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integration_test.go
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package kuberun_test
import (
"bufio"
"bytes"
"context"
"fmt"
"io"
"net"
"os"
"testing"
"time"
"github.com/containerssh/log"
"github.com/containerssh/sshserver"
"github.com/containerssh/structutils"
"github.com/stretchr/testify/assert"
v1Api "k8s.io/api/core/v1"
v1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/client-go/kubernetes"
"github.com/containerssh/kuberun"
)
func TestSuccessfulHandshakeShouldCreatePod(t *testing.T) {
t.Parallel()
config := kuberun.Config{}
structutils.Defaults(&config)
config.Pod.Spec.Containers[0].Image = "docker.io/library/busybox"
if err := kuberun.SetConfigFromKubeConfig(&config); err != nil {
assert.FailNow(t, "failed to create configuration from the current users kubeconfig (%v)", err)
}
connectionID := sshserver.GenerateConnectionID()
logger := getLogger(t)
kr := createKuberun(t, connectionID, config, logger)
defer kr.OnDisconnect()
_, err := kr.OnHandshakeSuccess("test")
assert.Nil(t, err, "failed to create handshake handler (%v)", err)
k8sConfig := kuberun.CreateConnectionConfig(config)
cli, err := kubernetes.NewForConfig(&k8sConfig)
assert.Nil(t, err, "failed to create k8s client (%v)", err)
podList, err := cli.CoreV1().Pods(config.Pod.Namespace).List(context.Background(), v1.ListOptions{
LabelSelector: fmt.Sprintf("%s=%s", "containerssh_connection_id", connectionID),
})
assert.Nil(t, err, "failed to list k8s pods (%v)", err)
assert.Equal(t, 1, len(podList.Items))
assert.Equal(t, v1Api.PodRunning, podList.Items[0].Status.Phase)
assert.Equal(t, true, *podList.Items[0].Status.ContainerStatuses[0].Started)
}
func TestSingleSessionShouldRunProgram(t *testing.T) {
t.Parallel()
_, session, kr := setupKuberun(t)
defer kr.OnDisconnect()
stdin := bytes.NewReader([]byte{})
var stdoutBytes bytes.Buffer
stdout := bufio.NewWriter(&stdoutBytes)
var stderrBytes bytes.Buffer
stderr := bufio.NewWriter(&stderrBytes)
done := make(chan struct{})
status := 0
err := session.OnExecRequest(
0,
"echo \"Hello world!\"",
stdin,
stdout,
stderr,
func(exitStatus sshserver.ExitStatus) {
status = int(exitStatus)
done <- struct{}{}
},
)
assert.Nil(t, err)
<-done
assert.Nil(t, stdout.Flush())
assert.Equal(t, "Hello world!\n", stdoutBytes.String())
assert.Equal(t, "", stderrBytes.String())
assert.Equal(t, 0, status)
}
func TestCommandExecutionShouldReturnStatusCode(t *testing.T) {
t.Parallel()
_, session, kr := setupKuberun(t)
defer kr.OnDisconnect()
stdin := bytes.NewReader([]byte{})
var stdoutBytes bytes.Buffer
stdout := bufio.NewWriter(&stdoutBytes)
var stderrBytes bytes.Buffer
stderr := bufio.NewWriter(&stderrBytes)
done := make(chan struct{})
status := 0
err := session.OnExecRequest(
0,
"exit 42",
stdin,
stdout,
stderr,
func(exitStatus sshserver.ExitStatus) {
status = int(exitStatus)
done <- struct{}{}
},
)
assert.Nil(t, err)
<-done
assert.Nil(t, stdout.Flush())
assert.Equal(t, 42, status)
}
func TestSingleSessionShouldRunShell(t *testing.T) {
t.Parallel()
logger, session, kr := setupKuberun(t)
defer kr.OnDisconnect()
var err error
stdin, stdinWriter := io.Pipe()
stdoutReader, stdout := io.Pipe()
_, stderr := io.Pipe()
done := make(chan struct{})
status := 0
must(t, assert.NoError(t, session.OnEnvRequest(0, "foo", "bar")))
must(t, assert.NoError(t, session.OnPtyRequest(1, "xterm", 80, 25, 800, 600, []byte{})))
go func() {
must(t, assert.NoError(t, readUntil(stdoutReader, []byte("# "))))
must(t, assert.NoError(t, session.OnWindow(2, 120, 25, 800, 600)))
// HACK: Kubernetes doesn't handle window resizes synchronously. See HACKS.md
time.Sleep(200 * time.Millisecond)
logger.Warningf("The following test step may hang indefinitely. See HACKS.md \"Kubernetes doesn't handle window resizes synchronously\" for details...")
_, err = stdinWriter.Write([]byte("tput cols\n"))
must(t, assert.NoError(t, readUntil(stdoutReader, []byte("tput cols\r\n120\r\n# "))))
logger.Warningf("Test step complete.")
_, err = stdinWriter.Write([]byte("echo \"Hello world!\"\n"))
must(t, assert.NoError(t, err))
must(t, assert.NoError(t, readUntil(stdoutReader, []byte("echo \"Hello world!\"\r\nHello world!\r\n# "))))
_, err = stdinWriter.Write([]byte("exit\n"))
must(t, assert.NoError(t, err))
must(t, assert.NoError(t, readUntil(stdoutReader, []byte("exit\r\n"))))
}()
err = session.OnShell(
3,
stdin,
stdout,
stderr,
func(exitStatus sshserver.ExitStatus) {
status = int(exitStatus)
done <- struct{}{}
},
)
must(t, assert.Nil(t, err))
<-done
assert.Equal(t, 0, status)
}
func setupKuberun(t *testing.T) (log.Logger, sshserver.SessionChannelHandler, sshserver.NetworkConnectionHandler) {
config := kuberun.Config{}
structutils.Defaults(&config)
config.Pod.ShellCommand = []string{"/bin/sh"}
err := kuberun.SetConfigFromKubeConfig(&config)
assert.Nil(t, err, "failed to set up kube config (%v)", err)
connectionID := sshserver.GenerateConnectionID()
logger := getLogger(t)
kr := createKuberun(t, connectionID, config, logger)
ssh, err := kr.OnHandshakeSuccess("test")
assert.Nil(t, err, "failed to create handshake handler (%v)", err)
session, err := ssh.OnSessionChannel(0, []byte{})
assert.Nil(t, err, "failed to to create session channel (%v)", err)
return logger, session, kr
}
func must(t *testing.T, arg bool) {
if !arg {
t.FailNow()
}
}
func readUntil(reader io.Reader, buffer []byte) error {
byteBuffer := bytes.NewBuffer([]byte{})
for {
buf := make([]byte, 1024)
n, err := reader.Read(buf)
if err != nil {
return err
}
byteBuffer.Write(buf[:n])
if bytes.Equal(byteBuffer.Bytes(), buffer) {
return nil
}
}
}
func createKuberun(
t *testing.T,
connectionID string,
config kuberun.Config,
logger log.Logger,
) sshserver.NetworkConnectionHandler {
kr, err := kuberun.New(
net.TCPAddr{
IP: net.ParseIP("127.0.0.1"),
Port: 2222,
Zone: "",
},
connectionID,
config,
logger,
)
assert.NoError(t, err, "failed to create handler (%v)", err)
return kr
}
func getLogger(t *testing.T) log.Logger {
logger, err := log.New(
log.Config{
Level: log.LevelDebug,
Format: log.FormatText,
},
"kuberun",
os.Stdout,
)
assert.NoError(t, err)
return logger
}