9be5d5cd90
The test chain generated by makeChainFork included invalid uncle headers, crashing the generator during the state commit. The headers were invalid because they used the iteration counter as the block number, even though makeChainFork uses a block with number > 0 as the parent. Fix this by introducing BlockGen.Number, which allows accessing the actual number of the block being generated.
264 lines
9.0 KiB
Go
264 lines
9.0 KiB
Go
// Copyright 2015 The go-ethereum Authors
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// This file is part of the go-ethereum library.
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//
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// The go-ethereum library is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Lesser General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// The go-ethereum library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public License
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// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
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package core
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import (
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"fmt"
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"math/big"
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"github.com/ethereum/go-ethereum/common"
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"github.com/ethereum/go-ethereum/core/state"
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"github.com/ethereum/go-ethereum/core/types"
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"github.com/ethereum/go-ethereum/ethdb"
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"github.com/ethereum/go-ethereum/event"
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"github.com/ethereum/go-ethereum/pow"
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)
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// FakePow is a non-validating proof of work implementation.
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// It returns true from Verify for any block.
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type FakePow struct{}
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func (f FakePow) Search(block pow.Block, stop <-chan struct{}, index int) (uint64, []byte) {
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return 0, nil
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}
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func (f FakePow) Verify(block pow.Block) bool { return true }
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func (f FakePow) GetHashrate() int64 { return 0 }
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func (f FakePow) Turbo(bool) {}
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// So we can deterministically seed different blockchains
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var (
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canonicalSeed = 1
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forkSeed = 2
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)
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// BlockGen creates blocks for testing.
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// See GenerateChain for a detailed explanation.
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type BlockGen struct {
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i int
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parent *types.Block
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chain []*types.Block
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header *types.Header
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statedb *state.StateDB
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gasPool *GasPool
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txs []*types.Transaction
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receipts []*types.Receipt
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uncles []*types.Header
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}
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// SetCoinbase sets the coinbase of the generated block.
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// It can be called at most once.
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func (b *BlockGen) SetCoinbase(addr common.Address) {
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if b.gasPool != nil {
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if len(b.txs) > 0 {
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panic("coinbase must be set before adding transactions")
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}
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panic("coinbase can only be set once")
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}
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b.header.Coinbase = addr
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b.gasPool = new(GasPool).AddGas(b.header.GasLimit)
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}
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// SetExtra sets the extra data field of the generated block.
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func (b *BlockGen) SetExtra(data []byte) {
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b.header.Extra = data
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}
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// AddTx adds a transaction to the generated block. If no coinbase has
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// been set, the block's coinbase is set to the zero address.
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//
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// AddTx panics if the transaction cannot be executed. In addition to
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// the protocol-imposed limitations (gas limit, etc.), there are some
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// further limitations on the content of transactions that can be
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// added. Notably, contract code relying on the BLOCKHASH instruction
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// will panic during execution.
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func (b *BlockGen) AddTx(tx *types.Transaction) {
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if b.gasPool == nil {
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b.SetCoinbase(common.Address{})
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}
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b.statedb.StartRecord(tx.Hash(), common.Hash{}, len(b.txs))
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_, gas, err := ApplyMessage(NewEnv(b.statedb, nil, tx, b.header), tx, b.gasPool)
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if err != nil {
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panic(err)
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}
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root := b.statedb.IntermediateRoot()
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b.header.GasUsed.Add(b.header.GasUsed, gas)
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receipt := types.NewReceipt(root.Bytes(), b.header.GasUsed)
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receipt.Logs = b.statedb.GetLogs(tx.Hash())
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receipt.Bloom = types.CreateBloom(types.Receipts{receipt})
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b.txs = append(b.txs, tx)
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b.receipts = append(b.receipts, receipt)
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}
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// Number returns the block number of the block being generated.
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func (b *BlockGen) Number() *big.Int {
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return new(big.Int).Set(b.header.Number)
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}
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// AddUncheckedReceipts forcefully adds a receipts to the block without a
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// backing transaction.
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//
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// AddUncheckedReceipts will cause consensus failures when used during real
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// chain processing. This is best used in conjuction with raw block insertion.
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func (b *BlockGen) AddUncheckedReceipt(receipt *types.Receipt) {
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b.receipts = append(b.receipts, receipt)
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}
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// TxNonce returns the next valid transaction nonce for the
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// account at addr. It panics if the account does not exist.
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func (b *BlockGen) TxNonce(addr common.Address) uint64 {
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if !b.statedb.HasAccount(addr) {
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panic("account does not exist")
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}
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return b.statedb.GetNonce(addr)
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}
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// AddUncle adds an uncle header to the generated block.
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func (b *BlockGen) AddUncle(h *types.Header) {
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b.uncles = append(b.uncles, h)
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}
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// PrevBlock returns a previously generated block by number. It panics if
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// num is greater or equal to the number of the block being generated.
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// For index -1, PrevBlock returns the parent block given to GenerateChain.
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func (b *BlockGen) PrevBlock(index int) *types.Block {
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if index >= b.i {
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panic("block index out of range")
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}
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if index == -1 {
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return b.parent
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}
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return b.chain[index]
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}
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// OffsetTime modifies the time instance of a block, implicitly changing its
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// associated difficulty. It's useful to test scenarios where forking is not
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// tied to chain length directly.
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func (b *BlockGen) OffsetTime(seconds int64) {
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b.header.Time.Add(b.header.Time, new(big.Int).SetInt64(seconds))
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if b.header.Time.Cmp(b.parent.Header().Time) <= 0 {
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panic("block time out of range")
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}
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b.header.Difficulty = CalcDifficulty(b.header.Time.Uint64(), b.parent.Time().Uint64(), b.parent.Number(), b.parent.Difficulty())
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}
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// GenerateChain creates a chain of n blocks. The first block's
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// parent will be the provided parent. db is used to store
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// intermediate states and should contain the parent's state trie.
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//
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// The generator function is called with a new block generator for
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// every block. Any transactions and uncles added to the generator
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// become part of the block. If gen is nil, the blocks will be empty
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// and their coinbase will be the zero address.
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//
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// Blocks created by GenerateChain do not contain valid proof of work
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// values. Inserting them into BlockChain requires use of FakePow or
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// a similar non-validating proof of work implementation.
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func GenerateChain(parent *types.Block, db ethdb.Database, n int, gen func(int, *BlockGen)) ([]*types.Block, []types.Receipts) {
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statedb, err := state.New(parent.Root(), db)
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if err != nil {
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panic(err)
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}
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blocks, receipts := make(types.Blocks, n), make([]types.Receipts, n)
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genblock := func(i int, h *types.Header) (*types.Block, types.Receipts) {
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b := &BlockGen{parent: parent, i: i, chain: blocks, header: h, statedb: statedb}
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if gen != nil {
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gen(i, b)
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}
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AccumulateRewards(statedb, h, b.uncles)
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root, err := statedb.Commit()
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if err != nil {
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panic(fmt.Sprintf("state write error: %v", err))
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}
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h.Root = root
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return types.NewBlock(h, b.txs, b.uncles, b.receipts), b.receipts
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}
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for i := 0; i < n; i++ {
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header := makeHeader(parent, statedb)
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block, receipt := genblock(i, header)
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blocks[i] = block
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receipts[i] = receipt
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parent = block
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}
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return blocks, receipts
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}
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func makeHeader(parent *types.Block, state *state.StateDB) *types.Header {
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var time *big.Int
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if parent.Time() == nil {
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time = big.NewInt(10)
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} else {
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time = new(big.Int).Add(parent.Time(), big.NewInt(10)) // block time is fixed at 10 seconds
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}
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return &types.Header{
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Root: state.IntermediateRoot(),
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ParentHash: parent.Hash(),
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Coinbase: parent.Coinbase(),
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Difficulty: CalcDifficulty(time.Uint64(), new(big.Int).Sub(time, big.NewInt(10)).Uint64(), parent.Number(), parent.Difficulty()),
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GasLimit: CalcGasLimit(parent),
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GasUsed: new(big.Int),
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Number: new(big.Int).Add(parent.Number(), common.Big1),
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Time: time,
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}
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}
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// newCanonical creates a chain database, and injects a deterministic canonical
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// chain. Depending on the full flag, if creates either a full block chain or a
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// header only chain.
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func newCanonical(n int, full bool) (ethdb.Database, *BlockChain, error) {
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// Create te new chain database
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db, _ := ethdb.NewMemDatabase()
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evmux := &event.TypeMux{}
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// Initialize a fresh chain with only a genesis block
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genesis, _ := WriteTestNetGenesisBlock(db)
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blockchain, _ := NewBlockChain(db, FakePow{}, evmux)
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// Create and inject the requested chain
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if n == 0 {
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return db, blockchain, nil
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}
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if full {
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// Full block-chain requested
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blocks := makeBlockChain(genesis, n, db, canonicalSeed)
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_, err := blockchain.InsertChain(blocks)
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return db, blockchain, err
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}
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// Header-only chain requested
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headers := makeHeaderChain(genesis.Header(), n, db, canonicalSeed)
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_, err := blockchain.InsertHeaderChain(headers, 1)
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return db, blockchain, err
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}
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// makeHeaderChain creates a deterministic chain of headers rooted at parent.
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func makeHeaderChain(parent *types.Header, n int, db ethdb.Database, seed int) []*types.Header {
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blocks := makeBlockChain(types.NewBlockWithHeader(parent), n, db, seed)
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headers := make([]*types.Header, len(blocks))
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for i, block := range blocks {
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headers[i] = block.Header()
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}
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return headers
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}
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// makeBlockChain creates a deterministic chain of blocks rooted at parent.
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func makeBlockChain(parent *types.Block, n int, db ethdb.Database, seed int) []*types.Block {
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blocks, _ := GenerateChain(parent, db, n, func(i int, b *BlockGen) {
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b.SetCoinbase(common.Address{0: byte(seed), 19: byte(i)})
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})
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return blocks
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}
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