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integration.go
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integration.go
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package integration
import (
"bufio"
"bytes"
"context"
"encoding/json"
"fmt"
"io"
"os"
"os/exec"
"os/user"
"strings"
"syscall"
"time"
"github.com/k3s-io/k3s/pkg/flock"
"github.com/pkg/errors"
"github.com/sirupsen/logrus"
"github.com/vishvananda/netlink"
"golang.org/x/sys/unix"
corev1 "k8s.io/api/core/v1"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/client-go/kubernetes"
"k8s.io/client-go/tools/clientcmd"
)
// Compile-time variable
var existingServer = "False"
const lockFile = "/tmp/k3s-test.lock"
type K3sServer struct {
cmd *exec.Cmd
log *os.File
}
func findK3sExecutable() string {
// if running on an existing cluster, it maybe installed via k3s.service
// or run manually from dist/artifacts/k3s
if IsExistingServer() {
k3sBin, err := exec.LookPath("k3s")
if err == nil {
return k3sBin
}
}
k3sBin := "dist/artifacts/k3s"
i := 0
for ; i < 20; i++ {
_, err := os.Stat(k3sBin)
if err != nil {
k3sBin = "../" + k3sBin
continue
}
break
}
if i == 20 {
logrus.Fatal("Unable to find k3s executable")
}
return k3sBin
}
// IsRoot return true if the user is root (UID 0)
func IsRoot() bool {
currentUser, err := user.Current()
if err != nil {
return false
}
return currentUser.Uid == "0"
}
func IsExistingServer() bool {
return existingServer == "True"
}
// K3sCmd launches the provided K3s command via exec. Command blocks until finished.
// Command output from both Stderr and Stdout is provided via string. Input can
// be a single string with space separated args, or multiple string args
// cmdEx1, err := K3sCmd("etcd-snapshot", "ls")
// cmdEx2, err := K3sCmd("kubectl get pods -A")
// cmdEx2, err := K3sCmd("kubectl", "get", "pods", "-A")
func K3sCmd(inputArgs ...string) (string, error) {
if !IsRoot() {
return "", errors.New("integration tests must be run as sudo/root")
}
k3sBin := findK3sExecutable()
var k3sCmd []string
for _, arg := range inputArgs {
k3sCmd = append(k3sCmd, strings.Fields(arg)...)
}
cmd := exec.Command(k3sBin, k3sCmd...)
byteOut, err := cmd.CombinedOutput()
return string(byteOut), err
}
func contains(source []string, target string) bool {
for _, s := range source {
if s == target {
return true
}
}
return false
}
// ServerArgsPresent checks if the given arguments are found in the running k3s server
func ServerArgsPresent(neededArgs []string) bool {
currentArgs := K3sServerArgs()
for _, arg := range neededArgs {
if !contains(currentArgs, arg) {
return false
}
}
return true
}
// K3sServerArgs returns the list of arguments that the k3s server launched with
func K3sServerArgs() []string {
results, err := K3sCmd("kubectl", "get", "nodes", "-o", `jsonpath='{.items[0].metadata.annotations.k3s\.io/node-args}'`)
if err != nil {
return nil
}
res := strings.ReplaceAll(results, "'", "")
var args []string
if err := json.Unmarshal([]byte(res), &args); err != nil {
logrus.Error(err)
return nil
}
return args
}
// K3sDefaultDeployments checks if the default deployments for K3s are ready, otherwise returns an error
func K3sDefaultDeployments() error {
return CheckDeployments([]string{"coredns", "local-path-provisioner", "metrics-server", "traefik"})
}
// CheckDeployments checks if the provided list of deployments are ready, otherwise returns an error
func CheckDeployments(deployments []string) error {
deploymentSet := make(map[string]bool)
for _, d := range deployments {
deploymentSet[d] = false
}
client, err := k8sClient()
if err != nil {
return err
}
deploymentList, err := client.AppsV1().Deployments("").List(context.Background(), metav1.ListOptions{})
if err != nil {
return err
}
for _, deployment := range deploymentList.Items {
if _, ok := deploymentSet[deployment.Name]; ok && deployment.Status.ReadyReplicas == deployment.Status.Replicas {
deploymentSet[deployment.Name] = true
}
}
for d, found := range deploymentSet {
if !found {
return fmt.Errorf("failed to deploy %s", d)
}
}
return nil
}
func ParsePods(namespace string, opts metav1.ListOptions) ([]corev1.Pod, error) {
clientSet, err := k8sClient()
if err != nil {
return nil, err
}
pods, err := clientSet.CoreV1().Pods(namespace).List(context.Background(), opts)
if err != nil {
return nil, err
}
return pods.Items, nil
}
func ParseNodes() ([]corev1.Node, error) {
clientSet, err := k8sClient()
if err != nil {
return nil, err
}
nodes, err := clientSet.CoreV1().Nodes().List(context.Background(), metav1.ListOptions{})
if err != nil {
return nil, err
}
return nodes.Items, nil
}
func GetPod(namespace, name string) (*corev1.Pod, error) {
client, err := k8sClient()
if err != nil {
return nil, err
}
return client.CoreV1().Pods(namespace).Get(context.Background(), name, metav1.GetOptions{})
}
func GetPersistentVolumeClaim(namespace, name string) (*corev1.PersistentVolumeClaim, error) {
client, err := k8sClient()
if err != nil {
return nil, err
}
return client.CoreV1().PersistentVolumeClaims(namespace).Get(context.Background(), name, metav1.GetOptions{})
}
func GetPersistentVolume(name string) (*corev1.PersistentVolume, error) {
client, err := k8sClient()
if err != nil {
return nil, err
}
return client.CoreV1().PersistentVolumes().Get(context.Background(), name, metav1.GetOptions{})
}
func SearchK3sLog(k3s *K3sServer, target string) (bool, error) {
file, err := os.Open(k3s.log.Name())
if err != nil {
return false, err
}
scanner := bufio.NewScanner(file)
for scanner.Scan() {
if strings.Contains(scanner.Text(), target) {
return true, nil
}
}
if scanner.Err() != nil {
return false, scanner.Err()
}
return false, nil
}
func K3sTestLock() (int, error) {
logrus.Info("waiting to get test lock")
return flock.Acquire(lockFile)
}
// K3sStartServer acquires an exclusive lock on a temporary file, then launches a k3s cluster
// with the provided arguments. Subsequent/parallel calls to this function will block until
// the original lock is cleared using K3sKillServer
func K3sStartServer(inputArgs ...string) (*K3sServer, error) {
if !IsRoot() {
return nil, errors.New("integration tests must be run as sudo/root")
}
k3sBin := findK3sExecutable()
k3sCmd := append([]string{"server"}, inputArgs...)
cmd := exec.Command(k3sBin, k3sCmd...)
// Give the server a new group id so we can kill it and its children later
cmd.SysProcAttr = &syscall.SysProcAttr{Setpgid: true}
// Pipe output to a file for debugging later
f, err := os.Create("./k3log.txt")
if err != nil {
return nil, err
}
cmd.Stderr = f
err = cmd.Start()
return &K3sServer{cmd, f}, err
}
// K3sStopServer gracefully stops the running K3s server and does not kill its children.
// Equivalent to stopping the K3s service
func K3sStopServer(server *K3sServer) error {
if server.log != nil {
server.log.Close()
}
if err := server.cmd.Process.Signal(syscall.SIGTERM); err != nil {
return err
}
time.Sleep(10 * time.Second)
if err := server.cmd.Process.Kill(); err != nil {
return err
}
if _, err := server.cmd.Process.Wait(); err != nil {
return err
}
return nil
}
// K3sKillServer terminates the running K3s server and its children.
// Equivalent to k3s-killall.sh
func K3sKillServer(server *K3sServer) error {
if server == nil {
return nil
}
if server.log != nil {
server.log.Close()
os.Remove(server.log.Name())
}
pgid, err := syscall.Getpgid(server.cmd.Process.Pid)
if err != nil {
if errors.Is(err, syscall.ESRCH) {
logrus.Warnf("Unable to kill k3s server: %v", err)
return nil
}
return errors.Wrap(err, "failed to find k3s process group")
}
if err := syscall.Kill(-pgid, syscall.SIGKILL); err != nil {
return errors.Wrap(err, "failed to kill k3s process group")
}
if err := server.cmd.Process.Kill(); err != nil {
return errors.Wrap(err, "failed to kill k3s process")
}
if _, err = server.cmd.Process.Wait(); err != nil {
return errors.Wrap(err, "failed to wait for k3s process exit")
}
//Unmount all the associated filesystems
unmountFolder("/run/k3s")
unmountFolder("/run/netns/cni-")
return nil
}
// K3sCleanup unlocks the test-lock and
// attempts to cleanup networking and files leftover from an integration test.
// This is similar to the k3s-killall.sh script, but we dynamically generate that on
// install, so we don't have access to it during testing.
func K3sCleanup(k3sTestLock int, dataDir string) error {
if cni0Link, err := netlink.LinkByName("cni0"); err == nil {
links, _ := netlink.LinkList()
for _, link := range links {
if link.Attrs().MasterIndex == cni0Link.Attrs().Index {
netlink.LinkDel(link)
}
}
netlink.LinkDel(cni0Link)
}
if flannel1, err := netlink.LinkByName("flannel.1"); err == nil {
netlink.LinkDel(flannel1)
}
if flannelV6, err := netlink.LinkByName("flannel-v6.1"); err == nil {
netlink.LinkDel(flannelV6)
}
if dataDir == "" {
dataDir = "/var/lib/rancher/k3s"
}
if err := os.RemoveAll(dataDir); err != nil {
return err
}
if k3sTestLock != -1 {
return flock.Release(k3sTestLock)
}
return nil
}
func K3sSaveLog(server *K3sServer, dump bool) error {
server.log.Close()
if !dump {
return nil
}
log, err := os.Open(server.log.Name())
if err != nil {
return err
}
defer log.Close()
b, err := io.ReadAll(log)
if err != nil {
return err
}
fmt.Printf("Server Log Dump:\n\n%s\n\n", b)
return nil
}
func GetEndpointsAddresses() (string, error) {
client, err := k8sClient()
if err != nil {
return "", err
}
endpoints, err := client.CoreV1().Endpoints("default").Get(context.Background(), "kubernetes", metav1.GetOptions{})
if err != nil {
return "", err
}
var addresses []string
for _, subset := range endpoints.Subsets {
for _, address := range subset.Addresses {
addresses = append(addresses, address.IP)
}
}
return strings.Join(addresses, ","), nil
}
// RunCommand Runs command on the host
func RunCommand(cmd string) (string, error) {
c := exec.Command("bash", "-c", cmd)
var out bytes.Buffer
c.Stdout = &out
err := c.Run()
if err != nil {
return "", fmt.Errorf("%s", err)
}
return out.String(), nil
}
func unmountFolder(folder string) error {
mounts := []string{}
f, err := os.ReadFile("/proc/self/mounts")
if err != nil {
return err
}
for _, line := range strings.Split(string(f), "\n") {
columns := strings.Split(line, " ")
if len(columns) > 1 {
mounts = append(mounts, columns[1])
}
}
for _, mount := range mounts {
if strings.Contains(mount, folder) {
if err := unix.Unmount(mount, 0); err != nil {
return err
}
if err = os.Remove(mount); err != nil {
return err
}
}
}
return nil
}
func k8sClient() (*kubernetes.Clientset, error) {
config, err := clientcmd.BuildConfigFromFlags("", "/etc/rancher/k3s/k3s.yaml")
if err != nil {
return nil, err
}
clientSet, err := kubernetes.NewForConfig(config)
if err != nil {
return nil, err
}
return clientSet, nil
}