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package redis3
import (
"context"
"fmt"
"github.com/chrislusf/seaweedfs/weed/glog"
"github.com/chrislusf/seaweedfs/weed/util/skiplist"
"github.com/go-redis/redis/v8"
"github.com/golang/protobuf/proto"
)
type SkipListElementStore struct {
Prefix string
client redis.UniversalClient
}
var _ = skiplist.ListStore(&SkipListElementStore{})
func newSkipListElementStore(prefix string, client redis.UniversalClient) *SkipListElementStore {
return &SkipListElementStore{
Prefix: prefix,
client: client,
}
}
func (m *SkipListElementStore) SaveElement(id int64, element *skiplist.SkipListElement) error {
key := fmt.Sprintf("%s%d", m.Prefix, id)
data, err := proto.Marshal(element)
if err != nil {
glog.Errorf("marshal %s: %v", key, err)
}
return m.client.Set(context.Background(), key, data, 0).Err()
}
func (m *SkipListElementStore) DeleteElement(id int64) error {
key := fmt.Sprintf("%s%d", m.Prefix, id)
return m.client.Del(context.Background(), key).Err()
}
func (m *SkipListElementStore) LoadElement(id int64) (*skiplist.SkipListElement, error) {
key := fmt.Sprintf("%s%d", m.Prefix, id)
data, err := m.client.Get(context.Background(), key).Result()
if err != nil {
if err == redis.Nil {
return nil, nil
}
return nil, err
}
t := &skiplist.SkipListElement{}
err = proto.Unmarshal([]byte(data), t)
if err == nil {
for i := 0; i < len(t.Next); i++ {
if t.Next[i].IsNil() {
t.Next[i] = nil
}
}
if t.Prev.IsNil() {
t.Prev = nil
}
}
return t, err
}
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