无法在DialogFlow和Google动作中发出API请求。 尚未设定回应

Question

I'm trying to make a API request using actions-on-google and dialogflow, but after the call has been resolved, the conv.ask does not count as a final response i guess.

My code:

 const functions = require('firebase-functions'); const {dialogflow,Permission} = require('actions-on-google'); const request = require('request'); const rp = require('request-promise-native'); const fetch = require('node-fetch'); const app = dialogflow(); const API_URL = "https://pokeapi.co/api/v2/pokemon/1/"; app.intent('CriarLista - produtos - yes', (conv) => { conv.data.requestedPermission = 'DEVICE_PRECISE_LOCATION'; return conv.ask(new Permission({ context: 'Para te localizar', permissions: conv.data.requestedPermission, })); }); app.intent('CriarLista - location_permission', (conv, params, permissionGranted) => { if (permissionGranted) { const {requestedPermission} = conv.data; if (requestedPermission === 'DEVICE_PRECISE_LOCATION') { const {coordinates} = conv.device.location; if (coordinates) { let lat = coordinates.latitude; let long = coordinates.longitude; fetch(API_URL).then(function(res) { let data = res.json(); }).then(function(data) { conv.ask('Test'); }).catch(function(err) { console.log(err); }); } else { return conv.close('Sorry, I could not figure out where you are.'); } } } else { return conv.close('Sorry, permission denied.'); } }); exports.dialogflowFirebaseFulfillment = functions.https.onRequest(app); 

Errors: actions-on-google response:

{
  "responseMetadata": {
    "status": {
      "code": 10,
      "message": "Failed to parse Dialogflow response into AppResponse because of empty speech response",
      "details": [
        {
          "@type": "type.googleapis.com/google.protobuf.Value",
          "value": "{\"id\":\"74f26d40-869c-4ccb-9d75-1473f42e9aee\",\"timestamp\":\"2018-10-06T15:33:01.004Z\",\"lang\":\"pt-br\",\"result\":{},\"status\":{\"code\":206,\"errorType\":\"partial_content\",\"errorDetails\":\"Webhook call failed. Error: 500 Internal Server Error\"},\"sessionId\":\"ABwppHEUqmeurK1aqRe3QRDCo2BrPyZOu4cI447He8ZgA882v72AICpeqPCyzHEA6QCKTeo4cn4CzIZ9ACozv15L\"}"
        }
      ]
    }
  }
}

Firebase console:

FetchError: request to https://pokeapi.co/api/v2/pokemon/1/ failed, reason: getaddrinfo EAI_AGAIN pokeapi.co:443

Error: No response has been set. Is this being used in an async call that was not returned as a promise to the intent handler?

Says that i need to return a promise, i guess a "resolve" method, but i tried even making my promise and it does not work, the "then" from the fetch method is already a resolve method returned from a promise. I tried node-fetch, request, request-promise-native..

Running only the conv.ask outside the fetch block works normally after deploying to firebase.

There is a right way of doing external requests in DialogFlow/actions-on-google environment?

Answer 1

You need to return the promise object so the webhook knows to wait until the promise is completed.

Since fetch() already returns a Promise (as do all the .then() calls after it, since that's how one typically uses a Promise), you just need to return that promise. So you can change the line to

            return fetch(API_URL).then(function(res) {
                let data = res.json();
            }).then(function(data) {
                conv.ask('Test');
            }).catch(function(err) {
                console.log(err);
            });