Hyperledger Fabric继peer启动之后的源码解析一

对图中peer节点启动之后的peer address 172.17.0.3:7051灰色部分的的代码提取分析，7051：peer gRPC 服务监听端口。下面是Hyperledger中相关监听的服务端口

默认包括：以下监听的服务端口对应hyperledger0.6版本，与其他版本无关。

7050: REST 服务端口

7051：peer gRPC 服务监听端口

7052：peer CLI 端口

7053：peer 事件服务端口

7054：eCAP7055：eCAA

7056：tCAP

7057：tCAA

7058：tlsCAP

7059：tlsCAA

图中的CacheConfiguration()这个函数到底做了什么？请看下面

// CacheConfiguration计算和缓存经常使用的常量且计算常量做为包变量，按照惯例前面的全局变量

// 已经被嵌入在这里为了保留原始的抽象状态

func CacheConfiguration() (err error) {

    // getLocalAddress 返回正在操作的本地peer的address:port，受到env:peer.addressAutoDetect的影响

    getLocalAddress := func() (peerAddress string, err error) {

        if viper.GetBool("peer.addressAutoDetect") {

            // 需要从peer.address设置中获取端口号，并将其添加到已经确定的主机ip后

            _, port, err := net.SplitHostPort(viper.GetString("peer.address"))

            if err != nil {

                err = fmt.Errorf("Error auto detecting Peer's address: %s", err)

                return "", err

            }

            peerAddress = net.JoinHostPort(GetLocalIP(), port)

            peerLogger.Infof("Auto detected peer address: %s", peerAddress)

        } else {

            peerAddress = viper.GetString("peer.address")

        }

        return

    }

    // getPeerEndpoint 对于这个Peer实例来说，返回PeerEndpoint，受到env:peer.addressAutoDetect的影响

    getPeerEndpoint := func() (*pb.PeerEndpoint, error) {

        var peerAddress string

        var peerType pb.PeerEndpoint_Type

        peerAddress, err := getLocalAddress()

        if err != nil {

            return nil, err

        }

        if viper.GetBool("peer.validator.enabled") {

            peerType = pb.PeerEndpoint_VALIDATOR

        } else {

            peerType = pb.PeerEndpoint_NON_VALIDATOR

        }

        return &pb.PeerEndpoint{ID: &pb.PeerID{Name: viper.GetString("peer.id")}, Address: peerAddress, Type: peerType}, nil

    }

    localAddress, localAddressError = getLocalAddress()

    peerEndpoint, peerEndpointError = getPeerEndpoint()

    syncStateSnapshotChannelSize = viper.GetInt("peer.sync.state.snapshot.channelSize")

    syncStateDeltasChannelSize = viper.GetInt("peer.sync.state.deltas.channelSize")

    syncBlocksChannelSize = viper.GetInt("peer.sync.blocks.channelSize")

    validatorEnabled = viper.GetBool("peer.validator.enabled")

    securityEnabled = viper.GetBool("security.enabled")

    configurationCached = true

    if localAddressError != nil {

        return localAddressError

    } else if peerEndpointError != nil {

        return peerEndpointError

    }

    return

}

// cacheConfiguration如果检查失败打一个错误日志

func cacheConfiguration() {

    if err := CacheConfiguration(); err != nil {

        peerLogger.Errorf("Execution continues after CacheConfiguration() failure : %s", err)

    }

}
// GetPeerEndpoint 从缓存配置中返回peerEndpoint
func GetPeerEndpoint() (*pb.PeerEndpoint, error) {
    if !configurationCached {
        cacheConfiguration()
    }
    return peerEndpoint, peerEndpointError
}

// cacheConfiguration如果检查失败打一个错误日志

func cacheConfiguration() {

    if err := CacheConfiguration(); err != nil {

        peerLogger.Errorf("Execution continues after CacheConfiguration() failure : %s", err)

    }