/*
Copyright 2016 The Kubernetes Authors 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 e2e_node

import (
	"fmt"

	"k8s.io/kubernetes/pkg/api"
	"k8s.io/kubernetes/pkg/api/resource"
	"k8s.io/kubernetes/pkg/util"
	"k8s.io/kubernetes/test/e2e/framework"

	. "github.com/onsi/ginkgo"
)

// Ported from test/e2e/downard_api_test.go

var _ = framework.KubeDescribe("Downward API", func() {
	f := NewDefaultFramework("downward-api")
	It("should provide pod name and namespace as env vars [Conformance]", func() {
		podName := "downward-api-" + string(util.NewUUID())
		env := []api.EnvVar{
			{
				Name: "POD_NAME",
				ValueFrom: &api.EnvVarSource{
					FieldRef: &api.ObjectFieldSelector{
						APIVersion: "v1",
						FieldPath:  "metadata.name",
					},
				},
			},
			{
				Name: "POD_NAMESPACE",
				ValueFrom: &api.EnvVarSource{
					FieldRef: &api.ObjectFieldSelector{
						APIVersion: "v1",
						FieldPath:  "metadata.namespace",
					},
				},
			},
		}

		expectations := []string{
			fmt.Sprintf("POD_NAME=%v", podName),
			fmt.Sprintf("POD_NAMESPACE=%v", f.Namespace.Name),
		}

		testDownwardAPI(f, podName, env, expectations)
	})

	It("should provide pod IP as an env var", func() {
		podName := "downward-api-" + string(util.NewUUID())
		env := []api.EnvVar{
			{
				Name: "POD_IP",
				ValueFrom: &api.EnvVarSource{
					FieldRef: &api.ObjectFieldSelector{
						APIVersion: "v1",
						FieldPath:  "status.podIP",
					},
				},
			},
		}

		expectations := []string{
			"POD_IP=(?:\\d+)\\.(?:\\d+)\\.(?:\\d+)\\.(?:\\d+)",
		}

		testDownwardAPI(f, podName, env, expectations)
	})

	It("should provide container's limits.cpu/memory and requests.cpu/memory as env vars", func() {
		podName := "downward-api-" + string(util.NewUUID())
		env := []api.EnvVar{
			{
				Name: "CPU_LIMIT",
				ValueFrom: &api.EnvVarSource{
					ResourceFieldRef: &api.ResourceFieldSelector{
						Resource: "limits.cpu",
					},
				},
			},
			{
				Name: "MEMORY_LIMIT",
				ValueFrom: &api.EnvVarSource{
					ResourceFieldRef: &api.ResourceFieldSelector{
						Resource: "limits.memory",
					},
				},
			},
			{
				Name: "CPU_REQUEST",
				ValueFrom: &api.EnvVarSource{
					ResourceFieldRef: &api.ResourceFieldSelector{
						Resource: "requests.cpu",
					},
				},
			},
			{
				Name: "MEMORY_REQUEST",
				ValueFrom: &api.EnvVarSource{
					ResourceFieldRef: &api.ResourceFieldSelector{
						Resource: "requests.memory",
					},
				},
			},
		}
		expectations := []string{
			fmt.Sprintf("CPU_LIMIT=2"),
			fmt.Sprintf("MEMORY_LIMIT=67108864"),
			fmt.Sprintf("CPU_REQUEST=1"),
			fmt.Sprintf("MEMORY_REQUEST=33554432"),
		}

		testDownwardAPI(f, podName, env, expectations)
	})
})

func testDownwardAPI(f *framework.Framework, podName string, env []api.EnvVar, expectations []string) {
	pod := &api.Pod{
		ObjectMeta: api.ObjectMeta{
			Name:   podName,
			Labels: map[string]string{"name": podName},
		},
		Spec: api.PodSpec{
			Containers: []api.Container{
				{
					Name:    "dapi-container",
					Image:   "gcr.io/google_containers/busybox:1.24",
					Command: []string{"sh", "-c", "env"},
					Resources: api.ResourceRequirements{
						Requests: api.ResourceList{
							api.ResourceCPU:    resource.MustParse("250m"),
							api.ResourceMemory: resource.MustParse("32Mi"),
						},
						Limits: api.ResourceList{
							api.ResourceCPU:    resource.MustParse("1250m"),
							api.ResourceMemory: resource.MustParse("64Mi"),
						},
					},
					Env: env,
				},
			},
			RestartPolicy: api.RestartPolicyNever,
		},
	}
	assignPodToNode(pod)

	f.TestContainerOutputRegexp("downward api env vars", pod, 0, expectations)
}
