292 lines
10 KiB
Go
292 lines
10 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 implements the Light Ethereum Subprotocol.
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package les
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import (
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"fmt"
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"sync"
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"time"
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"github.com/ethereum/go-ethereum/accounts"
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"github.com/ethereum/go-ethereum/accounts/abi/bind"
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"github.com/ethereum/go-ethereum/common"
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"github.com/ethereum/go-ethereum/common/hexutil"
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"github.com/ethereum/go-ethereum/common/mclock"
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"github.com/ethereum/go-ethereum/consensus"
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"github.com/ethereum/go-ethereum/core"
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"github.com/ethereum/go-ethereum/core/bloombits"
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"github.com/ethereum/go-ethereum/core/rawdb"
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"github.com/ethereum/go-ethereum/core/types"
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"github.com/ethereum/go-ethereum/eth"
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"github.com/ethereum/go-ethereum/eth/downloader"
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"github.com/ethereum/go-ethereum/eth/filters"
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"github.com/ethereum/go-ethereum/eth/gasprice"
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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/log"
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"github.com/ethereum/go-ethereum/node"
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"github.com/ethereum/go-ethereum/p2p"
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"github.com/ethereum/go-ethereum/p2p/discv5"
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"github.com/ethereum/go-ethereum/params"
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"github.com/ethereum/go-ethereum/rpc"
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)
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type LightEthereum struct {
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lesCommons
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odr *LesOdr
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chainConfig *params.ChainConfig
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// Channel for shutting down the service
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shutdownChan chan bool
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// Handlers
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peers *peerSet
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txPool *light.TxPool
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blockchain *light.LightChain
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serverPool *serverPool
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reqDist *requestDistributor
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retriever *retrieveManager
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relay *lesTxRelay
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bloomRequests chan chan *bloombits.Retrieval // Channel receiving bloom data retrieval requests
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bloomIndexer *core.ChainIndexer
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ApiBackend *LesApiBackend
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eventMux *event.TypeMux
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engine consensus.Engine
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accountManager *accounts.Manager
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networkId uint64
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netRPCService *ethapi.PublicNetAPI
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wg sync.WaitGroup
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}
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func New(ctx *node.ServiceContext, config *eth.Config) (*LightEthereum, error) {
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chainDb, err := ctx.OpenDatabase("lightchaindata", config.DatabaseCache, config.DatabaseHandles, "eth/db/chaindata/")
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if err != nil {
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return nil, err
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}
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chainConfig, genesisHash, genesisErr := core.SetupGenesisBlock(chainDb, config.Genesis)
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if _, isCompat := genesisErr.(*params.ConfigCompatError); genesisErr != nil && !isCompat {
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return nil, genesisErr
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}
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log.Info("Initialised chain configuration", "config", chainConfig)
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peers := newPeerSet()
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quitSync := make(chan struct{})
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leth := &LightEthereum{
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lesCommons: lesCommons{
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chainDb: chainDb,
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config: config,
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iConfig: light.DefaultClientIndexerConfig,
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},
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chainConfig: chainConfig,
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eventMux: ctx.EventMux,
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peers: peers,
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reqDist: newRequestDistributor(peers, quitSync, &mclock.System{}),
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accountManager: ctx.AccountManager,
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engine: eth.CreateConsensusEngine(ctx, chainConfig, &config.Ethash, nil, false, chainDb),
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shutdownChan: make(chan bool),
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networkId: config.NetworkId,
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bloomRequests: make(chan chan *bloombits.Retrieval),
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bloomIndexer: eth.NewBloomIndexer(chainDb, params.BloomBitsBlocksClient, params.HelperTrieConfirmations),
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}
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leth.serverPool = newServerPool(chainDb, quitSync, &leth.wg, leth.config.UltraLightServers)
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leth.retriever = newRetrieveManager(peers, leth.reqDist, leth.serverPool)
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leth.relay = newLesTxRelay(peers, leth.retriever)
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leth.odr = NewLesOdr(chainDb, light.DefaultClientIndexerConfig, leth.retriever)
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leth.chtIndexer = light.NewChtIndexer(chainDb, leth.odr, params.CHTFrequency, params.HelperTrieConfirmations)
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leth.bloomTrieIndexer = light.NewBloomTrieIndexer(chainDb, leth.odr, params.BloomBitsBlocksClient, params.BloomTrieFrequency)
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leth.odr.SetIndexers(leth.chtIndexer, leth.bloomTrieIndexer, leth.bloomIndexer)
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checkpoint := config.Checkpoint
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if checkpoint == nil {
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checkpoint = params.TrustedCheckpoints[genesisHash]
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}
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// Note: NewLightChain adds the trusted checkpoint so it needs an ODR with
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// indexers already set but not started yet
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if leth.blockchain, err = light.NewLightChain(leth.odr, leth.chainConfig, leth.engine, checkpoint); err != nil {
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return nil, err
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}
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// Note: AddChildIndexer starts the update process for the child
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leth.bloomIndexer.AddChildIndexer(leth.bloomTrieIndexer)
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leth.chtIndexer.Start(leth.blockchain)
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leth.bloomIndexer.Start(leth.blockchain)
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// Rewind the chain in case of an incompatible config upgrade.
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if compat, ok := genesisErr.(*params.ConfigCompatError); ok {
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log.Warn("Rewinding chain to upgrade configuration", "err", compat)
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leth.blockchain.SetHead(compat.RewindTo)
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rawdb.WriteChainConfig(chainDb, genesisHash, chainConfig)
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}
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leth.txPool = light.NewTxPool(leth.chainConfig, leth.blockchain, leth.relay)
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leth.ApiBackend = &LesApiBackend{ctx.ExtRPCEnabled(), leth, nil}
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gpoParams := config.GPO
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if gpoParams.Default == nil {
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gpoParams.Default = config.Miner.GasPrice
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}
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leth.ApiBackend.gpo = gasprice.NewOracle(leth.ApiBackend, gpoParams)
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oracle := config.CheckpointOracle
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if oracle == nil {
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oracle = params.CheckpointOracles[genesisHash]
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}
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registrar := newCheckpointOracle(oracle, leth.getLocalCheckpoint)
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if leth.protocolManager, err = NewProtocolManager(leth.chainConfig, checkpoint, light.DefaultClientIndexerConfig, config.UltraLightServers, config.UltraLightFraction, true, config.NetworkId, leth.eventMux, leth.peers, leth.blockchain, nil, chainDb, leth.odr, leth.serverPool, registrar, quitSync, &leth.wg, nil); err != nil {
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return nil, err
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}
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if leth.protocolManager.ulc != nil {
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log.Warn("Ultra light client is enabled", "servers", len(config.UltraLightServers), "fraction", config.UltraLightFraction)
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leth.blockchain.DisableCheckFreq()
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}
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return leth, nil
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}
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func lesTopic(genesisHash common.Hash, protocolVersion uint) discv5.Topic {
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var name string
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switch protocolVersion {
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case lpv2:
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name = "LES2"
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default:
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panic(nil)
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}
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return discv5.Topic(name + "@" + common.Bytes2Hex(genesisHash.Bytes()[0:8]))
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}
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type LightDummyAPI struct{}
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// Etherbase is the address that mining rewards will be send to
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func (s *LightDummyAPI) Etherbase() (common.Address, error) {
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return common.Address{}, fmt.Errorf("mining is not supported in light mode")
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}
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// Coinbase is the address that mining rewards will be send to (alias for Etherbase)
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func (s *LightDummyAPI) Coinbase() (common.Address, error) {
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return common.Address{}, fmt.Errorf("mining is not supported in light mode")
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}
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// Hashrate returns the POW hashrate
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func (s *LightDummyAPI) Hashrate() hexutil.Uint {
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return 0
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}
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// Mining returns an indication if this node is currently mining.
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func (s *LightDummyAPI) Mining() bool {
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return false
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}
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// APIs returns the collection of RPC services the ethereum package offers.
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// NOTE, some of these services probably need to be moved to somewhere else.
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func (s *LightEthereum) APIs() []rpc.API {
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return append(ethapi.GetAPIs(s.ApiBackend), []rpc.API{
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{
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Namespace: "eth",
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Version: "1.0",
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Service: &LightDummyAPI{},
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Public: true,
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}, {
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Namespace: "eth",
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Version: "1.0",
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Service: downloader.NewPublicDownloaderAPI(s.protocolManager.downloader, s.eventMux),
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Public: true,
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}, {
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Namespace: "eth",
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Version: "1.0",
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Service: filters.NewPublicFilterAPI(s.ApiBackend, true),
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Public: true,
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}, {
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Namespace: "net",
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Version: "1.0",
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Service: s.netRPCService,
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Public: true,
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}, {
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Namespace: "les",
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Version: "1.0",
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Service: NewPrivateLightAPI(&s.lesCommons, s.protocolManager.reg),
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Public: false,
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},
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}...)
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}
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func (s *LightEthereum) ResetWithGenesisBlock(gb *types.Block) {
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s.blockchain.ResetWithGenesisBlock(gb)
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}
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func (s *LightEthereum) BlockChain() *light.LightChain { return s.blockchain }
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func (s *LightEthereum) TxPool() *light.TxPool { return s.txPool }
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func (s *LightEthereum) Engine() consensus.Engine { return s.engine }
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func (s *LightEthereum) LesVersion() int { return int(ClientProtocolVersions[0]) }
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func (s *LightEthereum) Downloader() *downloader.Downloader { return s.protocolManager.downloader }
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func (s *LightEthereum) EventMux() *event.TypeMux { return s.eventMux }
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// Protocols implements node.Service, returning all the currently configured
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// network protocols to start.
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func (s *LightEthereum) Protocols() []p2p.Protocol {
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return s.makeProtocols(ClientProtocolVersions)
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}
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// Start implements node.Service, starting all internal goroutines needed by the
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// Ethereum protocol implementation.
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func (s *LightEthereum) Start(srvr *p2p.Server) error {
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log.Warn("Light client mode is an experimental feature")
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s.startBloomHandlers(params.BloomBitsBlocksClient)
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s.netRPCService = ethapi.NewPublicNetAPI(srvr, s.networkId)
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// clients are searching for the first advertised protocol in the list
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protocolVersion := AdvertiseProtocolVersions[0]
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s.serverPool.start(srvr, lesTopic(s.blockchain.Genesis().Hash(), protocolVersion))
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s.protocolManager.Start(s.config.LightPeers)
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return nil
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}
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// Stop implements node.Service, terminating all internal goroutines used by the
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// Ethereum protocol.
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func (s *LightEthereum) Stop() error {
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s.odr.Stop()
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s.relay.Stop()
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s.bloomIndexer.Close()
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s.chtIndexer.Close()
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s.blockchain.Stop()
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s.protocolManager.Stop()
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s.txPool.Stop()
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s.engine.Close()
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s.eventMux.Stop()
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time.Sleep(time.Millisecond * 200)
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s.chainDb.Close()
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close(s.shutdownChan)
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return nil
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}
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// SetClient sets the rpc client and binds the registrar contract.
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func (s *LightEthereum) SetContractBackend(backend bind.ContractBackend) {
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// Short circuit if registrar is nil
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if s.protocolManager.reg == nil {
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return
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}
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s.protocolManager.reg.start(backend)
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}
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