引用：https://blog.csdn.net/qq_40185499/article/details/104023543
一、基本环境
Ubuntu 18.04
vim、git
docker 19.03.5
docker-compose 1.25.0
Golang1.13.5
Fabric-go-sdk f7ae259
前边的过程中上边的环境都安装好了，就差Fabric-go-sdk，下边就简单说一下与sdk相关的安装：
cd $GOPATH/src/github.com/hyperledger
git clone https://github.com/hyperledger/fabric-sdk-go.git
git reset --hard f7ae259 #切换到同一版本的commit下
git log
截图：
二、网络环境
2.1、网络环境准备
Hyperledger Fabric 处理交易时需要大量的证书来确保在整个端到端流程（TSL，身份验证，签名块…）期间进行加密。我们的核心问题是构建chaincode从而搭建基于Fabric的应用，因此对这些我们采取网上开源的或者直接应用示例文件的，有时间的话再研究这个。 主要内容就是在前期cryptogen和configtxhen工具的辅助和配置文件的内容下生成genesis.block channel.tx 以及各种信息如下图，这里不进行重点讲解。
2.2、配置docker-compose.yml文件
在 fixtures 目录下创建一个 docker-compose.yml 文件并编辑
$ vim docker-compose.yml
1
将 network下的basic 修改为 default
version: '2'
networks:
default:
services:
编辑 orderer 部分
orderer.kevin.kongyixueyuan.com:
image: hyperledger/fabric-orderer
container_name: orderer.kevin.kongyixueyuan.com
environment:
- ORDERER_GENERAL_LOGLEVEL=debug
- ORDERER_GENERAL_LISTENADDRESS=0.0.0.0
- ORDERER_GENERAL_LISTENPORT=7050
- ORDERER_GENERAL_GENESISPROFILE=kongyixueyuan
- ORDERER_GENERAL_GENESISMETHOD=file
- ORDERER_GENERAL_GENESISFILE=/var/hyperledger/orderer/genesis.block
- ORDERER_GENERAL_LOCALMSPID=kevin.kongyixueyuan.com
- ORDERER_GENERAL_LOCALMSPDIR=/var/hyperledger/orderer/msp
- ORDERER_GENERAL_TLS_ENABLED=true
- ORDERER_GENERAL_TLS_PRIVATEKEY=/var/hyperledger/orderer/tls/server.key
- ORDERER_GENERAL_TLS_CERTIFICATE=/var/hyperledger/orderer/tls/server.crt
- ORDERER_GENERAL_TLS_ROOTCAS=[/var/hyperledger/orderer/tls/ca.crt]
working_dir: /opt/gopath/src/github.com/hyperledger/fabric
command: orderer
volumes:
- ./artifacts/genesis.block:/var/hyperledger/orderer/genesis.block
- ./crypto-config/ordererOrganizations/kevin.kongyixueyuan.com/orderers/orderer.kevin.kongyixueyuan.com/msp:/var/hyperledger/orderer/msp
- ./crypto-config/ordererOrganizations/kevin.kongyixueyuan.com/orderers/orderer.kevin.kongyixueyuan.com/tls:/var/hyperledger/orderer/tls
ports:
- 7050:7050
networks:
default:
aliases:
- orderer.kevin.kongyixueyuan.com
编辑 ca 部分
ca.org1.kevin.kongyixueyuan.com:
image: hyperledger/fabric-ca
container_name: ca.org1.kevin.kongyixueyuan.com
environment:
- FABRIC_CA_HOME=/etc/hyperledger/fabric-ca-server
- FABRIC_CA_SERVER_CA_NAME=ca.org1.kevin.kongyixueyuan.com
- FABRIC_CA_SERVER_CA_CERTFILE=/etc/hyperledger/fabric-ca-server-config/ca.org1.kevin.kongyixueyuan.com-cert.pem
- FABRIC_CA_SERVER_CA_KEYFILE=/etc/hyperledger/fabric-ca-server-config/727e69ed4a01a204cd53bf4a97c2c1cb947419504f82851f6ae563c3c96dea3a_sk
- FABRIC_CA_SERVER_TLS_ENABLED=true
- FABRIC_CA_SERVER_TLS_CERTFILE=/etc/hyperledger/fabric-ca-server-config/ca.org1.kevin.kongyixueyuan.com-cert.pem
- FABRIC_CA_SERVER_TLS_KEYFILE=/etc/hyperledger/fabric-ca-server-config/727e69ed4a01a204cd53bf4a97c2c1cb947419504f82851f6ae563c3c96dea3a_sk
ports:
- 7054:7054
command: sh -c 'fabric-ca-server start -b admin:adminpw -d'
volumes:
- ./crypto-config/peerOrganizations/org1.kevin.kongyixueyuan.com/ca/:/etc/hyperledger/fabric-ca-server-config
networks:
default:
aliases:
- ca.org1.kevin.kongyixueyuan.com
编辑Peer部分
peer0.org1.example.com 内容如下
peer0.org1.kevin.kongyixueyuan.com:
image: hyperledger/fabric-peer
container_name: peer0.org1.kevin.kongyixueyuan.com
environment:
- CORE_VM_ENDPOINT=unix:///host/var/run/docker.sock
- CORE_VM_DOCKER_ATTACHSTDOUT=true
- CORE_LOGGING_LEVEL=DEBUG
- CORE_PEER_NETWORKID=kongyixueyuan
- CORE_PEER_PROFILE_ENABLED=true
- CORE_PEER_TLS_ENABLED=true
- CORE_PEER_TLS_CERT_FILE=/var/hyperledger/tls/server.crt
- CORE_PEER_TLS_KEY_FILE=/var/hyperledger/tls/server.key
- CORE_PEER_TLS_ROOTCERT_FILE=/var/hyperledger/tls/ca.crt
- CORE_PEER_ID=peer0.org1.kevin.kongyixueyuan.com
- CORE_PEER_ADDRESSAUTODETECT=true
- CORE_PEER_ADDRESS=peer0.org1.kevin.kongyixueyuan.com:7051
- CORE_PEER_GOSSIP_EXTERNALENDPOINT=peer0.org1.kevin.kongyixueyuan.com:7051
- CORE_PEER_GOSSIP_USELEADERELECTION=true
- CORE_PEER_GOSSIP_ORGLEADER=false
- CORE_PEER_GOSSIP_SKIPHANDSHAKE=true
- CORE_PEER_LOCALMSPID=org1.kevin.kongyixueyuan.com
- CORE_PEER_MSPCONFIGPATH=/var/hyperledger/msp
- CORE_PEER_TLS_SERVERHOSTOVERRIDE=peer0.org1.kevin.kongyixueyuan.com
working_dir: /opt/gopath/src/github.com/hyperledger/fabric/peer
command: peer node start
volumes:
- /var/run/:/host/var/run/
- ./crypto-config/peerOrganizations/org1.kevin.kongyixueyuan.com/peers/peer0.org1.kevin.kongyixueyuan.com/msp:/var/hyperledger/msp
- ./crypto-config/peerOrganizations/org1.kevin.kongyixueyuan.com/peers/peer0.org1.kevin.kongyixueyuan.com/tls:/var/hyperledger/tls
ports:
- 7051:7051
- 7053:7053
depends_on:
- orderer.kevin.kongyixueyuan.com
networks:
default:
aliases:
- peer0.org1.kevin.kongyixueyuan.com
peer1.org1.example.com 内容如下
peer1.org1.kevin.kongyixueyuan.com:
image: hyperledger/fabric-peer
container_name: peer1.org1.kevin.kongyixueyuan.com
environment:
- CORE_VM_ENDPOINT=unix:///host/var/run/docker.sock
- CORE_VM_DOCKER_ATTACHSTDOUT=true
- CORE_LOGGING_LEVEL=DEBUG
- CORE_PEER_NETWORKID=kongyixueyuan
- CORE_PEER_PROFILE_ENABLED=true
- CORE_PEER_TLS_ENABLED=true
- CORE_PEER_TLS_CERT_FILE=/var/hyperledger/tls/server.crt
- CORE_PEER_TLS_KEY_FILE=/var/hyperledger/tls/server.key
- CORE_PEER_TLS_ROOTCERT_FILE=/var/hyperledger/tls/ca.crt
- CORE_PEER_ID=peer1.org1.kevin.kongyixueyuan.com
- CORE_PEER_ADDRESSAUTODETECT=true
- CORE_PEER_ADDRESS=peer1.org1.kevin.kongyixueyuan.com:7051
- CORE_PEER_GOSSIP_EXTERNALENDPOINT=peer1.org1.kevin.kongyixueyuan.com:7051
- CORE_PEER_GOSSIP_USELEADERELECTION=true
- CORE_PEER_GOSSIP_ORGLEADER=false
- CORE_PEER_GOSSIP_SKIPHANDSHAKE=true
- CORE_PEER_LOCALMSPID=org1.kevin.kongyixueyuan.com
- CORE_PEER_MSPCONFIGPATH=/var/hyperledger/msp
- CORE_PEER_TLS_SERVERHOSTOVERRIDE=peer1.org1.kevin.kongyixueyuan.com
working_dir: /opt/gopath/src/github.com/hyperledger/fabric/peer
command: peer node start
volumes:
- /var/run/:/host/var/run/
- ./crypto-config/peerOrganizations/org1.kevin.kongyixueyuan.com/peers/peer1.org1.kevin.kongyixueyuan.com/msp:/var/hyperledger/msp
- ./crypto-config/peerOrganizations/org1.kevin.kongyixueyuan.com/peers/peer1.org1.kevin.kongyixueyuan.com/tls:/var/hyperledger/tls
ports:
- 7151:7051
- 7153:7053
depends_on:
- orderer.kevin.kongyixueyuan.com
networks:
default:
aliases:
- peer1.org1.kevin.kongyixueyuan.com
其余可根据实际情况进行添加
2.3、测试网络环境
为了检查网络是否正常工作，使用docker-compose同时启动或停止所有容器。 进入fixtures文件夹，运行：
docker-compose up
如果在您的系统中没有相关的容器，那么会自动下载docker镜像。下载完毕后自动启动，控制台会输出很多不同颜色的日志（红色不等于错误）
打开一个新终端并运行：
$ docker ps -a
将看到：两个peer，一个orderer和一个CA容器。 代表已成功创建了一个新的网络，可以随SDK一起使用。 要停止网络，请返回到上一个终端，按Ctrl-C并等待所有容器都停止。
最后在终端2中执行如下命令关闭网络：
docker-compose down
三、 配置Fabric-SDK
3.1、创建config.yaml
确认 Hyperledger Fabric 基础网络环境运行没有问题后，现在我们通过创建一个新的 config.yaml 配置文件给应用程序所使用的 Fabric-SDK-Go 配置相关参数及 Fabric 组件的通信地址
进入项目的根目录中创建一个 config.yaml 文件并编辑
$ cd $GOPATH/src/github.com/kongyixueyuan.com/kongyixueyuan
$ vim config.yaml
config.yaml 文件完整内容如下:
name: "kongyixueyuan-network"
#
# Schema version of the content. Used by the SDK to apply the corresponding parsing rules.
#
version: 1.0.0
#
# The client section used by GO SDK.
#
client:
# Which organization does this application instance belong to? The value must be the name of an org
# defined under "organizations"
organization: Org1
logging:
level: info
# Global configuration for peer, event service and orderer timeouts
# if this this section is omitted, then default values will be used (same values as below)
# peer:
# timeout:
# connection: 10s
# response: 180s
# discovery:
# # Expiry period for discovery service greylist filter
# # The channel client will greylist peers that are found to be offline
# # to prevent re-selecting them in subsequent retries.
# # This interval will define how long a peer is greylisted
# greylistExpiry: 10s
# eventService:
# # Event service type (optional). If not specified then the type is automatically
# # determined from channel capabilities.
# type: (deliver|eventhub)
# the below timeouts are commented out to use the default values that are found in
# "pkg/fab/endpointconfig.go"
# the client is free to override the default values by uncommenting and resetting
# the values as they see fit in their config file
# timeout:
# connection: 15s
# registrationResponse: 15s
# orderer:
# timeout:
# connection: 15s
# response: 15s
# global:
# timeout:
# query: 180s
# execute: 180s
# resmgmt: 180s
# cache:
# connectionIdle: 30s
# eventServiceIdle: 2m
# channelConfig: 30m
# channelMembership: 30s
# discovery: 10s
# selection: 10m
# Root of the MSP directories with keys and certs.
cryptoconfig:
path: ${GOPATH}/src/github.com/kongyixueyuan.com/kongyixueyuan/fixtures/crypto-config
# Some SDKs support pluggable KV stores, the properties under "credentialStore"
# are implementation specific
credentialStore:
path: /tmp/kongyixueyuan-store
# [Optional]. Specific to the CryptoSuite implementation used by GO SDK. Software-based implementations
# requiring a key store. PKCS#11 based implementations does not.
cryptoStore:
path: /tmp/kongyixueyuan-msp
# BCCSP config for the client. Used by GO SDK.
BCCSP:
security:
enabled: true
default:
provider: "SW"
hashAlgorithm: "SHA2"
softVerify: true
level: 256
tlsCerts:
# [Optional]. Use system certificate pool when connecting to peers, orderers (for negotiating TLS) Default: false
systemCertPool: false
# [Optional]. Client key and cert for TLS handshake with peers and orderers
client:
key:
path:
cert:
path:
#
# [Optional]. But most apps would have this section so that channel objects can be constructed
# based on the content below. If an app is creating channels, then it likely will not need this
# section.
#
channels:
# name of the channel
kevinkongyixueyuan:
# Required. list of orderers designated by the application to use for transactions on this
# channel. This list can be a result of access control ("org1" can only access "ordererA"), or
# operational decisions to share loads from applications among the orderers. The values must
# be "names" of orgs defined under "organizations/peers"
# deprecated: not recommended, to override any orderer configuration items, entity matchers should be used.
# orderers:
# - orderer.kevin.kongyixueyuan.com
# Required. list of peers from participating orgs
peers:
peer0.org1.kevin.kongyixueyuan.com:
# [Optional]. will this peer be sent transaction proposals for endorsement? The peer must
# have the chaincode installed. The app can also use this property to decide which peers
# to send the chaincode install request. Default: true
endorsingPeer: true
# [Optional]. will this peer be sent query proposals? The peer must have the chaincode
# installed. The app can also use this property to decide which peers to send the
# chaincode install request. Default: true
chaincodeQuery: true
# [Optional]. will this peer be sent query proposals that do not require chaincodes, like
# queryBlock(), queryTransaction(), etc. Default: true
ledgerQuery: true
# [Optional]. will this peer be the target of the SDK's listener registration? All peers can
# produce events but the app typically only needs to connect to one to listen to events.
# Default: true
eventSource: true
peer1.org1.kevin.kongyixueyuan.com:
endorsingPeer: true
chaincodeQuery: true
ledgerQuery: true
eventSource: true
policies:
#[Optional] options for retrieving channel configuration blocks
queryChannelConfig:
#[Optional] min number of success responses (from targets/peers)
minResponses: 1
#[Optional] channel config will be retrieved for these number of random targets
maxTargets: 1
#[Optional] retry options for query config block
retryOpts:
#[Optional] number of retry attempts
attempts: 5
#[Optional] the back off interval for the first retry attempt
initialBackoff: 500ms
#[Optional] the maximum back off interval for any retry attempt
maxBackoff: 5s
#[Optional] he factor by which the initial back off period is exponentially incremented
backoffFactor: 2.0
#[Optional] options for retrieving discovery info
discovery:
#[Optional] discovery info will be retrieved for these number of random targets
maxTargets: 2
#[Optional] retry options for retrieving discovery info
retryOpts:
#[Optional] number of retry attempts
attempts: 4
#[Optional] the back off interval for the first retry attempt
initialBackoff: 500ms
#[Optional] the maximum back off interval for any retry attempt
maxBackoff: 5s
#[Optional] he factor by which the initial back off period is exponentially incremented
backoffFactor: 2.0
#[Optional] options for the event service
eventService:
# [Optional] resolverStrategy specifies the peer resolver strategy to use when connecting to a peer
# Possible values: [PreferOrg (default), MinBlockHeight, Balanced]
#
# PreferOrg:
# Determines which peers are suitable based on block height lag threshold, although will prefer the peers in the
# current org (as long as their block height is above a configured threshold). If none of the peers from the current org
# are suitable then a peer from another org is chosen.
# MinBlockHeight:
# Chooses the best peer according to a block height lag threshold. The maximum block height of all peers is
# determined and the peers whose block heights are under the maximum height but above a provided "lag" threshold are load
# balanced. The other peers are not considered.
# Balanced:
# Chooses peers using the configured balancer.
resolverStrategy: PreferOrg
# [Optional] balancer is the balancer to use when choosing a peer to connect to
# Possible values: [Random (default), RoundRobin]
balancer: Random
# [Optional] blockHeightLagThreshold sets the block height lag threshold. This value is used for choosing a peer
# to connect to. If a peer is lagging behind the most up-to-date peer by more than the given number of
# blocks then it will be excluded from selection.
# If set to 0 then only the most up-to-date peers are considered.
# If set to -1 then all peers (regardless of block height) are considered for selection.
# Default: 5
blockHeightLagThreshold: 5
# [Optional] reconnectBlockHeightLagThreshold - if >0 then the event client will disconnect from the peer if the peer's
# block height falls behind the specified number of blocks and will reconnect to a better performing peer.
# If set to 0 then this feature is disabled.
# Default: 10
# NOTES:
# - peerMonitorPeriod must be >0 to enable this feature
# - Setting this value too low may cause the event client to disconnect/reconnect too frequently, thereby
# affecting performance.
reconnectBlockHeightLagThreshold: 10
# [Optional] peerMonitorPeriod is the period in which the connected peer is monitored to see if
# the event client should disconnect from it and reconnect to another peer.
# Default: 0 (disabled)
peerMonitorPeriod: 5s
#
# list of participating organizations in this network
#
organizations:
Org1:
mspid: org1.kevin.kongyixueyuan.com
cryptoPath: peerOrganizations/org1.kevin.kongyixueyuan.com/users/{userName}@org1.kevin.kongyixueyuan.com/msp
peers:
- peer0.org1.kevin.kongyixueyuan.com
- peer1.org1.kevin.kongyixueyuan.com
# [Optional]. Certificate Authorities issue certificates for identification purposes in a Fabric based
# network. Typically certificates provisioning is done in a separate process outside of the
# runtime network. Fabric-CA is a special certificate authority that provides a REST APIs for
# dynamic certificate management (enroll, revoke, re-enroll). The following section is only for
# Fabric-CA servers.
certificateAuthorities:
- ca.org1.kevin.kongyixueyuan.com
#
# List of orderers to send transaction and channel create/update requests to. For the time
# being only one orderer is needed. If more than one is defined, which one get used by the
# SDK is implementation specific. Consult each SDK's documentation for its handling of orderers.
#
orderers:
orderer.kevin.kongyixueyuan.com:
url: localhost:7050
# these are standard properties defined by the gRPC library
# they will be passed in as-is to gRPC client constructor
grpcOptions:
ssl-target-name-override: orderer.kevin.kongyixueyuan.com
# These parameters should be set in coordination with the keepalive policy on the server,
# as incompatible settings can result in closing of connection.
# When duration of the 'keep-alive-time' is set to 0 or less the keep alive client parameters are disabled
keep-alive-time: 0s
keep-alive-timeout: 20s
keep-alive-permit: false
fail-fast: false
# allow-insecure will be taken into consideration if address has no protocol defined, if true then grpc or else grpcs
allow-insecure: false
tlsCACerts:
# Certificate location absolute path
path: ${GOPATH}/src/github.com/kongyixueyuan.com/kongyixueyuan/fixtures/crypto-config/ordererOrganizations/kevin.kongyixueyuan.com/tlsca/tlsca.kevin.kongyixueyuan.com-cert.pem
#
# List of peers to send various requests to, including endorsement, query
# and event listener registration.
#
peers:
peer0.org1.kevin.kongyixueyuan.com:
# this URL is used to send endorsement and query requests
url: localhost:7051
# eventUrl is only needed when using eventhub (default is delivery service)
eventUrl: localhost:7053
grpcOptions:
ssl-target-name-override: peer0.org1.kevin.kongyixueyuan.com
# These parameters should be set in coordination with the keepalive policy on the server,
# as incompatible settings can result in closing of connection.
# When duration of the 'keep-alive-time' is set to 0 or less the keep alive client parameters are disabled
keep-alive-time: 0s
keep-alive-timeout: 20s
keep-alive-permit: false
fail-fast: false
# allow-insecure will be taken into consideration if address has no protocol defined, if true then grpc or else grpcs
allow-insecure: false
tlsCACerts:
# Certificate location absolute path
path: ${GOPATH}/src/github.com/kongyixueyuan.com/kongyixueyuan/fixtures/crypto-config/peerOrganizations/org1.kevin.kongyixueyuan.com/tlsca/tlsca.org1.kevin.kongyixueyuan.com-cert.pem
peer1.org1.kevin.kongyixueyuan.com:
# this URL is used to send endorsement and query requests
url: localhost:7151
# eventUrl is only needed when using eventhub (default is delivery service)
eventUrl: localhost:7153
grpcOptions:
ssl-target-name-override: peer1.org1.kevin.kongyixueyuan.com
# These parameters should be set in coordination with the keepalive policy on the server,
# as incompatible settings can result in closing of connection.
# When duration of the 'keep-alive-time' is set to 0 or less the keep alive client parameters are disabled
keep-alive-time: 0s
keep-alive-timeout: 20s
keep-alive-permit: false
fail-fast: false
# allow-insecure will be taken into consideration if address has no protocol defined, if true then grpc or else grpcs
allow-insecure: false
tlsCACerts:
# Certificate location absolute path
path: ${GOPATH}/src/github.com/kongyixueyuan.com/kongyixueyuan/fixtures/crypto-config/peerOrganizations/org1.kevin.kongyixueyuan.com/tlsca/tlsca.org1.kevin.kongyixueyuan.com-cert.pem
#
# Fabric-CA is a special kind of Certificate Authority provided by Hyperledger Fabric which allows
# certificate management to be done via REST APIs. Application may choose to use a standard
# Certificate Authority instead of Fabric-CA, in which case this section would not be specified.
#
certificateAuthorities:
ca.org1.kevin.kongyixueyuan.com:
url: http://localhost:7054
tlsCACerts:
# Certificate location absolute path
path: ${GOPATH}/src/github.com/kongyixueyuan.com/kongyixueyuan/fixtures/crypto-config/peerOrganizations/org1.kevin.kongyixueyuan.com/ca/ca.org1.kevin.kongyixueyuan.com-cert.pem
# Fabric-CA supports dynamic user enrollment via REST APIs. A "root" user, a.k.a registrar, is
# needed to enroll and invoke new users.
registrar:
enrollId: admin
enrollSecret: adminpw
# [Optional] The optional name of the CA.
caName: ca.org1.kevin.kongyixueyuan.com
entityMatchers:
peer:
- pattern: (w*)peer0.org1.kevin.kongyixueyuan.com(w*)
urlSubstitutionExp: localhost:7051
eventUrlSubstitutionExp: localhost:7053
sslTargetOverrideUrlSubstitutionExp: peer0.org1.kevin.kongyixueyuan.com
mappedHost: peer0.org1.kevin.kongyixueyuan.com
- pattern: (w*)peer1.org1.kevin.kongyixueyuan.com(w*)
urlSubstitutionExp: localhost:7151
eventUrlSubstitutionExp: localhost:7153
sslTargetOverrideUrlSubstitutionExp: peer1.org1.kevin.kongyixueyuan.com
mappedHost: peer1.org1.kevin.kongyixueyuan.com
orderer:
- pattern: (w*)orderer.kevin.kongyixueyuan.com(w*)
urlSubstitutionExp: localhost:7050
sslTargetOverrideUrlSubstitutionExp: orderer.kevin.kongyixueyuan.com
mappedHost: orderer.kevin.kongyixueyuan.com
certificateAuthorities:
- pattern: (w*)ca.org1.kevin.kongyixueyuan.com(w*)
urlSubstitutionExp: http://localhost:7054
mappedHost: ca.org1.kevin.kongyixueyuan.com
3.2、定义所需结构体
配置文件完成指定的配置信息之后，我们开始编写代码。
在项目的根目录下添加一个名为 sdkInit 的新目录，我们将在这个文件夹中创建 SDK，并根据配置信息创建应用通道
$ mkdir sdkInit
1
为了方便管理 Hyperledger Fabric 网络环境，我们将在 sdkInit 目录中创建一个 fabricInitInfo.go 的源代码文件，用于定义一个结构体，包括 Fabric SDK 所需的各项相关信息
$ vim sdkInit/fabricInitInfo.go
1
fabricInitInfo.go 源代码如下：
package sdkInit
import (
"github.com/hyperledger/fabric-sdk-go/pkg/client/resmgmt"
)
type InitInfo struct {
ChannelID string
ChannelConfig string
OrgAdmin string
OrgName string
OrdererOrgName string
OrgResMgmt *resmgmt.Client
}
3.3、创建SDK
在 sdkInit 目录下新创建一个名为 start.go 的go文件利用 vim 编辑器进行编辑：
$ vim sdkInit/start.go
1
package sdkInit
import (
"github.com/hyperledger/fabric-sdk-go/pkg/fabsdk"
"github.com/hyperledger/fabric-sdk-go/pkg/core/config"
"fmt"
"github.com/hyperledger/fabric-sdk-go/pkg/client/resmgmt"
mspclient "github.com/hyperledger/fabric-sdk-go/pkg/client/msp"
"github.com/hyperledger/fabric-sdk-go/pkg/common/providers/msp"
"github.com/hyperledger/fabric-sdk-go/pkg/common/errors/retry"
)
const ChaincodeVersion = "1.0"
func SetupSDK(ConfigFile string, initialized bool) (*fabsdk.FabricSDK, error) {
if initialized {
return nil, fmt.Errorf("Fabric SDK已被实例化")
}
sdk, err := fabsdk.New(config.FromFile(ConfigFile))
if err != nil {
return nil, fmt.Errorf("实例化Fabric SDK失败: %v", err)
}
fmt.Println("Fabric SDK初始化成功")
return sdk, nil
}
func CreateChannel(sdk *fabsdk.FabricSDK, info *InitInfo) error {
clientContext := sdk.Context(fabsdk.WithUser(info.OrgAdmin), fabsdk.WithOrg(info.OrgName))
if clientContext == nil {
return fmt.Errorf("根据指定的组织名称与管理员创建资源管理客户端Context失败")
}
// New returns a resource management client instance.
resMgmtClient, err := resmgmt.New(clientContext)
if err != nil {
return fmt.Errorf("根据指定的资源管理客户端Context创建通道管理客户端失败: %v", err)
}
// New creates a new Client instance
mspClient, err := mspclient.New(sdk.Context(), mspclient.WithOrg(info.OrgName))
if err != nil {
return fmt.Errorf("根据指定的 OrgName 创建 Org MSP 客户端实例失败: %v", err)
}
// Returns: signing identity
adminIdentity, err := mspClient.GetSigningIdentity(info.OrgAdmin)
if err != nil {
return fmt.Errorf("获取指定id的签名标识失败: %v", err)
}
// SaveChannelRequest holds parameters for save channel request
channelReq := resmgmt.SaveChannelRequest{ChannelID:info.ChannelID, ChannelConfigPath:info.ChannelConfig, SigningIdentities:[]msp.SigningIdentity{adminIdentity}}
// save channel response with transaction ID
_, err = resMgmtClient.SaveChannel(channelReq, resmgmt.WithRetry(retry.DefaultResMgmtOpts), resmgmt.WithOrdererEndpoint(info.OrdererOrgName))
if err != nil {
return fmt.Errorf("创建应用通道失败: %v", err)
}
fmt.Println("通道已成功创建，")
info.OrgResMgmt = resMgmtClient
// allows for peers to join existing channel with optional custom options (specific peers, filtered peers). If peer(s) are not specified in options it will default to all peers that belong to client's MSP.
err = info.OrgResMgmt.JoinChannel(info.ChannelID, resmgmt.WithRetry(retry.DefaultResMgmtOpts), resmgmt.WithOrdererEndpoint(info.OrdererOrgName))
if err != nil {
return fmt.Errorf("Peers加入通道失败: %v", err)
}
fmt.Println("peers 已成功加入通道.")
return nil
}
在这个阶段，我们只初始化一个客户端，它将与 peer，CA 和 orderer进行通信。 还创建了一个指定的应用通道, 并将 Peer 节点加入到此通道中
3.4、编写测试代码
为了确保客户端能够初始化所有组件，将在启动网络的情况下进行简单的测试。 为了做到这一点，我们需要编写 Go 代码，在项目根目录下新创建一个 main.go 的主文件并编辑内容
$ cd $GOPATH/src/github.com/kongyixueyuan.com/kongyixueyuan
$ vim main.go
1
2
main.go 文件完整源代码如下：
package main
import (
"os"
"fmt"
"github.com/kongyixueyuan.com/kongyixueyuan/sdkInit"
)
const (
configFile = "config.yaml"
initialized = false
SimpleCC = "simplecc"
)
func main() {
initInfo := &sdkInit.InitInfo{
ChannelID: "kevinkongyixueyuan",
ChannelConfig: os.Getenv("GOPATH") + "/src/github.com/kongyixueyuan.com/kongyixueyuan/fixtures/artifacts/channel.tx",
OrgAdmin:"Admin",
OrgName:"Org1",
OrdererOrgName: "orderer.kevin.kongyixueyuan.com",
}
sdk, err := sdkInit.SetupSDK(configFile, initialized)
if err != nil {
fmt.Printf(err.Error())
return
}
defer sdk.Close()
err = sdkInit.CreateChannel(sdk, initInfo)
if err != nil {
fmt.Println(err.Error())
return
}
}
四、 满足依赖
4.1、 安装dep工具
在运行应用程序之前，需要将 Go 源代码时行编译，但在开始编译之前，我们需要使用一个 vendor 目录来包含应用中所需的所有的依赖关系。 在我们的GOPATH中，我们有Fabric SDK Go和其他项目。 在尝试编译应用程序时，Golang 会在 GOPATH 中搜索依赖项，但首先会检查项目中是否存在vendor 文件夹。 如果依赖性得到满足，那么 Golang 就不会去检查 GOPATH 或 GOROOT。 这在使用几个不同版本的依赖关系时非常有用（可能会发生一些冲突，比如在例子中有多个BCCSP定义，通过使用像dep这样的工具在vendor目录中来处理这些依赖关系。
将如下环境变量设置到用户的环境文件中(.bashrc)中
$ vim ~/.bashrc
export PATH=$PATH:$GOPATH/bin
执行 source 命令
$ source ~/.bashrc
安装 dep 工具
$ go get -u github.com/golang/dep/cmd/dep
4.2、下载所需依赖
dep 工具安装好之后我们来安装应用所需要的依赖
使用 dep 命令需要一个名为 Gopkg.toml 的配置文件指定依赖信息
创建一个名为Gopkg.toml的文件并将其复制到里面：
$ vim Gopkg.toml
ignored = ["github.com/kongyixueyuan.com/kongyixueyuan/chaincode"]
[[constraint]]
# Release v1.0.0-alpha4
name = "github.com/hyperledger/fabric-sdk-go"
revision = "768766943cc713f3ffcc439be3d4c99d4f72c6c5"
使用dep限制在 vendor 中指定希望SDK的特定版本。
保存该文件，然后执行 dep ensure 命令，该命令会自动将项目所需的依赖下载至当前的 vendor 目录中（下载依赖可能需要一段时间）：
$ dep ensure
提醒：dep ensure 命令执行由于时间比较长甚至会失败（网络原因），所以执行一次后即可，在后面的Makefile中可注释@dep ensure命令。
4.3、测试Fabric-SDK
所在依赖下载安装完成后，我们就可以进行测试
首先启动网络：
$ cd fixtures
$ docker-compose up -d
然后编译并运行：
$ cd ..
$ go build
$ ./kongyixueyuan
命令执行后输出结果如下图所示：
如果出现上图的输出结果，则说明执行成功，否则需要根据出现的错误提示进行相应的处理。
4.4、 利用Makefile
Fabric SDK生成一些文件，如证书，二进制文件和临时文件。 关闭网络不会完全清理环境，当需要重新启动时，这些文件将被使用以避免重复的构建过程。 对于开发，可以快速测试，但对于真正的测试环境，需要清理所有内容并从头开始。为提高效率我们将上述流程写成Makefile。
Makefile 文件完整内容如下：
.PHONY: all dev clean build env-up env-down run
all: clean build env-up run
dev: build run
##### BUILD
build:
@echo "Build ..."
@dep ensure
@go build
@echo "Build done"
##### ENV
env-up:
@echo "Start environment ..."
@cd fixtures && docker-compose up --force-recreate -d
@echo "Environment up"
env-down:
@echo "Stop environment ..."
@cd fixtures && docker-compose down
@echo "Environment down"
##### RUN
run:
@echo "Start app ..."
@./kongyixueyuan
##### CLEAN
clean: env-down
@echo "Clean up ..."
@rm -rf /tmp/kongyixueyuan-* kongyixueyuan
@docker rm -f -v `docker ps -a --no-trunc | grep "kongyixueyuan" | cut -d ' ' -f 1` 2>/dev/null || true
@docker rmi `docker images --no-trunc | grep "kongyixueyuan" | cut -d ' ' -f 1` 2>/dev/null || true
@echo "Clean up done"
现在完成任务：
整个环境将被清理干净，
go程序将被编译，
之后将部署网络
最后该应用程序将启动并运行。
要使用它，请进入项目的根目录并使用make命令：
任务all ： make或make all
任务clean ：清理一切并释放网络（ make clean ）
任务build ：只需构建应用程序（ make build ）
任务env-up ：只需建立网络（ make env-up ）
五、链码开发
为了便于测试及简化代码，我们实现一个简单的链码功能，能够实现对分类账本中的数据进行设置（PutState（k，v））及相应的查询（GetState（k））功能即可。
编写链码
创建一个存放链码文件的 chaincode 目录，然后在该目录下创建一个 main.go 的文件并对其进行编辑
$ mkdir chaincode
$ vim chaincode/main.go
main.go 文件内容如下：
package main
import (
"github.com/hyperledger/fabric/core/chaincode/shim"
"github.com/hyperledger/fabric/protos/peer"
"fmt"
)
type SimpleChaincode struct {
}
func (t *SimpleChaincode) Init(stub shim.ChaincodeStubInterface) peer.Response{
return shim.Success(nil)
}
func (t *SimpleChaincode) Invoke(stub shim.ChaincodeStubInterface) peer.Response{
fun, args := stub.GetFunctionAndParameters()
var result string
var err error
if fun == "set"{
result, err = set(stub, args)
}else{
result, err = get(stub, args)
}
if err != nil{
return shim.Error(err.Error())
}
return shim.Success([]byte(result))
}
func set(stub shim.ChaincodeStubInterface, args []string)(string, error){
if len(args) != 3{
return "", fmt.Errorf("给定的参数错误")
}
err := stub.PutState(args[0], []byte(args[1]))
if err != nil{
return "", fmt.Errorf(err.Error())
}
err = stub.SetEvent(args[2], []byte{})
if err != nil {
return "", fmt.Errorf(err.Error())
}
return string(args[0]), nil
}
func get(stub shim.ChaincodeStubInterface, args []string)(string, error){
if len(args) != 1{
return "", fmt.Errorf("给定的参数错误")
}
result, err := stub.GetState(args[0])
if err != nil{
return "", fmt.Errorf("获取数据发生错误")
}
if result == nil{
return "", fmt.Errorf("根据 %s 没有获取到相应的数据", args[0])
}
return string(result), nil
}
func main(){
err := shim.Start(new(SimpleChaincode))
if err != nil{
fmt.Printf("启动SimpleChaincode时发生错误: %s", err)
}
}
链码编写好以后，我们需要使用 Fabric-SDK-Go 提供的相关 API 来实现对链码的安装及实例化操作，而无需在命令提示符中输入烦锁的相关操作命令。
六、链码安装及实例化
6.1、声明结构体
新建一个结构体，声明在 sdkInit/fabricInitInfo.go 文件中
$ vim sdkInit/fabricInitInfo.go
fabricInitInfo.go 文件完整内容如下：
package sdkInit
import (
"github.com/hyperledger/fabric-sdk-go/pkg/client/resmgmt"
)
type InitInfo struct {
ChannelID string
ChannelConfig string
OrgAdmin string
OrgName string
OrdererOrgName string
OrgResMgmt *resmgmt.Client
ChaincodeID string
ChaincodeGoPath string
ChaincodePath string
UserName string
}
6.2、 使用Fabric-SDK安装及实例化链码
编辑 sdkInit/start.go 文件，利用Fabric-SDK提供的接口，对链码进行安装及实例化
$ vim sdkInit/start.go
1
在 start.go 文件中添加如下内容
import (
[......]
"github.com/hyperledger/fabric-sdk-go/pkg/fab/ccpackager/gopackager"
"github.com/hyperledger/fabric-sdk-go/third_party/github.com/hyperledger/fabric/common/cauthdsl"
"github.com/hyperledger/fabric-sdk-go/pkg/client/channel"
)
func InstallAndInstantiateCC(sdk *fabsdk.FabricSDK, info *InitInfo) (*channel.Client, error) {
fmt.Println("开始安装链码......")
// creates new go lang chaincode package
ccPkg, err := gopackager.NewCCPackage(info.ChaincodePath, info.ChaincodeGoPath)
if err != nil {
return nil, fmt.Errorf("创建链码包失败: %v", err)
}
// contains install chaincode request parameters
installCCReq := resmgmt.InstallCCRequest{Name: info.ChaincodeID, Path: info.ChaincodePath, Version: ChaincodeVersion, Package: ccPkg}
// allows administrators to install chaincode onto the filesystem of a peer
_, err = info.OrgResMgmt.InstallCC(installCCReq, resmgmt.WithRetry(retry.DefaultResMgmtOpts))
if err != nil {
return nil, fmt.Errorf("安装链码失败: %v", err)
}
fmt.Println("指定的链码安装成功")
fmt.Println("开始实例化链码......")
// returns a policy that requires one valid
ccPolicy := cauthdsl.SignedByAnyMember([]string{"org1.kevin.kongyixueyuan.com"})
instantiateCCReq := resmgmt.InstantiateCCRequest{Name: info.ChaincodeID, Path: info.ChaincodePath, Version: ChaincodeVersion, Args: [][]byte{[]byte("init")}, Policy: ccPolicy}
// instantiates chaincode with optional custom options (specific peers, filtered peers, timeout). If peer(s) are not specified
_, err = info.OrgResMgmt.InstantiateCC(info.ChannelID, instantiateCCReq, resmgmt.WithRetry(retry.DefaultResMgmtOpts))
if err != nil {
return nil, fmt.Errorf("实例化链码失败: %v", err)
}
fmt.Println("链码实例化成功")
clientChannelContext := sdk.ChannelContext(info.ChannelID, fabsdk.WithUser(info.UserName), fabsdk.WithOrg(info.OrgName))
// returns a Client instance. Channel client can query chaincode, execute chaincode and register/unregister for chaincode events on specific channel.
channelClient, err := channel.New(clientChannelContext)
if err != nil {
return nil, fmt.Errorf("创建应用通道客户端失败: %v", err)
}
fmt.Println("通道客户端创建成功，可以利用此客户端调用链码进行查询或执行事务.")
return channelClient, nil
}
6.3、 在main中调用
编辑 main.go 文件
$ vim main.go
1
main.go 完整内容如下：
package main
import (
"os"
"fmt"
"github.com/kongyixueyuan.com/kongyixueyuan/sdkInit"
)
const (
configFile = "config.yaml"
initialized = false
SimpleCC = "simplecc"
)
func main() {
initInfo := &sdkInit.InitInfo{
ChannelID: "kevinkongyixueyuan",
ChannelConfig: os.Getenv("GOPATH") + "/src/github.com/kongyixueyuan.com/kongyixueyuan/fixtures/artifacts/channel.tx",
OrgAdmin:"Admin",
OrgName:"Org1",
OrdererOrgName: "orderer.kevin.kongyixueyuan.com",
ChaincodeID: SimpleCC,
ChaincodeGoPath: os.Getenv("GOPATH"),
ChaincodePath: "github.com/kongyixueyuan.com/kongyixueyuan/chaincode/",
UserName:"User1",
}
sdk, err := sdkInit.SetupSDK(configFile, initialized)
if err != nil {
fmt.Printf(err.Error())
return
}
defer sdk.Close()
err = sdkInit.CreateChannel(sdk, initInfo)
if err != nil {
fmt.Println(err.Error())
return
}
channelClient, err := sdkInit.InstallAndInstantiateCC(sdk, initInfo)
if err != nil {
fmt.Println(err.Error())
return
}
fmt.Println(channelClient)
}
6.4、测试
执行 make 命令
$ make
输出如下：
在此，我们已经成功搭建了Fabric的网络环境，并通过 fabric-sdk-go 创建了应用通道，将peer加入通道，在peer上安装并实例化了链码。那么如何在真正的应用程序中实现链码的调用，对分类账本中的状态进行操作，fabric-sdk 不仅提供了相应的强大功能，而且还给开发人员设计提供了相应的API 接口，以方便开发人员随时调用。做为开发设计人员，我们不仅要考虑用户操作的方便性及可交互性，还需要考虑应用程序后期的可扩展性及维护性，为此我们将为应用增加一个业务层，所有的客户请求都由业务层发送给链码，通过对链码的调用，进而实现对分类账本状态的操作。
七、在业务层调用链码
7.1、 事件处理
在项目根目录下创建一个 service 目录作为业务层，在业务层中，我们使用 Fabric-SDK-Go 提供的接口对象调用相应的 API 以实现对链码的访问，最终实现对分类账本中的状态进行操作。
$ cd $GOPATH/src/github.com/kongyixueyuan.com/kongyixueyuan
$ mkdir service
在 service 目录下创建 domain.go 文件并进行编辑， 声明一个结构体及对事件相关而封装的源代码
$ vim service/domain.go
domain.go 文件完整内容如下：
package service
import (
"github.com/hyperledger/fabric-sdk-go/pkg/client/channel"
"fmt"
"time"
"github.com/hyperledger/fabric-sdk-go/pkg/common/providers/fab"
)
type ServiceSetup struct {
ChaincodeID string
Client *channel.Client
}
func regitserEvent(client *channel.Client, chaincodeID, eventID string) (fab.Registration, <-chan *fab.CCEvent) {
reg, notifier, err := client.RegisterChaincodeEvent(chaincodeID, eventID)
if err != nil {
fmt.Println("注册链码事件失败: %s", err)
}
return reg, notifier
}
func eventResult(notifier <-chan *fab.CCEvent, eventID string) error {
select {
case ccEvent := <-notifier:
fmt.Printf("接收到链码事件: %v
", ccEvent)
case <-time.After(time.Second * 20):
return fmt.Errorf("不能根据指定的事件ID接收到相应的链码事件(%s)", eventID)
}
return nil
}
7.2、 调用链码添加状态
在 service 目录下创建 SimpleService.go 文件
$ vim service/SimpleService.go
1
在 SimpleService.go 文件中编写内容如下，通过一个 SetInfo 函数实现链码的调用，向分类账本中添加状态的功能：
package service
import (
"github.com/hyperledger/fabric-sdk-go/pkg/client/channel"
)
func (t *ServiceSetup) SetInfo(name, num string) (string, error) {
eventID := "eventSetInfo"
reg, notifier := regitserEvent(t.Client, t.ChaincodeID, eventID)
defer t.Client.UnregisterChaincodeEvent(reg)
req := channel.Request{ChaincodeID: t.ChaincodeID, Fcn: "set", Args: [][]byte{[]byte(name), []byte(num), []byte(eventID)}}
respone, err := t.Client.Execute(req)
if err != nil {
return "", err
}
err = eventResult(notifier, eventID)
if err != nil {
return "", err
}
return string(respone.TransactionID), nil
}
测试添加状态
编辑 main.go 文件
$ vim main.go
1
main.go 中创建一个对象，并调用 SetInfo 函数，内容如下：
package main
import (
[......]
"github.com/kongyixueyuan.com/kongyixueyuan/service"
)
[......]
//===========================================//
serviceSetup := service.ServiceSetup{
ChaincodeID:SimpleCC,
Client:channelClient,
}
msg, err := serviceSetup.SetInfo("hanxiaodong", "kongyixueyuan")
if err != nil {
fmt.Println(err)
} else {
fmt.Println(msg)
}
//===========================================//
}
执行 make 命令运行应用程序
$ make
1
执行后如下图所示：
7.3、 调用链码查询状态
通过上面的 setInfo(name, num string) 函数，实现了向分类账本中添加状态，那么我们还需要实现从该分类账本中根据指定的 key 查询出相应的状态，编辑 service/SimpleService.go 文件，向该文件中添加实现查询状态的相应代码。
$ vim service/SimpleService.go
1
定义一个 GetInfo 函数，接收一个字符串类型的参数，该函数实现通过调用链码而查询状态的功能，该函数完整代码如下：
[......]
func (t *ServiceSetup) GetInfo(name string) (string, error){
req := channel.Request{ChaincodeID: t.ChaincodeID, Fcn: "get", Args: [][]byte{[]byte(name)}}
respone, err := t.Client.Query(req)
if err != nil {
return "", err
}
return string(respone.Payload), nil
}
测试查询状态
编辑 main.go 文件
$ vim main.go
1
在 main.go 文件中添加调用代码如下内容：
[......]
msg, err = serviceSetup.GetInfo("hanxiaodong")
if err != nil {
fmt.Println(err)
} else {
fmt.Println(msg)
}
//===========================================//
}
执行 make 命令运行应用程序
$ make
1
执行后如下图所示：
八、实现Web应用
8.1、目录结构
为了让普通用户可以方便地使用应用程序，选择开发成为一个Web应用，新建web目录，包含三个其他目录的目录。将使用 MVC（Model（模型）－View（视图） - Controller（控制器））模式使其更具可读性及扩展性、维护性。模型将是区块链部分，视图是模板，控制器由controllers目录中的功能提供。具体目录结构如下图所示：
web/controller 目录
controller/controllerHandler.go ： 用于接收并处理各种客户端请求的源代码文件
package controller
import (
"net/http"
"github.com/kongyixueyuan.com/kongyixueyuan/service"
)
type Application struct {
Fabric *service.ServiceSetup
}
func (app *Application) IndexView(w http.ResponseWriter, r *http.Request){
showView(w, r, "index.html", nil)
}
func (app *Application) SetInfoView(w http.ResponseWriter, r *http.Request) {
showView(w, r, "setInfo.html", nil)
}
// 根据指定的 key 设置/修改 value 信息
func (app *Application) SetInfo(w http.ResponseWriter, r *http.Request) {
// 获取提交数据
name := r.FormValue("name")
num := r.FormValue("num")
// 调用业务层, 反序列化
transactionID, err := app.Fabric.SetInfo(name, num)
// 封装响应数据
data := &struct {
Flag bool
Msg string
}{
Flag:true,
Msg:"",
}
if err != nil {
data.Msg = err.Error()
}else{
data.Msg = "操作成功，交易ID: " + transactionID
}
// 响应客户端
showView(w, r, "setInfo.html", data)
}
// 根据指定的 Key 查询信息
func (app *Application) QueryInfo(w http.ResponseWriter, r *http.Request) {
// 获取提交数据
name := r.FormValue("name")
// 调用业务层, 反序列化
msg, err := app.Fabric.GetInfo(name)
// 封装响应数据
data := &struct {
Msg string
}{
Msg:"",
}
if err != nil {
data.Msg = "没有查询到Jack对应的信息"
}else{
data.Msg = "查询成功: " + msg
}
// 响应客户端
showView(w, r, "queryReq.html", data)
}
controller/controllerResponse：用于编写响应客户端请求的源代码文件
package controller
import (
"net/http"
"path/filepath"
"html/template"
"fmt"
)
func showView(w http.ResponseWriter, r *http.Request, templateName string, data interface{}) {
page := filepath.Join("web", "tpl", templateName)
// 创建模板实例
resultTemplate, err := template.ParseFiles(page)
if err != nil {
fmt.Println("创建模板实例错误: ", err)
return
}
// 融合数据
err = resultTemplate.Execute(w, data)
if err != nil {
fmt.Println("融合模板数据时发生错误", err)
return
}
}
web/static目录下包括三个子目录，分别为：
web/static/css ：用于存放页面布局及显示样式所需的 CSS 文件
web/static/js ：用于存放编写的与用户交互的 JavaScript 源码文件
web/static/img：用户存放页面显示所需的所有图片文件
web/tpl 目录下包括三个静态 HTML 页面文件，分别为：
web/tpl/index.html： 用户访问的首页面
web/tpl/queryReq.html： 用于显示显示查询结果的页面
web/tpl/setInfo.html： 用户设置/修改状态的页面
web/webServer.go：用于指定启动Web服务及相应的路由信息
/**
author: kevin
*/
package web
import (
"net/http"
"fmt"
"github.com/kongyixueyuan.com/kongyixueyuan/web/controller"
)
func WebStart(app *controller.Application) {
fs := http.FileServer(http.Dir("web/static"))
http.Handle("/static/", http.StripPrefix("/static/", fs))
http.HandleFunc("/", app.IndexView)
http.HandleFunc("/index.html", app.IndexView)
http.HandleFunc("/setInfo.html", app.SetInfoView)
http.HandleFunc("/setReq", app.SetInfo)
http.HandleFunc("/queryReq", app.QueryInfo)
fmt.Println("启动Web服务, 监听端口号: 9000")
err := http.ListenAndServe(":9000", nil)
if err != nil {
fmt.Println("启动Web服务错误")
}
}
这些代码可以在网上找一些相似的代码改过来。
8.2、编写页面
编写下面三个html文件，内容在网上找一下改一下就行了。
index.html
queryReq.html
setInfo.html
8.3、启动Web服务
最后编辑 main.go ，以便启动Web界面实现Web应用程序
$ vim main.go
1
添加如下内容:
import(
[......]
"github.com/kongyixueyuan.com/kongyixueyuan/web"
"github.com/kongyixueyuan.com/kongyixueyuan/web/controller"
)
func main(){}
[......]
app := controller.Application{
Fabric: &serviceSetup,
}
web.WebStart(&app)
}
执行 make 命令启动Web应用：
8.4、 页面访问
打开浏览器访问: 127.0.0.1:9000
因为我们这是一个简单的 Web 应用示例，所以页面不会要求达到多么美观的地步，只是能够实现相应的功能即可。根据访问的地址，首先进入 index.html 页面，该 index.html 页面提供了两个链接（也可以通过页面顶部的菜单中访问），用于实现在在分类账本中进行状态查询或对分类账本中的状态进行修改的操作（在此不实现添加状态的操作）。
因为我们在业务层中测试过一次，通过调用业务层向分类账中添加了一条状态， 所以现在分类帐中有一个 key 为 Hanxiaodong，value 为 Kongyixueyuan 的键值对数据，可以点击 查询信息 的链接实现查询
点击页面中的 设置/修改 链接后进入一个表单页面，该页面提供了一个更改状态的表单，表单中的 key 为固定值，用户需要输入对应的 Val，之后点击提交按钮发送请求。
在 Val 输入框中输入一个值，如 ChainDesk 后点击提交按钮，表单被提交到服务器，服务器处理完毕将返回操作成功的交易ID并将其显示在页面中。
我们可以通过点击页面中的 查询信息 链接来查看状态是否更改成功
后台状况
九、总结
目前将区块链开发的整体流程从后端到前端走了一遍，过程中学习了go、链码、docker、前端等知识，为后期更好开发做了更好的储备。后期的开发主要围绕上边的流程进行，主要还是要参考网上源代码，多学习代码。
十、参考资料
Hyperledger 官网
Hyperledger Fabric 在线文档
Hyperledger Fabric-SDK-Go
Fabric-SDK-Go tests
goweb 编程
web 前端
孔壹学院
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版权声明：本文为CSDN博主「Rookie_Hang」的原创文章，遵循CC 4.0 BY-SA版权协议，转载请附上原文出处链接及本声明。
原文链接：https://blog.csdn.net/qq_40185499/article/details/104023543