120 lines
3.0 KiB
Go
120 lines
3.0 KiB
Go
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// Copyright 2015 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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"sync"
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)
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const dropTimeoutRatio = 20
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type odrPeerInfo struct {
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reqTimeSum, reqTimeCnt, reqCnt, timeoutCnt uint64
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}
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// odrPeerSet represents the collection of active peer participating in the block
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// download procedure.
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type odrPeerSet struct {
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peers map[*peer]*odrPeerInfo
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lock sync.RWMutex
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}
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// newPeerSet creates a new peer set top track the active download sources.
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func newOdrPeerSet() *odrPeerSet {
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return &odrPeerSet{
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peers: make(map[*peer]*odrPeerInfo),
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}
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}
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// Register injects a new peer into the working set, or returns an error if the
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// peer is already known.
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func (ps *odrPeerSet) register(p *peer) error {
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ps.lock.Lock()
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defer ps.lock.Unlock()
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if _, ok := ps.peers[p]; ok {
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return errAlreadyRegistered
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}
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ps.peers[p] = &odrPeerInfo{}
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return nil
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}
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// Unregister removes a remote peer from the active set, disabling any further
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// actions to/from that particular entity.
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func (ps *odrPeerSet) unregister(p *peer) error {
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ps.lock.Lock()
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defer ps.lock.Unlock()
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if _, ok := ps.peers[p]; !ok {
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return errNotRegistered
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}
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delete(ps.peers, p)
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return nil
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}
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func (ps *odrPeerSet) peerPriority(p *peer, info *odrPeerInfo, req LesOdrRequest) uint64 {
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tm := p.fcServer.CanSend(req.GetCost(p))
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if info.reqTimeCnt > 0 {
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tm += info.reqTimeSum / info.reqTimeCnt
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}
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return tm
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}
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func (ps *odrPeerSet) bestPeer(req LesOdrRequest, exclude map[*peer]struct{}) *peer {
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var best *peer
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var bpv uint64
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ps.lock.Lock()
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defer ps.lock.Unlock()
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for p, info := range ps.peers {
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if _, ok := exclude[p]; !ok {
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pv := ps.peerPriority(p, info, req)
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if best == nil || pv < bpv {
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best = p
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bpv = pv
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}
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}
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}
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return best
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}
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func (ps *odrPeerSet) updateTimeout(p *peer, timeout bool) (drop bool) {
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ps.lock.Lock()
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defer ps.lock.Unlock()
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if info, ok := ps.peers[p]; ok {
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info.reqCnt++
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if timeout {
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// check ratio before increase to allow an extra timeout
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if info.timeoutCnt*dropTimeoutRatio >= info.reqCnt {
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return true
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}
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info.timeoutCnt++
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}
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}
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return false
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}
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func (ps *odrPeerSet) updateServTime(p *peer, servTime uint64) {
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ps.lock.Lock()
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defer ps.lock.Unlock()
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if info, ok := ps.peers[p]; ok {
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info.reqTimeSum += servTime
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info.reqTimeCnt++
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}
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}
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