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https://github.com/livekit/livekit.git
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8ed193b231
* WIP commit * Add a probe cluster mode * better variable naming * fix units * WIP commit * WIP commit * WIP commit * new file * WIP commit * Maintain history of a few things * correct signal * fix typo * WIP commmit * gofmt * rate not sum * adjust edges of rate monitor * fmt * remove debug
106 lines
2.5 KiB
Go
106 lines
2.5 KiB
Go
package streamallocator
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import (
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"fmt"
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"time"
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"github.com/livekit/protocol/logger"
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)
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// ------------------------------------------------
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type NackTrackerParams struct {
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Name string
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Logger logger.Logger
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WindowMinDuration time.Duration
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WindowMaxDuration time.Duration
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RatioThreshold float64
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}
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type NackTracker struct {
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params NackTrackerParams
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windowStartTime time.Time
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packets uint32
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repeatedNacks uint32
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// STREAM-ALLOCATOR-EXPERIMENTAL-TODO: remove when cleaning up experimental stuff
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history []string
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}
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func NewNackTracker(params NackTrackerParams) *NackTracker {
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return &NackTracker{
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params: params,
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history: make([]string, 0, 10),
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}
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}
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func (n *NackTracker) Add(packets uint32, repeatedNacks uint32) {
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if n.params.WindowMaxDuration != 0 && !n.windowStartTime.IsZero() && time.Since(n.windowStartTime) > n.params.WindowMaxDuration {
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n.updateHistory()
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n.windowStartTime = time.Time{}
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n.packets = 0
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n.repeatedNacks = 0
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}
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//
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// Start NACK monitoring window only when a repeated NACK happens.
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// This allows locking tightly to when NACKs start happening and
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// check if the NACKs keep adding up (potentially a sign of congestion)
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// or isolated losses
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//
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if n.repeatedNacks == 0 && repeatedNacks != 0 {
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n.windowStartTime = time.Now()
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}
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if !n.windowStartTime.IsZero() {
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n.packets += packets
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n.repeatedNacks += repeatedNacks
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}
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}
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func (n *NackTracker) GetRatio() float64 {
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ratio := 0.0
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if n.packets != 0 {
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ratio = float64(n.repeatedNacks) / float64(n.packets)
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if ratio > 1.0 {
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ratio = 1.0
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}
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}
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return ratio
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}
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func (n *NackTracker) IsTriggered() bool {
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if n.params.WindowMinDuration != 0 && !n.windowStartTime.IsZero() && time.Since(n.windowStartTime) > n.params.WindowMinDuration {
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return n.GetRatio() > n.params.RatioThreshold
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}
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return false
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}
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func (n *NackTracker) ToString() string {
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window := ""
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if !n.windowStartTime.IsZero() {
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now := time.Now()
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elapsed := now.Sub(n.windowStartTime).Seconds()
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window = fmt.Sprintf("t: %+v|%+v|%.2fs", n.windowStartTime.Format(time.UnixDate), now.Format(time.UnixDate), elapsed)
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}
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return fmt.Sprintf("n: %s, %s, p: %d, rn: %d, rn/p: %.2f", n.params.Name, window, n.packets, n.repeatedNacks, n.GetRatio())
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}
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func (n *NackTracker) GetHistory() []string {
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return n.history
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}
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func (n *NackTracker) updateHistory() {
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if len(n.history) >= 10 {
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n.history = n.history[1:]
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}
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n.history = append(n.history, n.ToString())
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}
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// ------------------------------------------------
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