// 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 implements the Light Ethereum Subprotocol.
package les
import (
"fmt"
"github.com/ethereum/go-ethereum/accounts"
"github.com/ethereum/go-ethereum/accounts/abi/bind"
"github.com/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/common/hexutil"
"github.com/ethereum/go-ethereum/common/mclock"
"github.com/ethereum/go-ethereum/consensus"
"github.com/ethereum/go-ethereum/core"
"github.com/ethereum/go-ethereum/core/bloombits"
"github.com/ethereum/go-ethereum/core/rawdb"
"github.com/ethereum/go-ethereum/core/types"
"github.com/ethereum/go-ethereum/eth"
"github.com/ethereum/go-ethereum/eth/downloader"
"github.com/ethereum/go-ethereum/eth/filters"
"github.com/ethereum/go-ethereum/eth/gasprice"
"github.com/ethereum/go-ethereum/event"
"github.com/ethereum/go-ethereum/internal/ethapi"
"github.com/ethereum/go-ethereum/light"
"github.com/ethereum/go-ethereum/log"
"github.com/ethereum/go-ethereum/node"
"github.com/ethereum/go-ethereum/p2p"
"github.com/ethereum/go-ethereum/p2p/enode"
"github.com/ethereum/go-ethereum/params"
"github.com/ethereum/go-ethereum/rpc"
)
type LightEthereum struct {
lesCommons
reqDist *requestDistributor
retriever *retrieveManager
odr *LesOdr
relay *lesTxRelay
handler *clientHandler
txPool *light.TxPool
blockchain *light.LightChain
serverPool *serverPool
bloomRequests chan chan *bloombits.Retrieval // Channel receiving bloom data retrieval requests
bloomIndexer *core.ChainIndexer // Bloom indexer operating during block imports
ApiBackend *LesApiBackend
eventMux *event.TypeMux
engine consensus.Engine
accountManager *accounts.Manager
netRPCService *ethapi.PublicNetAPI
}
func New(ctx *node.ServiceContext, config *eth.Config) (*LightEthereum, error) {
chainDb, err := ctx.OpenDatabase("lightchaindata", config.DatabaseCache, config.DatabaseHandles, "eth/db/chaindata/")
if err != nil {
return nil, err
}
chainConfig, genesisHash, genesisErr := core.SetupGenesisBlockWithOverride(chainDb, config.Genesis, config.OverrideIstanbul)
if _, isCompat := genesisErr.(*params.ConfigCompatError); genesisErr != nil && !isCompat {
return nil, genesisErr
}
log.Info("Initialised chain configuration", "config", chainConfig)
peers := newPeerSet()
leth := &LightEthereum{
lesCommons: lesCommons{
genesis: genesisHash,
config: config,
chainConfig: chainConfig,
iConfig: light.DefaultClientIndexerConfig,
chainDb: chainDb,
peers: peers,
closeCh: make(chan struct{}),
},
eventMux: ctx.EventMux,
reqDist: newRequestDistributor(peers, &mclock.System{}),
accountManager: ctx.AccountManager,
engine: eth.CreateConsensusEngine(ctx, chainConfig, &config.Ethash, nil, false, chainDb),
bloomRequests: make(chan chan *bloombits.Retrieval),
bloomIndexer: eth.NewBloomIndexer(chainDb, params.BloomBitsBlocksClient, params.HelperTrieConfirmations),
serverPool: newServerPool(chainDb, config.UltraLightServers),
}
leth.retriever = newRetrieveManager(peers, leth.reqDist, leth.serverPool)
leth.relay = newLesTxRelay(peers, leth.retriever)
leth.odr = NewLesOdr(chainDb, light.DefaultClientIndexerConfig, leth.retriever)
leth.chtIndexer = light.NewChtIndexer(chainDb, leth.odr, params.CHTFrequency, params.HelperTrieConfirmations)
leth.bloomTrieIndexer = light.NewBloomTrieIndexer(chainDb, leth.odr, params.BloomBitsBlocksClient, params.BloomTrieFrequency)
leth.odr.SetIndexers(leth.chtIndexer, leth.bloomTrieIndexer, leth.bloomIndexer)
checkpoint := config.Checkpoint
if checkpoint == nil {
checkpoint = params.TrustedCheckpoints[genesisHash]
}
// Note: NewLightChain adds the trusted checkpoint so it needs an ODR with
// indexers already set but not started yet
if leth.blockchain, err = light.NewLightChain(leth.odr, leth.chainConfig, leth.engine, checkpoint); err != nil {
return nil, err
}
leth.chainReader = leth.blockchain
leth.txPool = light.NewTxPool(leth.chainConfig, leth.blockchain, leth.relay)
// Set up checkpoint oracle.
oracle := config.CheckpointOracle
if oracle == nil {
oracle = params.CheckpointOracles[genesisHash]
}
leth.oracle = newCheckpointOracle(oracle, leth.localCheckpoint)
// Note: AddChildIndexer starts the update process for the child
leth.bloomIndexer.AddChildIndexer(leth.bloomTrieIndexer)
leth.chtIndexer.Start(leth.blockchain)
leth.bloomIndexer.Start(leth.blockchain)
leth.handler = newClientHandler(config.UltraLightServers, config.UltraLightFraction, checkpoint, leth)
if leth.handler.ulc != nil {
log.Warn("Ultra light client is enabled", "trustedNodes", len(leth.handler.ulc.keys), "minTrustedFraction", leth.handler.ulc.fraction)
leth.blockchain.DisableCheckFreq()
}
// Rewind the chain in case of an incompatible config upgrade.
if compat, ok := genesisErr.(*params.ConfigCompatError); ok {
log.Warn("Rewinding chain to upgrade configuration", "err", compat)
leth.blockchain.SetHead(compat.RewindTo)
rawdb.WriteChainConfig(chainDb, genesisHash, chainConfig)
}
leth.ApiBackend = &LesApiBackend{ctx.ExtRPCEnabled(), leth, nil}
gpoParams := config.GPO
if gpoParams.Default == nil {
gpoParams.Default = config.Miner.GasPrice
}
leth.ApiBackend.gpo = gasprice.NewOracle(leth.ApiBackend, gpoParams)
return leth, nil
}
type LightDummyAPI struct{}
// Etherbase is the address that mining rewards will be send to
func (s *LightDummyAPI) Etherbase() (common.Address, error) {
return common.Address{}, fmt.Errorf("mining is not supported in light mode")
}
// Coinbase is the address that mining rewards will be send to (alias for Etherbase)
func (s *LightDummyAPI) Coinbase() (common.Address, error) {
return common.Address{}, fmt.Errorf("mining is not supported in light mode")
}
// Hashrate returns the POW hashrate
func (s *LightDummyAPI) Hashrate() hexutil.Uint {
return 0
}
// Mining returns an indication if this node is currently mining.
func (s *LightDummyAPI) Mining() bool {
return false
}
// APIs returns the collection of RPC services the ethereum package offers.
// NOTE, some of these services probably need to be moved to somewhere else.
func (s *LightEthereum) APIs() []rpc.API {
return append(ethapi.GetAPIs(s.ApiBackend), []rpc.API{
{
Namespace: "eth",
Version: "1.0",
Service: &LightDummyAPI{},
Public: true,
}, {
Namespace: "eth",
Version: "1.0",
Service: downloader.NewPublicDownloaderAPI(s.handler.downloader, s.eventMux),
Public: true,
}, {
Namespace: "eth",
Version: "1.0",
Service: filters.NewPublicFilterAPI(s.ApiBackend, true),
Public: true,
}, {
Namespace: "net",
Version: "1.0",
Service: s.netRPCService,
Public: true,
}, {
Namespace: "les",
Version: "1.0",
Service: NewPrivateLightAPI(&s.lesCommons),
Public: false,
},
}...)
}
func (s *LightEthereum) ResetWithGenesisBlock(gb *types.Block) {
s.blockchain.ResetWithGenesisBlock(gb)
}
func (s *LightEthereum) BlockChain() *light.LightChain { return s.blockchain }
func (s *LightEthereum) TxPool() *light.TxPool { return s.txPool }
func (s *LightEthereum) Engine() consensus.Engine { return s.engine }
func (s *LightEthereum) LesVersion() int { return int(ClientProtocolVersions[0]) }
func (s *LightEthereum) Downloader() *downloader.Downloader { return s.handler.downloader }
func (s *LightEthereum) EventMux() *event.TypeMux { return s.eventMux }
// Protocols implements node.Service, returning all the currently configured
// network protocols to start.
func (s *LightEthereum) Protocols() []p2p.Protocol {
return s.makeProtocols(ClientProtocolVersions, s.handler.runPeer, func(id enode.ID) interface{} {
if p := s.peers.Peer(peerIdToString(id)); p != nil {
return p.Info()
}
return nil
})
}
// Start implements node.Service, starting all internal goroutines needed by the
// light ethereum protocol implementation.
func (s *LightEthereum) Start(srvr *p2p.Server) error {
log.Warn("Light client mode is an experimental feature")
// Start bloom request workers.
s.wg.Add(bloomServiceThreads)
s.startBloomHandlers(params.BloomBitsBlocksClient)
s.netRPCService = ethapi.NewPublicNetAPI(srvr, s.config.NetworkId)
// clients are searching for the first advertised protocol in the list
protocolVersion := AdvertiseProtocolVersions[0]
s.serverPool.start(srvr, lesTopic(s.blockchain.Genesis().Hash(), protocolVersion))
return nil
}
// Stop implements node.Service, terminating all internal goroutines used by the
// Ethereum protocol.
func (s *LightEthereum) Stop() error {
close(s.closeCh)
s.peers.Close()
s.reqDist.close()
s.odr.Stop()
s.relay.Stop()
s.bloomIndexer.Close()
s.chtIndexer.Close()
s.blockchain.Stop()
s.handler.stop()
s.txPool.Stop()
s.engine.Close()
s.eventMux.Stop()
s.serverPool.stop()
s.chainDb.Close()
s.wg.Wait()
log.Info("Light ethereum stopped")
return nil
}
// SetClient sets the rpc client and binds the registrar contract.
func (s *LightEthereum) SetContractBackend(backend bind.ContractBackend) {
if s.oracle == nil {
return
}
s.oracle.start(backend)
}
