kubernetes/pkg/kubelet/container/helpers_test.go

/*
Copyright 2015 The Kubernetes Authors.

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 container

import (
	"reflect"
	"testing"

	"github.com/stretchr/testify/assert"

	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
	"k8s.io/kubernetes/pkg/api/v1"
)

func TestEnvVarsToMap(t *testing.T) {
	vars := []EnvVar{
		{
			Name:  "foo",
			Value: "bar",
		},
		{
			Name:  "zoo",
			Value: "baz",
		},
	}

	varMap := EnvVarsToMap(vars)

	if e, a := len(vars), len(varMap); e != a {
		t.Errorf("Unexpected map length; expected: %d, got %d", e, a)
	}

	if a := varMap["foo"]; a != "bar" {
		t.Errorf("Unexpected value of key 'foo': %v", a)
	}

	if a := varMap["zoo"]; a != "baz" {
		t.Errorf("Unexpected value of key 'zoo': %v", a)
	}
}

func TestExpandCommandAndArgs(t *testing.T) {
	cases := []struct {
		name            string
		container       *v1.Container
		envs            []EnvVar
		expectedCommand []string
		expectedArgs    []string
	}{
		{
			name:      "none",
			container: &v1.Container{},
		},
		{
			name: "command expanded",
			container: &v1.Container{
				Command: []string{"foo", "$(VAR_TEST)", "$(VAR_TEST2)"},
			},
			envs: []EnvVar{
				{
					Name:  "VAR_TEST",
					Value: "zoo",
				},
				{
					Name:  "VAR_TEST2",
					Value: "boo",
				},
			},
			expectedCommand: []string{"foo", "zoo", "boo"},
		},
		{
			name: "args expanded",
			container: &v1.Container{
				Args: []string{"zap", "$(VAR_TEST)", "$(VAR_TEST2)"},
			},
			envs: []EnvVar{
				{
					Name:  "VAR_TEST",
					Value: "hap",
				},
				{
					Name:  "VAR_TEST2",
					Value: "trap",
				},
			},
			expectedArgs: []string{"zap", "hap", "trap"},
		},
		{
			name: "both expanded",
			container: &v1.Container{
				Command: []string{"$(VAR_TEST2)--$(VAR_TEST)", "foo", "$(VAR_TEST3)"},
				Args:    []string{"foo", "$(VAR_TEST)", "$(VAR_TEST2)"},
			},
			envs: []EnvVar{
				{
					Name:  "VAR_TEST",
					Value: "zoo",
				},
				{
					Name:  "VAR_TEST2",
					Value: "boo",
				},
				{
					Name:  "VAR_TEST3",
					Value: "roo",
				},
			},
			expectedCommand: []string{"boo--zoo", "foo", "roo"},
			expectedArgs:    []string{"foo", "zoo", "boo"},
		},
	}

	for _, tc := range cases {
		actualCommand, actualArgs := ExpandContainerCommandAndArgs(tc.container, tc.envs)

		if e, a := tc.expectedCommand, actualCommand; !reflect.DeepEqual(e, a) {
			t.Errorf("%v: unexpected command; expected %v, got %v", tc.name, e, a)
		}

		if e, a := tc.expectedArgs, actualArgs; !reflect.DeepEqual(e, a) {
			t.Errorf("%v: unexpected args; expected %v, got %v", tc.name, e, a)
		}

	}
}

func TestShouldContainerBeRestarted(t *testing.T) {
	pod := &v1.Pod{
		ObjectMeta: metav1.ObjectMeta{
			UID:       "12345678",
			Name:      "foo",
			Namespace: "new",
		},
		Spec: v1.PodSpec{
			Containers: []v1.Container{
				{Name: "no-history"},
				{Name: "alive"},
				{Name: "succeed"},
				{Name: "failed"},
				{Name: "unknown"},
			},
		},
	}
	podStatus := &PodStatus{
		ID:        pod.UID,
		Name:      pod.Name,
		Namespace: pod.Namespace,
		ContainerStatuses: []*ContainerStatus{
			{
				Name:  "alive",
				State: ContainerStateRunning,
			},
			{
				Name:     "succeed",
				State:    ContainerStateExited,
				ExitCode: 0,
			},
			{
				Name:     "failed",
				State:    ContainerStateExited,
				ExitCode: 1,
			},
			{
				Name:     "alive",
				State:    ContainerStateExited,
				ExitCode: 2,
			},
			{
				Name:  "unknown",
				State: ContainerStateUnknown,
			},
			{
				Name:     "failed",
				State:    ContainerStateExited,
				ExitCode: 3,
			},
		},
	}
	policies := []v1.RestartPolicy{
		v1.RestartPolicyNever,
		v1.RestartPolicyOnFailure,
		v1.RestartPolicyAlways,
	}
	expected := map[string][]bool{
		"no-history": {true, true, true},
		"alive":      {false, false, false},
		"succeed":    {false, false, true},
		"failed":     {false, true, true},
		"unknown":    {true, true, true},
	}
	for _, c := range pod.Spec.Containers {
		for i, policy := range policies {
			pod.Spec.RestartPolicy = policy
			e := expected[c.Name][i]
			r := ShouldContainerBeRestarted(&c, pod, podStatus)
			if r != e {
				t.Errorf("Restart for container %q with restart policy %q expected %t, got %t",
					c.Name, policy, e, r)
			}
		}
	}
}

func TestHasPrivilegedContainer(t *testing.T) {
	newBoolPtr := func(b bool) *bool {
		return &b
	}
	tests := map[string]struct {
		securityContext *v1.SecurityContext
		expected        bool
	}{
		"nil security context": {
			securityContext: nil,
			expected:        false,
		},
		"nil privileged": {
			securityContext: &v1.SecurityContext{},
			expected:        false,
		},
		"false privileged": {
			securityContext: &v1.SecurityContext{Privileged: newBoolPtr(false)},
			expected:        false,
		},
		"true privileged": {
			securityContext: &v1.SecurityContext{Privileged: newBoolPtr(true)},
			expected:        true,
		},
	}

	for k, v := range tests {
		pod := &v1.Pod{
			Spec: v1.PodSpec{
				Containers: []v1.Container{
					{SecurityContext: v.securityContext},
				},
			},
		}
		actual := HasPrivilegedContainer(pod)
		if actual != v.expected {
			t.Errorf("%s expected %t but got %t", k, v.expected, actual)
		}
	}
}

func TestMakePortMappings(t *testing.T) {
	port := func(name string, protocol v1.Protocol, containerPort, hostPort int32, ip string) v1.ContainerPort {
		return v1.ContainerPort{
			Name:          name,
			Protocol:      protocol,
			ContainerPort: containerPort,
			HostPort:      hostPort,
			HostIP:        ip,
		}
	}
	portMapping := func(name string, protocol v1.Protocol, containerPort, hostPort int, ip string) PortMapping {
		return PortMapping{
			Name:          name,
			Protocol:      protocol,
			ContainerPort: containerPort,
			HostPort:      hostPort,
			HostIP:        ip,
		}
	}

	tests := []struct {
		container            *v1.Container
		expectedPortMappings []PortMapping
	}{
		{
			&v1.Container{
				Name: "fooContainer",
				Ports: []v1.ContainerPort{
					port("", v1.ProtocolTCP, 80, 8080, "127.0.0.1"),
					port("", v1.ProtocolTCP, 443, 4343, "192.168.0.1"),
					port("foo", v1.ProtocolUDP, 555, 5555, ""),
					// Duplicated, should be ignored.
					port("foo", v1.ProtocolUDP, 888, 8888, ""),
					// Duplicated, should be ignored.
					port("", v1.ProtocolTCP, 80, 8888, ""),
				},
			},
			[]PortMapping{
				portMapping("fooContainer-TCP:80", v1.ProtocolTCP, 80, 8080, "127.0.0.1"),
				portMapping("fooContainer-TCP:443", v1.ProtocolTCP, 443, 4343, "192.168.0.1"),
				portMapping("fooContainer-foo", v1.ProtocolUDP, 555, 5555, ""),
			},
		},
	}

	for i, tt := range tests {
		actual := MakePortMappings(tt.container)
		assert.Equal(t, tt.expectedPortMappings, actual, "[%d]", i)
	}
}