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Google Cloud Functions Pub

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

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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 beta pubsub topics create YOUR_TOPIC_NAME

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

  4. Deploy the publish function with an HTTP trigger:

    cd publish/ gcloud functions deploy publish --trigger-http --runtime YOUR_RUNTIME

    • Replace YOUR_RUNTIME with the name of the runtime you are using. For a complete list, see the gcloud reference.

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

    cd subscribe/ gcloud functions deploy subscribe --trigger-topic YOUR_TOPIC_NAME --runtime YOUR_RUNTIME

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

  6. Call the publish function:

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

  7. Check the logs for the subscribe function:

    gcloud functions logs read 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