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kubectl.go
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kubectl.go
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package k8s
import (
"encoding/json"
"os"
"os/exec"
"strings"
"time"
"github.com/spf13/viper"
"go.uber.org/zap"
)
func runKubectl(cmd *exec.Cmd) ([]byte, error) {
if viper.GetBool("TUBER_DEBUG") {
logger, zapErr := zap.NewDevelopment()
if zapErr != nil {
return nil, zapErr
}
logger.Debug(strings.Join(cmd.Args, " "))
}
out, err := cmd.CombinedOutput()
if err != nil || cmd.ProcessState.ExitCode() != 0 {
err = newK8sError(out, err)
return nil, err
}
if viper.GetBool("TUBER_DEBUG") {
logger, zapErr := zap.NewDevelopment()
if zapErr != nil {
return nil, zapErr
}
logger.Debug(string(out))
}
return out, nil
}
func kubectl(args ...string) ([]byte, error) {
return runKubectl(exec.Command("kubectl", args...))
}
func kubectlIO(args ...string) error {
cmd := exec.Command("kubectl", args...)
cmd.Stdout = os.Stdout
cmd.Stdin = os.Stdin
cmd.Stderr = os.Stderr
if viper.GetBool("TUBER_DEBUG") {
logger, zapErr := zap.NewDevelopment()
if zapErr != nil {
return zapErr
}
logger.Debug(strings.Join(cmd.Args, " "))
}
return cmd.Run()
}
func pipeToKubectl(data []byte, args ...string) (out []byte, err error) {
cmd := exec.Command("kubectl", args...)
stdin, err := cmd.StdinPipe()
if err != nil {
return
}
_, err = stdin.Write(data)
if err != nil {
return
}
err = stdin.Close()
if err != nil {
return
}
return runKubectl(cmd)
}
// Apply `kubectl apply` data to a given namespace. Specify output or any other flags as args.
// Uses a stdin pipe to include the content of the data slice
func Apply(data []byte, namespace string, args ...string) (err error) {
apply := []string{"apply", "-n", namespace, "-f", "-"}
_, err = pipeToKubectl(data, append(apply, args...)...)
return
}
// Get `kubectl get` a resource. Specify output or any other flags as args
func Get(kind string, name string, namespace string, args ...string) ([]byte, error) {
get := []string{"get", kind, name, "-n", namespace}
return kubectl(append(get, args...)...)
}
// GetCollection gets for plural resource types break if given even an empty name
func GetCollection(kind string, namespace string, args ...string) ([]byte, error) {
get := []string{"get", kind, "-n", namespace}
return kubectl(append(get, args...)...)
}
// Delete `kubectl delete` a resource. Specify output or any other flags as args
func Delete(kind string, name string, namespace string, args ...string) (err error) {
deleteArgs := []string{"delete", kind, name, "-n", namespace}
_, err = kubectl(append(deleteArgs, args...)...)
return
}
// Create `kubectl create` a resource.
// Some resources take multiple args (like secrets), so both the resource type and any flags are the variadic
func Create(namespace string, resourceAndArgs ...string) (err error) {
create := []string{"create", "-n", namespace}
_, err = kubectl(append(create, resourceAndArgs...)...)
return
}
// Restart runs a rollout restart on a given resource type for a namespace
// For example, `Restart("deployments", "some-app")` will restart _all_ deployments in that namespace
func Restart(resource string, namespace string, args ...string) (err error) {
restart := []string{"rollout", "restart", resource, "-n", namespace}
_, err = kubectl(append(restart, args...)...)
return
}
// RolloutStatus waits and watches a rollout's progress
func RolloutStatus(kind string, name string, namespace string, timeout time.Duration, args ...string) error {
status := []string{"rollout", "status", kind, name, "-n", namespace, "--timeout", timeout.String()}
_, err := kubectl(append(status, args...)...)
return err
}
// RolloutUndo runs undo on a rollout
func RolloutUndo(kind string, name string, namespace string, args ...string) error {
status := []string{"rollout", "undo", kind, name, "-n", namespace}
_, err := kubectl(append(status, args...)...)
return err
}
// Exists tells you if a given resource already exists. Errors if a get call fails for any reason other than Not Found
func Exists(kind string, name string, namespace string, args ...string) (bool, error) {
get := []string{"get", kind, name, "-n", namespace}
_, err := kubectl(append(get, args...)...)
if err, ok := err.(NotFoundError); ok {
if ok {
return false, nil
}
return false, err
}
return true, nil
}
// Exec interactive exec into a pod with a series of args to run
func Exec(name string, namespace string, args ...string) error {
execArgs := []string{"-n", namespace, "exec", "-it", name}
execArgs = append(execArgs, args...)
return kubectlIO(execArgs...)
}
// PortForward forward local requests to a running pod
func PortForward(podName string, namespace string, ports []string, args ...string) error {
portForwardArgs := []string{"port-forward", podName}
portForwardArgs = append(append(append(portForwardArgs, args...), ports...), "-n", namespace)
return kubectlIO(portForwardArgs...)
}
type unmarshalledList struct {
Items []interface{} `json:"items"`
}
// List represents a nested list of Items
type List struct {
Items [][]byte
}
// ListKind returns a List resource, with an Items slice of raw yamls
func ListKind(kind string, namespace string, args ...string) (List, error) {
get := []string{"get", kind, "-n", namespace, "-o", "json"}
out, err := kubectl(append(get, args...)...)
if err != nil {
return List{}, err
}
var unmarshalled unmarshalledList
err = json.Unmarshal(out, &unmarshalled)
if err != nil {
return List{}, err
}
var l List
for _, resource := range unmarshalled.Items {
marshalled, marshalErr := json.Marshal(resource)
if marshalErr != nil {
return List{}, marshalErr
}
l.Items = append(l.Items, marshalled)
}
return l, nil
}
// UseCluster switch current configured kubectl cluster
func UseCluster(cluster string) error {
_, err := kubectl([]string{"config", "use-context", cluster}...)
return err
}
// CanI is for authorization checks
func CanI(namespace string, verb string, objectType string, args ...string) (bool, error) {
canDeploy := []string{"auth", "can-i", verb, objectType, "-n", namespace}
out, err := kubectl(append(canDeploy, args...)...)
if err != nil {
return false, err
}
return strings.Trim(string(out), "\r\n") == "yes", nil
}
func CanIAllNamespaces(verb string, objectType string, args ...string) (bool, error) {
canDeploy := []string{"auth", "can-i", verb, objectType, "--all-namespaces"}
out, err := kubectl(append(canDeploy, args...)...)
if err != nil {
return false, err
}
return strings.Trim(string(out), "\r\n") == "yes", nil
}
// CurrentCluster the current configured kubectl cluster
func CurrentCluster() (string, error) {
out, err := kubectl([]string{"config", "current-context"}...)
if err != nil {
return "", err
}
return strings.Trim(string(out), "\r\n"), nil
}