path: root/core/types/block.go

// 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"
	"sync"
	"sync/atomic"
	"time"

	"github.com/ethereum/go-ethereum/common"
	"github.com/ethereum/go-ethereum/common/hexutil"
	"github.com/ethereum/go-ethereum/crypto"
	"github.com/ethereum/go-ethereum/rlp"
	"golang.org/x/crypto/sha3"
)

var (
	EmptyRootHash  = common.HexToHash("56e81f171bcc55a6ff8345e692c0f86e5b48e01b996cadc001622fb5e363b421")
	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"`