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201 lines
7.3 KiB
Go
201 lines
7.3 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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"errors"
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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/core/vm"
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"github.com/ethereum/go-ethereum/crypto"
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"github.com/ethereum/go-ethereum/logger"
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"github.com/ethereum/go-ethereum/logger/glog"
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)
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var (
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big8 = big.NewInt(8)
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big32 = big.NewInt(32)
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blockedCodeHashErr = errors.New("core: blocked code-hash found during execution")
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// DAO attack chain rupture mechanism
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ruptureBlock = uint64(1760000) // Block number of the voted soft fork
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ruptureThreshold = big.NewInt(4000000) // Gas threshold for passing a fork vote
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ruptureGasCache = make(map[common.Hash]*big.Int) // Amount of gas in the point of rupture
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ruptureCodeHashes = map[common.Hash]struct{}{
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common.HexToHash("6a5d24750f78441e56fec050dc52fe8e911976485b7472faac7464a176a67caa"): struct{}{},
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}
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ruptureWhitelist = map[common.Address]bool{
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common.HexToAddress("Da4a4626d3E16e094De3225A751aAb7128e96526"): true, // multisig
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common.HexToAddress("2ba9D006C1D72E67A70b5526Fc6b4b0C0fd6D334"): true, // attack contract
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}
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ruptureCacheLimit = 30000 // 1 epoch, 0.5 per possible fork
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)
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// StateProcessor is a basic Processor, which takes care of transitioning
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// state from one point to another.
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//
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// StateProcessor implements Processor.
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type StateProcessor struct {
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config *ChainConfig
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bc *BlockChain
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}
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// NewStateProcessor initialises a new StateProcessor.
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func NewStateProcessor(config *ChainConfig, bc *BlockChain) *StateProcessor {
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return &StateProcessor{
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config: config,
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bc: bc,
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}
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}
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// Process processes the state changes according to the Ethereum rules by running
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// the transaction messages using the statedb and applying any rewards to both
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// the processor (coinbase) and any included uncles.
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//
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// Process returns the receipts and logs accumulated during the process and
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// returns the amount of gas that was used in the process. If any of the
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// transactions failed to execute due to insufficient gas it will return an error.
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func (p *StateProcessor) Process(block *types.Block, statedb *state.StateDB, cfg vm.Config) (types.Receipts, vm.Logs, *big.Int, error) {
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var (
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receipts types.Receipts
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totalUsedGas = big.NewInt(0)
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err error
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header = block.Header()
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allLogs vm.Logs
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gp = new(GasPool).AddGas(block.GasLimit())
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)
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for i, tx := range block.Transactions() {
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statedb.StartRecord(tx.Hash(), block.Hash(), i)
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receipt, logs, _, err := ApplyTransaction(p.config, p.bc, gp, statedb, header, tx, totalUsedGas, cfg)
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if err != nil {
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return nil, nil, totalUsedGas, err
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}
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receipts = append(receipts, receipt)
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allLogs = append(allLogs, logs...)
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}
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AccumulateRewards(statedb, header, block.Uncles())
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return receipts, allLogs, totalUsedGas, err
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}
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// ApplyTransaction attempts to apply a transaction to the given state database
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// and uses the input parameters for its environment.
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//
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// ApplyTransactions returns the generated receipts and vm logs during the
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// execution of the state transition phase.
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func ApplyTransaction(config *ChainConfig, bc *BlockChain, gp *GasPool, statedb *state.StateDB, header *types.Header, tx *types.Transaction, usedGas *big.Int, cfg vm.Config) (*types.Receipt, vm.Logs, *big.Int, error) {
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env := NewEnv(statedb, config, bc, tx, header, cfg)
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_, gas, err := ApplyMessage(env, tx, gp)
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if err != nil {
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return nil, nil, nil, err
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}
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// Check whether the DAO needs to be blocked or not
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if bc != nil { // Test chain maker uses nil to construct the potential chain
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blockRuptureCodes := false
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if number := header.Number.Uint64(); number >= ruptureBlock {
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// We're past the rupture point, find the vote result on this chain and apply it
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ancestry := []common.Hash{header.Hash(), header.ParentHash}
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for _, ok := ruptureGasCache[ancestry[len(ancestry)-1]]; !ok && number >= ruptureBlock+uint64(len(ancestry)); {
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ancestry = append(ancestry, bc.GetHeaderByHash(ancestry[len(ancestry)-1]).ParentHash)
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}
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decider := ancestry[len(ancestry)-1]
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vote, ok := ruptureGasCache[decider]
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if !ok {
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// We've reached the rupture point, retrieve the vote
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vote = bc.GetHeaderByHash(decider).GasLimit
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ruptureGasCache[decider] = vote
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}
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// Cache the vote result for all ancestors and check the DAO
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for _, hash := range ancestry {
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ruptureGasCache[hash] = vote
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}
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if ruptureGasCache[ancestry[0]].Cmp(ruptureThreshold) <= 0 {
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blockRuptureCodes = true
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}
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// Make sure we don't OOM long run due to too many votes caching up
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for len(ruptureGasCache) > ruptureCacheLimit {
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for hash, _ := range ruptureGasCache {
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delete(ruptureGasCache, hash)
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break
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}
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}
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}
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// Iterate over the bullshit blacklist to keep waste some time while keeping random Joe's happy
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if len(BlockedCodeHashes) > 0 {
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for hash, _ := range env.GetMarkedCodeHashes() {
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// Figure out whether this contract should in general be blocked
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if _, blocked := BlockedCodeHashes[hash]; blocked {
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return nil, nil, nil, blockedCodeHashErr
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}
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}
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}
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// Actually verify the DAO soft fork
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recipient := tx.To()
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if blockRuptureCodes && (recipient == nil || !ruptureWhitelist[*recipient]) {
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for hash, _ := range env.GetMarkedCodeHashes() {
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if _, blocked := ruptureCodeHashes[hash]; blocked {
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return nil, nil, nil, blockedCodeHashErr
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}
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}
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}
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}
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// Update the state with pending changes
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usedGas.Add(usedGas, gas)
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receipt := types.NewReceipt(statedb.IntermediateRoot().Bytes(), usedGas)
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receipt.TxHash = tx.Hash()
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receipt.GasUsed = new(big.Int).Set(gas)
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if MessageCreatesContract(tx) {
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from, _ := tx.From()
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receipt.ContractAddress = crypto.CreateAddress(from, tx.Nonce())
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}
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logs := statedb.GetLogs(tx.Hash())
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receipt.Logs = logs
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receipt.Bloom = types.CreateBloom(types.Receipts{receipt})
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glog.V(logger.Debug).Infoln(receipt)
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return receipt, logs, gas, err
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}
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// AccumulateRewards credits the coinbase of the given block with the
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// mining reward. The total reward consists of the static block reward
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// and rewards for included uncles. The coinbase of each uncle block is
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// also rewarded.
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func AccumulateRewards(statedb *state.StateDB, header *types.Header, uncles []*types.Header) {
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reward := new(big.Int).Set(BlockReward)
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r := new(big.Int)
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for _, uncle := range uncles {
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r.Add(uncle.Number, big8)
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r.Sub(r, header.Number)
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r.Mul(r, BlockReward)
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r.Div(r, big8)
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statedb.AddBalance(uncle.Coinbase, r)
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r.Div(BlockReward, big32)
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reward.Add(reward, r)
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}
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statedb.AddBalance(header.Coinbase, reward)
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}
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