Bdtjtk

I have a scenario where I need to call a some other(say query) function from a chaincode function (say update). Does hyperledger fabric provide any interface for this.
Eg:

   ...

    async query(stub, args) {

    }

    async update(stub, args) {

      if(condition) {

        call query();

      }

    }

    ...

I have tried the answer on following post but it did't work.
how to invoke chaincode function from itself to record sub transactions.
Though by using invokeChaincode() I am able to call function from another chaincode.

Thanks in advance.

Chaincode code:

    let Chaincode = class {



    async Init(stub) {

        return shim.success();

    }



    async Invoke(stub) {



        let ret = stub.getFunctionAndParameters();



        console.info(ret);



        let method = this[ret.fcn];



        if (!method) {

            throw new Error('Received unknown function ' + ret.fcn + ' invocation');

        }

        try {

            let payload = await method(stub, ret.params);

            return shim.success(payload);

        } catch (err) {

            return shim.error(err);

        }

    }



    async init(stub, args) {



        if (args.length != 1) {

            throw new Error('Invalid args. Expects no args');

        }

    }



    async query(stub, args) {

        ...

    }



    async dummy(stub, args) {

        return Buffer.from('Hello');

    }





    async update(stub, args) {

    ...

        let resp = await dummy(); // gives error

        //let resp = await stub.invokeChaincode('cc2', ['dummy'] );  // working

        console.log(resp)

    ...

    }    

};

shim.start(new Chaincode());

As a alternative approach I am installing and instantiating same chaincode with two names say cc1 and cc2 on same channel say ch1. Then I am using:

 invokeChaicode('cc2', ['function', 'arg1', arg2]);

from chaincode one (cc1).

But the problem is I need to install and instantiate same chaincode twice with different names on same channel.

Any other insights are welcome.

Sometimes we should think it more simple.Well, the answer is: call it directly.
For example:
we got two functions A and B

func (s *SmartContract) A(APIstub shim.ChaincodeStubInterface, args string) sc.Response {}

func (s *SmartContract) B(APIstub shim.ChaincodeStubInterface, args string) sc.Response {}

if we want to call function A within function B,just do it as

func (s *SmartContract) B(APIstub shim.ChaincodeStubInterface, args string) sc.Response {



 s.A(APIstub,args)



}