Updated transaction model

Changed the behaviour of decoding rlp data. Something is considered to
be creating a contract if the 4th item is a list.

Changed constructors.

ethchain/transaction.go

@@ -2,6 +2,7 @@ package ethchain
 
 import (
 	"bytes"
+	"fmt"
 	"github.com/ethereum/eth-go/ethutil"
 	"github.com/obscuren/secp256k1-go"
 	"math/big"
@@ -23,33 +24,14 @@ type Transaction struct {
 	contractCreation bool
 }
 
-/*
-func NewTransaction(to []byte, value *big.Int, data []string) *Transaction {
-	tx := Transaction{Recipient: to, Value: value, Nonce: 0, Data: data}
-
-	return &tx
-}
-*/
-
 func NewContractCreationTx(value, gasprice *big.Int, data []string) *Transaction {
 	return &Transaction{Value: value, Gasprice: gasprice, Data: data, contractCreation: true}
 }
 
-func NewContractMessageTx(to []byte, value, gasprice, gas *big.Int, data []string) *Transaction {
+func NewTransactionMessage(to []byte, value, gasprice, gas *big.Int, data []string) *Transaction {
 	return &Transaction{Recipient: to, Value: value, Gasprice: gasprice, Gas: gas, Data: data}
 }
 
-func NewTx(to []byte, value *big.Int, data []string) *Transaction {
-	return &Transaction{Recipient: to, Value: value, Gasprice: big.NewInt(0), Gas: big.NewInt(0), Nonce: 0, Data: data}
-}
-
-/*
-// XXX Deprecated
-func NewTransactionFromData(data []byte) *Transaction {
-	return NewTransactionFromBytes(data)
-}
-*/
-
 func NewTransactionFromBytes(data []byte) *Transaction {
 	tx := &Transaction{}
 	tx.RlpDecode(data)
@@ -131,16 +113,13 @@ func (tx *Transaction) Sign(privk []byte) error {
 }
 
 func (tx *Transaction) RlpData() interface{} {
-	// Prepare the transaction for serialization
-	return []interface{}{
-		tx.Nonce,
-		tx.Recipient,
-		tx.Value,
-		ethutil.NewSliceValue(tx.Data).Slice(),
-		tx.v,
-		tx.r,
-		tx.s,
+	data := []interface{}{tx.Nonce, tx.Value, tx.Gasprice}
+
+	if !tx.contractCreation {
+		data = append(data, tx.Recipient, tx.Gas)
 	}
+
+	return append(data, ethutil.NewSliceValue(tx.Data).Slice(), tx.v, tx.r, tx.s)
 }
 
 func (tx *Transaction) RlpValue() *ethutil.Value {
@@ -156,14 +135,16 @@ func (tx *Transaction) RlpDecode(data []byte) {
 }
 
 //   [ NONCE, VALUE, GASPRICE, TO, GAS, DATA, V, R, S ]
+//["" "\x03\xe8" "" "\xaa" "\x03\xe8" [] '\x1c' "\x10C\x15\xfc\xe5\xd0\t\xe4\r\xe7\xefa\xf5aE\xd6\x14\xaed\xb5.\xf5\x18\xa1S_j\xe0A\xdc5U" "dQ\nqy\xf8\x17+\xbf\xd7Jx\xda-\xcb\xd7\xcfQ\x1bI\xb8_9\b\x80\xea듎i|\x1f"]
 func (tx *Transaction) RlpValueDecode(decoder *ethutil.Value) {
+	fmt.Println(decoder)
 	tx.Nonce = decoder.Get(0).Uint()
 	tx.Value = decoder.Get(1).BigInt()
 	tx.Gasprice = decoder.Get(2).BigInt()
 
 	// If the 4th item is a list(slice) this tx
 	// is a contract creation tx
-	if decoder.Get(3).IsSlice() {
+	if decoder.Get(3).IsList() {
 		d := decoder.Get(3)
 		tx.Data = make([]string, d.Len())
 		for i := 0; i < d.Len(); i++ {
@@ -173,6 +154,7 @@ func (tx *Transaction) RlpValueDecode(decoder *ethutil.Value) {
 		tx.v = byte(decoder.Get(4).Uint())
 		tx.r = decoder.Get(5).Bytes()
 		tx.s = decoder.Get(6).Bytes()
+
 		tx.contractCreation = true
 	} else {
 		tx.Recipient = decoder.Get(3).Bytes()