b4a2681120
This PR reimplements the light client server pool. It is also a first step to move certain logic into a new lespay package. This package will contain the implementation of the lespay token sale functions, the token buying and selling logic and other components related to peer selection/prioritization and service quality evaluation. Over the long term this package will be reusable for incentivizing future protocols. Since the LES peer logic is now based on enode.Iterator, it can now use DNS-based fallback discovery to find servers. This document describes the function of the new components: https://gist.github.com/zsfelfoldi/3c7ace895234b7b345ab4f71dab102d4
319 lines
11 KiB
Go
319 lines
11 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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"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/les/checkpointoracle"
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lpc "github.com/ethereum/go-ethereum/les/lespay/client"
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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/enode"
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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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peers *serverPeerSet
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reqDist *requestDistributor
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retriever *retrieveManager
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odr *LesOdr
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relay *lesTxRelay
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handler *clientHandler
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txPool *light.TxPool
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blockchain *light.LightChain
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serverPool *serverPool
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valueTracker *lpc.ValueTracker
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dialCandidates enode.Iterator
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bloomRequests chan chan *bloombits.Retrieval // Channel receiving bloom data retrieval requests
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bloomIndexer *core.ChainIndexer // Bloom indexer operating during block imports
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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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netRPCService *ethapi.PublicNetAPI
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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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lespayDb, err := ctx.OpenDatabase("lespay", 0, 0, "eth/db/lespay")
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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 := newServerPeerSet()
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leth := &LightEthereum{
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lesCommons: lesCommons{
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genesis: genesisHash,
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config: config,
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chainConfig: chainConfig,
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iConfig: light.DefaultClientIndexerConfig,
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chainDb: chainDb,
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closeCh: make(chan struct{}),
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},
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peers: peers,
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eventMux: ctx.EventMux,
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reqDist: newRequestDistributor(peers, &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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bloomRequests: make(chan chan *bloombits.Retrieval),
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bloomIndexer: eth.NewBloomIndexer(chainDb, params.BloomBitsBlocksClient, params.HelperTrieConfirmations),
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valueTracker: lpc.NewValueTracker(lespayDb, &mclock.System{}, requestList, time.Minute, 1/float64(time.Hour), 1/float64(time.Hour*100), 1/float64(time.Hour*1000)),
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}
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peers.subscribe((*vtSubscription)(leth.valueTracker))
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dnsdisc, err := leth.setupDiscovery(&ctx.Config.P2P)
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if err != nil {
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return nil, err
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}
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leth.serverPool = newServerPool(lespayDb, []byte("serverpool:"), leth.valueTracker, dnsdisc, time.Second, nil, &mclock.System{}, config.UltraLightServers)
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peers.subscribe(leth.serverPool)
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leth.dialCandidates = leth.serverPool.dialIterator
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leth.retriever = newRetrieveManager(peers, leth.reqDist, leth.serverPool.getTimeout)
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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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leth.chainReader = leth.blockchain
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leth.txPool = light.NewTxPool(leth.chainConfig, leth.blockchain, leth.relay)
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// Set up checkpoint oracle.
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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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leth.oracle = checkpointoracle.New(oracle, leth.localCheckpoint)
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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.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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leth.handler = newClientHandler(config.UltraLightServers, config.UltraLightFraction, checkpoint, leth)
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if leth.handler.ulc != nil {
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log.Warn("Ultra light client is enabled", "trustedNodes", len(leth.handler.ulc.keys), "minTrustedFraction", leth.handler.ulc.fraction)
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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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// vtSubscription implements serverPeerSubscriber
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type vtSubscription lpc.ValueTracker
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// registerPeer implements serverPeerSubscriber
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func (v *vtSubscription) registerPeer(p *serverPeer) {
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vt := (*lpc.ValueTracker)(v)
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p.setValueTracker(vt, vt.Register(p.ID()))
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p.updateVtParams()
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}
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// unregisterPeer implements serverPeerSubscriber
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func (v *vtSubscription) unregisterPeer(p *serverPeer) {
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vt := (*lpc.ValueTracker)(v)
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vt.Unregister(p.ID())
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p.setValueTracker(nil, nil)
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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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apis := ethapi.GetAPIs(s.ApiBackend)
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apis = append(apis, s.engine.APIs(s.BlockChain().HeaderChain())...)
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return append(apis, []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.handler.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),
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Public: false,
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}, {
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Namespace: "lespay",
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Version: "1.0",
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Service: lpc.NewPrivateClientAPI(s.valueTracker),
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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.handler.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, s.handler.runPeer, func(id enode.ID) interface{} {
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if p := s.peers.peer(peerIdToString(id)); p != nil {
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return p.Info()
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}
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return nil
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}, s.dialCandidates)
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}
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// Start implements node.Service, starting all internal goroutines needed by the
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// light 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.serverPool.start()
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// Start bloom request workers.
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s.wg.Add(bloomServiceThreads)
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s.startBloomHandlers(params.BloomBitsBlocksClient)
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s.netRPCService = ethapi.NewPublicNetAPI(srvr, s.config.NetworkId)
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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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close(s.closeCh)
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s.serverPool.stop()
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s.valueTracker.Stop()
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s.peers.close()
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s.reqDist.close()
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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.handler.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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s.chainDb.Close()
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s.wg.Wait()
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log.Info("Light ethereum stopped")
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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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if s.oracle == nil {
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return
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}
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s.oracle.Start(backend)
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}
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