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package redis
import (
"context"
"fmt"
"golang.org/x/exp/slices"
"strings"
"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 UniversalRedisStore struct {
Client redis.UniversalClient
}
func (store *UniversalRedisStore) BeginTransaction(ctx context.Context) (context.Context, error) {
return ctx, nil
}
func (store *UniversalRedisStore) CommitTransaction(ctx context.Context) error {
return nil
}
func (store *UniversalRedisStore) RollbackTransaction(ctx context.Context) error {
return nil
}
func (store *UniversalRedisStore) 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) > filer.CountEntryChunksForGzip {
value = util.MaybeGzipData(value)
}
_, err = store.Client.Set(ctx, string(entry.FullPath), value, time.Duration(entry.TtlSec)*time.Second).Result()
if err != nil {
return fmt.Errorf("persisting %s : %v", entry.FullPath, err)
}
dir, name := entry.FullPath.DirAndName()
if name != "" {
_, err = store.Client.SAdd(ctx, genDirectoryListKey(dir), name).Result()
if err != nil {
return fmt.Errorf("persisting %s in parent dir: %v", entry.FullPath, err)
}
}
return nil
}
func (store *UniversalRedisStore) UpdateEntry(ctx context.Context, entry *filer.Entry) (err error) {
return store.InsertEntry(ctx, entry)
}
func (store *UniversalRedisStore) 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 *UniversalRedisStore) DeleteEntry(ctx context.Context, fullpath util.FullPath) (err error) {
_, 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 != "" {
_, err = store.Client.SRem(ctx, genDirectoryListKey(dir), name).Result()
if err != nil {
return fmt.Errorf("delete %s in parent dir: %v", fullpath, err)
}
}
return nil
}
func (store *UniversalRedisStore) DeleteFolderChildren(ctx context.Context, fullpath util.FullPath) (err error) {
members, err := store.Client.SMembers(ctx, genDirectoryListKey(string(fullpath))).Result()
if err != nil {
return fmt.Errorf("delete folder %s : %v", fullpath, err)
}
for _, fileName := range members {
path := util.NewFullPath(string(fullpath), fileName)
_, err = store.Client.Del(ctx, string(path)).Result()
if err != nil {
return fmt.Errorf("delete %s in parent dir: %v", fullpath, err)
}
// not efficient, but need to remove if it is a directory
store.Client.Del(ctx, genDirectoryListKey(string(path)))
}
return nil
}
func (store *UniversalRedisStore) 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 *UniversalRedisStore) ListDirectoryEntries(ctx context.Context, dirPath util.FullPath, startFileName string, includeStartFile bool, limit int64, eachEntryFunc filer.ListEachEntryFunc) (lastFileName string, err error) {
dirListKey := genDirectoryListKey(string(dirPath))
members, err := store.Client.SMembers(ctx, dirListKey).Result()
if err != nil {
return lastFileName, fmt.Errorf("list %s : %v", dirPath, err)
}
// skip
if startFileName != "" {
var t []string
for _, m := range members {
if strings.Compare(m, startFileName) >= 0 {
if m == startFileName {
if includeStartFile {
t = append(t, m)
}
} else {
t = append(t, m)
}
}
}
members = t
}
// sort
slices.SortFunc(members, func(a, b string) bool {
return strings.Compare(a, b) < 0
})
// limit
if limit < int64(len(members)) {
members = members[:limit]
}
// 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.SRem(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 *UniversalRedisStore) Shutdown() {
store.Client.Close()
}
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