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 }