Webhook call failed. Error: UNAVAILABLE, State: URL_UNREACHABLE, Reason: UNREACHABLE_5xx, HTTP statu

[NamitaDesai]

I am using Dialogue flow inline editor. I have created cloud function to create an event but its not working and I am receiving following error in diagnostic info. Please help me to Resolve this issue.

Webhook call failed. Error: UNAVAILABLE, State: URL_UNREACHABLE, Reason: UNREACHABLE_5xx, HTTP status code: 500

My code in ndex.js file is as below:

1.  'use strict';
2.  
3.  const functions = require('firebase-functions');
4.  const {google} = require('googleapis');
5.  const {WebhookClient} = require('dialogflow-fulfillment');
6.  
7.  // Enter your calendar ID below and service account JSON below
8.  const calendarId = "My CalenderId";
9.  const serviceAccount = {
10.  My account details
11. }; // Starts with {"type": "service_account",...
12.  
13.  // Set up Google Calendar Service account credentials
14.  const serviceAccountAuth = new google.auth.JWT({
15.    email: serviceAccount.client_email,
16.    key: serviceAccount.private_key,
17.    scopes: 'https://www.googleapis.com/auth/calendar'
18.  });
19.  
20.  const calendar = google.calendar('v3');
21.  process.env.DEBUG = 'dialogflow:*'; // enables lib debugging statements
22.  
23.  const timeZone = 'America/Los_Angeles';
24.  const timeZoneOffset = '-07:00';
25.  
26.  exports.dialogflowFirebaseFulfillment = functions.https.onRequest((request, response) => {
27.    const agent = new WebhookClient({ request, response });
28.    console.log("Parameters", agent.parameters);
29.    const Person_name = agent.parameters.person;
30.    const phone = agent.parameters.phone;
31.    function makeAppointment (agent) {
32.      // Calculate appointment start and end datetimes (end = +1hr from start)
33.      //console.log("Parameters", agent.parameters.date);
34.      const dateTimeStart = new Date(Date.parse(agent.parameters.date.split('T')[0] + 'T' + agent.parameters.time.split('T')[1].split('-')[0] + timeZoneOffset));
35.      const dateTimeEnd = new Date(new Date(dateTimeStart).setHours(dateTimeStart.getHours() + 1));
36.      const appointmentTimeString = dateTimeStart.toLocaleString(
37.        'en-US',
38.        { month: 'long', day: 'numeric', hour: 'numeric', timeZone: timeZone }
39.      );
40.    
41.  
42.      // Check the availibility of the time, and make an appointment if there is time on the calendar
43.      return createCalendarEvent(dateTimeStart, dateTimeEnd, Person_name, phone).then(() => {
44.      function confirmAppointment() {
45.             agent.add(`Ok, let me see if we can fit you in. ${appointmentTimeString} is fine!`);
46.           }
47.         confirmAppointment();
48.      }).catch(() => {
49.        agent.add(`I'm sorry, there are no slots available for ${appointmentTimeString}.`);
50.      });
51.    }
52.  
53.    let intentMap = new Map();
54.    intentMap.set('Schedule Appointment', makeAppointment);
55.    agent.handleRequest(intentMap);
56.  });
57.  function createCalendarEvent(dateTimeStart, dateTimeEnd, Person_name, phone) {
58.     const new_event = {
59.         summary: Person_name + ' Appointment',
60.             description: 'with ' + Person_name +' - '+ phone.toString(), // Convert phone to string
61.             start: { dateTime: dateTimeStart },
62.             end: { dateTime: dateTimeEnd }
63.     };
64.   return new Promise((resolve, reject) => {
65.     calendar.events.list({
66.       auth: serviceAccountAuth, // List events for time period
67.       calendarId: calendarId,
68.       timeMin: dateTimeStart.toISOString(),
69.       timeMax: dateTimeEnd.toISOString()
70.     }, (err, calendarResponse) => {
71.       // Check if there is an event already on the Calendar
72.       if (err || calendarResponse.data.items.length > 0) {
73.         reject(err || new Error('Requested time conflicts with another appointment'));
74.       } else {
75.         // Create event for the requested time period
76.     calendar.events.insert({
77.           auth: serviceAccountAuth,
78.           calendarId: calendarId,
79.           resource: new_event
80.         }, (err, new_event) => {
81.           if (err) {
82.             console.error("Error creating event:", err);
83.           } else {
84.             console.log("Event created successfully:", new_event.id);
85.           }
86.         });                
87.       }
88.     });
89.   });
90. }

[christianpaula]

Hi @NamitaDesai,

Welcome to Google Cloud Community!

You're getting a "UNAVAILABLE" error because your Cloud Function can't reach Google Calendar. Here's how to fix it:

1. Check Network: Make sure your Cloud Function has internet access and no firewalls are blocking Google APIs.
2. Verify Credentials: Double-check your service account details and ensure it has permission to access Google Calendar (scope: https://www.googleapis.com/auth/calendar).
3. Debug Your Code: Use logging and error messages to pinpoint issues during authentication or API calls.
4. Test Manually: Try making a direct API call from your machine to isolate the problem.

Here are additional tips:

• Implement error handling in your code for a better user experience.
• Consider using async/await for cleaner asynchronous handling.
• Maintain good code formatting for readability.