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URL shortener

This is an example of how to create a URL shortener using:

  • go-swagger as api Framework (OpenAPI 2.0)

  • swagger-ui as frontend to publish documentation and provide a way to test APIs

  • The apis logic need storage, that is passed as an interface to make easier change it

    • "github.com/boltdb/bolt" has been chosen as implementation since it is a quick key-value db

  • prometheus is used to expose metrics under /metrics.

  • dependencies are managed through go mod

  • redirection is performed before hitting the API in the middleware

  • error management is present but covers only most common cases

The code NOT autogenerated is included in the following packages/files:

  • storage package (logic of storage)
  • middlewares package (logic to redirect, prometheus)
  • url_implementation package (logic of APIs)
  • restapi/operation/configure_url_shortener.go file (linking pieces)
  • swagger-ui/swagger.yml file (open-api definition, used to auto-generate the code)

The code autogenerated is NOT covered by tests, everything else has a coverage of ~ 80%

image

Development:

To add new Api modify swagger-ui/swagger.yml and run:

$swagger generate server -f ./swagger-ui/swagger.yml --exclude-main

Be aware, if you modify any autogenerated file it will be overwritten running such command.

Run test running: $go test ./...

Usage

To execute the server clone the repo, cd into it and run:

$go run ./cmd/url-shortener-server/main.go --port 35307

Navigate to localhost:35307/swagger-ui to visualise the UI and test APIs with a frontend Navigate to localhost:35307/metrics to check metrics, in particular url_redirected keeps track of redirection since last execution

There are three methods under /api:

  • POST /api/url that accept in the json body the URL to make shorter
  • GET /api/url/{shortURL} that returns the URL corresponding to shortURL
  • DELETE /api/url/{shortURL} that delete the URL

Shortened URLs will be like short-abcdefghil and can be used as follows localhost:35307/short-abcdefghil

If you try to navigate to a shortened url that does not exist (es: localhost:35307/short-notExisting) you will be redirected to http://www.notfound.com