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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 contains data types related to Ethereum consensus.
package types
import (
"bytes"
"encoding/binary"
"fmt"
"io"
"math/big"
"reflect"
"sort"
"sync/atomic"
"time"
"github.com/ava-labs/go-ethereum/common"
"github.com/ava-labs/go-ethereum/common/hexutil"
"github.com/ava-labs/go-ethereum/rlp"
"golang.org/x/crypto/sha3"
)
var (
EmptyRootHash = DeriveSha(Transactions{})
EmptyUncleHash = rlpHash([]*Header(nil))
)
// A BlockNonce is a 64-bit hash which proves (combined with the
// mix-hash) that a sufficient amount of computation has been carried
// out on a block.
type BlockNonce [8]byte
// EncodeNonce converts the given integer to a block nonce.
func EncodeNonce(i uint64) BlockNonce {
var n BlockNonce
binary.BigEndian.PutUint64(n[:], i)
return n
}
// Uint64 returns the integer value of a block nonce.
func (n BlockNonce) Uint64() uint64 {
return binary.BigEndian.Uint64(n[:])
}
// MarshalText encodes n as a hex string with 0x prefix.
func (n BlockNonce) MarshalText() ([]byte, error) {
return hexutil.Bytes(n[:]).MarshalText()
}
// UnmarshalText implements encoding.TextUnmarshaler.
func (n *BlockNonce) UnmarshalText(input []byte) error {
return hexutil.UnmarshalFixedText("BlockNonce", input, n[:])
}
//go:generate gencodec -type Header -field-override headerMarshaling -out gen_header_json.go
// Header represents a block header in the Ethereum blockchain.
type Header struct {
ParentHash common.Hash `json:"parentHash" gencodec:"required"`
UncleHash common.Hash `json:"sha3Uncles" gencodec:"required"`
Coinbase common.Address `json:"miner" gencodec:"required"`
Root common.Hash `json:"stateRoot" gencodec:"required"`
TxHash common.Hash `json:"transactionsRoot" gencodec:"required"`
ReceiptHash common.Hash `json:"receiptsRoot" gencodec:"required"`
Bloom Bloom `json:"logsBloom" gencodec:"required"`
Difficulty *big.Int `json:"difficulty" gencodec:"required"`
Number *big.Int `json:"number" gencodec:"required"`
GasLimit uint64 `json:"gasLimit" gencodec:"required"`
GasUsed uint64 `json:"gasUsed" gencodec:"required"`
Time uint64 `json:"timestamp" gencodec:"required"`
Extra []byte `json:"extraData" gencodec:"required"`
MixDigest common.Hash `json:"mixHash"`
Nonce BlockNonce `json:"nonce"`
ExtDataHash common.Hash `json:"extDataHash" gencodec:"required"`
}
// field type overrides for gencodec
type headerMarshaling struct {
Difficulty *hexutil.Big
Number *hexutil.Big
GasLimit hexutil.Uint64
GasUsed hexutil.Uint64
Time hexutil.Uint64
Extra hexutil.Bytes
Hash common.Hash `json:"hash"` // adds call to Hash() in MarshalJSON
}
// Hash returns the block hash of the header, which is simply the keccak256 hash of its
// RLP encoding.
func (h *Header) Hash() common.Hash {
return rlpHash(h)
}
var headerSize = common.StorageSize(reflect.TypeOf(Header{}).Size())
// Size returns the approximate memory used by all internal contents. It is used
// to approximate and limit the memory consumption of various caches.
func (h *Header) Size() common.StorageSize {
return headerSize + common.StorageSize(len(h.Extra)+(h.Difficulty.BitLen()+h.Number.BitLen())/8)
}
// SanityCheck checks a few basic things -- these checks are way beyond what
// any 'sane' production values should hold, and can mainly be used to prevent
// that the unbounded fields are stuffed with junk data to add processing
// overhead
func (h *Header) SanityCheck() error {
if h.Number != nil && !h.Number.IsUint64() {
return fmt.Errorf("too large block number: bitlen %d", h.Number.BitLen())
}
if h.Difficulty != nil {
if diffLen := h.Difficulty.BitLen(); diffLen > 80 {
return fmt.Errorf("too large block difficulty: bitlen %d", diffLen)
}
}
if eLen := len(h.
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