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- // Copyright 2021 The go-ethereum Authors
- // This file is part of the go-ethereum library.
- //
- // The go-ethereum library is free software: you can redistribute it and/or modify
- // it under the terms of the GNU Lesser General Public License as published by
- // the Free Software Foundation, either version 3 of the License, or
- // (at your option) any later version.
- //
- // The go-ethereum library is distributed in the hope that it will be useful,
- // but WITHOUT ANY WARRANTY; without even the implied warranty of
- // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- // GNU Lesser General Public License for more details.
- //
- // You should have received a copy of the GNU Lesser General Public License
- // along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
- package les
- import (
- "context"
- "errors"
- "fmt"
- "github.com/ethereum/go-ethereum/core"
- "github.com/ethereum/go-ethereum/core/mps"
- "github.com/ethereum/go-ethereum/core/state"
- "github.com/ethereum/go-ethereum/core/types"
- "github.com/ethereum/go-ethereum/core/vm"
- "github.com/ethereum/go-ethereum/light"
- )
- // stateAtBlock retrieves the state database associated with a certain block.
- func (leth *LightEthereum) stateAtBlock(ctx context.Context, block *types.Block, reexec uint64) (*state.StateDB, mps.PrivateStateRepository, error) {
- return light.NewState(ctx, block.Header(), leth.odr), nil, nil
- }
- // stateAtTransaction returns the execution environment of a certain transaction.
- func (leth *LightEthereum) stateAtTransaction(ctx context.Context, block *types.Block, txIndex int, reexec uint64) (core.Message, vm.BlockContext, *state.StateDB, *state.StateDB, mps.PrivateStateRepository, error) {
- // Short circuit if it's genesis block.
- if block.NumberU64() == 0 {
- return nil, vm.BlockContext{}, nil, nil, nil, errors.New("no transaction in genesis")
- }
- // Create the parent state database
- parent, err := leth.blockchain.GetBlock(ctx, block.ParentHash(), block.NumberU64()-1)
- if err != nil {
- return nil, vm.BlockContext{}, nil, nil, nil, err
- }
- statedb, private, err := leth.stateAtBlock(ctx, parent, reexec)
- if err != nil {
- return nil, vm.BlockContext{}, nil, nil, nil, err
- }
- privateStateDb, err := private.DefaultState()
- if err != nil {
- return nil, vm.BlockContext{}, nil, nil, nil, err
- }
- if txIndex == 0 && len(block.Transactions()) == 0 {
- return nil, vm.BlockContext{}, statedb, privateStateDb, private, nil
- }
- // Recompute transactions up to the target index.
- signer := types.MakeSigner(leth.blockchain.Config(), block.Number())
- for idx, tx := range block.Transactions() {
- // Assemble the transaction call message and return if the requested offset
- msg, _ := tx.AsMessage(signer)
- txContext := core.NewEVMTxContext(msg)
- context := core.NewEVMBlockContext(block.Header(), leth.blockchain, nil)
- statedb.Prepare(tx.Hash(), block.Hash(), idx)
- privateStateDb.Prepare(tx.Hash(), block.Hash(), idx)
- if idx == txIndex {
- return msg, context, statedb, statedb, nil, nil
- }
- // Not yet the searched for transaction, execute on top of the current state
- vmenv := vm.NewEVM(context, txContext, statedb, privateStateDb, leth.blockchain.Config(), vm.Config{})
- if _, err := core.ApplyMessage(vmenv, msg, new(core.GasPool).AddGas(tx.Gas())); err != nil {
- return nil, vm.BlockContext{}, nil, nil, nil, fmt.Errorf("transaction %#x failed: %v", tx.Hash(), err)
- }
- // Ensure any modifications are committed to the state
- // Only delete empty objects if EIP158/161 (a.k.a Spurious Dragon) is in effect
- statedb.Finalise(vmenv.ChainConfig().IsEIP158(block.Number()))
- }
- return nil, vm.BlockContext{}, nil, nil, nil, fmt.Errorf("transaction index %d out of range for block %#x", txIndex, block.Hash())
- }
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