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
|
package ethdb
import (
"fmt"
"github.com/ethereum/go-ethereum/compression/rle"
"github.com/ethereum/go-ethereum/ethutil"
"github.com/syndtr/goleveldb/leveldb"
"github.com/syndtr/goleveldb/leveldb/iterator"
)
type LDBDatabase struct {
db *leveldb.DB
comp bool
}
func NewLDBDatabase(file string) (*LDBDatabase, error) {
// Open the db
db, err := leveldb.OpenFile(file, nil)
if err != nil {
return nil, err
}
database := &LDBDatabase{db: db, comp: true}
return database, nil
}
func (self *LDBDatabase) Put(key []byte, value []byte) {
if self.comp {
value = rle.Compress(value)
}
err := self.db.Put(key, value, nil)
if err != nil {
fmt.Println("Error put", err)
}
}
func (self *LDBDatabase) Get(key []byte) ([]byte, error) {
dat, err := self.db.Get(key, nil)
if err != nil {
return nil, err
}
if self.comp {
return rle.Decompress(dat)
}
return dat, nil
}
func (self *LDBDatabase) Delete(key []byte) error {
return self.db.Delete(key, nil)
}
func (self *LDBDatabase) LastKnownTD() []byte {
data, _ := self.Get([]byte("LTD"))
if len(data) == 0 {
data = []byte{0x0}
}
return data
}
func (self *LDBDatabase) NewIterator() iterator.Iterator {
return self.db.NewIterator(nil, nil)
}
func (self *LDBDatabase) Write(batch *leveldb.Batch) error {
return self.db.Write(batch, nil)
}
func (self *LDBDatabase) Close() {
// Close the leveldb database
self.db.Close()
}
func (self *LDBDatabase) Print() {
iter := self.db.NewIterator(nil, nil)
for iter.Next() {
key := iter.Key()
value := iter.Value()
fmt.Printf("%x(%d): ", key, len(key))
node := ethutil.NewValueFromBytes(value)
fmt.Printf("%v\n", node)
}
}
|
