Let’s get a quick overview of Google Cloud Functions & Google Cloud Run from an GCP certification perspective. We will look at important certification questions regarding Cloud Functions and Cloud Run

You will learn

• What is Cloud Functions & Cloud Run?
• Why it is important and how to set it up?
• Commands Cheatsheet

Google Cloud Functions

Cloud Functions

• Imagine you want to execute some code when an event happens?
  • A file is uploaded in Cloud Storage
  • An error log is written to Cloud Logging
  • A message arrives to Cloud Pub/Sub
• Enter Cloud Functions
  • Serverless compute service offered by GCP
  • Run code in response to events
    • Write your business logic in Node.js, Python, Go, Java, .NET, and Ruby
    • Don’t worry about servers or scaling or availability (only worry about your code)
  • Pay only for what you use
    • Number of invocations
    • Compute Time of the invocations
    • Amount of memory and CPU provisioned
  • Time Bound - Default 1 min and MAX 9 minutes(540 seconds)
  • Each execution runs in a separate instance
    • No direct sharing between invocations

AppEngine vs Cloud Functions

• Both are Serverless compute services
• App Engine is best suited for
  • An application consists of multiple services/components
  • Like Web UI, Rest API’s, Business Logic Services
  • These components together make up an Application
  • Helps to treat such applications as single unit
• Cloud Functions is best suited for
  • An action to happen based on some events in GCP
  • These actions are individual actions and should be managed independent
  • Cloud Functions allows to decouple events handling

Cloud Functions - Concepts

• Event : Upload object to cloud storage
• Trigger: Respond to event with a Function call
  • Trigger - Which function to trigger when an event happens?
  • Functions - Take event data and perform action?
• Events are triggered from
  • Cloud Storage
  • Cloud Pub/Sub
  • HTTP POST/GET/DELETE/PUT/OPTIONS
  • Firebase
  • Cloud Firestore
  • Stack driver logging

Example Cloud Function - HTTP - Node.js

const escapeHtml = require('escape-html');

/**
 * HTTP Cloud Function.
 *
 * @param {Object} req Cloud Function request context.
 *                     More info: https://expressjs.com/en/api.html#req
 * @param {Object} res Cloud Function response context.
 *                     More info: https://expressjs.com/en/api.html#res
 */
exports.helloHttp = (req, res) => {
  res.send(`Hello ${escapeHtml(req.query.name || req.body.name || 'World')}!`);
};

Example Cloud Function - Pub/Sub - Node.js

/**
 * 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} message The Pub/Sub message.
 * @param {object} context The event metadata.
 */
exports.helloPubSub = (message, context) => {
  const name = message.data
    ? Buffer.from(message.data, 'base64').toString()
    : 'World';

  console.log(`Hello, ${name}!`);
};

Cloud Functions - From the Command Line

Cloud Functions - Remember

• No Server Management: You dont need to worry about scaling or availability of your function
• Cloud Functions automatically spin up and back down in response to events
  • They scale horizontally!
• Cloud Functions are recommended for responding to events:
  • Cloud Functions are NOT ideal for long running processes
    • Time Bound - Default 1 min and MAX 9 minutes(540 seconds)

Cloud Run & Cloud Run for Anthos

• Cloud Run - “Container to Production in Seconds”
  • Built on top of an open standard - Knative
  • Fully managed serverless platform for containerized applications
    • ZERO infrastructure management
    • Pay-per-use (For used CPU, Memory, Requests and Networking)
• Fully integrated end-to-end developer experience:
  • No limitations in languages, binaries and dependencies
  • Easily portable because of container based architecture
  • Cloud Code, Cloud Build, Cloud Monitoring & Cloud Logging Integrations
• Anthos - Run Kubernetes clusters anywhere
  • Cloud, Multi Cloud and On-Premise
• Cloud Run for Anthos: Deploy your workloads to Anthos clusters running on-premises or on Google Cloud
  • Leverage your existing Kubernetes investment to quickly run serverless workloads

Cloud Run - From the Command Line