内容简介:补充blockIdxInfo结构体定义:块索引信息。补充fileLocPointer、txindexInfo和common.BlockMetadata:func (index
//构造blockIndex func newBlockIndex(indexConfig *blkstorage.IndexConfig, db *leveldbhelper.DBHandle) *blockIndex //获取最后一个块索引(或编号),取key为"indexCheckpointKey"的值,即为最新的区块编号 func (index *blockIndex) getLastBlockIndexed() (uint64, error) func (index *blockIndex) indexBlock(blockIdxInfo *blockIdxInfo) error //索引区块 //根据区块哈希,获取文件区块指针 func (index *blockIndex) getBlockLocByHash(blockHash []byte) (*fileLocPointer, error) //根据区块编号,获取文件区块指针 func (index *blockIndex) getBlockLocByBlockNum(blockNum uint64) (*fileLocPointer, error) //根据交易ID,获取文件交易指针 func (index *blockIndex) getTxLoc(txID string) (*fileLocPointer, error) //根据交易ID,获取文件区块指针 func (index *blockIndex) getBlockLocByTxID(txID string) (*fileLocPointer, error) //根据区块编号和交易编号,获取文件交易指针 func (index *blockIndex) getTXLocByBlockNumTranNum(blockNum uint64, tranNum uint64) (*fileLocPointer, error) //根据交易ID,获取交易验证代码 func (index *blockIndex) getTxValidationCodeByTxID(txID string) (peer.TxValidationCode, error) //代码在common/ledger/blkstorage/fsblkstorage/blockindex.go
补充blockIdxInfo结构体定义:块索引信息。
type blockIdxInfo struct { blockNum uint64 //区块编号 blockHash []byte //区块哈希 flp *fileLocPointer //文件指针 txOffsets []*txindexInfo //交易索引信息 metadata *common.BlockMetadata } //代码在common/ledger/blkstorage/fsblkstorage/blockindex.go
补充fileLocPointer、txindexInfo和common.BlockMetadata:
type locPointer struct { //定义指针 offset int //偏移位置 bytesLength int //字节长度 } type fileLocPointer struct { //定义文件指针 fileSuffixNum int //文件后缀 locPointer //嵌入locPointer } //代码在common/ledger/blkstorage/fsblkstorage/blockindex.go type txindexInfo struct { //交易索引信息 txID string //交易ID loc *locPointer //文件指针 } //代码在common/ledger/blkstorage/fsblkstorage/block_serialization.go type BlockMetadata struct { Metadata [][]byte `protobuf:"bytes,1,rep,name=metadata,proto3" json:"metadata,omitempty"` } //代码在protos/common/common.pb.go
func (index blockIndex) indexBlock(blockIdxInfo blockIdxInfo) error代码如下:
flp := blockIdxInfo.flp //文件指针 txOffsets := blockIdxInfo.txOffsets //交易索引信息 txsfltr := ledgerUtil.TxValidationFlags(blockIdxInfo.metadata.Metadata[common.BlockMetadataIndex_TRANSACTIONS_FILTER]) //type TxValidationFlags []uint8 batch := leveldbhelper.NewUpdateBatch() //leveldb批量更新 flpBytes, err := flp.marshal() //文件指针序列化,含文件后缀、偏移位置、字节长度 if _, ok := index.indexItemsMap[blkstorage.IndexableAttrBlockHash]; ok { //使用区块哈希索引文件区块指针 batch.Put(constructBlockHashKey(blockIdxInfo.blockHash), flpBytes) //区块哈希,blockHash:flpBytes存入leveldb } if _, ok := index.indexItemsMap[blkstorage.IndexableAttrBlockNum]; ok { //使用区块编号索引文件区块指针 batch.Put(constructBlockNumKey(blockIdxInfo.blockNum), flpBytes) //区块编号,blockNum:flpBytes存入leveldb } if _, ok := index.indexItemsMap[blkstorage.IndexableAttrTxID]; ok { //使用交易ID索引文件交易指针 for _, txoffset := range txOffsets { txFlp := newFileLocationPointer(flp.fileSuffixNum, flp.offset, txoffset.loc) txFlpBytes, marshalErr := txFlp.marshal() batch.Put(constructTxIDKey(txoffset.txID), txFlpBytes) //交易ID,txID:txFlpBytes存入leveldb } } if _, ok := index.indexItemsMap[blkstorage.IndexableAttrBlockNumTranNum]; ok { //使用区块编号和交易编号索引文件交易指针 for txIterator, txoffset := range txOffsets { txFlp := newFileLocationPointer(flp.fileSuffixNum, flp.offset, txoffset.loc) txFlpBytes, marshalErr := txFlp.marshal() batch.Put(constructBlockNumTranNumKey(blockIdxInfo.blockNum, uint64(txIterator)), txFlpBytes) //区块编号和交易编号,blockNum+txIterator:txFlpBytes } } if _, ok := index.indexItemsMap[blkstorage.IndexableAttrBlockTxID]; ok { //使用交易ID索引文件区块指针 for _, txoffset := range txOffsets { batch.Put(constructBlockTxIDKey(txoffset.txID), flpBytes) //交易ID,txID:flpBytes } } if _, ok := index.indexItemsMap[blkstorage.IndexableAttrTxValidationCode]; ok { //使用交易ID索引交易验证代码 for idx, txoffset := range txOffsets { batch.Put(constructTxValidationCodeIDKey(txoffset.txID), []byte{byte(txsfltr.Flag(idx))}) } } batch.Put(indexCheckpointKey, encodeBlockNum(blockIdxInfo.blockNum)) //key为"indexCheckpointKey"的值,即为最新的区块编号 err := index.db.WriteBatch(batch, true) //批量更新 } //代码在common/ledger/blkstorage/fsblkstorage/blockindex.go
7、blocksItr结构体及方法
type blocksItr struct { mgr *blockfileMgr //blockfileMgr maxBlockNumAvailable uint64 //最大的区块编号 blockNumToRetrieve uint64 //起始区块编号 stream *blockStream //blockStream closeMarker bool closeMarkerLock *sync.Mutex } func newBlockItr(mgr *blockfileMgr, startBlockNum uint64) *blocksItr //构造blocksItr func (itr *blocksItr) waitForBlock(blockNum uint64) uint64 func (itr *blocksItr) initStream() error func (itr *blocksItr) shouldClose() bool func (itr *blocksItr) Next() (ledger.QueryResult, error) func (itr *blocksItr) Close() //代码在common/ledger/blkstorage/fsblkstorage/blocks_itr.go
8、blockfileMgr结构体定义及方法
blockfileMgr结构体定义:
type blockfileMgr struct { rootDir string //ledger文件存储目录,如/var/hyperledger/production/ledgersData/chains/chains/mychannel conf *Conf //即type Conf struct,存放路径和区块文件大小 db *leveldbhelper.DBHandle //用于操作index index index //type index interface,其实现为blockIndex结构体 cpInfo *checkpointInfo //type checkpointInfo struct cpInfoCond *sync.Cond //定期唤醒锁 currentFileWriter *blockfileWriter //type blockfileWriter struct bcInfo atomic.Value //原子操作 } //代码在common/ledger/blkstorage/fsblkstorage/blockfile_mgr.go
涉及方法如下:
//构建blockfileMgr func newBlockfileMgr(id string, conf *Conf, indexConfig *blkstorage.IndexConfig, indexStore *leveldbhelper.DBHandle) *blockfileMgr func syncCPInfoFromFS(rootDir string, cpInfo *checkpointInfo) //从文件系统中更新检查点信息 func deriveBlockfilePath(rootDir string, suffixNum int) string //构造Blockfile路径 func (mgr *blockfileMgr) close() //关闭blockfileWriter func (mgr *blockfileMgr) moveToNextFile() //转至下个新区块文件,打开新文件、并更新检查点信息 func (mgr *blockfileMgr) addBlock(block *common.Block) error //添加区块,区块写入文件,索引区块 func (mgr *blockfileMgr) syncIndex() error //同步区块索引 func (mgr *blockfileMgr) getBlockchainInfo() *common.BlockchainInfo //获取 BlockchainInfo func (mgr *blockfileMgr) updateCheckpoint(cpInfo *checkpointInfo) //更新检查点信息 func (mgr *blockfileMgr) updateBlockchainInfo(latestBlockHash []byte, latestBlock *common.Block) //更新BlockchainInfo //按区块哈希获取块,mgr.index.getBlockLocByHash(blockHash),mgr.fetchBlock(loc) func (mgr *blockfileMgr) retrieveBlockByHash(blockHash []byte) (*common.Block, error) //按区块编号获取块,mgr.index.getBlockLocByBlockNum(blockNum),mgr.fetchBlock(loc) func (mgr *blockfileMgr) retrieveBlockByNumber(blockNum uint64) (*common.Block, error) //按交易ID获取块,mgr.index.getBlockLocByTxID(txID),mgr.fetchBlock(loc) func (mgr *blockfileMgr) retrieveBlockByTxID(txID string) (*common.Block, error) //按交易ID获取交易验证代码,mgr.index.getTxValidationCodeByTxID(txID) func (mgr *blockfileMgr) retrieveTxValidationCodeByTxID(txID string) (peer.TxValidationCode, error) //按区块编号获取BlockHeader:按区块编号从索引中取文件区块指针,按文件指针取区块Bytes,按区块Bytes构建serializedBlockInfo,取serializedBlockInfo.blockHeader func (mgr *blockfileMgr) retrieveBlockHeaderByNumber(blockNum uint64) (*common.BlockHeader, error) //构造blocksItr func (mgr *blockfileMgr) retrieveBlocks(startNum uint64) (*blocksItr, error) //按交易ID获取交易,mgr.index.getTxLoc(txID),mgr.fetchTransactionEnvelope(loc) func (mgr *blockfileMgr) retrieveTransactionByID(txID string) (*common.Envelope, error) //按区块编号和交易编号获取交易,mgr.index.getTXLocByBlockNumTranNum(blockNum, tranNum),mgr.fetchTransactionEnvelope(loc) func (mgr *blockfileMgr) retrieveTransactionByBlockNumTranNum(blockNum uint64, tranNum uint64) (*common.Envelope, error) func (mgr *blockfileMgr) fetchBlock(lp *fileLocPointer) (*common.Block, error) //获取下一个块 //获取交易 //type Envelope struct { // Payload []byte // Signature []byte //} func (mgr *blockfileMgr) fetchTransactionEnvelope(lp *fileLocPointer) (*common.Envelope, error) //按文件指针获取区块Bytes func (mgr *blockfileMgr) fetchBlockBytes(lp *fileLocPointer) ([]byte, error) func (mgr *blockfileMgr) fetchRawBytes(lp *fileLocPointer) ([]byte, error) //按文件指针获取原始字节 func (mgr *blockfileMgr) loadCurrentInfo() (*checkpointInfo, error) //获取存储在index库中最新检查点信息,key为"blkMgrInfo" func (mgr *blockfileMgr) saveCurrentInfo(i *checkpointInfo, sync bool) error //将最新检查点信息,序列化后存入index库 //扫描给定的块文件并检测文件中的最后完整块,返回最后一个块字节、文件最新偏移量、块数 func scanForLastCompleteBlock(rootDir string, fileNum int, startingOffset int64) ([]byte, int64, int, error) { //代码在common/ledger/blkstorage/fsblkstorage/blockfile_mgr.go
func newBlockfileMgr(id string, conf Conf, indexConfig blkstorage.IndexConfig, indexStore leveldbhelper.DBHandle) blockfileMgr实现如下:构建blockfileMgr。
rootDir := conf.getLedgerBlockDir(id) //如/var/hyperledger/production/ledgersData/chains/chains/mychannel _, err := util.CreateDirIfMissing(rootDir) //检查rootDir是否存在,如不存在则创建 mgr := &blockfileMgr{rootDir: rootDir, conf: conf, db: indexStore} //构造blockfileMgr,包括ledger路径、块文件大小、index目录leveldb句柄 cpInfo, err := mgr.loadCurrentInfo() //获取存储在index库中最新检查点信息,key为"blkMgrInfo" if cpInfo == nil { //找不到,第一次创建ledger或index被删除 //扫描最新的blockfile,并重新构造检查点信息 cpInfo, err = constructCheckpointInfoFromBlockFiles(rootDir) } else { syncCPInfoFromFS(rootDir, cpInfo) //从文件系统中更新检查点信息 } err = mgr.saveCurrentInfo(cpInfo, true) //将最新检查点信息,序列化后存入index库 currentFileWriter, err := newBlockfileWriter(deriveBlockfilePath(rootDir, cpInfo.latestFileChunkSuffixNum)) err = currentFileWriter.truncateFile(cpInfo.latestFileChunksize) //按最新的区块文件大小截取文件 mgr.index = newBlockIndex(indexConfig, indexStore) 构造blockIndex mgr.cpInfo = cpInfo mgr.cpInfoCond = sync.NewCond(&sync.Mutex{}) mgr.syncIndex() bcInfo := &common.BlockchainInfo{ Height: 0, CurrentBlockHash: nil, PreviousBlockHash: nil} if !cpInfo.isChainEmpty { //如果不是空链 lastBlockHeader, err := mgr.retrieveBlockHeaderByNumber(cpInfo.lastBlockNumber) //获取最后一个块的Header lastBlockHash := lastBlockHeader.Hash() //最后一个块的哈希 previousBlockHash := lastBlockHeader.PreviousHash //前一个块的哈希 bcInfo = &common.BlockchainInfo{ //构造区块链信息 Height: cpInfo.lastBlockNumber + 1, CurrentBlockHash: lastBlockHash, PreviousBlockHash: previousBlockHash} } mgr.bcInfo.Store(bcInfo) //bcInfo赋值给mgr.bcInfo return mgr //代码在common/ledger/blkstorage/fsblkstorage/blockfile_mgr.go
func syncCPInfoFromFS(rootDir string, cpInfo *checkpointInfo)代码如下://从文件系统中更新检查点信息。
filePath := deriveBlockfilePath(rootDir, cpInfo.latestFileChunkSuffixNum) //最新区块文件路径 exists, size, err := util.FileExists(filePath) _, endOffsetLastBlock, numBlocks, err := scanForLastCompleteBlock( //扫描最后一个完整块 rootDir, cpInfo.latestFileChunkSuffixNum, int64(cpInfo.latestFileChunksize)) cpInfo.latestFileChunksize = int(endOffsetLastBlock) //最新的区块文件大小 if cpInfo.isChainEmpty { //空链 cpInfo.lastBlockNumber = uint64(numBlocks - 1) //最新的区块编号 } else { cpInfo.lastBlockNumber += uint64(numBlocks) } cpInfo.isChainEmpty = false //不再是空链 //代码在common/ledger/blkstorage/fsblkstorage/blockfile_mgr.go
func (mgr blockfileMgr) addBlock(block common.Block) error代码如下:添加区块,区块写入文件,索引区块。
//序列化区块,返回序列化后字节,以及serializedBlockInfo(含BlockHeader和交易索引信息) blockBytes, info, err := serializeBlock(block) blockHash := block.Header.Hash() //blockHash txOffsets := info.txOffsets //交易索引信息 currentOffset := mgr.cpInfo.latestFileChunksize //最新的区块文件大小 blockBytesLen := len(blockBytes) blockBytesEncodedLen := proto.EncodeVarint(uint64(blockBytesLen)) //blockBytesLen totalBytesToAppend := blockBytesLen + len(blockBytesEncodedLen) //blockBytesLen + blockBytesEncodedLen if currentOffset+totalBytesToAppend > mgr.conf.maxBlockfileSize { //超出文件大小限定,创建新文件 mgr.moveToNextFile() currentOffset = 0 } err = mgr.currentFileWriter.append(blockBytesEncodedLen, false) //追加写入blockBytesLen if err == nil { err = mgr.currentFileWriter.append(blockBytes, true) //追加写入blockBytes } if err != nil { //追加写入失败,回滚按原大小截取文件 truncateErr := mgr.currentFileWriter.truncateFile(mgr.cpInfo.latestFileChunksize) return fmt.Errorf("Error while appending block to file: %s", err) } currentCPInfo := mgr.cpInfo newCPInfo := &checkpointInfo{ latestFileChunkSuffixNum: currentCPInfo.latestFileChunkSuffixNum, latestFileChunksize: currentCPInfo.latestFileChunksize + totalBytesToAppend, isChainEmpty: false, lastBlockNumber: block.Header.Number} if err = mgr.saveCurrentInfo(newCPInfo, false); err != nil { //更新检查点信息 truncateErr := mgr.currentFileWriter.truncateFile(currentCPInfo.latestFileChunksize) //更新失败,回滚按原大小截取文件 return fmt.Errorf("Error while saving current file info to db: %s", err) } blockFLP := &fileLocPointer{fileSuffixNum: newCPInfo.latestFileChunkSuffixNum} blockFLP.offset = currentOffset for _, txOffset := range txOffsets { txOffset.loc.offset += len(blockBytesEncodedLen) //更新文件交易指针 } mgr.index.indexBlock(&blockIdxInfo{ //索引区块 blockNum: block.Header.Number, blockHash: blockHash, flp: blockFLP, txOffsets: txOffsets, metadata: block.Metadata}) mgr.updateCheckpoint(newCPInfo) //更新检查点信息 mgr.updateBlockchainInfo(blockHash, block) //更新BlockchainInfo return nil //代码在common/ledger/blkstorage/fsblkstorage/blockfile_mgr.go
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