/
database.go
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/
database.go
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// Copyright 2017. box.la authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package localdb
import (
"github.com/boxproject/voucher/config"
verrors "github.com/boxproject/voucher/errors"
"github.com/syndtr/goleveldb/leveldb"
"github.com/syndtr/goleveldb/leveldb/errors"
"github.com/syndtr/goleveldb/leveldb/filter"
"github.com/syndtr/goleveldb/leveldb/opt"
"github.com/syndtr/goleveldb/leveldb/util"
logger "github.com/alecthomas/log4go"
)
type Database interface {
Put(key []byte, value []byte) error
Get(key []byte) ([]byte, error)
Has(key []byte) (bool, error)
Delete(key []byte) error
GetPrifix(keyPrefix []byte) (map[string]string, error)
Close() error
}
func NewLVDBDatabase(filePath string, cache int, openFiles int) (*leveldb.DB, error) {
if cache < 16 {
cache = 16
}
if openFiles < 16 {
openFiles = 16
}
db, err := leveldb.OpenFile(filePath, &opt.Options{
OpenFilesCacheCapacity: openFiles,
BlockCacheCapacity: cache / 2 * opt.MiB,
WriteBuffer: cache / 4 * opt.MiB,
Filter: filter.NewBloomFilter(10),
})
if _, corrupted := err.(*errors.ErrCorrupted); corrupted {
db, err = leveldb.RecoverFile(filePath, nil)
}
if err != nil {
return nil, err
}
return db, nil
}
func NewDatabase(cfg *config.DatabaseConfig) (Database, error) {
db, err := NewLVDBDatabase(cfg.Filepath, cfg.Cache, cfg.Openfiles)
if err != nil {
return nil, err
}
return &table{
db: db,
prefix: cfg.Prefix,
}, nil
}
type table struct {
db *leveldb.DB
prefix string
}
func (dt *table) Put(key []byte, value []byte) error {
return dt.db.Put(append([]byte(dt.prefix), key...), value, nil)
}
func (dt *table) Has(key []byte) (ret bool, err error) {
ret, err = dt.db.Has(append([]byte(dt.prefix), key...), nil)
if err != nil {
if err == leveldb.ErrNotFound {
return ret, verrors.NoDataErr
}
return
}
return ret, nil
}
func (dt *table) Get(key []byte) ([]byte, error) {
data, err := dt.db.Get(append([]byte(dt.prefix), key...), nil)
if err != nil {
if err == leveldb.ErrNotFound {
return nil, verrors.NoDataErr
}
return nil, err
}
return data, nil
}
//查询前缀 TODO iter 使用字节组赋值有问题
func (dt *table) GetPrifix(keyPrefix []byte) (map[string]string, error) {
var resMap map[string]string = make(map[string]string)
iter := dt.db.NewIterator(util.BytesPrefix(append([]byte(dt.prefix), keyPrefix...)), nil)
if iter.Error() == leveldb.ErrNotFound {
return nil, verrors.NoDataErr
}
if iter.Error() != nil {
logger.Error("get prifix error")
return nil, iter.Error()
}
for iter.Next() {
resMap[string(iter.Key())] = string(iter.Value())
}
iter.Release()
return resMap, nil
}
func (dt *table) Delete(key []byte) error {
err := dt.db.Delete(append([]byte(dt.prefix), key...), nil)
if err != nil {
if err == leveldb.ErrNotFound {
return verrors.NoDataErr
}
return err
}
return nil
}
func (dt *table) Close() error {
return dt.db.Close()
}