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58 lines
1.3 KiB
58 lines
1.3 KiB
package time
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import (
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"sort"
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"time"
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)
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// Now returns the current time in UTC with no monotonic component.
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func Now() time.Time {
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return Canonical(time.Now())
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}
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// Canonical returns UTC time with no monotonic component.
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// Stripping the monotonic component is for time equality.
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// See https://github.com/tendermint/tendermint/pull/2203#discussion_r215064334
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func Canonical(t time.Time) time.Time {
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return t.Round(0).UTC()
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}
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// WeightedTime for computing a median.
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type WeightedTime struct {
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Time time.Time
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Weight int64
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}
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// NewWeightedTime with time and weight.
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func NewWeightedTime(time time.Time, weight int64) *WeightedTime {
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return &WeightedTime{
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Time: time,
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Weight: weight,
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}
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}
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// WeightedMedian computes weighted median time for a given array of WeightedTime and the total voting power.
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func WeightedMedian(weightedTimes []*WeightedTime, totalVotingPower int64) (res time.Time) {
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median := totalVotingPower / 2
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sort.Slice(weightedTimes, func(i, j int) bool {
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if weightedTimes[i] == nil {
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return false
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}
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if weightedTimes[j] == nil {
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return true
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}
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return weightedTimes[i].Time.UnixNano() < weightedTimes[j].Time.UnixNano()
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})
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for _, weightedTime := range weightedTimes {
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if weightedTime != nil {
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if median <= weightedTime.Weight {
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res = weightedTime.Time
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break
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}
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median -= weightedTime.Weight
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}
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}
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return
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}
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