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/
etcd.go
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/
etcd.go
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// The etcd backend fetches control plane objects directly from etcd. This is adapted heavily from
// kubernetes/staging/src/k8s.io/apiserver/pkg/storage/etcd3/store.go.
package recovery
import (
"context"
"fmt"
"os"
"path"
"strings"
"github.com/kubernetes-incubator/bootkube/pkg/asset"
"github.com/coreos/etcd/clientv3"
"k8s.io/apimachinery/pkg/api/meta"
"k8s.io/apimachinery/pkg/runtime"
"k8s.io/client-go/kubernetes/scheme"
)
// etcdBackend is a backend that extracts a controlPlane from an etcd instance.
type etcdBackend struct {
client *clientv3.Client
decoder runtime.Decoder
pathPrefix string
}
// NewEtcdBackend constructs a new etcdBackend for the given client and pathPrefix.
func NewEtcdBackend(client *clientv3.Client, pathPrefix string) Backend {
return &etcdBackend{
client: client,
decoder: scheme.Codecs.UniversalDecoder(),
pathPrefix: pathPrefix,
}
}
// read implements Backend.read().
func (s *etcdBackend) read(ctx context.Context) (*controlPlane, error) {
cp := &controlPlane{}
for _, r := range []struct {
etcdKeyName string
obj runtime.Object
}{{
etcdKeyName: "configmaps",
obj: &cp.configMaps,
}, {
etcdKeyName: "daemonsets",
obj: &cp.daemonSets,
}, {
etcdKeyName: "deployments",
obj: &cp.deployments,
}, {
etcdKeyName: "secrets",
obj: &cp.secrets,
}} {
if err := s.list(ctx, r.etcdKeyName, r.obj); err != nil {
return nil, err
}
}
return cp, nil
}
// get fetches a single runtime.Object with key `key` from etcd.
func (s *etcdBackend) get(ctx context.Context, key string, out runtime.Object, ignoreNotFound bool) error {
key = path.Join(s.pathPrefix, key, "kube-system")
getResp, err := s.client.KV.Get(ctx, key)
if err != nil {
return err
}
if len(getResp.Kvs) == 0 {
if ignoreNotFound {
return runtime.SetZeroValue(out)
}
return fmt.Errorf("key not found: %s", key)
}
kv := getResp.Kvs[0]
return decode(s.decoder, kv.Value, out)
}
func (s *etcdBackend) getBytes(ctx context.Context, key string) ([]byte, error) {
key = path.Join(s.pathPrefix, key)
getResp, err := s.client.KV.Get(ctx, key)
if err != nil {
return nil, err
}
if len(getResp.Kvs) == 0 {
return nil, fmt.Errorf("key not found: %s", key)
}
return getResp.Kvs[0].Value, nil
}
// list fetches a list runtime.Object from etcd located at key prefix `key`.
func (s *etcdBackend) list(ctx context.Context, key string, listObj runtime.Object) error {
listPtr, err := meta.GetItemsPtr(listObj)
if err != nil {
return err
}
key = path.Join(s.pathPrefix, key, "kube-system")
if !strings.HasSuffix(key, "/") {
key += "/"
}
getResp, err := s.client.KV.Get(ctx, key, clientv3.WithPrefix())
if err != nil {
return err
}
elems := make([][]byte, len(getResp.Kvs))
for i, kv := range getResp.Kvs {
elems[i] = kv.Value
}
return decodeList(elems, listPtr, s.decoder)
}
const (
assetPathRecoveryEtcd = "recovery-etcd.yaml"
etcdCRDKey = "etcd.database.coreos.com/etcdclusters/kube-system/kube-etcd"
etcdMemberPodPrefix = "pods/kube-system/kube-etcd-"
RecoveryEtcdClientAddr = "http://localhost:52379"
)
// StartRecoveryEtcdForBackup starts a recovery etcd container using given backup.
// The started etcd server listens on RecoveryEtcdClientAddr.
func StartRecoveryEtcdForBackup(p, backupPath string) error {
d, f := path.Split(backupPath)
config := struct {
Image string
BackupFile string
BackupDir string
ClientAddr string
}{
Image: asset.DefaultImages.Etcd,
BackupFile: f,
BackupDir: d,
ClientAddr: RecoveryEtcdClientAddr,
}
as := asset.MustCreateAssetFromTemplate(assetPathRecoveryEtcd, recoveryEtcdTemplate, config)
return as.WriteFile(p)
}
// CleanRecoveryEtcd removes the recovery etcd static pod manifest and stops the recovery
// etcd container.
func CleanRecoveryEtcd(p string) error {
return os.Remove(path.Join(p, assetPathRecoveryEtcd))
}
func stripPort(hostport string) string {
colon := strings.IndexByte(hostport, ':')
if colon == -1 {
return hostport
}
if i := strings.IndexByte(hostport, ']'); i != -1 {
return strings.TrimPrefix(hostport[:i], "[")
}
return hostport[:colon]
}