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  }