❱ reduc.io ❰

URL shortener service http://reduc.io/wuXaq

Tech stack

• Scala
• Akka Http
• Circe
• Redis
• ScalaTest
• Specs2
• Mockito
• Gatling

Alternative solutions

We could use following short code gen also:

substr(base62(md5(url)), 6) = 62 ^ 6 //unique short urls

Commands

Run

Run docker-compose, it will start api, redis and will expose api port to host.

docker-compose up

Sample usage

# Shorten
curl -i http://localhost:9001 -F "url=https://www.amazon.com/Star-Wars-Battlefront-II-Digital/dp/B072JZZ4XD"

# Call shortened url
for ((i=1;i<=100;i++)); do curl -i "http://localhost:9001/SEwuXHhBQw"; done

# Get Stats
curl -i "http://localhost:9001/stats/?url=https://www.amazon.com/Star-Wars-Battlefront-II-Digital/dp/B072JZZ4XD"

# returns: {"callCount":100}

Create executable

sbt packageBin

Test

sbt test

Gatling Simulation

Simulation users count can be set in application.conf in test resources.

# terminal 1
sbt run

# Run simulation in terminal 2
sbt gatling:test gatling:latestReport

Coverage with Report

sbt clean coverage test coverageReport

Improvements

• Seperate read and write API's
• Move statistics to different data store and API
• Add DB support by having write master/replicas and have read replicas
• Move hit counts to MapReduce job and generate them from the Web Server logs
• Implement Authentication using JWT authentication protocol with OAuth2 authentication framework
• API Documentation using swagger or similar
• Add Host denyList
• Add Retry policies for Redis calls using Retry or similar one
• Add Throttling using akka-http-contrib
• Add Metrics support using akka-http-metrics

z i λ a s a l.