536 lines
18 KiB
Go
536 lines
18 KiB
Go
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// Copyright 2021 the Pinniped contributors. All Rights Reserved.
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// SPDX-License-Identifier: Apache-2.0
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package impersonatorconfig
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import (
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"context"
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"crypto/tls"
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"errors"
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"fmt"
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"io/ioutil"
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"net"
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"net/http"
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"strings"
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"testing"
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"time"
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"github.com/sclevine/spec"
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"github.com/sclevine/spec/report"
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"github.com/stretchr/testify/require"
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corev1 "k8s.io/api/core/v1"
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metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
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"k8s.io/apimachinery/pkg/runtime/schema"
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kubeinformers "k8s.io/client-go/informers"
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kubernetesfake "k8s.io/client-go/kubernetes/fake"
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coretesting "k8s.io/client-go/testing"
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"k8s.io/client-go/tools/cache"
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"go.pinniped.dev/internal/controllerlib"
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"go.pinniped.dev/internal/here"
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"go.pinniped.dev/internal/testutil"
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)
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type tlsListenerWrapper struct {
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listener net.Listener
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closeError error
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}
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func (t *tlsListenerWrapper) Accept() (net.Conn, error) {
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return t.listener.Accept()
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}
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func (t *tlsListenerWrapper) Close() error {
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if t.closeError != nil {
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// Really close the connection and then "pretend" that there was an error during close.
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_ = t.listener.Close()
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return t.closeError
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}
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return t.listener.Close()
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}
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func (t *tlsListenerWrapper) Addr() net.Addr {
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return t.listener.Addr()
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}
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func TestImpersonatorConfigControllerOptions(t *testing.T) {
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spec.Run(t, "options", func(t *testing.T, when spec.G, it spec.S) {
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const installedInNamespace = "some-namespace"
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const configMapResourceName = "some-configmap-resource-name"
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const generatedLoadBalancerServiceName = "some-service-resource-name"
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var r *require.Assertions
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var observableWithInformerOption *testutil.ObservableWithInformerOption
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var observableWithInitialEventOption *testutil.ObservableWithInitialEventOption
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var configMapsInformerFilter controllerlib.Filter
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it.Before(func() {
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r = require.New(t)
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observableWithInformerOption = testutil.NewObservableWithInformerOption()
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observableWithInitialEventOption = testutil.NewObservableWithInitialEventOption()
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configMapsInformer := kubeinformers.NewSharedInformerFactory(nil, 0).Core().V1().ConfigMaps()
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_ = NewImpersonatorConfigController(
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installedInNamespace,
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configMapResourceName,
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nil,
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configMapsInformer,
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observableWithInformerOption.WithInformer,
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observableWithInitialEventOption.WithInitialEvent,
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generatedLoadBalancerServiceName,
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nil,
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nil,
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)
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configMapsInformerFilter = observableWithInformerOption.GetFilterForInformer(configMapsInformer)
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})
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when("watching ConfigMap objects", func() {
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var subject controllerlib.Filter
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var target, wrongNamespace, wrongName, unrelated *corev1.ConfigMap
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it.Before(func() {
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subject = configMapsInformerFilter
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target = &corev1.ConfigMap{ObjectMeta: metav1.ObjectMeta{Name: configMapResourceName, Namespace: installedInNamespace}}
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wrongNamespace = &corev1.ConfigMap{ObjectMeta: metav1.ObjectMeta{Name: configMapResourceName, Namespace: "wrong-namespace"}}
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wrongName = &corev1.ConfigMap{ObjectMeta: metav1.ObjectMeta{Name: "wrong-name", Namespace: installedInNamespace}}
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unrelated = &corev1.ConfigMap{ObjectMeta: metav1.ObjectMeta{Name: "wrong-name", Namespace: "wrong-namespace"}}
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})
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when("the target ConfigMap changes", func() {
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it("returns true to trigger the sync method", func() {
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r.True(subject.Add(target))
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r.True(subject.Update(target, unrelated))
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r.True(subject.Update(unrelated, target))
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r.True(subject.Delete(target))
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})
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})
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when("a ConfigMap from another namespace changes", func() {
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it("returns false to avoid triggering the sync method", func() {
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r.False(subject.Add(wrongNamespace))
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r.False(subject.Update(wrongNamespace, unrelated))
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r.False(subject.Update(unrelated, wrongNamespace))
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r.False(subject.Delete(wrongNamespace))
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})
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})
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when("a ConfigMap with a different name changes", func() {
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it("returns false to avoid triggering the sync method", func() {
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r.False(subject.Add(wrongName))
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r.False(subject.Update(wrongName, unrelated))
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r.False(subject.Update(unrelated, wrongName))
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r.False(subject.Delete(wrongName))
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})
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})
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when("a ConfigMap with a different name and a different namespace changes", func() {
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it("returns false to avoid triggering the sync method", func() {
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r.False(subject.Add(unrelated))
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r.False(subject.Update(unrelated, unrelated))
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r.False(subject.Delete(unrelated))
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})
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})
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})
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when("starting up", func() {
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it("asks for an initial event because the ConfigMap may not exist yet and it needs to run anyway", func() {
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r.Equal(&controllerlib.Key{
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Namespace: installedInNamespace,
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Name: configMapResourceName,
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}, observableWithInitialEventOption.GetInitialEventKey())
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})
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})
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}, spec.Parallel(), spec.Report(report.Terminal{}))
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}
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func TestImpersonatorConfigControllerSync(t *testing.T) {
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spec.Run(t, "Sync", func(t *testing.T, when spec.G, it spec.S) {
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const installedInNamespace = "some-namespace"
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const configMapResourceName = "some-configmap-resource-name"
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const generatedLoadBalancerServiceName = "some-service-resource-name"
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var r *require.Assertions
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var subject controllerlib.Controller
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var kubeAPIClient *kubernetesfake.Clientset
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var kubeInformerClient *kubernetesfake.Clientset
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var kubeInformers kubeinformers.SharedInformerFactory
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var timeoutContext context.Context
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var timeoutContextCancel context.CancelFunc
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var syncContext *controllerlib.Context
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var startTLSListenerFuncWasCalled int
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var startTLSListenerFuncError error
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var startTLSListenerUponCloseError error
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var httpHanderFactoryFuncError error
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var startedTLSListener net.Listener
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var startTLSListenerFunc = func(network, listenAddress string, config *tls.Config) (net.Listener, error) {
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startTLSListenerFuncWasCalled++
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r.Equal("tcp", network)
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r.Equal(":8444", listenAddress)
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r.Equal(uint16(tls.VersionTLS12), config.MinVersion)
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if startTLSListenerFuncError != nil {
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return nil, startTLSListenerFuncError
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}
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var err error
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//nolint: gosec // Intentionally binding to all network interfaces.
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startedTLSListener, err = tls.Listen(network, ":0", config) // automatically choose the port for unit tests
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r.NoError(err)
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return &tlsListenerWrapper{listener: startedTLSListener, closeError: startTLSListenerUponCloseError}, nil
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}
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var closeTLSListener = func() {
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if startedTLSListener != nil {
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err := startedTLSListener.Close()
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// Ignore when the production code has already closed the server because there is nothing to
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// clean up in that case.
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if err != nil && !strings.Contains(err.Error(), "use of closed network connection") {
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r.NoError(err)
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}
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}
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}
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var requireTLSServerIsRunning = func() {
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r.Greater(startTLSListenerFuncWasCalled, 0)
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tr := &http.Transport{
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TLSClientConfig: &tls.Config{InsecureSkipVerify: true}, //nolint:gosec // TODO once we're using certs, do not skip verify
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}
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client := &http.Client{Transport: tr}
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url := "https://" + startedTLSListener.Addr().String()
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req, err := http.NewRequestWithContext(context.Background(), "GET", url, nil)
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r.NoError(err)
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resp, err := client.Do(req)
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r.NoError(err)
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r.Equal(http.StatusOK, resp.StatusCode)
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body, err := ioutil.ReadAll(resp.Body)
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r.NoError(resp.Body.Close())
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r.NoError(err)
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r.Equal("hello world", string(body))
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}
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var requireTLSServerIsNoLongerRunning = func() {
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r.Greater(startTLSListenerFuncWasCalled, 0)
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_, err := tls.Dial(
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startedTLSListener.Addr().Network(),
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startedTLSListener.Addr().String(),
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&tls.Config{InsecureSkipVerify: true}, //nolint:gosec // TODO once we're using certs, do not skip verify
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)
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r.Error(err)
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r.Regexp(`dial tcp \[::\]:[0-9]+: connect: connection refused`, err.Error())
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}
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var requireTLSServerWasNeverStarted = func() {
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r.Equal(0, startTLSListenerFuncWasCalled)
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}
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var waitForInformerCacheToSeeResourceVersion = func(informer cache.SharedIndexInformer, wantVersion string) {
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r.Eventually(func() bool {
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return informer.LastSyncResourceVersion() == wantVersion
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}, 10*time.Second, time.Millisecond)
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}
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// Defer starting the informers until the last possible moment so that the
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// nested Before's can keep adding things to the informer caches.
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var startInformersAndController = func() {
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// Set this at the last second to allow for injection of server override.
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subject = NewImpersonatorConfigController(
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installedInNamespace,
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configMapResourceName,
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kubeAPIClient,
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kubeInformers.Core().V1().ConfigMaps(),
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controllerlib.WithInformer,
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controllerlib.WithInitialEvent,
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generatedLoadBalancerServiceName,
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startTLSListenerFunc,
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func() (http.Handler, error) {
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return http.HandlerFunc(func(w http.ResponseWriter, req *http.Request) {
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_, err := fmt.Fprintf(w, "hello world")
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r.NoError(err)
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}), httpHanderFactoryFuncError
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},
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)
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// Set this at the last second to support calling subject.Name().
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syncContext = &controllerlib.Context{
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Context: timeoutContext,
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Name: subject.Name(),
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Key: controllerlib.Key{
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Namespace: installedInNamespace,
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Name: configMapResourceName,
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},
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}
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// Must start informers before calling TestRunSynchronously()
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kubeInformers.Start(timeoutContext.Done())
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controllerlib.TestRunSynchronously(t, subject)
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}
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var addImpersonatorConfigMapToTracker = func(resourceName, configYAML string) {
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impersonatorConfigMap := &corev1.ConfigMap{
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ObjectMeta: metav1.ObjectMeta{
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Name: resourceName,
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Namespace: installedInNamespace,
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// Note that this seems to be ignored by the informer during initial creation, so actually
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// the informer will see this as resource version "". Leaving it here to express the intent
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// that the initial version is version 0.
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ResourceVersion: "0",
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},
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Data: map[string]string{
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"config.yaml": configYAML,
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},
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}
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r.NoError(kubeInformerClient.Tracker().Add(impersonatorConfigMap))
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}
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var updateImpersonatorConfigMapInTracker = func(resourceName, configYAML, newResourceVersion string) {
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impersonatorConfigMap := &corev1.ConfigMap{
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ObjectMeta: metav1.ObjectMeta{
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Name: resourceName,
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Namespace: installedInNamespace,
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// Different resource version compared to the initial version when this resource was created
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// so we can tell when the informer cache has cached this newly updated version.
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ResourceVersion: newResourceVersion,
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},
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Data: map[string]string{
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"config.yaml": configYAML,
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},
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}
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r.NoError(kubeInformerClient.Tracker().Update(
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schema.GroupVersionResource{Version: "v1", Resource: "configmaps"},
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impersonatorConfigMap,
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installedInNamespace,
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))
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}
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var addNodeWithRoleToTracker = func(role string) {
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r.NoError(kubeAPIClient.Tracker().Add(
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&corev1.Node{
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ObjectMeta: metav1.ObjectMeta{
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Name: "node",
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Labels: map[string]string{"kubernetes.io/node-role": role},
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},
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},
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))
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}
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it.Before(func() {
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r = require.New(t)
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timeoutContext, timeoutContextCancel = context.WithTimeout(context.Background(), time.Second*3)
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kubeInformerClient = kubernetesfake.NewSimpleClientset()
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kubeInformers = kubeinformers.NewSharedInformerFactoryWithOptions(kubeInformerClient, 0,
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kubeinformers.WithNamespace(installedInNamespace),
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)
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kubeAPIClient = kubernetesfake.NewSimpleClientset()
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})
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it.After(func() {
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timeoutContextCancel()
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closeTLSListener()
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})
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when("the ConfigMap does not yet exist in the installation namespace or it was deleted (defaults to auto mode)", func() {
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it.Before(func() {
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addImpersonatorConfigMapToTracker("some-other-ConfigMap", "foo: bar")
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})
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when("there are visible control plane nodes", func() {
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it.Before(func() {
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addNodeWithRoleToTracker("control-plane")
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})
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it("does not start the impersonator", func() {
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startInformersAndController()
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r.NoError(controllerlib.TestSync(t, subject, *syncContext))
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requireTLSServerWasNeverStarted()
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})
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})
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when("there are not visible control plane nodes", func() {
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it.Before(func() {
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addNodeWithRoleToTracker("worker")
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})
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it("automatically starts the impersonator", func() {
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startInformersAndController()
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r.NoError(controllerlib.TestSync(t, subject, *syncContext))
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requireTLSServerIsRunning()
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})
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})
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})
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when("sync is called more than once", func() {
|
||
|
|
it.Before(func() {
|
||
|
|
addNodeWithRoleToTracker("worker")
|
||
|
|
})
|
||
|
|
|
||
|
|
it("only starts the impersonator once and only lists the cluster's nodes once", func() {
|
||
|
|
startInformersAndController()
|
||
|
|
r.NoError(controllerlib.TestSync(t, subject, *syncContext))
|
||
|
|
r.Equal(
|
||
|
|
[]coretesting.Action{
|
||
|
|
coretesting.NewListAction(
|
||
|
|
schema.GroupVersionResource{Version: "v1", Resource: "nodes"},
|
||
|
|
schema.GroupVersionKind{Group: "", Version: "v1", Kind: "Node"},
|
||
|
|
"",
|
||
|
|
metav1.ListOptions{}),
|
||
|
|
},
|
||
|
|
kubeAPIClient.Actions(),
|
||
|
|
)
|
||
|
|
|
||
|
|
r.NoError(controllerlib.TestSync(t, subject, *syncContext))
|
||
|
|
r.Equal(1, startTLSListenerFuncWasCalled) // wasn't started a second time
|
||
|
|
requireTLSServerIsRunning() // still running
|
||
|
|
r.Equal(1, len(kubeAPIClient.Actions())) // no new API calls
|
||
|
|
})
|
||
|
|
})
|
||
|
|
|
||
|
|
when("getting the control plane nodes returns an error, e.g. when there are no nodes", func() {
|
||
|
|
it("returns an error", func() {
|
||
|
|
startInformersAndController()
|
||
|
|
r.EqualError(controllerlib.TestSync(t, subject, *syncContext), "no nodes found")
|
||
|
|
requireTLSServerWasNeverStarted()
|
||
|
|
})
|
||
|
|
})
|
||
|
|
|
||
|
|
when("the http handler factory function returns an error", func() {
|
||
|
|
it.Before(func() {
|
||
|
|
addNodeWithRoleToTracker("worker")
|
||
|
|
httpHanderFactoryFuncError = errors.New("some factory error")
|
||
|
|
})
|
||
|
|
|
||
|
|
it("returns an error", func() {
|
||
|
|
startInformersAndController()
|
||
|
|
r.EqualError(controllerlib.TestSync(t, subject, *syncContext), "some factory error")
|
||
|
|
requireTLSServerWasNeverStarted()
|
||
|
|
})
|
||
|
|
})
|
||
|
|
|
||
|
|
when("the configmap is invalid", func() {
|
||
|
|
it.Before(func() {
|
||
|
|
addImpersonatorConfigMapToTracker(configMapResourceName, "not yaml")
|
||
|
|
})
|
||
|
|
|
||
|
|
it("returns an error", func() {
|
||
|
|
startInformersAndController()
|
||
|
|
r.EqualError(controllerlib.TestSync(t, subject, *syncContext), "invalid impersonator configuration: decode yaml: error unmarshaling JSON: while decoding JSON: json: cannot unmarshal string into Go value of type impersonator.Config")
|
||
|
|
requireTLSServerWasNeverStarted()
|
||
|
|
})
|
||
|
|
})
|
||
|
|
|
||
|
|
when("the ConfigMap is already in the installation namespace", func() {
|
||
|
|
when("the configuration is auto mode with an endpoint", func() {
|
||
|
|
it.Before(func() {
|
||
|
|
addImpersonatorConfigMapToTracker(configMapResourceName, here.Doc(`
|
||
|
|
mode: auto
|
||
|
|
endpoint: https://proxy.example.com:8443/
|
||
|
|
`),
|
||
|
|
)
|
||
|
|
})
|
||
|
|
|
||
|
|
when("there are visible control plane nodes", func() {
|
||
|
|
it.Before(func() {
|
||
|
|
addNodeWithRoleToTracker("control-plane")
|
||
|
|
})
|
||
|
|
|
||
|
|
it("does not start the impersonator", func() {
|
||
|
|
startInformersAndController()
|
||
|
|
r.NoError(controllerlib.TestSync(t, subject, *syncContext))
|
||
|
|
requireTLSServerWasNeverStarted()
|
||
|
|
})
|
||
|
|
})
|
||
|
|
|
||
|
|
when("there are not visible control plane nodes", func() {
|
||
|
|
it.Before(func() {
|
||
|
|
addNodeWithRoleToTracker("worker")
|
||
|
|
})
|
||
|
|
|
||
|
|
it("starts the impersonator according to the settings in the ConfigMap", func() {
|
||
|
|
startInformersAndController()
|
||
|
|
r.NoError(controllerlib.TestSync(t, subject, *syncContext))
|
||
|
|
requireTLSServerIsRunning()
|
||
|
|
})
|
||
|
|
})
|
||
|
|
})
|
||
|
|
|
||
|
|
when("the configuration is disabled mode", func() {
|
||
|
|
it.Before(func() {
|
||
|
|
addImpersonatorConfigMapToTracker(configMapResourceName, "mode: disabled")
|
||
|
|
addNodeWithRoleToTracker("worker")
|
||
|
|
})
|
||
|
|
|
||
|
|
it("does not start the impersonator", func() {
|
||
|
|
startInformersAndController()
|
||
|
|
r.NoError(controllerlib.TestSync(t, subject, *syncContext))
|
||
|
|
requireTLSServerWasNeverStarted()
|
||
|
|
})
|
||
|
|
})
|
||
|
|
|
||
|
|
when("the configuration is enabled mode", func() {
|
||
|
|
it.Before(func() {
|
||
|
|
addImpersonatorConfigMapToTracker(configMapResourceName, "mode: enabled")
|
||
|
|
addNodeWithRoleToTracker("control-plane")
|
||
|
|
})
|
||
|
|
|
||
|
|
it("starts the impersonator regardless of the visibility of control plane nodes", func() {
|
||
|
|
startInformersAndController()
|
||
|
|
r.NoError(controllerlib.TestSync(t, subject, *syncContext))
|
||
|
|
requireTLSServerIsRunning()
|
||
|
|
})
|
||
|
|
|
||
|
|
it("returns an error when the tls listener fails to start", func() {
|
||
|
|
startTLSListenerFuncError = errors.New("tls error")
|
||
|
|
startInformersAndController()
|
||
|
|
r.EqualError(controllerlib.TestSync(t, subject, *syncContext), "tls error")
|
||
|
|
})
|
||
|
|
})
|
||
|
|
|
||
|
|
when("the configuration switches from enabled to disabled mode", func() {
|
||
|
|
it.Before(func() {
|
||
|
|
addImpersonatorConfigMapToTracker(configMapResourceName, "mode: enabled")
|
||
|
|
addNodeWithRoleToTracker("control-plane")
|
||
|
|
})
|
||
|
|
|
||
|
|
it("starts the impersonator, then shuts it down, then starts it again", func() {
|
||
|
|
startInformersAndController()
|
||
|
|
|
||
|
|
r.NoError(controllerlib.TestSync(t, subject, *syncContext))
|
||
|
|
requireTLSServerIsRunning()
|
||
|
|
|
||
|
|
updateImpersonatorConfigMapInTracker(configMapResourceName, "mode: disabled", "1")
|
||
|
|
waitForInformerCacheToSeeResourceVersion(kubeInformers.Core().V1().ConfigMaps().Informer(), "1")
|
||
|
|
|
||
|
|
r.NoError(controllerlib.TestSync(t, subject, *syncContext))
|
||
|
|
requireTLSServerIsNoLongerRunning()
|
||
|
|
|
||
|
|
updateImpersonatorConfigMapInTracker(configMapResourceName, "mode: enabled", "2")
|
||
|
|
waitForInformerCacheToSeeResourceVersion(kubeInformers.Core().V1().ConfigMaps().Informer(), "2")
|
||
|
|
|
||
|
|
r.NoError(controllerlib.TestSync(t, subject, *syncContext))
|
||
|
|
requireTLSServerIsRunning()
|
||
|
|
})
|
||
|
|
|
||
|
|
when("there is an error while shutting down the server", func() {
|
||
|
|
it.Before(func() {
|
||
|
|
startTLSListenerUponCloseError = errors.New("fake server close error")
|
||
|
|
})
|
||
|
|
|
||
|
|
it("returns the error from the sync function", func() {
|
||
|
|
startInformersAndController()
|
||
|
|
r.NoError(controllerlib.TestSync(t, subject, *syncContext))
|
||
|
|
requireTLSServerIsRunning()
|
||
|
|
|
||
|
|
updateImpersonatorConfigMapInTracker(configMapResourceName, "mode: disabled", "1")
|
||
|
|
waitForInformerCacheToSeeResourceVersion(kubeInformers.Core().V1().ConfigMaps().Informer(), "1")
|
||
|
|
|
||
|
|
r.EqualError(controllerlib.TestSync(t, subject, *syncContext), "fake server close error")
|
||
|
|
requireTLSServerIsNoLongerRunning()
|
||
|
|
})
|
||
|
|
})
|
||
|
|
})
|
||
|
|
})
|
||
|
|
}, spec.Parallel(), spec.Report(report.Terminal{}))
|
||
|
|
}
|