84 lines
3.2 KiB
Go
84 lines
3.2 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/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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chain *HeaderChain // Canonical block chain
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}
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// newStatePrefetcher initialises a new statePrefetcher.
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func newStatePrefetcher(config *params.ChainConfig, chain *HeaderChain) *statePrefetcher {
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return &statePrefetcher{
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config: config,
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chain: chain,
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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 *atomic.Bool) {
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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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blockContext = NewEVMBlockContext(header, p.chain, nil)
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evm = vm.NewEVM(blockContext, statedb, p.config, cfg)
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signer = types.MakeSigner(p.config, header.Number, header.Time)
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)
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// Iterate over and process the individual transactions
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byzantium := p.config.IsByzantium(block.Number())
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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 && interrupt.Load() {
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return
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}
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// Convert the transaction into an executable message and pre-cache its sender
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msg, err := TransactionToMessage(tx, signer, header.BaseFee)
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if err != nil {
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return // Also invalid block, bail out
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}
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statedb.SetTxContext(tx.Hash(), i)
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// We attempt to apply a transaction. The goal is not to execute
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// the transaction successfully, rather to warm up touched data slots.
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if _, err := ApplyMessage(evm, msg, gaspool); err != nil {
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return // Ugh, something went horribly wrong, bail out
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}
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// If we're pre-byzantium, pre-load trie nodes for the intermediate root
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if !byzantium {
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statedb.IntermediateRoot(true)
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}
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}
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// If were post-byzantium, pre-load trie nodes for the final root hash
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if byzantium {
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statedb.IntermediateRoot(true)
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}
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}
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