bbc4ea4ae8
The run loop, which previously contained custom opcode executes have been removed and has been simplified to a few checks. Each operation consists of 4 elements: execution function, gas cost function, stack validation function and memory size function. The execution function implements the operation's runtime behaviour, the gas cost function implements the operation gas costs function and greatly depends on the memory and stack, the stack validation function validates the stack and makes sure that enough items can be popped off and pushed on and the memory size function calculates the memory required for the operation and returns it. This commit also allows the EVM to go unmetered. This is helpful for offline operations such as contract calls.
156 lines
5.0 KiB
Go
156 lines
5.0 KiB
Go
// Copyright 2016 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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"math/big"
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"github.com/ethereum/go-ethereum/accounts"
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"github.com/ethereum/go-ethereum/common"
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"github.com/ethereum/go-ethereum/core"
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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/eth/downloader"
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"github.com/ethereum/go-ethereum/eth/gasprice"
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"github.com/ethereum/go-ethereum/ethdb"
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"github.com/ethereum/go-ethereum/event"
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"github.com/ethereum/go-ethereum/internal/ethapi"
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"github.com/ethereum/go-ethereum/light"
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"github.com/ethereum/go-ethereum/params"
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rpc "github.com/ethereum/go-ethereum/rpc"
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"golang.org/x/net/context"
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)
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type LesApiBackend struct {
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eth *LightEthereum
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gpo *gasprice.LightPriceOracle
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}
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func (b *LesApiBackend) ChainConfig() *params.ChainConfig {
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return b.eth.chainConfig
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}
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func (b *LesApiBackend) CurrentBlock() *types.Block {
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return types.NewBlockWithHeader(b.eth.BlockChain().CurrentHeader())
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}
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func (b *LesApiBackend) SetHead(number uint64) {
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b.eth.blockchain.SetHead(number)
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}
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func (b *LesApiBackend) HeaderByNumber(ctx context.Context, blockNr rpc.BlockNumber) (*types.Header, error) {
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if blockNr == rpc.LatestBlockNumber || blockNr == rpc.PendingBlockNumber {
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return b.eth.blockchain.CurrentHeader(), nil
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}
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return b.eth.blockchain.GetHeaderByNumberOdr(ctx, uint64(blockNr))
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}
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func (b *LesApiBackend) BlockByNumber(ctx context.Context, blockNr rpc.BlockNumber) (*types.Block, error) {
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header, err := b.HeaderByNumber(ctx, blockNr)
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if header == nil || err != nil {
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return nil, err
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}
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return b.GetBlock(ctx, header.Hash())
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}
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func (b *LesApiBackend) StateAndHeaderByNumber(ctx context.Context, blockNr rpc.BlockNumber) (ethapi.State, *types.Header, error) {
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header, err := b.HeaderByNumber(ctx, blockNr)
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if header == nil || err != nil {
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return nil, nil, err
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}
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return light.NewLightState(light.StateTrieID(header), b.eth.odr), header, nil
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}
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func (b *LesApiBackend) GetBlock(ctx context.Context, blockHash common.Hash) (*types.Block, error) {
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return b.eth.blockchain.GetBlockByHash(ctx, blockHash)
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}
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func (b *LesApiBackend) GetReceipts(ctx context.Context, blockHash common.Hash) (types.Receipts, error) {
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return light.GetBlockReceipts(ctx, b.eth.odr, blockHash, core.GetBlockNumber(b.eth.chainDb, blockHash))
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}
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func (b *LesApiBackend) GetTd(blockHash common.Hash) *big.Int {
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return b.eth.blockchain.GetTdByHash(blockHash)
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}
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func (b *LesApiBackend) GetVMEnv(ctx context.Context, msg core.Message, state ethapi.State, header *types.Header) (*vm.EVM, func() error, error) {
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stateDb := state.(*light.LightState).Copy()
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addr := msg.From()
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from, err := stateDb.GetOrNewStateObject(ctx, addr)
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if err != nil {
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return nil, nil, err
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}
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from.SetBalance(common.MaxBig)
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vmstate := light.NewVMState(ctx, stateDb)
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context := core.NewEVMContext(msg, header, b.eth.blockchain)
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return vm.NewEVM(context, vmstate, b.eth.chainConfig, vm.Config{}), vmstate.Error, nil
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}
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func (b *LesApiBackend) SendTx(ctx context.Context, signedTx *types.Transaction) error {
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return b.eth.txPool.Add(ctx, signedTx)
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}
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func (b *LesApiBackend) RemoveTx(txHash common.Hash) {
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b.eth.txPool.RemoveTx(txHash)
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}
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func (b *LesApiBackend) GetPoolTransactions() (types.Transactions, error) {
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return b.eth.txPool.GetTransactions()
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}
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func (b *LesApiBackend) GetPoolTransaction(txHash common.Hash) *types.Transaction {
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return b.eth.txPool.GetTransaction(txHash)
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}
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func (b *LesApiBackend) GetPoolNonce(ctx context.Context, addr common.Address) (uint64, error) {
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return b.eth.txPool.GetNonce(ctx, addr)
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}
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func (b *LesApiBackend) Stats() (pending int, queued int) {
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return b.eth.txPool.Stats(), 0
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}
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func (b *LesApiBackend) TxPoolContent() (map[common.Address]types.Transactions, map[common.Address]types.Transactions) {
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return b.eth.txPool.Content()
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}
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func (b *LesApiBackend) Downloader() *downloader.Downloader {
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return b.eth.Downloader()
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}
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func (b *LesApiBackend) ProtocolVersion() int {
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return b.eth.LesVersion() + 10000
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}
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func (b *LesApiBackend) SuggestPrice(ctx context.Context) (*big.Int, error) {
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return b.gpo.SuggestPrice(ctx)
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}
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func (b *LesApiBackend) ChainDb() ethdb.Database {
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return b.eth.chainDb
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}
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func (b *LesApiBackend) EventMux() *event.TypeMux {
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return b.eth.eventMux
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}
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func (b *LesApiBackend) AccountManager() *accounts.Manager {
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return b.eth.accountManager
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}
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