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86 lines
3.5 KiB
Go
86 lines
3.5 KiB
Go
// Copyright 2019 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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"sync/atomic"
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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/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/params"
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)
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// statePrefetcher is a basic Prefetcher, which blindly executes a block on top
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// of an arbitrary state with the goal of prefetching potentially useful state
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// data from disk before the main block processor start executing.
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type statePrefetcher struct {
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config *params.ChainConfig // Chain configuration options
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bc *BlockChain // Canonical block chain
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engine consensus.Engine // Consensus engine used for block rewards
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}
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// newStatePrefetcher initialises a new statePrefetcher.
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func newStatePrefetcher(config *params.ChainConfig, bc *BlockChain, engine consensus.Engine) *statePrefetcher {
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return &statePrefetcher{
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config: config,
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bc: bc,
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engine: engine,
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}
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}
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// Prefetch processes the state changes according to the Ethereum rules by running
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// the transaction messages using the statedb, but any changes are discarded. The
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// only goal is to pre-cache transaction signatures and state trie nodes.
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func (p *statePrefetcher) Prefetch(block *types.Block, statedb *state.StateDB, cfg vm.Config, interrupt *uint32) {
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var (
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header = block.Header()
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gaspool = new(GasPool).AddGas(block.GasLimit())
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)
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// Iterate over and process the individual transactions
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for i, tx := range block.Transactions() {
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// If block precaching was interrupted, abort
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if interrupt != nil && atomic.LoadUint32(interrupt) == 1 {
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return
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}
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// Block precaching permitted to continue, execute the transaction
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statedb.Prepare(tx.Hash(), block.Hash(), i)
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if err := precacheTransaction(p.config, p.bc, nil, gaspool, statedb, header, tx, cfg); err != nil {
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return // Ugh, something went horribly wrong, bail out
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}
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}
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}
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// precacheTransaction attempts to apply a transaction to the given state database
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// and uses the input parameters for its environment. The goal is not to execute
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// the transaction successfully, rather to warm up touched data slots.
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func precacheTransaction(config *params.ChainConfig, bc ChainContext, author *common.Address, gaspool *GasPool, statedb *state.StateDB, header *types.Header, tx *types.Transaction, cfg vm.Config) error {
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// Convert the transaction into an executable message and pre-cache its sender
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msg, err := tx.AsMessage(types.MakeSigner(config, header.Number))
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if err != nil {
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return err
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}
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// Create the EVM and execute the transaction
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context := NewEVMContext(msg, header, bc, author)
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vm := vm.NewEVM(context, statedb, config, cfg)
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_, _, _, err = ApplyMessage(vm, msg, gaspool)
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return err
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}
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