oom_watcher_linux_test.go

Documentation: k8s.io/kubernetes/pkg/kubelet/oom

     1  /*
     2  Copyright 2015 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 oom
    18  
    19  import (
    20  	"fmt"
    21  	"testing"
    22  	"time"
    23  
    24  	v1 "k8s.io/api/core/v1"
    25  	"k8s.io/client-go/tools/record"
    26  
    27  	"github.com/google/cadvisor/utils/oomparser"
    28  	"github.com/stretchr/testify/assert"
    29  )
    30  
    31  type fakeStreamer struct {
    32  	oomInstancesToStream []*oomparser.OomInstance
    33  }
    34  
    35  func (fs *fakeStreamer) StreamOoms(outStream chan<- *oomparser.OomInstance) {
    36  	for _, oomInstance := range fs.oomInstancesToStream {
    37  		outStream <- oomInstance
    38  	}
    39  }
    40  
    41  // TestWatcherRecordsEventsForOomEvents ensures that our OomInstances coming
    42  // from `StreamOoms` are translated into events in our recorder.
    43  func TestWatcherRecordsEventsForOomEvents(t *testing.T) {
    44  	oomInstancesToStream := []*oomparser.OomInstance{
    45  		{
    46  			Pid:                 1000,
    47  			ProcessName:         "fakeProcess",
    48  			TimeOfDeath:         time.Now(),
    49  			ContainerName:       recordEventContainerName + "some-container",
    50  			VictimContainerName: recordEventContainerName,
    51  		},
    52  	}
    53  	numExpectedOomEvents := len(oomInstancesToStream)
    54  
    55  	fakeStreamer := &fakeStreamer{
    56  		oomInstancesToStream: oomInstancesToStream,
    57  	}
    58  
    59  	fakeRecorder := record.NewFakeRecorder(numExpectedOomEvents)
    60  	node := &v1.ObjectReference{}
    61  
    62  	oomWatcher := &realWatcher{
    63  		recorder:    fakeRecorder,
    64  		oomStreamer: fakeStreamer,
    65  	}
    66  	assert.NoError(t, oomWatcher.Start(node))
    67  
    68  	eventsRecorded := getRecordedEvents(fakeRecorder, numExpectedOomEvents)
    69  	assert.Equal(t, numExpectedOomEvents, len(eventsRecorded))
    70  }
    71  
    72  func getRecordedEvents(fakeRecorder *record.FakeRecorder, numExpectedOomEvents int) []string {
    73  	eventsRecorded := []string{}
    74  
    75  	select {
    76  	case event := <-fakeRecorder.Events:
    77  		eventsRecorded = append(eventsRecorded, event)
    78  
    79  		if len(eventsRecorded) == numExpectedOomEvents {
    80  			break
    81  		}
    82  	case <-time.After(10 * time.Second):
    83  		break
    84  	}
    85  
    86  	return eventsRecorded
    87  }
    88  
    89  // TestWatcherRecordsEventsForOomEventsCorrectContainerName verifies that we
    90  // only record OOM events when the container name is the one for which we want
    91  // to record events (i.e. /).
    92  func TestWatcherRecordsEventsForOomEventsCorrectContainerName(t *testing.T) {
    93  	// By "incorrect" container name, we mean a container name for which we
    94  	// don't want to record an oom event.
    95  	numOomEventsWithIncorrectContainerName := 1
    96  	oomInstancesToStream := []*oomparser.OomInstance{
    97  		{
    98  			Pid:                 1000,
    99  			ProcessName:         "fakeProcess",
   100  			TimeOfDeath:         time.Now(),
   101  			ContainerName:       recordEventContainerName + "some-container",
   102  			VictimContainerName: recordEventContainerName,
   103  		},
   104  		{
   105  			Pid:                 1000,
   106  			ProcessName:         "fakeProcess",
   107  			TimeOfDeath:         time.Now(),
   108  			ContainerName:       recordEventContainerName + "kubepods/some-container",
   109  			VictimContainerName: recordEventContainerName + "kubepods",
   110  		},
   111  	}
   112  	numExpectedOomEvents := len(oomInstancesToStream) - numOomEventsWithIncorrectContainerName
   113  
   114  	fakeStreamer := &fakeStreamer{
   115  		oomInstancesToStream: oomInstancesToStream,
   116  	}
   117  
   118  	fakeRecorder := record.NewFakeRecorder(numExpectedOomEvents)
   119  	node := &v1.ObjectReference{}
   120  
   121  	oomWatcher := &realWatcher{
   122  		recorder:    fakeRecorder,
   123  		oomStreamer: fakeStreamer,
   124  	}
   125  	assert.NoError(t, oomWatcher.Start(node))
   126  
   127  	eventsRecorded := getRecordedEvents(fakeRecorder, numExpectedOomEvents)
   128  	assert.Equal(t, numExpectedOomEvents, len(eventsRecorded))
   129  }
   130  
   131  // TestWatcherRecordsEventsForOomEventsWithAdditionalInfo verifies that our the
   132  // emitted event has the proper pid/process data when appropriate.
   133  func TestWatcherRecordsEventsForOomEventsWithAdditionalInfo(t *testing.T) {
   134  	// The process and event info should appear in the event message.
   135  	eventPid := 1000
   136  	processName := "fakeProcess"
   137  
   138  	oomInstancesToStream := []*oomparser.OomInstance{
   139  		{
   140  			Pid:                 eventPid,
   141  			ProcessName:         processName,
   142  			TimeOfDeath:         time.Now(),
   143  			ContainerName:       recordEventContainerName + "some-container",
   144  			VictimContainerName: recordEventContainerName,
   145  		},
   146  	}
   147  	numExpectedOomEvents := len(oomInstancesToStream)
   148  
   149  	fakeStreamer := &fakeStreamer{
   150  		oomInstancesToStream: oomInstancesToStream,
   151  	}
   152  
   153  	fakeRecorder := record.NewFakeRecorder(numExpectedOomEvents)
   154  	node := &v1.ObjectReference{}
   155  
   156  	oomWatcher := &realWatcher{
   157  		recorder:    fakeRecorder,
   158  		oomStreamer: fakeStreamer,
   159  	}
   160  	assert.NoError(t, oomWatcher.Start(node))
   161  
   162  	eventsRecorded := getRecordedEvents(fakeRecorder, numExpectedOomEvents)
   163  
   164  	assert.Equal(t, numExpectedOomEvents, len(eventsRecorded))
   165  	assert.Contains(t, eventsRecorded[0], systemOOMEvent)
   166  	assert.Contains(t, eventsRecorded[0], fmt.Sprintf("pid: %d", eventPid))
   167  	assert.Contains(t, eventsRecorded[0], fmt.Sprintf("victim process: %s", processName))
   168  }
   169
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