mirror of
https://github.com/owncast/owncast.git
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110 lines
2.2 KiB
Go
110 lines
2.2 KiB
Go
package utils
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import (
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"sort"
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"sync"
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"time"
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)
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var l = sync.Mutex{}
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// The "start" timestamp of a timing event.
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var _pointsInTime = make(map[string]time.Time)
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// A collection of timestamp durations for returning the average of.
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var _durationStorage = make(map[string][]float64)
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// StartPerformanceMonitor will keep track of the start time of this event.
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func StartPerformanceMonitor(key string) {
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l.Lock()
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if len(_durationStorage[key]) > 20 {
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_durationStorage[key] = removeHighValue(_durationStorage[key])
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}
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_pointsInTime[key] = time.Now()
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l.Unlock()
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}
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// GetAveragePerformance will return the average durations for the event.
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func GetAveragePerformance(key string) float64 {
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timestamp := _pointsInTime[key]
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if timestamp.IsZero() {
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return 0
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}
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l.Lock()
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defer l.Unlock()
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delta := time.Since(timestamp).Seconds()
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_durationStorage[key] = append(_durationStorage[key], delta)
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if len(_durationStorage[key]) < 8 {
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return 0
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}
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_durationStorage[key] = removeHighValue(_durationStorage[key])
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return Avg(_durationStorage[key])
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}
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func removeHighValue(values []float64) []float64 {
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sort.Float64s(values)
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return values[:len(values)-1]
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}
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// Avg will return the average value from a slice of float64s.
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func Avg(values []float64) float64 {
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total := 0.0
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for _, number := range values {
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total += number
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}
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average := total / float64(len(values))
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return average
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}
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// Sum returns the sum of a slice of values.
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func Sum(values []float64) float64 {
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total := 0.0
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for _, number := range values {
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total += number
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}
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return total
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}
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// MinMax will return the min and max values from a slice of float64s.
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func MinMax(array []float64) (float64, float64) {
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max := array[0]
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min := array[0]
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for _, value := range array {
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if max < value {
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max = value
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}
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if min > value {
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min = value
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}
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}
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return min, max
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}
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func mean(input []float64) float64 {
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sum := Sum(input)
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return sum / float64(len(input))
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}
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// Median gets the median number in a slice of numbers.
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func Median(input []float64) float64 {
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if len(input) == 1 {
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return input[0]
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}
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c := make([]float64, len(input))
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copy(c, input)
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var median float64
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l := len(c)
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if l%2 == 0 {
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median = mean(c[l/2-1 : l/2+1])
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} else {
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median = c[l/2]
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}
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return median
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}
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