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nano_tx.go
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nano_tx.go
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package txs
import (
"bytes"
"time"
"github.com/spacemeshos/go-spacemesh/common/types"
"github.com/spacemeshos/go-spacemesh/hash"
"github.com/spacemeshos/go-spacemesh/log"
)
// NanoTX represents minimal info about a transaction for the conservative cache/mempool.
type NanoTX struct {
types.TxHeader
ID types.TransactionID
Received time.Time
Block types.BlockID
Layer types.LayerID
}
// NewNanoTX converts a NanoTX instance from a MeshTransaction.
func NewNanoTX(mtx *types.MeshTransaction) *NanoTX {
return &NanoTX{
ID: mtx.ID,
TxHeader: *mtx.TxHeader,
Received: mtx.Received,
Block: mtx.BlockID,
Layer: mtx.LayerID,
}
}
// MaxSpending returns the maximal amount a transaction can spend.
func (n *NanoTX) MaxSpending() uint64 {
return n.Spending()
}
func (n *NanoTX) combinedHash(blockSeed []byte) []byte {
hash := hash.New()
hash.Write(blockSeed)
hash.Write(n.ID.Bytes())
return hash.Sum(nil)
}
// Better returns true if this transaction takes priority than `other`.
// when the block seed is non-empty, this tx is being considered for a block.
// the block seed then is used to tie-break (deterministically) transactions for
// the same account/nonce.
func (n *NanoTX) Better(other *NanoTX, blockSeed []byte) bool {
if n.Principal != other.Principal ||
n.Nonce != other.Nonce {
log.Panic("invalid arguments")
}
if n.Fee() > other.Fee() {
return true
}
if n.Fee() == other.Fee() {
if len(blockSeed) > 0 {
return bytes.Compare(n.combinedHash(blockSeed), other.combinedHash(blockSeed)) < 0
}
return n.Received.Before(other.Received)
}
return false
}
// UpdateLayerMaybe updates the layer of a transaction if it's lower than the current value.
func (n *NanoTX) UpdateLayerMaybe(lid types.LayerID, bid types.BlockID) {
if n.Layer == 0 || lid.Before(n.Layer) {
n.UpdateLayer(lid, bid)
}
}
// UpdateLayer updates the layer of a transaction.
func (n *NanoTX) UpdateLayer(lid types.LayerID, bid types.BlockID) {
n.Layer = lid
n.Block = bid
}