quic: fix idle timeout

After ngtcp2 being updated, `ngtcp2_conn_get_idle_timeout` is renamed as
`ngtcp2_conn_get_idle_expiry` which returns `ngtcp2_tstamp` instead of
`ngtcp2_duration`.

Refs: https://github.com/ngtcp2/ngtcp2/blob/6f40668cdce7db7c043d3a80c07f379841d8c51e/lib/ngtcp2_conn.c#L8604

src/node_quic_session.cc

@@ -1527,7 +1527,9 @@ void QuicSession::StreamReset(
 
 void QuicSession::UpdateIdleTimer() {
   CHECK_NOT_NULL(idle_);
-  uint64_t timeout = ngtcp2_conn_get_idle_expiry(Connection()) / 1000000UL;
+  uint64_t timeout = (ngtcp2_conn_get_idle_expiry(Connection()) - uv_hrtime()) / 1000000UL;
+  if (timeout < 0)
+    timeout = 0;
   Debug(this, "Updating idle timeout to %" PRIu64, timeout);
   idle_->Update(timeout);
 }

test/parallel/test-quic-idle-timeout.js

@@ -71,10 +71,12 @@ const idleTimeout = common.platformTimeout(1000);
     idleTimeout,
   });
 
-  server.on('session', common.mustCall(() => {
-    client.close();
-    server.close();
-    assert(Date.now() - start < idleTimeout + error);
+  server.on('session', common.mustCall((serverSession) => {
+    serverSession.on('close', common.mustCall(() => {
+      client.close();
+      server.close();
+      assert(Date.now() - start < idleTimeout + error);
+    }));
   }));
 
   server.on('ready', common.mustCall(() => {