Fallback Handler

Introduction

When a bot receives an input message that it can’t understand, it will reply with a message configured in the Fallback handler function. If you wish to customize the default response message to give a reply of your own, you can configure the fallback handler function based on your bot’s specific needs.

In addition to the system defined input arguements of an Execution function, the Fallback Handler function includes a custom argument called the userInput of String datatype, that stores the latest response from the user in the current chat session. The Fallback handler function returns a map whose structure is similar to the return map of an Execution function.

To learn more about defining handler functions in Deluge, please refer to this page.

If you have chosen your development platform to be Functions, you can use the below listed sample codes for the Java, Node.js and Python stacks :

Java

    

        
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import org.json.JSONObject;
import java.io.*;
import java.util.logging.Logger;

public class FallbackHandler {
    Logger LOGGER = Logger.getLogger(FallbackHandler.class.getName());
    public JSONObject handleFallbackRequest(JSONObject reqBody) throws Exception{
        JSONObject jsonResponse = new JSONObject();
        LOGGER.info("Fallback Handler : : TODO : "+ reqBody.get("todo"));
        jsonResponse.put("message", "Fallback Response: Please define this question and try again");
        return jsonResponse;
    }
}

    

Node.js

    

        
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import logger from "./logger.js";

// Handle the fallback functionality
export default function handleFallback() {
  logger.info('Handling fallback request');
  return {
    "message": "Fallback Response: Please define this question and try again"
  };
}

    

Python

    

        
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import logging
def handle_fallback_request():
    #   This is your Fallback Response Handler. 
    #   You need to write the Fallback Response when the bot doesnt know what to respond to users. 
    #   The way to return fallback message is to be returned is as follows : 
    #       {
    #        'message': 'Fallback Response: Please define this question and try again'
    #       }
    #   Sample code to set the same is available Below.
    logging.info('Handling fallback request')
    return {
        'message': 'Fallback Response: Please define this question and try again'
    }