chaincode.go

/*
Copyright IBM Corp. All Rights Reserved.

SPDX-License-Identifier: Apache-2.0
*/

// This program is an erroneous chaincode program that attempts to put state in query context - query should return error
package example03

import (
	"fmt"
	"strconv"

	"github.com/hyperledger/fabric/core/chaincode/shim"
	pb "github.com/hyperledger/fabric/protos/peer"
)

// SimpleChaincode example simple Chaincode implementation
type SimpleChaincode struct{}

// Init takes a string and int. These are stored as a key/value pair in the state
func (t *SimpleChaincode) Init(stub shim.ChaincodeStubInterface) pb.Response {
	var A string // Entity
	var Aval int // Asset holding
	var err error
	_, args := stub.GetFunctionAndParameters()
	if len(args) != 2 {
		return shim.Error("Incorrect number of arguments. Expecting 2")
	}

	// Initialize the chaincode
	A = args[0]
	Aval, err = strconv.Atoi(args[1])
	if err != nil {
		return shim.Error("Expecting integer value for asset holding")
	}
	fmt.Printf("Aval = %d\n", Aval)

	// Write the state to the ledger - this put is legal within Run
	err = stub.PutState(A, []byte(strconv.Itoa(Aval)))
	if err != nil {
		return shim.Error(err.Error())
	}

	return shim.Success(nil)
}

// Invoke is a no-op
func (t *SimpleChaincode) Invoke(stub shim.ChaincodeStubInterface) pb.Response {
	function, args := stub.GetFunctionAndParameters()
	if function == "query" {
		return t.query(stub, args)
	}

	return shim.Error("Invalid invoke function name. Expecting \"query\"")
}

func (t *SimpleChaincode) query(stub shim.ChaincodeStubInterface, args []string) pb.Response {
	var A string // Entity
	var Aval int // Asset holding
	var err error

	if len(args) != 2 {
		return shim.Error("Incorrect number of arguments. Expecting 2")
	}

	A = args[0]
	Aval, err = strconv.Atoi(args[1])
	if err != nil {
		return shim.Error("Expecting integer value for asset holding")
	}
	fmt.Printf("Aval = %d\n", Aval)

	// Write the state to the ledger - this put is illegal within Run
	err = stub.PutState(A, []byte(strconv.Itoa(Aval)))
	if err != nil {
		jsonResp := "{\"Error\":\"Cannot put state within chaincode query\"}"
		return shim.Error(jsonResp)
	}

	return shim.Success(nil)
}