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mavl.go
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mavl.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 kvmvccmavl
import (
"sync"
"github.com/bnchain/bnchain/common"
dbm "github.com/bnchain/bnchain/common/db"
"github.com/bnchain/bnchain/queue"
"github.com/bnchain/bnchain/system/store/mavl/db"
"github.com/bnchain/bnchain/types"
)
const (
// 同store/mavl中定义保持一致,即裁剪的加前缀
hashNodePrefix = "_mh_"
leafNodePrefix = "_mb_"
leafKeyCountPrefix = "..mk.."
oldLeafKeyCountPrefix = "..mok.."
)
// MavlStore mavl store struct
type MavlStore struct {
db dbm.DB
trees *sync.Map
enableMavlPrefix bool
enableMVCC bool
enableMavlPrune bool
pruneHeight int32
}
// NewMavl new mavl store module
func NewMavl(sub *subMavlConfig, db dbm.DB) *MavlStore {
var subcfg subMavlConfig
if sub != nil {
subcfg.EnableMavlPrefix = sub.EnableMavlPrefix
subcfg.EnableMVCC = sub.EnableMVCC
subcfg.EnableMavlPrune = sub.EnableMavlPrune
subcfg.PruneHeight = sub.PruneHeight
subcfg.EnableMemTree = sub.EnableMemTree
subcfg.EnableMemVal = sub.EnableMemVal
subcfg.TkCloseCacheLen = sub.TkCloseCacheLen
}
mavls := &MavlStore{db, &sync.Map{}, subcfg.EnableMavlPrefix, subcfg.EnableMVCC, subcfg.EnableMavlPrune, subcfg.PruneHeight}
mavl.EnableMavlPrefix(subcfg.EnableMavlPrefix)
mavl.EnableMVCC(subcfg.EnableMVCC)
mavl.EnablePrune(subcfg.EnableMavlPrune)
mavl.SetPruneHeight(int(subcfg.PruneHeight))
mavl.EnableMemTree(subcfg.EnableMemTree)
mavl.EnableMemVal(subcfg.EnableMemVal)
mavl.TkCloseCacheLen(subcfg.TkCloseCacheLen)
return mavls
}
// Close close mavl store
func (mavls *MavlStore) Close() {
mavl.ClosePrune()
kmlog.Info("store mavl closed")
}
// Set set k v to mavl store db; sync is true represent write sync
func (mavls *MavlStore) Set(datas *types.StoreSet, sync bool) ([]byte, error) {
return mavl.SetKVPair(mavls.db, datas, sync)
}
// Get get values by keys
func (mavls *MavlStore) Get(datas *types.StoreGet) [][]byte {
var tree *mavl.Tree
var err error
values := make([][]byte, len(datas.Keys))
search := string(datas.StateHash)
if data, ok := mavls.trees.Load(search); ok {
tree = data.(*mavl.Tree)
} else {
tree = mavl.NewTree(mavls.db, true)
//get接口也应该传入高度
//tree.SetBlockHeight(datas.Height)
err = tree.Load(datas.StateHash)
kmlog.Debug("store mavl get tree", "err", err, "StateHash", common.ToHex(datas.StateHash))
}
if err == nil {
for i := 0; i < len(datas.Keys); i++ {
_, value, exit := tree.Get(datas.Keys[i])
if exit {
values[i] = value
}
}
}
return values
}
// MemSet set keys values to memcory mavl, return root hash and error
func (mavls *MavlStore) MemSet(datas *types.StoreSet, sync bool) ([]byte, error) {
beg := types.Now()
defer func() {
kmlog.Debug("mavl MemSet", "cost", types.Since(beg))
}()
if len(datas.KV) == 0 {
kmlog.Info("store mavl memset,use preStateHash as stateHash for kvset is null")
mavls.trees.Store(string(datas.StateHash), nil)
return datas.StateHash, nil
}
tree := mavl.NewTree(mavls.db, sync)
tree.SetBlockHeight(datas.Height)
err := tree.Load(datas.StateHash)
if err != nil {
return nil, err
}
for i := 0; i < len(datas.KV); i++ {
tree.Set(datas.KV[i].Key, datas.KV[i].Value)
}
hash := tree.Hash()
mavls.trees.Store(string(hash), tree)
return hash, nil
}
// MemSetUpgrade 计算hash之后不在内存中存储树
func (mavls *MavlStore) MemSetUpgrade(datas *types.StoreSet, sync bool) ([]byte, error) {
beg := types.Now()
defer func() {
kmlog.Debug("mavl MemSet", "cost", types.Since(beg))
}()
if len(datas.KV) == 0 {
kmlog.Info("store mavl memset,use preStateHash as stateHash for kvset is null")
return datas.StateHash, nil
}
tree := mavl.NewTree(mavls.db, sync)
tree.SetBlockHeight(datas.Height)
err := tree.Load(datas.StateHash)
if err != nil {
return nil, err
}
for i := 0; i < len(datas.KV); i++ {
tree.Set(datas.KV[i].Key, datas.KV[i].Value)
}
hash := tree.Hash()
return hash, nil
}
// Commit convert memcory mavl to storage db
func (mavls *MavlStore) Commit(req *types.ReqHash) ([]byte, error) {
beg := types.Now()
defer func() {
kmlog.Debug("mavl Commit", "cost", types.Since(beg))
}()
tree, ok := mavls.trees.Load(string(req.Hash))
if !ok {
kmlog.Error("store mavl commit", "err", types.ErrHashNotFound)
return nil, types.ErrHashNotFound
}
if tree == nil {
kmlog.Info("store mavl commit,do nothing for kvset is null")
mavls.trees.Delete(string(req.Hash))
return req.Hash, nil
}
hash := tree.(*mavl.Tree).Save()
if hash == nil {
kmlog.Error("store mavl commit", "err", types.ErrHashNotFound)
return nil, types.ErrDataBaseDamage
}
mavls.trees.Delete(string(req.Hash))
return req.Hash, nil
}
// Rollback 回退将缓存的mavl树删除掉
func (mavls *MavlStore) Rollback(req *types.ReqHash) ([]byte, error) {
beg := types.Now()
defer func() {
kmlog.Debug("Rollback", "cost", types.Since(beg))
}()
_, ok := mavls.trees.Load(string(req.Hash))
if !ok {
kmlog.Error("store mavl rollback", "err", types.ErrHashNotFound)
return nil, types.ErrHashNotFound
}
mavls.trees.Delete(string(req.Hash))
return req.Hash, nil
}
// IterateRangeByStateHash 迭代实现功能; statehash:当前状态hash, start:开始查找的key, end: 结束的key, ascending:升序,降序, fn 迭代回调函数
func (mavls *MavlStore) IterateRangeByStateHash(statehash []byte, start []byte, end []byte, ascending bool, fn func(key, value []byte) bool) {
mavl.IterateRangeByStateHash(mavls.db, statehash, start, end, ascending, fn)
}
// ProcEvent not support message
func (mavls *MavlStore) ProcEvent(msg queue.Message) {
msg.ReplyErr("Store", types.ErrActionNotSupport)
}
// Del ...
func (mavls *MavlStore) Del(req *types.StoreDel) ([]byte, error) {
//not support
return nil, nil
}