Can I invoke a chaincode function from the chaincode itself

Question

I have a chaincode and have a certain number of functions in it. I want to invoke a function that is in the chain code by the chaincode itself. I don’t want to use any external invoking. How can I do it?

Answer 1

Yes, you can invoke a function from the chaincode itself.

The general format to invoke a chaincode is as follows:

stub.InvokeChaincode(chaincodeName, queryArgs, channelName)

But this is used to invoke another chaincode. So if you want to invoke the function by the chaincode itself, you have to modify the above code. If you want to call the chaincode in same channel, leave the channelName parameter empty.

So you can just pass the first two parameters

stub.InvokeChaincode(chaincodeName, queryArgs)

Source: https://github.com/hyperledger/fabric/blob/release/examples/chaincode/go/chaincode_example05/chaincode_example05.go#L90

Comments

Hi @Slayer, I wanted to know if there are any criteria to be able to call a chaincode from another chaincode. I have different hyperledger networks and projects. Some times the chaincode calling another chaincode works and some times it doesn't.

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As much as I know, the chaincode should be installed on each endorsing peer.

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HI @Yash. Another thing I have observed is that if the chaincodes are on different channels, then only read is allowed.

Answer 2

Here's an example on how you can achieve it:

// Invoke
func (am *accountManagement) Invoke(stub shim.ChaincodeStubInterface) peer.Response {
    actionName, params := stub.GetFunctionAndParameters()

    if actionName == "callAnotherCC" {
        chainCodeArgs := util.ToChaincodeArgs("anotherCCFunc", "paramA")
        response := stub.InvokeChaincode("anotherCCName", chainCodeArgs, "channelName")

        if response.Status != shim.OK {
           return shim.Error(response.Message)
        }
        return shim.Success(nil)
    }

    // NOTE: This is an example, hence assuming only valid call is to call another chaincode
    return shim.Error(fmt.Sprintf("[ERROR] No <%s> action defined", actionName))
}