func New(kin *kinfolk.Kin, topic string) *Tube {
t := &Tube{
lookup: make(map[string]int),
downstream: kinfolk.NewRotor(),
}
t.permXID = kinfolk.FolkXID{
X: circuit.PermRef(XTube{t}),
ID: lang.ComputeReceiverID(t),
}
t.folk = kin.Attach(topic, t.permXID)
go t.loop()
return t
}
