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gtime: Make ParseInterval deterministic (#32539)

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* gtime: Make ParseInterval deterministic by using UTC timezone

Signed-off-by: Arve Knudsen <arve.knudsen@gmail.com>
This commit is contained in:
Arve Knudsen 2021-03-31 16:44:23 +02:00 committed by GitHub
parent aad43869c3
commit 6730558f8c
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GPG Key ID: 4AEE18F83AFDEB23
2 changed files with 14 additions and 14 deletions
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14
pkg/components/gtime/gtime.go
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@ -10,7 +10,7 @@ import (
var dateUnitPattern = regexp.MustCompile(`^(\d+)([dwMy])$`)
// ParseInterval parses an interval with support for all units that Grafana uses.
// An interval is relative the current wall time.
// An interval is relative to the current wall time.
func ParseInterval(inp string) (time.Duration, error) {
dur, period, err := parse(inp)
if err != nil {
@ -22,16 +22,18 @@ func ParseInterval(inp string) (time.Duration, error) {
num := int(dur)
now := time.Now()
// Use UTC to ensure that the interval is deterministic, and daylight saving
// doesn't cause surprises
now := time.Now().UTC()
switch period {
case "d":
return now.Sub(now.AddDate(0, 0, -num)), nil
return now.AddDate(0, 0, num).Sub(now), nil
case "w":
return now.Sub(now.AddDate(0, 0, -num*7)), nil
return now.AddDate(0, 0, num*7).Sub(now), nil
case "M":
return now.Sub(now.AddDate(0, -num, 0)), nil
return now.AddDate(0, num, 0).Sub(now), nil
case "y":
return now.Sub(now.AddDate(-num, 0, 0)), nil
return now.AddDate(num, 0, 0).Sub(now), nil
}
return 0, fmt.Errorf("invalid interval %q", inp)

14
pkg/components/gtime/gtime_test.go
View File

@ -10,19 +10,17 @@ import (
)
func TestParseInterval(t *testing.T) {
now := time.Now()
tcs := []struct {
inp string
duration time.Duration
err *regexp.Regexp
}{
{inp: "1d", duration: now.Sub(now.AddDate(0, 0, -1))},
{inp: "1w", duration: now.Sub(now.AddDate(0, 0, -7))},
{inp: "2w", duration: now.Sub(now.AddDate(0, 0, -14))},
{inp: "1M", duration: now.Sub(now.AddDate(0, -1, 0))},
{inp: "1y", duration: now.Sub(now.AddDate(-1, 0, 0))},
{inp: "5y", duration: now.Sub(now.AddDate(-5, 0, 0))},
{inp: "1d", duration: 24 * time.Hour},
{inp: "1w", duration: 168 * time.Hour},
{inp: "2w", duration: 2 * 168 * time.Hour},
{inp: "1M", duration: 744 * time.Hour},
{inp: "1y", duration: 8760 * time.Hour},
{inp: "5y", duration: 43824 * time.Hour},
{inp: "invalid-duration", err: regexp.MustCompile(`^time: invalid duration "?invalid-duration"?$`)},
}
for i, tc := range tcs {