/
leveldb_store.go
123 lines (105 loc) · 2.31 KB
/
leveldb_store.go
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
package raftleveldb
import (
"github.com/hashicorp/raft"
"github.com/syndtr/goleveldb/leveldb"
"github.com/syndtr/goleveldb/leveldb/util"
)
type Store struct {
db *leveldb.DB
}
func NewStore(dir string) (*Store, error) {
db, err := leveldb.OpenFile(dir, nil)
if err != nil {
return nil, err
}
return &Store{
db: db,
}, nil
}
func (s *Store) Close() error {
return s.db.Close()
}
func (s *Store) FirstIndex() (uint64, error) {
iter := s.db.NewIterator(nil, nil)
defer iter.Release()
ok := iter.First()
if !ok {
return 0, nil
}
return bytesToUint64(iter.Key()), nil
}
func (s *Store) LastIndex() (uint64, error) {
iter := s.db.NewIterator(nil, nil)
defer iter.Release()
ok := iter.Last()
if !ok {
return 0, nil
}
return bytesToUint64(iter.Key()), nil
}
func (s *Store) GetLog(index uint64, log *raft.Log) error {
key := uint64ToBytes(index)
v, err := s.db.Get(key, nil)
if err == leveldb.ErrNotFound {
return raft.ErrLogNotFound
} else if err != nil {
return err
}
return decodeMsgPack(v, log)
}
func (s *Store) StoreLog(log *raft.Log) error {
return s.StoreLogs([]*raft.Log{log})
}
func (s *Store) StoreLogs(logs []*raft.Log) error {
batch := new(leveldb.Batch)
for _, log := range logs {
key := uint64ToBytes(log.Index)
val, err := encodeMsgPack(log)
if err != nil {
return err
}
batch.Put(key, val.Bytes())
}
return s.db.Write(batch, nil)
}
func (s *Store) DeleteRange(min, max uint64) error {
Range := util.Range{
Start: uint64ToBytes(min),
Limit: uint64ToBytes(max),
}
batch := new(leveldb.Batch)
iter := s.db.NewIterator(&Range, nil)
defer iter.Release()
for iter.Next() {
batch.Delete(iter.Key())
}
// leveldb的range不包含Limit
batch.Delete(uint64ToBytes(max))
return s.db.Write(batch, nil)
}
func (s *Store) Set(key []byte, val []byte) error {
return s.db.Put(key, val, nil)
}
func (s *Store) Get(key []byte) ([]byte, error) {
v, err := s.db.Get(key, nil)
if err == leveldb.ErrNotFound {
return make([]byte, 0), nil
}
if err != nil {
return nil, err
}
return v, nil
}
func (s *Store) SetUint64(key []byte, val uint64) error {
return s.Set(key, uint64ToBytes(val))
}
func (s *Store) GetUint64(key []byte) (uint64, error) {
val, err := s.Get(key)
if err != nil {
return 0, err
}
if len(val) == 0 {
return 0, nil
}
return bytesToUint64(val), nil
}