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d5c180e680
It is better developing vmctl tool in VictoriaMetrics repository, so it could be released together with the rest of vmutils tools such as vmalert, vmagent, vmbackup, vmrestore and vmauth.
74 lines
2.3 KiB
Go
74 lines
2.3 KiB
Go
package models
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// Helper time methods since parsing time can easily overflow and we only support a
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// specific time range.
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import (
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"fmt"
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"math"
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"time"
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)
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const (
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// MinNanoTime is the minimum time that can be represented.
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//
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// 1677-09-21 00:12:43.145224194 +0000 UTC
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//
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// The two lowest minimum integers are used as sentinel values. The
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// minimum value needs to be used as a value lower than any other value for
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// comparisons and another separate value is needed to act as a sentinel
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// default value that is unusable by the user, but usable internally.
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// Because these two values need to be used for a special purpose, we do
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// not allow users to write points at these two times.
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MinNanoTime = int64(math.MinInt64) + 2
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// MaxNanoTime is the maximum time that can be represented.
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//
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// 2262-04-11 23:47:16.854775806 +0000 UTC
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//
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// The highest time represented by a nanosecond needs to be used for an
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// exclusive range in the shard group, so the maximum time needs to be one
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// less than the possible maximum number of nanoseconds representable by an
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// int64 so that we don't lose a point at that one time.
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MaxNanoTime = int64(math.MaxInt64) - 1
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)
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var (
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minNanoTime = time.Unix(0, MinNanoTime).UTC()
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maxNanoTime = time.Unix(0, MaxNanoTime).UTC()
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// ErrTimeOutOfRange gets returned when time is out of the representable range using int64 nanoseconds since the epoch.
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ErrTimeOutOfRange = fmt.Errorf("time outside range %d - %d", MinNanoTime, MaxNanoTime)
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)
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// SafeCalcTime safely calculates the time given. Will return error if the time is outside the
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// supported range.
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func SafeCalcTime(timestamp int64, precision string) (time.Time, error) {
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mult := GetPrecisionMultiplier(precision)
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if t, ok := safeSignedMult(timestamp, mult); ok {
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tme := time.Unix(0, t).UTC()
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return tme, CheckTime(tme)
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}
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return time.Time{}, ErrTimeOutOfRange
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}
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// CheckTime checks that a time is within the safe range.
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func CheckTime(t time.Time) error {
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if t.Before(minNanoTime) || t.After(maxNanoTime) {
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return ErrTimeOutOfRange
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}
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return nil
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}
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// Perform the multiplication and check to make sure it didn't overflow.
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func safeSignedMult(a, b int64) (int64, bool) {
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if a == 0 || b == 0 || a == 1 || b == 1 {
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return a * b, true
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}
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if a == MinNanoTime || b == MaxNanoTime {
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return 0, false
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}
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c := a * b
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return c, c/b == a
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}
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