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config.go
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config.go
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// SPDX-License-Identifier: Apache-2.0
// Copyright Authors of K9s
package client
import (
"errors"
"fmt"
"strings"
"sync"
"time"
"k8s.io/cli-runtime/pkg/genericclioptions"
restclient "k8s.io/client-go/rest"
clientcmd "k8s.io/client-go/tools/clientcmd"
"k8s.io/client-go/tools/clientcmd/api"
)
const (
defaultCallTimeoutDuration time.Duration = 15 * time.Second
// UsePersistentConfig caches client config to avoid reloads.
UsePersistentConfig = true
)
// Config tracks a kubernetes configuration.
type Config struct {
flags *genericclioptions.ConfigFlags
mx sync.RWMutex
}
// NewConfig returns a new k8s config or an error if the flags are invalid.
func NewConfig(f *genericclioptions.ConfigFlags) *Config {
return &Config{
flags: f,
}
}
// CallTimeout returns the call timeout if set or the default if not set.
func (c *Config) CallTimeout() time.Duration {
if !isSet(c.flags.Timeout) {
return defaultCallTimeoutDuration
}
dur, err := time.ParseDuration(*c.flags.Timeout)
if err != nil {
return defaultCallTimeoutDuration
}
return dur
}
func (c *Config) RESTConfig() (*restclient.Config, error) {
return c.clientConfig().ClientConfig()
}
// Flags returns configuration flags.
func (c *Config) Flags() *genericclioptions.ConfigFlags {
return c.flags
}
func (c *Config) RawConfig() (api.Config, error) {
return c.clientConfig().RawConfig()
}
func (c *Config) clientConfig() clientcmd.ClientConfig {
return c.flags.ToRawKubeConfigLoader()
}
func (c *Config) reset() {}
// SwitchContext changes the kubeconfig context to a new cluster.
func (c *Config) SwitchContext(name string) error {
ct, err := c.GetContext(name)
if err != nil {
return fmt.Errorf("context %q does not exist", name)
}
// !!BOZO!! Do you need to reset the flags?
flags := genericclioptions.NewConfigFlags(UsePersistentConfig)
flags.Context, flags.ClusterName = &name, &ct.Cluster
flags.Namespace = c.flags.Namespace
flags.Timeout = c.flags.Timeout
flags.KubeConfig = c.flags.KubeConfig
c.flags = flags
return nil
}
func (c *Config) Clone(ns string) (*genericclioptions.ConfigFlags, error) {
flags := genericclioptions.NewConfigFlags(false)
ct, err := c.CurrentContextName()
if err != nil {
return nil, err
}
cl, err := c.CurrentClusterName()
if err != nil {
return nil, err
}
flags.Context, flags.ClusterName = &ct, &cl
flags.Namespace = &ns
flags.Timeout = c.Flags().Timeout
flags.KubeConfig = c.Flags().KubeConfig
return flags, nil
}
// CurrentClusterName returns the currently active cluster name.
func (c *Config) CurrentClusterName() (string, error) {
if isSet(c.flags.ClusterName) {
return *c.flags.ClusterName, nil
}
cfg, err := c.RawConfig()
if err != nil {
return "", err
}
ct, ok := cfg.Contexts[cfg.CurrentContext]
if !ok {
return "", fmt.Errorf("invalid current context specified: %q", cfg.CurrentContext)
}
if isSet(c.flags.Context) {
ct, ok = cfg.Contexts[*c.flags.Context]
if !ok {
return "", fmt.Errorf("current-cluster - invalid context specified: %q", *c.flags.Context)
}
}
return ct.Cluster, nil
}
// CurrentContextName returns the currently active config context.
func (c *Config) CurrentContextName() (string, error) {
if isSet(c.flags.Context) {
return *c.flags.Context, nil
}
cfg, err := c.RawConfig()
if err != nil {
return "", fmt.Errorf("fail to load rawConfig: %w", err)
}
return cfg.CurrentContext, nil
}
func (c *Config) CurrentContextNamespace() (string, error) {
name, err := c.CurrentContextName()
if err != nil {
return "", err
}
context, err := c.GetContext(name)
if err != nil {
return "", err
}
return context.Namespace, nil
}
// CurrentContext returns the current context configuration.
func (c *Config) CurrentContext() (*api.Context, error) {
n, err := c.CurrentContextName()
if err != nil {
return nil, err
}
return c.GetContext(n)
}
// GetContext fetch a given context or error if it does not exists.
func (c *Config) GetContext(n string) (*api.Context, error) {
cfg, err := c.RawConfig()
if err != nil {
return nil, err
}
if c, ok := cfg.Contexts[n]; ok {
return c, nil
}
return nil, fmt.Errorf("getcontext - invalid context specified: %q", n)
}
// Contexts fetch all available contexts.
func (c *Config) Contexts() (map[string]*api.Context, error) {
cfg, err := c.RawConfig()
if err != nil {
return nil, err
}
return cfg.Contexts, nil
}
// DelContext remove a given context from the configuration.
func (c *Config) DelContext(n string) error {
cfg, err := c.RawConfig()
if err != nil {
return err
}
delete(cfg.Contexts, n)
acc, err := c.ConfigAccess()
if err != nil {
return err
}
return clientcmd.ModifyConfig(acc, cfg, true)
}
// RenameContext renames a context.
func (c *Config) RenameContext(old string, new string) error {
cfg, err := c.RawConfig()
if err != nil {
return err
}
if _, ok := cfg.Contexts[new]; ok {
return fmt.Errorf("context with name %s already exists", new)
}
cfg.Contexts[new] = cfg.Contexts[old]
delete(cfg.Contexts, old)
acc, err := c.ConfigAccess()
if err != nil {
return err
}
if e := clientcmd.ModifyConfig(acc, cfg, true); e != nil {
return e
}
current, err := c.CurrentContextName()
if err != nil {
return err
}
if current == old {
return c.SwitchContext(new)
}
return nil
}
// ContextNames fetch all available contexts.
func (c *Config) ContextNames() (map[string]struct{}, error) {
cfg, err := c.RawConfig()
if err != nil {
return nil, err
}
cc := make(map[string]struct{}, len(cfg.Contexts))
for n := range cfg.Contexts {
cc[n] = struct{}{}
}
return cc, nil
}
// CurrentGroupNames retrieves the active group names.
func (c *Config) CurrentGroupNames() ([]string, error) {
if areSet(c.flags.ImpersonateGroup) {
return *c.flags.ImpersonateGroup, nil
}
return []string{}, errors.New("unable to locate current group")
}
// ImpersonateGroups retrieves the active groups if set on the CLI.
func (c *Config) ImpersonateGroups() (string, error) {
if areSet(c.flags.ImpersonateGroup) {
return strings.Join(*c.flags.ImpersonateGroup, ","), nil
}
return "", errors.New("no groups set")
}
// ImpersonateUser retrieves the active user name if set on the CLI.
func (c *Config) ImpersonateUser() (string, error) {
if isSet(c.flags.Impersonate) {
return *c.flags.Impersonate, nil
}
return "", errors.New("no user set")
}
// CurrentUserName retrieves the active user name.
func (c *Config) CurrentUserName() (string, error) {
if isSet(c.flags.Impersonate) {
return *c.flags.Impersonate, nil
}
if isSet(c.flags.AuthInfoName) {
return *c.flags.AuthInfoName, nil
}
cfg, err := c.RawConfig()
if err != nil {
return "", err
}
current := cfg.CurrentContext
if isSet(c.flags.Context) {
current = *c.flags.Context
}
if ctx, ok := cfg.Contexts[current]; ok {
return ctx.AuthInfo, nil
}
return "", errors.New("unable to locate current user")
}
// CurrentNamespaceName retrieves the active namespace.
func (c *Config) CurrentNamespaceName() (string, error) {
ns, overridden, err := c.clientConfig().Namespace()
if err != nil {
return BlankNamespace, err
}
// Checks if ns is passed is in args.
if overridden {
return ns, nil
}
// Return ns set in context if any??
return c.CurrentContextNamespace()
}
// ConfigAccess return the current kubeconfig api server access configuration.
func (c *Config) ConfigAccess() (clientcmd.ConfigAccess, error) {
c.mx.RLock()
defer c.mx.RUnlock()
return c.clientConfig().ConfigAccess(), nil
}
// ----------------------------------------------------------------------------
// Helpers...
func isSet(s *string) bool {
return s != nil && len(*s) != 0
}
func areSet(s *[]string) bool {
return s != nil && len(*s) != 0
}