Add basic e2e test for LimitRange

test/e2e/limit_range.go

+/*
+Copyright 2015 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
+
+import (
+	"fmt"
+
+	"k8s.io/kubernetes/pkg/api"
+	"k8s.io/kubernetes/pkg/api/resource"
+
+	. "github.com/onsi/ginkgo"
+	. "github.com/onsi/gomega"
+)
+
+var _ = Describe("LimitRange", func() {
+	f := NewFramework("limitrange")
+
+	It("should create a LimitRange with defaults and ensure pod has those defaults applied.", func() {
+		By("Creating a LimitRange")
+
+		min := getResourceList("50m", "100Mi")
+		max := getResourceList("500m", "500Mi")
+		defaultLimit := getResourceList("500m", "500Mi")
+		defaultRequest := getResourceList("100m", "200Mi")
+		maxLimitRequestRatio := api.ResourceList{}
+		limitRange := newLimitRange("limit-range", api.LimitTypeContainer,
+			min, max,
+			defaultLimit, defaultRequest,
+			maxLimitRequestRatio)
+		limitRange, err := f.Client.LimitRanges(f.Namespace.Name).Create(limitRange)
+		Expect(err).NotTo(HaveOccurred())
+
+		By("Fetching the LimitRange to ensure it has proper values")
+		limitRange, err = f.Client.LimitRanges(f.Namespace.Name).Get(limitRange.Name)
+		expected := api.ResourceRequirements{Requests: defaultRequest, Limits: defaultLimit}
+		actual := api.ResourceRequirements{Requests: limitRange.Spec.Limits[0].DefaultRequest, Limits: limitRange.Spec.Limits[0].Default}
+		err = equalResourceRequirement(expected, actual)
+		Expect(err).NotTo(HaveOccurred())
+
+		By("Creating a Pod with no resource requirements")
+		pod := newTestPod("pod-no-resources", api.ResourceList{}, api.ResourceList{})
+		pod, err = f.Client.Pods(f.Namespace.Name).Create(pod)
+		Expect(err).NotTo(HaveOccurred())
+
+		By("Ensuring Pod has resource requirements applied from LimitRange")
+		pod, err = f.Client.Pods(f.Namespace.Name).Get(pod.Name)
+		Expect(err).NotTo(HaveOccurred())
+		for i := range pod.Spec.Containers {
+			err = equalResourceRequirement(expected, pod.Spec.Containers[i].Resources)
+			Expect(err).NotTo(HaveOccurred())
+		}
+
+		By("Creating a Pod with partial resource requirements")
+		pod = newTestPod("pod-partial-resources", getResourceList("", "150Mi"), getResourceList("300m", ""))
+		pod, err = f.Client.Pods(f.Namespace.Name).Create(pod)
+		Expect(err).NotTo(HaveOccurred())
+
+		By("Ensuring Pod has merged resource requirements applied from LimitRange")
+		pod, err = f.Client.Pods(f.Namespace.Name).Get(pod.Name)
+		Expect(err).NotTo(HaveOccurred())
+		// This is an interesting case, so it's worth a comment
+		// If you specify a Limit, and no Request, the Limit will default to the Request
+		// This means that the LimitRange.DefaultRequest will ONLY take affect if a container.resources.limit is not supplied
+		expected = api.ResourceRequirements{Requests: getResourceList("300m", "150Mi"), Limits: getResourceList("300m", "500Mi")}
+		for i := range pod.Spec.Containers {
+			err = equalResourceRequirement(expected, pod.Spec.Containers[i].Resources)
+			Expect(err).NotTo(HaveOccurred())
+		}
+
+		By("Failing to create a Pod with less than min resources")
+		pod = newTestPod(podName, getResourceList("10m", "50Mi"), api.ResourceList{})
+		pod, err = f.Client.Pods(f.Namespace.Name).Create(pod)
+		Expect(err).To(HaveOccurred())
+
+		By("Failing to create a Pod with more than max resources")
+		pod = newTestPod(podName, getResourceList("600m", "600Mi"), api.ResourceList{})
+		pod, err = f.Client.Pods(f.Namespace.Name).Create(pod)
+		Expect(err).To(HaveOccurred())
+	})
+
+})
+
+func equalResourceRequirement(expected api.ResourceRequirements, actual api.ResourceRequirements) error {
+	Logf("Verifying requests: expected %s with actual %s", expected.Requests, actual.Requests)
+	err := equalResourceList(expected.Requests, actual.Requests)
+	if err != nil {
+		return err
+	}
+	Logf("Verifying limits: expected %v with actual %v", expected.Limits, actual.Limits)
+	err = equalResourceList(expected.Limits, actual.Limits)
+	if err != nil {
+		return err
+	}
+	return nil
+}
+
+func equalResourceList(expected api.ResourceList, actual api.ResourceList) error {
+	for k, v := range expected {
+		if actualValue, found := actual[k]; !found || (v.Cmp(actualValue) != 0) {
+			return fmt.Errorf("resource %v expected %v actual %v", k, v.String(), actualValue.String())
+		}
+	}
+	for k, v := range actual {
+		if expectedValue, found := expected[k]; !found || (v.Cmp(expectedValue) != 0) {
+			return fmt.Errorf("resource %v expected %v actual %v", k, expectedValue.String(), v.String())
+		}
+	}
+	return nil
+}
+
+func getResourceList(cpu, memory string) api.ResourceList {
+	res := api.ResourceList{}
+	if cpu != "" {
+		res[api.ResourceCPU] = resource.MustParse(cpu)
+	}
+	if memory != "" {
+		res[api.ResourceMemory] = resource.MustParse(memory)
+	}
+	return res
+}
+
+// newLimitRange returns a limit range with specified data
+func newLimitRange(name string, limitType api.LimitType,
+	min, max,
+	defaultLimit, defaultRequest,
+	maxLimitRequestRatio api.ResourceList) *api.LimitRange {
+	return &api.LimitRange{
+		ObjectMeta: api.ObjectMeta{
+			Name: name,
+		},
+		Spec: api.LimitRangeSpec{
+			Limits: []api.LimitRangeItem{
+				{
+					Type:                 limitType,
+					Min:                  min,
+					Max:                  max,
+					Default:              defaultLimit,
+					DefaultRequest:       defaultRequest,
+					MaxLimitRequestRatio: maxLimitRequestRatio,
+				},
+			},
+		},
+	}
+}
+
+// newTestPod returns a pod that has the specified requests and limits
+func newTestPod(name string, requests api.ResourceList, limits api.ResourceList) *api.Pod {
+	return &api.Pod{
+		ObjectMeta: api.ObjectMeta{
+			Name: name,
+		},
+		Spec: api.PodSpec{
+			Containers: []api.Container{
+				{
+					Name:  "nginx",
+					Image: "gcr.io/google_containers/pause:2.0",
+					Resources: api.ResourceRequirements{
+						Requests: requests,
+						Limits:   limits,
+					},
+				},
+			},
+		},
+	}
+}