how to get session id on webhook

Question

I'm making assistant app for google home and Android mobile assistant

I'm using action-on-google library on webhook which is recommended and handy

in my specific case I want to make userEntity from webhook which requires Session Id but I am unable to get the sessionid on webhook

according to api.ai document it sends Json to webhook like this:

{
    "lang": "en", 
    "status": {
        "errorType": "success", 
        "code": 200
    }, 
    "timestamp": "2017-02-09T16:06:01.908Z", 
    "sessionId": "1486656220806"              <<<<<<<<======here is session id
    "result": {
        "parameters": {
            "city": "Rome", 
            "name": "Ana"
        }, 
        "contexts": [], 
        "resolvedQuery": "my name is Ana and I live in Rome", 
        "source": "agent", 
        "score": 1.0, 
        "speech": "", 
        "fulfillment": {
            "messages": [
                {
                    "speech": "Hi Ana! Nice to meet you!", 
                    "type": 0
                }
            ], 
            "speech": "Hi Ana! Nice to meet you!"
        }, 
        "actionIncomplete": false, 
        "action": "greetings", 
        "metadata": {
            "intentId": "9f41ef7c-82fa-42a7-9a30-49a93e2c14d0", 
            "webhookForSlotFillingUsed": "false", 
            "intentName": "greetings", 
            "webhookUsed": "true"
        }
    }, 
    "id": "ab30d214-f4bb-4cdd-ae36-31caac7a6693", 
    "originalRequest": {
        "source": "google", 
        "data": {
            "inputs": [
                {
                    "raw_inputs": [
                        {
                            "query": "my name is Ana and I live in Rome", 
                            "input_type": 2
                        }
                    ], 
                    "intent": "assistant.intent.action.TEXT", 
                    "arguments": [
                        {
                            "text_value": "my name is Ana and I live in Rome", 
                            "raw_text": "my name is Ana and I live in Rome", 
                            "name": "text"
                        }
                    ]
                }
            ], 
            "user": {
                "user_id": "PuQndWs1OMjUYwVJMYqwJv0/KT8satJHAUQGiGPDQ7A="
            }, 
            "conversation": {
                "conversation_id": "1486656220806", 
                "type": 2, 
                "conversation_token": "[]"
            }
        }
    }
}

and ofcourse it is sending it correctly but on webhook we handover the request object to action-on-google and it returns an object with a bunch of methods like ask, askWithCarousel, askWithList and etc (documented here)

the problem is that there is not method to get conversation id documented then how do i get that session id:

my source code for reference:

/index.ts

import * as admin from 'firebase-admin';
import * as functions from 'firebase-functions';
import { Request, Response } from "express"; //interfaces
const ActionsSdkApp = require('actions-on-google').ApiAiAssistant;

import db from '../db';

// API.AI Action names
import {
    inputWelcome
} from './actions'

const WELCOME_INTENT = 'input.welcome';

export const webhook = functions.https.onRequest(async (request: Request, response: Response) => {

    console.log("request.body: ", request.body);
    console.log("request.body.sessionId: ", request.body.sessionId);

    const app = new ActionsSdkApp({ request: request, response: response });

    let actionMap = new Map();
    actionMap.set(WELCOME_INTENT, inputWelcome);
    app.handleRequest(actionMap);
})//end of webhook http trigger

/actions/index.ts

import * as request from 'request';

export function inputWelcome(app: any) {

    //I WANT SESSION ID HERE

    console.log("app.conversation(): ", app.conversation());
    console.log("app.AppRequest: ", app.AppRequest);
    console.log("app.AppRequest.conversation: ", app.AppRequest.conversation);

    console.log("app.AppRequest(): ", app.AppRequest());
    console.log("app.AppRequest().conversation: ", app.AppRequest().conversation);


    console.log("app.getUser().accessToken;: ", app.getUser().accessToken)
    const accessToken = app.getUser().accessToken;

// MAKE USER ENTITY WITH THESE DATA:
//    {
//     "sessionId": "current conversation id here",
//     "entities": [
//         {
//             "name": "option1",
//             "entries": [
//                 {
//                     "value": "option1",
//                     "synonyms": [
//                         "first",
//                         "option one"
//                     ]
//                 }
//             ]
//         },
//         {
//             "name": "option2",
//             "entries": [
//                 {
//                     "value": "option2",
//                     "synonyms": [
//                         "second one",
//                         "second option"
//                     ]
//                 }
//             ]
//         },
//         {
//             "name": "option3",
//             "entries": [
//                 {
//                     "value": "option3",
//                     "synonyms": [
//                         "third one",
//                         "third option"
//                     ]
//                 }
//             ]
//         },
//         {
//             "name": "help",
//             "entries": [
//                 {
//                     "value": "help",
//                     "synonyms": [
//                         "help",
//                         "need help",
//                         "ditn't get",
//                         "need support"
//                     ]
//                 }
//             ]
//         }
//     ]
// }
//
// AND THEN ASK THE USER WITH SUGGESTION CHIPS    

    app.ask(app.buildRichResponse()
       .addSimpleResponse({
            speech: `Hi you can start with these things`,
            displayText: `Hi you can start with these things`
        })
        .addSuggestions(['option1', 'option2', 'option3', 'Help'])                        
    )
}

Answer 1

support person said that:

Hi,

Thank you for your interest in Actions on Google. If you are using nodejs for your webhook, you should be able to access the sessionId with request.body.sessionId. You can store that value in a variable and use it at later stages in the function.

Kind Regards

Jean-Charles, Actions on Google Support Team