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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,58 +1,25 @@ | ||
| package peerstore | ||
|
|
||
| import ( | ||
| "sync" | ||
| "time" | ||
|
|
||
| "github.com/libp2p/go-libp2p-core/peer" | ||
| "github.com/libp2p/go-libp2p/core/peer" | ||
| "github.com/libp2p/go-libp2p/p2p/host/peerstore" | ||
| ) | ||
|
|
||
| // LatencyEWMASmoothing governs the decay of the EWMA (the speed | ||
| // at which it changes). This must be a normalized (0-1) value. | ||
| // 1 is 100% change, 0 is no change. | ||
| var LatencyEWMASmoothing = 0.1 | ||
| // Deprecated: use github.com/libp2p/go-libp2p/p2p/host/peerstore.LatencyEWMASmoothing instead | ||
| var LatencyEWMASmoothing = peerstore.LatencyEWMASmoothing | ||
|
|
||
| type metrics struct { | ||
| mutex sync.RWMutex | ||
| latmap map[peer.ID]time.Duration | ||
| type metrics interface { | ||
| RecordLatency(peer.ID, time.Duration) | ||
| LatencyEWMA(peer.ID) time.Duration | ||
| RemovePeer(p peer.ID) | ||
| } | ||
|
|
||
| func NewMetrics() *metrics { | ||
| return &metrics{ | ||
| latmap: make(map[peer.ID]time.Duration), | ||
| } | ||
| } | ||
|
|
||
| // RecordLatency records a new latency measurement | ||
| func (m *metrics) RecordLatency(p peer.ID, next time.Duration) { | ||
| nextf := float64(next) | ||
| s := LatencyEWMASmoothing | ||
| if s > 1 || s < 0 { | ||
| s = 0.1 // ignore the knob. it's broken. look, it jiggles. | ||
| } | ||
|
|
||
| m.mutex.Lock() | ||
| ewma, found := m.latmap[p] | ||
| ewmaf := float64(ewma) | ||
| if !found { | ||
| m.latmap[p] = next // when no data, just take it as the mean. | ||
| } else { | ||
| nextf = ((1.0 - s) * ewmaf) + (s * nextf) | ||
| m.latmap[p] = time.Duration(nextf) | ||
| } | ||
| m.mutex.Unlock() | ||
| } | ||
|
|
||
| // LatencyEWMA returns an exponentially-weighted moving avg. | ||
| // of all measurements of a peer's latency. | ||
| func (m *metrics) LatencyEWMA(p peer.ID) time.Duration { | ||
| m.mutex.RLock() | ||
| defer m.mutex.RUnlock() | ||
| return m.latmap[p] | ||
| } | ||
|
|
||
| func (m *metrics) RemovePeer(p peer.ID) { | ||
| m.mutex.Lock() | ||
| delete(m.latmap, p) | ||
| m.mutex.Unlock() | ||
| // Deprecated: use github.com/libp2p/go-libp2p/p2p/host/peerstore.NewMetrics instead | ||
| func NewMetrics() metrics { | ||
| return peerstore.NewMetrics() | ||
| } |
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