pubsub

Google Cloud Functions Pub/Sub sample

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

View the source code.

Deploy and Test

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

2. Clone this repository:

    git clone https://github.com/GoogleCloudPlatform/nodejs-docs-samples.git
    cd nodejs-docs-samples/functions/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 [YOUR_TOPIC_NAME]
   

   • Replace [YOUR_TOPIC_NAME] with the name of your Pub/Sub Topic.

4. Create a Cloud Storage Bucket to stage our deployment:

    gsutil mb gs://[YOUR_BUCKET_NAME]
   

   • Replace [YOUR_BUCKET_NAME] with the name of your Cloud Storage Bucket.

5. Deploy the publish function with an HTTP trigger:

    gcloud alpha functions deploy publish --bucket [YOUR_BUCKET_NAME] --trigger-http
   

   • Replace [YOUR_BUCKET_NAME] with the name of your Cloud Storage Bucket.

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

    gcloud alpha functions deploy subscribe --bucket [YOUR_BUCKET_NAME] --trigger-topic [YOUR_TOPIC_NAME]
   

   • Replace [YOUR_BUCKET_NAME] with the name of your Cloud Storage Bucket.
   • Replace [YOUR_TOPIC_NAME] with the name of your Pub/Sub Topic.

7. Call the publish function:

    gcloud alpha functions call publish --data '{"topic":"[YOUR_TOPIC_NAME]","message":"Hello World!"}'
   

   • Replace [YOUR_TOPIC_NAME] with the name of your Pub/Sub Topic.

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