Cloud Functions - Cloud Storage Trigger¶

Step-01: Introduction¶

Create Cloud Storage Bucket
Create Cloud Function with Cloud Storage Events Trigger

Step-02: Create Cloud Storage Bucket¶

Go to Cloud Storage -> CREATE
Name your bucket: mycfdemobucket1021 (Should be unique in google cloud)
REST ALL LEAVE TO DEFAULTS
Click CREATE

Step-03: Create Cloud Function with Cloud Storage Event Trigger¶

Go to Cloud Functions -> CREATE

1. Configuration Tab¶

Environment: 2nd gen
Function name: cf-demo3-events-storage
Region: us-central1
Trigger: Cloud Storage
Event Type: google.cloud.storage.object.v1.finalized (Object created or updated)
BUCKET: mycfdemobucket1021

Click on MORE OPTIONS and review the settings

# Warning message
Service account(s) might not have enough permissions to deploy the function with selected trigger. To mitigate potential errors, you can grant them the following roles:
roles/eventarc.eventReceiver to 1057267725005-compute@developer.gserviceaccount.com

# Add role
Click on GRANT ALL

REST ALL LEAVE TO DEFAULTS
Click to NEXT

2. Code Tab¶

Runtime: Nodejs20 (default as on today)
LEAVE THE AUTO-POPULATED CODE AS-IS.

JUST REVIEW THE CODE and Click on DEPLOY

const functions = require('@google-cloud/functions-framework');

// Register a CloudEvent callback with the Functions Framework that will
// be triggered by Cloud Storage.
functions.cloudEvent('helloGCS', cloudEvent => {
  console.log(`Event ID: ${cloudEvent.id}`);
  console.log(`Event Type: ${cloudEvent.type}`);

  const file = cloudEvent.data;
  console.log(`Bucket: ${file.bucket}`);
  console.log(`File: ${file.name}`);
  console.log(`Metageneration: ${file.metageneration}`);
  console.log(`Created: ${file.timeCreated}`);
  console.log(`Updated: ${file.updated}`);
});

Step-04: Review Cloud Function Logs¶

Go to Cloud Function -> cf-demo2-events-storage -> Logs

Step-05: Cloud Storage: Upload New File¶

Go to Cloud Storage -> Upload a file -> myfile1.txt
Go to Cloud Function -> cf-demo2-events-storage -> Logs

Step-06: Cloud Storage: Upload updated file¶

Go to Cloud Storage -> Upload a file -> myfile1.txt
Go to Cloud Function -> cf-demo2-events-storage -> Logs