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mixinnet_transaction.go
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/
mixinnet_transaction.go
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package mixin
import (
"bytes"
"context"
"encoding/hex"
"errors"
"fmt"
"github.com/fox-one/msgpack"
"github.com/shopspring/decimal"
)
const (
TxVersion = 0x01
)
type (
MintData struct {
Group string `json:"group"`
Batch uint64 `json:"batch"`
Amount Integer `json:"amount"`
}
DepositData struct {
Chain Hash `json:"chain"`
AssetKey string `json:"asset"`
TransactionHash string `json:"transaction"`
OutputIndex uint64 `json:"index"`
Amount Integer `json:"amount"`
}
Input struct {
Hash *Hash `json:"hash,omitempty"`
Index int `json:"index,omitempty"`
Genesis []byte `json:"genesis,omitempty"`
Deposit *DepositData `json:"deposit,omitempty"`
Mint *MintData `json:"mint,omitempty"`
}
Output struct {
Type uint8 `json:"type"`
Amount Integer `json:"amount"`
Keys []Key `json:"keys,omitempty"`
Script Script `json:"script"`
Mask Key `json:"mask,omitempty"`
}
Transaction struct {
Hash *Hash `json:"hash,omitempty" msgpack:"-"`
Version uint8 `json:"version"`
Asset Hash `json:"asset"`
Inputs []*Input `json:"inputs"`
Outputs []*Output `json:"outputs"`
Extra TransactionExtra `json:"extra,omitempty"`
Signatures [][]Signature `json:"signatures,omitempty" msgpack:",omitempty"`
Snapshot *Hash `json:"snapshot,omitempty" msgpack:"-"`
}
TransactionOutput struct {
Receivers []string
Threshold uint8
Amount decimal.Decimal
}
TransactionInput struct {
Memo string
Inputs []*MultisigUTXO
Outputs []TransactionOutput
Hint string
}
)
func (t *Transaction) DumpTransaction() (string, error) {
var buf bytes.Buffer
enc := msgpack.NewEncoder(&buf).UseCompactEncoding(true)
err := enc.Encode(t)
if err != nil {
return "", err
}
return hex.EncodeToString(buf.Bytes()), nil
}
func (t *Transaction) DumpTransactionPayload() (string, error) {
sigs := t.Signatures
t.Signatures = nil
raw, err := t.DumpTransaction()
t.Signatures = sigs
return raw, err
}
func (t *Transaction) TransactionHash() (Hash, error) {
if t.Hash == nil {
raw, err := t.DumpTransactionPayload()
if err != nil {
return Hash{}, err
}
bts, _ := hex.DecodeString(raw)
h := NewHash(bts)
t.Hash = &h
}
return *t.Hash, nil
}
func (i *TransactionInput) AppendUTXO(utxo *MultisigUTXO) {
i.Inputs = append(i.Inputs, utxo)
}
func (i *TransactionInput) AppendOutput(receivers []string, threshold uint8, amount decimal.Decimal) {
i.Outputs = append(i.Outputs, TransactionOutput{
Receivers: receivers,
Threshold: threshold,
Amount: amount,
})
}
func (i *TransactionInput) Asset() Hash {
if len(i.Inputs) == 0 {
return Hash{}
}
return i.Inputs[0].Asset()
}
func (i *TransactionInput) TotalInputAmount() decimal.Decimal {
var total decimal.Decimal
for _, input := range i.Inputs {
total = total.Add(input.Amount)
}
return total
}
func (i *TransactionInput) Validate() error {
if len(i.Inputs) == 0 {
return errors.New("no input utxo")
}
var (
members = map[string]bool{}
total = i.TotalInputAmount()
asset = i.Asset()
)
for _, input := range i.Inputs {
if asset != input.Asset() {
return errors.New("invalid input utxo, asset not matched")
}
if len(members) == 0 {
for _, u := range input.Members {
members[u] = true
}
continue
}
if len(members) != len(input.Members) {
return errors.New("invalid input utxo, member not matched")
}
for _, m := range input.Members {
if _, f := members[m]; !f {
return errors.New("invalid input utxo, member not matched")
}
}
}
for _, output := range i.Outputs {
if output.Threshold == 0 || int(output.Threshold) > len(output.Receivers) {
return fmt.Errorf("invalid output threshold: %d", output.Threshold)
}
if !output.Amount.IsPositive() {
return fmt.Errorf("invalid output amount: %v", output.Amount)
}
if total = total.Sub(output.Amount); total.IsNegative() {
return errors.New("invalid output: amount exceed")
}
}
return nil
}
func (c *Client) MakeMultisigTransaction(ctx context.Context, input *TransactionInput) (*Transaction, error) {
if err := input.Validate(); err != nil {
return nil, err
}
var tx = Transaction{
Version: TxVersion,
Asset: input.Asset(),
Extra: []byte(input.Memo),
}
// add inputs
for _, input := range input.Inputs {
tx.Inputs = append(tx.Inputs, &Input{
Hash: &input.TransactionHash,
Index: input.OutputIndex,
})
}
outputs := input.Outputs
// refund the change
{
change := input.TotalInputAmount()
for _, output := range input.Outputs {
change = change.Sub(output.Amount)
}
if change.IsPositive() {
outputs = append(outputs, TransactionOutput{
Receivers: input.Inputs[0].Members,
Threshold: input.Inputs[0].Threshold,
Amount: change,
})
}
}
ghostInputs := make([]*GhostInput, 0, len(outputs))
for idx, output := range outputs {
ghostInputs = append(ghostInputs, &GhostInput{
Receivers: output.Receivers,
Index: idx,
Hint: input.Hint,
})
}
ghosts, err := c.BatchReadGhostKeys(ctx, ghostInputs)
if err != nil {
return nil, err
}
for idx, output := range outputs {
ghost := ghosts[idx]
tx.Outputs = append(tx.Outputs, ghost.DumpOutput(output.Threshold, output.Amount))
}
return &tx, nil
}
func TransactionFromRaw(raw string) (*Transaction, error) {
bts, err := hex.DecodeString(raw)
if err != nil {
return nil, err
}
var tx Transaction
if err := msgpack.Unmarshal(bts, &tx); err != nil {
return nil, err
}
return &tx, nil
}