/*
Copyright 2019 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 node

import (
	"context"
	"fmt"
	"k8s.io/pod-security-admission/api"

	v1 "k8s.io/api/core/v1"
	nodev1 "k8s.io/api/node/v1"
	apierrors "k8s.io/apimachinery/pkg/api/errors"
	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
	"k8s.io/apimachinery/pkg/util/uuid"
	runtimeclasstest "k8s.io/kubernetes/pkg/kubelet/runtimeclass/testing"
	"k8s.io/kubernetes/test/e2e/framework"
	e2enode "k8s.io/kubernetes/test/e2e/framework/node"
	e2epod "k8s.io/kubernetes/test/e2e/framework/pod"
	e2eskipper "k8s.io/kubernetes/test/e2e/framework/skipper"
	"k8s.io/kubernetes/test/e2e/scheduling"

	"github.com/onsi/ginkgo"
	"github.com/onsi/gomega"
)

var _ = SIGDescribe("RuntimeClass", func() {
	f := framework.NewDefaultFramework("runtimeclass")
	f.NamespacePodSecurityEnforceLevel = api.LevelBaseline

	ginkgo.It("should reject a Pod requesting a RuntimeClass with conflicting node selector", func() {
		labelFooName := "foo-" + string(uuid.NewUUID())

		scheduling := &nodev1.Scheduling{
			NodeSelector: map[string]string{
				labelFooName: "conflict",
			},
		}

		runtimeClass := newRuntimeClass(f.Namespace.Name, "conflict-runtimeclass")
		runtimeClass.Scheduling = scheduling
		rc, err := f.ClientSet.NodeV1().RuntimeClasses().Create(context.TODO(), runtimeClass, metav1.CreateOptions{})
		framework.ExpectNoError(err, "failed to create RuntimeClass resource")

		pod := e2enode.NewRuntimeClassPod(rc.GetName())
		pod.Spec.NodeSelector = map[string]string{
			labelFooName: "bar",
		}
		_, err = f.ClientSet.CoreV1().Pods(f.Namespace.Name).Create(context.TODO(), pod, metav1.CreateOptions{})
		if !apierrors.IsForbidden(err) {
			framework.Failf("expected 'forbidden' as error, got instead: %v", err)
		}
	})

	ginkgo.It("should run a Pod requesting a RuntimeClass with scheduling with taints [Serial] ", func() {
		labelFooName := "foo-" + string(uuid.NewUUID())
		labelFizzName := "fizz-" + string(uuid.NewUUID())

		nodeName := scheduling.GetNodeThatCanRunPod(f)
		nodeSelector := map[string]string{
			labelFooName:  "bar",
			labelFizzName: "buzz",
		}
		tolerations := []v1.Toleration{
			{
				Key:      labelFooName,
				Operator: v1.TolerationOpEqual,
				Value:    "bar",
				Effect:   v1.TaintEffectNoSchedule,
			},
		}
		scheduling := &nodev1.Scheduling{
			NodeSelector: nodeSelector,
			Tolerations:  tolerations,
		}

		ginkgo.By("Trying to apply a label on the found node.")
		for key, value := range nodeSelector {
			framework.AddOrUpdateLabelOnNode(f.ClientSet, nodeName, key, value)
			framework.ExpectNodeHasLabel(f.ClientSet, nodeName, key, value)
			defer framework.RemoveLabelOffNode(f.ClientSet, nodeName, key)
		}

		ginkgo.By("Trying to apply taint on the found node.")
		taint := v1.Taint{
			Key:    labelFooName,
			Value:  "bar",
			Effect: v1.TaintEffectNoSchedule,
		}
		e2enode.AddOrUpdateTaintOnNode(f.ClientSet, nodeName, taint)
		framework.ExpectNodeHasTaint(f.ClientSet, nodeName, &taint)
		defer e2enode.RemoveTaintOffNode(f.ClientSet, nodeName, taint)

		ginkgo.By("Trying to create runtimeclass and pod")
		runtimeClass := newRuntimeClass(f.Namespace.Name, "non-conflict-runtimeclass")
		runtimeClass.Scheduling = scheduling
		rc, err := f.ClientSet.NodeV1().RuntimeClasses().Create(context.TODO(), runtimeClass, metav1.CreateOptions{})
		framework.ExpectNoError(err, "failed to create RuntimeClass resource")

		pod := e2enode.NewRuntimeClassPod(rc.GetName())
		pod.Spec.NodeSelector = map[string]string{
			labelFooName: "bar",
		}
		pod = f.PodClient().Create(pod)

		framework.ExpectNoError(e2epod.WaitForPodNotPending(f.ClientSet, f.Namespace.Name, pod.Name))

		// check that pod got scheduled on specified node.
		scheduledPod, err := f.ClientSet.CoreV1().Pods(f.Namespace.Name).Get(context.TODO(), pod.Name, metav1.GetOptions{})
		framework.ExpectNoError(err)
		framework.ExpectEqual(nodeName, scheduledPod.Spec.NodeName)
		framework.ExpectEqual(nodeSelector, pod.Spec.NodeSelector)
		gomega.Expect(pod.Spec.Tolerations).To(gomega.ContainElement(tolerations[0]))
	})

	ginkgo.It("should run a Pod requesting a RuntimeClass with scheduling without taints ", func() {
		// Requires special setup of test-handler which is only done in GCE kube-up environment
		// see https://github.com/kubernetes/kubernetes/blob/eb729620c522753bc7ae61fc2c7b7ea19d4aad2f/cluster/gce/gci/configure-helper.sh#L3069-L3076
		e2eskipper.SkipUnlessProviderIs("gce")

		labelFooName := "foo-" + string(uuid.NewUUID())
		labelFizzName := "fizz-" + string(uuid.NewUUID())

		nodeName := scheduling.GetNodeThatCanRunPod(f)
		nodeSelector := map[string]string{
			labelFooName:  "bar",
			labelFizzName: "buzz",
		}
		scheduling := &nodev1.Scheduling{
			NodeSelector: nodeSelector,
		}

		ginkgo.By("Trying to apply a label on the found node.")
		for key, value := range nodeSelector {
			framework.AddOrUpdateLabelOnNode(f.ClientSet, nodeName, key, value)
			framework.ExpectNodeHasLabel(f.ClientSet, nodeName, key, value)
			defer framework.RemoveLabelOffNode(f.ClientSet, nodeName, key)
		}

		ginkgo.By("Trying to create runtimeclass and pod")
		runtimeClass := newRuntimeClass(f.Namespace.Name, "non-conflict-runtimeclass")
		runtimeClass.Scheduling = scheduling
		rc, err := f.ClientSet.NodeV1().RuntimeClasses().Create(context.TODO(), runtimeClass, metav1.CreateOptions{})
		framework.ExpectNoError(err, "failed to create RuntimeClass resource")

		pod := e2enode.NewRuntimeClassPod(rc.GetName())
		pod.Spec.NodeSelector = map[string]string{
			labelFooName: "bar",
		}
		pod = f.PodClient().Create(pod)

		framework.ExpectNoError(e2epod.WaitForPodNotPending(f.ClientSet, f.Namespace.Name, pod.Name))

		// check that pod got scheduled on specified node.
		scheduledPod, err := f.ClientSet.CoreV1().Pods(f.Namespace.Name).Get(context.TODO(), pod.Name, metav1.GetOptions{})
		framework.ExpectNoError(err)
		framework.ExpectEqual(nodeName, scheduledPod.Spec.NodeName)
		framework.ExpectEqual(nodeSelector, pod.Spec.NodeSelector)
	})
})

// newRuntimeClass returns a test runtime class.
func newRuntimeClass(namespace, name string) *nodev1.RuntimeClass {
	uniqueName := fmt.Sprintf("%s-%s", namespace, name)
	return runtimeclasstest.NewRuntimeClass(uniqueName, e2enode.PreconfiguredRuntimeClassHandler)
}