Kronika adds some extra utility around the standard time package. It does not have any other external dependencies.
kronika.WaitUntil(ctx context.Context, t time.Time)WaitUntil will block until the given time. Unlike using time.After or time.Timer, it can be cancelled by cancelling the context.
kronika.WaitFor(ctx context.Context, diff time.Duration)WaitFor will block for the specified duration. Unlike using time.After or time.Timer, it can be cancelled by cancelling the context.
kronika.Every(ctx context.Context, start time.Time, interval time.Duration) <-chan time.Timekronika.Every() works like a cron job. It is supplied a start time, and an interval, and it will send the current time to the returned channel at the specified intervals. Again, it can always be cancelled using the context.
Here are some examples of using Every
ctx := context.Background()
start, err := time.Parse(
"2006-01-02 15:04:05",
"2019-09-17 14:00:00",
) // is a tuesday
if err != nil {
panic(err)
}
interval := time.Hour * 24 * 7 // 1 week
for t := range kronika.Every(ctx, start, interval) {
// Perform action here
log.Println(t.Format("2006-01-02 15:04:05"))
}ctx := context.Background()
start, err := time.Parse(
"2006-01-02 15:04:05",
"2019-09-17 14:00:00",
) // any time in the past works but it should be on the hour
if err != nil {
panic(err)
}
interval := time.Hour // 1 hour
for t := range kronika.Every(ctx, start, interval) {
// Perform action here
log.Println(t.Format("2006-01-02 15:04:05"))
}ctx := context.Background()
// see https://golang.org/pkg/time/#Time.AddDate
start, err := time.Now().AddDate(0, 0, 7)
if err != nil {
panic(err)
}
interval := time.Minute * 10 // 10 minutes
for t := range kronika.Every(ctx, start, interval) {
// Perform action here
log.Println(t.Format("2006-01-02 15:04:05"))
}
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