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executor.go
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executor.go
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package k8s
import (
"encoding/json"
"fmt"
"math/rand"
"slices"
"strconv"
"strings"
"time"
"github.com/pkg/errors"
"github.com/deviceinsight/kafkactl/v5/internal"
"github.com/deviceinsight/kafkactl/v5/internal/output"
"golang.org/x/term"
)
type Version struct {
Major int
Minor int
GitVersion string
}
type executor struct {
kubectlBinary string
image string
imagePullSecret string
version Version
runner Runner
clientID string
kubeConfig string
kubeContext string
serviceAccount string
keepPod bool
namespace string
labels map[string]string
annotations map[string]string
nodeSelector map[string]string
}
const letterBytes = "abcdefghijklmnpqrstuvwxyz123456789"
func randomString(n int) string {
r := rand.New(rand.NewSource(time.Now().UnixNano()))
b := make([]byte, n)
for i := range b {
b[i] = letterBytes[r.Intn(len(letterBytes))]
}
return string(b)
}
func getKubectlVersion(kubectlBinary string, runner Runner) Version {
bytes, err := runner.ExecuteAndReturn(kubectlBinary, []string{"version", "--client", "-o", "json"})
if err != nil {
output.Fail(err)
return Version{}
}
if len(bytes) == 0 {
return Version{}
}
type versionOutput struct {
ClientVersion struct {
Major string `json:"major"`
Minor string `json:"minor"`
GitVersion string `json:"gitVersion"`
} `json:"clientVersion"`
}
var jsonOutput versionOutput
if err := json.Unmarshal(bytes, &jsonOutput); err != nil {
output.Fail(fmt.Errorf("unable to extract kubectl version: %w", err))
return Version{}
}
major, err := strconv.Atoi(jsonOutput.ClientVersion.Major)
if err != nil {
output.Fail(err)
}
minor, err := strconv.Atoi(jsonOutput.ClientVersion.Minor)
if err != nil {
output.Fail(err)
}
return Version{
Major: major,
Minor: minor,
GitVersion: jsonOutput.ClientVersion.GitVersion,
}
}
func newExecutor(context internal.ClientContext, runner Runner) *executor {
return &executor{
kubectlBinary: context.Kubernetes.Binary,
version: getKubectlVersion(context.Kubernetes.Binary, runner),
image: context.Kubernetes.Image,
imagePullSecret: context.Kubernetes.ImagePullSecret,
clientID: internal.GetClientID(&context, ""),
kubeConfig: context.Kubernetes.KubeConfig,
kubeContext: context.Kubernetes.KubeContext,
namespace: context.Kubernetes.Namespace,
serviceAccount: context.Kubernetes.ServiceAccount,
keepPod: context.Kubernetes.KeepPod,
labels: context.Kubernetes.Labels,
annotations: context.Kubernetes.Annotations,
nodeSelector: context.Kubernetes.NodeSelector,
runner: runner,
}
}
func (kubectl *executor) SetKubectlBinary(bin string) {
kubectl.kubectlBinary = bin
}
func (kubectl *executor) Run(dockerImageType, entryPoint string, kafkactlArgs []string, podEnvironment []string) error {
dockerImage := getDockerImage(kubectl.image, dockerImageType)
podName := fmt.Sprintf("kafkactl-%s-%s", strings.ToLower(kubectl.clientID), randomString(4))
kubectlArgs := []string{
"run", "-i", "--tty", "--restart=Never", podName,
"--image", dockerImage,
}
if !kubectl.keepPod {
kubectlArgs = slices.Insert(kubectlArgs, 1, "--rm")
}
if kubectl.kubeConfig != "" {
kubectlArgs = append(kubectlArgs, "--kubeconfig", kubectl.kubeConfig)
}
podOverride := kubectl.createPodOverride()
if !podOverride.IsEmpty() {
podOverrideJSON, err := json.Marshal(podOverride)
if err != nil {
return errors.Wrap(err, "unable to create override")
}
kubectlArgs = append(kubectlArgs, "--overrides", string(podOverrideJSON))
}
kubectlArgs = append(kubectlArgs, "--context", kubectl.kubeContext)
kubectlArgs = append(kubectlArgs, "--namespace", kubectl.namespace)
for _, env := range podEnvironment {
kubectlArgs = append(kubectlArgs, "--env", env)
}
kubectlArgs = addTerminalSizeEnv(kubectlArgs)
kubectlArgs = append(kubectlArgs, "--command", "--", entryPoint)
// Keep only kafkactl arguments that are relevant in k8s context
allExceptConfigFileFilter := func(s string) bool {
return !strings.HasPrefix(s, "-C=") && !strings.HasPrefix(s, "--config-file=")
}
kubectlArgs = append(kubectlArgs, filter(kafkactlArgs, allExceptConfigFileFilter)...)
return kubectl.exec(kubectlArgs)
}
func addTerminalSizeEnv(args []string) []string {
if !term.IsTerminal(0) {
output.Debugf("no terminal detected")
return args
}
width, height, err := term.GetSize(0)
if err != nil {
output.Debugf("unable to determine terminal size: %v", err)
return args
}
args = append(args, "--env", fmt.Sprintf("TERM_WIDTH=%d", width))
args = append(args, "--env", fmt.Sprintf("TERM_HEIGHT=%d", height))
return args
}
func getDockerImage(image string, imageType string) string {
if KafkaCtlVersion == "" {
KafkaCtlVersion = "latest"
}
if image == "" {
image = "deviceinsight/kafkactl"
}
if strings.Contains(image, ":") {
return image + "-" + imageType
}
return image + ":" + KafkaCtlVersion + "-" + imageType
}
func filter(slice []string, predicate func(string) bool) (ret []string) {
for _, s := range slice {
if predicate(s) {
ret = append(ret, s)
}
}
return
}
func (kubectl *executor) exec(args []string) error {
cmd := fmt.Sprintf("exec: %s %s", kubectl.kubectlBinary, join(args))
output.Debugf("kubectl version: %s", kubectl.version.GitVersion)
output.Debugf(cmd)
err := kubectl.runner.Execute(kubectl.kubectlBinary, args)
return err
}
func join(args []string) string {
allArgs := ""
for _, arg := range args {
if strings.Contains(arg, " ") {
arg = "\"" + arg + "\""
}
allArgs += " " + arg
}
return strings.TrimLeft(allArgs, " ")
}
func (kubectl *executor) GetVersion() Version {
return kubectl.version
}
func (kubectl *executor) IsVersionAtLeast(major int, minor int) bool {
return kubectl.version.Major >= major && kubectl.version.Minor >= minor
}