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package etcd
import (
"context"
"fmt"
"strings"
"time"
"go.etcd.io/etcd/clientv3"
"github.com/chrislusf/seaweedfs/weed/filer"
"github.com/chrislusf/seaweedfs/weed/glog"
"github.com/chrislusf/seaweedfs/weed/pb/filer_pb"
weed_util "github.com/chrislusf/seaweedfs/weed/util"
)
const (
DIR_FILE_SEPARATOR = byte(0x00)
)
func init() {
filer.Stores = append(filer.Stores, &EtcdStore{})
}
type EtcdStore struct {
client *clientv3.Client
}
func (store *EtcdStore) GetName() string {
return "etcd"
}
func (store *EtcdStore) Initialize(configuration weed_util.Configuration, prefix string) (err error) {
servers := configuration.GetString(prefix + "servers")
if servers == "" {
servers = "localhost:2379"
}
timeout := configuration.GetString(prefix + "timeout")
if timeout == "" {
timeout = "3s"
}
return store.initialize(servers, timeout)
}
func (store *EtcdStore) initialize(servers string, timeout string) (err error) {
glog.Infof("filer store etcd: %s", servers)
to, err := time.ParseDuration(timeout)
if err != nil {
return fmt.Errorf("parse timeout %s: %s", timeout, err)
}
store.client, err = clientv3.New(clientv3.Config{
Endpoints: strings.Split(servers, ","),
DialTimeout: to,
})
if err != nil {
return fmt.Errorf("connect to etcd %s: %s", servers, err)
}
return
}
func (store *EtcdStore) BeginTransaction(ctx context.Context) (context.Context, error) {
return ctx, nil
}
func (store *EtcdStore) CommitTransaction(ctx context.Context) error {
return nil
}
func (store *EtcdStore) RollbackTransaction(ctx context.Context) error {
return nil
}
func (store *EtcdStore) InsertEntry(ctx context.Context, entry *filer.Entry) (err error) {
key := genKey(entry.DirAndName())
meta, err := entry.EncodeAttributesAndChunks()
if err != nil {
return fmt.Errorf("encoding %s %+v: %v", entry.FullPath, entry.Attr, err)
}
if len(entry.Chunks) > 50 {
meta = weed_util.MaybeGzipData(meta)
}
if _, err := store.client.Put(ctx, string(key), string(meta)); err != nil {
return fmt.Errorf("persisting %s : %v", entry.FullPath, err)
}
return nil
}
func (store *EtcdStore) UpdateEntry(ctx context.Context, entry *filer.Entry) (err error) {
return store.InsertEntry(ctx, entry)
}
func (store *EtcdStore) FindEntry(ctx context.Context, fullpath weed_util.FullPath) (entry *filer.Entry, err error) {
key := genKey(fullpath.DirAndName())
resp, err := store.client.Get(ctx, string(key))
if err != nil {
return nil, fmt.Errorf("get %s : %v", fullpath, err)
}
if len(resp.Kvs) == 0 {
return nil, filer_pb.ErrNotFound
}
entry = &filer.Entry{
FullPath: fullpath,
}
err = entry.DecodeAttributesAndChunks(weed_util.MaybeDecompressData(resp.Kvs[0].Value))
if err != nil {
return entry, fmt.Errorf("decode %s : %v", entry.FullPath, err)
}
return entry, nil
}
func (store *EtcdStore) DeleteEntry(ctx context.Context, fullpath weed_util.FullPath) (err error) {
key := genKey(fullpath.DirAndName())
if _, err := store.client.Delete(ctx, string(key)); err != nil {
return fmt.Errorf("delete %s : %v", fullpath, err)
}
return nil
}
func (store *EtcdStore) DeleteFolderChildren(ctx context.Context, fullpath weed_util.FullPath) (err error) {
directoryPrefix := genDirectoryKeyPrefix(fullpath, "")
if _, err := store.client.Delete(ctx, string(directoryPrefix), clientv3.WithPrefix()); err != nil {
return fmt.Errorf("deleteFolderChildren %s : %v", fullpath, err)
}
return nil
}
func (store *EtcdStore) ListDirectoryPrefixedEntries(ctx context.Context, dirPath weed_util.FullPath, startFileName string, includeStartFile bool, limit int64, prefix string) (entries []*filer.Entry, hasMore bool, err error) {
return nil, false, filer.ErrUnsupportedListDirectoryPrefixed
}
func (store *EtcdStore) ListDirectoryEntries(ctx context.Context, dirPath weed_util.FullPath, startFileName string, includeStartFile bool, limit int64) (entries []*filer.Entry, hasMore bool, err error) {
directoryPrefix := genDirectoryKeyPrefix(dirPath, "")
resp, err := store.client.Get(ctx, string(directoryPrefix),
clientv3.WithPrefix(), clientv3.WithSort(clientv3.SortByKey, clientv3.SortDescend))
if err != nil {
return nil, false, fmt.Errorf("list %s : %v", dirPath, err)
}
for _, kv := range resp.Kvs {
fileName := getNameFromKey(kv.Key)
if fileName == "" {
continue
}
if fileName == startFileName && !includeStartFile {
continue
}
limit--
if limit < 0 {
hasMore = true
break
}
entry := &filer.Entry{
FullPath: weed_util.NewFullPath(string(dirPath), fileName),
}
if decodeErr := entry.DecodeAttributesAndChunks(weed_util.MaybeDecompressData(kv.Value)); decodeErr != nil {
err = decodeErr
glog.V(0).Infof("list %s : %v", entry.FullPath, err)
break
}
entries = append(entries, entry)
}
return entries, hasMore, err
}
func genKey(dirPath, fileName string) (key []byte) {
key = []byte(dirPath)
key = append(key, DIR_FILE_SEPARATOR)
key = append(key, []byte(fileName)...)
return key
}
func genDirectoryKeyPrefix(fullpath weed_util.FullPath, startFileName string) (keyPrefix []byte) {
keyPrefix = []byte(string(fullpath))
keyPrefix = append(keyPrefix, DIR_FILE_SEPARATOR)
if len(startFileName) > 0 {
keyPrefix = append(keyPrefix, []byte(startFileName)...)
}
return keyPrefix
}
func getNameFromKey(key []byte) string {
sepIndex := len(key) - 1
for sepIndex >= 0 && key[sepIndex] != DIR_FILE_SEPARATOR {
sepIndex--
}
return string(key[sepIndex+1:])
}
func (store *EtcdStore) Shutdown() {
store.client.Close()
}
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