Overview

A cloud function is a piece of code that runs in response to an event, such as an HTTP request, a message from a messaging service, or a file upload. Cloud events are things that happen in your cloud environment. These might be things like changes to data in a database, files added to a storage system, or a new virtual machine instance being created.

Since cloud functions are event-driven, they only run when something happens. This makes them a good choice for tasks that need to be done quickly or that don't need to be running all the time.

For example, you can use a cloud function to:

• automatically generate thumbnails for images that are uploaded to Cloud Storage.

• send a notification to a user's phone when a new message is received in Cloud Pub/Sub.

• process data from a Cloud Firestore database and generate a report.

You can write your code in any language that supports Node.js, and you can deploy your code to the cloud with a few clicks. Once your cloud function is deployed, it will automatically start running in response to events.

This hands-on lab shows you how to create, deploy, and test a cloud function using the Google Cloud console.

What you'll do

• Create a cloud function

• Deploy and test the function

• View logs

Task 1. Create a function

In this step, you're going to create a cloud function using the console.

1. In the console, click the Navigation menu () > Cloud Functions.

2. Click Create function.

3. In the Create function dialog, enter the following values:

Note: A helpful popup may appear to validate the required APIs are enabled in the project. Click the ENABLE button when requested.

You deploy the function in the next section.

Task 2. Deploy the function

1. Still in the Create function dialog, in Source code for Inline editor use the default helloWorld function implementation already provided for index.js.

2. At the bottom, click Deploy to deploy the function.

3. After you click Deploy, the console redirects to the Cloud Functions Overview page.

**Note:**While the function is being deployed, the icon next to it is a small spinner. When it's deployed, the spinner is a green check mark.

Test completed task

Click Check my progress to verify your performed task. If you have completed the task successfully you will be granted an assessment score.

Deploy the function.

Check my progress

Task 3. Test the function

Test the deployed function.

1. In the Cloud Functions Overview page, click on GCFunction.

   

2. On function details dashboard, to test the function click on TESTING.

   

3. In the Triggering event field, enter the following text between the brackets {} and click Test the function.

    "message":"Hello World!"
   

   Copied!content_copy

In the Output field, you should see the message Success: Hello World!

In the Logs field, a status code of 200 indicates success. (It may take a minute for the logs to appear.)

Task 4. View logs

View logs from the Cloud Functions Overview page.

1. Click the blue arrow to go back to the Cloud Functions Overview page.

   

2. Display the menu for your function, and click View logs.

   

   Example of the log history that displays in Query results:

   

   Your application is deployed, tested, and you can view the logs.

   Test the function

   Check my progress

Task 5. Test your understanding

Below are multiple-choice questions to reinforce your understanding of this lab's concepts. Answer them to the best of your abilities.

Cloud Functions is a serverless execution environment for event driven services on Google Cloud.

• True

• False

Which type of trigger is used while creating Cloud Function in the lab?

• Firebase

• Google Cloud Pub/Sub

• Cloud StorageHTTP

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Solution of Lab