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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
148 lines
5.4 KiB
Go
148 lines
5.4 KiB
Go
// Copyright 2018 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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"fmt"
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"math/big"
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"sync"
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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/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/ethdb"
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"github.com/ethereum/go-ethereum/les/checkpointoracle"
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"github.com/ethereum/go-ethereum/light"
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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/p2p/enode"
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"github.com/ethereum/go-ethereum/params"
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)
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func errResp(code errCode, format string, v ...interface{}) error {
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return fmt.Errorf("%v - %v", code, fmt.Sprintf(format, v...))
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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 chainReader interface {
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CurrentHeader() *types.Header
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}
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// lesCommons contains fields needed by both server and client.
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type lesCommons struct {
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genesis common.Hash
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config *eth.Config
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chainConfig *params.ChainConfig
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iConfig *light.IndexerConfig
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chainDb ethdb.Database
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chainReader chainReader
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chtIndexer, bloomTrieIndexer *core.ChainIndexer
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oracle *checkpointoracle.CheckpointOracle
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closeCh chan struct{}
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wg sync.WaitGroup
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}
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// NodeInfo represents a short summary of the Ethereum sub-protocol metadata
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// known about the host peer.
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type NodeInfo struct {
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Network uint64 `json:"network"` // Ethereum network ID (1=Frontier, 2=Morden, Ropsten=3, Rinkeby=4)
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Difficulty *big.Int `json:"difficulty"` // Total difficulty of the host's blockchain
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Genesis common.Hash `json:"genesis"` // SHA3 hash of the host's genesis block
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Config *params.ChainConfig `json:"config"` // Chain configuration for the fork rules
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Head common.Hash `json:"head"` // SHA3 hash of the host's best owned block
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CHT params.TrustedCheckpoint `json:"cht"` // Trused CHT checkpoint for fast catchup
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}
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// makeProtocols creates protocol descriptors for the given LES versions.
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func (c *lesCommons) makeProtocols(versions []uint, runPeer func(version uint, p *p2p.Peer, rw p2p.MsgReadWriter) error, peerInfo func(id enode.ID) interface{}, dialCandidates enode.Iterator) []p2p.Protocol {
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protos := make([]p2p.Protocol, len(versions))
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for i, version := range versions {
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version := version
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protos[i] = p2p.Protocol{
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Name: "les",
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Version: version,
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Length: ProtocolLengths[version],
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NodeInfo: c.nodeInfo,
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Run: func(peer *p2p.Peer, rw p2p.MsgReadWriter) error {
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return runPeer(version, peer, rw)
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},
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PeerInfo: peerInfo,
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DialCandidates: dialCandidates,
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}
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}
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return protos
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}
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// nodeInfo retrieves some protocol metadata about the running host node.
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func (c *lesCommons) nodeInfo() interface{} {
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head := c.chainReader.CurrentHeader()
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hash := head.Hash()
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return &NodeInfo{
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Network: c.config.NetworkId,
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Difficulty: rawdb.ReadTd(c.chainDb, hash, head.Number.Uint64()),
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Genesis: c.genesis,
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Config: c.chainConfig,
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Head: hash,
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CHT: c.latestLocalCheckpoint(),
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}
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}
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// latestLocalCheckpoint finds the common stored section index and returns a set
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// of post-processed trie roots (CHT and BloomTrie) associated with the appropriate
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// section index and head hash as a local checkpoint package.
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func (c *lesCommons) latestLocalCheckpoint() params.TrustedCheckpoint {
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sections, _, _ := c.chtIndexer.Sections()
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sections2, _, _ := c.bloomTrieIndexer.Sections()
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// Cap the section index if the two sections are not consistent.
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if sections > sections2 {
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sections = sections2
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}
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if sections == 0 {
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// No checkpoint information can be provided.
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return params.TrustedCheckpoint{}
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}
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return c.localCheckpoint(sections - 1)
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}
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// localCheckpoint returns a set of post-processed trie roots (CHT and BloomTrie)
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// associated with the appropriate head hash by specific section index.
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//
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// The returned checkpoint is only the checkpoint generated by the local indexers,
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// not the stable checkpoint registered in the registrar contract.
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func (c *lesCommons) localCheckpoint(index uint64) params.TrustedCheckpoint {
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sectionHead := c.chtIndexer.SectionHead(index)
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return params.TrustedCheckpoint{
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SectionIndex: index,
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SectionHead: sectionHead,
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CHTRoot: light.GetChtRoot(c.chainDb, index, sectionHead),
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BloomRoot: light.GetBloomTrieRoot(c.chainDb, index, sectionHead),
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}
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}
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