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timer.go
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timer.go
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/*
* Copyright (c) 2017, The Easegress Authors
* All rights reserved.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package statussynccontroller
import (
"time"
)
const (
// SyncStatusPaceInUnixSeconds must be 5s because the rates of http stat.
// https://github.com/rcrowley/go-metrics/blob/3113b8401b8a98917cde58f8bbd42a1b1c03b1fd/ewma.go#L98-L99
SyncStatusPaceInUnixSeconds = 5
)
func nextSyncStatusDuration() time.Duration {
return nextDuration(time.Now(), SyncStatusPaceInUnixSeconds)
}
// nextDuration returns the next duration after t,
// plus satisfying the pace in UNIX seconds(minimum unit for now).
func nextDuration(t time.Time, paceInUnixSeconds int) time.Duration {
paceInNano := int64(paceInUnixSeconds) * int64(time.Second/time.Nanosecond)
rounds := t.UnixNano() / paceInNano
return time.Duration(paceInNano*(rounds+1) - t.UnixNano())
}