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283 lines
10 KiB
Go
283 lines
10 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/consensus"
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"github.com/ethereum/go-ethereum/consensus/misc"
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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/core/vm"
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"github.com/ethereum/go-ethereum/ethdb"
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"github.com/ethereum/go-ethereum/params"
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)
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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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chainReader consensus.ChainReader
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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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config *params.ChainConfig
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engine consensus.Engine
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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.Prepare(tx.Hash(), common.Hash{}, len(b.txs))
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receipt, _, err := ApplyTransaction(b.config, nil, &b.header.Coinbase, b.gasPool, b.statedb, b.header, tx, &b.header.GasUsed, vm.Config{})
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if err != nil {
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panic(err)
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}
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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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// AddUncheckedReceipt forcefully adds a receipts to the block without a
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// backing transaction.
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//
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// AddUncheckedReceipt will cause consensus failures when used during real
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// chain processing. This is best used in conjunction 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.Exist(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 = b.engine.CalcDifficulty(b.chainReader, b.header.Time.Uint64(), b.parent.Header())
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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(config *params.ChainConfig, parent *types.Block, engine consensus.Engine, db ethdb.Database, n int, gen func(int, *BlockGen)) ([]*types.Block, []types.Receipts) {
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if config == nil {
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config = params.TestChainConfig
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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, parent *types.Block, statedb *state.StateDB) (*types.Block, types.Receipts) {
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// TODO(karalabe): This is needed for clique, which depends on multiple blocks.
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// It's nonetheless ugly to spin up a blockchain here. Get rid of this somehow.
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blockchain, _ := NewBlockChain(db, config, engine, vm.Config{})
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defer blockchain.Stop()
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b := &BlockGen{i: i, parent: parent, chain: blocks, chainReader: blockchain, statedb: statedb, config: config, engine: engine}
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b.header = makeHeader(b.chainReader, parent, statedb, b.engine)
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// Mutate the state and block according to any hard-fork specs
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if daoBlock := config.DAOForkBlock; daoBlock != nil {
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limit := new(big.Int).Add(daoBlock, params.DAOForkExtraRange)
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if b.header.Number.Cmp(daoBlock) >= 0 && b.header.Number.Cmp(limit) < 0 {
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if config.DAOForkSupport {
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b.header.Extra = common.CopyBytes(params.DAOForkBlockExtra)
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}
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}
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}
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if config.DAOForkSupport && config.DAOForkBlock != nil && config.DAOForkBlock.Cmp(b.header.Number) == 0 {
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misc.ApplyDAOHardFork(statedb)
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}
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// Execute any user modifications to the block and finalize it
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if gen != nil {
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gen(i, b)
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}
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if b.engine != nil {
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block, _ := b.engine.Finalize(b.chainReader, b.header, statedb, b.txs, b.uncles, b.receipts)
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// Write state changes to db
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_, err := statedb.CommitTo(db, config.IsEIP158(b.header.Number))
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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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return block, b.receipts
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}
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return nil, nil
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}
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for i := 0; i < n; i++ {
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statedb, err := state.New(parent.Root(), state.NewDatabase(db))
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if err != nil {
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panic(err)
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}
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block, receipt := genblock(i, parent, statedb)
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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(chain consensus.ChainReader, parent *types.Block, state *state.StateDB, engine consensus.Engine) *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(chain.Config().IsEIP158(parent.Number())),
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ParentHash: parent.Hash(),
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Coinbase: parent.Coinbase(),
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Difficulty: engine.CalcDifficulty(chain, time.Uint64(), &types.Header{
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Number: parent.Number(),
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Time: new(big.Int).Sub(time, big.NewInt(10)),
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Difficulty: parent.Difficulty(),
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UncleHash: parent.UncleHash(),
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}),
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GasLimit: CalcGasLimit(parent),
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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(engine consensus.Engine, n int, full bool) (ethdb.Database, *BlockChain, error) {
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// Initialize a fresh chain with only a genesis block
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gspec := new(Genesis)
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db, _ := ethdb.NewMemDatabase()
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genesis := gspec.MustCommit(db)
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blockchain, _ := NewBlockChain(db, params.AllEthashProtocolChanges, engine, vm.Config{})
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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, engine, 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, engine, 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, engine consensus.Engine, db ethdb.Database, seed int) []*types.Header {
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blocks := makeBlockChain(types.NewBlockWithHeader(parent), n, engine, 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, engine consensus.Engine, db ethdb.Database, seed int) []*types.Block {
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blocks, _ := GenerateChain(params.TestChainConfig, parent, engine, 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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