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037fd9cc8c
* loki: alerting: adjust step-calculation to be the same as in frontend * loki: simplified test * lint fix
32 lines
747 B
Go
32 lines
747 B
Go
package loki
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import (
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"math"
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"time"
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)
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// round the duration to the nearest millisecond larger-or-equal-to the duration
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func ceilMs(duration time.Duration) time.Duration {
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floatMs := float64(duration.Nanoseconds()) / 1000.0 / 1000.0
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ceilMs := math.Ceil(floatMs)
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return time.Duration(ceilMs) * time.Millisecond
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}
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func durationMax(d1 time.Duration, d2 time.Duration) time.Duration {
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if d1.Nanoseconds() >= d2.Nanoseconds() {
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return d1
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} else {
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return d2
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}
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}
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func calculateStep(baseInterval time.Duration, timeRange time.Duration, resolution int64) time.Duration {
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step := time.Duration(baseInterval.Nanoseconds() * resolution)
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safeStep := timeRange / 11000
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chosenStep := durationMax(step, safeStep)
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return ceilMs(chosenStep)
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}
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