k8s.io/apiserver@v0.31.1/pkg/admission/configuration/configuration_manager_test.go (about)

     1  /*
     2  Copyright 2017 The Kubernetes Authors.
     3  
     4  Licensed under the Apache License, Version 2.0 (the "License");
     5  you may not use this file except in compliance with the License.
     6  You may obtain a copy of the License at
     7  
     8      http://www.apache.org/licenses/LICENSE-2.0
     9  
    10  Unless required by applicable law or agreed to in writing, software
    11  distributed under the License is distributed on an "AS IS" BASIS,
    12  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    13  See the License for the specific language governing permissions and
    14  limitations under the License.
    15  */
    16  
    17  package configuration
    18  
    19  import (
    20  	"fmt"
    21  	"math"
    22  	"sync"
    23  	"testing"
    24  	"time"
    25  
    26  	"k8s.io/apimachinery/pkg/runtime"
    27  	"k8s.io/apimachinery/pkg/util/wait"
    28  )
    29  
    30  func TestTolerateBootstrapFailure(t *testing.T) {
    31  	var fakeGetSucceed bool
    32  	var fakeGetSucceedLock sync.RWMutex
    33  	fakeGetFn := func() (runtime.Object, error) {
    34  		fakeGetSucceedLock.RLock()
    35  		defer fakeGetSucceedLock.RUnlock()
    36  		if fakeGetSucceed {
    37  			return nil, nil
    38  		} else {
    39  			return nil, fmt.Errorf("this error shouldn't be exposed to caller")
    40  		}
    41  	}
    42  	poller := newPoller(fakeGetFn)
    43  	poller.bootstrapGracePeriod = 100 * time.Second
    44  	poller.bootstrapRetries = math.MaxInt32
    45  	// set failureThreshold to 0 so that one single failure will set "ready" to false.
    46  	poller.failureThreshold = 0
    47  	stopCh := make(chan struct{})
    48  	defer close(stopCh)
    49  	go poller.Run(stopCh)
    50  	go func() {
    51  		// The test might have false negative, but won't be flaky
    52  		timer := time.NewTimer(2 * time.Second)
    53  		defer timer.Stop()
    54  		<-timer.C
    55  		fakeGetSucceedLock.Lock()
    56  		defer fakeGetSucceedLock.Unlock()
    57  		fakeGetSucceed = true
    58  	}()
    59  
    60  	done := make(chan struct{})
    61  	go func(t *testing.T) {
    62  		_, err := poller.configuration()
    63  		if err != nil {
    64  			t.Errorf("unexpected error: %v", err)
    65  		}
    66  		close(done)
    67  	}(t)
    68  	<-done
    69  }
    70  
    71  func TestNotTolerateNonbootstrapFailure(t *testing.T) {
    72  	fakeGetFn := func() (runtime.Object, error) {
    73  		return nil, fmt.Errorf("this error should be exposed to caller")
    74  	}
    75  	poller := newPoller(fakeGetFn)
    76  	poller.bootstrapGracePeriod = 1 * time.Second
    77  	poller.interval = 1 * time.Millisecond
    78  	stopCh := make(chan struct{})
    79  	defer close(stopCh)
    80  	go poller.Run(stopCh)
    81  	// to kick the bootstrap timer
    82  	go poller.configuration()
    83  
    84  	wait.PollInfinite(1*time.Second, func() (bool, error) {
    85  		poller.lock.Lock()
    86  		defer poller.lock.Unlock()
    87  		return poller.bootstrapped, nil
    88  	})
    89  
    90  	_, err := poller.configuration()
    91  	if err == nil {
    92  		t.Errorf("unexpected no error")
    93  	}
    94  }