go-pulse/les/api_backend.go
bas-vk 4e36b1e3da core: bugfix state change race condition in txpool (#3412)
The transaction pool keeps track of the current nonce in its local pendingState. When a
new block comes in the pendingState is reset. During the reset it fetches multiple times
the current state through the use of the currentState callback. When a second block comes
in during the reset its possible that the state changes during the reset. If that block
holds transactions that are currently in the pool the local pendingState that is used to
determine nonces can get out of sync.
2016-12-10 23:54:58 +01:00

156 lines
5.0 KiB
Go

// Copyright 2016 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 (
"math/big"
"github.com/ethereum/go-ethereum/accounts"
"github.com/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/core"
"github.com/ethereum/go-ethereum/core/types"
"github.com/ethereum/go-ethereum/core/vm"
"github.com/ethereum/go-ethereum/eth/downloader"
"github.com/ethereum/go-ethereum/eth/gasprice"
"github.com/ethereum/go-ethereum/ethdb"
"github.com/ethereum/go-ethereum/event"
"github.com/ethereum/go-ethereum/internal/ethapi"
"github.com/ethereum/go-ethereum/light"
"github.com/ethereum/go-ethereum/params"
rpc "github.com/ethereum/go-ethereum/rpc"
"golang.org/x/net/context"
)
type LesApiBackend struct {
eth *LightEthereum
gpo *gasprice.LightPriceOracle
}
func (b *LesApiBackend) ChainConfig() *params.ChainConfig {
return b.eth.chainConfig
}
func (b *LesApiBackend) CurrentBlock() *types.Block {
return types.NewBlockWithHeader(b.eth.BlockChain().CurrentHeader())
}
func (b *LesApiBackend) SetHead(number uint64) {
b.eth.blockchain.SetHead(number)
}
func (b *LesApiBackend) HeaderByNumber(ctx context.Context, blockNr rpc.BlockNumber) (*types.Header, error) {
if blockNr == rpc.LatestBlockNumber || blockNr == rpc.PendingBlockNumber {
return b.eth.blockchain.CurrentHeader(), nil
}
return b.eth.blockchain.GetHeaderByNumberOdr(ctx, uint64(blockNr))
}
func (b *LesApiBackend) BlockByNumber(ctx context.Context, blockNr rpc.BlockNumber) (*types.Block, error) {
header, err := b.HeaderByNumber(ctx, blockNr)
if header == nil || err != nil {
return nil, err
}
return b.GetBlock(ctx, header.Hash())
}
func (b *LesApiBackend) StateAndHeaderByNumber(ctx context.Context, blockNr rpc.BlockNumber) (ethapi.State, *types.Header, error) {
header, err := b.HeaderByNumber(ctx, blockNr)
if header == nil || err != nil {
return nil, nil, err
}
return light.NewLightState(light.StateTrieID(header), b.eth.odr), header, nil
}
func (b *LesApiBackend) GetBlock(ctx context.Context, blockHash common.Hash) (*types.Block, error) {
return b.eth.blockchain.GetBlockByHash(ctx, blockHash)
}
func (b *LesApiBackend) GetReceipts(ctx context.Context, blockHash common.Hash) (types.Receipts, error) {
return light.GetBlockReceipts(ctx, b.eth.odr, blockHash, core.GetBlockNumber(b.eth.chainDb, blockHash))
}
func (b *LesApiBackend) GetTd(blockHash common.Hash) *big.Int {
return b.eth.blockchain.GetTdByHash(blockHash)
}
func (b *LesApiBackend) GetVMEnv(ctx context.Context, msg core.Message, state ethapi.State, header *types.Header) (*vm.Environment, func() error, error) {
stateDb := state.(*light.LightState).Copy()
addr := msg.From()
from, err := stateDb.GetOrNewStateObject(ctx, addr)
if err != nil {
return nil, nil, err
}
from.SetBalance(common.MaxBig)
vmstate := light.NewVMState(ctx, stateDb)
context := core.NewEVMContext(msg, header, b.eth.blockchain)
return vm.NewEnvironment(context, vmstate, b.eth.chainConfig, vm.Config{}), vmstate.Error, nil
}
func (b *LesApiBackend) SendTx(ctx context.Context, signedTx *types.Transaction) error {
return b.eth.txPool.Add(ctx, signedTx)
}
func (b *LesApiBackend) RemoveTx(txHash common.Hash) {
b.eth.txPool.RemoveTx(txHash)
}
func (b *LesApiBackend) GetPoolTransactions() (types.Transactions, error) {
return b.eth.txPool.GetTransactions()
}
func (b *LesApiBackend) GetPoolTransaction(txHash common.Hash) *types.Transaction {
return b.eth.txPool.GetTransaction(txHash)
}
func (b *LesApiBackend) GetPoolNonce(ctx context.Context, addr common.Address) (uint64, error) {
return b.eth.txPool.GetNonce(ctx, addr)
}
func (b *LesApiBackend) Stats() (pending int, queued int) {
return b.eth.txPool.Stats(), 0
}
func (b *LesApiBackend) TxPoolContent() (map[common.Address]types.Transactions, map[common.Address]types.Transactions) {
return b.eth.txPool.Content()
}
func (b *LesApiBackend) Downloader() *downloader.Downloader {
return b.eth.Downloader()
}
func (b *LesApiBackend) ProtocolVersion() int {
return b.eth.LesVersion() + 10000
}
func (b *LesApiBackend) SuggestPrice(ctx context.Context) (*big.Int, error) {
return b.gpo.SuggestPrice(ctx)
}
func (b *LesApiBackend) ChainDb() ethdb.Database {
return b.eth.chainDb
}
func (b *LesApiBackend) EventMux() *event.TypeMux {
return b.eth.eventMux
}
func (b *LesApiBackend) AccountManager() *accounts.Manager {
return b.eth.accountManager
}