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les: fixed selectPeer deadlock, improved request distribution

Browse Source 
les/flowcontrol: using proper types for relative and absolute times
This commit is contained in:
Zsolt Felfoldi 2016-12-15 11:13:52 +01:00
parent e0ee0cc66a
commit 93f9c023cc
10 changed files with 271 additions and 121 deletions
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46
les/fetcher.go
View File

@ -125,7 +125,7 @@ func (f *lightFetcher) syncLoop() {
f.pm.wg.Add(1)
defer f.pm.wg.Done()
requestStarted := false
requesting := false
for {
select {
case <-f.pm.quitSync:
@ -134,13 +134,13 @@ func (f *lightFetcher) syncLoop() {
// no further requests are necessary or possible
case newAnnounce := <-f.requestChn:
f.lock.Lock()
s := requestStarted
requestStarted = false
s := requesting
requesting = false
if !f.syncing && !(newAnnounce && s) {
if peer, node, amount := f.nextRequest(); node != nil {
requestStarted = true
reqID, started := f.request(peer, node, amount)
if started {
reqID := getNextReqID()
if peer, node, amount, retry := f.nextRequest(reqID); node != nil {
requesting = true
if reqID, ok := f.request(peer, reqID, node, amount); ok {
go func() {
time.Sleep(softRequestTimeout)
f.reqMu.Lock()
@ -154,6 +154,14 @@ func (f *lightFetcher) syncLoop() {
f.requestChn <- false
}()
}
} else {
if retry {
requesting = true
go func() {
time.Sleep(time.Millisecond * 100)
f.requestChn <- false
}()
}
}
}
f.lock.Unlock()
@ -344,10 +352,11 @@ func (f *lightFetcher) peerHasBlock(p *peer, hash common.Hash, number uint64) bo
}
// request initiates a header download request from a certain peer
func (f *lightFetcher) request(p *peer, n *fetcherTreeNode, amount uint64) (uint64, bool) {
func (f *lightFetcher) request(p *peer, reqID uint64, n *fetcherTreeNode, amount uint64) (uint64, bool) {
fp := f.peers[p]
if fp == nil {
glog.V(logger.Debug).Infof("request: unknown peer")
p.fcServer.DeassignRequest(reqID)
return 0, false
}
if fp.bestConfirmed == nil || fp.root == nil || !f.checkKnownNode(p, fp.root) {
@ -357,10 +366,10 @@ func (f *lightFetcher) request(p *peer, n *fetcherTreeNode, amount uint64) (uint
f.pm.synchronise(p)
f.syncDone <- p
}()
p.fcServer.DeassignRequest(reqID)
return 0, false
}
reqID := getNextReqID()
n.requested = true
cost := p.GetRequestCost(GetBlockHeadersMsg, int(amount))
p.fcServer.SendRequest(reqID, cost)
@ -400,7 +409,7 @@ func (f *lightFetcher) requestedID(reqID uint64) bool {
// nextRequest selects the peer and announced head to be requested next, amount
// to be downloaded starting from the head backwards is also returned
func (f *lightFetcher) nextRequest() (*peer, *fetcherTreeNode, uint64) {
func (f *lightFetcher) nextRequest(reqID uint64) (*peer, *fetcherTreeNode, uint64, bool) {
var (
bestHash common.Hash
bestAmount uint64
@ -420,21 +429,24 @@ func (f *lightFetcher) nextRequest() (*peer, *fetcherTreeNode, uint64) {
}
}
if bestTd == f.maxConfirmedTd {
return nil, nil, 0
return nil, nil, 0, false
}
peer := f.pm.serverPool.selectPeer(func(p *peer) (bool, uint64) {
peer, _, locked := f.pm.serverPool.selectPeer(reqID, func(p *peer) (bool, time.Duration) {
fp := f.peers[p]
if fp == nil || fp.nodeByHash[bestHash] == nil {
return false, 0
}
return true, p.fcServer.CanSend(p.GetRequestCost(GetBlockHeadersMsg, int(bestAmount)))
})
if !locked {
return nil, nil, 0, true
}
var node *fetcherTreeNode
if peer != nil {
node = f.peers[peer].nodeByHash[bestHash]
}
return peer, node, bestAmount
return peer, node, bestAmount, false
}
// deliverHeaders delivers header download request responses for processing
@ -442,9 +454,10 @@ func (f *lightFetcher) deliverHeaders(peer *peer, reqID uint64, headers []*types
f.deliverChn <- fetchResponse{reqID: reqID, headers: headers, peer: peer}
}
// processResponse processes header download request responses
// processResponse processes header download request responses, returns true if successful
func (f *lightFetcher) processResponse(req fetchRequest, resp fetchResponse) bool {
if uint64(len(resp.headers)) != req.amount || resp.headers[0].Hash() != req.hash {
glog.V(logger.Debug).Infof("response mismatch %v %016x != %v %016x", len(resp.headers), resp.headers[0].Hash().Bytes()[:8], req.amount, req.hash[:8])
return false
}
headers := make([]*types.Header, req.amount)
@ -452,12 +465,17 @@ func (f *lightFetcher) processResponse(req fetchRequest, resp fetchResponse) boo
headers[int(req.amount)-1-i] = header
}
if _, err := f.chain.InsertHeaderChain(headers, 1); err != nil {
if err == core.BlockFutureErr {
return true
}
glog.V(logger.Debug).Infof("InsertHeaderChain error: %v", err)
return false
}
tds := make([]*big.Int, len(headers))
for i, header := range headers {
td := f.chain.GetTd(header.Hash(), header.Number.Uint64())
if td == nil {
glog.V(logger.Debug).Infof("TD not found for header %v of %v", i+1, len(headers))
return false
}
tds[i] = td

121
les/flowcontrol/control.go
View File

@ -24,7 +24,7 @@ import (
"github.com/ethereum/go-ethereum/common/mclock"
)
const fcTimeConst = 1000000
const fcTimeConst = time.Millisecond
type ServerParams struct {
BufLimit, MinRecharge uint64
@ -33,7 +33,7 @@ type ServerParams struct {
type ClientNode struct {
params *ServerParams
bufValue uint64
lastTime int64
lastTime mclock.AbsTime
lock sync.Mutex
cm *ClientManager
cmNode *cmNode
@ -44,7 +44,7 @@ func NewClientNode(cm *ClientManager, params *ServerParams) *ClientNode {
cm: cm,
params: params,
bufValue: params.BufLimit,
lastTime: getTime(),
lastTime: mclock.Now(),
}
node.cmNode = cm.addNode(node)
return node
@ -54,12 +54,12 @@ func (peer *ClientNode) Remove(cm *ClientManager) {
cm.removeNode(peer.cmNode)
}
func (peer *ClientNode) recalcBV(time int64) {
func (peer *ClientNode) recalcBV(time mclock.AbsTime) {
dt := uint64(time - peer.lastTime)
if time < peer.lastTime {
dt = 0
}
peer.bufValue += peer.params.MinRecharge * dt / fcTimeConst
peer.bufValue += peer.params.MinRecharge * dt / uint64(fcTimeConst)
if peer.bufValue > peer.params.BufLimit {
peer.bufValue = peer.params.BufLimit
}
@ -70,7 +70,7 @@ func (peer *ClientNode) AcceptRequest() (uint64, bool) {
peer.lock.Lock()
defer peer.lock.Unlock()
time := getTime()
time := mclock.Now()
peer.recalcBV(time)
return peer.bufValue, peer.cm.accept(peer.cmNode, time)
}
@ -79,7 +79,7 @@ func (peer *ClientNode) RequestProcessed(cost uint64) (bv, realCost uint64) {
peer.lock.Lock()
defer peer.lock.Unlock()
time := getTime()
time := mclock.Now()
peer.recalcBV(time)
peer.bufValue -= cost
peer.recalcBV(time)
@ -94,66 +94,127 @@ func (peer *ClientNode) RequestProcessed(cost uint64) (bv, realCost uint64) {
}
type ServerNode struct {
bufEstimate uint64
lastTime int64
params *ServerParams
sumCost uint64 // sum of req costs sent to this server
pending map[uint64]uint64 // value = sumCost after sending the given req
lock sync.RWMutex
bufEstimate uint64
lastTime mclock.AbsTime
params *ServerParams
sumCost uint64 // sum of req costs sent to this server
pending map[uint64]uint64 // value = sumCost after sending the given req
assignedRequest uint64 // when != 0, only the request with the given ID can be sent to this peer
assignToken chan struct{} // send to this channel before assigning, read from it after deassigning
lock sync.RWMutex
}
func NewServerNode(params *ServerParams) *ServerNode {
return &ServerNode{
bufEstimate: params.BufLimit,
lastTime: getTime(),
lastTime: mclock.Now(),
params: params,
pending: make(map[uint64]uint64),
assignToken: make(chan struct{}, 1),
}
}
func getTime() int64 {
return int64(mclock.Now())
}
func (peer *ServerNode) recalcBLE(time int64) {
func (peer *ServerNode) recalcBLE(time mclock.AbsTime) {
dt := uint64(time - peer.lastTime)
if time < peer.lastTime {
dt = 0
}
peer.bufEstimate += peer.params.MinRecharge * dt / fcTimeConst
peer.bufEstimate += peer.params.MinRecharge * dt / uint64(fcTimeConst)
if peer.bufEstimate > peer.params.BufLimit {
peer.bufEstimate = peer.params.BufLimit
}
peer.lastTime = time
}
func (peer *ServerNode) canSend(maxCost uint64) uint64 {
// safetyMargin is added to the flow control waiting time when estimated buffer value is low
const safetyMargin = time.Millisecond * 200
func (peer *ServerNode) canSend(maxCost uint64) time.Duration {
maxCost += uint64(safetyMargin) * peer.params.MinRecharge / uint64(fcTimeConst)
if maxCost > peer.params.BufLimit {
maxCost = peer.params.BufLimit
}
if peer.bufEstimate >= maxCost {
return 0
}
return (maxCost - peer.bufEstimate) * fcTimeConst / peer.params.MinRecharge
return time.Duration((maxCost - peer.bufEstimate) * uint64(fcTimeConst) / peer.params.MinRecharge)
}
func (peer *ServerNode) CanSend(maxCost uint64) uint64 {
// CanSend returns the minimum waiting time required before sending a request
// with the given maximum estimated cost
func (peer *ServerNode) CanSend(maxCost uint64) time.Duration {
peer.lock.RLock()
defer peer.lock.RUnlock()
return peer.canSend(maxCost)
}
// AssignRequest tries to assign the server node to the given request, guaranteeing
// that once it returns true, no request will be sent to the node before this one
func (peer *ServerNode) AssignRequest(reqID uint64) bool {
select {
case peer.assignToken <- struct{}{}:
default:
return false
}
peer.lock.Lock()
peer.assignedRequest = reqID
peer.lock.Unlock()
return true
}
// MustAssignRequest waits until the node can be assigned to the given request.
// It is always guaranteed that assignments are released in a short amount of time.
func (peer *ServerNode) MustAssignRequest(reqID uint64) {
peer.assignToken <- struct{}{}
peer.lock.Lock()
peer.assignedRequest = reqID
peer.lock.Unlock()
}
// DeassignRequest releases a request assignment in case the planned request
// is not being sent.
func (peer *ServerNode) DeassignRequest(reqID uint64) {
peer.lock.Lock()
if peer.assignedRequest == reqID {
peer.assignedRequest = 0
<-peer.assignToken
}
peer.lock.Unlock()
}
// IsAssigned returns true if the server node has already been assigned to a request
// (note that this function returning false does not guarantee that you can assign a request
// immediately afterwards, its only purpose is to help peer selection)
func (peer *ServerNode) IsAssigned() bool {
peer.lock.RLock()
locked := peer.assignedRequest != 0
peer.lock.RUnlock()
return locked
}
// blocks until request can be sent
func (peer *ServerNode) SendRequest(reqID, maxCost uint64) {
peer.lock.Lock()
defer peer.lock.Unlock()
peer.recalcBLE(getTime())
for peer.bufEstimate < maxCost {
wait := time.Duration(peer.canSend(maxCost))
if peer.assignedRequest != reqID {
peer.lock.Unlock()
peer.MustAssignRequest(reqID)
peer.lock.Lock()
}
peer.recalcBLE(mclock.Now())
wait := peer.canSend(maxCost)
for wait > 0 {
peer.lock.Unlock()
time.Sleep(wait)
peer.lock.Lock()
peer.recalcBLE(getTime())
peer.recalcBLE(mclock.Now())
wait = peer.canSend(maxCost)
}
peer.assignedRequest = 0
<-peer.assignToken
peer.bufEstimate -= maxCost
peer.sumCost += maxCost
if reqID >= 0 {
@ -162,14 +223,18 @@ func (peer *ServerNode) SendRequest(reqID, maxCost uint64) {
}
func (peer *ServerNode) GotReply(reqID, bv uint64) {
peer.lock.Lock()
defer peer.lock.Unlock()
if bv > peer.params.BufLimit {
bv = peer.params.BufLimit
}
sc, ok := peer.pending[reqID]
if !ok {
return
}
delete(peer.pending, reqID)
peer.bufEstimate = bv - (peer.sumCost - sc)
peer.lastTime = getTime()
peer.lastTime = mclock.Now()
}

41
les/flowcontrol/manager.go
View File

@ -20,22 +20,23 @@ package flowcontrol
import (
"sync"
"time"
"github.com/ethereum/go-ethereum/common/mclock"
)
const rcConst = 1000000
type cmNode struct {
node *ClientNode
lastUpdate int64
reqAccepted int64
serving, recharging bool
rcWeight uint64
rcValue, rcDelta int64
finishRecharge, startValue int64
node *ClientNode
lastUpdate mclock.AbsTime
serving, recharging bool
rcWeight uint64
rcValue, rcDelta, startValue int64
finishRecharge mclock.AbsTime
}
func (node *cmNode) update(time int64) {
dt := time - node.lastUpdate
func (node *cmNode) update(time mclock.AbsTime) {
dt := int64(time - node.lastUpdate)
node.rcValue += node.rcDelta * dt / rcConst
node.lastUpdate = time
if node.recharging && time >= node.finishRecharge {
@ -62,7 +63,7 @@ func (node *cmNode) set(serving bool, simReqCnt, sumWeight uint64) {
}
if node.recharging {
node.rcDelta = -int64(node.node.cm.rcRecharge * node.rcWeight / sumWeight)
node.finishRecharge = node.lastUpdate + node.rcValue*rcConst/(-node.rcDelta)
node.finishRecharge = node.lastUpdate + mclock.AbsTime(node.rcValue*rcConst/(-node.rcDelta))
}
}
@ -73,7 +74,7 @@ type ClientManager struct {
maxSimReq, maxRcSum uint64
rcRecharge uint64
resumeQueue chan chan bool
time int64
time mclock.AbsTime
}
func NewClientManager(rcTarget, maxSimReq, maxRcSum uint64) *ClientManager {
@ -98,7 +99,7 @@ func (self *ClientManager) Stop() {
}
func (self *ClientManager) addNode(cnode *ClientNode) *cmNode {
time := getTime()
time := mclock.Now()
node := &cmNode{
node: cnode,
lastUpdate: time,
@ -109,7 +110,7 @@ func (self *ClientManager) addNode(cnode *ClientNode) *cmNode {
defer self.lock.Unlock()
self.nodes[node] = struct{}{}
self.update(getTime())
self.update(mclock.Now())
return node
}
@ -117,14 +118,14 @@ func (self *ClientManager) removeNode(node *cmNode) {
self.lock.Lock()
defer self.lock.Unlock()
time := getTime()
time := mclock.Now()
self.stop(node, time)
delete(self.nodes, node)
self.update(time)
}
// recalc sumWeight
func (self *ClientManager) updateNodes(time int64) (rce bool) {
func (self *ClientManager) updateNodes(time mclock.AbsTime) (rce bool) {
var sumWeight, rcSum uint64
for node, _ := range self.nodes {
rc := node.recharging
@ -142,7 +143,7 @@ func (self *ClientManager) updateNodes(time int64) (rce bool) {
return
}
func (self *ClientManager) update(time int64) {
func (self *ClientManager) update(time mclock.AbsTime) {
for {
firstTime := time
for node, _ := range self.nodes {
@ -172,7 +173,7 @@ func (self *ClientManager) queueProc() {
for {
time.Sleep(time.Millisecond * 10)
self.lock.Lock()
self.update(getTime())
self.update(mclock.Now())
cs := self.canStartReq()
self.lock.Unlock()
if cs {
@ -183,7 +184,7 @@ func (self *ClientManager) queueProc() {
}
}
func (self *ClientManager) accept(node *cmNode, time int64) bool {
func (self *ClientManager) accept(node *cmNode, time mclock.AbsTime) bool {
self.lock.Lock()
defer self.lock.Unlock()
@ -205,7 +206,7 @@ func (self *ClientManager) accept(node *cmNode, time int64) bool {
return true
}
func (self *ClientManager) stop(node *cmNode, time int64) {
func (self *ClientManager) stop(node *cmNode, time mclock.AbsTime) {
if node.serving {
self.update(time)
self.simReqCnt--
@ -214,7 +215,7 @@ func (self *ClientManager) stop(node *cmNode, time int64) {
}
}
func (self *ClientManager) processed(node *cmNode, time int64) (rcValue, rcCost uint64) {
func (self *ClientManager) processed(node *cmNode, time mclock.AbsTime) (rcValue, rcCost uint64) {
self.lock.Lock()
defer self.lock.Unlock()

69
les/handler.go
View File

@ -24,6 +24,7 @@ import (
"math/big"
"net"
"sync"
"time"
"github.com/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/core"
@ -228,6 +229,12 @@ func (pm *ProtocolManager) removePeer(id string) {
if peer == nil {
return
}
if err := pm.peers.Unregister(id); err != nil {
if err == errNotRegistered {
return
}
glog.V(logger.Error).Infoln("Removal failed:", err)
}
glog.V(logger.Debug).Infoln("Removing peer", id)
// Unregister the peer from the downloader and Ethereum peer set
@ -241,9 +248,6 @@ func (pm *ProtocolManager) removePeer(id string) {
pm.fetcher.removePeer(peer)
}
}
if err := pm.peers.Unregister(id); err != nil {
glog.V(logger.Error).Infoln("Removal failed:", err)
}
// Hard disconnect at the networking layer
if peer != nil {
peer.Peer.Disconnect(p2p.DiscUselessPeer)
@ -340,12 +344,14 @@ func (pm *ProtocolManager) handle(p *peer) error {
requestHeadersByHash := func(origin common.Hash, amount int, skip int, reverse bool) error {
reqID := getNextReqID()
cost := p.GetRequestCost(GetBlockHeadersMsg, amount)
p.fcServer.MustAssignRequest(reqID)
p.fcServer.SendRequest(reqID, cost)
return p.RequestHeadersByHash(reqID, cost, origin, amount, skip, reverse)
}
requestHeadersByNumber := func(origin uint64, amount int, skip int, reverse bool) error {
reqID := getNextReqID()
cost := p.GetRequestCost(GetBlockHeadersMsg, amount)
p.fcServer.MustAssignRequest(reqID)
p.fcServer.SendRequest(reqID, cost)
return p.RequestHeadersByNumber(reqID, cost, origin, amount, skip, reverse)
}
@ -404,26 +410,23 @@ func (pm *ProtocolManager) handleMsg(p *peer) error {
return err
}
var costs *requestCosts
var reqCnt, maxReqs int
glog.V(logger.Debug).Infoln("msg:", msg.Code, msg.Size)
if rc, ok := p.fcCosts[msg.Code]; ok { // check if msg is a supported request type
costs = rc
if p.fcClient == nil {
return errResp(ErrRequestRejected, "")
costs := p.fcCosts[msg.Code]
reject := func(reqCnt, maxCnt uint64) bool {
if p.fcClient == nil || reqCnt > maxCnt {
return true
}
bv, ok := p.fcClient.AcceptRequest()
if !ok || bv < costs.baseCost {
return errResp(ErrRequestRejected, "")
bufValue, _ := p.fcClient.AcceptRequest()
cost := costs.baseCost + reqCnt*costs.reqCost
if cost > pm.server.defParams.BufLimit {
cost = pm.server.defParams.BufLimit
}
maxReqs = 10000
if bv < pm.server.defParams.BufLimit {
d := bv - costs.baseCost
if d/10000 < costs.reqCost {
maxReqs = int(d / costs.reqCost)
}
if cost > bufValue {
glog.V(logger.Error).Infof("Request from %v came %v too early", p.id, time.Duration((cost-bufValue)*1000000/pm.server.defParams.MinRecharge))
return true
}
return false
}
if msg.Size > ProtocolMaxMsgSize {
@ -450,7 +453,7 @@ func (pm *ProtocolManager) handleMsg(p *peer) error {
}
glog.V(logger.Detail).Infoln("AnnounceMsg:", req.Number, req.Hash, req.Td, req.ReorgDepth)
if pm.fetcher != nil {
go pm.fetcher.announce(p, &req)
pm.fetcher.announce(p, &req)
}
case GetBlockHeadersMsg:
@ -465,7 +468,7 @@ func (pm *ProtocolManager) handleMsg(p *peer) error {
}
query := req.Query
if query.Amount > uint64(maxReqs) || query.Amount > MaxHeaderFetch {
if reject(query.Amount, MaxHeaderFetch) {
return errResp(ErrRequestRejected, "")
}
@ -573,8 +576,8 @@ func (pm *ProtocolManager) handleMsg(p *peer) error {
bytes int
bodies []rlp.RawValue
)
reqCnt = len(req.Hashes)
if reqCnt > maxReqs || reqCnt > MaxBodyFetch {
reqCnt := len(req.Hashes)
if reject(uint64(reqCnt), MaxBodyFetch) {
return errResp(ErrRequestRejected, "")
}
for _, hash := range req.Hashes {
@ -627,8 +630,8 @@ func (pm *ProtocolManager) handleMsg(p *peer) error {
bytes int
data [][]byte
)
reqCnt = len(req.Reqs)
if reqCnt > maxReqs || reqCnt > MaxCodeFetch {
reqCnt := len(req.Reqs)
if reject(uint64(reqCnt), MaxCodeFetch) {
return errResp(ErrRequestRejected, "")
}
for _, req := range req.Reqs {
@ -688,8 +691,8 @@ func (pm *ProtocolManager) handleMsg(p *peer) error {
bytes int
receipts []rlp.RawValue
)
reqCnt = len(req.Hashes)
if reqCnt > maxReqs || reqCnt > MaxReceiptFetch {
reqCnt := len(req.Hashes)
if reject(uint64(reqCnt), MaxReceiptFetch) {
return errResp(ErrRequestRejected, "")
}
for _, hash := range req.Hashes {
@ -751,8 +754,8 @@ func (pm *ProtocolManager) handleMsg(p *peer) error {
bytes int
proofs proofsData
)
reqCnt = len(req.Reqs)
if reqCnt > maxReqs || reqCnt > MaxProofsFetch {
reqCnt := len(req.Reqs)
if reject(uint64(reqCnt), MaxProofsFetch) {
return errResp(ErrRequestRejected, "")
}
for _, req := range req.Reqs {
@ -818,8 +821,8 @@ func (pm *ProtocolManager) handleMsg(p *peer) error {
bytes int
proofs []ChtResp
)
reqCnt = len(req.Reqs)
if reqCnt > maxReqs || reqCnt > MaxHeaderProofsFetch {
reqCnt := len(req.Reqs)
if reject(uint64(reqCnt), MaxHeaderProofsFetch) {
return errResp(ErrRequestRejected, "")
}
for _, req := range req.Reqs {
@ -872,8 +875,8 @@ func (pm *ProtocolManager) handleMsg(p *peer) error {
if err := msg.Decode(&txs); err != nil {
return errResp(ErrDecode, "msg %v: %v", msg, err)
}
reqCnt = len(txs)
if reqCnt > maxReqs || reqCnt > MaxTxSend {
reqCnt := len(txs)
if reject(uint64(reqCnt), MaxTxSend) {
return errResp(ErrRequestRejected, "")
}

19
les/helper_test.go
View File

@ -336,10 +336,23 @@ func (p *testPeer) close() {
p.app.Close()
}
type testServerPool peer
type testServerPool struct {
peer *peer
lock sync.RWMutex
}
func (p *testServerPool) selectPeer(func(*peer) (bool, uint64)) *peer {
return (*peer)(p)
func (p *testServerPool) setPeer(peer *peer) {
p.lock.Lock()
defer p.lock.Unlock()
p.peer = peer
}
func (p *testServerPool) selectPeerWait(uint64, func(*peer) (bool, time.Duration), <-chan struct{}) *peer {
p.lock.RLock()
defer p.lock.RUnlock()
return p.peer
}
func (p *testServerPool) adjustResponseTime(*poolEntry, time.Duration, bool) {

10
les/odr.go
View File

@ -40,7 +40,7 @@ var (
type peerDropFn func(id string)
type odrPeerSelector interface {
selectPeer(func(*peer) (bool, uint64)) *peer
selectPeerWait(uint64, func(*peer) (bool, time.Duration), <-chan struct{}) *peer
adjustResponseTime(*poolEntry, time.Duration, bool)
}
@ -116,6 +116,7 @@ func (self *LesOdr) Deliver(peer *peer, msg *Msg) error {
if req.valFunc(self.db, msg) {
close(delivered)
req.lock.Lock()
delete(req.sentTo, peer)
if req.answered != nil {
close(req.answered)
req.answered = nil
@ -150,6 +151,7 @@ func (self *LesOdr) requestPeer(req *sentReq, peer *peer, delivered, timeout cha
select {
case <-delivered:
case <-time.After(hardRequestTimeout):
glog.V(logger.Debug).Infof("ODR hard request timeout from peer %v", peer.id)
go self.removePeer(peer.id)
case <-self.stop:
return
@ -187,12 +189,12 @@ func (self *LesOdr) networkRequest(ctx context.Context, lreq LesOdrRequest) erro
for {
var p *peer
if self.serverPool != nil {
p = self.serverPool.selectPeer(func(p *peer) (bool, uint64) {
if !lreq.CanSend(p) {
p = self.serverPool.selectPeerWait(reqID, func(p *peer) (bool, time.Duration) {
if _, ok := exclude[p]; ok || !lreq.CanSend(p) {
return false, 0
}
return true, p.fcServer.CanSend(lreq.GetCost(p))
})
}, ctx.Done())
}
if p == nil {
select {

9
les/odr_test.go
View File

@ -160,7 +160,8 @@ func testOdr(t *testing.T, protocol int, expFail uint64, fn odrTestFn) {
pm, db, odr := newTestProtocolManagerMust(t, false, 4, testChainGen)
lpm, ldb, odr := newTestProtocolManagerMust(t, true, 0, nil)
_, err1, lpeer, err2 := newTestPeerPair("peer", protocol, pm, lpm)
pool := (*testServerPool)(lpeer)
pool := &testServerPool{}
pool.setPeer(lpeer)
odr.serverPool = pool
select {
case <-time.After(time.Millisecond * 100):
@ -190,13 +191,13 @@ func testOdr(t *testing.T, protocol int, expFail uint64, fn odrTestFn) {
}
// temporarily remove peer to test odr fails
odr.serverPool = nil
pool.setPeer(nil)
// expect retrievals to fail (except genesis block) without a les peer
test(expFail)
odr.serverPool = pool
pool.setPeer(lpeer)
// expect all retrievals to pass
test(5)
odr.serverPool = nil
pool.setPeer(nil)
// still expect all retrievals to pass, now data should be cached locally
test(5)
}

4
les/peer.go
View File

@ -241,7 +241,9 @@ func (p *peer) RequestHeaderProofs(reqID, cost uint64, reqs []*ChtReq) error {
func (p *peer) SendTxs(cost uint64, txs types.Transactions) error {
glog.V(logger.Debug).Infof("%v relaying %v txs", p, len(txs))
p.fcServer.SendRequest(0, cost)
reqID := getNextReqID()
p.fcServer.MustAssignRequest(reqID)
p.fcServer.SendRequest(reqID, cost)
return p2p.Send(p.rw, SendTxMsg, txs)
}

7
les/request_test.go
View File

@ -71,7 +71,8 @@ func testAccess(t *testing.T, protocol int, fn accessTestFn) {
pm, db, _ := newTestProtocolManagerMust(t, false, 4, testChainGen)
lpm, ldb, odr := newTestProtocolManagerMust(t, true, 0, nil)
_, err1, lpeer, err2 := newTestPeerPair("peer", protocol, pm, lpm)
pool := (*testServerPool)(lpeer)
pool := &testServerPool{}
pool.setPeer(lpeer)
odr.serverPool = pool
select {
case <-time.After(time.Millisecond * 100):
@ -102,10 +103,10 @@ func testAccess(t *testing.T, protocol int, fn accessTestFn) {
}
// temporarily remove peer to test odr fails
odr.serverPool = nil
pool.setPeer(nil)
// expect retrievals to fail (except genesis block) without a les peer
test(0)
odr.serverPool = pool
pool.setPeer(lpeer)
// expect all retrievals to pass
test(5)
}

66
les/serverpool.go
View File

@ -265,33 +265,77 @@ func (pool *serverPool) adjustResponseTime(entry *poolEntry, time time.Duration,
type selectPeerItem struct {
peer *peer
weight int64
wait time.Duration
}
func (sp selectPeerItem) Weight() int64 {
return sp.weight
}
// selectPeer selects a suitable peer for a request
func (pool *serverPool) selectPeer(canSend func(*peer) (bool, uint64)) *peer {
// selectPeer selects a suitable peer for a request, also returning a necessary waiting time to perform the request
// and a "locked" flag meaning that the request has been assigned to the given peer and its execution is guaranteed
// after the given waiting time. If locked flag is false, selectPeer should be called again after the waiting time.
func (pool *serverPool) selectPeer(reqID uint64, canSend func(*peer) (bool, time.Duration)) (*peer, time.Duration, bool) {
pool.lock.Lock()
defer pool.lock.Unlock()
type selectPeer struct {
peer *peer
rstat, tstat float64
}
var list []selectPeer
sel := newWeightedRandomSelect()
for _, entry := range pool.entries {
if entry.state == psRegistered {
p := entry.peer
ok, cost := canSend(p)
if ok {
w := int64(1000000000 * (peerSelectMinWeight + math.Exp(-(entry.responseStats.recentAvg()+float64(cost))/float64(responseScoreTC))*math.Pow((1-entry.timeoutStats.recentAvg()), timeoutPow)))
sel.update(selectPeerItem{peer: p, weight: w})
if !entry.peer.fcServer.IsAssigned() {
list = append(list, selectPeer{entry.peer, entry.responseStats.recentAvg(), entry.timeoutStats.recentAvg()})
}
}
}
pool.lock.Unlock()
for _, sp := range list {
ok, wait := canSend(sp.peer)
if ok {
w := int64(1000000000 * (peerSelectMinWeight + math.Exp(-(sp.rstat+float64(wait))/float64(responseScoreTC))*math.Pow((1-sp.tstat), timeoutPow)))
sel.update(selectPeerItem{peer: sp.peer, weight: w, wait: wait})
}
}
choice := sel.choose()
if choice == nil {
return nil
return nil, 0, false
}
peer, wait := choice.(selectPeerItem).peer, choice.(selectPeerItem).wait
locked := false
if wait < time.Millisecond*100 {
if peer.fcServer.AssignRequest(reqID) {
ok, w := canSend(peer)
wait = time.Duration(w)
if ok && wait < time.Millisecond*100 {
locked = true
} else {
peer.fcServer.DeassignRequest(reqID)
wait = time.Millisecond * 100
}
}
} else {
wait = time.Millisecond * 100
}
return peer, wait, locked
}
// selectPeer selects a suitable peer for a request, waiting until an assignment to
// the request is guaranteed or the process is aborted.
func (pool *serverPool) selectPeerWait(reqID uint64, canSend func(*peer) (bool, time.Duration), abort <-chan struct{}) *peer {
for {
peer, wait, locked := pool.selectPeer(reqID, canSend)
if locked {
return peer
}
select {
case <-abort:
return nil
case <-time.After(wait):
}
}
return choice.(selectPeerItem).peer
}
// eventLoop handles pool events and mutex locking for all internal functions