498 lines
17 KiB
Go
498 lines
17 KiB
Go
/*
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Copyright 2015 The Kubernetes Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package pleg
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import (
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"errors"
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"fmt"
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"reflect"
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"sort"
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"testing"
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"time"
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"github.com/stretchr/testify/assert"
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"k8s.io/apimachinery/pkg/types"
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"k8s.io/apimachinery/pkg/util/diff"
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kubecontainer "k8s.io/kubernetes/pkg/kubelet/container"
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containertest "k8s.io/kubernetes/pkg/kubelet/container/testing"
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"k8s.io/kubernetes/pkg/util/clock"
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)
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const (
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testContainerRuntimeType = "fooRuntime"
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)
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type TestGenericPLEG struct {
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pleg *GenericPLEG
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runtime *containertest.FakeRuntime
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clock *clock.FakeClock
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}
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func newTestGenericPLEG() *TestGenericPLEG {
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fakeRuntime := &containertest.FakeRuntime{}
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clock := clock.NewFakeClock(time.Time{})
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// The channel capacity should be large enough to hold all events in a
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// single test.
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pleg := &GenericPLEG{
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relistPeriod: time.Hour,
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runtime: fakeRuntime,
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eventChannel: make(chan *PodLifecycleEvent, 100),
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podRecords: make(podRecords),
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clock: clock,
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}
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return &TestGenericPLEG{pleg: pleg, runtime: fakeRuntime, clock: clock}
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}
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func getEventsFromChannel(ch <-chan *PodLifecycleEvent) []*PodLifecycleEvent {
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events := []*PodLifecycleEvent{}
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for len(ch) > 0 {
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e := <-ch
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events = append(events, e)
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}
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return events
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}
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func createTestContainer(ID string, state kubecontainer.ContainerState) *kubecontainer.Container {
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return &kubecontainer.Container{
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ID: kubecontainer.ContainerID{Type: testContainerRuntimeType, ID: ID},
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State: state,
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}
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}
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type sortableEvents []*PodLifecycleEvent
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func (a sortableEvents) Len() int { return len(a) }
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func (a sortableEvents) Swap(i, j int) { a[i], a[j] = a[j], a[i] }
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func (a sortableEvents) Less(i, j int) bool {
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if a[i].ID != a[j].ID {
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return a[i].ID < a[j].ID
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}
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return a[i].Data.(string) < a[j].Data.(string)
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}
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func verifyEvents(t *testing.T, expected, actual []*PodLifecycleEvent) {
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sort.Sort(sortableEvents(expected))
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sort.Sort(sortableEvents(actual))
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if !reflect.DeepEqual(expected, actual) {
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t.Errorf("Actual events differ from the expected; diff:\n %v", diff.ObjectDiff(expected, actual))
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}
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}
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func TestRelisting(t *testing.T) {
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testPleg := newTestGenericPLEG()
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pleg, runtime := testPleg.pleg, testPleg.runtime
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ch := pleg.Watch()
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// The first relist should send a PodSync event to each pod.
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runtime.AllPodList = []*containertest.FakePod{
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{Pod: &kubecontainer.Pod{
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ID: "1234",
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Containers: []*kubecontainer.Container{
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createTestContainer("c1", kubecontainer.ContainerStateExited),
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createTestContainer("c2", kubecontainer.ContainerStateRunning),
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createTestContainer("c3", kubecontainer.ContainerStateUnknown),
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},
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}},
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{Pod: &kubecontainer.Pod{
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ID: "4567",
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Containers: []*kubecontainer.Container{
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createTestContainer("c1", kubecontainer.ContainerStateExited),
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},
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}},
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}
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pleg.relist()
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// Report every running/exited container if we see them for the first time.
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expected := []*PodLifecycleEvent{
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{ID: "1234", Type: ContainerStarted, Data: "c2"},
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{ID: "4567", Type: ContainerDied, Data: "c1"},
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{ID: "1234", Type: ContainerDied, Data: "c1"},
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}
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actual := getEventsFromChannel(ch)
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verifyEvents(t, expected, actual)
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// The second relist should not send out any event because no container has
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// changed.
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pleg.relist()
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verifyEvents(t, expected, actual)
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runtime.AllPodList = []*containertest.FakePod{
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{Pod: &kubecontainer.Pod{
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ID: "1234",
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Containers: []*kubecontainer.Container{
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createTestContainer("c2", kubecontainer.ContainerStateExited),
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createTestContainer("c3", kubecontainer.ContainerStateRunning),
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},
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}},
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{Pod: &kubecontainer.Pod{
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ID: "4567",
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Containers: []*kubecontainer.Container{
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createTestContainer("c4", kubecontainer.ContainerStateRunning),
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},
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}},
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}
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pleg.relist()
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// Only report containers that transitioned to running or exited status.
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expected = []*PodLifecycleEvent{
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{ID: "1234", Type: ContainerRemoved, Data: "c1"},
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{ID: "1234", Type: ContainerDied, Data: "c2"},
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{ID: "1234", Type: ContainerStarted, Data: "c3"},
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{ID: "4567", Type: ContainerRemoved, Data: "c1"},
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{ID: "4567", Type: ContainerStarted, Data: "c4"},
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}
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actual = getEventsFromChannel(ch)
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verifyEvents(t, expected, actual)
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}
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func TestDetectingContainerDeaths(t *testing.T) {
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// Vary the number of relists after the container started and before the
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// container died to account for the changes in pleg's internal states.
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testReportMissingContainers(t, 1)
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testReportMissingPods(t, 1)
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testReportMissingContainers(t, 3)
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testReportMissingPods(t, 3)
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}
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func testReportMissingContainers(t *testing.T, numRelists int) {
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testPleg := newTestGenericPLEG()
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pleg, runtime := testPleg.pleg, testPleg.runtime
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ch := pleg.Watch()
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runtime.AllPodList = []*containertest.FakePod{
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{Pod: &kubecontainer.Pod{
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ID: "1234",
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Containers: []*kubecontainer.Container{
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createTestContainer("c1", kubecontainer.ContainerStateRunning),
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createTestContainer("c2", kubecontainer.ContainerStateRunning),
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createTestContainer("c3", kubecontainer.ContainerStateExited),
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},
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}},
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}
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// Relist and drain the events from the channel.
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for i := 0; i < numRelists; i++ {
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pleg.relist()
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getEventsFromChannel(ch)
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}
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// Container c2 was stopped and removed between relists. We should report
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// the event. The exited container c3 was garbage collected (i.e., removed)
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// between relists. We should ignore that event.
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runtime.AllPodList = []*containertest.FakePod{
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{Pod: &kubecontainer.Pod{
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ID: "1234",
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Containers: []*kubecontainer.Container{
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createTestContainer("c1", kubecontainer.ContainerStateRunning),
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},
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}},
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}
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pleg.relist()
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expected := []*PodLifecycleEvent{
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{ID: "1234", Type: ContainerDied, Data: "c2"},
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{ID: "1234", Type: ContainerRemoved, Data: "c2"},
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{ID: "1234", Type: ContainerRemoved, Data: "c3"},
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}
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actual := getEventsFromChannel(ch)
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verifyEvents(t, expected, actual)
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}
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func testReportMissingPods(t *testing.T, numRelists int) {
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testPleg := newTestGenericPLEG()
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pleg, runtime := testPleg.pleg, testPleg.runtime
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ch := pleg.Watch()
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runtime.AllPodList = []*containertest.FakePod{
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{Pod: &kubecontainer.Pod{
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ID: "1234",
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Containers: []*kubecontainer.Container{
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createTestContainer("c2", kubecontainer.ContainerStateRunning),
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},
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}},
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}
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// Relist and drain the events from the channel.
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for i := 0; i < numRelists; i++ {
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pleg.relist()
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getEventsFromChannel(ch)
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}
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// Container c2 was stopped and removed between relists. We should report
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// the event.
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runtime.AllPodList = []*containertest.FakePod{}
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pleg.relist()
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expected := []*PodLifecycleEvent{
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{ID: "1234", Type: ContainerDied, Data: "c2"},
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{ID: "1234", Type: ContainerRemoved, Data: "c2"},
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}
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actual := getEventsFromChannel(ch)
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verifyEvents(t, expected, actual)
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}
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func newTestGenericPLEGWithRuntimeMock() (*GenericPLEG, *containertest.Mock) {
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runtimeMock := &containertest.Mock{}
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pleg := &GenericPLEG{
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relistPeriod: time.Hour,
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runtime: runtimeMock,
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eventChannel: make(chan *PodLifecycleEvent, 100),
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podRecords: make(podRecords),
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cache: kubecontainer.NewCache(),
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clock: clock.RealClock{},
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}
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return pleg, runtimeMock
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}
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func createTestPodsStatusesAndEvents(num int) ([]*kubecontainer.Pod, []*kubecontainer.PodStatus, []*PodLifecycleEvent) {
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var pods []*kubecontainer.Pod
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var statuses []*kubecontainer.PodStatus
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var events []*PodLifecycleEvent
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for i := 0; i < num; i++ {
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id := types.UID(fmt.Sprintf("test-pod-%d", i))
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cState := kubecontainer.ContainerStateRunning
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container := createTestContainer(fmt.Sprintf("c%d", i), cState)
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pod := &kubecontainer.Pod{
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ID: id,
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Containers: []*kubecontainer.Container{container},
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}
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status := &kubecontainer.PodStatus{
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ID: id,
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ContainerStatuses: []*kubecontainer.ContainerStatus{{ID: container.ID, State: cState}},
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}
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event := &PodLifecycleEvent{ID: pod.ID, Type: ContainerStarted, Data: container.ID.ID}
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pods = append(pods, pod)
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statuses = append(statuses, status)
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events = append(events, event)
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}
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return pods, statuses, events
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}
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func TestRelistWithCache(t *testing.T) {
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pleg, runtimeMock := newTestGenericPLEGWithRuntimeMock()
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ch := pleg.Watch()
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pods, statuses, events := createTestPodsStatusesAndEvents(2)
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runtimeMock.On("GetPods", true).Return(pods, nil)
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runtimeMock.On("GetPodStatus", pods[0].ID, "", "").Return(statuses[0], nil).Once()
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// Inject an error when querying runtime for the pod status for pods[1].
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statusErr := fmt.Errorf("unable to get status")
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runtimeMock.On("GetPodStatus", pods[1].ID, "", "").Return(&kubecontainer.PodStatus{}, statusErr).Once()
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pleg.relist()
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actualEvents := getEventsFromChannel(ch)
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cases := []struct {
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pod *kubecontainer.Pod
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status *kubecontainer.PodStatus
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error error
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}{
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{pod: pods[0], status: statuses[0], error: nil},
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{pod: pods[1], status: &kubecontainer.PodStatus{}, error: statusErr},
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}
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for i, c := range cases {
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testStr := fmt.Sprintf("test[%d]", i)
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actualStatus, actualErr := pleg.cache.Get(c.pod.ID)
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assert.Equal(t, c.status, actualStatus, testStr)
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assert.Equal(t, c.error, actualErr, testStr)
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}
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// pleg should not generate any event for pods[1] because of the error.
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assert.Exactly(t, []*PodLifecycleEvent{events[0]}, actualEvents)
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// Return normal status for pods[1].
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runtimeMock.On("GetPodStatus", pods[1].ID, "", "").Return(statuses[1], nil).Once()
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pleg.relist()
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actualEvents = getEventsFromChannel(ch)
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cases = []struct {
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pod *kubecontainer.Pod
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status *kubecontainer.PodStatus
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error error
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}{
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{pod: pods[0], status: statuses[0], error: nil},
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{pod: pods[1], status: statuses[1], error: nil},
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}
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for i, c := range cases {
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testStr := fmt.Sprintf("test[%d]", i)
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actualStatus, actualErr := pleg.cache.Get(c.pod.ID)
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assert.Equal(t, c.status, actualStatus, testStr)
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assert.Equal(t, c.error, actualErr, testStr)
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}
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// Now that we are able to query status for pods[1], pleg should generate an event.
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assert.Exactly(t, []*PodLifecycleEvent{events[1]}, actualEvents)
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}
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func TestRemoveCacheEntry(t *testing.T) {
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pleg, runtimeMock := newTestGenericPLEGWithRuntimeMock()
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pods, statuses, _ := createTestPodsStatusesAndEvents(1)
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runtimeMock.On("GetPods", true).Return(pods, nil).Once()
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runtimeMock.On("GetPodStatus", pods[0].ID, "", "").Return(statuses[0], nil).Once()
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// Does a relist to populate the cache.
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pleg.relist()
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// Delete the pod from runtime. Verify that the cache entry has been
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// removed after relisting.
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runtimeMock.On("GetPods", true).Return([]*kubecontainer.Pod{}, nil).Once()
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pleg.relist()
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actualStatus, actualErr := pleg.cache.Get(pods[0].ID)
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assert.Equal(t, &kubecontainer.PodStatus{ID: pods[0].ID}, actualStatus)
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assert.Equal(t, nil, actualErr)
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}
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func TestHealthy(t *testing.T) {
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testPleg := newTestGenericPLEG()
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pleg, _, clock := testPleg.pleg, testPleg.runtime, testPleg.clock
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ok, _ := pleg.Healthy()
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assert.True(t, ok, "pleg should be healthy")
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// Advance the clock without any relisting.
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clock.Step(time.Minute * 10)
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ok, _ = pleg.Healthy()
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assert.False(t, ok, "pleg should be unhealthy")
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// Relist and than advance the time by 1 minute. pleg should be healthy
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// because this is within the allowed limit.
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pleg.relist()
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clock.Step(time.Minute * 1)
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ok, _ = pleg.Healthy()
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assert.True(t, ok, "pleg should be healthy")
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}
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func TestRelistWithReinspection(t *testing.T) {
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pleg, runtimeMock := newTestGenericPLEGWithRuntimeMock()
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ch := pleg.Watch()
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infraContainer := createTestContainer("infra", kubecontainer.ContainerStateRunning)
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podID := types.UID("test-pod")
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pods := []*kubecontainer.Pod{{
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ID: podID,
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Containers: []*kubecontainer.Container{infraContainer},
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}}
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runtimeMock.On("GetPods", true).Return(pods, nil).Once()
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goodStatus := &kubecontainer.PodStatus{
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ID: podID,
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ContainerStatuses: []*kubecontainer.ContainerStatus{{ID: infraContainer.ID, State: infraContainer.State}},
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}
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runtimeMock.On("GetPodStatus", podID, "", "").Return(goodStatus, nil).Once()
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goodEvent := &PodLifecycleEvent{ID: podID, Type: ContainerStarted, Data: infraContainer.ID.ID}
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// listing 1 - everything ok, infra container set up for pod
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pleg.relist()
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actualEvents := getEventsFromChannel(ch)
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actualStatus, actualErr := pleg.cache.Get(podID)
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assert.Equal(t, goodStatus, actualStatus)
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assert.Equal(t, nil, actualErr)
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assert.Exactly(t, []*PodLifecycleEvent{goodEvent}, actualEvents)
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// listing 2 - pretend runtime was in the middle of creating the non-infra container for the pod
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// and return an error during inspection
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transientContainer := createTestContainer("transient", kubecontainer.ContainerStateUnknown)
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podsWithTransientContainer := []*kubecontainer.Pod{{
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ID: podID,
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Containers: []*kubecontainer.Container{infraContainer, transientContainer},
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}}
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runtimeMock.On("GetPods", true).Return(podsWithTransientContainer, nil).Once()
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badStatus := &kubecontainer.PodStatus{
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ID: podID,
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ContainerStatuses: []*kubecontainer.ContainerStatus{},
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}
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runtimeMock.On("GetPodStatus", podID, "", "").Return(badStatus, errors.New("inspection error")).Once()
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pleg.relist()
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actualEvents = getEventsFromChannel(ch)
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actualStatus, actualErr = pleg.cache.Get(podID)
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assert.Equal(t, badStatus, actualStatus)
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assert.Equal(t, errors.New("inspection error"), actualErr)
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assert.Exactly(t, []*PodLifecycleEvent{}, actualEvents)
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// listing 3 - pretend the transient container has now disappeared, leaving just the infra
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// container. Make sure the pod is reinspected for its status and the cache is updated.
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runtimeMock.On("GetPods", true).Return(pods, nil).Once()
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runtimeMock.On("GetPodStatus", podID, "", "").Return(goodStatus, nil).Once()
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pleg.relist()
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actualEvents = getEventsFromChannel(ch)
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actualStatus, actualErr = pleg.cache.Get(podID)
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assert.Equal(t, goodStatus, actualStatus)
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assert.Equal(t, nil, actualErr)
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// no events are expected because relist #1 set the old pod record which has the infra container
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// running. relist #2 had the inspection error and therefore didn't modify either old or new.
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// relist #3 forced the reinspection of the pod to retrieve its status, but because the list of
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// containers was the same as relist #1, nothing "changed", so there are no new events.
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assert.Exactly(t, []*PodLifecycleEvent{}, actualEvents)
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}
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// Test detecting sandbox state changes.
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func TestRelistingWithSandboxes(t *testing.T) {
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testPleg := newTestGenericPLEG()
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pleg, runtime := testPleg.pleg, testPleg.runtime
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ch := pleg.Watch()
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// The first relist should send a PodSync event to each pod.
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runtime.AllPodList = []*containertest.FakePod{
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{Pod: &kubecontainer.Pod{
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ID: "1234",
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Sandboxes: []*kubecontainer.Container{
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createTestContainer("c1", kubecontainer.ContainerStateExited),
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createTestContainer("c2", kubecontainer.ContainerStateRunning),
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createTestContainer("c3", kubecontainer.ContainerStateUnknown),
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},
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}},
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{Pod: &kubecontainer.Pod{
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ID: "4567",
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Sandboxes: []*kubecontainer.Container{
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createTestContainer("c1", kubecontainer.ContainerStateExited),
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},
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}},
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}
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pleg.relist()
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// Report every running/exited container if we see them for the first time.
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expected := []*PodLifecycleEvent{
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{ID: "1234", Type: ContainerStarted, Data: "c2"},
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{ID: "4567", Type: ContainerDied, Data: "c1"},
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{ID: "1234", Type: ContainerDied, Data: "c1"},
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}
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actual := getEventsFromChannel(ch)
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verifyEvents(t, expected, actual)
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// The second relist should not send out any event because no container has
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// changed.
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pleg.relist()
|
|
verifyEvents(t, expected, actual)
|
|
|
|
runtime.AllPodList = []*containertest.FakePod{
|
|
{Pod: &kubecontainer.Pod{
|
|
ID: "1234",
|
|
Sandboxes: []*kubecontainer.Container{
|
|
createTestContainer("c2", kubecontainer.ContainerStateExited),
|
|
createTestContainer("c3", kubecontainer.ContainerStateRunning),
|
|
},
|
|
}},
|
|
{Pod: &kubecontainer.Pod{
|
|
ID: "4567",
|
|
Sandboxes: []*kubecontainer.Container{
|
|
createTestContainer("c4", kubecontainer.ContainerStateRunning),
|
|
},
|
|
}},
|
|
}
|
|
pleg.relist()
|
|
// Only report containers that transitioned to running or exited status.
|
|
expected = []*PodLifecycleEvent{
|
|
{ID: "1234", Type: ContainerRemoved, Data: "c1"},
|
|
{ID: "1234", Type: ContainerDied, Data: "c2"},
|
|
{ID: "1234", Type: ContainerStarted, Data: "c3"},
|
|
{ID: "4567", Type: ContainerRemoved, Data: "c1"},
|
|
{ID: "4567", Type: ContainerStarted, Data: "c4"},
|
|
}
|
|
|
|
actual = getEventsFromChannel(ch)
|
|
verifyEvents(t, expected, actual)
|
|
}
|