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ldb.go
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ldb.go
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package vault
import (
"os"
"github.com/pkg/errors"
"github.com/syndtr/goleveldb/leveldb"
ldbutil "github.com/syndtr/goleveldb/leveldb/util"
)
var _ Store = &DB{}
// DB Store.
type DB struct {
ldb *leveldb.DB
path string
}
// NewDB creates DB Store.
func NewDB(path string) *DB {
return &DB{
path: path,
}
}
// Name for Store.
func (d *DB) Name() string {
return "vdb"
}
// Open db.
func (d *DB) Open() error {
if d.ldb != nil {
return ErrAlreadyOpen
}
if d.path == "" || d.path == "/" || d.path == `\` {
return errors.Errorf("invalid path")
}
logger.Infof("Open %s", d.path)
ldb, err := leveldb.OpenFile(d.path, nil)
if err != nil {
return err
}
d.ldb = ldb
return nil
}
// Close db.
func (d *DB) Close() error {
if d.ldb != nil {
if err := d.ldb.Close(); err != nil {
return err
}
d.ldb = nil
}
return nil
}
// Reset db.
func (d *DB) Reset() error {
wasOpen := false
if d.ldb != nil {
wasOpen = true
if err := d.Close(); err != nil {
return err
}
}
if err := os.RemoveAll(d.path); err != nil {
return err
}
if wasOpen {
if err := d.Open(); err != nil {
return err
}
}
return nil
}
// Set in DB.
func (d *DB) Set(path string, b []byte) error {
if d.ldb == nil {
return ErrNotOpen
}
if err := d.ldb.Put([]byte(path), b, nil); err != nil {
return err
}
return nil
}
// Get from DB.
func (d *DB) Get(path string) ([]byte, error) {
if d.ldb == nil {
return nil, ErrNotOpen
}
b, err := d.ldb.Get([]byte(path), nil)
if err != nil {
if err == leveldb.ErrNotFound {
return nil, nil
}
return nil, err
}
return b, nil
}
// Delete from DB.
func (d *DB) Delete(path string) (bool, error) {
if d.ldb == nil {
return false, ErrNotOpen
}
exists, err := d.ldb.Has([]byte(path), nil)
if err != nil {
return false, err
}
if !exists {
return false, nil
}
if err := d.ldb.Delete([]byte(path), nil); err != nil {
return false, err
}
return true, nil
}
// List ...
func (d *DB) List(opts *ListOptions) ([]*Entry, error) {
if d.ldb == nil {
return nil, ErrNotOpen
}
if opts == nil {
opts = &ListOptions{}
}
prefix := opts.Prefix
iter := d.ldb.NewIterator(ldbutil.BytesPrefix([]byte(prefix)), nil)
defer iter.Release()
out := []*Entry{}
for iter.Next() {
if opts.Limit > 0 && len(out) >= opts.Limit {
break
}
path := string(iter.Key())
entry := &Entry{Path: path}
if !opts.NoData {
// Remember that the contents of the returned slice should not be modified, and
// only valid until the next call to Next.
b := copyBytes(iter.Value())
entry.Data = b
}
out = append(out, entry)
}
if err := iter.Error(); err != nil {
return nil, err
}
return out, nil
}
func copyBytes(source []byte) []byte {
dest := make([]byte, len(source))
copy(dest, source)
return dest
}
// Exists if path exists.
func (d *DB) Exists(path string) (bool, error) {
if d.ldb == nil {
return false, ErrNotOpen
}
return d.ldb.Has([]byte(path), nil)
}