58 lines
1.9 KiB
Go
58 lines
1.9 KiB
Go
/*
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Copyright IBM Corp. 2017 All Rights Reserved.
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SPDX-License-Identifier: Apache-2.0
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*/
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package genesis
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import (
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cb "github.com/hyperledger/fabric-protos-go/common"
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"github.com/hyperledger/fabric/protoutil"
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)
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const (
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msgVersion = int32(1)
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// These values are fixed for the genesis block.
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epoch = 0
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)
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// Factory facilitates the creation of genesis blocks.
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type Factory interface {
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// Block returns a genesis block for a given channel ID.
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Block(channelID string) *cb.Block
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}
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type factory struct {
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channelGroup *cb.ConfigGroup
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}
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// NewFactoryImpl creates a new Factory.
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func NewFactoryImpl(channelGroup *cb.ConfigGroup) Factory {
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return &factory{channelGroup: channelGroup}
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}
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// Block constructs and returns a genesis block for a given channel ID.
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func (f *factory) Block(channelID string) *cb.Block {
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payloadChannelHeader := protoutil.MakeChannelHeader(cb.HeaderType_CONFIG, msgVersion, channelID, epoch)
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payloadSignatureHeader := protoutil.MakeSignatureHeader(nil, protoutil.CreateNonceOrPanic())
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protoutil.SetTxID(payloadChannelHeader, payloadSignatureHeader)
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payloadHeader := protoutil.MakePayloadHeader(payloadChannelHeader, payloadSignatureHeader)
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payload := &cb.Payload{Header: payloadHeader, Data: protoutil.MarshalOrPanic(&cb.ConfigEnvelope{Config: &cb.Config{ChannelGroup: f.channelGroup}})}
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envelope := &cb.Envelope{Payload: protoutil.MarshalOrPanic(payload), Signature: nil}
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block := protoutil.NewBlock(0, nil)
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block.Data = &cb.BlockData{Data: [][]byte{protoutil.MarshalOrPanic(envelope)}}
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block.Header.DataHash = protoutil.BlockDataHash(block.Data)
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block.Metadata.Metadata[cb.BlockMetadataIndex_LAST_CONFIG] = protoutil.MarshalOrPanic(&cb.Metadata{
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Value: protoutil.MarshalOrPanic(&cb.LastConfig{Index: 0}),
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})
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block.Metadata.Metadata[cb.BlockMetadataIndex_SIGNATURES] = protoutil.MarshalOrPanic(&cb.Metadata{
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Value: protoutil.MarshalOrPanic(&cb.OrdererBlockMetadata{
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LastConfig: &cb.LastConfig{Index: 0},
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}),
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})
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return block
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}
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