Example 6: Use external environment variables in dialogue logic-cloud customer service system(CCS)-阿里云帮助中心

In a chat session, the client can pass an environment context to the system. This allows the robot to provide personalized replies. For example, the robot can identify the current user and respond differently to each person. If Peter starts a chat, the robot replies, "Hello, handsome Peter." If Mary starts a chat, the robot replies, "Wow, Mary, you're so pretty." For any other user, such as Jack, the robot replies, "Hi Jack."

Example code

You can pass the environment context through the ext field in the session API. In this example, SENDER_NICK is a field in the ext environment variables. In the code for the user-defined function node, you can retrieve the required environment variable from the environment object using its key.

Node.js

module.exports.handler = function(event, context, callback) {
    /** event structure definition
    {
      // read-only variables
      "environment": "Object",
      "lastOutputForFunction": "String",
      "slotSummary": "Object",

      // read/write variables
      "global": "Object",
      "overrideResponse": "Object",
      "functionOutput": "String",
      "routeVariable": "String"
    }
    **/
    var arr = "";
    var eventResult = "";
    try {
        var eventObj = JSON.parse(event);
        // add your code here
        var userNick = eventObj.environment["SENDER_NICK"];
        if (userNick === 'Peter') {
          eventObj.overrideResponse.htmlText = ["Hello, handsome Peter."];
        } else if (userNick === 'Mary') {
          eventObj.overrideResponse.htmlText = ["Wow, Mary, you're so pretty."];
        } else {
          eventObj.overrideResponse.htmlText = ["Hi " + userNick];
        }
        eventResult = JSON.stringify(eventObj);
        callback(null, eventResult);
    } catch (e) {
        eventResult = JSON.stringify(eventObj);
        callback(null, eventResult);
    }
};

Python

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

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

  environment = eventObj['environment']
  userNick = environment['SENDER_NICK']
  if userNick == 'Peter':
    responseText = 'Hello, handsome Peter.'
  elif userNick == 'Mary':
    responseText = 'Wow, Mary, you\'re so pretty.'
  else:
    responseText = 'Hi ' + userNick

  eventObj['overrideResponse'] = {'htmlText':[responseText]}

  return eventObj

Java

package com.aliyun.openservices.tcp.example.handler;

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;

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 environment = eventObj.getJSONObject("environment");
        String userNick = environment.getString("SENDER_NICK");

        String responseText;
        if (userNick.equals("Peter")) {
            responseText = "Hello, handsome Peter.";
        } else if (userNick.equals("Mary")) {
            responseText = "Wow, Mary, you're so pretty.";
        } else {
            responseText = "Hi " + userNick;
        }

        JSONArray htmlText = new JSONArray();
        htmlText.add(responseText);
        JSONObject overrideResponse = new JSONObject();
        overrideResponse.put("htmlText", htmlText);
        eventObj.put("overrideResponse", overrideResponse);

        return eventObj;
    }
}