github.com/letsencrypt/trillian@v1.1.2-0.20180615153820-ae375a99d36a/util/time.go (about) 1 // Copyright 2018 Google Inc. All Rights Reserved. 2 // 3 // Licensed under the Apache License, Version 2.0 (the "License"); 4 // you may not use this file except in compliance with the License. 5 // You may obtain a copy of the License at 6 // 7 // http://www.apache.org/licenses/LICENSE-2.0 8 // 9 // Unless required by applicable law or agreed to in writing, software 10 // distributed under the License is distributed on an "AS IS" BASIS, 11 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 12 // See the License for the specific language governing permissions and 13 // limitations under the License. 14 15 package util 16 17 import ( 18 "context" 19 "time" 20 ) 21 22 // Sleep sleeps for at least the specified duration. Returns false iff done is 23 // closed before the timer fires. 24 func Sleep(done <-chan struct{}, dur time.Duration) bool { 25 timer := time.NewTimer(dur) 26 defer timer.Stop() 27 select { 28 case <-timer.C: 29 return true 30 case <-done: 31 return false 32 } 33 } 34 35 // SleepContext sleeps for at least the specified duration. Returns ctx.Err() 36 // iff the context is canceled before the timer fires. 37 func SleepContext(ctx context.Context, dur time.Duration) error { 38 if !Sleep(ctx.Done(), dur) { 39 return ctx.Err() 40 } 41 return nil 42 }