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Google Cloud Functions Recipes

Cloud Pub/Sub

Overview

This recipe shows you how to publish messages to a Cloud Pub/Sub topic from a Cloud Function. Where applicable:

Replace [PROJECT-ID] with your Cloud Platform project ID

Cooking the Recipe

  1. Follow the Cloud Functions quickstart guide to setup Cloud Functions for your project

  2. Clone this repository

    cd ~/
git clone https://github.com/jasonpolites/gcf-recipes.git
cd gcf-recipes/pubsub

  3. Create a Cloud Pub/Sub topic (if you already have one you want to use, you can skip this step):

    gcloud alpha pubsub topics create gcf-recipes-topic

  4. Create a Cloud Storage Bucket to stage our deployment

    gsutil mb gs://[PROJECT-ID]-gcf-recipes-bucket

  5. Deploy the "publish" function with an HTTP trigger

    gcloud alpha functions deploy publish --bucket [PROJECT-ID]-gcf-recipes-bucket --trigger-http

  6. Deploy the "subscribe" function with the Pub/Sub topic as a trigger

    gcloud alpha functions deploy subscribe --bucket [PROJECT-ID]-gcf-recipes-bucket --trigger-topic gcf-recipes-topic

  7. Call the "publish" function

    gcloud alpha functions call publish --data '{"topic": "gcf-recipes-topic", "message": "Hello World!"}'

  8. Check the logs for the "subscribe" function

    gcloud alpha functions get-logs subscribe

You should see something like this in your console

D      ... User function triggered, starting execution
I      ... Hello World!
D      ... Execution took 1 ms, user function completed successfully

Running Tests

This recipe comes with a suite of unit tests. To run the tests locally, just use npm test

npm install
npm test

The tests will also produce code coverage reports, written to the /coverage directory. After running the tests, you can view coverage with

open coverage/lcov-report/index.html