总目录:
(一)HyperLedger Fabric 2.0-release测试网络部署
(二)Fabric2.0 first-network 生成配置说明
(三)Fabric2.0启动网络脚本配置剖析
(四)Fabric2.0通道实践
(五)Fabric2.0 智能合约实践- 安装以及定义智能合约
(六)Fabric2.0 智能合约实践- 升级智能合约
(七)Fabric2.0智能合约实践-设置背书策略
智能合约背书策略用来定义交易是否合法的判断条件,策略以主体的形式表示。主体格式为’MSP.ROLE’, MSP代表所要求的MSPID, ROLE表示角色,一共有四种合法角色:member, admin, client, peer。
2. 背书策略语法背书策略的语法如下:
EXPR(E[, E…])
EXPR可以是AND、OR、OutOf,E可以是一个上面示例的主体或者是另一个嵌套的EXPR策略。示例如下:
AND(‘Org1.member’, ‘Org2.member’, ‘Org3.member’) :要求三个主体中每一个主体都要签名。
OR(‘Org1.member’, ‘Org2.member’) :要求三个主体中至少有一个主体签名。
OR(‘Org1.member’, AND(‘Org2.member’, ‘Org3.member’)):要求同时有主体Org1.member的签名,以及主体Org2.member与Org3.member中至少一个主体的签名。
OutOf(2, ‘Org1.member’, ‘Org2.member’, ‘Org3.member’) :要求三个主体中,至少有两个主体签名。
fabric2.0智能合约设置背书策略得方式主要有两种,一种是通过提交合约的时候设置,我们称之为合约级别的背书策略,一种是直接通过合约动态设置,我们称之为键级别背书策略。
3.1 合约级别背书策略设置所谓合约级别背书策略,就是在这个合约的交易都必须遵循这个策略,在默认情况下,即不设置背书策略,合约的背书策略为majority of channel members,过半数通道成员。
输入以下命令设置合约级别背书策略
背书策略"OR(‘Org1.member’, ‘Org2.member’)" 组织1成员或者组织2成员背书即满足
peer lifecycle chaincode approveformyorg --signature-policy "OR('Org1MSP.member','Org2MSP.member')" --tls true --cafile /opt/gopath/src/github.com/hyperledger/fabric/peer/crypto/ordererOrganizations/example.com/orderers/orderer.example.com/msp/tlscacerts/tlsca.example.com-cert.pem --channelID mychannel --name mycc --version 1 --init-required --package-id mycc_1:4ad799ccef18d596f8c175fe1849cadc63f92a5efb1e7332712fbb2827a2ec6f --sequence 2 --waitForEvent
–signature-policy:设置背书策略
出现以下错误:
Error: proposal failed with status: 500 - failed to invoke backing implementation of 'ApproveChaincodeDefinitionForMyOrg': currently defined sequence 3 is larger than requested sequence 2
序列号不是当前合约序列号,只需要改成最新的序号即可,假如是这里,sequence值改成3即可
Error: proposal failed with status: 500 - failed to invoke backing implementation of 'ApproveChaincodeDefinitionForMyOrg': attempted to redefine uncommitted sequence (4) for namespace mycc with unchanged content
存在当前最新的合约没有commit,无法进行新的approve,只需要将最新的commit后再进行这次新的approve即可。
切换节点重复命令,知道满足lifecycle策略
假如在操作上都approve成功了,还是出现以下情况:
我的实践是直接先commit,commit成功就可以继续走
每次调用完approve之后,必须commit才能起效。
控制台输入以下命令
peer lifecycle chaincode commit -o orderer.example.com:7050 --tls true --cafile /opt/gopath/src/github.com/hyperledger/fabric/peer/crypto/ordererOrganizations/example.com/orderers/orderer.example.com/msp/tlscacerts/tlsca.example.com-cert.pem --channelID mychannel --name mycc --peerAddresses peer0.org1.example.com:7051 --tlsRootCertFiles /opt/gopath/src/github.com/hyperledger/fabric/peer/crypto/peerOrganizations/org1.example.com/peers/peer0.org1.example.com/tls/ca.crt --peerAddresses peer0.org2.example.com:9051 --tlsRootCertFiles /opt/gopath/src/github.com/hyperledger/fabric/peer/crypto/peerOrganizations/org2.example.com/peers/peer0.org2.example.com/tls/ca.crt --version 1 --sequence 2 --init-required --signature-policy "OR('Org1MSP.member','Org2MSP.member')"
控制台输出以下结果表示成功
此时查询a的值为90
3.1.3 验证背书策略3.2设置的背书策略为组织1成员或者组织2成员背书即满足,
此时指定背书节点为peer0.org1.example.com
peer chaincode invoke -o orderer.example.com:7050 --tls true --cafile /opt/gopath/src/github.com/hyperledger/fabric/peer/crypto/ordererOrganizations/example.com/orderers/orderer.example.com/msp/tlscacerts/tlsca.example.com-cert.pem -C mychannel -n mycc --peerAddresses peer0.org1.example.com:7051 --tlsRootCertFiles /opt/gopath/src/github.com/hyperledger/fabric/peer/crypto/peerOrganizations/org1.example.com/peers/peer0.org1.example.com/tls/ca.crt -c '{"Args":["invoke","a","b","10"]}'
控制台输出如下:
重新查询a的值为80,更新成功
将背书策略修改为 “AND(‘Org1MSP.member’,‘Org2MSP.member’)”
peer lifecycle chaincode approveformyorg --signature-policy "AND('Org1MSP.member','Org2MSP.member')" --tls true --cafile /opt/gopath/src/github.com/hyperledger/fabric/peer/crypto/ordererOrganizations/example.com/orderers/orderer.example.com/msp/tlscacerts/tlsca.example.com-cert.pem --channelID mychannel --name mycc --version 1 --init-required --package-id mycc_1:4ad799ccef18d596f8c175fe1849cadc63f92a5efb1e7332712fbb2827a2ec6f --sequence 3 --waitForEvent
peer lifecycle chaincode commit -o orderer.example.com:7050 --tls true --cafile /opt/gopath/src/github.com/hyperledger/fabric/peer/crypto/ordererOrganizations/example.com/orderers/orderer.example.com/msp/tlscacerts/tlsca.example.com-cert.pem --channelID mychannel --name mycc --peerAddresses peer0.org1.example.com:7051 --tlsRootCertFiles /opt/gopath/src/github.com/hyperledger/fabric/peer/crypto/peerOrganizations/org1.example.com/peers/peer0.org1.example.com/tls/ca.crt --peerAddresses peer0.org2.example.com:9051 --tlsRootCertFiles /opt/gopath/src/github.com/hyperledger/fabric/peer/crypto/peerOrganizations/org2.example.com/peers/peer0.org2.example.com/tls/ca.crt --version 1 --sequence 3 --init-required --signature-policy "AND('Org1MSP.member','Org2MSP.member')"
同样只设置peer0.org1.example.com节点,重新invoke,查看节点日志结果如下:
ERRO 0ed VSCC error: stateBasedValidator.Validate failed, err validation of endorsement policy for chaincode mycc in tx 15:0 failed: signature set did not satisfy policy
不满足背书策略,因为我们已经重新设置为"AND(‘Org1MSP.member’,‘Org2MSP.member’)"
接下来,我们通过设置键级别背书策略的方法,将上面操作完成
3.2 键级别背书策略设置键级别的背书策略是通过智能合约内部调用SDK完成
shim包提供了以下的函数设置或者恢复键对应的背书策略。下面的ep代表是“endorsement policy”的缩写。
对于私有数据,以下功能适用:
Go shim提供了扩展功能,允许链码开发人员根据组织的MSP标识符来处理认可策略
根据官方给的说明
假如需要两个特定组织来批准key更改,设置key的背书策略,请将两个org都传递MSPIDs给AddOrgs(),然后调用Policy()构造可以传递给的认可策略字节数组SetStateValidationParameter()
接下来我们进行实践
首先导入相关依赖包
新增function 设置背书策略
endorsement具体实现如下:
由于新增了引入包,先下载依赖
进入合约目录输入以下命令
go mod vendor
3.2.2 升级合约
参考
Fabric2.0 智能合约实践- 升级智能合约
设置a的背书策略为 AND(“Org1MSP.member”,“Org2MSP.member”)
peer chaincode invoke -o orderer.example.com:7050 --tls true --cafile /opt/gopath/src/github.com/hyperledger/fabric/peer/crypto/ordererOrganizations/example.com/orderers/orderer.example.com/msp/tlscacerts/tlsca.example.com-cert.pem -C mychannel -n mycc --peerAddresses peer0.org1.example.com:7051 --tlsRootCertFiles /opt/gopath/src/github.com/hyperledger/fabric/peer/crypto/peerOrganizations/org1.example.com/peers/peer0.org1.example.com/tls/ca.crt --peerAddresses peer0.org2.example.com:9051 --tlsRootCertFiles /opt/gopath/src/github.com/hyperledger/fabric/peer/crypto/peerOrganizations/org2.example.com/peers/peer0.org2.example.com/tls/ca.crt -c '{"Args":["endorsement","a","Org1MSP","add"]}'
peer chaincode invoke -o orderer.example.com:7050 --tls true --cafile /opt/gopath/src/github.com/hyperledger/fabric/peer/crypto/ordererOrganizations/example.com/orderers/orderer.example.com/msp/tlscacerts/tlsca.example.com-cert.pem -C mychannel -n mycc --peerAddresses peer0.org1.example.com:7051 --tlsRootCertFiles /opt/gopath/src/github.com/hyperledger/fabric/peer/crypto/peerOrganizations/org1.example.com/peers/peer0.org1.example.com/tls/ca.crt --peerAddresses peer0.org2.example.com:9051 --tlsRootCertFiles /opt/gopath/src/github.com/hyperledger/fabric/peer/crypto/peerOrganizations/org2.example.com/peers/peer0.org2.example.com/tls/ca.crt -c '{"Args":["endorsement","a","Org2MSP","add"]}'
查看peer日志,交易成功
只设置peer0.org1节点作为背书节点
peer chaincode invoke -o orderer.example.com:7050 --tls true --cafile /opt/gopath/src/github.com/hyperledger/fabric/peer/crypto/ordererOrganizations/example.com/orderers/orderer.example.com/msp/tlscacerts/tlsca.example.com-cert.pem -C mychannel -n mycc --peerAddresses peer0.org1.example.com:7051 --tlsRootCertFiles /opt/gopath/src/github.com/hyperledger/fabric/peer/crypto/peerOrganizations/org1.example.com/peers/peer0.org1.example.com/tls/ca.crt -c '{"Args":["addTen","a"]}'
查看节点日志如下,提示不满足策略,因为前面设置的是AND(“Org1MSP.member”,“Org2MSP.member”)
修改背书策略,删除Org2MSP
peer chaincode invoke -o orderer.example.com:7050 --tls true --cafile /opt/gopath/src/github.com/hyperledger/fabric/peer/crypto/ordererOrganizations/example.com/orderers/orderer.example.com/msp/tlscacerts/tlsca.example.com-cert.pem -C mychannel -n mycc --peerAddresses peer0.org1.example.com:7051 --tlsRootCertFiles /opt/gopath/src/github.com/hyperledger/fabric/peer/crypto/peerOrganizations/org1.example.com/peers/peer0.org1.example.com/tls/ca.crt --peerAddresses peer0.org2.example.com:9051 --tlsRootCertFiles /opt/gopath/src/github.com/hyperledger/fabric/peer/crypto/peerOrganizations/org2.example.com/peers/peer0.org2.example.com/tls/ca.crt -c '{"Args":["endorsement","a","Org2MSP","del"]}'
修改成功
重新执行以下命令:
peer chaincode invoke -o orderer.example.com:7050 --tls true --cafile /opt/gopath/src/github.com/hyperledger/fabric/peer/crypto/ordererOrganizations/example.com/orderers/orderer.example.com/msp/tlscacerts/tlsca.example.com-cert.pem -C mychannel -n mycc --peerAddresses peer0.org1.example.com:7051 --tlsRootCertFiles /opt/gopath/src/github.com/hyperledger/fabric/peer/crypto/peerOrganizations/org1.example.com/peers/peer0.org1.example.com/tls/ca.crt -c '{"Args":["addTen","a"]}'
修改a值从110变成120,执行成功
经过实践,合约的approve跟commit是明显有问题的,会出现approve完成后,checkcommit还是false,但是最终还是可以commit成功的情况,这时候只要commit成功就行了。以上这一点是比较需要注意的。Fabric2.0灵活的背书策略配还是可以的,需要chaincode源码留下评论。