github.com/adnan-c/fabric_e2e_couchdb@v0.6.1-preview.0.20170228180935-21ce6b23cf91/common/genesis/genesis.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 genesis
    18  
    19  import (
    20  	"github.com/golang/protobuf/proto"
    21  	"github.com/hyperledger/fabric/common/configtx"
    22  	cb "github.com/hyperledger/fabric/protos/common"
    23  	"github.com/hyperledger/fabric/protos/utils"
    24  )
    25  
    26  const (
    27  	msgVersion = int32(1)
    28  
    29  	// These values are fixed for the genesis block.
    30  	lastModified = 0
    31  	epoch        = 0
    32  )
    33  
    34  type Factory interface {
    35  	Block(chainID string) (*cb.Block, error)
    36  }
    37  
    38  type factory struct {
    39  	template configtx.Template
    40  }
    41  
    42  func NewFactoryImpl(template configtx.Template) Factory {
    43  	return &factory{template: template}
    44  }
    45  
    46  func (f *factory) Block(chainID string) (*cb.Block, error) {
    47  	configEnv, err := f.template.Envelope(chainID)
    48  	if err != nil {
    49  		return nil, err
    50  	}
    51  
    52  	configUpdate := &cb.ConfigUpdate{}
    53  	err = proto.Unmarshal(configEnv.ConfigUpdate, configUpdate)
    54  	if err != nil {
    55  		return nil, err
    56  	}
    57  
    58  	payloadChannelHeader := utils.MakeChannelHeader(cb.HeaderType_CONFIG, msgVersion, chainID, epoch)
    59  	payloadSignatureHeader := utils.MakeSignatureHeader(nil, utils.CreateNonceOrPanic())
    60  	payloadHeader := utils.MakePayloadHeader(payloadChannelHeader, payloadSignatureHeader)
    61  	payload := &cb.Payload{Header: payloadHeader, Data: utils.MarshalOrPanic(&cb.ConfigEnvelope{Config: &cb.Config{Header: configUpdate.Header, Channel: configUpdate.WriteSet}})}
    62  	envelope := &cb.Envelope{Payload: utils.MarshalOrPanic(payload), Signature: nil}
    63  
    64  	block := cb.NewBlock(0, nil)
    65  	block.Data = &cb.BlockData{Data: [][]byte{utils.MarshalOrPanic(envelope)}}
    66  	block.Header.DataHash = block.Data.Hash()
    67  	block.Metadata.Metadata[cb.BlockMetadataIndex_LAST_CONFIG] = utils.MarshalOrPanic(&cb.Metadata{
    68  		Value: utils.MarshalOrPanic(&cb.LastConfig{Index: 0}),
    69  	})
    70  	return block, nil
    71  }