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TokenTx.go
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TokenTx.go
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package api
import (
"bytes"
"encoding/binary"
"encoding/json"
"fmt"
"github.com/AccumulateNetwork/accumulated/smt/common"
"github.com/AccumulateNetwork/accumulated/types"
)
const MaxTokenTxOutputs = 100
type TokenTx struct {
Hash types.Bytes32 `json:"hash,omitempty" form:"hash" query:"hash" validate:"required"`
From types.UrlChain `json:"from" form:"from" query:"from" validate:"required"`
To []*TokenTxOutput `json:"to" form:"to" query:"to" validate:"required"`
Meta json.RawMessage `json:"meta,omitempty" form:"meta" query:"meta" validate:"required"`
}
type TokenTxRequest struct {
Hash types.Bytes32 `json:"hash" form:"hash" query:"hash" validate:"required"`
}
//TokenTxOutput is the structure for the output. Only handles 64 bit amounts at this time.
type TokenTxOutput struct {
URL types.UrlChain `json:"url" form:"url" query:"url" validate:"required"`
Amount uint64 `json:"amount" form:"amount" query:"amount" validate:"gt=0"`
}
func NewTokenTx(from types.String, to ...*TokenTxOutput) *TokenTx {
tx := &TokenTx{}
tx.From = types.UrlChain{from}
tx.To = to
return tx
}
func NewTokenTxOutput(url types.String, amount uint64) *TokenTxOutput {
txo := new(TokenTxOutput)
txo.URL = types.UrlChain{url}
txo.Amount = amount
return txo
}
func (t *TokenTx) AddToAccount(toUrl types.String, amt uint64) {
txOut := TokenTxOutput{types.UrlChain{String: toUrl}, amt}
t.To = append(t.To, &txOut)
}
func (t *TokenTx) SetMetadata(md *json.RawMessage) error {
if md == nil {
return fmt.Errorf("invalid metadata")
}
copy(t.Meta[:], (*md)[:])
return nil
}
// Equal
// returns true if t == t2, otherwise return false. Comparing t with t2, if
// any runtime error occurs we return false
func (t *TokenTx) Equal(t2 *TokenTx) (ret bool) {
defer func() { // ret will default to false, so if any error occurs
}() // we will return false as long as we catch any errors
if t.From != t2.From { // Make sure accountURLs are the same
return false
}
tLen := len(t.To) // Get our len
if tLen != len(t2.To) || tLen < 1 || tLen > MaxTokenTxOutputs { // Make sure len is in range and same as t2
return false // If anything is different, function is false.
}
for i := range t.To {
if !t.To[i].Equal(t2.To[i]) {
return false
}
}
return true // Only at the very end after all is done we return true
}
// MarshalBinary serialize the token transaction
func (t *TokenTx) MarshalBinary() ([]byte, error) {
var buffer bytes.Buffer
buffer.Write(common.Uint64Bytes(types.TxTypeTokenTx.AsUint64()))
data, err := t.From.MarshalBinary()
if err != nil {
return nil, fmt.Errorf("error marshaling From %s,%v", t.From, err)
}
buffer.Write(data)
numOutputs := uint64(len(t.To))
if numOutputs > MaxTokenTxOutputs {
return nil, fmt.Errorf("too many outputs for token transaction, please specify between 1 and %d outputs", MaxTokenTxOutputs)
}
if numOutputs < 1 {
return nil, fmt.Errorf("insufficient token transaction outputs, please specify between 1 and %d outputs", MaxTokenTxOutputs)
}
buffer.Write(common.Uint64Bytes(numOutputs))
for i, v := range t.To {
data, err = v.MarshalBinary()
if err != nil {
return nil, fmt.Errorf("error marshaling To[%d] %s,%v", i, v.URL, err)
}
buffer.Write(data)
}
a := types.Bytes(t.Meta)
if a != nil {
data, err = a.MarshalBinary()
if err != nil {
return nil, fmt.Errorf("error marshalling meta data, %v", err)
}
buffer.Write(data)
}
return buffer.Bytes(), nil
}
// UnmarshalBinary deserialize the token transaction
func (t *TokenTx) UnmarshalBinary(data []byte) (err error) {
defer func() {
if r := recover(); r != nil {
err = fmt.Errorf("error marshaling TokenTx State %v", r)
}
}()
txType, data := common.BytesUint64(data) // get the type
if txType != types.TxTypeTokenTx.AsUint64() {
return fmt.Errorf("invalid transaction type, expecting TokenTx")
}
err = t.From.UnmarshalBinary(data)
if err != nil {
return fmt.Errorf("unable to unmarshal FromUrl in transaction, %v", err)
}
//get the length of the outputs
toLen, data := common.BytesUint64(data[t.From.Size(nil):])
if toLen > MaxTokenTxOutputs || toLen < 1 {
return fmt.Errorf("invalid number of outputs for transaction")
}
t.To = make([]*TokenTxOutput, toLen)
i := 0
for j := uint64(0); j < toLen; j++ {
txOut := &TokenTxOutput{}
err := txOut.UnmarshalBinary(data[i:])
if err != nil {
return fmt.Errorf("unable to unmarshal token tx output for index %d", j)
}
i += txOut.Size()
t.To[j] = txOut
}
if len(data) > i {
//we have metadata
b := types.Bytes{}
err := b.UnmarshalBinary(data[i:])
if err != nil {
return fmt.Errorf("unable to unmarshal binary for meta data of transaction token tx")
}
t.Meta = b.Bytes()
}
return nil
}
// Size return the size of the Token Tx output
func (t *TokenTxOutput) Size() int {
var buf [16]byte
count := binary.PutUvarint(buf[:], t.Amount)
return t.URL.Size(nil) + count
}
// Equal returns true if t = t2
func (t *TokenTxOutput) Equal(t2 *TokenTxOutput) bool {
defer func() { // ret will default to false, so if any error occurs
}() // we will return false as long as we catch any errors
if t.Amount != t2.Amount {
return false
}
if t.URL != t2.URL {
return false
}
return true
}
// MarshalBinary serialize the token tx output
func (t *TokenTxOutput) MarshalBinary() ([]byte, error) {
var buffer bytes.Buffer
data, err := t.URL.MarshalBinary()
if err != nil {
return nil, err
}
buffer.Write(data)
data = common.Uint64Bytes(t.Amount)
buffer.Write(data)
return buffer.Bytes(), nil
}
// UnmarshalBinary deserialize the token tx output
func (t *TokenTxOutput) UnmarshalBinary(data []byte) (err error) {
defer func() {
if rErr := recover(); rErr != nil {
err = fmt.Errorf("error unmarshaling token tx output %v", rErr)
}
}()
err = t.URL.UnmarshalBinary(data)
if err != nil {
return err
}
l := t.URL.Size(nil)
if l > len(data) {
return fmt.Errorf("insufficient data to unmarshal amount")
}
t.Amount, _ = common.BytesUint64(data[l:])
return nil
}