slingr-test-case

This is a demonstration project for Slingr.io test case.

Math web services The requirement is to build a public RESTful API that allows to solve math expressions. So given a math expression a number is returned as response....

Front End: React

Simple calculator interfaces that allows you to select Spring Boot API or Python API and POST/GET methods to calculate the math expression Shows last expressions.

github repository: https://github.com/alesisjoan/slingr-test-case/tree/main/react-math-expresions-ui demo: https://math-calculator-fe.herokuapp.com/

Spring Boot API Rest for Math Services

Simple API rest for evaluating math expressions. Uses net.objecthunter.exp4j to evaluate expressions. requires cache service, see Cache Service (enable environment variable CACHE_HOST)

Usage:

GET

curl -X GET "http://host/expressions?expression=sqrt(2)*2&digits=2" http://host/expressions?expression=sqrt(2)*2&digits=2 Responses 200 OK 400 Invalid input 500 Internal error / Math exception

POST

curl -X POST "http://host/expressions" -H "accept: application/json" -H "Content-Type: application/json" -d "{ \"expression\": \"sqrt(2)*2\", \"digits\": 2}" Responses 200 OK 400 Invalid input 500 Internal error / Math exception

github repository: https://github.com/alesisjoan/slingr-test-case/tree/main/sb-math-services

Python Connexion API Rest for Math Services

Simple API rest for evaluating math expressions. Uses python (safe) eval to evaluate expression. requires cache service, see Cache Service (enable environment variable CACHE_HOST)

Usage:

GET

curl -X GET "http://host/expressions?expression=sqrt(2)*2&digits=2" http://host/expressions?expression=sqrt(2)*2&digits=2 Responses 200 OK 400 Invalid input 500 Internal error / Math exception

POST

curl -X POST "http://host/expressions" -H "accept: application/json" -H "Content-Type: application/json" -d "{ \"expression\": \"sqrt(2)*2\", \"digits\": 2}" Responses 200 OK 400 Invalid input 500 Internal error / Math exception

github repository: https://github.com/alesisjoan/slingr-test-case/tree/main/python-math-services

Cache Services

Simple Cache Service (like Redis) to save MathExpressions (used by both Back End to skip evaluation) and to get last expressions (used by Front End) requires cache service, see Cache Service (enable environment variable CACHE_HOST)

Usage:

GET

Gets the result for an expression curl -X GET "http://host/expressions?expression=sqrt(2)*2" Responses 200 OK 400 Invalid input 500 Internal error / Math exception

PUT

Saves a key/value element in a WeakHashMap (limited to 5825422 elements ~ 200MB) This will be used by Back End to not repeat math expression evaluations curl -X PUT "http://host/expressions" -H "Content-Type: application/json" -d "{ \"key\": \"sqrt(2)*2\", \"value\": \"2.82842712474619\"}" Responses 200 OK 400 Invalid input 500 Internal error / Math exception

GET

Get the last expressions sent by both Backends curl -X GET "http://host//expressions/last" http://host/expressions?expression=sqrt(2)*2&digits=2 Responses 200 OK 400 Invalid input 500 Internal error

github repository: https://github.com/alesisjoan/slingr-test-case/tree/main/redislite-services

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demo: https://math-calculator-fe.herokuapp.com/

contact: [email protected] | https://alesisjoan.github.io