Fulfillment error occurred when trying to test google action in voice assistant

Question

I'm trying to create a webhook that will get the Intent and current state, change the state, and send back a reply using actions-on-google library for node.js.

index.js is as follows:

'use strict';

const {dialogflow} = require('actions-on-google');
const functions = require('firebase-functions');
const app = dialogflow({debug: true});

app.intent('welcome', conv => {
  let replyState = setReplyState( conv, 'prompt' );
  let intent = getIntentName( conv );
  sendReply( conv, intent, replyState );
});


function getReplyState( conv ){
  return conv.data['replyState'];
}

function setReplyState( conv, state ){
  conv.data['replyState'] = state;
  return state;
}

function getIntentName( conv ){
  return conv.intent;
}

const welcomeReplies = [
  "Welcome!"
];


const allReplies = {
  welcome: welcomeReplies,
};

function sendReply( conv, intent, replyState ){

  let repliesNamed = replyState;
  let replies = allReplies[repliesNamed];
  conv.add( reply );
}

exports.fulfillment = functions.https.onRequest(action);

package.json is as follows:

{
  "scripts": {
    "serve": "firebase serve --only functions",
    "shell": "firebase functions:shell",
    "start": "npm run shell",
    "deploy": "firebase deploy --only functions",
    "logs": "firebase functions:log"
  },
  "engines": {
        "node": "8"
      },
  "dependencies": {
    "firebase-admin": "~6.0.0",
    "firebase-functions": "^2.0.3",
    "actions-on-google": "~2.5.0"
  },
  "private": true
}

Error occurred:

MalformedResponse Failed to parse Dialogflow response into AppResponse because of invalid platform response: Could not find a RichResponse or SystemIntent in the platform response for agentId: ab93fe46-9eb1-4a6c-aea7-1699d67d7369 and intentId: 1ec758db-d03a-40b7-85fe-189d9245e6e2.

I referred https://github.com/afirstenberg/examples/tree/master/conversation-to-code-2-aog

Answer 1

You don't show the function execution log, but it looks like action isn't defined anywhere, so the call functions.https.onRequest(action); returns an error.

In the source you're working from, action is defined as

const action = dialogflow();

and all the Intent Handlers are registered with

action.intent(...)

While you have a similar definition

const app = dialogflow({debug: true});

so you can probably change the line that defines the function to

exports.fulfillment = functions.https.onRequest(app);

to resolve your immediate problem.