1、运行前提
这里假设你已经安装了Homebrew、Go、Docker容器（并且已经下载了对应的images镜像）等环境
（具体可以查看另外一篇《Hyperledger Fabric开发环境搭建（MacOS系统）》作为参考）
- 安装Homebrew:
/usr/bin/ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)"
- 安装Go:
brew install go
- 安装Docker:
Docker界面化软件方便操作和管理，下载地址如下
（点击页面的“Get Docker”按钮即可下载）
下载地址：
https://store.docker.com/editions/community/docker-ce-desktop-mac
# 终端测试命令
docker --version
docker-compose --version
运行Hyperledger Fabric需要设置比较多的初始化设置，官方的Demo工程已经生成了对应的配置文件，以下体验部署和调用过程
2、下载fabric-samples源码
git clone https://github.com/hyperledger/fabric-samples
wenzildeiMac:test wenzil$ git clone https://github.com/hyperledger/fabric-samples
Cloning into 'fabric-samples'...
remote: Counting objects: 1518, done.
remote: Compressing objects: 100% (41/41), done.
remote: Total 1518 (delta 20), reused 45 (delta 12), pack-reused 1464
Receiving objects: 100% (1518/1518), 564.97 KiB | 32.00 KiB/s, done.
Resolving deltas: 100% (703/703), done.
3、启动Docker容器
- 用cd命令进入到"fabric-samples/basic-network"目录，利用docker-compose启动Docker容器
docker-compose -f docker-compose.yml up -d
wenzildeiMac:basic-network carisok$ docker-compose -f docker-compose.yml up -d
Creating network "net_basic" with the default driver
Creating ca.example.com ... done
Creating cli ... done
Creating orderer.example.com ... done
Creating couchdb ... done
Creating peer0.org1.example.com ... done
- 可以利用如下命令查看已经启动的Docker容器
docker ps
wenzildeiMac:basic-network carisok$ docker ps
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
6f2f13a6906b hyperledger/fabric-peer "peer node start" 9 seconds ago Up 8 seconds 0.0.0.0:7051->7051/tcp, 0.0.0.0:7053->7053/tcp peer0.org1.example.com
dbb264c6dd75 hyperledger/fabric-couchdb "tini -- /docker-ent…" 11 seconds ago Up 9 seconds 4369/tcp, 9100/tcp, 0.0.0.0:5984->5984/tcp couchdb
178060c273f7 hyperledger/fabric-ca "sh -c 'fabric-ca-se…" 11 seconds ago Up 10 seconds 0.0.0.0:7054->7054/tcp ca.example.com
58881c674fbb hyperledger/fabric-tools "/bin/bash" 11 seconds ago Up 11 seconds cli
062ca990755f hyperledger/fabric-orderer "orderer" 11 seconds ago Up 11 seconds 0.0.0.0:7050->7050/tcp orderer.example.com
4、Docker相关命令
#删除所有活跃的容器（失败重试会用到）
docker rm -f $(docker ps -aq)
#清理网络缓存（失败重试会用到）
docker network prune
#杀死所有正在运行的容器
docker kill $(docker ps -a -q)
#删除所有镜像（慎用，得重新下载镜像）
docker rmi $(docker images -q)
5、切换到管理员用户，创建和加入通道
- 切换环境到管理员用户的MSP，进入Peer节点容器peer0.org1.example.com
docker exec -it -e "CORE_PEER_MSPCONFIGPATH=/etc/hyperledger/msp/users/Admin@org1.example.com/msp" peer0.org1.example.com bash
wenzildeiMac:basic-network carisok$ docker exec -it -e "CORE_PEER_MSPCONFIGPATH=/etc/hyperledger/msp/users/Admin@org1.example.com/msp" peer0.org1.example.com bash
root@6f2f13a6906b:/opt/gopath/src/github.com/hyperledger/fabric#
- 创建通道
peer channel create -o orderer.example.com:7050 -c mychannel -f /etc/hyperledger/configtx/channel.tx
root@6f2f13a6906b:/opt/gopath/src/github.com/hyperledger/fabric# peer channel create -o orderer.example.com:7050 -c mychannel -f /etc/hyperledger/configtx/channel.tx
2018-05-08 05:40:37.509 UTC [msp] GetLocalMSP -> DEBU 001 Returning existing local MSP
2018-05-08 05:40:37.509 UTC [msp] GetDefaultSigningIdentity -> DEBU 002 Obtaining default signing identity
2018-05-08 05:40:37.512 UTC [channelCmd] InitCmdFactory -> INFO 003 Endorser and orderer connections initialized
2018-05-08 05:40:37.534 UTC [msp] GetLocalMSP -> DEBU 004 Returning existing local MSP
2018-05-08 05:40:37.534 UTC [msp] GetDefaultSigningIdentity -> DEBU 005 Obtaining default signing identity
2018-05-08 05:40:37.534 UTC [msp] GetLocalMSP -> DEBU 006 Returning existing local MSP
2018-05-08 05:40:37.534 UTC [msp] GetDefaultSigningIdentity -> DEBU 007 Obtaining default signing identity
2018-05-08 05:40:37.534 UTC [msp/identity] Sign -> DEBU 008 Sign: plaintext: 0A88060A074F7267314D535012FC052D...53616D706C65436F6E736F727469756D
2018-05-08 05:40:37.534 UTC [msp/identity] Sign -> DEBU 009 Sign: digest: A462B649F175B93B20708D74C255506E79DAA47D96B43F1DD00B981FCFBFEF63
2018-05-08 05:40:37.535 UTC [msp] GetLocalMSP -> DEBU 00a Returning existing local MSP
2018-05-08 05:40:37.535 UTC [msp] GetDefaultSigningIdentity -> DEBU 00b Obtaining default signing identity
2018-05-08 05:40:37.536 UTC [msp] GetLocalMSP -> DEBU 00c Returning existing local MSP
2018-05-08 05:40:37.536 UTC [msp] GetDefaultSigningIdentity -> DEBU 00d Obtaining default signing identity
2018-05-08 05:40:37.536 UTC [msp/identity] Sign -> DEBU 00e Sign: plaintext: 0ABF060A1508021A0608D5F0C4D70522...F7F20756FF8C1C7D32C2197CA185BFAF
2018-05-08 05:40:37.536 UTC [msp/identity] Sign -> DEBU 00f Sign: digest: 85F8C092A9B0950D25439B524CC8B36DE0BB865967F31B418370C4254342637E
2018-05-08 05:40:37.641 UTC [msp] GetLocalMSP -> DEBU 010 Returning existing local MSP
2018-05-08 05:40:37.642 UTC [msp] GetDefaultSigningIdentity -> DEBU 011 Obtaining default signing identity
2018-05-08 05:40:37.642 UTC [msp] GetLocalMSP -> DEBU 012 Returning existing local MSP
2018-05-08 05:40:37.642 UTC [msp] GetDefaultSigningIdentity -> DEBU 013 Obtaining default signing identity
2018-05-08 05:40:37.642 UTC [msp/identity] Sign -> DEBU 014 Sign: plaintext: 0ABF060A1508021A0608D5F0C4D70522...778004D484EE12080A021A0012021A00
2018-05-08 05:40:37.642 UTC [msp/identity] Sign -> DEBU 015 Sign: digest: 56E81A6FD95EECA53FDA96E6D746AAD904CDB4757E8D431C5C38596FFF59EBE4
2018-05-08 05:40:37.646 UTC [channelCmd] readBlock -> DEBU 016 Got status: &{NOT_FOUND}
2018-05-08 05:40:37.646 UTC [msp] GetLocalMSP -> DEBU 017 Returning existing local MSP
2018-05-08 05:40:37.646 UTC [msp] GetDefaultSigningIdentity -> DEBU 018 Obtaining default signing identity
2018-05-08 05:40:37.652 UTC [channelCmd] InitCmdFactory -> INFO 019 Endorser and orderer connections initialized
2018-05-08 05:40:37.853 UTC [msp] GetLocalMSP -> DEBU 01a Returning existing local MSP
2018-05-08 05:40:37.853 UTC [msp] GetDefaultSigningIdentity -> DEBU 01b Obtaining default signing identity
2018-05-08 05:40:37.853 UTC [msp] GetLocalMSP -> DEBU 01c Returning existing local MSP
2018-05-08 05:40:37.854 UTC [msp] GetDefaultSigningIdentity -> DEBU 01d Obtaining default signing identity
2018-05-08 05:40:37.854 UTC [msp/identity] Sign -> DEBU 01e Sign: plaintext: 0ABF060A1508021A0608D5F0C4D70522...58ECEBAF155112080A021A0012021A00
2018-05-08 05:40:37.854 UTC [msp/identity] Sign -> DEBU 01f Sign: digest: FA7B43F85FF0D4C304BB308383DC54D2950578BEB064C473B43796E4F9F17899
2018-05-08 05:40:37.858 UTC [channelCmd] readBlock -> DEBU 020 Received block: 0
2018-05-08 05:40:37.858 UTC [main] main -> INFO 021 Exiting.....
- 加入通道
peer channel join -b mychannel.block
root@6f2f13a6906b:/opt/gopath/src/github.com/hyperledger/fabric# peer channel join -b mychannel.block
2018-05-08 05:41:39.827 UTC [msp] GetLocalMSP -> DEBU 001 Returning existing local MSP
2018-05-08 05:41:39.827 UTC [msp] GetDefaultSigningIdentity -> DEBU 002 Obtaining default signing identity
2018-05-08 05:41:39.830 UTC [channelCmd] InitCmdFactory -> INFO 003 Endorser and orderer connections initialized
2018-05-08 05:41:39.831 UTC [msp/identity] Sign -> DEBU 004 Sign: plaintext: 0A86070A5C08011A0C0893F1C4D70510...EC190FB0E3FF1A080A000A000A000A00
2018-05-08 05:41:39.831 UTC [msp/identity] Sign -> DEBU 005 Sign: digest: 2AA40B075D666143259B537ECE13C75AFA716E1D15BA7A33803AFA9F4B4B524E
2018-05-08 05:41:39.981 UTC [channelCmd] executeJoin -> INFO 006 Peer joined the channel!
2018-05-08 05:41:39.981 UTC [main] main -> INFO 007 Exiting.....
- 退出Peer节点容器(peer0.org1.example.com)
exit
root@6f2f13a6906b:/opt/gopath/src/github.com/hyperledger/fabric# exit
exit
6、进入cli容器
docker exec -it cli /bin/bash
carisokdeiMac:basic-network carisok$ docker exec -it cli /bin/bash
7、安装链码
给Peer节点容器安装链码
peer chaincode install -n mycc -v v0 -p github.com/chaincode_example02/go
root@58881c674fbb:/opt/gopath/src/github.com/hyperledger/fabric/peer# peer chaincode install -n mycc -v v0 -p github.com/chaincode_example02/go
2018-05-08 05:42:40.937 UTC [msp] GetLocalMSP -> DEBU 001 Returning existing local MSP
2018-05-08 05:42:40.937 UTC [msp] GetDefaultSigningIdentity -> DEBU 002 Obtaining default signing identity
2018-05-08 05:42:40.938 UTC [chaincodeCmd] checkChaincodeCmdParams -> INFO 003 Using default escc
2018-05-08 05:42:40.938 UTC [chaincodeCmd] checkChaincodeCmdParams -> INFO 004 Using default vscc
2018-05-08 05:42:41.024 UTC [golang-platform] getCodeFromFS -> DEBU 005 getCodeFromFS github.com/chaincode_example02/go
2018-05-08 05:42:41.201 UTC [golang-platform] func1 -> DEBU 006 Discarding GOROOT package fmt
2018-05-08 05:42:41.201 UTC [golang-platform] func1 -> DEBU 007 Discarding provided package github.com/hyperledger/fabric/core/chaincode/shim
2018-05-08 05:42:41.201 UTC [golang-platform] func1 -> DEBU 008 Discarding provided package github.com/hyperledger/fabric/protos/peer
2018-05-08 05:42:41.202 UTC [golang-platform] func1 -> DEBU 009 Discarding GOROOT package strconv
2018-05-08 05:42:41.204 UTC [golang-platform] GetDeploymentPayload -> DEBU 00a done
2018-05-08 05:42:41.209 UTC [msp/identity] Sign -> DEBU 00b Sign: plaintext: 0A85070A5B08031A0B08D1F1C4D70510...FB8C7F070000FFFF02AE519E001C0000
2018-05-08 05:42:41.209 UTC [msp/identity] Sign -> DEBU 00c Sign: digest: 5ADE48B900A481BC50F01A4561A7BAE4ED02A3268EBC51EA4344A38D660E6B0F
2018-05-08 05:42:41.218 UTC [chaincodeCmd] install -> DEBU 00d Installed remotely response:<status:200 payload:"OK" >
2018-05-08 05:42:41.218 UTC [main] main -> INFO 00e Exiting.....
8、实例化链码
peer chaincode instantiate -o orderer.example.com:7050 -C mychannel -n mycc -v v0 -c '{"Args":["init","a","100","b","200"]}'
a的初始值为100，b的初始值为200.
出现了好几次TLS握手超时（"TLS handshake timeout"）问题，重新试过几次就好了
很多网络服务在国内被封了，特别是Google生态相关的服务，建议使用VPN（VPN也基本被封了，很难找到可以使用的，求推荐）
root@58881c674fbb:/opt/gopath/src/github.com/hyperledger/fabric/peer# peer chaincode instantiate -o orderer.example.com:7050 -C mychannel -n mycc -v v0 -c '{"Args":["init","a","100","b","200"]}'
2018-05-08 05:46:16.702 UTC [msp] GetLocalMSP -> DEBU 001 Returning existing local MSP
2018-05-08 05:46:16.702 UTC [msp] GetDefaultSigningIdentity -> DEBU 002 Obtaining default signing identity
2018-05-08 05:46:16.705 UTC [chaincodeCmd] checkChaincodeCmdParams -> INFO 003 Using default escc
2018-05-08 05:46:16.706 UTC [chaincodeCmd] checkChaincodeCmdParams -> INFO 004 Using default vscc
2018-05-08 05:46:16.707 UTC [msp/identity] Sign -> DEBU 005 Sign: plaintext: 0A91070A6708031A0C08A8F3C4D70510...30300A000A04657363630A0476736363
2018-05-08 05:46:16.707 UTC [msp/identity] Sign -> DEBU 006 Sign: digest: DD341BB4FE9945205B9B55CB15D7C3B6A785B9396F4E7827057999622CE420F7
Error: Error endorsing chaincode: rpc error: code = Unknown desc = Error starting container: error pulling image configuration: Get https://dseasb33srnrn.cloudfront.net/registry-v2/docker/registry/v2/blobs/sha256/bb/bbcbb9da2d837de73943b462f5217a5f6202a5e1cc57cc78cf1e8d9d6d4952cb/data?Expires=1525801591&Signature=Mx04gXyhUqyv4Si~gHwadobKzslnBKzNVGjXkB5H~H4D9TaVj7w9G7mLuY61oE9p0cTCU3Ov7jr0gpq9YwovJNqPcVRsyuMuhdEfmE-Jvrl2yhrJf6YIDsfl1KGuIqUiOxkKV50hNj45E~4NXM68hg516xZz2i6mCikGqaa9XZM_&Key-Pair-Id=APKAJECH5M7VWIS5YZ6Q: net/http: TLS handshake timeout
Usage:
peer chaincode instantiate [flags]
Flags:
-C, --channelID string The channel on which this command should be executed (default "testchainid")
-c, --ctor string Constructor message for the chaincode in JSON format (default "{}")
-E, --escc string The name of the endorsement system chaincode to be used for this chaincode
-l, --lang string Language the chaincode is written in (default "golang")
-n, --name string Name of the chaincode
-P, --policy string The endorsement policy associated to this chaincode
-v, --version string Version of the chaincode specified in install/instantiate/upgrade commands
-V, --vscc string The name of the verification system chaincode to be used for this chaincode
Global Flags:
--cafile string Path to file containing PEM-encoded trusted certificate(s) for the ordering endpoint
--logging-level string Default logging level and overrides, see core.yaml for full syntax
-o, --orderer string Ordering service endpoint
--test.coverprofile string Done (default "coverage.cov")
--tls Use TLS when communicating with the orderer endpoint
root@58881c674fbb:/opt/gopath/src/github.com/hyperledger/fabric/peer# peer chaincode instantiate -o orderer.example.com:7050 -C mychannel -n mycc -v v0 -c '{"Args":["init","a","100","b","200"]}'
2018-05-08 05:48:51.775 UTC [msp] GetLocalMSP -> DEBU 001 Returning existing local MSP
2018-05-08 05:48:51.775 UTC [msp] GetDefaultSigningIdentity -> DEBU 002 Obtaining default signing identity
2018-05-08 05:48:51.779 UTC [chaincodeCmd] checkChaincodeCmdParams -> INFO 003 Using default escc
2018-05-08 05:48:51.780 UTC [chaincodeCmd] checkChaincodeCmdParams -> INFO 004 Using default vscc
2018-05-08 05:48:51.781 UTC [msp/identity] Sign -> DEBU 005 Sign: plaintext: 0A91070A6708031A0C08C3F4C4D70510...30300A000A04657363630A0476736363
2018-05-08 05:48:51.781 UTC [msp/identity] Sign -> DEBU 006 Sign: digest: 197B664DD613D1FCC94790FD89B4DBF2D3871EF31FC84FB2F5560E4C037769BA
2018-05-08 05:49:10.910 UTC [msp/identity] Sign -> DEBU 007 Sign: plaintext: 0A91070A6708031A0C08C3F4C4D70510...B5653D8E17C6F74F274E6832D31C7739
2018-05-08 05:49:10.910 UTC [msp/identity] Sign -> DEBU 008 Sign: digest: A80FA179B066CDD19BD1ABC9935D017914FC9DA607182060DC90DE2223A58A7B
2018-05-08 05:49:10.926 UTC [main] main -> INFO 009 Exiting.....
9、链码调用和查询
- 链码实例化后，可以查询初始值
peer chaincode query -C mychannel -n mycc -v v0 -c '{"Args":["query","a"]}'
root@58881c674fbb:/opt/gopath/src/github.com/hyperledger/fabric/peer# peer chaincode query -C mychannel -n mycc -v v0 -c '{"Args":["query","a"]}'
2018-05-08 05:49:36.483 UTC [msp] GetLocalMSP -> DEBU 001 Returning existing local MSP
2018-05-08 05:49:36.483 UTC [msp] GetDefaultSigningIdentity -> DEBU 002 Obtaining default signing identity
2018-05-08 05:49:36.483 UTC [chaincodeCmd] checkChaincodeCmdParams -> INFO 003 Using default escc
2018-05-08 05:49:36.483 UTC [chaincodeCmd] checkChaincodeCmdParams -> INFO 004 Using default vscc
2018-05-08 05:49:36.483 UTC [msp/identity] Sign -> DEBU 005 Sign: plaintext: 0A91070A6708031A0C08F0F4C4D70510...6D7963631A0A0A0571756572790A0161
2018-05-08 05:49:36.483 UTC [msp/identity] Sign -> DEBU 006 Sign: digest: 2EB7EBA3181FE95932D4217C1968A7413DAE6E9D22D5FD8204B64C82DDD0FFDC
Query Result: 100
2018-05-08 05:49:36.572 UTC [main] main -> INFO 007 Exiting.....
- 从"a"转移10到"b"
peer chaincode invoke -C mychannel -n mycc -v v0 -c '{"Args":["invoke","a","b","10"]}'
####此处省略上百行结果输出####
2018-05-08 05:50:53.804 UTC [chaincodeCmd] chaincodeInvokeOrQuery -> INFO 0a6 Chaincode invoke successful. result: status:200
2018-05-08 05:50:53.804 UTC [main] main -> INFO 0a7 Exiting.....
- 再次查询“a”和"b"的值
peer chaincode query -C mychannel -n mycc -v v0 -c '{"Args":["query","a"]}'
peer chaincode query -C mychannel -n mycc -v v0 -c '{"Args":["query","b"]}'
结果显示a为90，b为210.
root@58881c674fbb:/opt/gopath/src/github.com/hyperledger/fabric/peer# peer chaincode query -C mychannel -n mycc -v v0 -c '{"Args":["query","a"]}'
2018-05-08 05:52:33.872 UTC [msp] GetLocalMSP -> DEBU 001 Returning existing local MSP
2018-05-08 05:52:33.872 UTC [msp] GetDefaultSigningIdentity -> DEBU 002 Obtaining default signing identity
2018-05-08 05:52:33.872 UTC [chaincodeCmd] checkChaincodeCmdParams -> INFO 003 Using default escc
2018-05-08 05:52:33.872 UTC [chaincodeCmd] checkChaincodeCmdParams -> INFO 004 Using default vscc
2018-05-08 05:52:33.874 UTC [msp/identity] Sign -> DEBU 005 Sign: plaintext: 0A91070A6708031A0C08A1F6C4D70510...6D7963631A0A0A0571756572790A0161
2018-05-08 05:52:33.874 UTC [msp/identity] Sign -> DEBU 006 Sign: digest: B9872DD1C5F8577DBD22401AC64135AF83BA0A56226C94F0B3FF6EA9D1A9F1D5
Query Result: 90
2018-05-08 05:52:33.907 UTC [main] main -> INFO 007 Exiting.....
root@58881c674fbb:/opt/gopath/src/github.com/hyperledger/fabric/peer# peer chaincode query -C mychannel -n mycc -v v0 -c '{"Args":["query","b"]}'
2018-05-08 05:53:05.120 UTC [msp] GetLocalMSP -> DEBU 001 Returning existing local MSP
2018-05-08 05:53:05.120 UTC [msp] GetDefaultSigningIdentity -> DEBU 002 Obtaining default signing identity
2018-05-08 05:53:05.120 UTC [chaincodeCmd] checkChaincodeCmdParams -> INFO 003 Using default escc
2018-05-08 05:53:05.120 UTC [chaincodeCmd] checkChaincodeCmdParams -> INFO 004 Using default vscc
2018-05-08 05:53:05.121 UTC [msp/identity] Sign -> DEBU 005 Sign: plaintext: 0A90070A6608031A0B08C1F6C4D70510...6D7963631A0A0A0571756572790A0162
2018-05-08 05:53:05.121 UTC [msp/identity] Sign -> DEBU 006 Sign: digest: 749B62618BB4B9D7A70188BFCF3DBE050E9D4B635F040719EAA1476B58E85E4C
Query Result: 210
2018-05-08 05:53:05.144 UTC [main] main -> INFO 007 Exiting.....
10、代码查看和简单解读
打开github上面的代码
https://github.com/hyperledger/fabric-samples/blob/release-1.1/chaincode/chaincode_example02/go/chaincode_example02.go
和下载的“fabric-samples/chaincode/chaincode_example02/go"目录下的"chaincode_example02.go"文件对比，内容是一样的，说明是从"release-1.1"分支克隆下来的。
pic1.png
再来回顾下上面从"a"转移“b”的命令：
peer chaincode invoke -C mychannel -n mycc -v v0 -c '{"Args":["invoke","a","b","10"]}'
Args中的第一个参数用于说明调用哪个方法（"invoke"方法），第二个到后面的作为调用对应方法附带的参数，以下是invoke方法代码。
大概意思是：
1、变量A和B用于接收对应第二个和第三个参数的值（为字符串）
2、Aval和Bval作为变量A和B转为int类型的值
3、X是第四个参数（代码中已转为int类型）
4、执行“Aval = Aval - X，Bval = Bval + X”
于是计算过程为：
5、a的初始值为100，b的初始值为200
6、a = 100 - 10 = 90
7、b = 200 + 10 = 210
// Transaction makes payment of X units from A to B
func (t *SimpleChaincode) invoke(stub shim.ChaincodeStubInterface, args []string) pb.Response {
var A, B string // Entities
var Aval, Bval int // Asset holdings
var X int // Transaction value
var err error
if len(args) != 3 {
return shim.Error("Incorrect number of arguments. Expecting 3")
}
A = args[0]
B = args[1]
// Get the state from the ledger
// TODO: will be nice to have a GetAllState call to ledger
Avalbytes, err := stub.GetState(A)
if err != nil {
return shim.Error("Failed to get state")
}
if Avalbytes == nil {
return shim.Error("Entity not found")
}
Aval, _ = strconv.Atoi(string(Avalbytes))
Bvalbytes, err := stub.GetState(B)
if err != nil {
return shim.Error("Failed to get state")
}
if Bvalbytes == nil {
return shim.Error("Entity not found")
}
Bval, _ = strconv.Atoi(string(Bvalbytes))
// Perform the execution
X, err = strconv.Atoi(args[2])
if err != nil {
return shim.Error("Invalid transaction amount, expecting a integer value")
}
Aval = Aval - X
Bval = Bval + X
fmt.Printf("Aval = %d, Bval = %d\n", Aval, Bval)
// Write the state back to the ledger
err = stub.PutState(A, []byte(strconv.Itoa(Aval)))
if err != nil {
return shim.Error(err.Error())
}
err = stub.PutState(B, []byte(strconv.Itoa(Bval)))
if err != nil {
return shim.Error(err.Error())
}
return shim.Success(nil)
}
PS：刚入坑的小白，很多不懂，还请各位大佬多赐教，谢谢！
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