|
|
filter (\(x, _) -> x == (CI.mk . B.pack $ "Sec-WebSocket-Protocol")) $ WS.requestHeaders rhdrs
|
|
|
|
subProtocol = case getSubProtocolHeader reqHead of
|
|
[sph] -> toWSSubProtocol . B.unpack . snd $ sph
|
|
_ -> Apollo -- NOTE: we default to the apollo implemenation
|
|
connHandler = _hOnConn wsHandlers
|
|
messageHandler = _hOnMessage wsHandlers
|
|
closeHandler = _hOnClose wsHandlers
|
|
|
|
logUnexpectedExceptions = flip catches handlers
|
|
where
|
|
handlers =
|
|
[ -- this exception occurs under the normal course of the web server running. Also fairly common during shutdowns.
|
|
-- Common suggestion is to gobble it.
|
|
-- Refer: https://hackage.haskell.org/package/warp-3.3.24/docs/src/Network.Wai.Handler.Warp.Settings.html#defaultShouldDisplayException
|
|
Handler $ \(_ :: TM.TimeoutThread) -> pure (),
|
|
Handler $ \(e :: Warp.InvalidRequest) -> do
|
|
writeLog $
|
|
L.UnstructuredLog L.LevelError $
|
|
fromString $
|
|
"Client exception: " <> show e
|
|
throwIO e,
|
|
Handler $ \(e :: SomeException) -> do
|
|
writeLog $
|
|
L.UnstructuredLog L.LevelError $
|
|
fromString $
|
|
"Unexpected exception raised in websocket. Please report this as a bug: " <> show e
|
|
throwIO e
|
|
]
|
|
|
|
shuttingDownReject =
|
|
WS.RejectRequest
|
|
503
|
|
"Service Unavailable"
|
|
[("Retry-After", "0")]
|
|
"Server is shutting down"
|
|
|
|
onReject wsId rejectRequest = do
|
|
liftIO $ WS.rejectRequestWith pendingConn rejectRequest
|
|
logWSLog logger $ WSLog wsId ERejected Nothing
|
|
|
|
onAccept wsConnInitTimer wsId (AcceptWith a acceptWithParams keepAlive onJwtExpiry) = do
|
|
conn <- liftIO $ WS.acceptRequestWith pendingConn acceptWithParams
|
|
logWSLog logger $ WSLog wsId EAccepted Nothing
|
|
sendQ <- liftIO STM.newTQueueIO
|
|
let !wsConn = WSConn wsId logger conn sendQ a
|
|
-- TODO there are many thunks here. Difficult to trace how much is retained, and
|
|
-- how much of that would be shared anyway.
|
|
-- Requires a fork of 'wai-websockets' and 'websockets', it looks like.
|
|
-- Adding `package` stanzas with -Xstrict -XStrictData for those two packages
|
|
-- helped, cutting the number of thunks approximately in half.
|
|
liftIO $ $assertNFHere wsConn -- so we don't write thunks to mutable vars
|
|
let whenAcceptingInsertConn = liftIO $
|
|
STM.atomically $ do
|
|
status <- STM.readTVar serverStatus
|
|
case status of
|
|
ShuttingDown -> pure ()
|
|
AcceptingConns connMap -> STMMap.insert wsConn wsId connMap
|
|
return status
|
|
|
|
-- ensure we clean up connMap even if an unexpected exception is raised from our worker
|
|
-- threads, or an async exception is raised somewhere in the body here:
|
|
bracket
|
|
whenAcceptingInsertConn
|
|
(onConnClose wsConn)
|
|
$ \case
|
|
ShuttingDown -> do
|
|
-- Bad luck, we were in the process of shutting the server down but a new
|
|
-- connection was accepted. Let's just close it politely
|
|
forceConnReconnect wsConn "shutting server down"
|
|
closeHandler wsConn
|
|
AcceptingConns _ -> do
|
|
let rcv = forever $ do
|
|
shouldCaptureVariables <- liftIO $ _mcAnalyzeQueryVariables <$> getMetricsConfig
|
|
-- Process all messages serially (important!), in a separate thread:
|
|
msg <-
|
|
liftIO $
|
|
-- Re-throw "receiveloop: resource vanished (Connection reset by peer)" :
|
|
-- https://github.com/yesodweb/wai/blob/master/warp/Network/Wai/Handler/Warp/Recv.hs#L112
|
|
-- as WS exception signaling cleanup below. It's not clear why exactly this gets
|
|
-- raised occasionally; I suspect an equivalent handler is missing from WS itself.
|
|
-- Regardless this should be safe:
|
|
handleJust (guard . E.isResourceVanishedError) (\() -> throw WS.ConnectionClosed) $
|
|
WS.receiveData conn
|
|
let messageLength = BL.length msg
|
|
censoredMessage =
|
|
MessageDetails
|
|
(SB.fromLBS (if shouldCaptureVariables then msg else "<censored>"))
|
|
messageLength
|
|
liftIO $
|
|
Prometheus.Counter.add
|
|
(pmWebSocketBytesReceived prometheusMetrics)
|
|
messageLength
|
|
logWSLog logger $ WSLog wsId (EMessageReceived censoredMessage) Nothing
|
|
messageHandler wsConn msg subProtocol
|
|
|
|
let send = forever $ do
|
|
WSQueueResponse msg wsInfo <- liftIO $ STM.atomically $ STM.readTQueue sendQ
|
|
let messageLength = BL.length msg
|
|
messageDetails = MessageDetails (SB.fromLBS msg) messageLength
|
|
liftIO $ WS.sendTextData conn msg
|
|
liftIO $
|
|
Prometheus.Counter.add
|
|
(pmWebSocketBytesSent prometheusMetrics)
|
|
messageLength
|
|
logWSLog logger $ WSLog wsId (EMessageSent messageDetails) wsInfo
|
|
|
|
-- withAsync lets us be very sure that if e.g. an async exception is raised while we're
|
|
-- forking that the threads we launched will be cleaned up. See also below.
|
|
LA.withAsync rcv $ \rcvRef -> do
|
|
LA.withAsync send $ \sendRef -> do
|
|
LA.withAsync (liftIO $ keepAlive wsConn) $ \keepAliveRef -> do
|
|
LA.withAsync (liftIO $ onJwtExpiry wsConn) $ \onJwtExpiryRef -> do
|
|
-- once connection is accepted, check the status of the timer, and if it's expired, close the connection for `graphql-ws`
|
|
timeoutStatus <- liftIO $ getWSTimerState wsConnInitTimer
|
|
when (timeoutStatus == Done && subProtocol == GraphQLWS) $
|
|
liftIO $
|
|
closeConnWithCode wsConn 4408 "Connection initialisation timed out"
|
|
|
|
-- terminates on WS.ConnectionException and JWT expiry
|
|
let waitOnRefs = [keepAliveRef, onJwtExpiryRef, rcvRef, sendRef]
|
|
-- withAnyCancel re-raises exceptions from forkedThreads, and is guarenteed to cancel in
|
|
-- case of async exceptions raised while blocking here:
|
|
try (LA.waitAnyCancel waitOnRefs) >>= \case
|
|
-- NOTE: 'websockets' is a bit of a rat's nest at the moment wrt
|
|
-- exceptions; for now handle all ConnectionException by closing
|
|
-- and cleaning up, see: https://github.com/jaspervdj/websockets/issues/48
|
|
Left (_ :: WS.ConnectionException) -> do
|
|
logWSLog logger $ WSLog (_wcConnId wsConn) ECloseReceived Nothing
|
|
-- this will happen when jwt is expired
|
|
Right _ -> do
|
|
logWSLog logger $ WSLog (_wcConnId wsConn) EJwtExpired Nothing
|
|
|
|
onConnClose wsConn = \case
|
|
ShuttingDown -> pure ()
|
|
AcceptingConns connMap -> do
|
|
liftIO $ STM.atomically $ STMMap.delete (_wcConnId wsConn) connMap
|
|
closeHandler wsConn
|
|
logWSLog logger $ WSLog (_wcConnId wsConn) EClosed Nothing
|
|
|
|
shutdown :: WSServer a -> IO ()
|
|
shutdown (WSServer (L.Logger writeLog) serverStatus) = do
|
|
writeLog $ L.debugT "Shutting websockets server down"
|
|
conns <- STM.atomically $ do
|
|
conns <- flushConnMap serverStatus
|
|
STM.writeTVar serverStatus ShuttingDown
|
|
return conns
|
|
closeAllWith (flip forceConnReconnect) "shutting server down" conns
|