github.com/zhyoulun/cilium@v1.6.12/pkg/testutils/condition.go (about) 1 // Copyright 2018 Authors of Cilium 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 testutils 16 17 import ( 18 "fmt" 19 "time" 20 ) 21 22 // ConditionFunc is the function implementing the condition, it must return 23 // true if the condition has been met 24 type ConditionFunc func() bool 25 26 // WaitUntil evaluates the condition every 10 milliseconds and waits for the 27 // condition to be met. The function will time out and return an error after 28 // timeout 29 func WaitUntil(condition ConditionFunc, timeout time.Duration) error { 30 now := time.Now() 31 for { 32 if time.Since(now) > timeout { 33 return fmt.Errorf("timeout reached while waiting for condition") 34 } 35 36 if condition() { 37 return nil 38 } 39 40 time.Sleep(10 * time.Millisecond) 41 } 42 }