wip

weed/filer/redis3/universal_redis_store.go

@@ -0,0 +1,175 @@
+package redis3
+
+import (
+	"context"
+	"fmt"
+	"time"
+
+	"github.com/go-redis/redis/v8"
+
+	"github.com/chrislusf/seaweedfs/weed/filer"
+	"github.com/chrislusf/seaweedfs/weed/glog"
+	"github.com/chrislusf/seaweedfs/weed/pb/filer_pb"
+	"github.com/chrislusf/seaweedfs/weed/util"
+)
+
+const (
+	DIR_LIST_MARKER = "\x00"
+)
+
+type UniversalRedis3Store struct {
+	Client                  redis.UniversalClient
+}
+
+func (store *UniversalRedis3Store) BeginTransaction(ctx context.Context) (context.Context, error) {
+	return ctx, nil
+}
+func (store *UniversalRedis3Store) CommitTransaction(ctx context.Context) error {
+	return nil
+}
+func (store *UniversalRedis3Store) RollbackTransaction(ctx context.Context) error {
+	return nil
+}
+
+func (store *UniversalRedis3Store) InsertEntry(ctx context.Context, entry *filer.Entry) (err error) {
+
+	value, err := entry.EncodeAttributesAndChunks()
+	if err != nil {
+		return fmt.Errorf("encoding %s %+v: %v", entry.FullPath, entry.Attr, err)
+	}
+
+	if len(entry.Chunks) > 50 {
+		value = util.MaybeGzipData(value)
+	}
+
+	if err = store.Client.Set(ctx, string(entry.FullPath), value, time.Duration(entry.TtlSec)*time.Second).Err(); err != nil {
+		return fmt.Errorf("persisting %s : %v", entry.FullPath, err)
+	}
+
+	dir, name := entry.FullPath.DirAndName()
+
+	if name != "" {
+		if err = insertChild(ctx, store.Client, genDirectoryListKey(dir), name); err != nil {
+			return fmt.Errorf("persisting %s in parent dir: %v", entry.FullPath, err)
+		}
+	}
+
+	return nil
+}
+
+func (store *UniversalRedis3Store) UpdateEntry(ctx context.Context, entry *filer.Entry) (err error) {
+
+	return store.InsertEntry(ctx, entry)
+}
+
+func (store *UniversalRedis3Store) FindEntry(ctx context.Context, fullpath util.FullPath) (entry *filer.Entry, err error) {
+
+	data, err := store.Client.Get(ctx, string(fullpath)).Result()
+	if err == redis.Nil {
+		return nil, filer_pb.ErrNotFound
+	}
+
+	if err != nil {
+		return nil, fmt.Errorf("get %s : %v", fullpath, err)
+	}
+
+	entry = &filer.Entry{
+		FullPath: fullpath,
+	}
+	err = entry.DecodeAttributesAndChunks(util.MaybeDecompressData([]byte(data)))
+	if err != nil {
+		return entry, fmt.Errorf("decode %s : %v", entry.FullPath, err)
+	}
+
+	return entry, nil
+}
+
+func (store *UniversalRedis3Store) DeleteEntry(ctx context.Context, fullpath util.FullPath) (err error) {
+
+	_, err = store.Client.Del(ctx, genDirectoryListKey(string(fullpath))).Result()
+	if err != nil {
+		return fmt.Errorf("delete dir list %s : %v", fullpath, err)
+	}
+
+	_, err = store.Client.Del(ctx, string(fullpath)).Result()
+	if err != nil {
+		return fmt.Errorf("delete %s : %v", fullpath, err)
+	}
+
+	dir, name := fullpath.DirAndName()
+
+	if name != "" {
+		if err = removeChild(ctx, store.Client, genDirectoryListKey(dir), name); err != nil {
+			return fmt.Errorf("DeleteEntry %s in parent dir: %v", fullpath, err)
+		}
+	}
+
+	return nil
+}
+
+func (store *UniversalRedis3Store) DeleteFolderChildren(ctx context.Context, fullpath util.FullPath) (err error) {
+
+	return removeChildren(ctx, store.Client, genDirectoryListKey(string(fullpath)), func(name string) error {
+		path := util.NewFullPath(string(fullpath), name)
+		_, err = store.Client.Del(ctx, string(path)).Result()
+		if err != nil {
+			return fmt.Errorf("DeleteFolderChildren %s in parent dir: %v", fullpath, err)
+		}
+		return nil
+	})
+
+}
+
+func (store *UniversalRedis3Store) ListDirectoryPrefixedEntries(ctx context.Context, dirPath util.FullPath, startFileName string, includeStartFile bool, limit int64, prefix string, eachEntryFunc filer.ListEachEntryFunc) (lastFileName string, err error) {
+	return lastFileName, filer.ErrUnsupportedListDirectoryPrefixed
+}
+
+func (store *UniversalRedis3Store) ListDirectoryEntries(ctx context.Context, dirPath util.FullPath, startFileName string, includeStartFile bool, limit int64, eachEntryFunc filer.ListEachEntryFunc) (lastFileName string, err error) {
+
+	dirListKey := genDirectoryListKey(string(dirPath))
+	start := int64(0)
+	if startFileName != "" {
+		start, _ = store.Client.ZRank(ctx, dirListKey, startFileName).Result()
+		if !includeStartFile {
+			start++
+		}
+	}
+	members, err := store.Client.ZRange(ctx, dirListKey, start, start+int64(limit)-1).Result()
+	if err != nil {
+		return lastFileName, fmt.Errorf("list %s : %v", dirPath, err)
+	}
+
+	// fetch entry meta
+	for _, fileName := range members {
+		path := util.NewFullPath(string(dirPath), fileName)
+		entry, err := store.FindEntry(ctx, path)
+		lastFileName = fileName
+		if err != nil {
+			glog.V(0).Infof("list %s : %v", path, err)
+			if err == filer_pb.ErrNotFound {
+				continue
+			}
+		} else {
+			if entry.TtlSec > 0 {
+				if entry.Attr.Crtime.Add(time.Duration(entry.TtlSec) * time.Second).Before(time.Now()) {
+					store.Client.Del(ctx, string(path)).Result()
+					store.Client.ZRem(ctx, dirListKey, fileName).Result()
+					continue
+				}
+			}
+			if !eachEntryFunc(entry) {
+				break
+			}
+		}
+	}
+
+	return lastFileName, err
+}
+
+func genDirectoryListKey(dir string) (dirList string) {
+	return dir + DIR_LIST_MARKER
+}
+
+func (store *UniversalRedis3Store) Shutdown() {
+	store.Client.Close()
+}