Get all the objects (marble) names in the ledger

marbles_all_names.go

//Shows all the marbles or objects in the ledger (blockchain)
//This is a marbles chaincode (hyperledger fabric samples) related code.
// Jasti Sri Radhe Shyam

func (t *SimpleChaincode) getMarblesByRangeAll(stub shim.ChaincodeStubInterface) pb.Response {
  //Gets all the data with undefined range
	resultsIterator, err := stub.GetStateByRange("", "")
	if err != nil {
		return shim.Error(err.Error())
	}
	defer resultsIterator.Close()

	// buffer is a JSON array containing QueryResults
	var buffer bytes.Buffer
	buffer.WriteString("[")

	bArrayMemberAlreadyWritten := false
	for resultsIterator.HasNext() {
		queryResponse, err := resultsIterator.Next()
		if err != nil {
			return shim.Error(err.Error())
		}
		// Add a comma before array members, suppress it for the first array member
		if bArrayMemberAlreadyWritten == true {
			buffer.WriteString(",")
		}
		buffer.WriteString("\"")
		buffer.WriteString(queryResponse.Key)
		buffer.WriteString("\"")
		bArrayMemberAlreadyWritten = true
	}
	buffer.WriteString("]")

	fmt.Printf("- getMarblesByRange queryResult:\n%s\n", buffer.String())

	return shim.Success(buffer.Bytes())
}