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calculator.go
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calculator.go
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package timeline
// Heavily inspired by https://github.com/grafana/grafana/blob/bc11a484ed97d9c87e8dd42347c2c34713e9e441/pkg/tsdb/intervalv2/intervalv2.go#L1
import (
"time"
)
var (
DefaultRes int64 = 1500
DefaultMinInterval = time.Second * 10
)
// CalcPointInterval calculates the appropriate interval between each point (aka step)
// Note that its main usage is with SelectSeries, therefore its
// * inputs are in ms
// * output is in seconds
func CalcPointInterval(fromMs int64, untilMs int64) float64 {
resolution := DefaultRes
fromNano := fromMs * 1000000
untilNano := untilMs * 1000000
calculatedIntervalNano := time.Duration((untilNano - fromNano) / resolution)
if calculatedIntervalNano < DefaultMinInterval {
return DefaultMinInterval.Seconds()
}
return roundInterval(calculatedIntervalNano).Seconds()
}
//nolint:gocyclo
func roundInterval(interval time.Duration) time.Duration {
// Notice that interval may be smaller than DefaultMinInterval, and therefore some branches may never be reached
// These branches are left in case the invariant changes
switch {
// 0.01s
case interval <= 10*time.Millisecond:
return time.Millisecond * 1 // 0.001s
// 0.015s
case interval <= 15*time.Millisecond:
return time.Millisecond * 10 // 0.01s
// 0.035s
case interval <= 35*time.Millisecond:
return time.Millisecond * 20 // 0.02s
// 0.075s
case interval <= 75*time.Millisecond:
return time.Millisecond * 50 // 0.05s
// 0.15s
case interval <= 150*time.Millisecond:
return time.Millisecond * 100 // 0.1s
// 0.35s
case interval <= 350*time.Millisecond:
return time.Millisecond * 200 // 0.2s
// 0.75s
case interval <= 750*time.Millisecond:
return time.Millisecond * 500 // 0.5s
// 1.5s
case interval <= 1500*time.Millisecond:
return time.Millisecond * 1000 // 1s
// 3.5s
case interval <= 3500*time.Millisecond:
return time.Millisecond * 2000 // 2s
// 7.5s
case interval <= 7500*time.Millisecond:
return time.Millisecond * 5000 // 5s
// 12.5s
case interval <= 12500*time.Millisecond:
return time.Millisecond * 10000 // 10s
// 17.5s
case interval <= 17500*time.Millisecond:
return time.Millisecond * 15000 // 15s
// 25s
case interval <= 25000*time.Millisecond:
return time.Millisecond * 20000 // 20s
// 45s
case interval <= 45000*time.Millisecond:
return time.Millisecond * 30000 // 30s
// 1.5m
case interval <= 90000*time.Millisecond:
return time.Millisecond * 60000 // 1m
// 3.5m
case interval <= 210000*time.Millisecond:
return time.Millisecond * 120000 // 2m
// 7.5m
case interval <= 450000*time.Millisecond:
return time.Millisecond * 300000 // 5m
// 12.5m
case interval <= 750000*time.Millisecond:
return time.Millisecond * 600000 // 10m
// 17.5m
case interval <= 1050000*time.Millisecond:
return time.Millisecond * 900000 // 15m
// 25m
case interval <= 1500000*time.Millisecond:
return time.Millisecond * 1200000 // 20m
// 45m
case interval <= 2700000*time.Millisecond:
return time.Millisecond * 1800000 // 30m
// 1.5h
case interval <= 5400000*time.Millisecond:
return time.Millisecond * 3600000 // 1h
// 2.5h
case interval <= 9000000*time.Millisecond:
return time.Millisecond * 7200000 // 2h
// 4.5h
case interval <= 16200000*time.Millisecond:
return time.Millisecond * 10800000 // 3h
// 9h
case interval <= 32400000*time.Millisecond:
return time.Millisecond * 21600000 // 6h
// 24h
case interval <= 86400000*time.Millisecond:
return time.Millisecond * 43200000 // 12h
// 48h
case interval <= 172800000*time.Millisecond:
return time.Millisecond * 86400000 // 24h
// 1w
case interval <= 604800000*time.Millisecond:
return time.Millisecond * 86400000 // 24h
// 3w
case interval <= 1814400000*time.Millisecond:
return time.Millisecond * 604800000 // 1w
// 2y
case interval < 3628800000*time.Millisecond:
return time.Millisecond * 2592000000 // 30d
default:
return time.Millisecond * 31536000000 // 1y
}
}