kubernetes/pkg/kubelet/dockertools/docker_test.go

/*
Copyright 2014 Google Inc. All rights reserved.

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/

package dockertools

import (
	"fmt"
	"hash/adler32"
	"reflect"
	"sort"
	"testing"

	"github.com/GoogleCloudPlatform/kubernetes/pkg/api"
	"github.com/GoogleCloudPlatform/kubernetes/pkg/client/record"
	"github.com/GoogleCloudPlatform/kubernetes/pkg/credentialprovider"
	kubecontainer "github.com/GoogleCloudPlatform/kubernetes/pkg/kubelet/container"
	"github.com/GoogleCloudPlatform/kubernetes/pkg/kubelet/network"
	kubeletProber "github.com/GoogleCloudPlatform/kubernetes/pkg/kubelet/prober"
	"github.com/GoogleCloudPlatform/kubernetes/pkg/types"
	"github.com/GoogleCloudPlatform/kubernetes/pkg/util"
	docker "github.com/fsouza/go-dockerclient"
)

func verifyCalls(t *testing.T, fakeDocker *FakeDockerClient, calls []string) {
	fakeDocker.Lock()
	defer fakeDocker.Unlock()
	verifyStringArrayEquals(t, fakeDocker.called, calls)
}

func verifyStringArrayEquals(t *testing.T, actual, expected []string) {
	invalid := len(actual) != len(expected)
	if !invalid {
		for ix, value := range actual {
			if expected[ix] != value {
				invalid = true
			}
		}
	}
	if invalid {
		t.Errorf("Expected: %#v, Actual: %#v", expected, actual)
	}
}

func TestGetContainerID(t *testing.T) {
	fakeDocker := &FakeDockerClient{}
	fakeDocker.ContainerList = []docker.APIContainers{
		{
			ID:    "foobar",
			Names: []string{"/k8s_foo_qux_ns_1234_42"},
		},
		{
			ID:    "barbar",
			Names: []string{"/k8s_bar_qux_ns_2565_42"},
		},
	}
	fakeDocker.Container = &docker.Container{
		ID: "foobar",
	}

	dockerContainers, err := GetKubeletDockerContainers(fakeDocker, false)
	if err != nil {
		t.Errorf("Expected no error, Got %#v", err)
	}
	if len(dockerContainers) != 2 {
		t.Errorf("Expected %#v, Got %#v", fakeDocker.ContainerList, dockerContainers)
	}
	verifyCalls(t, fakeDocker, []string{"list"})
	dockerContainer, found, _ := dockerContainers.FindPodContainer("qux_ns", "", "foo")
	if dockerContainer == nil || !found {
		t.Errorf("Failed to find container %#v", dockerContainer)
	}

	fakeDocker.ClearCalls()
	dockerContainer, found, _ = dockerContainers.FindPodContainer("foobar", "", "foo")
	verifyCalls(t, fakeDocker, []string{})
	if dockerContainer != nil || found {
		t.Errorf("Should not have found container %#v", dockerContainer)
	}
}

func verifyPackUnpack(t *testing.T, podNamespace, podUID, podName, containerName string) {
	container := &api.Container{Name: containerName}
	hasher := adler32.New()
	util.DeepHashObject(hasher, *container)
	computedHash := uint64(hasher.Sum32())
	podFullName := fmt.Sprintf("%s_%s", podName, podNamespace)
	name := BuildDockerName(KubeletContainerName{podFullName, types.UID(podUID), container.Name}, container)
	returned, hash, err := ParseDockerName(name)
	if err != nil {
		t.Errorf("Failed to parse Docker container name %q: %v", name, err)
	}
	if podFullName != returned.PodFullName || podUID != string(returned.PodUID) || containerName != returned.ContainerName || computedHash != hash {
		t.Errorf("For (%s, %s, %s, %d), unpacked (%s, %s, %s, %d)", podFullName, podUID, containerName, computedHash, returned.PodFullName, returned.PodUID, returned.ContainerName, hash)
	}
}

func TestContainerManifestNaming(t *testing.T) {
	podUID := "12345678"
	verifyPackUnpack(t, "file", podUID, "name", "container")
	verifyPackUnpack(t, "file", podUID, "name-with-dashes", "container")
	// UID is same as pod name
	verifyPackUnpack(t, "file", podUID, podUID, "container")
	// No Container name
	verifyPackUnpack(t, "other", podUID, "name", "")

	container := &api.Container{Name: "container"}
	podName := "foo"
	podNamespace := "test"
	name := fmt.Sprintf("k8s_%s_%s_%s_%s_42", container.Name, podName, podNamespace, podUID)
	podFullName := fmt.Sprintf("%s_%s", podName, podNamespace)

	returned, hash, err := ParseDockerName(name)
	if err != nil {
		t.Errorf("Failed to parse Docker container name %q: %v", name, err)
	}
	if returned.PodFullName != podFullName || string(returned.PodUID) != podUID || returned.ContainerName != container.Name || hash != 0 {
		t.Errorf("unexpected parse: %s %s %s %d", returned.PodFullName, returned.PodUID, returned.ContainerName, hash)
	}
}

func TestVersion(t *testing.T) {
	fakeDocker := &FakeDockerClient{VersionInfo: docker.Env{"Version=1.1.3", "ApiVersion=1.15"}}
	manager := &DockerManager{client: fakeDocker}
	version, err := manager.Version()
	if err != nil {
		t.Errorf("got error while getting docker server version - %s", err)
	}
	expectedVersion, _ := docker.NewAPIVersion("1.15")
	if e, a := expectedVersion.String(), version.String(); e != a {
		t.Errorf("invalid docker server version. expected: %v, got: %v", e, a)
	}
}

func TestExecSupportExists(t *testing.T) {
	fakeDocker := &FakeDockerClient{VersionInfo: docker.Env{"Version=1.3.0", "ApiVersion=1.15"}}
	runner := &DockerManager{client: fakeDocker}
	useNativeExec, err := runner.nativeExecSupportExists()
	if err != nil {
		t.Errorf("got error while checking for exec support - %s", err)
	}
	if !useNativeExec {
		t.Errorf("invalid exec support check output. Expected true")
	}
}

func TestExecSupportNotExists(t *testing.T) {
	fakeDocker := &FakeDockerClient{VersionInfo: docker.Env{"Version=1.1.2", "ApiVersion=1.14"}}
	runner := &DockerManager{client: fakeDocker}
	useNativeExec, _ := runner.nativeExecSupportExists()
	if useNativeExec {
		t.Errorf("invalid exec support check output.")
	}
}

func TestDockerContainerCommand(t *testing.T) {
	runner := &DockerManager{}
	containerID := "1234"
	command := []string{"ls"}
	cmd, _ := runner.getRunInContainerCommand(containerID, command)
	if cmd.Dir != "/var/lib/docker/execdriver/native/"+containerID {
		t.Errorf("unexpected command CWD: %s", cmd.Dir)
	}
	if !reflect.DeepEqual(cmd.Args, []string{"/usr/sbin/nsinit", "exec", "ls"}) {
		t.Errorf("unexpected command args: %s", cmd.Args)
	}
}
func TestParseImageName(t *testing.T) {
	tests := []struct {
		imageName string
		name      string
		tag       string
	}{
		{"ubuntu", "ubuntu", ""},
		{"ubuntu:2342", "ubuntu", "2342"},
		{"ubuntu:latest", "ubuntu", "latest"},
		{"foo/bar:445566", "foo/bar", "445566"},
		{"registry.example.com:5000/foobar", "registry.example.com:5000/foobar", ""},
		{"registry.example.com:5000/foobar:5342", "registry.example.com:5000/foobar", "5342"},
		{"registry.example.com:5000/foobar:latest", "registry.example.com:5000/foobar", "latest"},
	}
	for _, test := range tests {
		name, tag := parseImageName(test.imageName)
		if name != test.name || tag != test.tag {
			t.Errorf("Expected name/tag: %s/%s, got %s/%s", test.name, test.tag, name, tag)
		}
	}
}

func TestPull(t *testing.T) {
	tests := []struct {
		imageName     string
		expectedImage string
	}{
		{"ubuntu", "ubuntu:latest"},
		{"ubuntu:2342", "ubuntu:2342"},
		{"ubuntu:latest", "ubuntu:latest"},
		{"foo/bar:445566", "foo/bar:445566"},
		{"registry.example.com:5000/foobar", "registry.example.com:5000/foobar:latest"},
		{"registry.example.com:5000/foobar:5342", "registry.example.com:5000/foobar:5342"},
		{"registry.example.com:5000/foobar:latest", "registry.example.com:5000/foobar:latest"},
	}
	for _, test := range tests {
		fakeKeyring := &credentialprovider.FakeKeyring{}
		fakeClient := &FakeDockerClient{}

		dp := dockerPuller{
			client:  fakeClient,
			keyring: fakeKeyring,
		}

		err := dp.Pull(test.imageName)
		if err != nil {
			t.Errorf("unexpected non-nil err: %s", err)
			continue
		}

		if e, a := 1, len(fakeClient.pulled); e != a {
			t.Errorf("%s: expected 1 pulled image, got %d: %v", test.imageName, a, fakeClient.pulled)
			continue
		}

		if e, a := test.expectedImage, fakeClient.pulled[0]; e != a {
			t.Errorf("%s: expected pull of %q, but got %q", test.imageName, e, a)
		}
	}
}

func TestDockerKeyringLookupFails(t *testing.T) {
	fakeKeyring := &credentialprovider.FakeKeyring{}
	fakeClient := &FakeDockerClient{
		Errors: map[string]error{"pull": fmt.Errorf("test error")},
	}

	dp := dockerPuller{
		client:  fakeClient,
		keyring: fakeKeyring,
	}

	err := dp.Pull("host/repository/image:version")
	if err == nil {
		t.Errorf("unexpected non-error")
	}
	msg := "image pull failed for host/repository/image:version, this may be because there are no credentials on this request.  details: (test error)"
	if err.Error() != msg {
		t.Errorf("expected: %s, saw: %s", msg, err.Error())
	}
}

func TestDockerKeyringLookup(t *testing.T) {
	empty := docker.AuthConfiguration{}

	ada := docker.AuthConfiguration{
		Username: "ada",
		Password: "smash",
		Email:    "ada@example.com",
	}

	grace := docker.AuthConfiguration{
		Username: "grace",
		Password: "squash",
		Email:    "grace@example.com",
	}

	dk := &credentialprovider.BasicDockerKeyring{}
	dk.Add(credentialprovider.DockerConfig{
		"bar.example.com/pong": credentialprovider.DockerConfigEntry{
			Username: grace.Username,
			Password: grace.Password,
			Email:    grace.Email,
		},
		"bar.example.com": credentialprovider.DockerConfigEntry{
			Username: ada.Username,
			Password: ada.Password,
			Email:    ada.Email,
		},
	})

	tests := []struct {
		image string
		match docker.AuthConfiguration
		ok    bool
	}{
		// direct match
		{"bar.example.com", ada, true},

		// direct match deeper than other possible matches
		{"bar.example.com/pong", grace, true},

		// no direct match, deeper path ignored
		{"bar.example.com/ping", ada, true},

		// match first part of path token
		{"bar.example.com/pongz", grace, true},

		// match regardless of sub-path
		{"bar.example.com/pong/pang", grace, true},

		// no host match
		{"example.com", empty, false},
		{"foo.example.com", empty, false},
	}

	for i, tt := range tests {
		match, ok := dk.Lookup(tt.image)
		if tt.ok != ok {
			t.Errorf("case %d: expected ok=%t, got %t", i, tt.ok, ok)
		}

		if !reflect.DeepEqual(tt.match, match) {
			t.Errorf("case %d: expected match=%#v, got %#v", i, tt.match, match)
		}
	}
}

// This validates that dockercfg entries with a scheme and url path are properly matched
// by images that only match the hostname.
// NOTE: the above covers the case of a more specific match trumping just hostname.
func TestIssue3797(t *testing.T) {
	rex := docker.AuthConfiguration{
		Username: "rex",
		Password: "tiny arms",
		Email:    "rex@example.com",
	}

	dk := &credentialprovider.BasicDockerKeyring{}
	dk.Add(credentialprovider.DockerConfig{
		"https://quay.io/v1/": credentialprovider.DockerConfigEntry{
			Username: rex.Username,
			Password: rex.Password,
			Email:    rex.Email,
		},
	})

	tests := []struct {
		image string
		match docker.AuthConfiguration
		ok    bool
	}{
		// direct match
		{"quay.io", rex, true},

		// partial matches
		{"quay.io/foo", rex, true},
		{"quay.io/foo/bar", rex, true},
	}

	for i, tt := range tests {
		match, ok := dk.Lookup(tt.image)
		if tt.ok != ok {
			t.Errorf("case %d: expected ok=%t, got %t", i, tt.ok, ok)
		}

		if !reflect.DeepEqual(tt.match, match) {
			t.Errorf("case %d: expected match=%#v, got %#v", i, tt.match, match)
		}
	}
}

type imageTrackingDockerClient struct {
	*FakeDockerClient
	imageName string
}

func (f *imageTrackingDockerClient) InspectImage(name string) (image *docker.Image, err error) {
	image, err = f.FakeDockerClient.InspectImage(name)
	f.imageName = name
	return
}

func TestIsImagePresent(t *testing.T) {
	cl := &imageTrackingDockerClient{&FakeDockerClient{}, ""}
	puller := &dockerPuller{
		client: cl,
	}
	_, _ = puller.IsImagePresent("abc:123")
	if cl.imageName != "abc:123" {
		t.Errorf("expected inspection of image abc:123, instead inspected image %v", cl.imageName)
	}
}

type podsByID []*kubecontainer.Pod

func (b podsByID) Len() int           { return len(b) }
func (b podsByID) Swap(i, j int)      { b[i], b[j] = b[j], b[i] }
func (b podsByID) Less(i, j int) bool { return b[i].ID < b[j].ID }

type containersByID []*kubecontainer.Container

func (b containersByID) Len() int           { return len(b) }
func (b containersByID) Swap(i, j int)      { b[i], b[j] = b[j], b[i] }
func (b containersByID) Less(i, j int) bool { return b[i].ID < b[j].ID }

func TestFindContainersByPod(t *testing.T) {
	tests := []struct {
		containerList       []docker.APIContainers
		exitedContainerList []docker.APIContainers
		all                 bool
		expectedPods        []*kubecontainer.Pod
	}{

		{
			[]docker.APIContainers{
				{
					ID:    "foobar",
					Names: []string{"/k8s_foobar.1234_qux_ns_1234_42"},
				},
				{
					ID:    "barbar",
					Names: []string{"/k8s_barbar.1234_qux_ns_2343_42"},
				},
				{
					ID:    "baz",
					Names: []string{"/k8s_baz.1234_qux_ns_1234_42"},
				},
			},
			[]docker.APIContainers{
				{
					ID:    "barfoo",
					Names: []string{"/k8s_barfoo.1234_qux_ns_1234_42"},
				},
				{
					ID:    "bazbaz",
					Names: []string{"/k8s_bazbaz.1234_qux_ns_5678_42"},
				},
			},
			false,
			[]*kubecontainer.Pod{
				{
					ID:        "1234",
					Name:      "qux",
					Namespace: "ns",
					Containers: []*kubecontainer.Container{
						{
							ID:   "foobar",
							Name: "foobar",
							Hash: 0x1234,
						},
						{
							ID:   "baz",
							Name: "baz",
							Hash: 0x1234,
						},
					},
				},
				{
					ID:        "2343",
					Name:      "qux",
					Namespace: "ns",
					Containers: []*kubecontainer.Container{
						{
							ID:   "barbar",
							Name: "barbar",
							Hash: 0x1234,
						},
					},
				},
			},
		},
		{
			[]docker.APIContainers{
				{
					ID:    "foobar",
					Names: []string{"/k8s_foobar.1234_qux_ns_1234_42"},
				},
				{
					ID:    "barbar",
					Names: []string{"/k8s_barbar.1234_qux_ns_2343_42"},
				},
				{
					ID:    "baz",
					Names: []string{"/k8s_baz.1234_qux_ns_1234_42"},
				},
			},
			[]docker.APIContainers{
				{
					ID:    "barfoo",
					Names: []string{"/k8s_barfoo.1234_qux_ns_1234_42"},
				},
				{
					ID:    "bazbaz",
					Names: []string{"/k8s_bazbaz.1234_qux_ns_5678_42"},
				},
			},
			true,
			[]*kubecontainer.Pod{
				{
					ID:        "1234",
					Name:      "qux",
					Namespace: "ns",
					Containers: []*kubecontainer.Container{
						{
							ID:   "foobar",
							Name: "foobar",
							Hash: 0x1234,
						},
						{
							ID:   "barfoo",
							Name: "barfoo",
							Hash: 0x1234,
						},
						{
							ID:   "baz",
							Name: "baz",
							Hash: 0x1234,
						},
					},
				},
				{
					ID:        "2343",
					Name:      "qux",
					Namespace: "ns",
					Containers: []*kubecontainer.Container{
						{
							ID:   "barbar",
							Name: "barbar",
							Hash: 0x1234,
						},
					},
				},
				{
					ID:        "5678",
					Name:      "qux",
					Namespace: "ns",
					Containers: []*kubecontainer.Container{
						{
							ID:   "bazbaz",
							Name: "bazbaz",
							Hash: 0x1234,
						},
					},
				},
			},
		},
		{
			[]docker.APIContainers{},
			[]docker.APIContainers{},
			true,
			nil,
		},
	}
	fakeClient := &FakeDockerClient{}
	np, _ := network.InitNetworkPlugin([]network.NetworkPlugin{}, "", network.NewFakeHost(nil))
	containerManager := NewDockerManager(fakeClient, &record.FakeRecorder{}, nil, nil, PodInfraContainerImage, 0, 0, "", kubecontainer.FakeOS{}, np, &kubeletProber.FakeProber{})
	for i, test := range tests {
		fakeClient.ContainerList = test.containerList
		fakeClient.ExitedContainerList = test.exitedContainerList

		result, _ := containerManager.GetPods(test.all)
		for i := range result {
			sort.Sort(containersByID(result[i].Containers))
		}
		for i := range test.expectedPods {
			sort.Sort(containersByID(test.expectedPods[i].Containers))
		}
		sort.Sort(podsByID(result))
		sort.Sort(podsByID(test.expectedPods))
		if !reflect.DeepEqual(test.expectedPods, result) {
			t.Errorf("%d: expected: %#v, saw: %#v", i, test.expectedPods, result)
		}
	}
}

func TestMakePortsAndBindings(t *testing.T) {
	container := api.Container{
		Ports: []api.ContainerPort{
			{
				ContainerPort: 80,
				HostPort:      8080,
				HostIP:        "127.0.0.1",
			},
			{
				ContainerPort: 443,
				HostPort:      443,
				Protocol:      "tcp",
			},
			{
				ContainerPort: 444,
				HostPort:      444,
				Protocol:      "udp",
			},
			{
				ContainerPort: 445,
				HostPort:      445,
				Protocol:      "foobar",
			},
		},
	}
	exposedPorts, bindings := makePortsAndBindings(&container)
	if len(container.Ports) != len(exposedPorts) ||
		len(container.Ports) != len(bindings) {
		t.Errorf("Unexpected ports and bindings, %#v %#v %#v", container, exposedPorts, bindings)
	}
	for key, value := range bindings {
		switch value[0].HostPort {
		case "8080":
			if !reflect.DeepEqual(docker.Port("80/tcp"), key) {
				t.Errorf("Unexpected docker port: %#v", key)
			}
			if value[0].HostIP != "127.0.0.1" {
				t.Errorf("Unexpected host IP: %s", value[0].HostIP)
			}
		case "443":
			if !reflect.DeepEqual(docker.Port("443/tcp"), key) {
				t.Errorf("Unexpected docker port: %#v", key)
			}
			if value[0].HostIP != "" {
				t.Errorf("Unexpected host IP: %s", value[0].HostIP)
			}
		case "444":
			if !reflect.DeepEqual(docker.Port("444/udp"), key) {
				t.Errorf("Unexpected docker port: %#v", key)
			}
			if value[0].HostIP != "" {
				t.Errorf("Unexpected host IP: %s", value[0].HostIP)
			}
		case "445":
			if !reflect.DeepEqual(docker.Port("445/tcp"), key) {
				t.Errorf("Unexpected docker port: %#v", key)
			}
			if value[0].HostIP != "" {
				t.Errorf("Unexpected host IP: %s", value[0].HostIP)
			}
		}
	}
}