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Perform Foundational Infrastructure Tasks in Google Cloud: Challenge Lab [GSP315]




Link to the video: https://youtu.be/ypbGzTmMUb4

STEPS

Task 1

Go to cloud storage

Make a bucket with the bucket name given <Bucket Name>


Task 2

GO TO PUB/SUB 

Name = <Topic Name>


Task 3

GO TO CLOUD FUNCTIONS

create cloud functions

name = <Cloud Function Name>

region = us-east1

Trigger type = cloud storage

Event type = Finalize/create

Select the bucket you made earlier

done

next

entry point = thumbnail


index.js:


/* globals exports, require */

//jshint strict: false

//jshint esversion: 6

"use strict";

const crc32 = require("fast-crc32c");

const { Storage } = require('@google-cloud/storage');

const gcs = new 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 = "REPLACE_WITH_YOUR_TOPIC ID";

  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/pubsub": "^2.0.0",

    "@google-cloud/storage": "^5.0.0",

    "fast-crc32c": "1.0.4",

    "imagemagick-stream": "4.1.1"

  },

  "devDependencies": {},

  "engines": {

    "node": ">=4.3.2"

  }

}



Download this image: https://storage.googleapis.com/cloud-training/gsp315/map.jpg  

put it in your bucket after deployment of cloud function


GO TO IAM

remove username 2




Congratulations You have completed the Challenge Lab!

SAKURA SATIO



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