Function readJSON

11_app_dev/chaincode_example03.go:388–400

(ctx contractapi.TransactionContextInterface, key string, target interface{})

}

func readJSON(ctx contractapi.TransactionContextInterface, key string, target interface{}) error {
	data, err := ctx.GetStub().GetState(key)
	if err != nil {
		return fmt.Errorf("failed to read %s: %w", key, err)
	}
	if data == nil {
		return fmt.Errorf("state %s does not exist", key)
	}
	if err := json.Unmarshal(data, target); err != nil {
		return fmt.Errorf("failed to decode %s: %w", key, err)
	}
	return nil
}

func putJSON(ctx contractapi.TransactionContextInterface, key string, value interface{}) error {
	data, err := json.Marshal(value)