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etcdhelper.go
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etcdhelper.go
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package main
import (
"bytes"
"context"
"crypto/tls"
"encoding/json"
"flag"
"fmt"
"os"
"time"
jsonserializer "k8s.io/apimachinery/pkg/runtime/serializer/json"
"k8s.io/kubernetes/pkg/api"
"github.com/coreos/etcd/clientv3"
"github.com/coreos/etcd/pkg/transport"
// install all APIs
_ "github.com/openshift/origin/pkg/api/install"
_ "github.com/openshift/origin/pkg/quota/apis/quota/install"
apiregistration "k8s.io/kube-aggregator/pkg/apis/apiregistration/install"
_ "k8s.io/kubernetes/pkg/api/install"
)
func init() {
apiregistration.Install(api.GroupFactoryRegistry, api.Registry, api.Scheme)
}
func main() {
var endpoint, keyFile, certFile, caFile string
flag.StringVar(&endpoint, "endpoint", "https://127.0.0.1:4001", "Etcd endpoint.")
flag.StringVar(&keyFile, "key", "", "TLS client key.")
flag.StringVar(&certFile, "cert", "", "TLS client certificate.")
flag.StringVar(&caFile, "cacert", "", "Server TLS CA certificate.")
flag.Parse()
if flag.NArg() == 0 {
fmt.Fprint(os.Stderr, "ERROR: you need to specify action: dump or ls [<key>] or get <key>\n")
os.Exit(1)
}
if flag.Arg(0) == "get" && flag.NArg() == 1 {
fmt.Fprint(os.Stderr, "ERROR: you need to specify <key> for get operation\n")
os.Exit(1)
}
if flag.Arg(0) == "dump" && flag.NArg() != 1 {
fmt.Fprint(os.Stderr, "ERROR: you cannot specify positional arguments with dump\n")
os.Exit(1)
}
action := flag.Arg(0)
key := ""
if flag.NArg() > 1 {
key = flag.Arg(1)
}
var tlsConfig *tls.Config
if len(certFile) != 0 || len(keyFile) != 0 || len(caFile) != 0 {
tlsInfo := transport.TLSInfo{
CertFile: certFile,
KeyFile: keyFile,
CAFile: caFile,
}
var err error
tlsConfig, err = tlsInfo.ClientConfig()
if err != nil {
fmt.Fprintf(os.Stderr, "ERROR: unable to create client config: %v\n", err)
os.Exit(1)
}
}
config := clientv3.Config{
Endpoints: []string{endpoint},
TLS: tlsConfig,
DialTimeout: 5 * time.Second,
}
client, err := clientv3.New(config)
if err != nil {
fmt.Fprintf(os.Stderr, "ERROR: unable to connect to etcd: %v\n", err)
os.Exit(1)
}
defer client.Close()
switch action {
case "ls":
err = listKeys(client, key)
case "get":
err = getKey(client, key)
case "dump":
err = dump(client)
default:
fmt.Fprintf(os.Stderr, "ERROR: invalid action: %s\n", action)
os.Exit(1)
}
if err != nil {
fmt.Fprintf(os.Stderr, "ERROR: %s-ing %s: %v\n", action, key, err)
os.Exit(1)
}
}
func listKeys(client *clientv3.Client, key string) error {
var resp *clientv3.GetResponse
var err error
if len(key) == 0 {
resp, err = clientv3.NewKV(client).Get(context.Background(), "/", clientv3.WithFromKey(), clientv3.WithKeysOnly())
} else {
resp, err = clientv3.NewKV(client).Get(context.Background(), key, clientv3.WithPrefix(), clientv3.WithKeysOnly())
}
if err != nil {
return err
}
for _, kv := range resp.Kvs {
fmt.Println(string(kv.Key))
}
return nil
}
func getKey(client *clientv3.Client, key string) error {
resp, err := clientv3.NewKV(client).Get(context.Background(), key)
if err != nil {
return err
}
decoder := api.Codecs.UniversalDeserializer()
encoder := jsonserializer.NewSerializer(jsonserializer.DefaultMetaFactory, api.Scheme, api.Scheme, true)
for _, kv := range resp.Kvs {
obj, gvk, err := decoder.Decode(kv.Value, nil, nil)
if err != nil {
fmt.Fprintf(os.Stderr, "WARN: unable to decode %s: %v\n", kv.Key, err)
continue
}
fmt.Println(gvk)
err = encoder.Encode(obj, os.Stdout)
if err != nil {
fmt.Fprintf(os.Stderr, "WARN: unable to decode %s: %v\n", kv.Key, err)
continue
}
}
return nil
}
func dump(client *clientv3.Client) error {
response, err := clientv3.NewKV(client).Get(context.Background(), "/", clientv3.WithPrefix(), clientv3.WithSort(clientv3.SortByKey, clientv3.SortDescend))
if err != nil {
return err
}
kvData := []etcd3kv{}
decoder := api.Codecs.UniversalDeserializer()
encoder := jsonserializer.NewSerializer(jsonserializer.DefaultMetaFactory, api.Scheme, api.Scheme, false)
objJSON := &bytes.Buffer{}
for _, kv := range response.Kvs {
obj, _, err := decoder.Decode(kv.Value, nil, nil)
if err != nil {
fmt.Fprintf(os.Stderr, "WARN: error decoding value %q: %v\n", string(kv.Value), err)
continue
}
objJSON.Reset()
if err := encoder.Encode(obj, objJSON); err != nil {
fmt.Fprintf(os.Stderr, "WARN: error encoding object %#v as JSON: %v", obj, err)
continue
}
kvData = append(
kvData,
etcd3kv{
Key: string(kv.Key),
Value: string(objJSON.Bytes()),
CreateRevision: kv.CreateRevision,
ModRevision: kv.ModRevision,
Version: kv.Version,
Lease: kv.Lease,
},
)
}
jsonData, err := json.MarshalIndent(kvData, "", " ")
if err != nil {
return err
}
fmt.Println(string(jsonData))
return nil
}
type etcd3kv struct {
Key string `json:"key,omitempty"`
Value string `json:"value,omitempty"`
CreateRevision int64 `json:"create_revision,omitempty"`
ModRevision int64 `json:"mod_revision,omitempty"`
Version int64 `json:"version,omitempty"`
Lease int64 `json:"lease,omitempty"`
}