2016-04-14 09:18:24 -07:00
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// 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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2015-10-19 07:08:17 -07:00
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package core
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import (
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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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)
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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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)
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2016-03-01 14:32:43 -08:00
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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, publicState, privateState *state.StateDB, cfg vm.Config) (types.Receipts, types.Receipts, vm.Logs, *big.Int, error) {
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var (
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publicReceipts types.Receipts
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privateReceipts 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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publicState.StartRecord(tx.Hash(), block.Hash(), i)
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privateState.StartRecord(tx.Hash(), block.Hash(), i)
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publicReceipt, privateReceipt, _, err := ApplyTransaction(p.config, p.bc, gp, publicState, privateState, header, tx, totalUsedGas, cfg)
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if err != nil {
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return nil, nil, nil, totalUsedGas, err
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}
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publicReceipts = append(publicReceipts, publicReceipt)
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allLogs = append(allLogs, publicReceipt.Logs...)
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// if the private receipt is nil this means the tx was public
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// and we do not need to apply the additional logic.
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if privateReceipt != nil {
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privateReceipts = append(privateReceipts, privateReceipt)
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allLogs = append(allLogs, privateReceipt.Logs...)
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}
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}
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AccumulateRewards(publicState, header, block.Uncles())
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return publicReceipts, privateReceipts, 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, publicState, privateState *state.StateDB, header *types.Header, tx *types.Transaction, usedGas *big.Int, cfg vm.Config) (*types.Receipt, *types.Receipt, *big.Int, error) {
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if !tx.IsPrivate() {
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privateState = publicState
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}
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if tx.GasPrice() != nil && tx.GasPrice().Cmp(common.Big0) > 0 {
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return nil, nil, nil, ErrInvalidGasPrice
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}
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_, gas, err := ApplyMessage(NewEnv(publicState, privateState, config, bc, tx, header, cfg), 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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// Update the state with pending changes
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usedGas.Add(usedGas, gas)
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publicReceipt := types.NewReceipt(publicState.IntermediateRoot().Bytes(), usedGas)
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publicReceipt.TxHash = tx.Hash()
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publicReceipt.GasUsed = new(big.Int).Set(gas)
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if MessageCreatesContract(tx) {
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from, _ := tx.From()
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publicReceipt.ContractAddress = crypto.CreateAddress(from, tx.Nonce())
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}
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logs := publicState.GetLogs(tx.Hash())
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publicReceipt.Logs = logs
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publicReceipt.Bloom = types.CreateBloom(types.Receipts{publicReceipt})
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var privateReceipt *types.Receipt
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if tx.IsPrivate() {
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privateReceipt = types.NewReceipt(privateState.IntermediateRoot().Bytes(), usedGas)
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privateReceipt.TxHash = tx.Hash()
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privateReceipt.GasUsed = new(big.Int).Set(gas)
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if MessageCreatesContract(tx) {
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from, _ := tx.From()
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privateReceipt.ContractAddress = crypto.CreateAddress(from, tx.Nonce())
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}
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logs := privateState.GetLogs(tx.Hash())
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privateReceipt.Logs = logs
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privateReceipt.Bloom = types.CreateBloom(types.Receipts{privateReceipt})
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}
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return publicReceipt, privateReceipt, 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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