fix: stream creation when connections are nil (#63)

Author: richard-ramos

lsquic/context/client.nim

@@ -59,6 +59,7 @@ proc onConnClosed(conn: ptr lsquic_conn_t) {.cdecl.} =
       )
     quicClientConn.cancelPending()
     quicClientConn.onClose()
+    quicClientConn.lsquicConn = nil
     GC_unref(quicClientConn)
   lsquic_conn_set_ctx(conn, nil)
 

lsquic/context/context.nim

@@ -220,8 +220,13 @@ method dial*(
 ): Result[QuicConnection, string] {.base, gcsafe, raises: [].} =
   raiseAssert "dial not implemented"
 
-proc makeStream*(ctx: QuicContext, quicConn: QuicConnection) {.raises: [].} =
+proc makeStream*(
+    ctx: QuicContext, quicConn: QuicConnection
+) {.raises: [ConnectionClosedError].} =
   debug "Creating stream"
+  if quicConn.isNil or quicConn.lsquicConn.isNil:
+    debug "Cannot create stream: connection is nil"
+    raise newException(ConnectionClosedError, "connection closed")
   lsquic_conn_make_stream(quicConn.lsquicConn)
 
 proc onNewStream*(

lsquic/context/server.nim

@@ -43,6 +43,7 @@ proc onConnClosed(conn: ptr lsquic_conn_t) {.cdecl.} =
   if not conn_ctx.isNil:
     let quicConn = cast[QuicConnection](conn_ctx)
     quicConn.onClose()
+    quicConn.lsquicConn = nil
     GC_unref(quicConn)
   lsquic_conn_set_ctx(conn, nil)