Finalized size calculation methodology (#215)

- Simplified Transactioner interface
-  Added size calculation test
- Added utility methods in the address pkg: FromUint160, Uint160Decode

pkg/chain/chaindb.go

@@ -98,7 +98,7 @@ func (c *Chaindb) saveTx(tx transaction.Transactioner, txIndex uint32, blockHash
 	if err != nil {
 		return err
 	}
-	err = txTable.Put(txHash.Bytes(), tx.Bytes())
+	err = txTable.Put(txHash.Bytes(), tx.BaseTx().Bytes())
 	if err != nil {
 		return err
 	}
@@ -118,7 +118,7 @@ func (c *Chaindb) saveTx(tx transaction.Transactioner, txIndex uint32, blockHash
 	// Save all of the utxos in a transaction
 	// We do this additional save so that we can form a utxo database
 	// and know when a transaction is a double spend.
-	utxos := tx.UTXOs()
+	utxos := tx.BaseTx().Outputs
 	for utxoIndex, utxo := range utxos {
 		err := c.saveUTXO(utxo, uint16(utxoIndex), txHash.Bytes(), blockHash)
 		if err != nil {
@@ -135,7 +135,7 @@ func (c *Chaindb) saveTx(tx transaction.Transactioner, txIndex uint32, blockHash
 	// We do this so that once an output has been spent
 	// It will be removed from the utxo database and cannot be spent again
 	// If the output was never in the utxo database, this function will return an error
-	txos := tx.TXOs()
+	txos := tx.BaseTx().Inputs
 	for _, txo := range txos {
 		err := c.removeUTXO(txo)
 		if err != nil {

pkg/wire/payload/transaction/base.go

@@ -18,11 +18,8 @@ type decodeExclusiveFields func(br *util.BinReader)
 type Transactioner interface {
 	Encode(w io.Writer) error
 	Decode(r io.Reader) error
+	BaseTx() *Base
 	ID() (util.Uint256, error)
-	Bytes() []byte
-	UTXOs() []*Output
-	TXOs() []*Input
-	Witness() []*Witness
 }
 
 // Base transaction is the template for all other transactions
@@ -199,17 +196,7 @@ func (b *Base) Bytes() []byte {
 	return buf.Bytes()
 }
 
-// UTXOs returns the outputs in the tx
-func (b *Base) UTXOs() []*Output {
-	return b.Outputs
-}
-
-// TXOs returns the inputs in the tx
-func (b *Base) TXOs() []*Input {
-	return b.Inputs
-}
-
-// Witness returns the witnesses in the tx
-func (b *Base) Witness() []*Witness {
-	return b.Witnesses
+// BaseTx returns the Base object in a transaction
+func (b *Base) BaseTx() *Base {
+	return b
 }

pkg/wire/util/address/address.go

@@ -4,6 +4,7 @@ import (
 	"encoding/hex"
 
 	"github.com/CityOfZion/neo-go/pkg/crypto/base58"
+	"github.com/CityOfZion/neo-go/pkg/wire/util"
 )
 
 // ToScriptHash converts an address to a script hash
@@ -17,3 +18,21 @@ func ToScriptHash(address string) string {
 	scriptHash := (decodedAddressAsHex[2:42])
 	return scriptHash
 }
+
+// FromUint160 returns the "NEO address" from the given
+// Uint160.
+func FromUint160(u util.Uint160) (string, error) {
+	// Dont forget to prepend the Address version 0x17 (23) A
+	b := append([]byte{0x17}, u.Bytes()...)
+	return base58.CheckEncode(b)
+}
+
+// Uint160Decode attempts to decode the given NEO address string
+// into an Uint160.
+func Uint160Decode(s string) (u util.Uint160, err error) {
+	b, err := base58.CheckDecode(s)
+	if err != nil {
+		return u, err
+	}
+	return util.Uint160DecodeBytes(b[1:21])
+}