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186 lines
4.5 KiB
186 lines
4.5 KiB
package etcd
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import (
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"context"
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"fmt"
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"strings"
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"time"
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"github.com/chrislusf/seaweedfs/weed/filer2"
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"github.com/chrislusf/seaweedfs/weed/glog"
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weed_util "github.com/chrislusf/seaweedfs/weed/util"
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"go.etcd.io/etcd/clientv3"
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)
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const (
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DIR_FILE_SEPARATOR = byte(0x00)
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)
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func init() {
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filer2.Stores = append(filer2.Stores, &EtcdStore{})
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}
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type EtcdStore struct {
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client *clientv3.Client
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}
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func (store *EtcdStore) GetName() string {
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return "etcd"
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}
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func (store *EtcdStore) Initialize(configuration weed_util.Configuration) (err error) {
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servers := configuration.GetString("servers")
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if servers == "" {
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servers = "localhost:2379"
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}
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timeout := configuration.GetString("timeout")
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if timeout == "" {
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timeout = "3s"
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}
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return store.initialize(servers, timeout)
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}
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func (store *EtcdStore) initialize(servers string, timeout string) (err error) {
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glog.Infof("filer store etcd: %s", servers)
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to, err := time.ParseDuration(timeout)
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if err != nil {
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return fmt.Errorf("parse timeout %s: %s", timeout, err)
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}
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store.client, err = clientv3.New(clientv3.Config{
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Endpoints: strings.Split(servers, ","),
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DialTimeout: to,
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})
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if err != nil {
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return fmt.Errorf("connect to etcd %s: %s", servers, err)
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}
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return
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}
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func (store *EtcdStore) BeginTransaction(ctx context.Context) (context.Context, error) {
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return ctx, nil
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}
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func (store *EtcdStore) CommitTransaction(ctx context.Context) error {
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return nil
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}
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func (store *EtcdStore) RollbackTransaction(ctx context.Context) error {
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return nil
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}
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func (store *EtcdStore) InsertEntry(ctx context.Context, entry *filer2.Entry) (err error) {
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key := genKey(entry.DirAndName())
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value, err := entry.EncodeAttributesAndChunks()
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if err != nil {
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return fmt.Errorf("encoding %s %+v: %v", entry.FullPath, entry.Attr, err)
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}
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if _, err := store.client.Put(ctx, string(key), string(value)); err != nil {
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return fmt.Errorf("persisting %s : %v", entry.FullPath, err)
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}
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return nil
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}
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func (store *EtcdStore) UpdateEntry(ctx context.Context, entry *filer2.Entry) (err error) {
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return store.InsertEntry(ctx, entry)
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}
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func (store *EtcdStore) FindEntry(ctx context.Context, fullpath filer2.FullPath) (entry *filer2.Entry, err error) {
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key := genKey(fullpath.DirAndName())
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resp, err := store.client.Get(ctx, string(key))
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if err != nil {
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return nil, fmt.Errorf("get %s : %v", entry.FullPath, err)
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}
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if len(resp.Kvs) == 0 {
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return nil, filer2.ErrNotFound
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}
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entry = &filer2.Entry{
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FullPath: fullpath,
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}
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err = entry.DecodeAttributesAndChunks(resp.Kvs[0].Value)
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if err != nil {
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return entry, fmt.Errorf("decode %s : %v", entry.FullPath, err)
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}
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return entry, nil
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}
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func (store *EtcdStore) DeleteEntry(ctx context.Context, fullpath filer2.FullPath) (err error) {
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key := genKey(fullpath.DirAndName())
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if _, err := store.client.Delete(ctx, string(key)); err != nil {
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return fmt.Errorf("delete %s : %v", fullpath, err)
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}
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return nil
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}
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func (store *EtcdStore) ListDirectoryEntries(
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ctx context.Context, fullpath filer2.FullPath, startFileName string, inclusive bool, limit int,
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) (entries []*filer2.Entry, err error) {
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directoryPrefix := genDirectoryKeyPrefix(fullpath, "")
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resp, err := store.client.Get(ctx, string(directoryPrefix),
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clientv3.WithPrefix(), clientv3.WithSort(clientv3.SortByKey, clientv3.SortDescend))
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if err != nil {
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return nil, fmt.Errorf("list %s : %v", fullpath, err)
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}
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for _, kv := range resp.Kvs {
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fileName := getNameFromKey(kv.Key)
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if fileName == "" {
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continue
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}
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if fileName == startFileName && !inclusive {
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continue
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}
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limit--
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if limit < 0 {
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break
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}
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entry := &filer2.Entry{
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FullPath: filer2.NewFullPath(string(fullpath), fileName),
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}
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if decodeErr := entry.DecodeAttributesAndChunks(kv.Value); decodeErr != nil {
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err = decodeErr
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glog.V(0).Infof("list %s : %v", entry.FullPath, err)
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break
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}
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entries = append(entries, entry)
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}
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return entries, err
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}
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func genKey(dirPath, fileName string) (key []byte) {
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key = []byte(dirPath)
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key = append(key, DIR_FILE_SEPARATOR)
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key = append(key, []byte(fileName)...)
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return key
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}
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func genDirectoryKeyPrefix(fullpath filer2.FullPath, startFileName string) (keyPrefix []byte) {
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keyPrefix = []byte(string(fullpath))
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keyPrefix = append(keyPrefix, DIR_FILE_SEPARATOR)
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if len(startFileName) > 0 {
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keyPrefix = append(keyPrefix, []byte(startFileName)...)
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}
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return keyPrefix
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}
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func getNameFromKey(key []byte) string {
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sepIndex := len(key) - 1
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for sepIndex >= 0 && key[sepIndex] != DIR_FILE_SEPARATOR {
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sepIndex--
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}
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return string(key[sepIndex+1:])
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}
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