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transaction.go
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transaction.go
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package types
import (
"fmt"
"strings"
"github.com/spacemeshos/ed25519"
"github.com/spacemeshos/go-spacemesh/log"
"github.com/spacemeshos/go-spacemesh/signing"
)
// TransactionID is a 32-byte sha256 sum of the transaction, used as an identifier.
type TransactionID Hash32
// Hash32 returns the TransactionID as a Hash32.
func (id TransactionID) Hash32() Hash32 {
return Hash32(id)
}
// ShortString returns a the first 10 characters of the ID, for logging purposes.
func (id TransactionID) ShortString() string {
return id.Hash32().ShortString()
}
// String returns a hexadecimal representation of the TransactionID with "0x" prepended, for logging purposes.
// It implements the fmt.Stringer interface.
func (id TransactionID) String() string {
return id.Hash32().String()
}
// Bytes returns the TransactionID as a byte slice.
func (id TransactionID) Bytes() []byte {
return id[:]
}
// Field returns a log field. Implements the LoggableField interface.
func (id TransactionID) Field() log.Field { return log.FieldNamed("tx_id", id.Hash32()) }
// TxIdsField returns a list of loggable fields for a given list of IDs
func TxIdsField(ids []TransactionID) log.Field {
strs := []string{}
for _, a := range ids {
strs = append(strs, a.ShortString())
}
return log.String("tx_ids", strings.Join(strs, ", "))
}
// EmptyTransactionID is a canonical empty TransactionID.
var EmptyTransactionID = TransactionID{}
// Transaction contains all transaction fields, including the signature and cached origin address and transaction ID.
type Transaction struct {
InnerTransaction
Signature [64]byte
origin *Address
id *TransactionID
}
// Origin returns the transaction's origin address: the public key extracted from the transaction signature.
func (t *Transaction) Origin() Address {
if t.origin == nil {
panic("origin not set")
}
return *t.origin
}
// SetOrigin sets the cache of the transaction's origin address.
func (t *Transaction) SetOrigin(origin Address) {
t.origin = &origin
}
// CalcAndSetOrigin extracts the public key from the transaction's signature and caches it as the transaction's origin
// address.
func (t *Transaction) CalcAndSetOrigin() error {
txBytes, err := InterfaceToBytes(&t.InnerTransaction)
if err != nil {
return fmt.Errorf("failed to marshal transaction: %v", err)
}
pubKey, err := ed25519.ExtractPublicKey(txBytes, t.Signature[:])
if err != nil {
return fmt.Errorf("failed to extract transaction pubkey: %v", err)
}
t.origin = &Address{}
t.origin.SetBytes(pubKey)
return nil
}
// ID returns the transaction's ID. If it's not cached, it's calculated, cached and returned.
func (t *Transaction) ID() TransactionID {
if t.id != nil {
return *t.id
}
txBytes, err := InterfaceToBytes(t)
if err != nil {
panic("failed to marshal transaction: " + err.Error())
}
id := TransactionID(CalcHash32(txBytes))
t.id = &id
return id
}
// Hash32 returns the TransactionID as a Hash32.
func (t *Transaction) Hash32() Hash32 {
return t.ID().Hash32()
}
// ShortString returns a the first 5 characters of the ID, for logging purposes.
func (t *Transaction) ShortString() string {
return t.ID().ShortString()
}
// String returns a string representation of the Transaction, for logging purposes.
// It implements the fmt.Stringer interface.
func (t *Transaction) String() string {
return fmt.Sprintf("<id: %s, origin: %s, recipient: %s, amount: %v, nonce: %v, gas_limit: %v, fee: %v>",
t.ID().ShortString(), t.Origin().Short(), t.Recipient.Short(), t.Amount, t.AccountNonce, t.GasLimit, t.Fee)
}
// MeshTransaction is stored in the mesh and included in the block.
type MeshTransaction struct {
Transaction
LayerID LayerID
BlockID BlockID
}
// InnerTransaction includes all of a transaction's fields, except the signature (origin and id aren't stored).
type InnerTransaction struct {
AccountNonce uint64
Recipient Address
GasLimit uint64
Fee uint64
Amount uint64
}
// Reward is a virtual reward transaction, which the node keeps track of for the gRPC api.
type Reward struct {
Layer LayerID
TotalReward uint64
LayerRewardEstimate uint64
SmesherID NodeID
Coinbase Address
}
// NewSignedTx is used in TESTS ONLY to generate signed txs
func NewSignedTx(nonce uint64, rec Address, amount, gas, fee uint64, signer *signing.EdSigner) (*Transaction, error) {
inner := InnerTransaction{
AccountNonce: nonce,
Recipient: rec,
Amount: amount,
GasLimit: gas,
Fee: fee,
}
buf, err := InterfaceToBytes(&inner)
if err != nil {
return nil, err
}
sst := &Transaction{
InnerTransaction: inner,
Signature: [64]byte{},
}
copy(sst.Signature[:], signer.Sign(buf))
addr := Address{}
addr.SetBytes(signer.PublicKey().Bytes())
sst.SetOrigin(addr)
return sst, nil
}