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attribute.go
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attribute.go
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/*
* Copyright (C) 2018 The DNA Authors
* This file is part of The DNA library.
*
* The DNA is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* The DNA is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with The DNA. If not, see <http://www.gnu.org/licenses/>.
*/
package ontid
import (
"bytes"
"errors"
"fmt"
"io"
"github.com/dnaproject2/DNA/common/serialization"
"github.com/dnaproject2/DNA/smartcontract/service/native"
"github.com/dnaproject2/DNA/smartcontract/service/native/utils"
)
type attribute struct {
key []byte
value []byte
valueType []byte
}
func (this *attribute) Value() ([]byte, error) {
var buf bytes.Buffer
err := serialization.WriteVarBytes(&buf, this.value)
if err != nil {
return nil, err
}
err = serialization.WriteVarBytes(&buf, this.valueType)
if err != nil {
return nil, err
}
return buf.Bytes(), nil
}
func (this *attribute) SetValue(data []byte) error {
buf := bytes.NewBuffer(data)
val, err := serialization.ReadVarBytes(buf)
if err != nil {
return err
}
vt, err := serialization.ReadVarBytes(buf)
if err != nil {
return err
}
this.valueType = vt
this.value = val
return nil
}
func (this *attribute) Serialize(w io.Writer) error {
err := serialization.WriteVarBytes(w, this.key)
if err != nil {
return err
}
err = serialization.WriteVarBytes(w, this.valueType)
if err != nil {
return err
}
err = serialization.WriteVarBytes(w, this.value)
if err != nil {
return err
}
return nil
}
func (this *attribute) Deserialize(r io.Reader) error {
k, err := serialization.ReadVarBytes(r)
if err != nil {
return err
}
vt, err := serialization.ReadVarBytes(r)
if err != nil {
return err
}
v, err := serialization.ReadVarBytes(r)
if err != nil {
return err
}
this.key = k
this.value = v
this.valueType = vt
return nil
}
func insertOrUpdateAttr(srvc *native.NativeService, encID []byte, attr *attribute) error {
key := append(encID, FIELD_ATTR)
val, err := attr.Value()
if err != nil {
return errors.New("serialize attribute value error: " + err.Error())
}
err = utils.LinkedlistInsert(srvc, key, attr.key, val)
if err != nil {
return errors.New("store attribute error: " + err.Error())
}
return nil
}
func findAttr(srvc *native.NativeService, encID, item []byte) (*utils.LinkedlistNode, error) {
key := append(encID, FIELD_ATTR)
return utils.LinkedlistGetItem(srvc, key, item)
}
func batchInsertAttr(srvc *native.NativeService, encID []byte, attr []attribute) error {
res := make([][]byte, len(attr))
for i, v := range attr {
err := insertOrUpdateAttr(srvc, encID, &v)
if err != nil {
return errors.New("store attributes error: " + err.Error())
}
res[i] = v.key
}
return nil
}
func getAllAttr(srvc *native.NativeService, encID []byte) ([]byte, error) {
key := append(encID, FIELD_ATTR)
item, err := utils.LinkedlistGetHead(srvc, key)
if err != nil {
return nil, fmt.Errorf("get list head error, %s", err)
} else if len(item) == 0 {
// not exists
return nil, nil
}
var res bytes.Buffer
var i uint16 = 0
for len(item) > 0 {
node, err := utils.LinkedlistGetItem(srvc, key, item)
if err != nil {
return nil, fmt.Errorf("get storage item error, %s", err)
} else if node == nil {
return nil, fmt.Errorf("storage item not exists, %v", item)
}
var attr attribute
err = attr.SetValue(node.GetPayload())
if err != nil {
return nil, fmt.Errorf("parse attribute failed, %s", err)
}
attr.key = item
err = attr.Serialize(&res)
if err != nil {
return nil, fmt.Errorf("serialize error, %s", err)
}
i += 1
item = node.GetNext()
}
return res.Bytes(), nil
}