Using promises in async function

Question

I'm trying to listen for a Stripe webhook call, then carry out some actions such as sending an email. My site is on Netlify and I've adapted some code I found in a tutorial:

This works locally, but not when I run it as a Netlify function (basically a lambda). Basically, the part from "client.getSpace.." doesn't appear to run at all. I suspect this is something to do with using these .then promises within an async function, but I'm not sure.

require('dotenv').config();
     const stripe = require('stripe')(process.env.STRIPE_SECRET_KEY);
    
     const contentful = require('contentful-management');
     const client = contentful.createClient({
      accessToken: 
    process.env.CONTENTFUL_CONTENT_MANAGEMENT_ACCESS_TOKEN
    });
    
    var postmark = require("postmark");
    var serverToken = process.env.POSTMARK_SERVER_TOKEN;
    var postmark_client = new postmark.ServerClient(serverToken);
    
    exports.handler = async ({ body, headers }) => {
    try {
      const stripeEvent = stripe.webhooks.constructEvent(
        body,
        headers['stripe-signature'],
        process.env.STRIPE_WEBHOOK_SECRET
      );
    
      if (stripeEvent.type === 'checkout.session.completed') {
       console.log('confirm checkout session completed');
        const eventObject = stripeEvent.data.object;
        const entryId = eventObject.client_reference_id;
        let email = "";
        let secret = "";
    
      client.getSpace(process.env.WEBSITE_CONTENTFUL_SPACE_ID)
       .then(space => space.getEnvironment('master'))
          .then(environment => environment.getEntry(entryId))
          .then(entry => {
           entry.fields.paymentStatus['en-GB'] = 'Paid';
           email = entry.fields.email['en-GB'];
           return entry.update();
          })
          .then(entry => entry.publish())
       .then(entry => postmark_client.sendEmailWithTemplate({
              "From": "x@test.com",
              "To": email,
              "TemplateId": 12345678,
              "TemplateModel": {
                  "abc": "xyz"
               }
            }))
          .catch(console.error)
    
      }
    
      return {
        statusCode: 200,
        body: JSON.stringify({ received: true }),
      };
      } catch (err) {
      console.log(`Stripe webhook failed with ${err}`);
    
      return {
        statusCode: 400,
        body: `Webhook Error: ${err.message}`,
      };
    }
    };

That `client.getSpace()` chain runs asynchronously, *after* you return a status code. Maybe netlify kills the environment when the handler returns? — Bergi, Apr 29 '20 at 09:44
@Bergi - no, I didn't. All the examples I have for this (Contentful API) code use the then syntax. How would that look? — neetso, Apr 29 '20 at 09:48
@Bergi - as to your second question, I was wondering that myself but the code in the if statement is run ... I confirmed that with console.log('confirm checkout session completed'); — neetso, Apr 29 '20 at 09:50

score 0 · Answer 1 · answered Jan 10 '21 at 14:31

For what it's worth to you and anyone else who comes across this question. I had a similar issue using NextJS on Vercel. I rewrote the .then syntax using async/await and the problem seems to be solved, so far. I'm no expert, but I think in this case you would begin by replacing

  client.getSpace(process.env.WEBSITE_CONTENTFUL_SPACE_ID)
    .then(space => space.getEnvironment('master'))

with something like

       const send = await client.getSpace(process.env.WEBSITE_CONTENTFUL_SPACE_ID)
       const getEnvironment = await space.getEnvironment('master')

so on and so forth. I'm not sure how you would rewrite everything else, or if this will even help, but it put me back on track.

Using promises in async function

1 Answers1