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Week 8 — Serverless Image Processing

Implement CDK stack

Create a new directory

Create a new directory in the top level directory which will contain all the cdk pipeline content

cd /workspace/aws-bootcamp-cruddur-2023
mkdir thumbing-serverless-cdk

Install CDK globally

This is so we can use the AWS CDK CLI for anywhere.

npm install aws-cdk -g

We'll add the the install to our gitpod task file

  - name: cdk
    before: |
      npm install aws-cdk -g

Initialize a new project

We'll initialize a new cdk project within the folder we created:

cdk init app --language typescript

Create env.example file and install the dotenv package

touch .env.example
npm install dotenv

Create s3 bucket to store assets

Manually create a S3 bucket named, assests.<domain_name> for serving processed images in the profile.

Update Env variables

export DOMAIN_NAME=faithkoviproject.store
gp env DOMAIN_NAME=faithkoviproject.store
export UPLOADS_BUCKET_NAME=faithkoviproject-cruddur-uploaded-avatars
gp env UPLOADS_BUCKET_NAME=faithkoviproject-cruddur-uploaded-avatars

Image processing

To process the uploaded images, create a lambda function

mkdir -p aws/lambdas/process-images
cd aws/lambdas/process-images
touch index.js s3-image-processing.js test.js  example.json
npm init -y
npm install sharp @aws-sdk/client-s3

Ensure it works by running the following commands

cd /workspace/aws-bootcamp-cruddur-2023
mkdir -p bin/avatar
cd bin/avatar
touch build upload clear
chmod u+x build upload clear
mkdir files

Ensure sharp dependency works

./bin/avatar/build
cd thumbing-serverless-cdk

Stacks

Update the stacks to create the following: S3 bucket, Lambda, SNS topic, SNS subscription, S3 event notification to SNS, S3 event notification to Lambda, policy for bucket access, policy for publishing, Attach the policies to the Lambda role.

Bootstrapping

Deploying stacks with the AWS CDK requires dedicated Amazon S3 buckets and other containers to be available to AWS CloudFormation during deployment.

cdk bootstrap "aws://$AWS_ACCOUNT_ID/$AWS_DEFAULT_REGION"

Build

We can use build to catch errors prematurely. This jsut builds tyescript

npm run build

Synth

the synth command is used to synthesize the AWS CloudFormation stack(s) that represent your infrastructure as code.

cdk synth

Deploy

cdk deploy

List Stacks

cdk ls

Serve assets via Cloudfront

Create a cloudfront distribution by setting the origin domain to be assets.<domain_name> Use the ACM created previously as the Custom SSL certificate Ensure a record is created in Route53 assets.<domain_name> with an alias pointing to the cloudfront distribution.

Update/Create codes for the profile page implementation

update the necessary codes for the profile page implementation

Database migration

Database migration is required since previously there was no column named bio Run the script

./bin/generate/migration add_bio_column

After Creating the executable scripts bin/db/migrate and bin/db/rollback, run the scripts To migrate

./bin/db/migrate

To roll back

./bin/db/rollback

Implement HTTP API Gateway using a lambda authorizer

Create an API gateway with its invoke URL having this format - https://<API_ID>.execute-api.<AWS_REGION>.amazonaws.com To successfully implement this:

Implement a ruby function to generate a presigned URL

  • Create a basic function.rb in aws/lambdas/cruddur-upload-avatar/ and run bundle init; edit the Gemfile that was generated and run bundle install and bundle exec ruby function.rb afterwards; a presigned url can be generated for testing. The code function.rb displays the actual function.rb utilized in CruddurAvatarUpload.
  • In aws/lambdas/lambda-authorizer/, make index.js, run npm introduce aws-jwt-check - - save, Download everything in this folder and zip it, then upload it to the lambda function CruddurApiGatewayLambdaAuthorizer

Testing

Run the following commands in the terminal

cd /workspace/aws-bootcamp-cruddur-2023
./bin/bootstrap
docker compose up
./bin/prepare

Proof

Proof