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handler.go
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handler.go
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//此源码被清华学神尹成大魔王专业翻译分析并修改
//尹成QQ77025077
//尹成微信18510341407
//尹成所在QQ群721929980
//尹成邮箱 yinc13@mails.tsinghua.edu.cn
//尹成毕业于清华大学,微软区块链领域全球最有价值专家
//https://mvp.microsoft.com/zh-cn/PublicProfile/4033620
//版权所有2016 Go Ethereum作者
//此文件是Go以太坊库的一部分。
//
//Go-Ethereum库是免费软件:您可以重新分发它和/或修改
//根据GNU发布的较低通用公共许可证的条款
//自由软件基金会,或者许可证的第3版,或者
//(由您选择)任何更高版本。
//
//Go以太坊图书馆的发行目的是希望它会有用,
//但没有任何保证;甚至没有
//适销性或特定用途的适用性。见
//GNU较低的通用公共许可证,了解更多详细信息。
//
//你应该收到一份GNU较低级别的公共许可证副本
//以及Go以太坊图书馆。如果没有,请参见<http://www.gnu.org/licenses/>。
//包les实现轻以太坊子协议。
package les
import (
"encoding/binary"
"encoding/json"
"fmt"
"math/big"
"net"
"sync"
"time"
"github.com/ethereum/go-ethereum/common"
"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/rawdb"
"github.com/ethereum/go-ethereum/core/state"
"github.com/ethereum/go-ethereum/core/types"
"github.com/ethereum/go-ethereum/eth/downloader"
"github.com/ethereum/go-ethereum/ethdb"
"github.com/ethereum/go-ethereum/event"
"github.com/ethereum/go-ethereum/light"
"github.com/ethereum/go-ethereum/log"
"github.com/ethereum/go-ethereum/p2p"
"github.com/ethereum/go-ethereum/p2p/discv5"
"github.com/ethereum/go-ethereum/params"
"github.com/ethereum/go-ethereum/rlp"
"github.com/ethereum/go-ethereum/trie"
)
const (
softResponseLimit = 2 * 1024 * 1024 //返回的块、头或节点数据的目标最大大小。
estHeaderRlpSize = 500 //RLP编码块头的近似大小
ethVersion = 63 //下载器的等效ETH版本
MaxHeaderFetch = 192 //每个检索请求要获取的块头的数量
MaxBodyFetch = 32 //每个检索请求要获取的块体数量
MaxReceiptFetch = 128 //允许每个请求提取的事务处理收据的数量
MaxCodeFetch = 64 //允许按请求提取的合同代码量
MaxProofsFetch = 64 //每个检索请求要获取的Merkle证明的数量
MaxHelperTrieProofsFetch = 64 //每个检索请求要获取的Merkle证明的数量
MaxTxSend = 64 //每个请求发送的事务量
MaxTxStatus = 256 //每个请求要查询的事务量
disableClientRemovePeer = false
)
func errResp(code errCode, format string, v ...interface{}) error {
return fmt.Errorf("%v - %v", code, fmt.Sprintf(format, v...))
}
type BlockChain interface {
Config() *params.ChainConfig
HasHeader(hash common.Hash, number uint64) bool
GetHeader(hash common.Hash, number uint64) *types.Header
GetHeaderByHash(hash common.Hash) *types.Header
CurrentHeader() *types.Header
GetTd(hash common.Hash, number uint64) *big.Int
State() (*state.StateDB, error)
InsertHeaderChain(chain []*types.Header, checkFreq int) (int, error)
Rollback(chain []common.Hash)
GetHeaderByNumber(number uint64) *types.Header
GetAncestor(hash common.Hash, number, ancestor uint64, maxNonCanonical *uint64) (common.Hash, uint64)
Genesis() *types.Block
SubscribeChainHeadEvent(ch chan<- core.ChainHeadEvent) event.Subscription
}
type txPool interface {
AddRemotes(txs []*types.Transaction) []error
Status(hashes []common.Hash) []core.TxStatus
}
type ProtocolManager struct {
lightSync bool
txpool txPool
txrelay *LesTxRelay
networkId uint64
chainConfig *params.ChainConfig
iConfig *light.IndexerConfig
blockchain BlockChain
chainDb ethdb.Database
odr *LesOdr
server *LesServer
serverPool *serverPool
clientPool *freeClientPool
lesTopic discv5.Topic
reqDist *requestDistributor
retriever *retrieveManager
downloader *downloader.Downloader
fetcher *lightFetcher
peers *peerSet
maxPeers int
eventMux *event.TypeMux
//获取器、同步器、TxSyncLoop的通道
newPeerCh chan *peer
quitSync chan struct{}
noMorePeers chan struct{}
//等待组用于在下载过程中正常关闭
//加工
wg *sync.WaitGroup
}
//NewProtocolManager返回新的以太坊子协议管理器。以太坊子协议管理对等端
//使用以太坊网络。
func NewProtocolManager(chainConfig *params.ChainConfig, indexerConfig *light.IndexerConfig, lightSync bool, networkId uint64, mux *event.TypeMux, engine consensus.Engine, peers *peerSet, blockchain BlockChain, txpool txPool, chainDb ethdb.Database, odr *LesOdr, txrelay *LesTxRelay, serverPool *serverPool, quitSync chan struct{}, wg *sync.WaitGroup) (*ProtocolManager, error) {
//使用基本字段创建协议管理器
manager := &ProtocolManager{
lightSync: lightSync,
eventMux: mux,
blockchain: blockchain,
chainConfig: chainConfig,
iConfig: indexerConfig,
chainDb: chainDb,
odr: odr,
networkId: networkId,
txpool: txpool,
txrelay: txrelay,
serverPool: serverPool,
peers: peers,
newPeerCh: make(chan *peer),
quitSync: quitSync,
wg: wg,
noMorePeers: make(chan struct{}),
}
if odr != nil {
manager.retriever = odr.retriever
manager.reqDist = odr.retriever.dist
}
removePeer := manager.removePeer
if disableClientRemovePeer {
removePeer = func(id string) {}
}
if lightSync {
manager.downloader = downloader.New(downloader.LightSync, chainDb, manager.eventMux, nil, blockchain, removePeer)
manager.peers.notify((*downloaderPeerNotify)(manager))
manager.fetcher = newLightFetcher(manager)
}
return manager, nil
}
//removepeer通过从对等端集删除对等端来启动与对等端的断开连接。
func (pm *ProtocolManager) removePeer(id string) {
pm.peers.Unregister(id)
}
func (pm *ProtocolManager) Start(maxPeers int) {
pm.maxPeers = maxPeers
if pm.lightSync {
go pm.syncer()
} else {
pm.clientPool = newFreeClientPool(pm.chainDb, maxPeers, 10000, mclock.System{})
go func() {
for range pm.newPeerCh {
}
}()
}
}
func (pm *ProtocolManager) Stop() {
//显示日志消息。在下载/处理过程中,实际上
//需要5到10秒,因此需要反馈。
log.Info("Stopping light Ethereum protocol")
//退出同步循环。
//完成此发送后,将不接受任何新对等方。
pm.noMorePeers <- struct{}{}
close(pm.quitSync) //退出同步器,获取器
if pm.clientPool != nil {
pm.clientPool.stop()
}
//断开现有会话。
//这也会关闭对等集上任何新注册的入口。
//已建立但尚未添加到pm.peers的会话
//当他们尝试注册时将退出。
pm.peers.Close()
//等待任何进程操作
pm.wg.Wait()
log.Info("Light Ethereum protocol stopped")
}
//runpeer是给定版本的p2p协议运行函数。
func (pm *ProtocolManager) runPeer(version uint, p *p2p.Peer, rw p2p.MsgReadWriter) error {
var entry *poolEntry
peer := pm.newPeer(int(version), pm.networkId, p, rw)
if pm.serverPool != nil {
entry = pm.serverPool.connect(peer, peer.Node())
}
peer.poolEntry = entry
select {
case pm.newPeerCh <- peer:
pm.wg.Add(1)
defer pm.wg.Done()
err := pm.handle(peer)
if entry != nil {
pm.serverPool.disconnect(entry)
}
return err
case <-pm.quitSync:
if entry != nil {
pm.serverPool.disconnect(entry)
}
return p2p.DiscQuitting
}
}
func (pm *ProtocolManager) newPeer(pv int, nv uint64, p *p2p.Peer, rw p2p.MsgReadWriter) *peer {
return newPeer(pv, nv, p, newMeteredMsgWriter(rw))
}
//handle是为管理LES对等机的生命周期而调用的回调。什么时候?
//此函数终止,对等端断开连接。
func (pm *ProtocolManager) handle(p *peer) error {
//如果这是受信任的对等,则忽略MaxPeers
//在服务器模式下,我们尝试在握手后签入客户端池
if pm.lightSync && pm.peers.Len() >= pm.maxPeers && !p.Peer.Info().Network.Trusted {
return p2p.DiscTooManyPeers
}
p.Log().Debug("Light Ethereum peer connected", "name", p.Name())
//执行LES握手
var (
genesis = pm.blockchain.Genesis()
head = pm.blockchain.CurrentHeader()
hash = head.Hash()
number = head.Number.Uint64()
td = pm.blockchain.GetTd(hash, number)
)
if err := p.Handshake(td, hash, number, genesis.Hash(), pm.server); err != nil {
p.Log().Debug("Light Ethereum handshake failed", "err", err)
return err
}
if !pm.lightSync && !p.Peer.Info().Network.Trusted {
addr, ok := p.RemoteAddr().(*net.TCPAddr)
//测试对等地址不是TCP地址,如果无法进行类型转换,则不使用客户端池
if ok {
id := addr.IP.String()
if !pm.clientPool.connect(id, func() { go pm.removePeer(p.id) }) {
return p2p.DiscTooManyPeers
}
defer pm.clientPool.disconnect(id)
}
}
if rw, ok := p.rw.(*meteredMsgReadWriter); ok {
rw.Init(p.version)
}
//在本地注册对等机
if err := pm.peers.Register(p); err != nil {
p.Log().Error("Light Ethereum peer registration failed", "err", err)
return err
}
defer func() {
if pm.server != nil && pm.server.fcManager != nil && p.fcClient != nil {
p.fcClient.Remove(pm.server.fcManager)
}
pm.removePeer(p.id)
}()
//在下载程序中注册对等点。如果下载者认为它是被禁止的,我们会断开
if pm.lightSync {
p.lock.Lock()
head := p.headInfo
p.lock.Unlock()
if pm.fetcher != nil {
pm.fetcher.announce(p, head)
}
if p.poolEntry != nil {
pm.serverPool.registered(p.poolEntry)
}
}
stop := make(chan struct{})
defer close(stop)
go func() {
//新块通知循环
for {
select {
case announce := <-p.announceChn:
p.SendAnnounce(announce)
case <-stop:
return
}
}
}()
//主回路。处理传入消息。
for {
if err := pm.handleMsg(p); err != nil {
p.Log().Debug("Light Ethereum message handling failed", "err", err)
return err
}
}
}
var reqList = []uint64{GetBlockHeadersMsg, GetBlockBodiesMsg, GetCodeMsg, GetReceiptsMsg, GetProofsV1Msg, SendTxMsg, SendTxV2Msg, GetTxStatusMsg, GetHeaderProofsMsg, GetProofsV2Msg, GetHelperTrieProofsMsg}
//每当从远程服务器接收到入站消息时,将调用handlemsg。
//同龄人。返回任何错误时,远程连接被断开。
func (pm *ProtocolManager) handleMsg(p *peer) error {
//从远程对等端读取下一条消息,并确保它被完全消耗掉。
msg, err := p.rw.ReadMsg()
if err != nil {
return err
}
p.Log().Trace("Light Ethereum message arrived", "code", msg.Code, "bytes", msg.Size)
costs := p.fcCosts[msg.Code]
reject := func(reqCnt, maxCnt uint64) bool {
if p.fcClient == nil || reqCnt > maxCnt {
return true
}
bufValue, _ := p.fcClient.AcceptRequest()
cost := costs.baseCost + reqCnt*costs.reqCost
if cost > pm.server.defParams.BufLimit {
cost = pm.server.defParams.BufLimit
}
if cost > bufValue {
recharge := time.Duration((cost - bufValue) * 1000000 / pm.server.defParams.MinRecharge)
p.Log().Error("Request came too early", "recharge", common.PrettyDuration(recharge))
return true
}
return false
}
if msg.Size > ProtocolMaxMsgSize {
return errResp(ErrMsgTooLarge, "%v > %v", msg.Size, ProtocolMaxMsgSize)
}
defer msg.Discard()
var deliverMsg *Msg
//根据消息的内容处理消息
switch msg.Code {
case StatusMsg:
p.Log().Trace("Received status message")
//状态消息不应在握手后到达
return errResp(ErrExtraStatusMsg, "uncontrolled status message")
//阻止头查询,收集请求的头并答复
case AnnounceMsg:
p.Log().Trace("Received announce message")
if p.requestAnnounceType == announceTypeNone {
return errResp(ErrUnexpectedResponse, "")
}
var req announceData
if err := msg.Decode(&req); err != nil {
return errResp(ErrDecode, "%v: %v", msg, err)
}
if p.requestAnnounceType == announceTypeSigned {
if err := req.checkSignature(p.ID()); err != nil {
p.Log().Trace("Invalid announcement signature", "err", err)
return err
}
p.Log().Trace("Valid announcement signature")
}
p.Log().Trace("Announce message content", "number", req.Number, "hash", req.Hash, "td", req.Td, "reorg", req.ReorgDepth)
if pm.fetcher != nil {
pm.fetcher.announce(p, &req)
}
case GetBlockHeadersMsg:
p.Log().Trace("Received block header request")
//解码复杂的头查询
var req struct {
ReqID uint64
Query getBlockHeadersData
}
if err := msg.Decode(&req); err != nil {
return errResp(ErrDecode, "%v: %v", msg, err)
}
query := req.Query
if reject(query.Amount, MaxHeaderFetch) {
return errResp(ErrRequestRejected, "")
}
hashMode := query.Origin.Hash != (common.Hash{})
first := true
maxNonCanonical := uint64(100)
//收集邮件头,直到达到提取或网络限制
var (
bytes common.StorageSize
headers []*types.Header
unknown bool
)
for !unknown && len(headers) < int(query.Amount) && bytes < softResponseLimit {
//检索满足查询的下一个标题
var origin *types.Header
if hashMode {
if first {
first = false
origin = pm.blockchain.GetHeaderByHash(query.Origin.Hash)
if origin != nil {
query.Origin.Number = origin.Number.Uint64()
}
} else {
origin = pm.blockchain.GetHeader(query.Origin.Hash, query.Origin.Number)
}
} else {
origin = pm.blockchain.GetHeaderByNumber(query.Origin.Number)
}
if origin == nil {
break
}
headers = append(headers, origin)
bytes += estHeaderRlpSize
//前进到查询的下一个标题
switch {
case hashMode && query.Reverse:
//向Genesis块的基于哈希的遍历
ancestor := query.Skip + 1
if ancestor == 0 {
unknown = true
} else {
query.Origin.Hash, query.Origin.Number = pm.blockchain.GetAncestor(query.Origin.Hash, query.Origin.Number, ancestor, &maxNonCanonical)
unknown = (query.Origin.Hash == common.Hash{})
}
case hashMode && !query.Reverse:
//基于哈希的叶块遍历
var (
current = origin.Number.Uint64()
next = current + query.Skip + 1
)
if next <= current {
infos, _ := json.MarshalIndent(p.Peer.Info(), "", " ")
p.Log().Warn("GetBlockHeaders skip overflow attack", "current", current, "skip", query.Skip, "next", next, "attacker", infos)
unknown = true
} else {
if header := pm.blockchain.GetHeaderByNumber(next); header != nil {
nextHash := header.Hash()
expOldHash, _ := pm.blockchain.GetAncestor(nextHash, next, query.Skip+1, &maxNonCanonical)
if expOldHash == query.Origin.Hash {
query.Origin.Hash, query.Origin.Number = nextHash, next
} else {
unknown = true
}
} else {
unknown = true
}
}
case query.Reverse:
//朝向Genesis区块的基于数字的遍历
if query.Origin.Number >= query.Skip+1 {
query.Origin.Number -= query.Skip + 1
} else {
unknown = true
}
case !query.Reverse:
//面向叶块的基于数字的遍历
query.Origin.Number += query.Skip + 1
}
}
bv, rcost := p.fcClient.RequestProcessed(costs.baseCost + query.Amount*costs.reqCost)
pm.server.fcCostStats.update(msg.Code, query.Amount, rcost)
return p.SendBlockHeaders(req.ReqID, bv, headers)
case BlockHeadersMsg:
if pm.downloader == nil {
return errResp(ErrUnexpectedResponse, "")
}
p.Log().Trace("Received block header response message")
//我们以前的一个请求收到了一批头文件
var resp struct {
ReqID, BV uint64
Headers []*types.Header
}
if err := msg.Decode(&resp); err != nil {
return errResp(ErrDecode, "msg %v: %v", msg, err)
}
p.fcServer.GotReply(resp.ReqID, resp.BV)
if pm.fetcher != nil && pm.fetcher.requestedID(resp.ReqID) {
pm.fetcher.deliverHeaders(p, resp.ReqID, resp.Headers)
} else {
err := pm.downloader.DeliverHeaders(p.id, resp.Headers)
if err != nil {
log.Debug(fmt.Sprint(err))
}
}
case GetBlockBodiesMsg:
p.Log().Trace("Received block bodies request")
//解码检索消息
var req struct {
ReqID uint64
Hashes []common.Hash
}
if err := msg.Decode(&req); err != nil {
return errResp(ErrDecode, "msg %v: %v", msg, err)
}
//收集块,直到达到获取或网络限制
var (
bytes int
bodies []rlp.RawValue
)
reqCnt := len(req.Hashes)
if reject(uint64(reqCnt), MaxBodyFetch) {
return errResp(ErrRequestRejected, "")
}
for _, hash := range req.Hashes {
if bytes >= softResponseLimit {
break
}
//检索请求的块体,如果找到足够的块体,则停止
if number := rawdb.ReadHeaderNumber(pm.chainDb, hash); number != nil {
if data := rawdb.ReadBodyRLP(pm.chainDb, hash, *number); len(data) != 0 {
bodies = append(bodies, data)
bytes += len(data)
}
}
}
bv, rcost := p.fcClient.RequestProcessed(costs.baseCost + uint64(reqCnt)*costs.reqCost)
pm.server.fcCostStats.update(msg.Code, uint64(reqCnt), rcost)
return p.SendBlockBodiesRLP(req.ReqID, bv, bodies)
case BlockBodiesMsg:
if pm.odr == nil {
return errResp(ErrUnexpectedResponse, "")
}
p.Log().Trace("Received block bodies response")
//我们以前的一个要求得到了一批尸体。
var resp struct {
ReqID, BV uint64
Data []*types.Body
}
if err := msg.Decode(&resp); err != nil {
return errResp(ErrDecode, "msg %v: %v", msg, err)
}
p.fcServer.GotReply(resp.ReqID, resp.BV)
deliverMsg = &Msg{
MsgType: MsgBlockBodies,
ReqID: resp.ReqID,
Obj: resp.Data,
}
case GetCodeMsg:
p.Log().Trace("Received code request")
//解码检索消息
var req struct {
ReqID uint64
Reqs []CodeReq
}
if err := msg.Decode(&req); err != nil {
return errResp(ErrDecode, "msg %v: %v", msg, err)
}
//收集状态数据,直到达到提取或网络限制
var (
bytes int
data [][]byte
)
reqCnt := len(req.Reqs)
if reject(uint64(reqCnt), MaxCodeFetch) {
return errResp(ErrRequestRejected, "")
}
for _, req := range req.Reqs {
//检索请求的状态项,如果找到足够的,则停止
if number := rawdb.ReadHeaderNumber(pm.chainDb, req.BHash); number != nil {
if header := rawdb.ReadHeader(pm.chainDb, req.BHash, *number); header != nil {
statedb, err := pm.blockchain.State()
if err != nil {
continue
}
account, err := pm.getAccount(statedb, header.Root, common.BytesToHash(req.AccKey))
if err != nil {
continue
}
code, _ := statedb.Database().TrieDB().Node(common.BytesToHash(account.CodeHash))
data = append(data, code)
if bytes += len(code); bytes >= softResponseLimit {
break
}
}
}
}
bv, rcost := p.fcClient.RequestProcessed(costs.baseCost + uint64(reqCnt)*costs.reqCost)
pm.server.fcCostStats.update(msg.Code, uint64(reqCnt), rcost)
return p.SendCode(req.ReqID, bv, data)
case CodeMsg:
if pm.odr == nil {
return errResp(ErrUnexpectedResponse, "")
}
p.Log().Trace("Received code response")
//一批节点状态数据到达了我们以前的一个请求
var resp struct {
ReqID, BV uint64
Data [][]byte
}
if err := msg.Decode(&resp); err != nil {
return errResp(ErrDecode, "msg %v: %v", msg, err)
}
p.fcServer.GotReply(resp.ReqID, resp.BV)
deliverMsg = &Msg{
MsgType: MsgCode,
ReqID: resp.ReqID,
Obj: resp.Data,
}
case GetReceiptsMsg:
p.Log().Trace("Received receipts request")
//解码检索消息
var req struct {
ReqID uint64
Hashes []common.Hash
}
if err := msg.Decode(&req); err != nil {
return errResp(ErrDecode, "msg %v: %v", msg, err)
}
//收集状态数据,直到达到提取或网络限制
var (
bytes int
receipts []rlp.RawValue
)
reqCnt := len(req.Hashes)
if reject(uint64(reqCnt), MaxReceiptFetch) {
return errResp(ErrRequestRejected, "")
}
for _, hash := range req.Hashes {
if bytes >= softResponseLimit {
break
}
//检索请求块的收据,如果我们不知道,则跳过
var results types.Receipts
if number := rawdb.ReadHeaderNumber(pm.chainDb, hash); number != nil {
results = rawdb.ReadReceipts(pm.chainDb, hash, *number)
}
if results == nil {
if header := pm.blockchain.GetHeaderByHash(hash); header == nil || header.ReceiptHash != types.EmptyRootHash {
continue
}
}
//如果已知,则对响应数据包进行编码和排队
if encoded, err := rlp.EncodeToBytes(results); err != nil {
log.Error("Failed to encode receipt", "err", err)
} else {
receipts = append(receipts, encoded)
bytes += len(encoded)
}
}
bv, rcost := p.fcClient.RequestProcessed(costs.baseCost + uint64(reqCnt)*costs.reqCost)
pm.server.fcCostStats.update(msg.Code, uint64(reqCnt), rcost)
return p.SendReceiptsRLP(req.ReqID, bv, receipts)
case ReceiptsMsg:
if pm.odr == nil {
return errResp(ErrUnexpectedResponse, "")
}
p.Log().Trace("Received receipts response")
//我们以前的一个请求收到了一批收据
var resp struct {
ReqID, BV uint64
Receipts []types.Receipts
}
if err := msg.Decode(&resp); err != nil {
return errResp(ErrDecode, "msg %v: %v", msg, err)
}
p.fcServer.GotReply(resp.ReqID, resp.BV)
deliverMsg = &Msg{
MsgType: MsgReceipts,
ReqID: resp.ReqID,
Obj: resp.Receipts,
}
case GetProofsV1Msg:
p.Log().Trace("Received proofs request")
//解码检索消息
var req struct {
ReqID uint64
Reqs []ProofReq
}
if err := msg.Decode(&req); err != nil {
return errResp(ErrDecode, "msg %v: %v", msg, err)
}
//收集状态数据,直到达到提取或网络限制
var (
bytes int
proofs proofsData
)
reqCnt := len(req.Reqs)
if reject(uint64(reqCnt), MaxProofsFetch) {
return errResp(ErrRequestRejected, "")
}
for _, req := range req.Reqs {
//检索请求的状态项,如果找到足够的,则停止
if number := rawdb.ReadHeaderNumber(pm.chainDb, req.BHash); number != nil {
if header := rawdb.ReadHeader(pm.chainDb, req.BHash, *number); header != nil {
statedb, err := pm.blockchain.State()
if err != nil {
continue
}
var trie state.Trie
if len(req.AccKey) > 0 {
account, err := pm.getAccount(statedb, header.Root, common.BytesToHash(req.AccKey))
if err != nil {
continue
}
trie, _ = statedb.Database().OpenStorageTrie(common.BytesToHash(req.AccKey), account.Root)
} else {
trie, _ = statedb.Database().OpenTrie(header.Root)
}
if trie != nil {
var proof light.NodeList
trie.Prove(req.Key, 0, &proof)
proofs = append(proofs, proof)
if bytes += proof.DataSize(); bytes >= softResponseLimit {
break
}
}
}
}
}
bv, rcost := p.fcClient.RequestProcessed(costs.baseCost + uint64(reqCnt)*costs.reqCost)
pm.server.fcCostStats.update(msg.Code, uint64(reqCnt), rcost)
return p.SendProofs(req.ReqID, bv, proofs)
case GetProofsV2Msg:
p.Log().Trace("Received les/2 proofs request")
//解码检索消息
var req struct {
ReqID uint64
Reqs []ProofReq
}
if err := msg.Decode(&req); err != nil {
return errResp(ErrDecode, "msg %v: %v", msg, err)
}
//收集状态数据,直到达到提取或网络限制
var (
lastBHash common.Hash
statedb *state.StateDB
root common.Hash
)
reqCnt := len(req.Reqs)
if reject(uint64(reqCnt), MaxProofsFetch) {
return errResp(ErrRequestRejected, "")
}
nodes := light.NewNodeSet()
for _, req := range req.Reqs {
//查找属于请求的状态
if statedb == nil || req.BHash != lastBHash {
statedb, root, lastBHash = nil, common.Hash{}, req.BHash
if number := rawdb.ReadHeaderNumber(pm.chainDb, req.BHash); number != nil {
if header := rawdb.ReadHeader(pm.chainDb, req.BHash, *number); header != nil {
statedb, _ = pm.blockchain.State()
root = header.Root
}
}
}
if statedb == nil {
continue
}
//提取请求的帐户或存储检索
var trie state.Trie
if len(req.AccKey) > 0 {
account, err := pm.getAccount(statedb, root, common.BytesToHash(req.AccKey))
if err != nil {
continue
}
trie, _ = statedb.Database().OpenStorageTrie(common.BytesToHash(req.AccKey), account.Root)
} else {
trie, _ = statedb.Database().OpenTrie(root)
}
if trie == nil {
continue
}
//从帐户或stroage trie证明用户的请求
trie.Prove(req.Key, req.FromLevel, nodes)
if nodes.DataSize() >= softResponseLimit {
break
}
}
bv, rcost := p.fcClient.RequestProcessed(costs.baseCost + uint64(reqCnt)*costs.reqCost)
pm.server.fcCostStats.update(msg.Code, uint64(reqCnt), rcost)
return p.SendProofsV2(req.ReqID, bv, nodes.NodeList())
case ProofsV1Msg:
if pm.odr == nil {
return errResp(ErrUnexpectedResponse, "")
}
p.Log().Trace("Received proofs response")
//我们以前的一个要求得到了一批Merkle证明
var resp struct {
ReqID, BV uint64
Data []light.NodeList
}
if err := msg.Decode(&resp); err != nil {
return errResp(ErrDecode, "msg %v: %v", msg, err)
}
p.fcServer.GotReply(resp.ReqID, resp.BV)
deliverMsg = &Msg{
MsgType: MsgProofsV1,
ReqID: resp.ReqID,
Obj: resp.Data,
}
case ProofsV2Msg:
if pm.odr == nil {
return errResp(ErrUnexpectedResponse, "")
}
p.Log().Trace("Received les/2 proofs response")
//我们以前的一个要求得到了一批Merkle证明
var resp struct {
ReqID, BV uint64
Data light.NodeList
}
if err := msg.Decode(&resp); err != nil {
return errResp(ErrDecode, "msg %v: %v", msg, err)
}
p.fcServer.GotReply(resp.ReqID, resp.BV)
deliverMsg = &Msg{
MsgType: MsgProofsV2,
ReqID: resp.ReqID,
Obj: resp.Data,
}
case GetHeaderProofsMsg:
p.Log().Trace("Received headers proof request")
//解码检索消息
var req struct {
ReqID uint64
Reqs []ChtReq
}
if err := msg.Decode(&req); err != nil {
return errResp(ErrDecode, "msg %v: %v", msg, err)
}
//收集状态数据,直到达到提取或网络限制
var (
bytes int
proofs []ChtResp
)
reqCnt := len(req.Reqs)
if reject(uint64(reqCnt), MaxHelperTrieProofsFetch) {
return errResp(ErrRequestRejected, "")
}
trieDb := trie.NewDatabase(ethdb.NewTable(pm.chainDb, light.ChtTablePrefix))
for _, req := range req.Reqs {
if header := pm.blockchain.GetHeaderByNumber(req.BlockNum); header != nil {
sectionHead := rawdb.ReadCanonicalHash(pm.chainDb, req.ChtNum*pm.iConfig.ChtSize-1)
if root := light.GetChtRoot(pm.chainDb, req.ChtNum-1, sectionHead); root != (common.Hash{}) {
trie, err := trie.New(root, trieDb)
if err != nil {
continue
}
var encNumber [8]byte
binary.BigEndian.PutUint64(encNumber[:], req.BlockNum)
var proof light.NodeList
trie.Prove(encNumber[:], 0, &proof)
proofs = append(proofs, ChtResp{Header: header, Proof: proof})
if bytes += proof.DataSize() + estHeaderRlpSize; bytes >= softResponseLimit {
break
}
}
}
}
bv, rcost := p.fcClient.RequestProcessed(costs.baseCost + uint64(reqCnt)*costs.reqCost)
pm.server.fcCostStats.update(msg.Code, uint64(reqCnt), rcost)
return p.SendHeaderProofs(req.ReqID, bv, proofs)
case GetHelperTrieProofsMsg:
p.Log().Trace("Received helper trie proof request")
//解码检索消息
var req struct {
ReqID uint64
Reqs []HelperTrieReq
}
if err := msg.Decode(&req); err != nil {
return errResp(ErrDecode, "msg %v: %v", msg, err)
}
//收集状态数据,直到达到提取或网络限制
var (
auxBytes int
auxData [][]byte
)
reqCnt := len(req.Reqs)
if reject(uint64(reqCnt), MaxHelperTrieProofsFetch) {
return errResp(ErrRequestRejected, "")
}
var (
lastIdx uint64
lastType uint
root common.Hash
auxTrie *trie.Trie
)
nodes := light.NewNodeSet()
for _, req := range req.Reqs {
if auxTrie == nil || req.Type != lastType || req.TrieIdx != lastIdx {
auxTrie, lastType, lastIdx = nil, req.Type, req.TrieIdx
var prefix string
if root, prefix = pm.getHelperTrie(req.Type, req.TrieIdx); root != (common.Hash{}) {
auxTrie, _ = trie.New(root, trie.NewDatabase(ethdb.NewTable(pm.chainDb, prefix)))
}
}
if req.AuxReq == auxRoot {
var data []byte
if root != (common.Hash{}) {
data = root[:]
}
auxData = append(auxData, data)
auxBytes += len(data)
} else {
if auxTrie != nil {
auxTrie.Prove(req.Key, req.FromLevel, nodes)
}
if req.AuxReq != 0 {
data := pm.getHelperTrieAuxData(req)
auxData = append(auxData, data)
auxBytes += len(data)
}
}
if nodes.DataSize()+auxBytes >= softResponseLimit {
break
}
}
bv, rcost := p.fcClient.RequestProcessed(costs.baseCost + uint64(reqCnt)*costs.reqCost)
pm.server.fcCostStats.update(msg.Code, uint64(reqCnt), rcost)
return p.SendHelperTrieProofs(req.ReqID, bv, HelperTrieResps{Proofs: nodes.NodeList(), AuxData: auxData})
case HeaderProofsMsg:
if pm.odr == nil {
return errResp(ErrUnexpectedResponse, "")
}
p.Log().Trace("Received headers proof response")
var resp struct {
ReqID, BV uint64
Data []ChtResp
}
if err := msg.Decode(&resp); err != nil {
return errResp(ErrDecode, "msg %v: %v", msg, err)
}
p.fcServer.GotReply(resp.ReqID, resp.BV)
deliverMsg = &Msg{
MsgType: MsgHeaderProofs,
ReqID: resp.ReqID,
Obj: resp.Data,
}
case HelperTrieProofsMsg:
if pm.odr == nil {
return errResp(ErrUnexpectedResponse, "")