Event triggered functions in GCP - Mini Project: Build & Apply

Deploying a Google Cloud Function Triggered by Cloud Storage Events

📖 Scenario: You work for a company that stores images in Google Cloud Storage. You want to automatically process images whenever a new file is uploaded to a storage bucket.To do this, you will create a Google Cloud Function that triggers when a new file is added to a specific Cloud Storage bucket.

🎯 Goal: Build a Google Cloud Function that triggers on new file uploads to a Cloud Storage bucket named image-uploads. The function will log the file name and bucket name.

📋 What You'll Learn

Create a Cloud Storage bucket named image-uploads.

Create a Cloud Function named log_new_file triggered by new file creation in the image-uploads bucket.

The function should log the file name and bucket name from the event data.

Deploy the function with the correct trigger and runtime.

💡 Why This Matters

🌍 Real World

Automating tasks like image processing or data ingestion when files are uploaded to cloud storage is common in many businesses.

💼 Career

Cloud engineers and developers often create event-driven functions to build scalable, reactive cloud applications.

1

Create the Cloud Storage bucket

Write the gsutil command to create a Cloud Storage bucket named image-uploads in the us-central1 region.

GCP

# Your command here

Need a hint?

Use gsutil mb -l REGION gs://BUCKET_NAME/ to create a bucket.

2

Write the Cloud Function code

Create a Python function named log_new_file that accepts event and context parameters. Inside the function, assign file_name to event['name'] and bucket_name to event['bucket']. Then, write a log statement using print that outputs: New file {file_name} uploaded to {bucket_name}.

GCP

def log_new_file(event, context):
    # Your code here

Need a hint?

Use event['name'] and event['bucket'] to get file and bucket names.

3

Configure the Cloud Function trigger

Write the gcloud command to deploy the Cloud Function named log_new_file using Python 3.9 runtime. Set the trigger to activate on new object creation events in the image-uploads bucket.

GCP

def log_new_file(event, context):
    file_name = event['name']
    bucket_name = event['bucket']
    print(f"New file {file_name} uploaded to {bucket_name}")

# Your deployment command here

Need a hint?

Use --trigger-event google.storage.object.finalize for new file uploads.

4

Verify the Cloud Function trigger configuration

Write the gcloud command to describe the Cloud Function log_new_file and confirm it is triggered by the image-uploads bucket on new object creation events.

GCP

def log_new_file(event, context):
    file_name = event['name']
    bucket_name = event['bucket']
    print(f"New file {file_name} uploaded to {bucket_name}")

gcloud functions deploy log_new_file --runtime python39 --trigger-resource image-uploads --trigger-event google.storage.object.finalize

# Your verification command here

Need a hint?

Use gcloud functions describe FUNCTION_NAME to check configuration.