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90 lines
2.1 KiB
90 lines
2.1 KiB
package blockchain
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import (
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"bytes"
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"crypto/sha256"
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"encoding/gob"
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"encoding/hex"
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"fmt"
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"log"
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)
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// Transaction represents a Bitcoin transaction
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type Transaction struct {
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ID []byte // 32 byte hash
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TxInput []TXInput
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TxOutput []TXOutput
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}
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// TXOutput is the struct of transaction output in a transaction.
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type TXOutput struct {
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Value int
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Address string
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}
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// TXInput is the struct of transaction input in a transaction.
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type TXInput struct {
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TxID []byte
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TxOutputIndex int
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Address string
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}
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// DefaultCoinbaseValue is the default value of coinbase transaction.
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const DefaultCoinbaseValue = 1000
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// SetID sets ID of a transaction (32 byte hash of the whole transaction)
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func (tx *Transaction) SetID() {
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var encoded bytes.Buffer
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var hash [32]byte
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enc := gob.NewEncoder(&encoded)
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err := enc.Encode(tx)
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if err != nil {
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log.Panic(err)
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}
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hash = sha256.Sum256(encoded.Bytes())
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tx.ID = hash[:]
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}
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// NewCoinbaseTX creates a new coinbase transaction
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func NewCoinbaseTX(to, data string) *Transaction {
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if data == "" {
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data = fmt.Sprintf("Reward to '%s'", to)
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}
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txin := TXInput{[]byte{}, -1, data}
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txout := TXOutput{DefaultCoinbaseValue, to}
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tx := Transaction{nil, []TXInput{txin}, []TXOutput{txout}}
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tx.SetID()
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return &tx
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}
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// Used for debuging.
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func (txInput *TXInput) String() string {
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res := fmt.Sprintf("TxID: %v, ", hex.EncodeToString(txInput.TxID))
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res += fmt.Sprintf("TxOutputIndex: %v, ", txInput.TxOutputIndex)
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res += fmt.Sprintf("Address: %v", txInput.Address)
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return res
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}
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// Used for debuging.
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func (txOutput *TXOutput) String() string {
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res := fmt.Sprintf("Value: %v, ", txOutput.Value)
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res += fmt.Sprintf("Address: %v", txOutput.Address)
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return res
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}
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// Used for debuging.
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func (tx *Transaction) String() string {
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res := fmt.Sprintf("ID: %v\n", hex.EncodeToString(tx.ID))
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res += fmt.Sprintf("TxInput:\n")
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for id, value := range tx.TxInput {
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res += fmt.Sprintf("%v: %v\n", id, value.String())
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}
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res += fmt.Sprintf("TxOutput:\n")
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for id, value := range tx.TxOutput {
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res += fmt.Sprintf("%v: %v\n", id, value.String())
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}
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return res
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}
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