Writing GCP Functions

• There are two types of Cloud Functions
  • HTTP Functions: These are functions which are triggered by HTTP call
  • Event Driven functions:
    • They can be either background functions or Cloud Event Functions
• Background Function:
  • We use background functions when you have your cloud function invoked as a response to event such as message in Pub/Sub topic or change in Cloud storage account
• Cloud Event Function:
  • This is invoked directly in response to events. They are similar to background functions with the following differences
    • Cloud Event functions use an industry standard event format known as Cloud Events
    • CloudFunctions itself invokes Cloud Functions using HTTP requests, which can be reproduced else where

Setting up local dev environment for functions

• Refer Here for setup
• Python:
  • Install the functions-framework

  pip install functions-framework
  

HTTP Functions

• Sample Usage
• Refer Here for the sample code used
• To connect to Cloud SQL from Cloud Functions Refer Here
• Refer Here to use big table with cloud functions
• Try to Create a simple Cloud Function in your favorite language and create a http request

curl -X POST gcpfunctionendpoint -H 'Content-Type:application/json' -d '{"name": "Khaja" }'

• Write a Google cloud function to Shutdown all the vms with specific labels
  • Refer Here for the skeleton in python