Shorten Long URL Using CDK And Serverless

- There are many web apps provide the service of shortening your long url (free or charged). 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: https://github.com/vumdao/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
  
  

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