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kvmvccdb.go
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kvmvccdb.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 kvmvccdb
import (
"github.com/bnchain/bnchain/common"
dbm "github.com/bnchain/bnchain/common/db"
clog "github.com/bnchain/bnchain/common/log"
log "github.com/bnchain/bnchain/common/log/log15"
"github.com/bnchain/bnchain/queue"
drivers "github.com/bnchain/bnchain/system/store"
"github.com/bnchain/bnchain/types"
"github.com/golang/protobuf/proto"
)
var klog = log.New("module", "kvmvccdb")
var maxRollbackNum = 200
// SetLogLevel set log level
func SetLogLevel(level string) {
clog.SetLogLevel(level)
}
// DisableLog disable log output
func DisableLog() {
klog.SetHandler(log.DiscardHandler())
}
func init() {
drivers.Reg("kvmvcc", New)
}
// KVMVCCStore provide kvmvcc store interface implementation
type KVMVCCStore struct {
*drivers.BaseStore
mvcc dbm.MVCC
kvsetmap map[string][]*types.KeyValue
enableMVCCIter bool
sync bool
}
type subConfig struct {
EnableMVCCIter bool `json:"enableMVCCIter"`
}
// New construct KVMVCCStore module
func New(cfg *types.Store, sub []byte) queue.Module {
bs := drivers.NewBaseStore(cfg)
var kvs *KVMVCCStore
enable := false
if sub != nil {
var subcfg subConfig
types.MustDecode(sub, &subcfg)
enable = subcfg.EnableMVCCIter
}
if enable {
kvs = &KVMVCCStore{bs, dbm.NewMVCCIter(bs.GetDB()), make(map[string][]*types.KeyValue), true, false}
} else {
kvs = &KVMVCCStore{bs, dbm.NewMVCC(bs.GetDB()), make(map[string][]*types.KeyValue), false, false}
}
bs.SetChild(kvs)
return kvs
}
// Close the KVMVCCStore module
func (mvccs *KVMVCCStore) Close() {
mvccs.BaseStore.Close()
klog.Info("store kvdb closed")
}
// Set kvs with statehash to KVMVCCStore
func (mvccs *KVMVCCStore) Set(datas *types.StoreSet, sync bool) ([]byte, error) {
hash := calcHash(datas)
kvlist, err := mvccs.mvcc.AddMVCC(datas.KV, hash, datas.StateHash, datas.Height)
if err != nil {
return nil, err
}
mvccs.saveKVSets(kvlist, sync)
return hash, nil
}
// Get kvs with statehash from KVMVCCStore
func (mvccs *KVMVCCStore) Get(datas *types.StoreGet) [][]byte {
values := make([][]byte, len(datas.Keys))
version, err := mvccs.mvcc.GetVersion(datas.StateHash)
if err != nil {
klog.Error("Get version by hash failed.", "hash", common.ToHex(datas.StateHash))
return values
}
for i := 0; i < len(datas.Keys); i++ {
value, err := mvccs.mvcc.GetV(datas.Keys[i], version)
if err != nil {
klog.Error("GetV by Keys failed.", "Key", string(datas.Keys[i]), "version", version)
} else if value != nil {
values[i] = value
}
}
return values
}
// MemSet set kvs to the mem of KVMVCCStore module and return the StateHash
func (mvccs *KVMVCCStore) MemSet(datas *types.StoreSet, sync bool) ([]byte, error) {
beg := types.Now()
defer func() {
klog.Info("kvmvcc MemSet", "cost", types.Since(beg))
}()
kvset, err := mvccs.checkVersion(datas.Height)
if err != nil {
return nil, err
}
hash := calcHash(datas)
//klog.Debug("KVMVCCStore MemSet AddMVCC", "prestatehash", common.ToHex(datas.StateHash), "hash", common.ToHex(hash), "height", datas.Height)
kvlist, err := mvccs.mvcc.AddMVCC(datas.KV, hash, datas.StateHash, datas.Height)
if err != nil {
return nil, err
}
if len(kvlist) > 0 {
kvset = append(kvset, kvlist...)
}
mvccs.sync = sync
mvccs.kvsetmap[string(hash)] = kvset
return hash, nil
}
// Commit kvs in the mem of KVMVCCStore module to state db and return the StateHash
func (mvccs *KVMVCCStore) Commit(req *types.ReqHash) ([]byte, error) {
beg := types.Now()
defer func() {
klog.Info("kvmvcc Commit", "cost", types.Since(beg))
}()
_, ok := mvccs.kvsetmap[string(req.Hash)]
if !ok {
klog.Error("store kvmvcc commit", "err", types.ErrHashNotFound)
return nil, types.ErrHashNotFound
}
//klog.Debug("KVMVCCStore Commit saveKVSets", "hash", common.ToHex(req.Hash))
mvccs.saveKVSets(mvccs.kvsetmap[string(req.Hash)], mvccs.sync)
delete(mvccs.kvsetmap, string(req.Hash))
return req.Hash, nil
}
// MemSetUpgrade set kvs to the mem of KVMVCCStore module and return the StateHash
func (mvccs *KVMVCCStore) MemSetUpgrade(datas *types.StoreSet, sync bool) ([]byte, error) {
//not support
return nil, nil
}
// CommitUpgrade kvs in the mem of KVMVCCStore module to state db and return the StateHash
func (mvccs *KVMVCCStore) CommitUpgrade(req *types.ReqHash) ([]byte, error) {
//not support
return nil, nil
}
// Rollback kvs in the mem of KVMVCCStore module and return the StateHash
func (mvccs *KVMVCCStore) Rollback(req *types.ReqHash) ([]byte, error) {
_, ok := mvccs.kvsetmap[string(req.Hash)]
if !ok {
klog.Error("store kvmvcc rollback", "err", types.ErrHashNotFound)
return nil, types.ErrHashNotFound
}
//klog.Debug("KVMVCCStore Rollback", "hash", common.ToHex(req.Hash))
delete(mvccs.kvsetmap, string(req.Hash))
return req.Hash, nil
}
// IterateRangeByStateHash travel with Prefix by StateHash to get the latest version kvs.
func (mvccs *KVMVCCStore) IterateRangeByStateHash(statehash []byte, start []byte, end []byte, ascending bool, fn func(key, value []byte) bool) {
if !mvccs.enableMVCCIter {
panic("call IterateRangeByStateHash when disable mvcc iter")
}
//按照kv最新值来进行遍历处理,要求statehash必须是最新区块的statehash,否则不支持该接口
maxVersion, err := mvccs.mvcc.GetMaxVersion()
if err != nil {
klog.Error("KVMVCCStore IterateRangeByStateHash can't get max version, ignore the call.", "err", err)
return
}
version, err := mvccs.mvcc.GetVersion(statehash)
if err != nil {
klog.Error("KVMVCCStore IterateRangeByStateHash can't get version, ignore the call.", "stateHash", common.ToHex(statehash), "err", err)
return
}
if version != maxVersion {
klog.Error("KVMVCCStore IterateRangeByStateHash call failed for maxVersion does not match version.", "maxVersion", maxVersion, "version", version, "stateHash", common.ToHex(statehash))
return
}
//klog.Info("KVMVCCStore do the IterateRangeByStateHash")
listhelper := dbm.NewListHelper(mvccs.mvcc.(*dbm.MVCCIter))
listhelper.IteratorCallback(start, end, 0, 1, fn)
}
// ProcEvent handles supported events
func (mvccs *KVMVCCStore) ProcEvent(msg *queue.Message) {
if msg == nil {
return
}
msg.ReplyErr("KVStore", types.ErrActionNotSupport)
}
// Del set kvs to nil with StateHash
func (mvccs *KVMVCCStore) Del(req *types.StoreDel) ([]byte, error) {
kvset, err := mvccs.mvcc.DelMVCC(req.StateHash, req.Height, true)
if err != nil {
klog.Error("store kvmvcc del", "err", err)
return nil, err
}
klog.Info("KVMVCCStore Del", "hash", common.ToHex(req.StateHash), "height", req.Height)
mvccs.saveKVSets(kvset, mvccs.sync)
return req.StateHash, nil
}
func (mvccs *KVMVCCStore) saveKVSets(kvset []*types.KeyValue, sync bool) {
if len(kvset) == 0 {
return
}
storeBatch := mvccs.GetDB().NewBatch(sync)
for i := 0; i < len(kvset); i++ {
if kvset[i].Value == nil {
storeBatch.Delete(kvset[i].Key)
} else {
storeBatch.Set(kvset[i].Key, kvset[i].Value)
}
}
err := storeBatch.Write()
if err != nil {
klog.Error("store kvmvcc saveKVSets to db failed")
}
}
func (mvccs *KVMVCCStore) checkVersion(height int64) ([]*types.KeyValue, error) {
//检查新加入区块的height和现有的version的关系,来判断是否要回滚数据
maxVersion, err := mvccs.mvcc.GetMaxVersion()
if err != nil {
if err != types.ErrNotFound {
klog.Error("store kvmvcc checkVersion GetMaxVersion failed", "err", err)
panic(err)
} else {
maxVersion = -1
}
}
//klog.Debug("store kvmvcc checkVersion ", "maxVersion", maxVersion, "currentVersion", height)
var kvset []*types.KeyValue
if maxVersion < height-1 {
klog.Error("store kvmvcc checkVersion found statehash lost", "maxVersion", maxVersion, "height", height)
return nil, ErrStateHashLost
} else if maxVersion == height-1 {
return nil, nil
} else {
count := 1
for i := maxVersion; i >= height; i-- {
hash, err := mvccs.mvcc.GetVersionHash(i)
if err != nil {
klog.Warn("store kvmvcc checkVersion GetVersionHash failed", "height", i, "maxVersion", maxVersion)
continue
}
kvlist, err := mvccs.mvcc.DelMVCC(hash, i, false)
if err != nil {
klog.Warn("store kvmvcc checkVersion DelMVCC failed", "height", i, "err", err)
continue
}
kvset = append(kvset, kvlist...)
klog.Debug("store kvmvcc checkVersion DelMVCC4Height", "height", i, "maxVersion", maxVersion)
//为避免高度差过大时出现异常,做一个保护,一次最多回滚200个区块
count++
if count >= maxRollbackNum {
break
}
}
}
return kvset, nil
}
func calcHash(datas proto.Message) []byte {
b := types.Encode(datas)
return common.Sha256(b)
}