github.com/kchristidis/fabric@v1.0.4-0.20171028114726-837acd08cde1/test/tools/LTE/chainmgmt/block_gen.go (about)

     1  /*
     2  Copyright IBM Corp. 2017 All Rights Reserved.
     3  
     4  Licensed under the Apache License, Version 2.0 (the "License");
     5  you may not use this file except in compliance with the License.
     6  You may obtain a copy of the License at
     7  
     8  		 http://www.apache.org/licenses/LICENSE-2.0
     9  
    10  Unless required by applicable law or agreed to in writing, software
    11  distributed under the License is distributed on an "AS IS" BASIS,
    12  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    13  See the License for the specific language governing permissions and
    14  limitations under the License.
    15  */
    16  
    17  package chainmgmt
    18  
    19  import (
    20  	"sync"
    21  
    22  	"github.com/golang/protobuf/proto"
    23  	"github.com/hyperledger/fabric/protos/common"
    24  	benchcommon "github.com/hyperledger/fabric/test/tools/LTE/common"
    25  )
    26  
    27  const (
    28  	numConcurrentTxEnvCreators = 30
    29  )
    30  
    31  type txEnvBytes []byte
    32  
    33  // blkGenerator generates blocks in sequence. One instance of blkGenerator is maintained for each chain
    34  type blkGenerator struct {
    35  	batchConf         *BatchConf
    36  	blockNum          uint64
    37  	previousBlockHash []byte
    38  
    39  	srQueue chan SimulationResult
    40  	txQueue chan txEnvBytes
    41  	wg      *sync.WaitGroup
    42  }
    43  
    44  func newBlkGenerator(batchConf *BatchConf, startingBlockNum uint64, previousBlockHash []byte) *blkGenerator {
    45  	bg := &blkGenerator{
    46  		batchConf,
    47  		startingBlockNum,
    48  		previousBlockHash,
    49  		make(chan SimulationResult, batchConf.BatchSize),
    50  		make(chan txEnvBytes, batchConf.BatchSize),
    51  		&sync.WaitGroup{},
    52  	}
    53  	bg.startTxEnvCreators()
    54  	return bg
    55  }
    56  
    57  func (bg *blkGenerator) startTxEnvCreators() {
    58  	for i := 0; i < numConcurrentTxEnvCreators; i++ {
    59  		go bg.startTxEnvCreator()
    60  	}
    61  }
    62  
    63  func (bg *blkGenerator) startTxEnvCreator() {
    64  	bg.wg.Add(1)
    65  	for sr := range bg.srQueue {
    66  		txEnv, err := createTxEnv(sr)
    67  		benchcommon.PanicOnError(err)
    68  		txEnvBytes, err := proto.Marshal(txEnv)
    69  		benchcommon.PanicOnError(err)
    70  		bg.txQueue <- txEnvBytes
    71  	}
    72  	bg.wg.Done()
    73  }
    74  
    75  func (bg *blkGenerator) addTx(sr SimulationResult) {
    76  	bg.srQueue <- sr
    77  }
    78  
    79  func (bg *blkGenerator) nextBlock() *common.Block {
    80  	block := common.NewBlock(bg.blockNum, bg.previousBlockHash)
    81  	numTx := 0
    82  	for txEnvBytes := range bg.txQueue {
    83  		numTx++
    84  		block.Data.Data = append(block.Data.Data, txEnvBytes)
    85  		if numTx == bg.batchConf.BatchSize {
    86  			break
    87  		}
    88  	}
    89  	// close() has been called and no pending tx
    90  	if len(block.Data.Data) == 0 {
    91  		return nil
    92  	}
    93  	block.Header.DataHash = block.Data.Hash()
    94  	block.Header.Number = bg.blockNum
    95  	block.Header.PreviousHash = bg.previousBlockHash
    96  
    97  	bg.blockNum++
    98  	bg.previousBlockHash = block.Header.Hash()
    99  	return block
   100  }
   101  
   102  func (bg *blkGenerator) close() {
   103  	close(bg.srQueue)
   104  	bg.wg.Wait()
   105  	close(bg.txQueue)
   106  }