Install chaincode programmatically¶

To install chaincode inside our application, we need to reach out to system chaincode called _lifecycle.

Following piece of code can be taken as a reference:

 1func InstallChaincode(network *client.Network, arguments *lifecycle.InstallChaincodeArgs) (*lifecycle.InstallChaincodeResult, error) {
 2  lifecycleChaincode := network.GetContract("_lifecycle")
 3
 4  argumentsBytes, err := proto.Marshal(arguments)
 5  if err != nil {
 6    return nil, err
 7  }
 8
 9  chaincodesBytes, err := lifecycleChaincode.EvaluateTransaction("InstallChaincode", string(argumentsBytes))
10  if err != nil {
11    return nil, err
12  }
13
14  installedChaincode := new(lifecycle.InstallChaincodeResult)
15  err = proto.Unmarshal(chaincodesBytes, installedChaincode)
16  if err != nil {
17    return nil, err
18  }
19
20  return installedChaincode, nil
21}
Where:

  • lifecycle.InstallChaincodeArgs - protobuf struct that the InstallChaincode chaincode function expects while installing the chaincode (lifecycle package is imported from "github.com/hyperledger/fabric-protos-go-apiv2/peer/lifecycle")

  • lifecycle.InstallChaincodeResult - the return type of InstallChaincode chaincode function

lifecycle.InstallChaincodeArgs has ChaincodeInstallPackage field that we fill with the target chaincode. Take a look at this function usage:

1// ...
2
3arguments := lifecycle.InstallChaincodeArgs{ChaincodeInstallPackage: myChaincodeBytes}
4result, err := InstallChaincode(network, &arguments)
5
6fmt.Printf("Label: %v, Package id: %v", result.Label, result.PackageId)