Add a test for PreStop hooks.

test/e2e/pre_stop.go

+/*
+Copyright 2014 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 (
+	"encoding/json"
+	"fmt"
+	"time"
+
+	"github.com/GoogleCloudPlatform/kubernetes/pkg/api"
+	"github.com/GoogleCloudPlatform/kubernetes/pkg/client"
+	"github.com/GoogleCloudPlatform/kubernetes/pkg/util/wait"
+
+	. "github.com/onsi/ginkgo"
+)
+
+// partially cloned from webserver.go
+type State struct {
+	Received map[string]int
+}
+
+func testPreStop(c *client.Client, ns string) {
+	// This is the server that will receive the preStop notification
+	podDescr := &api.Pod{
+		ObjectMeta: api.ObjectMeta{
+			Name: "server",
+		},
+		Spec: api.PodSpec{
+			Containers: []api.Container{
+				{
+					Name:  "server",
+					Image: "gcr.io/google_containers/nettest:1.3",
+					Ports: []api.ContainerPort{{ContainerPort: 8080}},
+				},
+			},
+		},
+	}
+	By(fmt.Sprintf("Creating server pod %s in namespace %s", podDescr.Name, ns))
+	_, err := c.Pods(ns).Create(podDescr)
+	expectNoError(err, fmt.Sprintf("creating pod %s", podDescr.Name))
+
+	// At the end of the test, clean up by removing the pod.
+	defer func() {
+		By("Deleting the server pod")
+		c.Pods(ns).Delete(podDescr.Name, nil)
+	}()
+
+	By("Waiting for pods to come up.")
+	err = waitForPodRunningInNamespace(c, podDescr.Name, ns)
+	expectNoError(err, "waiting for server pod to start")
+
+	val := "{\"Source\": \"prestop\"}"
+
+	podOut, err := c.Pods(ns).Get(podDescr.Name)
+	expectNoError(err, "getting pod info")
+
+	preStopDescr := &api.Pod{
+		ObjectMeta: api.ObjectMeta{
+			Name: "tester",
+		},
+		Spec: api.PodSpec{
+			Containers: []api.Container{
+				{
+					Name:    "tester",
+					Image:   "busybox",
+					Command: []string{"sleep", "600"},
+					Lifecycle: &api.Lifecycle{
+						PreStop: &api.Handler{
+							Exec: &api.ExecAction{
+								Command: []string{
+									"wget", "-O-", "--post-data=" + val, fmt.Sprintf("http://%s:8080/write", podOut.Status.PodIP),
+								},
+							},
+						},
+					},
+				},
+			},
+		},
+	}
+
+	By(fmt.Sprintf("Creating tester pod %s in namespace %s", podDescr.Name, ns))
+	_, err = c.Pods(ns).Create(preStopDescr)
+	expectNoError(err, fmt.Sprintf("creating pod %s", preStopDescr.Name))
+	deletePreStop := true
+
+	// At the end of the test, clean up by removing the pod.
+	defer func() {
+		if deletePreStop {
+			By("Deleting the tester pod")
+			c.Pods(ns).Delete(preStopDescr.Name, nil)
+		}
+	}()
+
+	err = waitForPodRunningInNamespace(c, preStopDescr.Name, ns)
+	expectNoError(err, "waiting for tester pod to start")
+
+	// Delete the pod with the preStop handler.
+	By("Deleting pre-stop pod")
+	if err := c.Pods(ns).Delete(preStopDescr.Name, nil); err == nil {
+		deletePreStop = false
+	}
+	expectNoError(err, fmt.Sprintf("deleting pod: %s", preStopDescr.Name))
+
+	// Validate that the server received the web poke.
+	err = wait.Poll(time.Second*5, time.Second*60, func() (bool, error) {
+		if body, err := c.Get().
+			Namespace(ns).Prefix("proxy").
+			Resource("pods").
+			Name(podDescr.Name).
+			Suffix("read").
+			DoRaw(); err != nil {
+			By(fmt.Sprintf("Error validating prestop: %v", err))
+		} else {
+			state := State{}
+			err := json.Unmarshal(body, &state)
+			if err != nil {
+				Logf("Error parsing: %v", err)
+				return false, nil
+			}
+			if state.Received["prestop"] != 0 {
+				return true, nil
+			}
+			Logf("Saw: %s", string(body))
+		}
+		return false, nil
+	})
+	expectNoError(err, "validating pre-stop.")
+}
+
+var _ = Describe("PreStop", func() {
+	f := NewFramework("prestop")
+
+	It("should call prestop when killing a pod", func() {
+		testPreStop(f.Client, f.Namespace.Name)
+	})
+})