github.com/tenywen/fabric@v1.0.0-beta.0.20170620030522-a5b1ed380643/core/ledger/kvledger/example/consenter.go (about)

     1  /*
     2  Copyright IBM Corp. 2016 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 example
    18  
    19  import (
    20  	"github.com/golang/protobuf/proto"
    21  
    22  	"github.com/hyperledger/fabric/protos/common"
    23  )
    24  
    25  // Consenter - a toy Consenter
    26  type Consenter struct {
    27  	blockNum     uint64
    28  	previousHash []byte
    29  }
    30  
    31  // ConstructConsenter constructs a consenter for example
    32  func ConstructConsenter() *Consenter {
    33  	return &Consenter{1, []byte{}}
    34  }
    35  
    36  // ConstructBlock constructs a block from a list of transactions
    37  func (c *Consenter) ConstructBlock(transactions ...*common.Envelope) *common.Block {
    38  	logger.Debugf("Construct a block based on the transactions")
    39  	block := common.NewBlock(c.blockNum, c.previousHash)
    40  	for _, tx := range transactions {
    41  		txEnvBytes, _ := proto.Marshal(tx)
    42  		block.Data.Data = append(block.Data.Data, txEnvBytes)
    43  	}
    44  	block.Header.DataHash = block.Data.Hash()
    45  	c.blockNum++
    46  	c.previousHash = block.Header.Hash()
    47  	return block
    48  }