type bootstrapper struct {
????channelGroups     []*cb.ConfigGroup
????ordererGroups     []*cb.ConfigGroup
????applicationGroups []*cb.ConfigGroup
????consortiumsGroups []*cb.ConfigGroup
}

func New(conf *genesisconfig.Profile) Generator
func (bs *bootstrapper) ChannelTemplate() configtx.Template
func (bs *bootstrapper) GenesisBlock() *cb.Block
func (bs *bootstrapper) GenesisBlockForChannel(channelID string) *cb.Block
//代碼在common/configtx/tool/provisional/provisional.go
 

func New(conf *genesisconfig.Profile) Generator代碼如下：

func New(conf *genesisconfig.Profile) Generator {
????bs := &bootstrapper{
????????channelGroups: []*cb.ConfigGroup{
????????????config.DefaultHashingAlgorithm(), //默認哈希函數
????????????config.DefaultBlockDataHashingStructure(), //默認塊數據哈希結構
????????????
????????????//默認通道策略，包括讀策略、寫策略和管理策略
????????????//ReadersPolicyKey = "Readers"，ImplicitMetaPolicy_ANY，任意
????????????policies.TemplateImplicitMetaAnyPolicy([]string{}, configvaluesmsp.ReadersPolicyKey),
????????????//WritersPolicyKey = "Writers"，ImplicitMetaPolicy_ANY，任意
????????????policies.TemplateImplicitMetaAnyPolicy([]string{}, configvaluesmsp.WritersPolicyKey),
????????????//AdminsPolicyKey = "Admins"，ImplicitMetaPolicy_MAJORITY，大多數
????????????policies.TemplateImplicitMetaMajorityPolicy([]string{}, configvaluesmsp.AdminsPolicyKey),
????????},
????}

????if conf.Orderer != nil { //系統通道配置
????????oa := config.TemplateOrdererAddresses(conf.Orderer.Addresses) //設置Orderer地址
????????oa.Values[config.OrdererAddressesKey].ModPolicy = OrdererAdminsPolicy //OrdererAdminsPolicy = "/Channel/Orderer/Admins"

????????bs.ordererGroups = []*cb.ConfigGroup{
????????????oa,
????????????config.TemplateConsensusType(conf.Orderer.OrdererType), //設置共識插件類型
????????????config.TemplateBatchSize(&ab.BatchSize{ //設置批處理大小
????????????????MaxMessageCount:   conf.Orderer.BatchSize.MaxMessageCount,
????????????????AbsoluteMaxBytes:  conf.Orderer.BatchSize.AbsoluteMaxBytes,
????????????????PreferredMaxBytes: conf.Orderer.BatchSize.PreferredMaxBytes,
????????????}),
????????????config.TemplateBatchTimeout(conf.Orderer.BatchTimeout.String()), //設置批處理超時
????????????config.TemplateChannelRestrictions(conf.Orderer.MaxChannels), //設置最大通道數

????????????//初始化Orderer讀、寫、管理策略
????????????policies.TemplateImplicitMetaPolicyWithSubPolicy([]string{config.OrdererGroupKey}, BlockValidationPolicyKey, configvaluesmsp.WritersPolicyKey, cb.ImplicitMetaPolicy_ANY),
????????????policies.TemplateImplicitMetaAnyPolicy([]string{config.OrdererGroupKey}, configvaluesmsp.ReadersPolicyKey),
????????????policies.TemplateImplicitMetaAnyPolicy([]string{config.OrdererGroupKey}, configvaluesmsp.WritersPolicyKey),
????????????policies.TemplateImplicitMetaMajorityPolicy([]string{config.OrdererGroupKey}, configvaluesmsp.AdminsPolicyKey),
????????}

????????for _, org := range conf.Orderer.Organizations {
????????????mspConfig, err := msp.GetVerifyingMspConfig(org.MSPDir, org.ID)
????????????bs.ordererGroups = append(bs.ordererGroups,
????????????????configvaluesmsp.TemplateGroupMSPWithAdminRolePrincipal([]string{config.OrdererGroupKey, org.Name},
????????????????????mspConfig, org.AdminPrincipal == genesisconfig.AdminRoleAdminPrincipal,
????????????????),
????????????)
????????}

????????switch conf.Orderer.OrdererType {
????????case ConsensusTypeSolo:
????????case ConsensusTypeKafka:
????????????bs.ordererGroups = append(bs.ordererGroups, config.TemplateKafkaBrokers(conf.Orderer.Kafka.Brokers)) //設置Kafka
????????default:
????????}
????}

????if conf.Application != nil { //應用通道配置
????????bs.applicationGroups = []*cb.ConfigGroup{
????????????policies.TemplateImplicitMetaAnyPolicy([]string{config.ApplicationGroupKey}, configvaluesmsp.ReadersPolicyKey),
????????????policies.TemplateImplicitMetaAnyPolicy([]string{config.ApplicationGroupKey}, configvaluesmsp.WritersPolicyKey),
????????????policies.TemplateImplicitMetaMajorityPolicy([]string{config.ApplicationGroupKey}, configvaluesmsp.AdminsPolicyKey),
????????}
????????for _, org := range conf.Application.Organizations {
????????????mspConfig, err := msp.GetVerifyingMspConfig(org.MSPDir, org.ID)
????????????bs.applicationGroups = append(bs.applicationGroups,
????????????????configvaluesmsp.TemplateGroupMSPWithAdminRolePrincipal([]string{config.ApplicationGroupKey, org.Name},
????????????????????mspConfig, org.AdminPrincipal == genesisconfig.AdminRoleAdminPrincipal,
????????????????),
????????????)
????????????var anchorProtos []*pb.AnchorPeer
????????????for _, anchorPeer := range org.AnchorPeers {
????????????????anchorProtos = append(anchorProtos, &pb.AnchorPeer{
????????????????????Host: anchorPeer.Host,
????????????????????Port: int32(anchorPeer.Port),
????????????????})
????????????}
????????????bs.applicationGroups = append(bs.applicationGroups, config.TemplateAnchorPeers(org.Name, anchorProtos))
????????}

????}

????if conf.Consortiums != nil { //聯盟相關
????????tcg := config.TemplateConsortiumsGroup()
????????tcg.Groups[config.ConsortiumsGroupKey].ModPolicy = OrdererAdminsPolicy
????????tcg.Groups[config.ConsortiumsGroupKey].Policies[configvaluesmsp.AdminsPolicyKey] = &cb.ConfigPolicy{
????????????Policy: &cb.Policy{
????????????????Type:  int32(cb.Policy_SIGNATURE),
????????????????Value: utils.MarshalOrPanic(cauthdsl.AcceptAllPolicy),
????????????},
????????????ModPolicy: OrdererAdminsPolicy,
????????}
????????bs.consortiumsGroups = append(bs.consortiumsGroups, tcg)
????????for consortiumName, consortium := range conf.Consortiums {
????????????cg := config.TemplateConsortiumChannelCreationPolicy(consortiumName, policies.ImplicitMetaPolicyWithSubPolicy(
????????????????configvaluesmsp.AdminsPolicyKey,
????????????????cb.ImplicitMetaPolicy_ANY,
????????????).Policy)

????????????cg.Groups[config.ConsortiumsGroupKey].Groups[consortiumName].ModPolicy = OrdererAdminsPolicy
????????????cg.Groups[config.ConsortiumsGroupKey].Groups[consortiumName].Values[config.ChannelCreationPolicyKey].ModPolicy = OrdererAdminsPolicy
????????????bs.consortiumsGroups = append(bs.consortiumsGroups, cg)

????????????for _, org := range consortium.Organizations {
????????????????mspConfig, err := msp.GetVerifyingMspConfig(org.MSPDir, org.ID)
????????????????bs.consortiumsGroups = append(bs.consortiumsGroups,
????????????????????configvaluesmsp.TemplateGroupMSPWithAdminRolePrincipal(
????????????????????????[]string{config.ConsortiumsGroupKey, consortiumName, org.Name},
????????????????????????mspConfig, org.AdminPrincipal == genesisconfig.AdminRoleAdminPrincipal,
????????????????????),
????????????????)
????????????}
????????}
????}

????return bs
}
//代碼在common/configtx/tool/provisional/provisional.go
 

func (bs bootstrapper) GenesisBlockForChannel(channelID string) cb.Block代碼如下：

func (bs *bootstrapper) GenesisBlockForChannel(channelID string) *cb.Block {
????block, err := genesis.NewFactoryImpl(
????????configtx.NewModPolicySettingTemplate(
????????????configvaluesmsp.AdminsPolicyKey,
????????????configtx.NewCompositeTemplate(
????????????????configtx.NewSimpleTemplate(bs.consortiumsGroups...),
????????????????bs.ChannelTemplate(),
????????????),
????????),
????).Block(channelID)
????return block
}

//代碼在common/configtx/tool/provisional/provisional.go
 

5、configtxgen命令

5.1、main函數

func main() {
????var outputBlock, outputChannelCreateTx, profile, channelID, inspectBlock, inspectChannelCreateTx, outputAnchorPeersUpdate, asOrg string

????//-outputBlock，初始區塊寫入指定文件
????flag.StringVar(&outputBlock, "outputBlock", "", "The path to write the genesis block to (if set)")
????//-channelID，指定通道名稱
????flag.StringVar(&channelID, "channelID", provisional.TestChainID, "The channel ID to use in the configtx")
????//-outputCreateChannelTx，將通道創建交易寫入指定文件
????flag.StringVar(&outputChannelCreateTx, "outputCreateChannelTx", "", "The path to write a channel creation configtx to (if set)")
????//-profile，指定profile
????flag.StringVar(&profile, "profile", genesisconfig.SampleInsecureProfile, "The profile from configtx.yaml to use for generation.")
????//-inspectBlock，打印指定區塊的配置信息
????flag.StringVar(&inspectBlock, "inspectBlock", "", "Prints the configuration contained in the block at the specified path")
????//-inspectChannelCreateTx，打印通道創建交易文件中的配置更新信息
????flag.StringVar(&inspectChannelCreateTx, "inspectChannelCreateTx", "", "Prints the configuration contained in the transaction at the specified path")
????//-outputAnchorPeersUpdate，生成錨節點配置更新文件，需同時指定-asOrg
????flag.StringVar(&outputAnchorPeersUpdate, "outputAnchorPeersUpdate", "", "Creates an config update to update an anchor peer (works only with the default channel creation, and only for the first update)")
????//-asOrg，以指定身份執行更新配置交易，如更新錨節點配置信息
????flag.StringVar(&asOrg, "asOrg", "", "Performs the config generation as a particular organization (by name), only including values in the write set that org (likely) has privilege to set")
????flag.Parse()

????factory.InitFactories(nil)
????config := genesisconfig.Load(profile) //讀取指定配置

????if outputBlock != "" { //生成Orderer服務啟動的初始區塊
????????err := doOutputBlock(config, channelID, outputBlock)
????}
????if outputChannelCreateTx != "" { //生成新建應用通道的配置交易
????????err := doOutputChannelCreateTx(config, channelID, outputChannelCreateTx)
????}
????if outputAnchorPeersUpdate != "" { //生成錨節點配置更新文件
????????err := doOutputAnchorPeersUpdate(config, channelID, outputAnchorPeersUpdate, asOrg)
????}
}
//代碼在common/configtx/tool/configtxgen/main.go

5.2、doOutputBlock（生成Orderer服務啟動的初始區塊，即系統通道的初始區塊文件）

func doOutputBlock(config *genesisconfig.Profile, channelID string, outputBlock string) error {
????pgen := provisional.New(config) //構建Generator實例
????genesisBlock := pgen.GenesisBlockForChannel(channelID) //生成創世區塊
????err := ioutil.WriteFile(outputBlock, utils.MarshalOrPanic(genesisBlock), 0644) //創世區塊寫入文件
????return nil
}
//代碼在common/configtx/tool/configtxgen/main.go

genesis更詳細內容，參考：Fabric 1.0源代碼筆記 之 configtx（配置交易） #genesis（系統通道創世區塊）

5.3、doOutputChannelCreateTx（生成新建應用通道的配置交易）

func doOutputChannelCreateTx(conf *genesisconfig.Profile, channelID string, outputChannelCreateTx string) error {
????var orgNames []string
????for _, org := range conf.Application.Organizations {
????????orgNames = append(orgNames, org.Name)
????}
????configtx, err := configtx.MakeChainCreationTransaction(channelID, conf.Consortium, nil, orgNames...)
????err = ioutil.WriteFile(outputChannelCreateTx, utils.MarshalOrPanic(configtx), 0644)
????return nil
}
//代碼在common/configtx/tool/configtxgen/main.go

5.4、doOutputAnchorPeersUpdate（生成錨節點配置更新文件）

func doOutputAnchorPeersUpdate(conf *genesisconfig.Profile, channelID string, outputAnchorPeersUpdate string, asOrg string) error {
????var org *genesisconfig.Organization
????for _, iorg := range conf.Application.Organizations {
????????if iorg.Name == asOrg {
????????????org = iorg
????????}
????}
????anchorPeers := make([]*pb.AnchorPeer, len(org.AnchorPeers))
????for i, anchorPeer := range org.AnchorPeers {
????????anchorPeers[i] = &pb.AnchorPeer{
????????????Host: anchorPeer.Host,
????????????Port: int32(anchorPeer.Port),
????????}
????}

????configGroup := config.TemplateAnchorPeers(org.Name, anchorPeers)
????configGroup.Groups[config.ApplicationGroupKey].Groups[org.Name].Values[config.AnchorPeersKey].ModPolicy = mspconfig.AdminsPolicyKey
????configUpdate := &cb.ConfigUpdate{
????????ChannelId: channelID,
????????WriteSet:  configGroup,
????????ReadSet:   cb.NewConfigGroup(),
????}

????configUpdate.ReadSet.Groups[config.ApplicationGroupKey] = cb.NewConfigGroup()
????configUpdate.ReadSet.Groups[config.ApplicationGroupKey].Version = 1
????configUpdate.ReadSet.Groups[config.ApplicationGroupKey].ModPolicy = mspconfig.AdminsPolicyKey
????configUpdate.ReadSet.Groups[config.ApplicationGroupKey].Groups[org.Name] = cb.NewConfigGroup()
????configUpdate.ReadSet.Groups[config.ApplicationGroupKey].Groups[org.Name].Values[config.MSPKey] = &cb.ConfigValue{}
????configUpdate.ReadSet.Groups[config.ApplicationGroupKey].Groups[org.Name].Policies[mspconfig.ReadersPolicyKey] = &cb.ConfigPolicy{}
????configUpdate.ReadSet.Groups[config.ApplicationGroupKey].Groups[org.Name].Policies[mspconfig.WritersPolicyKey] = &cb.ConfigPolicy{}
????configUpdate.ReadSet.Groups[config.ApplicationGroupKey].Groups[org.Name].Policies[mspconfig.AdminsPolicyKey] = &cb.ConfigPolicy{}

????configUpdate.WriteSet.Groups[config.ApplicationGroupKey].Version = 1
????configUpdate.WriteSet.Groups[config.ApplicationGroupKey].ModPolicy = mspconfig.AdminsPolicyKey
????configUpdate.WriteSet.Groups[config.ApplicationGroupKey].Groups[org.Name].Version = 1
????configUpdate.WriteSet.Groups[config.ApplicationGroupKey].Groups[org.Name].ModPolicy = mspconfig.AdminsPolicyKey
????configUpdate.WriteSet.Groups[config.ApplicationGroupKey].Groups[org.Name].Values[config.MSPKey] = &cb.ConfigValue{}
????configUpdate.WriteSet.Groups[config.ApplicationGroupKey].Groups[org.Name].Policies[mspconfig.ReadersPolicyKey] = &cb.ConfigPolicy{}
????configUpdate.WriteSet.Groups[config.ApplicationGroupKey].Groups[org.Name].Policies[mspconfig.WritersPolicyKey] = &cb.ConfigPolicy{}
????configUpdate.WriteSet.Groups[config.ApplicationGroupKey].Groups[org.Name].Policies[mspconfig.AdminsPolicyKey] = &cb.ConfigPolicy{}

????configUpdateEnvelope := &cb.ConfigUpdateEnvelope{
????????ConfigUpdate: utils.MarshalOrPanic(configUpdate),
????}

????update := &cb.Envelope{
????????Payload: utils.MarshalOrPanic(&cb.Payload{
????????????Header: &cb.Header{
????????????????ChannelHeader: utils.MarshalOrPanic(&cb.ChannelHeader{
????????????????????ChannelId: channelID,
????????????????????Type:      int32(cb.HeaderType_CONFIG_UPDATE),
????????????????}),
????????????},
????????????Data: utils.MarshalOrPanic(configUpdateEnvelope),
????????}),
????}

????err := ioutil.WriteFile(outputAnchorPeersUpdate, utils.MarshalOrPanic(update), 0644)
????return nil
}

//代碼在common/configtx/tool/configtxgen/main.go

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