Sample program 4: Assign and use global variables in functions

This example shows how to modify a global variable within a function. You can then reference the variable in later nodes. The `eventObj.global["transedOrderId"]` variable is a global variable created in the conversation flow. When the function starts, it retrieves all slot nodes from the graph using `slots=eventObj.slotSummary`. The function then checks if `Select Order Intent.order_id` has a value. If a value exists, the function assigns it to the global variable. You can then reference this variable in any node that requires it.

module.exports.handler = function(event, context, callback) { 
  var eventResult = "";
  try {
      var eventObj = JSON.parse(event.toString());

      // add your code here
      /**
      * code block
      **/
      //console.info(null, eventObj.toString());
      var slots = eventObj.slotSummary;
      var slotValue = slots["Select Order Intent.order_id"]||'';
      console.info(null, "slotValue:" + slotValue);
      if (slotValue && slotValue !==''){
        eventObj.global["transedOrderId"] = slotValue; // Assign a value to the global variable here.
      } else {
        eventObj.global["transedOrderId"] = eventObj.environment["orderId"];
      }
      console.log(eventObj.global["transedOrderId"]);
      eventResult = JSON.stringify(eventObj);
      callback(null, eventResult);
  } catch (e) {
      console.error(null, e);
      callback(null, e);
  }
};

Python

# -*- coding: utf-8 -*-
import logging
import json


def handler(event, context):
    logger = logging.getLogger()
    logger.info(event)
    eventObj = json.loads(event)

    slots = eventObj["slotSummary"]
    logger.info(slots)
    slotValue = slots["Select Order Intent.orderId"]

    if  slotValue is not None:
        eventObj["global"]["transedOrderId"] = slotValue;
    else:
        eventObj["global"]["transedOrderId"] = eventObj["environment"]["orderId"];

    return eventObj

JAVA

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONArray;
import com.alibaba.fastjson.JSONObject;

import com.aliyun.fc.runtime.Context;
import com.aliyun.fc.runtime.PojoRequestHandler;

/**
 * Created by weili on 2018/8/2.
 *
 * @author weili
 * @date 2018/08/02
 */
public class FunctionHandler implements PojoRequestHandler<JSONObject, JSONObject> {
    @Override
    public JSONObject handleRequest(JSONObject eventObj, Context context) {

        /**
         *  eventObj structure definition
         *
         *  read-only variables
         *  "environment": "Object",
         *  "lastOutputForFunction": "String",
         *  "slotSummary": "Object",
         *
         *  read/write variables
         *  "global": "Object",
         *  "overrideResponse": "Object",
         *  "functionOutput": "String",
         *  "routeVariable": "String"
         */

        JSONObject slots = eventObj.getJSONObject("slotSummary");
        String slotValue = slots.getString("Select Order Intent.order_id");
        if (null != slotValue && !"".equals(slotValue)) {
            eventObj.getJSONObject("global").get("transedOrderId") = slotValue;
        } else {
            eventObj.getJSONObject("global").get("transedOrderId") = eventObj.getJSONObject("environment").getString("orderId");
        }

        return eventObj;
    }
}

Reference the global variable