Shorten Long URL Using CDK And Serverless

- There are many web apps provide the service of shortening your long url (free or charge). This ariticle introduces the way of using serverless with Cloud development toolkit (CDK)

- CDK helps to create this project by coding (python language), What's its benefits?

+ Infra structure as code

+ Update lambda function code and just need to execute cdk deploy, all the code and modules will be up-to-date

+ Create and destroy the structure quickly, and we can manage the structure by separate stacks such dynamodb stack, IAM stack, lambda stack and API Gateway stack.

What’s In This Document

• Init CDK project
• Create source code
• Deploy stacks
• Demo

🚀 Init CDK project

⚡ $ mkdir shorten-url
⚡ $ cd shorten-url
⚡ $ cdk init -l python

🚀 Create source code

• Source: shorten-url

  ⚡ $ tree
  .
  ├── app.py
  ├── create_src
  │   └── createShortUrl.py
  ├── README.md
  ├── redirect_src
  │   └── redirectUrl.py
  ├── requirements.txt
  ├── setup.py
  ├── shorten_url
  │   ├── __init__.py
  │   └── shorten_url_stack.py
  

• Add python boto3 module for lambda function sources

  ⚡ $ pip install boto3 -t create_src
  ⚡ $ pip install boto3 -t redirect_src
  

• Cdk synth to check cdk valid

  ⚡ $ cdk synth
  Successfully synthesized to ~/shorten-url/cdk.out
  Supply a stack id (ShortenUrlDDB, ShortenUrlIAMRole, ShortenURLCreateLambda, ShortenURLRedirectLambda, ShortenURLApiGW) to display its template.
  

• List stacks

  ⚡ $ cdk ls
  ShortenUrlDDB
  ShortenUrlIAMRole
  ShortenURLCreateLambda
  ShortenURLRedirectLambda
  ShortenURLApiGW
  

🚀 Deploy stacks

⚡ $ cdk deploy '*'

• Full stacks created in cloudformation:

• Lambda functions:

• Lambda function: create url

• Lambda function: redirect url

• API Gateway

🚀 Demo

• POST a long url (here is not actually long)

  ⚡ $ curl -L -X POST 'https://s.cloudopz.co/shortenUrl' -H 'Content-Type: application/json' --data-raw '{"url": "https://hashnode.com/@vumdao"}'
  "{\"short_url\": \"https://s.cloudopz.co/dVkiBRM\"}"
  

• Check dynamodb table

  • Note that I add expiry_date attribute for TTL = 7 days

• Click on the short URL

Project vercel: https://cdk-serverless-shorten-url.vercel.app/ Github Code 👩‍💻 : https://github.com/vumdao/shorten-url

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