/
database.go
109 lines (84 loc) · 1.84 KB
/
database.go
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//<developer>
// <name>linapex 曹一峰</name>
// <email>linapex@163.com</email>
// <wx>superexc</wx>
// <qqgroup>128148617</qqgroup>
// <url>https://jsq.ink</url>
// <role>pku engineer</role>
// <date>2019-03-16 12:09:49</date>
//</624342680679223296>
//
//
//
//
//
//
//
//
//
//
//
//
//
//
//
package storage
//
//
import (
"fmt"
"github.com/ethereum/go-ethereum/metrics"
"github.com/syndtr/goleveldb/leveldb"
"github.com/syndtr/goleveldb/leveldb/iterator"
"github.com/syndtr/goleveldb/leveldb/opt"
)
const openFileLimit = 128
type LDBDatabase struct {
db *leveldb.DB
}
func NewLDBDatabase(file string) (*LDBDatabase, error) {
//
db, err := leveldb.OpenFile(file, &opt.Options{OpenFilesCacheCapacity: openFileLimit})
if err != nil {
return nil, err
}
database := &LDBDatabase{db: db}
return database, nil
}
func (db *LDBDatabase) Put(key []byte, value []byte) {
metrics.GetOrRegisterCounter("ldbdatabase.put", nil).Inc(1)
err := db.db.Put(key, value, nil)
if err != nil {
fmt.Println("Error put", err)
}
}
func (db *LDBDatabase) Get(key []byte) ([]byte, error) {
metrics.GetOrRegisterCounter("ldbdatabase.get", nil).Inc(1)
dat, err := db.db.Get(key, nil)
if err != nil {
return nil, err
}
return dat, nil
}
func (db *LDBDatabase) Delete(key []byte) error {
return db.db.Delete(key, nil)
}
func (db *LDBDatabase) LastKnownTD() []byte {
data, _ := db.Get([]byte("LTD"))
if len(data) == 0 {
data = []byte{0x0}
}
return data
}
func (db *LDBDatabase) NewIterator() iterator.Iterator {
metrics.GetOrRegisterCounter("ldbdatabase.newiterator", nil).Inc(1)
return db.db.NewIterator(nil, nil)
}
func (db *LDBDatabase) Write(batch *leveldb.Batch) error {
metrics.GetOrRegisterCounter("ldbdatabase.write", nil).Inc(1)
return db.db.Write(batch, nil)
}
func (db *LDBDatabase) Close() {
//
db.db.Close()
}