QuicConnection fires event when closed

quic/transport/ngtcp2/connection/closedstate.nim

@@ -13,6 +13,9 @@ proc newClosedConnection*: ClosedConnection =
 
 {.push locks: "unknown".}
 
+method enter(state: ClosedConnection, connection: QuicConnection) =
+  connection.closed.fire()
+
 method ids(state: ClosedConnection): seq[ConnectionId] =
   @[]
 

quic/transport/quicconnection.nim

@@ -7,8 +7,9 @@ type
   QuicConnection* = ref object
     state: ConnectionState
     outgoing*: AsyncQueue[Datagram]
-    handshake*: AsyncEvent
     incoming*: AsyncQueue[Stream]
+    handshake*: AsyncEvent
+    closed*: AsyncEvent
   ConnectionState* = ref object of RootObj
   IdCallback* = proc(id: ConnectionId)
   ConnectionError* = object of IOError
@@ -51,8 +52,9 @@ proc newQuicConnection*(state: ConnectionState): QuicConnection =
   let connection = QuicConnection(
     state: state,
     outgoing: newAsyncQueue[Datagram](),
+    incoming: newAsyncQueue[Stream](),
     handshake: newAsyncEvent(),
-    incoming: newAsyncQueue[Stream]()
+    closed: newAsyncEvent()
   )
   state.enter(connection)
   connection

tests/quic/testQuicConnection.nim

@@ -71,6 +71,11 @@ suite "quic connection":
     await server.handshake.wait()
     check newId != ConnectionId.default
 
+  asynctest "fires event when closed":
+    let client = newQuicClientConnection(zeroAddress, zeroAddress)
+    client.drop()
+    check client.closed.isSet()
+
   asynctest "raises ConnectionError when closed":
     let connection = newQuicClientConnection(zeroAddress, zeroAddress)
     connection.drop()