github.com/cryptotooltop/go-ethereum@v0.0.0-20231103184714-151d1922f3e5/core/state_prefetcher.go (about)

     1  // Copyright 2019 The go-ethereum Authors
     2  // This file is part of the go-ethereum library.
     3  //
     4  // The go-ethereum library is free software: you can redistribute it and/or modify
     5  // it under the terms of the GNU Lesser General Public License as published by
     6  // the Free Software Foundation, either version 3 of the License, or
     7  // (at your option) any later version.
     8  //
     9  // The go-ethereum library is distributed in the hope that it will be useful,
    10  // but WITHOUT ANY WARRANTY; without even the implied warranty of
    11  // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
    12  // GNU Lesser General Public License for more details.
    13  //
    14  // You should have received a copy of the GNU Lesser General Public License
    15  // along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
    16  
    17  package core
    18  
    19  import (
    20  	"math/big"
    21  	"sync/atomic"
    22  
    23  	"github.com/scroll-tech/go-ethereum/consensus"
    24  	"github.com/scroll-tech/go-ethereum/core/state"
    25  	"github.com/scroll-tech/go-ethereum/core/types"
    26  	"github.com/scroll-tech/go-ethereum/core/vm"
    27  	"github.com/scroll-tech/go-ethereum/params"
    28  	"github.com/scroll-tech/go-ethereum/rollup/fees"
    29  )
    30  
    31  // statePrefetcher is a basic Prefetcher, which blindly executes a block on top
    32  // of an arbitrary state with the goal of prefetching potentially useful state
    33  // data from disk before the main block processor start executing.
    34  type statePrefetcher struct {
    35  	config *params.ChainConfig // Chain configuration options
    36  	bc     *BlockChain         // Canonical block chain
    37  	engine consensus.Engine    // Consensus engine used for block rewards
    38  }
    39  
    40  // newStatePrefetcher initialises a new statePrefetcher.
    41  func newStatePrefetcher(config *params.ChainConfig, bc *BlockChain, engine consensus.Engine) *statePrefetcher {
    42  	return &statePrefetcher{
    43  		config: config,
    44  		bc:     bc,
    45  		engine: engine,
    46  	}
    47  }
    48  
    49  // Prefetch processes the state changes according to the Ethereum rules by running
    50  // the transaction messages using the statedb, but any changes are discarded. The
    51  // only goal is to pre-cache transaction signatures and state trie nodes.
    52  func (p *statePrefetcher) Prefetch(block *types.Block, statedb *state.StateDB, cfg vm.Config, interrupt *uint32) {
    53  	var (
    54  		header       = block.Header()
    55  		gaspool      = new(GasPool).AddGas(block.GasLimit())
    56  		blockContext = NewEVMBlockContext(header, p.bc, p.config, nil)
    57  		evm          = vm.NewEVM(blockContext, vm.TxContext{}, statedb, p.config, cfg)
    58  		signer       = types.MakeSigner(p.config, header.Number)
    59  	)
    60  	// Iterate over and process the individual transactions
    61  	byzantium := p.config.IsByzantium(block.Number())
    62  	for i, tx := range block.Transactions() {
    63  		// If block precaching was interrupted, abort
    64  		if interrupt != nil && atomic.LoadUint32(interrupt) == 1 {
    65  			return
    66  		}
    67  		// Convert the transaction into an executable message and pre-cache its sender
    68  		msg, err := tx.AsMessage(signer, header.BaseFee)
    69  		if err != nil {
    70  			return // Also invalid block, bail out
    71  		}
    72  		statedb.Prepare(tx.Hash(), i)
    73  
    74  		l1DataFee, err := fees.CalculateL1DataFee(tx, statedb)
    75  		if err != nil {
    76  			return
    77  		}
    78  
    79  		if err = precacheTransaction(msg, p.config, gaspool, statedb, header, evm, l1DataFee); err != nil {
    80  			return // Ugh, something went horribly wrong, bail out
    81  		}
    82  		// If we're pre-byzantium, pre-load trie nodes for the intermediate root
    83  		if !byzantium {
    84  			statedb.IntermediateRoot(true)
    85  		}
    86  	}
    87  	// If were post-byzantium, pre-load trie nodes for the final root hash
    88  	if byzantium {
    89  		statedb.IntermediateRoot(true)
    90  	}
    91  }
    92  
    93  // precacheTransaction attempts to apply a transaction to the given state database
    94  // and uses the input parameters for its environment. The goal is not to execute
    95  // the transaction successfully, rather to warm up touched data slots.
    96  func precacheTransaction(msg types.Message, config *params.ChainConfig, gaspool *GasPool, statedb *state.StateDB, header *types.Header, evm *vm.EVM, l1DataFee *big.Int) error {
    97  	// Update the evm with the new transaction context.
    98  	evm.Reset(NewEVMTxContext(msg), statedb)
    99  	// Add addresses to access list if applicable
   100  	_, err := ApplyMessage(evm, msg, gaspool, l1DataFee)
   101  	return err
   102  }