Table of Contents

1. Challenge

   Enable Required APIs

   1. Use the API Library to find and enable the Cloud Pub/Sub API.
   2. Use the API Library to find and enable the Cloud Functions API.
   3. Use the API Library to find and enable the Cloud Build API.
2. Challenge

   Create Pub/Sub Topic

   1. From the main console navigation, go to Cloud Pub/Sub (Now found under Analytics, Pub/Sub)
   2. Click Create a topic.
   3. In the dialog, enter a name greetings for the topic.
   4. Click Create.
3. Challenge

   Create a Cloud Function

   1. From the main console, go to Cloud Functions.
   2. Click Create function.
   3. Configure the function with the following values:
      • Name: acg-pubsub-function
      • Trigger: Cloud Pub/Sub
      • Topic: [Topic just created]
   4. Click Save.
   5. Make sure to expand out the "Runtime, build, connections and security settings" section, and set the "Maximum number of instances" to 1.
   6. Click Next.
      • Runtime: Python 3.9
      • Source code: Inline editor
   7. In the main.py field, enter the following code:

   import base64
   
   def greetings_pubsub(data, context):
   
       if 'data' in data:
           name = base64.b64decode(data['data']).decode('utf-8')
       else:
           name = 'folks'
       print('Greetings {} from Linux Academy!'.format(name))
   

   6. Set Entry Point to greetings_pubsub.
   7. Click Deploy.
4. Challenge

   Publish Message to Topic From Console

   1. Click the newly created Cloud Function name.
   2. Switch to Trigger.
   3. Click the topic link to go to the Cloud Pub/Sub topic.
   4. From the Topic page, click Publish Message.
   5. In the Message field, enter everyone around the world.
   6. Click Publish.
5. Challenge

   Confirm Cloud Function Execution

   1. Return to the Cloud Functions dashboard.
   2. Click the Cloud Function's name.
   3. From the Cloud Function navigation, click Logs.
   4. Locate the most recent log.
   5. Confirm function execution.
6. Challenge

   Trigger Cloud Function Directly From Command Line

   1. Open the Projects dialog and copy the current project ID.

   2. Click Activate Cloud Shell from the top row of the console.

   3. In the Cloud Shell, enter the following code: gcloud config set project [PROJECT_ID]

   4. Next, enter the following code:

       DATA=$(printf 'my friends' | base64)
       gcloud functions call acg-pubsub-function --data '{"data":"'$DATA'"}'
      

   5. After a moment, refresh the logs page and confirm the Cloud Function execution.

7. Challenge

   Publish Message to Topic From Command Line

   1. In the Cloud Shell, enter the following command:

       gcloud pubsub topics publish greetings --message "y'all"
      

   2. After a moment, refresh the log page to confirm the function has executed.