414 lines
13 KiB
Go
414 lines
13 KiB
Go
/*
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Copyright 2015 The Kubernetes Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package e2e
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import (
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"fmt"
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"io"
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"io/ioutil"
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"net"
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"os/exec"
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"regexp"
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"strconv"
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"strings"
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"syscall"
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"time"
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metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
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"k8s.io/apimachinery/pkg/util/wait"
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"k8s.io/kubernetes/pkg/api/v1"
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utilversion "k8s.io/kubernetes/pkg/util/version"
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"k8s.io/kubernetes/test/e2e/framework"
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testutils "k8s.io/kubernetes/test/utils"
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. "github.com/onsi/ginkgo"
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)
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const (
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podName = "pfpod"
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)
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// TODO support other ports besides 80
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var (
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portForwardRegexp = regexp.MustCompile("Forwarding from 127.0.0.1:([0-9]+) -> 80")
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portForwardPortToStdOutV = utilversion.MustParseSemantic("v1.3.0-alpha.4")
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)
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func pfPod(expectedClientData, chunks, chunkSize, chunkIntervalMillis string, bindAddress string) *v1.Pod {
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return &v1.Pod{
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ObjectMeta: metav1.ObjectMeta{
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Name: podName,
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Labels: map[string]string{"name": podName},
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},
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Spec: v1.PodSpec{
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Containers: []v1.Container{
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{
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Name: "readiness",
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Image: "gcr.io/google_containers/netexec:1.7",
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ReadinessProbe: &v1.Probe{
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Handler: v1.Handler{
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Exec: &v1.ExecAction{
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Command: []string{
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"sh", "-c", "netstat -na | grep LISTEN | grep -v 8080 | grep 80",
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}},
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},
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InitialDelaySeconds: 5,
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TimeoutSeconds: 60,
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PeriodSeconds: 1,
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},
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},
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{
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Name: "portforwardtester",
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Image: "gcr.io/google_containers/portforwardtester:1.2",
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Env: []v1.EnvVar{
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{
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Name: "BIND_PORT",
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Value: "80",
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},
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{
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Name: "EXPECTED_CLIENT_DATA",
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Value: expectedClientData,
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},
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{
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Name: "CHUNKS",
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Value: chunks,
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},
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{
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Name: "CHUNK_SIZE",
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Value: chunkSize,
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},
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{
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Name: "CHUNK_INTERVAL",
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Value: chunkIntervalMillis,
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},
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{
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Name: "BIND_ADDRESS",
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Value: bindAddress,
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},
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},
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},
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},
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RestartPolicy: v1.RestartPolicyNever,
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},
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}
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}
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func WaitForTerminatedContainer(f *framework.Framework, pod *v1.Pod, containerName string) error {
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return framework.WaitForPodCondition(f.ClientSet, f.Namespace.Name, pod.Name, "container terminated", framework.PodStartTimeout, func(pod *v1.Pod) (bool, error) {
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if len(testutils.TerminatedContainers(pod)[containerName]) > 0 {
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return true, nil
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}
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return false, nil
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})
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}
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type portForwardCommand struct {
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cmd *exec.Cmd
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port int
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}
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// Stop attempts to gracefully stop `kubectl port-forward`, only killing it if necessary.
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// This helps avoid spdy goroutine leaks in the Kubelet.
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func (c *portForwardCommand) Stop() {
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// SIGINT signals that kubectl port-forward should gracefully terminate
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if err := c.cmd.Process.Signal(syscall.SIGINT); err != nil {
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framework.Logf("error sending SIGINT to kubectl port-forward: %v", err)
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}
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// try to wait for a clean exit
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done := make(chan error)
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go func() {
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done <- c.cmd.Wait()
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}()
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expired := time.NewTimer(wait.ForeverTestTimeout)
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defer expired.Stop()
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select {
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case err := <-done:
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if err == nil {
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// success
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return
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}
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framework.Logf("error waiting for kubectl port-forward to exit: %v", err)
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case <-expired.C:
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framework.Logf("timed out waiting for kubectl port-forward to exit")
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}
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framework.Logf("trying to forcibly kill kubectl port-forward")
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framework.TryKill(c.cmd)
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}
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func runPortForward(ns, podName string, port int) *portForwardCommand {
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cmd := framework.KubectlCmd("port-forward", fmt.Sprintf("--namespace=%v", ns), podName, fmt.Sprintf(":%d", port))
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// This is somewhat ugly but is the only way to retrieve the port that was picked
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// by the port-forward command. We don't want to hard code the port as we have no
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// way of guaranteeing we can pick one that isn't in use, particularly on Jenkins.
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framework.Logf("starting port-forward command and streaming output")
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stdout, stderr, err := framework.StartCmdAndStreamOutput(cmd)
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if err != nil {
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framework.Failf("Failed to start port-forward command: %v", err)
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}
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buf := make([]byte, 128)
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// After v1.3.0-alpha.4 (#17030), kubectl port-forward outputs port
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// info to stdout, not stderr, so for version-skewed tests, look there
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// instead.
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var portOutput io.ReadCloser
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if useStdOut, err := framework.KubectlVersionGTE(portForwardPortToStdOutV); err != nil {
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framework.Failf("Failed to get kubectl version: %v", err)
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} else if useStdOut {
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portOutput = stdout
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} else {
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portOutput = stderr
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}
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var n int
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framework.Logf("reading from `kubectl port-forward` command's stdout")
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if n, err = portOutput.Read(buf); err != nil {
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framework.Failf("Failed to read from kubectl port-forward stdout: %v", err)
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}
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portForwardOutput := string(buf[:n])
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match := portForwardRegexp.FindStringSubmatch(portForwardOutput)
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if len(match) != 2 {
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framework.Failf("Failed to parse kubectl port-forward output: %s", portForwardOutput)
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}
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listenPort, err := strconv.Atoi(match[1])
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if err != nil {
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framework.Failf("Error converting %s to an int: %v", match[1], err)
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}
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return &portForwardCommand{
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cmd: cmd,
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port: listenPort,
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}
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}
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func doTestConnectSendDisconnect(bindAddress string, f *framework.Framework) {
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By("creating the target pod")
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pod := pfPod("", "10", "10", "100", fmt.Sprintf("%s", bindAddress))
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if _, err := f.ClientSet.Core().Pods(f.Namespace.Name).Create(pod); err != nil {
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framework.Failf("Couldn't create pod: %v", err)
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}
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if err := f.WaitForPodReady(pod.Name); err != nil {
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framework.Failf("Pod did not start running: %v", err)
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}
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defer func() {
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logs, err := framework.GetPodLogs(f.ClientSet, f.Namespace.Name, pod.Name, "portforwardtester")
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if err != nil {
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framework.Logf("Error getting pod log: %v", err)
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} else {
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framework.Logf("Pod log:\n%s", logs)
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}
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}()
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By("Running 'kubectl port-forward'")
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cmd := runPortForward(f.Namespace.Name, pod.Name, 80)
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defer cmd.Stop()
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By("Dialing the local port")
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conn, err := net.Dial("tcp", fmt.Sprintf("127.0.0.1:%d", cmd.port))
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if err != nil {
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framework.Failf("Couldn't connect to port %d: %v", cmd.port, err)
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}
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defer func() {
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By("Closing the connection to the local port")
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conn.Close()
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}()
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By("Reading data from the local port")
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fromServer, err := ioutil.ReadAll(conn)
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if err != nil {
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framework.Failf("Unexpected error reading data from the server: %v", err)
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}
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if e, a := strings.Repeat("x", 100), string(fromServer); e != a {
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framework.Failf("Expected %q from server, got %q", e, a)
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}
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By("Waiting for the target pod to stop running")
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if err := WaitForTerminatedContainer(f, pod, "portforwardtester"); err != nil {
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framework.Failf("Container did not terminate: %v", err)
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}
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By("Verifying logs")
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logOutput, err := framework.GetPodLogs(f.ClientSet, f.Namespace.Name, pod.Name, "portforwardtester")
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if err != nil {
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framework.Failf("Error retrieving pod logs: %v", err)
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}
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verifyLogMessage(logOutput, "Accepted client connection")
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verifyLogMessage(logOutput, "Done")
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}
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func doTestMustConnectSendNothing(bindAddress string, f *framework.Framework) {
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By("creating the target pod")
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pod := pfPod("abc", "1", "1", "1", fmt.Sprintf("%s", bindAddress))
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if _, err := f.ClientSet.Core().Pods(f.Namespace.Name).Create(pod); err != nil {
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framework.Failf("Couldn't create pod: %v", err)
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}
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if err := f.WaitForPodReady(pod.Name); err != nil {
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framework.Failf("Pod did not start running: %v", err)
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}
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defer func() {
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logs, err := framework.GetPodLogs(f.ClientSet, f.Namespace.Name, pod.Name, "portforwardtester")
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if err != nil {
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framework.Logf("Error getting pod log: %v", err)
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} else {
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framework.Logf("Pod log:\n%s", logs)
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}
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}()
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By("Running 'kubectl port-forward'")
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cmd := runPortForward(f.Namespace.Name, pod.Name, 80)
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defer cmd.Stop()
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By("Dialing the local port")
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conn, err := net.Dial("tcp", fmt.Sprintf("127.0.0.1:%d", cmd.port))
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if err != nil {
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framework.Failf("Couldn't connect to port %d: %v", cmd.port, err)
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}
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By("Closing the connection to the local port")
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conn.Close()
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By("Waiting for the target pod to stop running")
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if err := WaitForTerminatedContainer(f, pod, "portforwardtester"); err != nil {
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framework.Failf("Container did not terminate: %v", err)
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}
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By("Verifying logs")
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logOutput, err := framework.GetPodLogs(f.ClientSet, f.Namespace.Name, pod.Name, "portforwardtester")
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if err != nil {
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framework.Failf("Error retrieving pod logs: %v", err)
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}
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verifyLogMessage(logOutput, "Accepted client connection")
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verifyLogMessage(logOutput, "Expected to read 3 bytes from client, but got 0 instead")
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}
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func doTestMustConnectSendDisconnect(bindAddress string, f *framework.Framework) {
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By("creating the target pod")
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pod := pfPod("abc", "10", "10", "100", fmt.Sprintf("%s", bindAddress))
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if _, err := f.ClientSet.Core().Pods(f.Namespace.Name).Create(pod); err != nil {
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framework.Failf("Couldn't create pod: %v", err)
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}
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if err := f.WaitForPodReady(pod.Name); err != nil {
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framework.Failf("Pod did not start running: %v", err)
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}
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defer func() {
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logs, err := framework.GetPodLogs(f.ClientSet, f.Namespace.Name, pod.Name, "portforwardtester")
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if err != nil {
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framework.Logf("Error getting pod log: %v", err)
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} else {
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framework.Logf("Pod log:\n%s", logs)
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}
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}()
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By("Running 'kubectl port-forward'")
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cmd := runPortForward(f.Namespace.Name, pod.Name, 80)
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defer cmd.Stop()
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By("Dialing the local port")
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addr, err := net.ResolveTCPAddr("tcp", fmt.Sprintf("127.0.0.1:%d", cmd.port))
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if err != nil {
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framework.Failf("Error resolving tcp addr: %v", err)
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}
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conn, err := net.DialTCP("tcp", nil, addr)
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if err != nil {
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framework.Failf("Couldn't connect to port %d: %v", cmd.port, err)
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}
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defer func() {
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By("Closing the connection to the local port")
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conn.Close()
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}()
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By("Sending the expected data to the local port")
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fmt.Fprint(conn, "abc")
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By("Closing the write half of the client's connection")
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conn.CloseWrite()
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By("Reading data from the local port")
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fromServer, err := ioutil.ReadAll(conn)
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if err != nil {
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framework.Failf("Unexpected error reading data from the server: %v", err)
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}
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if e, a := strings.Repeat("x", 100), string(fromServer); e != a {
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framework.Failf("Expected %q from server, got %q", e, a)
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}
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By("Waiting for the target pod to stop running")
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if err := WaitForTerminatedContainer(f, pod, "portforwardtester"); err != nil {
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framework.Failf("Container did not terminate: %v", err)
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}
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By("Verifying logs")
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logOutput, err := framework.GetPodLogs(f.ClientSet, f.Namespace.Name, pod.Name, "portforwardtester")
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if err != nil {
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framework.Failf("Error retrieving pod logs: %v", err)
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}
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verifyLogMessage(logOutput, "^Accepted client connection$")
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verifyLogMessage(logOutput, "^Received expected client data$")
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verifyLogMessage(logOutput, "^Done$")
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}
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var _ = framework.KubeDescribe("Port forwarding", func() {
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f := framework.NewDefaultFramework("port-forwarding")
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framework.KubeDescribe("With a server listening on 0.0.0.0 that expects a client request", func() {
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It("should support a client that connects, sends no data, and disconnects", func() {
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doTestMustConnectSendNothing("0.0.0.0", f)
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})
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It("should support a client that connects, sends data, and disconnects", func() {
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doTestMustConnectSendDisconnect("0.0.0.0", f)
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})
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})
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framework.KubeDescribe("With a server listening on 0.0.0.0 that expects no client request", func() {
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It("should support a client that connects, sends data, and disconnects", func() {
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doTestConnectSendDisconnect("0.0.0.0", f)
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})
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})
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framework.KubeDescribe("With a server listening on localhost that expects a client request", func() {
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It("should support a client that connects, sends no data, and disconnects [Conformance]", func() {
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doTestMustConnectSendNothing("localhost", f)
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})
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It("should support a client that connects, sends data, and disconnects [Conformance]", func() {
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doTestMustConnectSendDisconnect("localhost", f)
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})
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})
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framework.KubeDescribe("With a server listening on localhost that expects no client request", func() {
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It("should support a client that connects, sends data, and disconnects [Conformance]", func() {
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doTestConnectSendDisconnect("localhost", f)
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})
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})
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})
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func verifyLogMessage(log, expected string) {
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re := regexp.MustCompile(expected)
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lines := strings.Split(log, "\n")
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for i := range lines {
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if re.MatchString(lines[i]) {
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return
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}
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}
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framework.Failf("Missing %q from log: %s", expected, log)
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}
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