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Exercise 6: Posting customer interactions to Slack

Add a lambda function to react to secret deal codes

Now for an advaned excercise...

  • Add a /secret?code=<user-input> endpoint to the deals service
  • Hook up the button in the frontend, e.g. via JQuery, to present a user prompt
  • Enhance the deal service to call a lambda/fission function whenever the correct secret code was entered
  • Write a lambda/fission function that reports this happy day to Slack

Hooking up the button

You might want to add an onclick handler to the appropriate button in topbar.html (don't do this at home...) and/or add a corresponding function in public/js/client.js and/or public/js/front.js. A $.ajax() Ajax call via JQuery should do the trick. Don't forget to also add another action in api/deals/index.js.

Now let's rebuild the frontend image, tagged with a new version:

docker build -t 12-factor-workshop/front-end:v3 .

Adjust the front-end-dep.yml we created earlier to reference the new image tag and run

kubectl apply -f front-end-dep.yml

(hint: there's a front-end.patch file in show-random-deal/ that can act as a source of inspiration)

Add a deals endpoint in the deals service.

This is essentially the same as the default endpoint, so we can do some copy&paste to get started. It should additionally receive a code parameter that is then checked.

Writing and installing the "Lambda" function

Lets write a lambda function that triggers a Slack Webhook. You can use this webhook here: https://hooks.slack.com/services/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

To see the webhook in action, register in 12-factor-workshop.slack.com

Once you have written the JavaScript function, create it in fission:

# only once needed
fission env create --name nodejs --image fission/node-env

# create the function
fission function create --name slackPost --env nodejs --code slackPost.js

# define a route for it
fission route create --method GET --url /slackPost --function slackPost

Try it out manually via curl. If it works, try it in the web app.

Add a HTTP call to the deals service

The call needs to trigger the router endpoint of fission. This is automatically available as router.fission within kubernetes, so the full URL to the function is:

http://router.fission/slackPost

Source of inspiration can be taken from the serverless/ directory. You might want to rebuild the image as v5

docker build -t 12-factor-workshop/deals:v5 .

And change the image property of the deals-dep.yaml again before issuing

kubectl apply -f deals-dep.yaml