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package redis
import (
"fmt"
"github.com/chrislusf/seaweedfs/weed/filer2"
"github.com/chrislusf/seaweedfs/weed/glog"
"github.com/go-redis/redis"
"sort"
"strings"
)
const (
DIR_LIST_MARKER = "\x00"
)
func init() {
filer2.Stores = append(filer2.Stores, &RedisStore{})
}
type RedisStore struct {
Client *redis.Client
}
func (store *RedisStore) GetName() string {
return "redis"
}
func (store *RedisStore) Initialize(configuration filer2.Configuration) (err error) {
return store.initialize(
configuration.GetString("address"),
configuration.GetString("password"),
configuration.GetInt("database"),
)
}
func (store *RedisStore) initialize(hostPort string, password string, database int) (err error) {
store.Client = redis.NewClient(&redis.Options{
Addr: hostPort,
Password: password,
DB: database,
})
return
}
func (store *RedisStore) InsertEntry(entry *filer2.Entry) (err error) {
value, err := entry.EncodeAttributesAndChunks()
if err != nil {
return fmt.Errorf("encoding %s %+v: %v", entry.FullPath, entry.Attr, err)
}
_, err = store.Client.Set(string(entry.FullPath), value, 0).Result()
if err != nil {
return fmt.Errorf("persisting %s : %v", entry.FullPath, err)
}
dir, name := entry.FullPath.DirAndName()
if name != "" {
_, err = store.Client.SAdd(genDirectoryListKey(dir), name).Result()
if err != nil {
return fmt.Errorf("persisting %s in parent dir: %v", entry.FullPath, err)
}
}
return nil
}
func (store *RedisStore) UpdateEntry(entry *filer2.Entry) (err error) {
return store.InsertEntry(entry)
}
func (store *RedisStore) FindEntry(fullpath filer2.FullPath) (entry *filer2.Entry, err error) {
data, err := store.Client.Get(string(fullpath)).Result()
if err == redis.Nil {
return nil, filer2.ErrNotFound
}
if err != nil {
return nil, fmt.Errorf("get %s : %v", entry.FullPath, err)
}
entry = &filer2.Entry{
FullPath: fullpath,
}
err = entry.DecodeAttributesAndChunks([]byte(data))
if err != nil {
return entry, fmt.Errorf("decode %s : %v", entry.FullPath, err)
}
return entry, nil
}
func (store *RedisStore) DeleteEntry(fullpath filer2.FullPath) (err error) {
_, err = store.Client.Del(string(fullpath)).Result()
if err != nil {
return fmt.Errorf("delete %s : %v", fullpath, err)
}
dir, name := fullpath.DirAndName()
if name != "" {
_, err = store.Client.SRem(genDirectoryListKey(dir), name).Result()
if err != nil {
return fmt.Errorf("delete %s in parent dir: %v", fullpath, err)
}
}
return nil
}
func (store *RedisStore) ListDirectoryEntries(fullpath filer2.FullPath, startFileName string, inclusive bool,
limit int) (entries []*filer2.Entry, err error) {
members, err := store.Client.SMembers(genDirectoryListKey(string(fullpath))).Result()
if err != nil {
return nil, fmt.Errorf("list %s : %v", fullpath, err)
}
// skip
if startFileName != "" {
var t []string
for _, m := range members {
if strings.Compare(m, startFileName) >= 0 {
if m == startFileName {
if inclusive {
t = append(t, m)
}
} else {
t = append(t, m)
}
}
}
members = t
}
// sort
sort.Slice(members, func(i, j int) bool {
return strings.Compare(members[i], members[j]) < 0
})
// limit
if limit < len(members) {
members = members[:limit]
}
// fetch entry meta
for _, fileName := range members {
path := filer2.NewFullPath(string(fullpath), fileName)
entry, err := store.FindEntry(path)
if err != nil {
glog.V(0).Infof("list %s : %v", path, err)
} else {
entries = append(entries, entry)
}
}
return entries, err
}
func genDirectoryListKey(dir string) (dirList string) {
return dir + DIR_LIST_MARKER
}
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