/
export_block.go
388 lines (346 loc) · 11.6 KB
/
export_block.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 blockchain
import (
"bytes"
"errors"
"fmt"
"io/ioutil"
"os/user"
"path/filepath"
"sync/atomic"
"syscall"
"github.com/assetcloud/chain/common"
dbm "github.com/assetcloud/chain/common/db"
"github.com/assetcloud/chain/types"
)
var (
fileHeaderKey = []byte("F:header:")
endBlockKey = []byte("F:endblock:")
blockHeightKey = []byte("F:blockH:")
blockCount int64 = 1024 //只处理当前高度减去1024之前的区块,避免导出侧链的数据
dbCache int32 = 4
exportlog = chainlog.New("submodule", "export")
)
// errors
var (
ErrIsOrphan = errors.New("ErrIsOrphan")
ErrIsSideChain = errors.New("ErrIsSideChain")
ErrBlockHeightDiscontinuous = errors.New("ErrBlockHeightDiscontinuous")
ErrCurHeightMoreThanEndHeight = errors.New("ErrCurHeightMoreThanEndHeight")
)
func calcblockHeightKey(height int64) []byte {
return append(blockHeightKey, []byte(fmt.Sprintf("%012d", height))...)
}
// ExportBlockProc 通过title导出对应的区块到指定文件中
func (chain *BlockChain) ExportBlockProc(title string, dir string, startHeight int64) {
//获取文件路径
dataDir := getDataDir(dir)
err := chain.ExportBlock(title, dataDir, startHeight)
exportlog.Info("ExportBlockProc:complete", "title", title, "dir", dir, "err", err)
syscall.Exit(0)
}
// ImportBlockProc 导入区块的处理,区块导入结束后退出整个系统
func (chain *BlockChain) ImportBlockProc(filename string, dir string) {
//获取文件路径,空字符串默认当前目录下
dataDir := getDataDir(dir)
//从文件导入区块期间,执行区块设置成不刷磁盘,提高写入数据库的效率
if !chain.cfgBatchSync {
atomic.CompareAndSwapInt32(&chain.isbatchsync, 1, 0)
}
err := chain.ImportBlock(filename, dataDir)
exportlog.Info("importBlock:complete", "filename", filename, "dir", dir, "err", err)
syscall.Exit(0)
}
// ExportBlock 通过指定title和起始高度将block信息导出到一个指定文件中。
// title:chain/bityuan
// startHeight:需要导入/导出的起始高度
// dbPath:存储到指定路径,默认当前目录下
func (chain *BlockChain) ExportBlock(title, dbPath string, startHeight int64) error {
exportlog.Info("exportBlock", "title", title, "startHeight", startHeight, "dbPath", dbPath)
if startHeight < 0 {
return types.ErrInvalidParam
}
cfg := chain.client.GetConfig()
cfgTitle := cfg.GetTitle()
//title检测
if len(title) == 0 {
title = cfgTitle
}
if title != cfgTitle {
exportlog.Error("exportBlock", "title", title, "configTitle", cfgTitle)
return types.ErrInvalidParam
}
//获取blockstore中当前区块的最新高度
curheight, err := LoadBlockStoreHeight(chain.blockStore.db)
if err != nil || curheight < 0 {
exportlog.Error("exportBlock:LoadBlockStoreHeight", "curheight", curheight, "err", err.Error())
return err
}
if startHeight+blockCount >= curheight {
exportlog.Info("exportBlock:startHeight+blockCount >= height", "curheight", curheight)
return types.ErrInvalidParam
}
exportdb := dbm.NewDB(title, chain.cfg.Driver, dbPath, dbCache)
defer exportdb.Close()
var fileExist bool
//判断导出文件是否已经存在,校验已经存在的导出文件头信息
oldfileHeader, err := getFileHeader(exportdb)
if err == nil && oldfileHeader != nil {
newfileHeader := types.FileHeader{
Title: title,
Driver: chain.cfg.Driver,
TestNet: cfg.IsTestNet(),
}
if !isValidFileHeader(oldfileHeader, &newfileHeader) {
exportlog.Error("exportBlock:inValidFileHeader", "oldfileHeader", oldfileHeader, "newfileHeader", newfileHeader.String())
return types.ErrInValidFileHeader
}
//需要在已有导出的endheight区块继续接着导出,需要校验endHeight
endBlock, err := getEndBlock(exportdb)
if err != nil {
exportlog.Error("exportBlock:EndHeight", "error", err)
return err
}
if endBlock.Height < startHeight || endBlock.Height > curheight-blockCount {
exportlog.Error("exportBlock:endHeight<startHeight", "endHeight", endBlock.Height, "startHeight", startHeight, "error", err)
return types.ErrBlockHeight
}
// 需要校验block是否连续
block, err := chain.blockStore.LoadBlock(endBlock.Height+1, nil)
if err != nil {
exportlog.Error("exportBlock:LoadBlock", "Height", endBlock.Height+1, "error", err)
return err
}
parentHash := block.Block.ParentHash
if !bytes.Equal(endBlock.Hash, parentHash) {
exportlog.Error("exportBlock:block discontinuous", "endHeight", endBlock.Height, "hash", common.ToHex(endBlock.Hash), "nextHeight", endBlock.Height+1, "parentHash", common.ToHex(parentHash), "hash", common.ToHex(block.Block.Hash(cfg)))
return types.ErrBlockHashNoMatch
}
fileExist = true
startHeight = endBlock.Height + 1
}
batch := exportdb.NewBatch(false)
// 设置导出文件头信息
if !fileExist {
fileHeader := types.FileHeader{
Title: title,
Driver: chain.cfg.Driver,
TestNet: cfg.IsTestNet(),
StartHeight: startHeight,
}
setFileHeader(batch, &fileHeader)
endBlock := types.EndBlock{
Height: startHeight,
Hash: zeroHash[:],
}
setEndBlock(batch, &endBlock)
err = batch.Write()
if err != nil {
exportlog.Error("exportBlock:batch.Write()", "error", err)
return err
}
batch.Reset()
}
return chain.exportMainBlock(startHeight, curheight-blockCount, batch)
}
// 导出主链block信息到文件中
func (chain *BlockChain) exportMainBlock(startHeight, endheight int64, batch dbm.Batch) error {
cfg := chain.client.GetConfig()
var count = 0
for height := startHeight; height <= endheight; height++ {
block, err := chain.blockStore.LoadBlock(height, nil)
if err != nil {
exportlog.Error("exportMainBlock:LoadBlock", "height", height, "error", err)
return err
}
count += block.Size()
blockinfo := types.Encode(block.Block)
batch.Set(calcblockHeightKey(height), blockinfo)
endBlock := types.EndBlock{
Height: height,
Hash: block.Block.Hash(cfg),
}
setEndBlock(batch, &endBlock)
if count > types.MaxBlockSizePerTime {
exportlog.Info("exportBlock", "height", height)
err := batch.Write()
if err != nil {
storeLog.Error("exportMainBlock:batch.Write()", "height", height, "error", err)
return err
}
batch.Reset()
count = 0
}
}
if count > 0 {
err := batch.Write()
if err != nil {
exportlog.Error("exportMainBlock:batch.Write()", "height", endheight, "error", err)
return err
}
exportlog.Info("exportBlock:complete!", "endheight", endheight)
batch.Reset()
}
return nil
}
// ImportBlock 通过指定文件导入block
func (chain *BlockChain) ImportBlock(filename, dbPath string) error {
cfg := chain.client.GetConfig()
if len(filename) == 0 {
filename = cfg.GetTitle()
}
db := dbm.NewDB(filename, chain.cfg.Driver, dbPath, dbCache)
defer db.Close()
//获取文件头信息并做基本的校验
newfileHeader := types.FileHeader{
Title: cfg.GetTitle(),
Driver: chain.cfg.Driver,
TestNet: cfg.IsTestNet(),
}
fileHeader, err := getFileHeader(db)
if err != nil || fileHeader.StartHeight < 0 || !isValidFileHeader(fileHeader, &newfileHeader) {
exportlog.Error("importBlock:fileHeader", "filename", filename, "dbPath", dbPath, "fileHeader", fileHeader, "cfg.fileHeader", newfileHeader.String(), "err", err)
return types.ErrInValidFileHeader
}
startHeight := fileHeader.StartHeight
endBlock, err := getEndBlock(db)
if err != nil {
exportlog.Error("importBlock:getEndBlock", "error", err)
return err
}
endHeight := endBlock.Height
// 获取当前链的区块高度,并校验当前高度和要导入的文件中的startHeight高度
//当前高度小于startHeight时,区块高度无法连续返回错误
//从当前高度继续读取区块并处理
curheight := chain.GetBlockHeight()
if curheight < startHeight {
exportlog.Error("importBlock", "curheight", curheight, "startHeight", startHeight)
return ErrBlockHeightDiscontinuous
}
if curheight > endHeight {
exportlog.Error("importBlock", "curheight", curheight, "endHeight", endHeight)
return ErrCurHeightMoreThanEndHeight
}
if curheight >= startHeight {
startHeight = curheight + 1
}
//从文件开始导入block
for i := startHeight; i <= endHeight; i++ {
block, err := getBlock(db, i)
if err != nil {
exportlog.Error("importBlock:getBlock", "Height", i, "err", err)
return err
}
err = chain.mainChainImport(block)
if err != nil {
exportlog.Error("importBlock:mainChainImport", "Height", i, "err", err)
return err
}
}
return nil
}
// mainChainImport 主链的导入区块处理函数
func (chain *BlockChain) mainChainImport(block *types.Block) error {
cfg := chain.client.GetConfig()
blockDetail := types.BlockDetail{
Block: block,
}
exportlog.Info("mainChainImport", "height", block.Height, "Hash", common.ToHex(block.Hash(cfg)), "ParentHash", common.ToHex(block.ParentHash))
_, isMainChain, isOrphan, err := chain.ProcessBlock(false, &blockDetail, "import", true, -1)
if err == types.ErrBlockExist {
return nil
} else if err != nil {
return err
}
if !isMainChain {
return ErrIsSideChain
}
if isOrphan {
return ErrIsOrphan
}
return nil
}
// isValidFileHeader 校验文件头信息
func isValidFileHeader(oldFileHeader, newFileHeader *types.FileHeader) bool {
if oldFileHeader.Title != newFileHeader.Title ||
oldFileHeader.Driver != newFileHeader.Driver ||
oldFileHeader.TestNet != newFileHeader.TestNet {
return false
}
return true
}
// getFileHeader获取文件头信息
func getFileHeader(db dbm.DB) (*types.FileHeader, error) {
headertitle, err := db.Get(fileHeaderKey)
if err != nil {
return nil, err
}
var fileHeader types.FileHeader
err = types.Decode(headertitle, &fileHeader)
if err != nil {
exportlog.Error("getFileHeader", "headertitle", string(headertitle), "err", err)
return nil, err
}
return &fileHeader, nil
}
// setFileHeader 设置文件头信息到数据库中
func setFileHeader(batch dbm.Batch, fileHeader *types.FileHeader) {
fileHeaderinfo := types.Encode(fileHeader)
batch.Set(fileHeaderKey, fileHeaderinfo)
}
// getEndBlock 获取endblock的信息
func getEndBlock(db dbm.DB) (*types.EndBlock, error) {
var endBlock types.EndBlock
storeEndHeight, err := db.Get(endBlockKey)
if err != nil {
exportlog.Error("getEndBlock", "error", err)
return nil, err
}
err = types.Decode(storeEndHeight, &endBlock)
if err != nil || endBlock.Height < 0 {
exportlog.Error("getEndBlock:Unmarshal", "storeEndHeight", string(storeEndHeight), "error", err)
return nil, err
}
return &endBlock, nil
}
// setEndBlock 设置endblock的信息
func setEndBlock(batch dbm.Batch, endBlock *types.EndBlock) {
endBlockinfo := types.Encode(endBlock)
batch.Set(endBlockKey, endBlockinfo)
}
// 从数据库中获取对应高度的block信息
func getBlock(db dbm.DB, height int64) (*types.Block, error) {
data, err := db.Get(calcblockHeightKey(height))
if err != nil {
exportlog.Error("getBlock:storeblock", "Height", height, "err", err)
return nil, err
}
var block types.Block
err = types.Decode(data, &block)
if err != nil {
exportlog.Error("getBlock:Decode", "err", err)
return nil, err
}
return &block, nil
}
// getDataDir 获取文件路径 "/something/~/something/"
func getDataDir(datadir string) string {
if len(datadir) >= 2 && datadir[:2] == "~/" {
usr, err := user.Current()
if err != nil {
panic(err)
}
dir := usr.HomeDir
datadir = filepath.Join(dir, datadir[2:])
}
if len(datadir) >= 6 && datadir[:6] == "$TEMP/" {
dir, err := ioutil.TempDir("", "chaindatadir-")
if err != nil {
panic(err)
}
datadir = filepath.Join(dir, datadir[6:])
}
return datadir
}