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kube.go
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kube.go
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package kube
import (
"encoding/base64"
"fmt"
"io/ioutil"
"os"
"path/filepath"
"strings"
"time"
"k8s.io/apimachinery/pkg/api/meta"
"k8s.io/apimachinery/pkg/runtime/schema"
"k8s.io/client-go/discovery"
diskcached "k8s.io/client-go/discovery/cached/disk"
"k8s.io/client-go/dynamic"
"k8s.io/client-go/kubernetes"
_ "k8s.io/client-go/plugin/pkg/client/auth/azure"
_ "k8s.io/client-go/plugin/pkg/client/auth/exec"
_ "k8s.io/client-go/plugin/pkg/client/auth/gcp"
_ "k8s.io/client-go/plugin/pkg/client/auth/oidc"
"k8s.io/client-go/rest"
"k8s.io/client-go/restmapper"
"k8s.io/client-go/tools/clientcmd"
"github.com/werf/kubedog/pkg/utils"
)
const (
kubeTokenFilePath = "/var/run/secrets/kubernetes.io/serviceaccount/token"
kubeNamespaceFilePath = "/var/run/secrets/kubernetes.io/serviceaccount/namespace"
)
var (
Kubernetes kubernetes.Interface
Client kubernetes.Interface
DynamicClient dynamic.Interface
CachedDiscoveryClient discovery.CachedDiscoveryInterface
Mapper meta.RESTMapper
DefaultNamespace string
Context string
)
type InitOptions struct {
KubeConfigOptions
}
func Init(opts InitOptions) error {
config, err := GetKubeConfig(opts.KubeConfigOptions)
if err != nil {
return err
}
if config != nil {
clientset, err := kubernetes.NewForConfig(config.Config)
if err != nil {
return err
}
Kubernetes = clientset
Client = clientset
dynamicClient, err := dynamic.NewForConfig(config.Config)
if err != nil {
return err
}
DynamicClient = dynamicClient
CachedDiscoveryClient, err = cachedDiscoveryClient(*config.Config)
if err != nil {
return fmt.Errorf("error getting cached discovery client: %w", err)
}
Mapper = restMapper(&CachedDiscoveryClient)
}
return nil
}
type KubeConfigOptions struct {
Context string
ConfigPath string
ConfigDataBase64 string
ConfigPathMergeList []string
}
type KubeConfig struct {
Config *rest.Config
Context string
DefaultNamespace string
}
func GetKubeConfig(opts KubeConfigOptions) (*KubeConfig, error) {
// Try to load from kubeconfig in flags or from ~/.kube/config
config, outOfClusterErr := getOutOfClusterConfig(opts.Context, opts.ConfigPath, opts.ConfigDataBase64, opts.ConfigPathMergeList)
if config == nil {
if hasInClusterConfig() {
// Try to configure as inCluster
if config, err := getInClusterConfig(); err != nil {
if opts.ConfigPath != "" || opts.Context != "" || opts.ConfigDataBase64 != "" {
if outOfClusterErr != nil {
return nil, fmt.Errorf("out-of-cluster config error: %w, in-cluster config error: %w", outOfClusterErr, err)
}
} else {
return nil, err
}
} else if config != nil {
return config, nil
}
} else {
// if not in cluster return outOfCluster error
if outOfClusterErr != nil {
return nil, outOfClusterErr
}
}
return nil, nil
}
return config, outOfClusterErr
}
type GetAllContextsClientsOptions struct {
ConfigPath string
ConfigDataBase64 string
ConfigPathMergeList []string
}
type ContextClient struct {
ContextName string
ContextNamespace string
Client kubernetes.Interface
}
func GetAllContextsClients(opts GetAllContextsClientsOptions) ([]*ContextClient, error) {
// Try to load contexts from kubeconfig in flags or from ~/.kube/config
var outOfClusterErr error
contexts, outOfClusterErr := getOutOfClusterContextsClients(opts.ConfigPath, opts.ConfigDataBase64, opts.ConfigPathMergeList)
// return if contexts are loaded successfully
if len(contexts) > 0 {
return contexts, nil
}
if hasInClusterConfig() {
contextClient, err := getInClusterContextClient()
if err != nil {
return nil, err
}
return []*ContextClient{contextClient}, nil
}
// if not in cluster return outOfCluster error
if outOfClusterErr != nil {
return nil, outOfClusterErr
}
return nil, nil
}
func makeOutOfClusterClientConfigError(configPath, context string, err error) error {
baseErrMsg := "out-of-cluster configuration problem"
if configPath != "" {
baseErrMsg += fmt.Sprintf(", custom kube config path is %q", configPath)
}
if context != "" {
baseErrMsg += fmt.Sprintf(", custom kube context is %q", context)
}
return fmt.Errorf("%s: %w", baseErrMsg, err)
}
func setConfigPathMergeListEnvironment(configPathMergeList []string) error {
configPathEnvVar := strings.Join(configPathMergeList, string(filepath.ListSeparator))
if err := os.Setenv(clientcmd.RecommendedConfigPathEnvVar, configPathEnvVar); err != nil {
return fmt.Errorf("unable to set env var %q: %w", clientcmd.RecommendedConfigPathEnvVar, err)
}
return nil
}
func GetClientConfig(context, configPath string, configData []byte, configPathMergeList []string) (clientcmd.ClientConfig, error) {
overrides := &clientcmd.ConfigOverrides{ClusterDefaults: clientcmd.ClusterDefaults}
if context != "" {
overrides.CurrentContext = context
}
if configData != nil {
config, err := clientcmd.Load(configData)
if err != nil {
return nil, fmt.Errorf("unable to load config data: %w", err)
}
return clientcmd.NewDefaultClientConfig(*config, overrides), nil
}
if len(configPathMergeList) > 0 {
if err := setConfigPathMergeListEnvironment(configPathMergeList); err != nil {
return nil, err
}
}
rules := clientcmd.NewDefaultClientConfigLoadingRules()
rules.DefaultClientConfig = &clientcmd.DefaultClientConfig
if configPath != "" {
rules.ExplicitPath = configPath
}
return clientcmd.NewNonInteractiveDeferredLoadingClientConfig(rules, overrides), nil
}
func hasInClusterConfig() bool {
token, _ := utils.FileExists(kubeTokenFilePath)
ns, _ := utils.FileExists(kubeNamespaceFilePath)
return token && ns
}
func parseConfigDataBase64(configDataBase64 string) ([]byte, error) {
var configData []byte
if configDataBase64 != "" {
if data, err := base64.StdEncoding.DecodeString(configDataBase64); err != nil {
return nil, fmt.Errorf("unable to decode base64 config data: %w", err)
} else {
configData = data
}
}
return configData, nil
}
func getOutOfClusterConfig(context, configPath, configDataBase64 string, configPathMergeList []string) (*KubeConfig, error) {
res := &KubeConfig{}
configData, err := parseConfigDataBase64(configDataBase64)
if err != nil {
return nil, fmt.Errorf("unable to parse base64 config data: %w", err)
}
clientConfig, err := GetClientConfig(context, configPath, configData, configPathMergeList)
if err != nil {
return nil, makeOutOfClusterClientConfigError(configPath, context, err)
}
if ns, _, err := clientConfig.Namespace(); err != nil {
return nil, fmt.Errorf("cannot determine default kubernetes namespace: %w", err)
} else {
res.DefaultNamespace = ns
}
config, err := clientConfig.ClientConfig()
if err != nil {
return nil, makeOutOfClusterClientConfigError(configPath, context, err)
}
if config == nil {
return nil, nil
}
res.Config = config
if context == "" {
if rc, err := clientConfig.RawConfig(); err != nil {
return nil, fmt.Errorf("cannot get raw kubernetes config: %w", err)
} else {
res.Context = rc.CurrentContext
}
} else {
res.Context = context
}
return res, nil
}
func getOutOfClusterContextsClients(configPath, configDataBase64 string, configPathMergeList []string) ([]*ContextClient, error) {
var res []*ContextClient
configData, err := parseConfigDataBase64(configDataBase64)
if err != nil {
return nil, fmt.Errorf("unable to parse base64 config data: %w", err)
}
clientConfig, err := GetClientConfig("", configPath, configData, configPathMergeList)
if err != nil {
return nil, err
}
rc, err := clientConfig.RawConfig()
if err != nil {
return nil, err
}
for contextName, context := range rc.Contexts {
clientConfig, err := GetClientConfig(contextName, configPath, configData, configPathMergeList)
if err != nil {
return nil, makeOutOfClusterClientConfigError(configPath, contextName, err)
}
config, err := clientConfig.ClientConfig()
if err != nil {
return nil, makeOutOfClusterClientConfigError(configPath, contextName, err)
}
clientset, err := kubernetes.NewForConfig(config)
if err != nil {
return nil, err
}
res = append(res, &ContextClient{
ContextName: contextName,
ContextNamespace: context.Namespace,
Client: clientset,
})
}
return res, nil
}
func getInClusterConfig() (*KubeConfig, error) {
res := &KubeConfig{}
if config, err := rest.InClusterConfig(); err != nil {
return nil, fmt.Errorf("in-cluster configuration problem: %w", err)
} else {
res.Config = config
}
if data, err := ioutil.ReadFile(kubeNamespaceFilePath); err != nil {
return nil, fmt.Errorf("in-cluster configuration problem: cannot determine default kubernetes namespace: error reading %s: %w", kubeNamespaceFilePath, err)
} else {
res.DefaultNamespace = string(data)
}
return res, nil
}
func getInClusterContextClient() (*ContextClient, error) {
kubeConfig, err := getInClusterConfig()
if err != nil {
return nil, err
}
clientset, err := kubernetes.NewForConfig(kubeConfig.Config)
if err != nil {
return nil, err
}
return &ContextClient{
ContextName: "inClusterContext",
ContextNamespace: kubeConfig.DefaultNamespace,
Client: clientset,
}, nil
}
func GroupVersionResourceByKind(client kubernetes.Interface, kind string) (schema.GroupVersionResource, error) {
lists, err := client.Discovery().ServerPreferredResources()
if err != nil {
return schema.GroupVersionResource{}, err
}
for _, list := range lists {
if len(list.APIResources) == 0 {
continue
}
gv, err := schema.ParseGroupVersion(list.GroupVersion)
if err != nil {
continue
}
for _, resource := range list.APIResources {
if len(resource.Verbs) == 0 {
continue
}
if kind == resource.Kind {
groupVersionResource := schema.GroupVersionResource{
Resource: resource.Name,
Group: gv.Group,
Version: gv.Version,
}
return groupVersionResource, nil
}
}
}
return schema.GroupVersionResource{}, fmt.Errorf("kind %s is not supported", kind)
}
func cachedDiscoveryClient(config rest.Config) (discovery.CachedDiscoveryInterface, error) {
config.Burst = 100
cacheDir := defaultCacheDir
httpCacheDir := filepath.Join(cacheDir, "http")
discoveryCacheDir := computeDiscoverCacheDir(filepath.Join(cacheDir, "discovery"), config.Host)
return diskcached.NewCachedDiscoveryClientForConfig(&config, discoveryCacheDir, httpCacheDir, time.Duration(10*time.Minute))
}
func restMapper(cachedDiscoveryClient *discovery.CachedDiscoveryInterface) meta.RESTMapper {
mapper := restmapper.NewDeferredDiscoveryRESTMapper(*cachedDiscoveryClient)
return restmapper.NewShortcutExpander(mapper, *cachedDiscoveryClient)
}