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db.go
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db.go
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/**
* Copyright (c) 2018, 2019 National Digital ID COMPANY LIMITED
*
* This file is part of NDID software.
*
* NDID is the free software: you can redistribute it and/or modify it under
* the terms of the Affero GNU General Public License as published by the
* Free Software Foundation, either version 3 of the License, or any later
* version.
*
* NDID 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 Affero GNU General Public License for more details.
*
* You should have received a copy of the Affero GNU General Public License
* along with the NDID source code. If not, see https://www.gnu.org/licenses/agpl.txt.
*
* Please contact info@ndid.co.th for any further questions
*
*/
package did
import (
"encoding/binary"
"strconv"
"github.com/golang/protobuf/proto"
"github.com/ndidplatform/smart-contract/abci/utils"
"github.com/ndidplatform/smart-contract/protos/data"
)
func (app *DIDApplication) SetStateDB(key, value []byte) {
app.HashData = append(app.HashData, key...)
app.HashData = append(app.HashData, value...)
app.UncommittedState[string(key)] = value
}
func (app *DIDApplication) SetVersionedStateDB(key, value []byte) {
versionsKeyStr := string(key) + "|versions"
versionsKey := []byte(versionsKeyStr)
var versions []int64
var existInUncommittedState bool
versions, existInUncommittedState = app.UncommittedVersionsState[versionsKeyStr]
if !existInUncommittedState {
keyVersionsProtobuf := app.state.db.Get(versionsKey)
if keyVersionsProtobuf != nil {
var keyVersions data.KeyVersions
err := proto.Unmarshal([]byte(keyVersionsProtobuf), &keyVersions)
if err != nil {
panic(err) // Should panic or return err?
}
versions = keyVersions.Versions
}
}
if len(versions) == 0 || versions[len(versions)-1] != app.CurrentBlock {
app.HashData = append(app.HashData, versionsKey...)
versionBytes := make([]byte, 8)
for _, version := range versions {
binary.BigEndian.PutUint64(versionBytes, uint64(version))
app.HashData = append(app.HashData, versionBytes...)
}
app.UncommittedVersionsState[versionsKeyStr] = append(versions, app.CurrentBlock)
}
keyWithVersionStr := string(key) + "|" + strconv.FormatInt(app.CurrentBlock, 10)
app.HashData = append(app.HashData, key...)
app.HashData = append(app.HashData, value...)
app.UncommittedState[keyWithVersionStr] = value
}
func (app *DIDApplication) GetStateDB(key []byte) (err error, value []byte) {
var existInUncommittedState bool
value, existInUncommittedState = app.UncommittedState[string(key)]
if !existInUncommittedState {
value = app.state.db.Get(key)
}
return nil, value
}
func (app *DIDApplication) GetVersionedStateDB(key []byte, height int64) (err error, value []byte) {
versionsKeyStr := string(key) + "|versions"
versionsKey := []byte(versionsKeyStr)
var versions []int64
var existInUncommittedState bool
versions, existInUncommittedState = app.UncommittedVersionsState[versionsKeyStr]
if !existInUncommittedState {
keyVersionsProtobuf := app.state.db.Get(versionsKey)
if keyVersionsProtobuf != nil {
var keyVersions data.KeyVersions
err = proto.Unmarshal([]byte(keyVersionsProtobuf), &keyVersions)
if err != nil {
return err, nil
}
versions = keyVersions.Versions
}
}
if len(versions) == 0 {
return nil, nil
}
var version int64
if height <= 0 {
version = versions[len(versions)-1]
} else {
for i := len(versions) - 1; i >= 0; i-- {
version = versions[i]
if version <= height {
break
}
}
}
keyWithVersionStr := string(key) + "|" + strconv.FormatInt(version, 10)
if existInUncommittedState {
value = app.UncommittedState[keyWithVersionStr]
} else {
keyWithVersion := []byte(keyWithVersionStr)
value = app.state.db.Get(keyWithVersion)
}
return nil, value
}
func (app *DIDApplication) GetCommittedStateDB(key []byte) (err error, value []byte) {
value = app.state.db.Get(key)
return nil, value
}
func (app *DIDApplication) GetCommittedVersionedStateDB(key []byte, height int64) (err error, value []byte) {
versionsKeyStr := string(key) + "|versions"
versionsKey := []byte(versionsKeyStr)
var versions []int64
keyVersionsProtobuf := app.state.db.Get(versionsKey)
var keyVersions data.KeyVersions
err = proto.Unmarshal([]byte(keyVersionsProtobuf), &keyVersions)
if err != nil {
return err, nil
}
versions = keyVersions.Versions
if len(versions) == 0 {
return nil, nil
}
var version int64
if height <= 0 {
version = versions[len(versions)-1]
} else {
for i := len(versions) - 1; i >= 0; i-- {
version = versions[i]
if version <= height {
break
}
}
}
keyWithVersionStr := string(key) + "|" + strconv.FormatInt(version, 10)
keyWithVersion := []byte(keyWithVersionStr)
value = app.state.db.Get(keyWithVersion)
return nil, value
}
func (app *DIDApplication) HasStateDB(key []byte) bool {
_, existInUncommittedState := app.UncommittedState[string(key)]
if existInUncommittedState {
return true
}
return app.state.db.Has(key)
}
func (app *DIDApplication) HasVersionedStateDB(key []byte) bool {
versionsKeyStr := string(key) + "|versions"
versionsKey := []byte(versionsKeyStr)
_, existInUncommittedState := app.UncommittedVersionsState[versionsKeyStr]
if existInUncommittedState {
return true
}
return app.state.db.Has(versionsKey)
}
func (app *DIDApplication) DeleteStateDB(key []byte) {
if !app.HasStateDB(key) {
return
}
app.HashData = append(app.HashData, key...)
app.HashData = append(app.HashData, []byte("delete")...) // Remove or replace with something else?
app.UncommittedState[string(key)] = nil
}
func (app *DIDApplication) DeleteVersionedStateDB(key []byte) {
if !app.HasVersionedStateDB(key) {
return
}
app.SetVersionedStateDB(key, nil)
}
func (app *DIDApplication) SaveDBState() {
batch := app.state.db.NewBatch()
defer batch.Close()
for key := range app.UncommittedState {
value := app.UncommittedState[key]
if value != nil {
batch.Set([]byte(key), value)
} else {
batch.Delete([]byte(key))
}
}
for key := range app.UncommittedVersionsState {
versions := app.UncommittedVersionsState[key]
var keyVersions data.KeyVersions
keyVersions.Versions = versions
value, err := utils.ProtoDeterministicMarshal(&keyVersions)
if err != nil {
panic(err) // Should panic or return err?
}
batch.Set([]byte(key), value)
}
batch.WriteSync()
app.UncommittedState = make(map[string][]byte)
app.UncommittedVersionsState = make(map[string][]int64)
}