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chain.go
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chain.go
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// Copyright 2020 The go-ethereum Authors
// This file is part of go-ethereum.
//
// go-ethereum is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// go-ethereum 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 General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with go-ethereum. If not, see <http://www.gnu.org/licenses/>.
package ethtest
import (
"bytes"
"compress/gzip"
"crypto/ecdsa"
"encoding/json"
"errors"
"fmt"
"io"
"math/big"
"os"
"path/filepath"
"slices"
"sort"
"strings"
"github.com/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/common/hexutil"
"github.com/ethereum/go-ethereum/core"
"github.com/ethereum/go-ethereum/core/forkid"
"github.com/ethereum/go-ethereum/core/state"
"github.com/ethereum/go-ethereum/core/types"
"github.com/ethereum/go-ethereum/crypto"
"github.com/ethereum/go-ethereum/eth/protocols/eth"
"github.com/ethereum/go-ethereum/params"
"github.com/ethereum/go-ethereum/rlp"
)
// Chain is a lightweight blockchain-like store which can read a hivechain
// created chain.
type Chain struct {
genesis core.Genesis
blocks []*types.Block
state map[common.Address]state.DumpAccount // state of head block
senders map[common.Address]*senderInfo
config *params.ChainConfig
}
// NewChain takes the given chain.rlp file, and decodes and returns
// the blocks from the file.
func NewChain(dir string) (*Chain, error) {
gen, err := loadGenesis(filepath.Join(dir, "genesis.json"))
if err != nil {
return nil, err
}
gblock := gen.ToBlock()
blocks, err := blocksFromFile(filepath.Join(dir, "chain.rlp"), gblock)
if err != nil {
return nil, err
}
state, err := readState(filepath.Join(dir, "headstate.json"))
if err != nil {
return nil, err
}
accounts, err := readAccounts(filepath.Join(dir, "accounts.json"))
if err != nil {
return nil, err
}
return &Chain{
genesis: gen,
blocks: blocks,
state: state,
senders: accounts,
config: gen.Config,
}, nil
}
// senderInfo is an account record as output in the "accounts.json" file from
// hivechain.
type senderInfo struct {
Key *ecdsa.PrivateKey `json:"key"`
Nonce uint64 `json:"nonce"`
}
// Head returns the chain head.
func (c *Chain) Head() *types.Block {
return c.blocks[c.Len()-1]
}
// AccountsInHashOrder returns all accounts of the head state, ordered by hash of address.
func (c *Chain) AccountsInHashOrder() []state.DumpAccount {
list := make([]state.DumpAccount, len(c.state))
i := 0
for addr, acc := range c.state {
addr := addr
list[i] = acc
list[i].Address = &addr
if len(acc.AddressHash) != 32 {
panic(fmt.Errorf("missing/invalid SecureKey in dump account %v", addr))
}
i++
}
slices.SortFunc(list, func(x, y state.DumpAccount) int {
return bytes.Compare(x.AddressHash, y.AddressHash)
})
return list
}
// CodeHashes returns all bytecode hashes contained in the head state.
func (c *Chain) CodeHashes() []common.Hash {
var hashes []common.Hash
seen := make(map[common.Hash]struct{})
seen[types.EmptyCodeHash] = struct{}{}
for _, acc := range c.state {
h := common.BytesToHash(acc.CodeHash)
if _, ok := seen[h]; ok {
continue
}
hashes = append(hashes, h)
seen[h] = struct{}{}
}
slices.SortFunc(hashes, (common.Hash).Cmp)
return hashes
}
// Len returns the length of the chain.
func (c *Chain) Len() int {
return len(c.blocks)
}
// ForkID gets the fork id of the chain.
func (c *Chain) ForkID() forkid.ID {
return forkid.NewID(c.config, c.blocks[0], uint64(c.Len()), c.blocks[c.Len()-1].Time())
}
// TD calculates the total difficulty of the chain at the
// chain head.
func (c *Chain) TD() *big.Int {
sum := new(big.Int)
for _, block := range c.blocks[:c.Len()] {
sum.Add(sum, block.Difficulty())
}
return sum
}
// GetBlock returns the block at the specified number.
func (c *Chain) GetBlock(number int) *types.Block {
return c.blocks[number]
}
// RootAt returns the state root for the block at the given height.
func (c *Chain) RootAt(height int) common.Hash {
if height < c.Len() {
return c.blocks[height].Root()
}
return common.Hash{}
}
// GetSender returns the address associated with account at the index in the
// pre-funded accounts list.
func (c *Chain) GetSender(idx int) (common.Address, uint64) {
var accounts Addresses
for addr := range c.senders {
accounts = append(accounts, addr)
}
sort.Sort(accounts)
addr := accounts[idx]
return addr, c.senders[addr].Nonce
}
// IncNonce increases the specified signing account's pending nonce.
func (c *Chain) IncNonce(addr common.Address, amt uint64) {
if _, ok := c.senders[addr]; !ok {
panic("nonce increment for non-signer")
}
c.senders[addr].Nonce += amt
}
// Balance returns the balance of an account at the head of the chain.
func (c *Chain) Balance(addr common.Address) *big.Int {
bal := new(big.Int)
if acc, ok := c.state[addr]; ok {
bal, _ = bal.SetString(acc.Balance, 10)
}
return bal
}
// SignTx signs a transaction for the specified from account, so long as that
// account was in the hivechain accounts dump.
func (c *Chain) SignTx(from common.Address, tx *types.Transaction) (*types.Transaction, error) {
signer := types.LatestSigner(c.config)
acc, ok := c.senders[from]
if !ok {
return nil, fmt.Errorf("account not available for signing: %s", from)
}
return types.SignTx(tx, signer, acc.Key)
}
// GetHeaders returns the headers base on an ethGetPacketHeadersPacket.
func (c *Chain) GetHeaders(req *eth.GetBlockHeadersPacket) ([]*types.Header, error) {
if req.Amount < 1 {
return nil, errors.New("no block headers requested")
}
var (
headers = make([]*types.Header, req.Amount)
blockNumber uint64
)
// Range over blocks to check if our chain has the requested header.
for _, block := range c.blocks {
if block.Hash() == req.Origin.Hash || block.Number().Uint64() == req.Origin.Number {
headers[0] = block.Header()
blockNumber = block.Number().Uint64()
}
}
if headers[0] == nil {
return nil, fmt.Errorf("no headers found for given origin number %v, hash %v", req.Origin.Number, req.Origin.Hash)
}
if req.Reverse {
for i := 1; i < int(req.Amount); i++ {
blockNumber -= (1 - req.Skip)
headers[i] = c.blocks[blockNumber].Header()
}
return headers, nil
}
for i := 1; i < int(req.Amount); i++ {
blockNumber += (1 + req.Skip)
headers[i] = c.blocks[blockNumber].Header()
}
return headers, nil
}
// Shorten returns a copy chain of a desired height from the imported
func (c *Chain) Shorten(height int) *Chain {
blocks := make([]*types.Block, height)
copy(blocks, c.blocks[:height])
config := *c.config
return &Chain{
blocks: blocks,
config: &config,
}
}
func loadGenesis(genesisFile string) (core.Genesis, error) {
chainConfig, err := os.ReadFile(genesisFile)
if err != nil {
return core.Genesis{}, err
}
var gen core.Genesis
if err := json.Unmarshal(chainConfig, &gen); err != nil {
return core.Genesis{}, err
}
return gen, nil
}
type Addresses []common.Address
func (a Addresses) Len() int {
return len(a)
}
func (a Addresses) Less(i, j int) bool {
return bytes.Compare(a[i][:], a[j][:]) < 0
}
func (a Addresses) Swap(i, j int) {
tmp := a[i]
a[i] = a[j]
a[j] = tmp
}
func blocksFromFile(chainfile string, gblock *types.Block) ([]*types.Block, error) {
// Load chain.rlp.
fh, err := os.Open(chainfile)
if err != nil {
return nil, err
}
defer fh.Close()
var reader io.Reader = fh
if strings.HasSuffix(chainfile, ".gz") {
if reader, err = gzip.NewReader(reader); err != nil {
return nil, err
}
}
stream := rlp.NewStream(reader, 0)
var blocks = make([]*types.Block, 1)
blocks[0] = gblock
for i := 0; ; i++ {
var b types.Block
if err := stream.Decode(&b); err == io.EOF {
break
} else if err != nil {
return nil, fmt.Errorf("at block index %d: %v", i, err)
}
if b.NumberU64() != uint64(i+1) {
return nil, fmt.Errorf("block at index %d has wrong number %d", i, b.NumberU64())
}
blocks = append(blocks, &b)
}
return blocks, nil
}
func readState(file string) (map[common.Address]state.DumpAccount, error) {
f, err := os.ReadFile(file)
if err != nil {
return nil, fmt.Errorf("unable to read state: %v", err)
}
var dump state.Dump
if err := json.Unmarshal(f, &dump); err != nil {
return nil, fmt.Errorf("unable to unmarshal state: %v", err)
}
state := make(map[common.Address]state.DumpAccount)
for key, acct := range dump.Accounts {
var addr common.Address
if err := addr.UnmarshalText([]byte(key)); err != nil {
return nil, fmt.Errorf("invalid address %q", key)
}
state[addr] = acct
}
return state, nil
}
func readAccounts(file string) (map[common.Address]*senderInfo, error) {
f, err := os.ReadFile(file)
if err != nil {
return nil, fmt.Errorf("unable to read state: %v", err)
}
type account struct {
Key hexutil.Bytes `json:"key"`
}
keys := make(map[common.Address]account)
if err := json.Unmarshal(f, &keys); err != nil {
return nil, fmt.Errorf("unable to unmarshal accounts: %v", err)
}
accounts := make(map[common.Address]*senderInfo)
for addr, acc := range keys {
pk, err := crypto.HexToECDSA(common.Bytes2Hex(acc.Key))
if err != nil {
return nil, fmt.Errorf("unable to read private key for %s: %v", err, addr)
}
accounts[addr] = &senderInfo{Key: pk, Nonce: 0}
}
return accounts, nil
}