76 lines
3.3 KiB
Go
76 lines
3.3 KiB
Go
// Copyright 2021 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 les
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import (
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"context"
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"errors"
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"fmt"
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"github.com/ethereum/go-ethereum/core"
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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/light"
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)
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// stateAtBlock retrieves the state database associated with a certain block.
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func (leth *LightEthereum) stateAtBlock(ctx context.Context, block *types.Block, reexec uint64) (*state.StateDB, error) {
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return light.NewState(ctx, block.Header(), leth.odr), nil
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}
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// stateAtTransaction returns the execution environment of a certain transaction.
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func (leth *LightEthereum) stateAtTransaction(ctx context.Context, block *types.Block, txIndex int, reexec uint64) (core.Message, vm.BlockContext, *state.StateDB, error) {
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// Short circuit if it's genesis block.
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if block.NumberU64() == 0 {
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return nil, vm.BlockContext{}, nil, errors.New("no transaction in genesis")
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}
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// Create the parent state database
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parent, err := leth.blockchain.GetBlock(ctx, block.ParentHash(), block.NumberU64()-1)
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if err != nil {
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return nil, vm.BlockContext{}, nil, err
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}
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statedb, err := leth.stateAtBlock(ctx, parent, reexec)
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if err != nil {
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return nil, vm.BlockContext{}, nil, err
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}
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if txIndex == 0 && len(block.Transactions()) == 0 {
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return nil, vm.BlockContext{}, statedb, nil
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}
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// Recompute transactions up to the target index.
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signer := types.MakeSigner(leth.blockchain.Config(), block.Number())
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for idx, tx := range block.Transactions() {
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// Assemble the transaction call message and return if the requested offset
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msg, _ := tx.AsMessage(signer)
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txContext := core.NewEVMTxContext(msg)
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context := core.NewEVMBlockContext(block.Header(), leth.blockchain, nil)
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statedb.Prepare(tx.Hash(), block.Hash(), idx)
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if idx == txIndex {
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return msg, context, statedb, nil
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}
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// Not yet the searched for transaction, execute on top of the current state
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vmenv := vm.NewEVM(context, txContext, statedb, leth.blockchain.Config(), vm.Config{})
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if _, err := core.ApplyMessage(vmenv, msg, new(core.GasPool).AddGas(tx.Gas())); err != nil {
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return nil, vm.BlockContext{}, nil, fmt.Errorf("transaction %#x failed: %v", tx.Hash(), err)
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}
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// Ensure any modifications are committed to the state
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// Only delete empty objects if EIP158/161 (a.k.a Spurious Dragon) is in effect
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statedb.Finalise(vmenv.ChainConfig().IsEIP158(block.Number()))
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}
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return nil, vm.BlockContext{}, nil, fmt.Errorf("transaction index %d out of range for block %#x", txIndex, block.Hash())
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}
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