mirror of
https://github.com/status-im/status-go.git
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eeca435064
Update vendor Integrate rendezvous into status node Add a test with failover using rendezvous Use multiple servers in client Use discovery V5 by default and test that node can be started with rendezvous discovet Fix linter Update rendezvous client to one with instrumented stream Address feedback Fix test with updated topic limits Apply several suggestions Change log to debug for request errors because we continue execution Remove web3js after rebase Update rendezvous package
66 lines
1.5 KiB
Go
66 lines
1.5 KiB
Go
package peerstore
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import (
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"sync"
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"time"
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"github.com/libp2p/go-libp2p-peer"
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)
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// LatencyEWMASmooting governs the decay of the EWMA (the speed
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// at which it changes). This must be a normalized (0-1) value.
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// 1 is 100% change, 0 is no change.
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var LatencyEWMASmoothing = 0.1
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// Metrics is just an object that tracks metrics
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// across a set of peers.
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type Metrics interface {
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// RecordLatency records a new latency measurement
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RecordLatency(peer.ID, time.Duration)
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// LatencyEWMA returns an exponentially-weighted moving avg.
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// of all measurements of a peer's latency.
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LatencyEWMA(peer.ID) time.Duration
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}
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type metrics struct {
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latmap map[peer.ID]time.Duration
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latmu sync.RWMutex
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}
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func NewMetrics() *metrics {
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return &metrics{
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latmap: make(map[peer.ID]time.Duration),
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}
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}
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// RecordLatency records a new latency measurement
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func (m *metrics) RecordLatency(p peer.ID, next time.Duration) {
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nextf := float64(next)
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s := LatencyEWMASmoothing
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if s > 1 || s < 0 {
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s = 0.1 // ignore the knob. it's broken. look, it jiggles.
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}
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m.latmu.Lock()
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ewma, found := m.latmap[p]
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ewmaf := float64(ewma)
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if !found {
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m.latmap[p] = next // when no data, just take it as the mean.
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} else {
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nextf = ((1.0 - s) * ewmaf) + (s * nextf)
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m.latmap[p] = time.Duration(nextf)
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}
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m.latmu.Unlock()
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}
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// LatencyEWMA returns an exponentially-weighted moving avg.
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// of all measurements of a peer's latency.
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func (m *metrics) LatencyEWMA(p peer.ID) time.Duration {
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m.latmu.RLock()
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lat := m.latmap[p]
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m.latmu.RUnlock()
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return time.Duration(lat)
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}
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