/
util.go
221 lines (196 loc) · 5.35 KB
/
util.go
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// Copyright Fuzamei Corp. 2018 All Rights Reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package dapp
import (
"fmt"
"github.com/assetcloud/chain/common/db"
"github.com/assetcloud/chain/types"
)
// HeightIndexStr height and index format string
func HeightIndexStr(height, index int64) string {
v := height*types.MaxTxsPerBlock + index
return fmt.Sprintf("%018d", v)
}
// KVCreator 创建KV的辅助工具
type KVCreator struct {
kvs []*types.KeyValue
kvdb db.KV
autorollback bool
prefix []byte
rollbackkey []byte
rollbackkvs []*types.KeyValue
}
// NewKVCreator 创建创建者
// 注意: 自动回滚可能会严重影响系统性能
func NewKVCreator(kv db.KV, prefix []byte, rollbackkey []byte) *KVCreator {
return &KVCreator{
kvdb: kv,
prefix: prefix,
rollbackkey: rollbackkey,
autorollback: rollbackkey != nil,
}
}
func (c *KVCreator) addPrefix(key []byte) []byte {
newkey := append([]byte{}, c.prefix...)
return append(newkey, key...)
}
func (c *KVCreator) add(key, value []byte, set bool) *KVCreator {
if c.prefix != nil {
key = c.addPrefix(key)
}
return c.addnoprefix(key, value, set)
}
func (c *KVCreator) addnoprefix(key, value []byte, set bool) *KVCreator {
if c.autorollback {
prev, err := c.kvdb.Get(key)
//数据库发生错误,直接panic (再执行器中会recover)
if err != nil && err != types.ErrNotFound {
panic(err)
}
if value == nil { //del
//不需要做任何处理, 也不用加入 kvs
if err == types.ErrNotFound {
return c
}
rb := &types.KeyValue{Key: key, Value: prev}
c.rollbackkvs = append(c.rollbackkvs, rb)
} else {
if err == types.ErrNotFound { //add
rb := &types.KeyValue{Key: key}
c.rollbackkvs = append(c.rollbackkvs, rb)
} else { //update
rb := &types.KeyValue{Key: key, Value: prev}
c.rollbackkvs = append(c.rollbackkvs, rb)
}
}
}
c.kvs = append(c.kvs, &types.KeyValue{Key: key, Value: value})
if set {
err := c.kvdb.Set(key, value)
if err != nil {
panic(err)
}
}
return c
}
// Get 从KV中获取 value
func (c *KVCreator) Get(key []byte) ([]byte, error) {
if c.prefix != nil {
newkey := c.addPrefix(key)
return c.kvdb.Get(newkey)
}
return c.kvdb.Get(key)
}
// GetNoPrefix 从KV中获取 value, 不自动添加前缀
func (c *KVCreator) GetNoPrefix(key []byte) ([]byte, error) {
return c.kvdb.Get(key)
}
// Add add and set to kvdb
func (c *KVCreator) Add(key, value []byte) *KVCreator {
return c.add(key, value, true)
}
// AddNoPrefix 不自动添加prefix
func (c *KVCreator) AddNoPrefix(key, value []byte) *KVCreator {
return c.addnoprefix(key, value, true)
}
// AddListNoPrefix only add KVList
func (c *KVCreator) AddListNoPrefix(list []*types.KeyValue) *KVCreator {
for _, kv := range list {
c.addnoprefix(kv.Key, kv.Value, true)
}
return c
}
// AddList only add KVList
func (c *KVCreator) AddList(list []*types.KeyValue) *KVCreator {
for _, kv := range list {
c.add(kv.Key, kv.Value, true)
}
return c
}
// AddKVOnly only add KV(can't auto rollback)
func (c *KVCreator) AddKVOnly(key, value []byte) *KVCreator {
if c.autorollback {
panic("autorollback open, AddKVOnly not allow")
}
return c.add(key, value, false)
}
// AddKVListOnly only add KVList (can't auto rollback)
func (c *KVCreator) AddKVListOnly(list []*types.KeyValue) *KVCreator {
if c.autorollback {
panic("autorollback open, AddKVListOnly not allow")
}
for _, kv := range list {
c.add(kv.Key, kv.Value, false)
}
return c
}
// KVList 读取所有的kv列表
func (c *KVCreator) KVList() []*types.KeyValue {
return c.kvs
}
// AddRollbackKV 添加回滚数据到 KV
func (c *KVCreator) AddRollbackKV() {
rbLog := c.rollbackLog()
if rbLog != nil {
v := types.Encode(rbLog)
c.kvs = append(c.kvs, &types.KeyValue{Key: c.rollbackkey, Value: v})
}
}
// DelRollbackKV 删除rollback kv
func (c *KVCreator) DelRollbackKV() {
if len(c.kvs) > 0 {
c.kvs = append(c.kvs, &types.KeyValue{Key: c.rollbackkey})
}
}
// GetRollbackKVList 获取 rollback 到 Key and Vaue
func (c *KVCreator) GetRollbackKVList() ([]*types.KeyValue, error) {
data, err := c.kvdb.Get(c.rollbackkey)
if err == types.ErrNotFound {
return nil, nil
}
if err != nil {
return nil, err
}
var rollbacklog types.ReceiptLog
err = types.Decode(data, &rollbacklog)
if err != nil {
return nil, err
}
kvs, err := c.parseRollback(&rollbacklog)
if err != nil {
return nil, err
}
//reverse kvs
for left, right := 0, len(kvs)-1; left < right; left, right = left+1, right-1 {
kvs[left], kvs[right] = kvs[right], kvs[left]
}
return kvs, nil
}
// rollbackLog rollback log
func (c *KVCreator) rollbackLog() *types.ReceiptLog {
if len(c.rollbackkvs) == 0 {
return nil
}
data := types.Encode(&types.LocalDBSet{KV: c.rollbackkvs})
return &types.ReceiptLog{Ty: types.TyLogRollback, Log: data}
}
// ParseRollback 解析rollback的数据
func (c *KVCreator) parseRollback(log *types.ReceiptLog) ([]*types.KeyValue, error) {
var data types.LocalDBSet
if log.Ty != types.TyLogRollback {
return nil, types.ErrInvalidParam
}
err := types.Decode(log.Log, &data)
if err != nil {
return nil, err
}
return data.KV, nil
}
// AddToLogs add not empty log to logs
func (c *KVCreator) AddToLogs(logs []*types.ReceiptLog) []*types.ReceiptLog {
if len(c.rollbackkvs) == 0 {
return logs
}
return append(logs, c.rollbackLog())
}