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ae12ac69ba
This allows removing importing unneeded command-line flags into binaries, which import lib/storage,
which, in turn, was importing lib/snapshot in order to use Time, Validate and NewName functions.
This is a follow-up for 83e55456e2
Updates https://github.com/VictoriaMetrics/VictoriaMetrics/pull/5738
47 lines
1.3 KiB
Go
47 lines
1.3 KiB
Go
package snapshotutil
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import (
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"fmt"
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"regexp"
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"strings"
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"sync/atomic"
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"time"
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"github.com/VictoriaMetrics/VictoriaMetrics/lib/logger"
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)
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var snapshotNameRegexp = regexp.MustCompile(`^[0-9]{14}-[0-9A-Fa-f]+$`)
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// Validate validates the snapshotName
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func Validate(snapshotName string) error {
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_, err := Time(snapshotName)
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return err
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}
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// Time returns snapshot creation time from the given snapshotName
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func Time(snapshotName string) (time.Time, error) {
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if !snapshotNameRegexp.MatchString(snapshotName) {
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return time.Time{}, fmt.Errorf("unexpected snapshot name=%q; it must match %q regexp", snapshotName, snapshotNameRegexp.String())
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}
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n := strings.IndexByte(snapshotName, '-')
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if n < 0 {
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logger.Panicf("BUG: cannot find `-` in snapshotName=%q", snapshotName)
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}
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s := snapshotName[:n]
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t, err := time.Parse("20060102150405", s)
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if err != nil {
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return time.Time{}, fmt.Errorf("unexpected timestamp=%q in snapshot name: %w; it must match YYYYMMDDhhmmss pattern", s, err)
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}
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return t, nil
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}
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// NewName returns new name for new snapshot
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func NewName() string {
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return fmt.Sprintf("%s-%08X", time.Now().UTC().Format("20060102150405"), nextSnapshotIdx())
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}
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func nextSnapshotIdx() uint64 {
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return atomic.AddUint64(&snapshotIdx, 1)
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}
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var snapshotIdx = uint64(time.Now().UnixNano())
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