go-calculator

Go Calculator

A simple web application in Go which accepts math problems via the URL and returns the response in JSON.

By default, HTTP server runs on port 8080.

There are four endpoints, one for each basic math operation:

• add
• subtract
• multiply
• divide

All endpoints accept GET requests with two query string parameters: x and y.

Results are cached for 1 minute.

How to run

go run main.go

Run tests

go test

Request

Response

The HTTP server returns JSON response containing following fields:

• action - requested math operation
• x - first number for math operation
• y - second number for math operation
• answer - result of math operation
• cached - is cached result returned

Example:

{
    "action": "divide",
    "answer": 3,
    "x": 9,
    "y": 3,
    "cached": true
}

Test with curl

Request:

curl "http://localhost:8080/add?x=4&y=3"

Response:

{"action":"add","answer":7,"x":4,"y":3,"cached":true}

Dockerize web application

docker build -t calcserver .
docker run -p 8080:8080 calcserver