cluster_grpc example error

[CoreELEE]

room is a backend servers, Pitaya Doc

Backend sessions
Backend sessions have access to the sessions through the handler’s methods, but they have some limitations and special characteristics. Changes to session variables must be pushed to the frontend server by calling s.PushToFront (this is not needed for s.Bind operations), setting callbacks to session lifecycle operations is also not allowed. One can also not retrieve a session by user ID from a backend server.

In the examples/demo/cluster_grpc/services/room.go

// Join room
func (r *Room) Join(ctx context.Context) (*JoinResponse, error) {
s := r.app.GetSessionFromCtx(ctx)
err := r.app.GroupAddMember(ctx, "room", s.UID())
if err != nil {
return nil, err
}
members, err := r.app.GroupMembers(ctx, "room")
if err != nil {
return nil, err
}
s.Push("onMembers", &AllMembers{Members: members})
r.app.GroupBroadcast(ctx, "connector", "room", "onNewUser", &NewUser{Content: fmt.Sprintf("New user: %d", s.ID())})
err = s.OnClose(func() {
r.app.GroupRemoveMember(ctx, "room", s.UID())
})
if err != nil {
return nil, err
}
return &JoinResponse{Result: "success"}, nil
}

s.OnCloseThis will cause an error.
{"code":"PIT-000","msg":"onclose callbacks are not allowed on backend servers"}

[lyh1091106900]

This is indeed a bug in the demo, probably a case of copy-paste, which the author has not run