// Create a new Acknowledgement. Must be called by a leader. This
// call assumes all the pieces are in place to create a new acknowledgement
func (s *State) NewAck(msg interfaces.IMsg) interfaces.IMsg {
vmIndex := msg.GetVMIndex()
msg.SetLeaderChainID(s.IdentityChainID)
ack := new(messages.Ack)
ack.DBHeight = s.LLeaderHeight
ack.VMIndex = vmIndex
ack.Minute = byte(s.ProcessLists.Get(s.LLeaderHeight).VMs[vmIndex].LeaderMinute)
ack.Timestamp = s.GetTimestamp()
ack.SaltNumber = s.GetSalt(ack.Timestamp)
copy(ack.Salt[:8], s.Salt.Bytes()[:8])
ack.MessageHash = msg.GetMsgHash()
ack.LeaderChainID = s.IdentityChainID
listlen := len(s.LeaderPL.VMs[vmIndex].List)
if listlen == 0 {
ack.Height = 0
ack.SerialHash = ack.MessageHash
} else {
last := s.LeaderPL.GetAckAt(vmIndex, listlen-1)
ack.Height = last.Height + 1
ack.SerialHash, _ = primitives.CreateHash(last.MessageHash, ack.MessageHash)
}
ack.Sign(s)
return ack
}
