forked from filecoin-project/lotus
/
peer_tracker.go
195 lines (158 loc) · 4.03 KB
/
peer_tracker.go
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
package exchange
// FIXME: This needs to be reviewed.
import (
"context"
"sort"
"sync"
"time"
"github.com/libp2p/go-libp2p/core/host"
"github.com/libp2p/go-libp2p/core/peer"
"go.uber.org/fx"
"github.com/filecoin-project/lotus/build"
"github.com/filecoin-project/lotus/lib/peermgr"
)
type peerStats struct {
successes int
failures int
firstSeen time.Time
averageTime time.Duration
}
type bsPeerTracker struct {
lk sync.Mutex
peers map[peer.ID]*peerStats
avgGlobalTime time.Duration
pmgr *peermgr.PeerMgr
}
func newPeerTracker(lc fx.Lifecycle, h host.Host, pmgr *peermgr.PeerMgr) *bsPeerTracker {
bsPt := &bsPeerTracker{
peers: make(map[peer.ID]*peerStats),
pmgr: pmgr,
}
evtSub, err := h.EventBus().Subscribe(new(peermgr.FilPeerEvt))
if err != nil {
panic(err)
}
go func() {
for evt := range evtSub.Out() {
pEvt := evt.(peermgr.FilPeerEvt)
switch pEvt.Type {
case peermgr.AddFilPeerEvt:
bsPt.addPeer(pEvt.ID)
case peermgr.RemoveFilPeerEvt:
bsPt.removePeer(pEvt.ID)
}
}
}()
lc.Append(fx.Hook{
OnStop: func(ctx context.Context) error {
return evtSub.Close()
},
})
return bsPt
}
func (bpt *bsPeerTracker) addPeer(p peer.ID) {
bpt.lk.Lock()
defer bpt.lk.Unlock()
if _, ok := bpt.peers[p]; ok {
return
}
bpt.peers[p] = &peerStats{
firstSeen: build.Clock.Now(),
}
}
const (
// newPeerMul is how much better than average is the new peer assumed to be
// less than one to encourouge trying new peers
newPeerMul = 0.9
)
func (bpt *bsPeerTracker) prefSortedPeers() []peer.ID {
// TODO: this could probably be cached, but as long as its not too many peers, fine for now
bpt.lk.Lock()
defer bpt.lk.Unlock()
out := make([]peer.ID, 0, len(bpt.peers))
for p := range bpt.peers {
out = append(out, p)
}
// sort by 'expected cost' of requesting data from that peer
// additionally handle edge cases where not enough data is available
sort.Slice(out, func(i, j int) bool {
pi := bpt.peers[out[i]]
pj := bpt.peers[out[j]]
var costI, costJ float64
getPeerInitLat := func(p peer.ID) float64 {
return float64(bpt.avgGlobalTime) * newPeerMul
}
if pi.successes+pi.failures > 0 {
failRateI := float64(pi.failures) / float64(pi.failures+pi.successes)
costI = float64(pi.averageTime) + failRateI*float64(bpt.avgGlobalTime)
} else {
costI = getPeerInitLat(out[i])
}
if pj.successes+pj.failures > 0 {
failRateJ := float64(pj.failures) / float64(pj.failures+pj.successes)
costJ = float64(pj.averageTime) + failRateJ*float64(bpt.avgGlobalTime)
} else {
costJ = getPeerInitLat(out[j])
}
return costI < costJ
})
return out
}
const (
// xInvAlpha = (N+1)/2
localInvAlpha = 10 // 86% of the value is the last 19
globalInvAlpha = 25 // 86% of the value is the last 49
)
func (bpt *bsPeerTracker) logGlobalSuccess(dur time.Duration) {
bpt.lk.Lock()
defer bpt.lk.Unlock()
if bpt.avgGlobalTime == 0 {
bpt.avgGlobalTime = dur
return
}
delta := (dur - bpt.avgGlobalTime) / globalInvAlpha
bpt.avgGlobalTime += delta
}
func logTime(pi *peerStats, dur time.Duration) {
if pi.averageTime == 0 {
pi.averageTime = dur
return
}
delta := (dur - pi.averageTime) / localInvAlpha
pi.averageTime += delta
}
func (bpt *bsPeerTracker) logSuccess(p peer.ID, dur time.Duration, reqSize uint64) {
bpt.lk.Lock()
defer bpt.lk.Unlock()
var pi *peerStats
var ok bool
if pi, ok = bpt.peers[p]; !ok {
log.Warnw("log success called on peer not in tracker", "peerid", p.String())
return
}
pi.successes++
if reqSize == 0 {
reqSize = 1
}
logTime(pi, dur/time.Duration(reqSize))
}
func (bpt *bsPeerTracker) logFailure(p peer.ID, dur time.Duration, reqSize uint64) {
bpt.lk.Lock()
defer bpt.lk.Unlock()
var pi *peerStats
var ok bool
if pi, ok = bpt.peers[p]; !ok {
log.Warn("log failure called on peer not in tracker", "peerid", p.String())
return
}
pi.failures++
if reqSize == 0 {
reqSize = 1
}
logTime(pi, dur/time.Duration(reqSize))
}
func (bpt *bsPeerTracker) removePeer(p peer.ID) {
bpt.lk.Lock()
defer bpt.lk.Unlock()
delete(bpt.peers, p)
}