package etcd import ( "bytes" "context" "fmt" "strings" "time" "go.etcd.io/etcd/client/v3" "github.com/seaweedfs/seaweedfs/weed/filer" "github.com/seaweedfs/seaweedfs/weed/glog" "github.com/seaweedfs/seaweedfs/weed/pb/filer_pb" weed_util "github.com/seaweedfs/seaweedfs/weed/util" ) const ( DIR_FILE_SEPARATOR = byte(0x00) ) func init() { filer.Stores = append(filer.Stores, &EtcdStore{}) } type EtcdStore struct { client *clientv3.Client etcdKeyPrefix string } 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" } username := configuration.GetString(prefix + "username") password := configuration.GetString(prefix + "password") store.etcdKeyPrefix = configuration.GetString(prefix + "key_prefix") timeout := configuration.GetString(prefix + "timeout") if timeout == "" { timeout = "3s" } return store.initialize(servers, username, password, timeout) } func (store *EtcdStore) initialize(servers string, username string, password 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, ","), Username: username, Password: password, 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.GetChunks()) > filer.CountEntryChunksForGzip { meta = weed_util.MaybeGzipData(meta) } if _, err := store.client.Put(ctx, store.etcdKeyPrefix + 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, store.etcdKeyPrefix + 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, store.etcdKeyPrefix + 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, store.etcdKeyPrefix + 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, eachEntryFunc filer.ListEachEntryFunc) (lastFileName string, err error) { return lastFileName, filer.ErrUnsupportedListDirectoryPrefixed } func (store *EtcdStore) ListDirectoryEntries(ctx context.Context, dirPath weed_util.FullPath, startFileName string, includeStartFile bool, limit int64, eachEntryFunc filer.ListEachEntryFunc) (lastFileName string, err error) { directoryPrefix := genDirectoryKeyPrefix(dirPath, "") lastFileStart := directoryPrefix if startFileName != "" { lastFileStart = genDirectoryKeyPrefix(dirPath, startFileName) } resp, err := store.client.Get(ctx, store.etcdKeyPrefix + string(lastFileStart), clientv3.WithFromKey(), clientv3.WithLimit(limit+1)) if err != nil { return lastFileName, fmt.Errorf("list %s : %v", dirPath, err) } for _, kv := range resp.Kvs { if !bytes.HasPrefix(kv.Key, directoryPrefix) { break } fileName := getNameFromKey(kv.Key) if fileName == "" { continue } if fileName == startFileName && !includeStartFile { continue } limit-- if limit < 0 { 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 } if !eachEntryFunc(entry) { break } lastFileName = fileName } return lastFileName, 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() }