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// Copyright 2014 The go-ethereum Authors
// This file is part of the go-ethereum library.
//
// The go-ethereum library is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// The go-ethereum library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
package types
import (
"fmt"
"io"
"math/big"
"github.com/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/common/hexutil"
"github.com/ethereum/go-ethereum/rlp"
)
//go:generate gencodec -type Receipt -field-override receiptMarshaling -out gen_receipt_json.go
const (
receiptStatusSuccessful = byte(0x01)
receiptStatusFailed = byte(0x00)
)
// Receipt represents the results of a transaction.
type Receipt struct {
// Consensus fields
PostState []byte `json:"root"`
Failed bool `json:"failed"`
CumulativeGasUsed *big.Int `json:"cumulativeGasUsed" gencodec:"required"`
Bloom Bloom `json:"logsBloom" gencodec:"required"`
Logs []*Log `json:"logs" gencodec:"required"`
// Implementation fields (don't reorder!)
TxHash common.Hash `json:"transactionHash" gencodec:"required"`
ContractAddress common.Address `json:"contractAddress"`
GasUsed *big.Int `json:"gasUsed" gencodec:"required"`
}
type receiptMarshaling struct {
PostState hexutil.Bytes
CumulativeGasUsed *hexutil.Big
GasUsed *hexutil.Big
}
// homesteadReceiptRLP contains the receipt's Homestead consensus fields, used
// during RLP serialization.
type homesteadReceiptRLP struct {
PostState []byte
CumulativeGasUsed *big.Int
Bloom Bloom
Logs []*Log
}
// metropolisReceiptRLP contains the receipt's Metropolis consensus fields, used
// during RLP serialization.
type metropolisReceiptRLP struct {
Status byte
CumulativeGasUsed *big.Int
Bloom Bloom
Logs []*Log
}
// NewReceipt creates a barebone transaction receipt, copying the init fields.
func NewReceipt(root []byte, failed bool, cumulativeGasUsed *big.Int) *Receipt {
return &Receipt{PostState: common.CopyBytes(root), Failed: failed, CumulativeGasUsed: new(big.Int).Set(cumulativeGasUsed)}
}
// EncodeRLP implements rlp.Encoder, and flattens the consensus fields of a receipt
// into an RLP stream. If no post state is present, metropolis fork is assumed.
func (r *Receipt) EncodeRLP(w io.Writer) error {
if r.PostState == nil {
status := receiptStatusSuccessful
if r.Failed {
status = receiptStatusFailed
}
return rlp.Encode(w, &metropolisReceiptRLP{status, r.CumulativeGasUsed, r.Bloom, r.Logs})
}
return rlp.Encode(w, &homesteadReceiptRLP{r.PostState, r.CumulativeGasUsed, r.Bloom, r.Logs})
}
// DecodeRLP implements rlp.Decoder, and loads the consensus fields of a receipt
// from an RLP stream.
func (r *Receipt) DecodeRLP(s *rlp.Stream) error {
// Load the raw bytes since we have multiple possible formats
raw, err := s.Raw()
if err != nil {
return err
}
content, _, err := rlp.SplitList(raw)
if err != nil {
return err
}
kind, cnt, _, err := rlp.Split(content)
if err != nil {
return err
}
// Deserialize based on the first component type.
switch {
case kind == rlp.Byte || kind == rlp.String && len(cnt) == 0:
// The first component of metropolis receipts is Byte
// or empty String(byte with 0x00 value).
var metro metropolisReceiptRLP
if err := rlp.DecodeBytes(raw, &metro); err != nil {
return err
}
r.Failed = metro.Status == receiptStatusFailed
r.CumulativeGasUsed = metro.CumulativeGasUsed
r.Bloom = metro.Bloom
r.Logs = metro.Logs
return nil
case kind == rlp.String:
// The first component of homestead receipts is non-empty String.
var home homesteadReceiptRLP
if err := rlp.DecodeBytes(raw, &home); err != nil {
return err
}
r.PostState = home.PostState[:]
r.CumulativeGasUsed = home.CumulativeGasUsed
r.Bloom = home.Bloom
r.Logs = home.Logs
return nil
default:
return fmt.Errorf("invalid first receipt component: %v", kind)
}
}
// String implements the Stringer interface.
func (r *Receipt) String() string {
if r.PostState == nil {
return fmt.Sprintf("receipt{failed=%t cgas=%v bloom=%x logs=%v}", r.Failed, r.CumulativeGasUsed, r.Bloom, r.Logs)
}
return fmt.Sprintf("receipt{med=%x cgas=%v bloom=%x logs=%v}", r.PostState, r.CumulativeGasUsed, r.Bloom, r.Logs)
}
// ReceiptForStorage is a wrapper around a Receipt that flattens and parses the
// entire content of a receipt, as opposed to only the consensus fields originally.
type ReceiptForStorage Receipt
// EncodeRLP implements rlp.Encoder, and flattens all content fields of a receipt
// into an RLP stream.
func (r *ReceiptForStorage) EncodeRLP(w io.Writer) error {
logs := make([]*LogForStorage, len(r.Logs))
for i, log := range r.Logs {
logs[i] = (*LogForStorage)(log)
}
return rlp.Encode(w, []interface{}{r.PostState, r.Failed, r.CumulativeGasUsed, r.Bloom, r.TxHash, r.ContractAddress, logs, r.GasUsed})
}
// DecodeRLP implements rlp.Decoder, and loads both consensus and implementation
// fields of a receipt from an RLP stream.
func (r *ReceiptForStorage) DecodeRLP(s *rlp.Stream) error {
var receipt struct {
PostState []byte
Failed bool
CumulativeGasUsed *big.Int
Bloom Bloom
TxHash common.Hash
ContractAddress common.Address
Logs []*LogForStorage
GasUsed *big.Int
}
if err := s.Decode(&receipt); err != nil {
return err
}
// Assign the consensus fields
r.PostState, r.Failed, r.CumulativeGasUsed, r.Bloom = receipt.PostState, receipt.Failed, receipt.CumulativeGasUsed, receipt.Bloom
r.Logs = make([]*Log, len(receipt.Logs))
for i, log := range receipt.Logs {
r.Logs[i] = (*Log)(log)
}
// Assign the implementation fields
r.TxHash, r.ContractAddress, r.GasUsed = receipt.TxHash, receipt.ContractAddress, receipt.GasUsed
return nil
}
// Receipts is a wrapper around a Receipt array to implement DerivableList.
type Receipts []*Receipt
// Len returns the number of receipts in this list.
func (r Receipts) Len() int { return len(r) }
// GetRlp returns the RLP encoding of one receipt from the list.
func (r Receipts) GetRlp(i int) []byte {
bytes, err := rlp.EncodeToBytes(r[i])
if err != nil {
panic(err)
}
return bytes
}
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