// 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 (
"encoding/binary"
"encoding/json"
"fmt"
"math/big"
"net"
"sync"
"time"
"github.com/dexon-foundation/dexon/common"
"github.com/dexon-foundation/dexon/common/mclock"
"github.com/dexon-foundation/dexon/consensus"
"github.com/dexon-foundation/dexon/core"
"github.com/dexon-foundation/dexon/core/rawdb"
"github.com/dexon-foundation/dexon/core/state"
"github.com/dexon-foundation/dexon/core/types"
"github.com/dexon-foundation/dexon/eth/downloader"
"github.com/dexon-foundation/dexon/ethdb"
"github.com/dexon-foundation/dexon/event"
"github.com/dexon-foundation/dexon/light"
"github.com/dexon-foundation/dexon/log"
"github.com/dexon-foundation/dexon/p2p"
"github.com/dexon-foundation/dexon/p2p/discv5"
"github.com/dexon-foundation/dexon/params"
"github.com/dexon-foundation/dexon/rlp"
"github.com/dexon-foundation/dexon/trie"
)
const (
softResponseLimit = 2 * 1024 * 1024 // Target maximum size of returned blocks, headers or node data.
estHeaderRlpSize = 500 // Approximate size of an RLP encoded block header
ethVersion = 63 // equivalent eth version for the downloader
MaxHeaderFetch = 192 // Amount of block headers to be fetched per retrieval request
MaxBodyFetch = 32 // Amount of block bodies to be fetched per retrieval request
MaxReceiptFetch = 128 // Amount of transaction receipts to allow fetching per request
MaxCodeFetch = 64 // Amount of contract codes to allow fetching per request
MaxProofsFetch = 64 // Amount of merkle proofs to be fetched per retrieval request
MaxHelperTrieProofsFetch = 64 // Amount of merkle proofs to be fetched per retrieval request
MaxTxSend = 64 // Amount of transactions to be send per request
MaxTxStatus = 256 // Amount of transactions to queried per request
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
// channels for fetcher, syncer, txsyncLoop
newPeerCh chan *peer
quitSync chan struct{}
noMorePeers chan struct{}
// wait group is used for graceful shutdowns during downloading
// and processing
wg *sync.WaitGroup
}
// NewProtocolManager returns a new ethereum sub protocol manager. The Ethereum sub protocol manages peers capable
// with the ethereum network.
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) {
// Create the protocol manager with the base fields
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 initiates disconnection from a peer by removing it from the peer set
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() {
// Showing a log message. During download / process this could actually
// take between 5 to 10 seconds and therefor feedback is required.
log.Info("Stopping light Ethereum protocol")
// Quit the sync loop.
// After this send has completed, no new peers will be accepted.
pm.noMorePeers <- struct{}{}
close(pm.quitSync) // quits syncer, fetcher
if pm.clientPool != nil {
pm.clientPool.stop()
}
// Disconnect existing sessions.
// This also closes the gate for any new registrations on the peer set.
// sessions which are already established but not added to pm.peers yet
// will exit when they try to register.
pm.peers.Close()
// Wait for any process action
pm.wg.Wait()
log.Info("Light Ethereum protocol stopped")
}
// runPeer is the p2p protocol run function for the given version.
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 is the callback invoked to manage the life cycle of a les peer. When
// this function terminates, the peer is disconnected.
func (pm *ProtocolManager) handle(p *peer) error {
// Ignore maxPeers if this is a trusted peer
// In server mode we try to check into the client pool after handshake
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())
// Execute the LES handshake
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)
// test peer address is not a tcp address, don't use client pool if can not typecast
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)
}
// Register the peer locally
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)
}()
// Register the peer in the downloader. If the downloader considers it banned, we disconnect
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() {
// new block announce loop
for {
select {
case announce := <-p.announceChn:
p.SendAnnounce(announce)
case <-stop:
return
}
}
}()
// main loop. handle incoming messages.
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}
// handleMsg is invoked whenever an inbound message is received from a remote
// peer. The remote connection is torn down upon returning any error.
func (pm *ProtocolManager) handleMsg(p *peer) error {
// Read the next message from the remote peer, and ensure it's fully consumed
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
// Handle the message depending on its contents
switch msg.Code {
case StatusMsg:
p.Log().Trace("Received status message")
// Status messages should never arrive after the handshake
return errResp(ErrExtraStatusMsg, "uncontrolled status message")
// Block header query, collect the requested headers and reply
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")
// Decode the complex header query
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)
// Gather headers until the fetch or network limits is reached
var (
bytes common.StorageSize
headers []*types.Header
unknown bool
)
for !unknown && len(headers) < int(query.Amount) && bytes < softResponseLimit {
// Retrieve the next header satisfying the query
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
// Advance to the next header of the query
switch {
case hashMode && query.Reverse:
// Hash based traversal towards the genesis block
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:
// Hash based traversal towards the leaf block
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:
// Number based traversal towards the genesis block
if query.Origin.Number >= query.Skip+1 {
query.Origin.Number -= query.Skip + 1
} else {
unknown = true
}
case !query.Reverse:
// Number based traversal towards the leaf block
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")
// A batch of headers arrived to one of our previous requests
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")
// Decode the retrieval message
var req struct {
ReqID uint64
Hashes []common.Hash
}
if err := msg.Decode(&req); err != nil {
return errResp(ErrDecode, "msg %v: %v", msg, err)
}
// Gather blocks until the fetch or network limits is reached
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
}
// Retrieve the requested block body, stopping if enough was found
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")
// A batch of block bodies arrived to one of our previous requests
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")
// Decode the retrieval message
var req struct {
ReqID uint64
Reqs []CodeReq
}
if err := msg.Decode(&req); err != nil {
return errResp(ErrDecode, "msg %v: %v", msg, err)
}
// Gather state data until the fetch or network limits is reached
var (
bytes int
data [][]byte
)
reqCnt := len(req.Reqs)
if reject(uint64(reqCnt), MaxCodeFetch) {
return errResp(ErrRequestRejected, "")
}
for _, req := range req.Reqs {
// Retrieve the requested state entry, stopping if enough was found
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")
// A batch of node state data arrived to one of our previous requests
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")
// Decode the retrieval message
var req struct {
ReqID uint64
Hashes []common.Hash
}
if err := msg.Decode(&req); err != nil {
return errResp(ErrDecode, "msg %v: %v", msg, err)
}
// Gather state data until the fetch or network limits is reached
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
}
// Retrieve the requested block's receipts, skipping if unknown to us
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
}
}
// If known, encode and queue for response packet
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")
// A batch of receipts arrived to one of our previous requests
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")
// Decode the retrieval message
var req struct {
ReqID uint64
Reqs []ProofReq
}
if err := msg.Decode(&req); err != nil {
return errResp(ErrDecode, "msg %v: %v", msg, err)
}
// Gather state data until the fetch or network limits is reached
var (
bytes int
proofs proofsData
)
reqCnt := len(req.Reqs)
if reject(uint64(reqCnt), MaxProofsFetch) {
return errResp(ErrRequestRejected, "")
}
for _, req := range req.Reqs {
// Retrieve the requested state entry, stopping if enough was found
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")
// Decode the retrieval message
var req struct {
ReqID uint64
Reqs []ProofReq
}
if err := msg.Decode(&req); err != nil {
return errResp(ErrDecode, "msg %v: %v", msg, err)
}
// Gather state data until the fetch or network limits is reached
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 {
// Look up the state belonging to the request
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
}
// Pull the account or storage trie of the request
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
}
// Prove the user's request from the account or stroage trie
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")
// A batch of merkle proofs arrived to one of our previous requests
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")
// A batch of merkle proofs arrived to one of our previous requests
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")
// Decode the retrieval message
var req struct {
ReqID uint64
Reqs []ChtReq
}
if err := msg.Decode(&req); err != nil {
return errResp(ErrDecode, "msg %v: %v", msg, err)
}
// Gather state data until the fetch or network limits is reached
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")
// Decode the retrieval message
var req struct {
ReqID uint64
Reqs []HelperTrieReq
}
if err := msg.Decode(&req); err != nil {
return errResp(ErrDecode, "msg %v: %v", msg, err)
}
// Gather state data until the fetch or network limits is reached
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, "")
}
p.Log().Trace("Received helper trie proof response")
var resp struct {
ReqID, BV uint64
Data HelperTrieResps
}
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: MsgHelperTrieProofs,
ReqID: resp.ReqID,
Obj: resp.Data,
}
case SendTxMsg:
if pm.txpool == nil {
return errResp(ErrRequestRejected, "")
}
// Transactions arrived, parse all of them and deliver to the pool
var txs []*types.Transaction
if err := msg.Decode(&txs); err != nil {
return errResp(ErrDecode, "msg %v: %v", msg, err)
}
reqCnt := len(txs)
if reject(uint64(reqCnt), MaxTxSend) {
return errResp(ErrRequestRejected, "")
}
pm.txpool.AddRemotes(txs)
_, rcost := p.fcClient.RequestProcessed(costs.baseCost + uint64(reqCnt)*costs.reqCost)
pm.server.fcCostStats.update(msg.Code, uint64(reqCnt), rcost)
case SendTxV2Msg:
if pm.txpool == nil {
return errResp(ErrRequestRejected, "")
}
// Transactions arrived, parse all of them and deliver to the pool
var req struct {
ReqID uint64
Txs []*types.Transaction
}
if err := msg.Decode(&req); err != nil {
return errResp(ErrDecode, "msg %v: %v", msg, err)
}
reqCnt := len(req.Txs)
if reject(uint64(reqCnt), MaxTxSend) {
return errResp(ErrRequestRejected, "")
}
hashes := make([]common.Hash, len(req.Txs))
for i, tx := range req.Txs {
hashes[i] = tx.Hash()
}
stats := pm.txStatus(hashes)
for i, stat := range stats {
if stat.Status == core.TxStatusUnknown {
if errs := pm.txpool.AddRemotes([]*types.Transaction{req.Txs[i]}); errs[0] != nil {
stats[i].Error = errs[0].Error()
continue
}
stats[i] = pm.txStatus([]common.Hash{hashes[i]})[0]
}
}
bv, rcost := p.fcClient.RequestProcessed(costs.baseCost + uint64(reqCnt)*costs.reqCost)
pm.server.fcCostStats.update(msg.Code, uint64(reqCnt), rcost)
return p.SendTxStatus(req.ReqID, bv, stats)
case GetTxStatusMsg:
if pm.txpool == nil {
return errResp(ErrUnexpectedResponse, "")
}
// Transactions arrived, parse all of them and deliver to the pool
var req struct {
ReqID uint64
Hashes []common.Hash
}
if err := msg.Decode(&req); err != nil {
return errResp(ErrDecode, "msg %v: %v", msg, err)
}
reqCnt := len(req.Hashes)
if reject(uint64(reqCnt), MaxTxStatus) {
return errResp(ErrRequestRejected, "")
}
bv, rcost := p.fcClient.RequestProcessed(costs.baseCost + uint64(reqCnt)*costs.reqCost)
pm.server.fcCostStats.update(msg.Code, uint64(reqCnt), rcost)
return p.SendTxStatus(req.ReqID, bv, pm.txStatus(req.Hashes))
case TxStatusMsg:
if pm.odr == nil {
return errResp(ErrUnexpectedResponse, "")
}
p.Log().Trace("Received tx status response")
var resp struct {
ReqID, BV uint64
Status []txStatus
}
if err := msg.Decode(&resp); err != nil {
return errResp(ErrDecode, "msg %v: %v", msg, err)
}
p.fcServer.GotReply(resp.ReqID, resp.BV)
default:
p.Log().Trace("Received unknown message", "code", msg.Code)
return errResp(ErrInvalidMsgCode, "%v", msg.Code)
}
if deliverMsg != nil {
err := pm.retriever.deliver(p, deliverMsg)
if err != nil {
p.responseErrors++
if p.responseErrors > maxResponseErrors {
return err
}
}
}
return nil
}
// getAccount retrieves an account from the state based at root.
func (pm *ProtocolManager) getAccount(statedb *state.StateDB, root, hash common.Hash) (state.Account, error) {
trie, err := trie.New(root, statedb.Database().TrieDB())
if err != nil {
return state.Account{}, err
}
blob, err := trie.TryGet(hash[:])
if err != nil {
return state.Account{}, err
}
var account state.Account
if err = rlp.DecodeBytes(blob, &account); err != nil {
return state.Account{}, err
}
return account, nil
}
// getHelperTrie returns the post-processed trie root for the given trie ID and section index
func (pm *ProtocolManager) getHelperTrie(id uint, idx uint64) (common.Hash, string) {
switch id {
case htCanonical:
idxV1 := (idx+1)*(pm.iConfig.PairChtSize/pm.iConfig.ChtSize) - 1
sectionHead := rawdb.ReadCanonicalHash(pm.chainDb, (idxV1+1)*pm.iConfig.ChtSize-1)
return light.GetChtRoot(pm.chainDb, idxV1, sectionHead), light.ChtTablePrefix
case htBloomBits:
sectionHead := rawdb.ReadCanonicalHash(pm.chainDb, (idx+1)*pm.iConfig.BloomTrieSize-1)
return light.GetBloomTrieRoot(pm.chainDb, idx, sectionHead), light.BloomTrieTablePrefix
}
return common.Hash{}, ""
}
// getHelperTrieAuxData returns requested auxiliary data for the given HelperTrie request
func (pm *ProtocolManager) getHelperTrieAuxData(req HelperTrieReq) []byte {
if req.Type == htCanonical && req.AuxReq == auxHeader && len(req.Key) == 8 {
blockNum := binary.BigEndian.Uint64(req.Key)
hash := rawdb.ReadCanonicalHash(pm.chainDb, blockNum)
return rawdb.ReadHeaderRLP(pm.chainDb, hash, blockNum)
}
return nil
}
func (pm *ProtocolManager) txStatus(hashes []common.Hash) []txStatus {
stats := make([]txStatus, len(hashes))
for i, stat := range pm.txpool.Status(hashes) {
// Save the status we've got from the transaction pool
stats[i].Status = stat
// If the transaction is unknown to the pool, try looking it up locally
if stat == core.TxStatusUnknown {
if block, number, index := rawdb.ReadTxLookupEntry(pm.chainDb, hashes[i]); block != (common.Hash{}) {
stats[i].Status = core.TxStatusIncluded
stats[i].Lookup = &rawdb.TxLookupEntry{BlockHash: block, BlockIndex: number, Index: index}
}
}
}
return stats
}
// downloaderPeerNotify implements peerSetNotify
type downloaderPeerNotify ProtocolManager
type peerConnection struct {
manager *ProtocolManager
peer *peer
}
func (pc *peerConnection) Head() (common.Hash, *big.Int) {
return pc.peer.HeadAndTd()
}
func (pc *peerConnection) RequestHeadersByHash(origin common.Hash, amount int, skip int, reverse bool) error {
reqID := genReqID()
rq := &distReq{
getCost: func(dp distPeer) uint64 {
peer := dp.(*peer)
return peer.GetRequestCost(GetBlockHeadersMsg, amount)
},
canSend: func(dp distPeer) bool {
return dp.(*peer) == pc.peer
},
request: func(dp distPeer) func() {
peer := dp.(*peer)
cost := peer.GetRequestCost(GetBlockHeadersMsg, amount)
peer.fcServer.QueueRequest(reqID, cost)
return func() { peer.RequestHeadersByHash(reqID, cost, origin, amount, skip, reverse) }
},
}
_, ok := <-pc.manager.reqDist.queue(rq)
if !ok {
return light.ErrNoPeers
}
return nil
}
func (pc *peerConnection) RequestHeadersByNumber(origin uint64, amount int, skip int, reverse bool) error {
reqID := genReqID()
rq := &distReq{
getCost: func(dp distPeer) uint64 {
peer := dp.(*peer)
return peer.GetRequestCost(GetBlockHeadersMsg, amount)
},
canSend: func(dp distPeer) bool {
return dp.(*peer) == pc.peer
},
request: func(dp distPeer) func() {
peer := dp.(*peer)
cost := peer.GetRequestCost(GetBlockHeadersMsg, amount)
peer.fcServer.QueueRequest(reqID, cost)
return func() { peer.RequestHeadersByNumber(reqID, cost, origin, amount, skip, reverse) }
},
}
_, ok := <-pc.manager.reqDist.queue(rq)
if !ok {
return light.ErrNoPeers
}
return nil
}
func (d *downloaderPeerNotify) registerPeer(p *peer) {
pm := (*ProtocolManager)(d)
pc := &peerConnection{
manager: pm,
peer: p,
}
pm.downloader.RegisterLightPeer(p.id, ethVersion, pc)
}
func (d *downloaderPeerNotify) unregisterPeer(p *peer) {
pm := (*ProtocolManager)(d)
pm.downloader.UnregisterPeer(p.id)
}
