[websockets] some refactoring (split to smaller modules)

README.md

@@ -390,3 +390,11 @@ Maybe you need to change the port to 5433 for database connection in your gargan
 
 
 
+## `haskell-language-server`
+
+If you want to use `haskell-language-server` for GHC 9.4.7, install it
+with `ghcup`:
+```shell
+ghcup compile hls --version 2.7.0.0 --ghc 9.4.7
+```
+https://haskell-language-server.readthedocs.io/en/latest/installation.html

gargantext.cabal

@@ -171,7 +171,9 @@ library
       Gargantext.Core.AsyncUpdates.CentralExchange.Types
       Gargantext.Core.AsyncUpdates.Constants
       Gargantext.Core.AsyncUpdates.Dispatcher
+      Gargantext.Core.AsyncUpdates.Dispatcher.Subscriptions
       Gargantext.Core.AsyncUpdates.Dispatcher.Types
+      Gargantext.Core.AsyncUpdates.Dispatcher.WebSocket
       Gargantext.Core.AsyncUpdates.Nanomsg
       Gargantext.Core.Mail.Types
       Gargantext.Core.Methods.Similarities

src/Gargantext/API/Routes/Named.hs

@@ -28,7 +28,7 @@ import Gargantext.API.GraphQL
 import Gargantext.API.Routes.Named.Private
 import Gargantext.API.Routes.Named.Public
 import Gargantext.API.Routes.Types
-import Gargantext.Core.AsyncUpdates.Dispatcher qualified as Dispatcher
+import Gargantext.Core.AsyncUpdates.Dispatcher.WebSocket qualified as Dispatcher
 import Servant.API ((:>), (:-), JSON, ReqBody, Post, Get, QueryParam)
 import Servant.API.Description (Summary)
 import Servant.API.NamedRoutes

src/Gargantext/API/Server/Named.hs

@@ -22,7 +22,7 @@ import Gargantext.API.Server.Named.Public (serverPublicGargAPI)
 import Gargantext.API.Routes.Named
 import Gargantext.API.Swagger (swaggerDoc)
 import Gargantext.API.ThrowAll (serverPrivateGargAPI)
-import Gargantext.Core.AsyncUpdates.Dispatcher qualified as Dispatcher
+import Gargantext.Core.AsyncUpdates.Dispatcher.WebSocket qualified as Dispatcher
 import Gargantext.Database.Prelude (hasConfig)
 import Gargantext.Prelude hiding (Handler, catch)
 import Gargantext.Prelude.Config (gc_url_backend_api)

src/Gargantext/Core/AsyncUpdates/CentralExchange.hs

@@ -16,16 +16,14 @@ https://dev.sub.gargantext.org/#/share/Notes/187918
 
 module Gargantext.Core.AsyncUpdates.CentralExchange where
 
--- import Control.Concurrent (threadDelay)
 import Control.Concurrent.Async qualified as Async
 import Control.Concurrent.STM.TChan qualified as TChan
 import Data.Aeson qualified as Aeson
-import Data.ByteString.Char8 qualified as C
 import Data.ByteString.Lazy qualified as BSL
 import Gargantext.Core.AsyncUpdates.CentralExchange.Types
 import Gargantext.Core.AsyncUpdates.Constants (ceBind, ceConnect, dispatcherConnect)
--- import Gargantext.Core.AsyncUpdates.Nanomsg (withSafeSocket)
 import Gargantext.Prelude
+import Gargantext.System.Logging (LogLevel(DEBUG), withLogger, logMsg)
 import Nanomsg (Pull(..), Push(..), bind, connect, recvMalloc, send, withSocket)
     
 {-
@@ -58,19 +56,20 @@ gServer = do
         forever $ do
           -- putText "[central_exchange] receiving"
           r <- recvMalloc s 1024
-          C.putStrLn $ "[central_exchange] " <> r
+          -- C.putStrLn $ "[central_exchange] " <> r
           atomically $ TChan.writeTChan tChan r
   where
     worker s_dispatcher tChan = do
+      withLogger () $ \ioLogger -> do
         forever $ do
           r <- atomically $ TChan.readTChan tChan
           case Aeson.decode (BSL.fromStrict r) of
             Just ujp@(UpdateJobProgress _jId _jobLog) -> do
-            putText $ "[central_exchange] " <> show ujp
+              logMsg ioLogger DEBUG $ "[central_exchange] " <> show ujp
               -- send the same message that we received
               send s_dispatcher r
             Just (UpdateTreeFirstLevel node_id) -> do
-            putText $ "[central_exchange] update tree: " <> show node_id
+              logMsg ioLogger DEBUG $ "[central_exchange] update tree: " <> show node_id
               -- putText $ "[central_exchange] sending that to the dispatcher: " <> show node_id
               -- To make this more robust, use withAsync so we don't
               -- block the main thread (send is blocking)
@@ -87,7 +86,7 @@ gServer = do
               -- process, independent of the server.
               -- send the same message that we received
               send s_dispatcher r
-          _ -> putText $ "[central_exchange] unknown message"
+            _ -> logMsg ioLogger DEBUG $ "[central_exchange] unknown message"
       
 
 notify :: CEMessage -> IO ()

src/Gargantext/Core/AsyncUpdates/CentralExchange/Types.hs

@@ -23,7 +23,6 @@ import Data.ByteString.Lazy qualified as BSL
 import Gargantext.API.Admin.Orchestrator.Types (JobLog)
 import Gargantext.Core.Types (NodeId)
 import Gargantext.Prelude
--- import Gargantext.Utils.Jobs.Map qualified as JM
 import Prelude qualified
 import Servant.Job.Core (Safety(Safe))
 import Servant.Job.Types (JobID)

src/Gargantext/Core/AsyncUpdates/Dispatcher.hs

@@ -15,42 +15,21 @@ https://dev.sub.gargantext.org/#/share/Notes/187918
 -}
 
 {-# LANGUAGE TypeOperators #-}
-{-# OPTIONS_GHC -fno-warn-unused-matches -fno-warn-unused-imports #-}
     
 module Gargantext.Core.AsyncUpdates.Dispatcher where
 
 import Control.Concurrent.Async qualified as Async
 import Control.Concurrent.STM.TChan qualified as TChan
-import Control.Lens (view)
-import Data.Aeson ((.:), (.=))
 import Data.Aeson qualified as Aeson
-import Data.Aeson.Types (prependFailure, typeMismatch)
-import Data.ByteString.Char8 qualified as C
 import Data.ByteString.Lazy qualified as BSL
-import Data.List (nubBy)
 import DeferredFolds.UnfoldlM qualified as UnfoldlM
-import Data.UUID.V4 as UUID
-import Gargantext.API.Admin.Auth.Types (AuthenticatedUser(_auth_user_id))
-import Gargantext.API.Admin.EnvTypes (env_dispatcher)
-import Gargantext.API.Admin.Types (jwtSettings, Settings, jwtSettings, HasSettings(settings))
-import Gargantext.API.Prelude (IsGargServer)
 import Gargantext.Core.AsyncUpdates.CentralExchange.Types qualified as CETypes
 import Gargantext.Core.AsyncUpdates.Constants as AUConstants
 import Gargantext.Core.AsyncUpdates.Dispatcher.Types
-import Gargantext.Core.Types (NodeId, UserId)
 import Gargantext.Prelude
 import Gargantext.System.Logging (LogLevel(DEBUG), withLogger, logMsg)
--- import Gargantext.Utils.Jobs.Monad (MonadJobStatus(getLatestJobStatus))
-import GHC.Conc (TVar, newTVarIO, readTVar, writeTVar)
 import Nanomsg (Pull(..), bind, recvMalloc, withSocket)
 import Network.WebSockets qualified as WS
-import Protolude.Base (Show(showsPrec))
-import Servant
--- import Servant.API.NamedRoutes ((:-))
-import Servant.API.WebSocket qualified as WS
-import Servant.Auth.Server (verifyJWT)
-import Servant.Server.Generic (AsServer, AsServerT)
-import Servant.Swagger.UI
 import StmContainers.Set as SSet
 
 {-
@@ -76,134 +55,6 @@ dispatcher = do
                     , d_ce_listener   = d_ce_listener }
 
 
--- | TODO Allow only 1 topic subscription per connection. It doesn't
--- | make sense to send multiple notifications of the same type to the
--- | same connection.
-insertSubscription :: SSet.Set Subscription -> Subscription -> IO ()
-insertSubscription subscriptions sub = do
-  atomically $ SSet.insert sub subscriptions
-    -- s <- readTVar subscriptions
-    -- let ss = nubBy eqSub $ s <> [sub]
-    -- writeTVar subscriptions ss
-    -- -- pure ss
-    -- pure ()
-     
-removeSubscription :: SSet.Set Subscription -> Subscription -> IO ()
-removeSubscription subscriptions sub = do
-  atomically $ SSet.delete sub subscriptions
-    -- s <- readTVar subscriptions
-    -- let ss = filter (\sub' -> not $ sub `eqSub` sub') s
-    -- writeTVar subscriptions ss
-    -- pure ss
-   
-removeSubscriptionsForWSKey :: SSet.Set Subscription -> WSKeyConnection -> IO ()
-removeSubscriptionsForWSKey subscriptions ws = do
-  atomically $ do
-    let toDelete = UnfoldlM.filter (\sub -> return $ subKey sub == wsKey ws) $ SSet.unfoldlM subscriptions
-    UnfoldlM.mapM_ (\sub -> SSet.delete sub subscriptions) toDelete
-  -- atomically $ do
-  --   s <- readTVar subscriptions
-  --   let ss = filter (\sub -> subKey sub /= wsKey ws) s
-  --   writeTVar subscriptions ss
-  --   pure ss
-    
-newtype WSAPI mode = WSAPI {
-    wsAPIServer :: mode :- "ws" :> Summary "WebSocket endpoint" :> WS.WebSocketPending
-  } deriving Generic
-
-
-wsServer :: ( IsGargServer env err m, HasDispatcher env, HasSettings env ) => WSAPI (AsServerT m)
-wsServer = WSAPI { wsAPIServer = streamData }
-  where
-    streamData :: ( IsGargServer env err m, HasDispatcher env, HasSettings env )
-               => WS.PendingConnection -> m ()
-    streamData pc = do
-      authSettings <- view settings
-      d <- view hasDispatcher
-      let subscriptions = d_subscriptions d
-      let reqHead = WS.pendingRequest pc
-      -- WebSocket specification says that a pending request should send
-      -- some unique, Sec-WebSocket-Key string. We use this to compare
-      -- connections (WS.Connection doesn't implement an Eq instance).
-      let mKey = head $ filter (\(k, _) -> k == "Sec-WebSocket-Key") $ WS.requestHeaders reqHead
-      let key' = snd $ fromMaybe (panicTrace "Sec-WebSocket-Key not found!") mKey
-      -- Unfortunately, a single browsers sends the same
-      -- Sec-WebSocket-Key so we want to make that even more unique.
-      uuid <- liftBase $ UUID.nextRandom
-      let key = key' <> "-" <> show uuid
-      -- liftBase $ putText $ show $ WS.requestHeaders reqHead
-      c <- liftBase $ WS.acceptRequest pc
-      let ws = WSKeyConnection (key, c)
-      _ <- liftBase $ Async.concurrently (wsLoop authSettings subscriptions ws) (pingLoop ws)
-      -- _ <- liftIO $ Async.withAsync (pure ()) (\_ -> wsLoop ws)
-      pure ()
-  
-    -- | Send a ping control frame periodically, otherwise the
-    -- | connection is dropped. NOTE that 'onPing' message is not
-    -- | supported in the JS API: either the browser supports this or
-    -- | not:
-    -- | https://stackoverflow.com/questions/10585355/sending-websocket-ping-pong-frame-from-browser
-    pingLoop ws = do
-      forever $ do
-        -- WS.sendDataMessage (wsConn ws) (WS.Text (Aeson.encode Ping) Nothing)
-        WS.sendPing (wsConn ws) ("" :: Text)
-        threadDelay $ 10 * 1000000
-      
-    wsLoop authSettings subscriptions ws = flip finally disconnect $ do
-      withLogger () $ \ioLogger -> do
-        logMsg ioLogger DEBUG "[wsLoop] connecting"
-        wsLoop' CUPublic ioLogger
-  
-      where
-        wsLoop' user ioLogger = do
-          dm <- WS.receiveDataMessage (wsConn ws)
-          
-          newUser <- case dm of
-            WS.Text dm' _ -> do
-              case Aeson.decode dm' of
-                Nothing -> do
-                  logMsg ioLogger DEBUG $ "[wsLoop] unknown message: " <> show dm'
-                  return user
-                Just (WSSubscribe topic) -> do
-                  -- TODO Fix s_connected_user based on header
-                  let sub = Subscription { s_connected_user = user
-                                         , s_ws_key_connection = ws
-                                         , s_topic = topic }
-                  _ss <- insertSubscription subscriptions sub
-                  -- putText $ "[wsLoop] subscriptions: " <> show (showSub <$> ss)
-                  return user
-                Just (WSUnsubscribe topic) -> do
-                  let sub = Subscription { s_connected_user = user
-                                         , s_ws_key_connection = ws
-                                         , s_topic = topic }
-                  _ss <- removeSubscription subscriptions sub
-                  -- putText $ "[wsLoop] subscriptions: " <> show (showSub <$> ss)
-                  return user
-                Just (WSAuthorize token) -> do
-                  let jwtS = authSettings ^. jwtSettings
-                  mUser <- liftBase $ verifyJWT jwtS (encodeUtf8 token)
-  
-                  logMsg ioLogger DEBUG $ "[wsLoop] authorized user: " <> show mUser
-  
-                  -- TODO Update my subscriptions!
-  
-                  return $ fromMaybe user (CUUser . _auth_user_id <$> mUser)
-                Just WSDeauthorize -> do
-                  -- TODO Update my subscriptions!
-                  pure CUPublic
-            _ -> do
-              logMsg ioLogger DEBUG "[wsLoop] binary ws messages not supported"
-              return user
-            
-          wsLoop' newUser ioLogger
-  
-        disconnect = do
-          withLogger () $ \ioLogger -> do
-            logMsg ioLogger DEBUG "[wsLoop] disconnecting..."
-            _ss <- removeSubscriptionsForWSKey subscriptions ws
-            -- putText $ "[wsLoop] subscriptions: " <> show (show <$> ss)
-            return ()
-
     
 -- | This is a nanomsg socket listener. We want to read the messages
 -- | as fast as possible and then process them gradually in a separate
@@ -218,14 +69,14 @@ dispatcher_listener subscriptions = do
     -- NOTE I'm not sure that we need more than 1 worker here, but in
     -- theory, the worker can perform things like user authentication,
     -- DB queries etc so it can be slow sometimes.
-    void $ Async.concurrently (Async.replicateConcurrently 5 $ worker s tChan) $ do
+    void $ Async.concurrently (Async.replicateConcurrently 5 $ worker tChan) $ do
       forever $ do
         -- putText "[dispatcher_listener] receiving"
         r <- recvMalloc s 1024
         -- C.putStrLn $ "[dispatcher_listener] " <> r
         atomically $ TChan.writeTChan tChan r
   where
-    worker s tChan = do
+    worker tChan = do
       -- tId <- myThreadId
       
       forever $ do
@@ -257,11 +108,11 @@ dispatcher_listener subscriptions = do
       let topic = s_topic sub
       notification <-
             case ceMessage of
-              CETypes.UpdateJobProgress jId jobLog -> do
+              CETypes.UpdateJobProgress _jId jobLog -> do
                 -- js <- getLatestJobStatus jId
                 -- putText $ "[sendNotification] latestJobStatus" js
                 pure $ Notification topic (MJobProgress jobLog)
-              CETypes.UpdateTreeFirstLevel nodeId -> pure $ Notification topic MEmpty
+              CETypes.UpdateTreeFirstLevel _nodeId -> pure $ Notification topic MEmpty
       -- TODO send the same thing to everyone for now, this should be
       -- converted to notifications
       WS.sendDataMessage (wsConn ws) (WS.Text (Aeson.encode notification) Nothing)

src/Gargantext/Core/AsyncUpdates/Dispatcher/Subscriptions.hs

+{-|
+Module      : Gargantext.Core.AsyncUpdates.Dispatcher.Subscriptions
+Description : Dispatcher (manage websocket subscriptions)
+Copyright   : (c) CNRS, 2017-Present
+License     : AGPL + CECILL v3
+Maintainer  : team@gargantext.org
+Stability   : experimental
+Portability : POSIX
+
+https://gitlab.iscpif.fr/gargantext/haskell-gargantext/issues/341
+
+Docs:
+https://dev.sub.gargantext.org/#/share/Notes/187918
+    
+-}
+
+    
+module Gargantext.Core.AsyncUpdates.Dispatcher.Subscriptions where
+
+import DeferredFolds.UnfoldlM qualified as UnfoldlM
+import Gargantext.Core.AsyncUpdates.Dispatcher.Types
+import Gargantext.Prelude
+import StmContainers.Set as SSet
+
+
+-- | TODO Allow only 1 topic subscription per connection. It doesn't
+-- | make sense to send multiple notifications of the same type to the
+-- | same connection.
+insertSubscription :: SSet.Set Subscription -> Subscription -> IO ()
+insertSubscription subscriptions sub = do
+  atomically $ SSet.insert sub subscriptions
+    -- s <- readTVar subscriptions
+    -- let ss = nubBy eqSub $ s <> [sub]
+    -- writeTVar subscriptions ss
+    -- -- pure ss
+    -- pure ()
+     
+removeSubscription :: SSet.Set Subscription -> Subscription -> IO ()
+removeSubscription subscriptions sub = do
+  atomically $ SSet.delete sub subscriptions
+    -- s <- readTVar subscriptions
+    -- let ss = filter (\sub' -> not $ sub `eqSub` sub') s
+    -- writeTVar subscriptions ss
+    -- pure ss
+   
+removeSubscriptionsForWSKey :: SSet.Set Subscription -> WSKeyConnection -> IO ()
+removeSubscriptionsForWSKey subscriptions ws = do
+  atomically $ do
+    let toDelete = UnfoldlM.filter (\sub -> return $ subKey sub == wsKey ws) $ SSet.unfoldlM subscriptions
+    UnfoldlM.mapM_ (\sub -> SSet.delete sub subscriptions) toDelete
+  -- atomically $ do
+  --   s <- readTVar subscriptions
+  --   let ss = filter (\sub -> subKey sub /= wsKey ws) s
+  --   writeTVar subscriptions ss
+  --   pure ss

src/Gargantext/Core/AsyncUpdates/Dispatcher/Types.hs

@@ -14,7 +14,6 @@ https://dev.sub.gargantext.org/#/share/Notes/187918
     
 -}
 
-{-# LANGUAGE TypeOperators #-}
 {-# OPTIONS_GHC -fno-warn-unused-matches -fno-warn-unused-imports #-}
     
 module Gargantext.Core.AsyncUpdates.Dispatcher.Types where

src/Gargantext/Core/AsyncUpdates/Dispatcher/WebSocket.hs

+{-|
+Module      : Gargantext.Core.AsyncUpdates.Dispatcher.WebSocket
+Description : Dispatcher websocket server
+Copyright   : (c) CNRS, 2017-Present
+License     : AGPL + CECILL v3
+Maintainer  : team@gargantext.org
+Stability   : experimental
+Portability : POSIX
+
+https://gitlab.iscpif.fr/gargantext/haskell-gargantext/issues/341
+
+Docs:
+https://dev.sub.gargantext.org/#/share/Notes/187918
+    
+-}
+
+{-# LANGUAGE TypeOperators #-}
+    
+module Gargantext.Core.AsyncUpdates.Dispatcher.WebSocket where
+
+import Control.Concurrent.Async qualified as Async
+import Control.Lens (view)
+import Data.Aeson qualified as Aeson
+import Data.UUID.V4 as UUID
+import Gargantext.API.Admin.Auth.Types (AuthenticatedUser(_auth_user_id))
+import Gargantext.API.Admin.Types (HasSettings(settings), Settings, jwtSettings)
+import Gargantext.API.Prelude (IsGargServer)
+import Gargantext.Core.AsyncUpdates.Dispatcher.Subscriptions
+import Gargantext.Core.AsyncUpdates.Dispatcher.Types
+import Gargantext.Prelude
+import Gargantext.System.Logging (LogLevel(DEBUG), logMsg, withLogger)
+import Network.WebSockets qualified as WS
+import Servant
+import Servant.API.WebSocket qualified as WS (WebSocketPending)
+import Servant.Auth.Server (verifyJWT)
+import Servant.Server.Generic (AsServerT)
+import StmContainers.Set as SSet
+
+    
+newtype WSAPI mode = WSAPI {
+    wsAPIServer :: mode :- "ws" :> Summary "WebSocket endpoint" :> WS.WebSocketPending
+  } deriving Generic
+
+
+wsServer :: ( IsGargServer env err m, HasDispatcher env, HasSettings env ) => WSAPI (AsServerT m)
+wsServer = WSAPI { wsAPIServer = streamData }
+  where
+    streamData :: ( IsGargServer env err m, HasDispatcher env, HasSettings env )
+               => WS.PendingConnection -> m ()
+    streamData pc = do
+      authSettings <- view settings
+      d <- view hasDispatcher
+      let subscriptions = d_subscriptions d
+      key <- getWSKey pc
+      c <- liftBase $ WS.acceptRequest pc
+      let ws = WSKeyConnection (key, c)
+      _ <- liftBase $ Async.concurrently (wsLoop authSettings subscriptions ws) (pingLoop ws)
+      -- _ <- liftIO $ Async.withAsync (pure ()) (\_ -> wsLoop ws)
+      pure ()
+
+  
+-- | Send a ping control frame periodically, otherwise the
+-- | connection is dropped. NOTE that 'onPing' message is not
+-- | supported in the JS API: either the browser supports this or
+-- | not:
+-- | https://stackoverflow.com/questions/10585355/sending-websocket-ping-pong-frame-from-browser
+pingLoop :: WSKeyConnection -> IO ()
+pingLoop ws = do
+  forever $ do
+    -- WS.sendDataMessage (wsConn ws) (WS.Text (Aeson.encode Ping) Nothing)
+    WS.sendPing (wsConn ws) ("" :: Text)
+    threadDelay $ 10 * 1000000
+
+      
+wsLoop :: Settings -> SSet.Set Subscription -> WSKeyConnection -> IO a
+wsLoop authSettings subscriptions ws = flip finally disconnect $ do
+  withLogger () $ \ioLogger -> do
+    logMsg ioLogger DEBUG "[wsLoop] connecting"
+    wsLoop' CUPublic ioLogger
+
+  where
+    wsLoop' user ioLogger = do
+      dm <- WS.receiveDataMessage (wsConn ws)
+      
+      newUser <- case dm of
+        WS.Text dm' _ -> do
+          case Aeson.decode dm' of
+            Nothing -> do
+              logMsg ioLogger DEBUG $ "[wsLoop] unknown message: " <> show dm'
+              return user
+            Just (WSSubscribe topic) -> do
+              -- TODO Fix s_connected_user based on header
+              let sub = Subscription { s_connected_user = user
+                                     , s_ws_key_connection = ws
+                                     , s_topic = topic }
+              _ss <- insertSubscription subscriptions sub
+              -- putText $ "[wsLoop] subscriptions: " <> show (showSub <$> ss)
+              return user
+            Just (WSUnsubscribe topic) -> do
+              let sub = Subscription { s_connected_user = user
+                                     , s_ws_key_connection = ws
+                                     , s_topic = topic }
+              _ss <- removeSubscription subscriptions sub
+              -- putText $ "[wsLoop] subscriptions: " <> show (showSub <$> ss)
+              return user
+            Just (WSAuthorize token) -> do
+              let jwtS = authSettings ^. jwtSettings
+              mUser <- liftBase $ verifyJWT jwtS (encodeUtf8 token)
+
+              logMsg ioLogger DEBUG $ "[wsLoop] authorized user: " <> show mUser
+
+              -- TODO Update my subscriptions!
+
+              return $ fromMaybe user (CUUser . _auth_user_id <$> mUser)
+            Just WSDeauthorize -> do
+              -- TODO Update my subscriptions!
+              pure CUPublic
+        _ -> do
+          logMsg ioLogger DEBUG "[wsLoop] binary ws messages not supported"
+          return user
+        
+      wsLoop' newUser ioLogger
+
+    disconnect = do
+      withLogger () $ \ioLogger -> do
+        logMsg ioLogger DEBUG "[wsLoop] disconnecting..."
+        _ss <- removeSubscriptionsForWSKey subscriptions ws
+        -- putText $ "[wsLoop] subscriptions: " <> show (show <$> ss)
+        return ()
+
+    
+        
+getWSKey :: MonadBase IO m => WS.PendingConnection -> m ByteString
+getWSKey pc = do
+  let reqHead = WS.pendingRequest pc
+  -- WebSocket specification says that a pending request should send
+  -- some unique, Sec-WebSocket-Key string. We use this to compare
+  -- connections (WS.Connection doesn't implement an Eq instance).
+  let mKey = head $ filter (\(k, _) -> k == "Sec-WebSocket-Key") $ WS.requestHeaders reqHead
+  let key' = snd $ fromMaybe (panicTrace "Sec-WebSocket-Key not found!") mKey
+  -- Unfortunately, a single browsers sends the same
+  -- Sec-WebSocket-Key so we want to make that even more unique.
+  uuid <- liftBase $ UUID.nextRandom
+  let key = key' <> "-" <> show uuid
+  -- liftBase $ putText $ show $ WS.requestHeaders reqHead
+
+  pure key