fix(websocket): avoid asyncSpawn

libp2p/transports/wstransport.nim

@@ -135,6 +135,7 @@ type WsTransport* = ref object of Transport
   httpservers: seq[HttpServer]
   wsserver: WSServer
   connections: array[Direction, seq[WsStream]]
+  connectionCleanupFuts: seq[Future[void]]
   acceptLoop: Future[void]
   handshakeFuts: seq[Future[void]]
   acceptResults: AsyncQueue[Connection]
@@ -408,26 +409,29 @@ method stop*(self: WsTransport) {.async: (raises: []).} =
     await procCall Transport(self).stop() # call base
 
     var toWait: seq[Future[void]]
-    if not isNil(self.acceptLoop) and not self.acceptLoop.finished:
+    if not self.acceptLoop.isNil:
       toWait.add(self.acceptLoop.cancelAndWait())
 
     for fut in self.handshakeFuts:
-      if not fut.finished:
-        toWait.add(fut.cancelAndWait())
+      toWait.add(fut.cancelAndWait())
 
     for server in self.httpservers:
       server.stop()
       toWait.add(server.closeWait())
 
     await allFutures(toWait)
 
-    discard await allFinished(
+    # stop connections and wait for them to be closed
+    await allFutures(
       self.connections[Direction.In].mapIt(it.close()) &
         self.connections[Direction.Out].mapIt(it.close())
     )
+    self.connectionCleanupFuts.keepItIf(not it.finished)
+    await allFutures(self.connectionCleanupFuts)
 
     self.httpservers = @[]
     self.handshakeFuts = @[]
+    self.connectionCleanupFuts = @[]
     self.acceptLoop = nil
     trace "Transport stopped"
   except CatchableError as e:
@@ -469,7 +473,9 @@ proc connHandler(
     self.connections[dir].keepItIf(it != conn)
     trace "Cleaned up client"
 
-  asyncSpawn onClose()
+  self.connectionCleanupFuts.keepItIf(not it.finished)
+  self.connectionCleanupFuts.add(onClose())
+
   return conn
 
 method accept*(