CAMMANDS-LINE

gcloud is the command-line tool for Google Cloud. It comes pre-installed on Cloud Shell and supports tab-completion.

You can list the active account name with this command:

gcloud auth list

You can list the project ID with this command:

gcloud config list project

Create a function

To create a cloud function:
In the Cloud Shell command line, create a directory for the function code.

mkdir gcf_hello_world

Move to the gcf_hello_world directory.

cd gcf_hello_world

Create and open index.js to edit.

nano index.js

Copy the following into the index.js file

/**
* Background Cloud Function to be triggered by Pub/Sub.
* This function is exported by index.js, and executed when
* the trigger topic receives a message.
*
* @param {object} data The event payload.
* @param {object} context The event metadata.
*/

Exit nano (Ctrl+x) and save (Y) the file.


exports.helloWorld = (data, context) => {
const pubSubMessage = data;
const name = pubSubMessage.data
    ? Buffer.from(pubSubMessage.data, 'base64').toString() : "Hello World";
console.log(`My Cloud Function: ${name}`);
};

Create a cloud storage bucket
Use the following command to create a new cloud storage bucket for your function:

gsutil mb -p [PROJECT_ID] gs://[BUCKET_NAME]

PROJECT_ID is the Project ID in the connection details of this lab


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

Deploy your function
When deploying a new function, you must specify --trigger-topic, --trigger-bucket, or --trigger-http. When deploying an update to an existing function, 
the function keeps the existing trigger unless otherwise specified.

For this lab, you'll set the --trigger-topic as hello_world.

Deploy the function to a pub/sub topic named hello_world, replacing [BUCKET_NAME] with the name of your bucket:

gcloud functions deploy helloWorld \
  --stage-bucket [BUCKET_NAME] \
  --trigger-topic hello_world \
  --runtime nodejs8

If prompted, enter Y to allow unauthenticated invocations of a new function.

Verify the status of the function.

gcloud functions describe helloWorld

An ACTIVE status indicates that the function has been deployed.

entryPoint: helloWorld
eventTrigger:
  eventType: providers/cloud.pubsub/eventTypes/topic.publish
  failurePolicy: {}
  resource:
...
status: ACTIVE
...

Test Completed Task
Click Check my progress to verify your performed task. If you have completed the task successfully you will receive an assessment score.