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## 4、交易相关部分工具函数(protos/utils包) putils更详细内容,参考:Fabric 1.0源代码笔记 之 putils(protos/utils工具包) ## 5、RWSet(读写集) RWSet更详细内容,参考:Fabric 1.0源代码笔记 之 Tx #RWSet(读写集) ## 6、version.Height结构体及方法 ```go type Height struct { BlockNum uint64 //区块编号 TxNum uint64 //交易编号 } func NewHeight(blockNum, txNum uint64) *Height //构造Height func NewHeightFromBytes(b []byte) (*Height, int) //[]byte反序列化构造Height func (h *Height) ToBytes() []byte //Height序列化 func (h *Height) Compare(h1 *Height) int //比较两个Height func AreSame(h1 *Height, h2 *Height) bool //比较两个Height是否相等 //代码在core/ledger/kvledger/txmgmt/version/version.go ``` ## 7、Validator接口及实现(验证读写集) ### 7.1、Validator接口定义 ```go type Validator interface { //验证和准备批处理 ValidateAndPrepareBatch(block *common.Block, doMVCCValidation bool) (*statedb.UpdateBatch, error) } //代码在core/ledger/kvledger/txmgmt/validator/validator.go ``` ### 7.2、Validator接口实现 Validator接口实现,即statebasedval.Validator结构体及方法。Validator结构体定义如下: ```go type Validator struct { db statedb.VersionedDB //statedb } //代码在core/ledger/kvledger/txmgmt/validator/statebasedval/state_based_validator.go ``` 涉及方法如下: ```go //构造Validator func NewValidator(db statedb.VersionedDB) *Validator //验证背书交易 func (v *Validator) validateEndorserTX(envBytes []byte, doMVCCValidation bool, updates *statedb.UpdateBatch) (*rwsetutil.TxRwSet, peer.TxValidationCode, error) //验证和准备批处理,Block中写集加入批处理 func (v *Validator) ValidateAndPrepareBatch(block *common.Block, doMVCCValidation bool) (*statedb.UpdateBatch, error) func addWriteSetToBatch(txRWSet *rwsetutil.TxRwSet, txHeight *version.Height, batch *statedb.UpdateBatch) func (v *Validator) validateTx(txRWSet *rwsetutil.TxRwSet, updates *statedb.UpdateBatch) (peer.TxValidationCode, error) func (v *Validator) validateReadSet(ns string, kvReads []*kvrwset.KVRead, updates *statedb.UpdateBatch) (bool, error) func (v *Validator) validateKVRead(ns string, kvRead *kvrwset.KVRead, updates *statedb.UpdateBatch) (bool, error) func (v *Validator) validateRangeQueries(ns string, rangeQueriesInfo []*kvrwset.RangeQueryInfo, updates *statedb.UpdateBatch) (bool, error) func (v *Validator) validateRangeQuery(ns string, rangeQueryInfo *kvrwset.RangeQueryInfo, updates *statedb.UpdateBatch) (bool, error) //代码在core/ledger/kvledger/txmgmt/validator/statebasedval/state_based_validator.go ``` func (v *Validator) ValidateAndPrepareBatch(block *common.Block, doMVCCValidation bool) (*statedb.UpdateBatch, error)代码如下: ```go updates := statedb.NewUpdateBatch() //构造批处理 //type TxValidationFlags []uint8 txsFilter := util.TxValidationFlags(block.Metadata.Metadata[common.BlockMetadataIndex_TRANSACTIONS_FILTER]) if len(txsFilter) == 0 { txsFilter = util.NewTxValidationFlags(len(block.Data.Data)) block.Metadata.Metadata[common.BlockMetadataIndex_TRANSACTIONS_FILTER] = txsFilter } for txIndex, envBytes := range block.Data.Data { if txsFilter.IsInvalid(txIndex) { //验证交易是否有效 continue } env, err := putils.GetEnvelopeFromBlock(envBytes) //Envelope payload, err := putils.GetPayload(env) //Payload chdr, err := putils.UnmarshalChannelHeader(payload.Header.ChannelHeader) //ChannelHeader txType := common.HeaderType(chdr.Type) //HeaderType if txType != common.HeaderType_ENDORSER_TRANSACTION { continue } //验证背书交易,获取读写集 txRWSet, txResult, err := v.validateEndorserTX(envBytes, doMVCCValidation, updates) txsFilter.SetFlag(txIndex, txResult) if txRWSet != nil { committingTxHeight := version.NewHeight(block.Header.Number, uint64(txIndex)) //读写集中写集加入批处理 addWriteSetToBatch(txRWSet, committingTxHeight, updates) txsFilter.SetFlag(txIndex, peer.TxValidationCode_VALID) } } block.Metadata.Metadata[common.BlockMetadataIndex_TRANSACTIONS_FILTER] = txsFilter return updates, nil //代码在core/ledger/kvledger/txmgmt/validator/statebasedval/state_based_validator.go ``` ## 8、TxMgr接口及实现(交易管理) ### 8.1、TxMgr接口定义 ```go type TxMgr interface { NewQueryExecutor() (ledger.QueryExecutor, error) NewTxSimulator() (ledger.TxSimulator, error) ValidateAndPrepare(block *common.Block, doMVCCValidation bool) error //返回statedb一致的最高事务的高度 GetLastSavepoint() (*version.Height, error) ShouldRecover(lastAvailableBlock uint64) (bool, uint64, error) CommitLostBlock(block *common.Block) error Commit() error Rollback() Shutdown() } //代码在core/ledger/kvledger/txmgmt/txmgr/txmgr.go ``` ### 8.2、TxMgr接口实现 TxMgr接口实现,即LockBasedTxMgr结构体及方法。LockBasedTxMgr结构体如下: ```go type LockBasedTxMgr struct { db statedb.VersionedDB //statedb validator validator.Validator //Validator batch *statedb.UpdateBatch //批处理 currentBlock *common.Block //Block commitRWLock sync.RWMutex //锁 } //代码在core/ledger/kvledger/txmgmt/txmgr/lockbasedtxmgr/lockbased_txmgr.go ``` 涉及方法如下: ```go //构造LockBasedTxMgr func NewLockBasedTxMgr(db statedb.VersionedDB) *LockBasedTxMgr //调取txmgr.db.GetLatestSavePoint(),返回statedb一致的最高事务的高度 func (txmgr *LockBasedTxMgr) GetLastSavepoint() (*version.Height, error) //调取newQueryExecutor(txmgr) func (txmgr *LockBasedTxMgr) NewQueryExecutor() (ledger.QueryExecutor, error) func (txmgr *LockBasedTxMgr) NewTxSimulator() (ledger.TxSimulator, error) //验证Block,并从Block中获取写集加入批处理txmgr.batch func (txmgr *LockBasedTxMgr) ValidateAndPrepare(block *common.Block, doMVCCValidation bool) error func (txmgr *LockBasedTxMgr) Shutdown() //执行txmgr.batch, func (txmgr *LockBasedTxMgr) Commit() error func (txmgr *LockBasedTxMgr) Rollback() func (txmgr *LockBasedTxMgr) ShouldRecover(lastAvailableBlock uint64) (bool, uint64, error) func (txmgr *LockBasedTxMgr) CommitLostBlock(block *common.Block) error //代码在core/ledger/kvledger/txmgmt/txmgr/lockbasedtxmgr/lockbased_txmgr.go ``` ### 8.3、lockBasedQueryExecutor结构体及方法(实现ledger.QueryExecutor接口) ```go type lockBasedQueryExecutor struct { helper *queryHelper id string } func newQueryExecutor(txmgr *LockBasedTxMgr) *lockBasedQueryExecutor func (q *lockBasedQueryExecutor) GetState(ns string, key string) ([]byte, error) func (q *lockBasedQueryExecutor) GetStateMultipleKeys(namespace string, keys []string) ([][]byte, error) func (q *lockBasedQueryExecutor) GetStateRangeScanIterator(namespace string, startKey string, endKey string) (ledger.ResultsIterator, error) func (q *lockBasedQueryExecutor) ExecuteQuery(namespace, query string) (ledger.ResultsIterator, error) func (q *lockBasedQueryExecutor) Done() //代码在core/ledger/kvledger/txmgmt/txmgr/lockbasedtxmgr/lockbased_query_executer.go ``` ### 8.4、queryHelper结构体及方法 queryHelper结构体及方法: ```go type queryHelper struct { txmgr *LockBasedTxMgr //LockBasedTxMgr rwsetBuilder *rwsetutil.RWSetBuilder //读写集工具 itrs []*resultsItr err error doneInvoked bool //是否调用完成 } //statedb中获取versionedValue,并加入rwsetBuilder的nsRWs.readMap中 func (h *queryHelper) getState(ns string, key string) ([]byte, error) //statedb中获取多个versionedValue,并加入rwsetBuilder的nsRWs.readMap中 func (h *queryHelper) getStateMultipleKeys(namespace string, keys []string) ([][]byte, error) //构造resultsItr,并加入queryHelper.itrs func (h *queryHelper) getStateRangeScanIterator(namespace string, startKey string, endKey string) (commonledger.ResultsIterator, error) 执行查询并构造queryResultsItr func (h *queryHelper) executeQuery(namespace, query string) (commonledger.ResultsIterator, error) //done func (h *queryHelper) done() func (h *queryHelper) checkDone() //代码在core/ledger/kvledger/txmgmt/txmgr/lockbasedtxmgr/helper.go ``` resultsItr结构体及方法: ```go type resultsItr struct { ns string endKey string dbItr statedb.ResultsIterator rwSetBuilder *rwsetutil.RWSetBuilder rangeQueryInfo *kvrwset.RangeQueryInfo rangeQueryResultsHelper *rwsetutil.RangeQueryResultsHelper } func newResultsItr(ns string, startKey string, endKey string, db statedb.VersionedDB, rwsetBuilder *rwsetutil.RWSetBuilder, enableHashing bool, maxDegree uint32) (*resultsItr, error) func (itr *resultsItr) Next() (commonledger.QueryResult, error) func (itr *resultsItr) updateRangeQueryInfo(queryResult statedb.QueryResult) func (itr *resultsItr) Close() //代码在core/ledger/kvledger/txmgmt/txmgr/lockbasedtxmgr/helper.go 感谢关注兄弟连区块链教程分享! ```

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