Qwiklabs — Perform Foundational Infrastructure Tasks in Google Cloud Challenge Lab

3 min readApr 28, 2021

Step by Step guide to solve this challenge. Can refer my YouTube video https://youtu.be/eJxeGaTBdH0

Task 1 : Create a bucket

Navigation menu -> Storage ->Create Bucket
Name your bucket -> Your GCD Project-ID
Location Type ->Region
Location -> us-east1
Rest all value to default
Create

Check my Progress

Task 2 : Create a Pub/Sub topic

Navigation menu -> Pub/Sub ->Create Topic
Topic ID ->Jooli
Encryption -> default
Create

Check my Progress

Task 3 : Create a Cloud Function.

Navigation menu -> Cloud Functions -> Create function

Name -> CFJooli

Trigger -> Cloud Storage

Event Type -> Finalize/Create

Bucket -> Select bucket you created

Entry point -> thumbnail

In line 15 of index.js replace the text REPLACE_WITH_YOUR_TOPIC ID with the Topic ID you created in task 2.

index.js
/* globals exports, require */
//jshint strict: false
//jshint esversion: 6
“use strict”;
const crc32 = require(“fast-crc32c”);
const gcs = require(“@google-cloud/storage”)();
const PubSub = require(“@google-cloud/pubsub”);
const imagemagick = require(“imagemagick-stream”);

exports.thumbnail = (event, context) => {
const fileName = event.name;
const bucketName = event.bucket;
const size = “64x64”
const bucket = gcs.bucket(bucketName);
const topicName = “Jooli”;
const pubsub = new PubSub();
if ( fileName.search(“64x64_thumbnail”) == -1 ){
// doesn’t have a thumbnail, get the filename extension
var filename_split = fileName.split(‘.’);
var filename_ext = filename_split[filename_split.length — 1];
var filename_without_ext = fileName.substring(0, fileName.length — filename_ext.length );
if (filename_ext.toLowerCase() == ‘png’ || filename_ext.toLowerCase() == ‘jpg’){
// only support png and jpg at this point
console.log(Processing Original: gs://${bucketName}/${fileName});
const gcsObject = bucket.file(fileName);
let newFilename = filename_without_ext + size + '_thumbnail.' + filename_ext;
let gcsNewObject = bucket.file(newFilename);
let srcStream = gcsObject.createReadStream();
let dstStream = gcsNewObject.createWriteStream();
let resize = imagemagick().resize(size).quality(90);
srcStream.pipe(resize).pipe(dstStream);
return new Promise((resolve, reject) => {
dstStream
.on("error", (err) => {
console.log(Error: ${err});
reject(err);
})
.on("finish", () => {
console.log(Success: ${fileName} → ${newFilename});
// set the content-type
gcsNewObject.setMetadata(
{
contentType: 'image/'+ filename_ext.toLowerCase()
}, function(err, apiResponse) {});
pubsub
.topic(topicName)
.publisher()
.publish(Buffer.from(newFilename))
.then(messageId => {
console.log(Message ${messageId} published.);
})
.catch(err => {
console.error('ERROR:', err);
});

});         
  });          
}             
else {              
  console.log(`gs://${bucketName}/${fileName} is not an image I can handle`);                 
}

}
else {
console.log(gs://${bucketName}/${fileName} already has a thumbnail);
}
};

package.json
{
“name”: “thumbnails”,
“version”: “1.0.0”,
“description”: “Create Thumbnail of uploaded image”,
“scripts”: {
“start”: “node index.js”
},
“dependencies”: {
“@google-cloud/storage”: “1.5.1”,
“@google-cloud/pubsub”: “⁰.18.0”,
“fast-crc32c”: “1.0.4”,
“imagemagick-stream”: “4.1.1”
},
“devDependencies”: {},
“engines”: {
“node”: “>=4.3.2”
}
}

Create

use this image
https://storage.googleapis.com/cloud-training/gsp315/map.jpg;
download the image to your machine and then upload that file to your bucket.

To upload image
Navigation menu ->Storage -> Click on the bucket you created
Upload image downloaded
Refresh Bucket -> you will notice thumbnail in the list

Check my Progress