/
config.go
347 lines (284 loc) Β· 7.97 KB
/
config.go
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package client
import (
"errors"
"fmt"
"strings"
"sync"
"time"
"github.com/derailed/popeye/types"
"github.com/rs/zerolog/log"
v1 "k8s.io/api/core/v1"
"k8s.io/cli-runtime/pkg/genericclioptions"
restclient "k8s.io/client-go/rest"
clientcmd "k8s.io/client-go/tools/clientcmd"
clientcmdapi "k8s.io/client-go/tools/clientcmd/api"
)
const (
defaultQPS = 100
defaultBurst = 100
defaultCallTimeoutDuration time.Duration = 30 * time.Second
)
// Config tracks a kubernetes configuration.
type Config struct {
flags *genericclioptions.ConfigFlags
clientConfig clientcmd.ClientConfig
currentContext string
rawConfig *clientcmdapi.Config
restConfig *restclient.Config
mutex *sync.RWMutex
}
var _ types.Config = (*Config)(nil)
// NewConfig returns a new k8s config or an error if the flags are invalid.
func NewConfig(f *genericclioptions.ConfigFlags) *Config {
return &Config{
flags: f,
mutex: &sync.RWMutex{},
}
}
// CallTimeout returns the call timeout if set or the default if not set.
func (c *Config) CallTimeout() time.Duration {
if c.flags.Timeout == nil {
return defaultCallTimeoutDuration
}
dur, err := time.ParseDuration(*c.flags.Timeout)
if err != nil {
return defaultCallTimeoutDuration
}
return dur
}
// Flags returns configuration flags.
func (c *Config) Flags() *genericclioptions.ConfigFlags {
return c.flags
}
func (c *Config) reset() {
c.clientConfig, c.rawConfig, c.restConfig = nil, nil, 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 "", err
}
return cfg.CurrentContext, nil
}
// GetContext fetch a given context or error if it does not exists.
func (c *Config) GetContext(n string) (*clientcmdapi.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("invalid context `%s specified", n)
}
// Contexts fetch all available contexts.
func (c *Config) Contexts() (map[string]*clientcmdapi.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)
return clientcmd.ModifyConfig(c.clientConfig.ConfigAccess(), cfg, true)
}
// ContextNames fetch all available contexts.
func (c *Config) ContextNames() ([]string, error) {
cfg, err := c.RawConfig()
if err != nil {
return nil, err
}
cc := make([]string, 0, len(cfg.Contexts))
for n := range cfg.Contexts {
cc = append(cc, n)
}
return cc, nil
}
// ClusterNameFromContext returns the cluster associated with the given context.
func (c *Config) ClusterNameFromContext(ctx string) (string, error) {
cfg, err := c.RawConfig()
if err != nil {
return "", err
}
if ctx, ok := cfg.Contexts[ctx]; ok {
return ctx.Cluster, nil
}
return "", fmt.Errorf("unable to locate cluster from context %s", ctx)
}
// CurrentClusterName returns the 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
}
current := cfg.CurrentContext
if isSet(c.flags.Context) {
current = *c.flags.Context
}
if ctx, ok := cfg.Contexts[current]; ok {
return ctx.Cluster, nil
}
return "", errors.New("unable to locate current cluster")
}
// ClusterNames fetch all kubeconfig defined clusters.
func (c *Config) ClusterNames() ([]string, error) {
cfg, err := c.RawConfig()
if err != nil {
return nil, err
}
cc := make([]string, 0, len(cfg.Clusters))
for name := range cfg.Clusters {
cc = append(cc, name)
}
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 groupsif 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) {
if c.flags.Namespace != nil {
return *c.flags.Namespace, nil
}
cfg, err := c.RawConfig()
if err != nil {
return "", err
}
ctx, err := c.CurrentContextName()
if err != nil {
return "", err
}
if ctx, ok := cfg.Contexts[ctx]; ok {
if isSet(&ctx.Namespace) {
return ctx.Namespace, nil
}
}
return "", fmt.Errorf("No active namespace specified")
}
// NamespaceNames fetch all available namespaces on current cluster.
func (c *Config) NamespaceNames(nns []v1.Namespace) []string {
nn := make([]string, 0, len(nns))
for _, ns := range nns {
nn = append(nn, ns.Name)
}
return nn
}
// ConfigAccess return the current kubeconfig api server access configuration.
func (c *Config) ConfigAccess() (clientcmd.ConfigAccess, error) {
c.mutex.RLock()
defer c.mutex.RUnlock()
c.ensureConfig()
return c.clientConfig.ConfigAccess(), nil
}
// RawConfig fetch the current kubeconfig with no overrides.
func (c *Config) RawConfig() (clientcmdapi.Config, error) {
c.mutex.Lock()
defer c.mutex.Unlock()
if c.rawConfig != nil {
if c.rawConfig.CurrentContext == c.currentContext {
return *c.rawConfig, nil
}
log.Debug().Msgf("Context switch detected... %s vs %s", c.rawConfig.CurrentContext, c.currentContext)
c.currentContext = c.rawConfig.CurrentContext
c.reset()
return *c.rawConfig, nil
}
c.ensureConfig()
cfg, err := c.clientConfig.RawConfig()
if err != nil {
return cfg, err
}
c.rawConfig = &cfg
c.currentContext = cfg.CurrentContext
return *c.rawConfig, nil
}
// RESTConfig fetch the current REST api service connection.
func (c *Config) RESTConfig() (*restclient.Config, error) {
if c.restConfig != nil {
return c.restConfig, nil
}
var err error
if c.restConfig, err = c.flags.ToRESTConfig(); err != nil {
return nil, err
}
c.restConfig.QPS = defaultQPS
c.restConfig.Burst = defaultBurst
c.restConfig.Timeout = defaultCallTimeoutDuration
restclient.SetDefaultWarningHandler(newLoggerHandler())
log.Debug().Msgf("Connecting to API Server %s", c.restConfig.Host)
return c.restConfig, nil
}
type loggerHandler struct{}
func newLoggerHandler() loggerHandler {
return loggerHandler{}
}
func (l loggerHandler) HandleWarningHeader(code int, agent string, text string) {
log.Warn().Msgf("[%d] (%q) -- %s", code, agent, text)
}
func (c *Config) ensureConfig() {
if c.clientConfig != nil {
return
}
log.Debug().Msg("Loading raw config from flags...")
c.clientConfig = c.flags.ToRawKubeConfigLoader()
}
// ----------------------------------------------------------------------------
// Helpers...
func isSet(s *string) bool {
return s != nil && len(*s) != 0
}
func areSet(s *[]string) bool {
return s != nil && len(*s) != 0
}