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System Design Choices

Goals

  • Service should generate a shortened link when given a URL
  • User should be redirected to original link when given a shortened link
  • User can pick a custom shortened url
  • Links will expire after a certain time period.
  • Minimal latency when happening in real time
  • Caching a percentage of the links for faster access times

Assumptions

  • Assume a lot more read access than writing to database
  • Not going to be that many people using this app.

Database Design

  • Choosing to use Redis Database for fast access and caching.

Algorithm Choices

  • Base 62 Encoding for a randomized number generator (can lead to replicating issues)

To Test Program:

docker-compose up --build

Example command of POST to redis db

curl -L -X POST 'localhost:8080/encode' \         
-H 'Content-Type: application/json' \
--data-raw '{
    "url": "https://www.example.com",
    "expires": "2022-10-04 17:18:00"
}'

Example command of GET from redis db

curl -L -X GET "http://localhost:8080/ZNkw23qpiss"