modify transaction structure and method for cross shard tx

core/types/gen_tx_json.go

@@ -17,9 +17,10 @@ var _ = (*txdataMarshaling)(nil)
 func (t txdata) MarshalJSON() ([]byte, error) {
 	type txdata struct {
 		AccountNonce hexutil.Uint64  `json:"nonce"      gencodec:"required"`
-		ShardID      uint32          `json:"shardID"  gencodec:"required"`
 		Price        *hexutil.Big    `json:"gasPrice"   gencodec:"required"`
 		GasLimit     hexutil.Uint64  `json:"gas"        gencodec:"required"`
+		ShardID      uint32          `json:"shardID"    gencodec:"required"`
+		ToShardID    uint32          `json:"toShardID"`
 		Recipient    *common.Address `json:"to"         rlp:"nil"`
 		Amount       *hexutil.Big    `json:"value"      gencodec:"required"`
 		Payload      hexutil.Bytes   `json:"input"      gencodec:"required"`
@@ -30,9 +31,10 @@ func (t txdata) MarshalJSON() ([]byte, error) {
 	}
 	var enc txdata
 	enc.AccountNonce = hexutil.Uint64(t.AccountNonce)
-	enc.ShardID = t.ShardID
 	enc.Price = (*hexutil.Big)(t.Price)
 	enc.GasLimit = hexutil.Uint64(t.GasLimit)
+	enc.ShardID = t.ShardID
+	enc.ToShardID = t.ToShardID
 	enc.Recipient = t.Recipient
 	enc.Amount = (*hexutil.Big)(t.Amount)
 	enc.Payload = t.Payload
@@ -47,9 +49,10 @@ func (t txdata) MarshalJSON() ([]byte, error) {
 func (t *txdata) UnmarshalJSON(input []byte) error {
 	type txdata struct {
 		AccountNonce *hexutil.Uint64 `json:"nonce"      gencodec:"required"`
-		ShardID      *uint32         `json:"shardID"  gencodec:"required"`
 		Price        *hexutil.Big    `json:"gasPrice"   gencodec:"required"`
 		GasLimit     *hexutil.Uint64 `json:"gas"        gencodec:"required"`
+		ShardID      *uint32         `json:"shardID"    gencodec:"required"`
+		ToShardID    *uint32         `json:"toShardID"`
 		Recipient    *common.Address `json:"to"         rlp:"nil"`
 		Amount       *hexutil.Big    `json:"value"      gencodec:"required"`
 		Payload      *hexutil.Bytes  `json:"input"      gencodec:"required"`
@@ -66,10 +69,6 @@ func (t *txdata) UnmarshalJSON(input []byte) error {
 		return errors.New("missing required field 'nonce' for txdata")
 	}
 	t.AccountNonce = uint64(*dec.AccountNonce)
-	if dec.ShardID == nil {
-		return errors.New("missing required field 'shardID' for txdata")
-	}
-	t.ShardID = *dec.ShardID
 	if dec.Price == nil {
 		return errors.New("missing required field 'gasPrice' for txdata")
 	}
@@ -78,6 +77,13 @@ func (t *txdata) UnmarshalJSON(input []byte) error {
 		return errors.New("missing required field 'gas' for txdata")
 	}
 	t.GasLimit = uint64(*dec.GasLimit)
+	if dec.ShardID == nil {
+		return errors.New("missing required field 'shardID' for txdata")
+	}
+	t.ShardID = *dec.ShardID
+	if dec.ToShardID != nil {
+		t.ToShardID = *dec.ToShardID
+	}
 	if dec.Recipient != nil {
 		t.Recipient = dec.Recipient
 	}

core/types/transaction.go

@@ -50,7 +50,7 @@ type txdata struct {
 	Price        *big.Int        `json:"gasPrice"   gencodec:"required"`
 	GasLimit     uint64          `json:"gas"        gencodec:"required"`
 	ShardID      uint32          `json:"shardID"    gencodec:"required"`
-	ToShardID    uint32          `json:"toShardID"  gencodec:"required"`
+	ToShardID    uint32          `json:"toShardID"`
 	Recipient    *common.Address `json:"to"         rlp:"nil"` // nil means contract creation
 	Amount       *big.Int        `json:"value"      gencodec:"required"`
 	Payload      []byte          `json:"input"      gencodec:"required"`
@@ -111,6 +111,34 @@ func newTransaction(nonce uint64, to *common.Address, shardID uint32, amount *bi
 	return &Transaction{data: d}
 }
 
+// create new cross-shard transaction
+func newCrossShardTransaction(nonce uint64, to *common.Address, shardID uint32, toShardID uint32, amount *big.Int, gasLimit uint64, gasPrice *big.Int, data []byte) *Transaction {
+	if len(data) > 0 {
+		data = common.CopyBytes(data)
+	}
+	d := txdata{
+		AccountNonce: nonce,
+		Recipient:    to,
+		ShardID:      shardID,
+		ToShardID:    toShardID,
+		Payload:      data,
+		Amount:       new(big.Int),
+		GasLimit:     gasLimit,
+		Price:        new(big.Int),
+		V:            new(big.Int),
+		R:            new(big.Int),
+		S:            new(big.Int),
+	}
+	if amount != nil {
+		d.Amount.Set(amount)
+	}
+	if gasPrice != nil {
+		d.Price.Set(gasPrice)
+	}
+
+	return &Transaction{data: d}
+}
+
 // ChainID returns which chain id this transaction was signed for (if at all)
 func (tx *Transaction) ChainID() *big.Int {
 	return deriveChainID(tx.data.V)
@@ -121,6 +149,11 @@ func (tx *Transaction) ShardID() uint32 {
 	return tx.data.ShardID
 }
 
+// ToShardID returns the destination shard id this transaction is going to
+func (tx *Transaction) ToShardID() uint32 {
+	return tx.data.ToShardID
+}
+
 // Protected returns whether the transaction is protected from replay protection.
 func (tx *Transaction) Protected() bool {
 	return isProtectedV(tx.data.V)