Go Calculator

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

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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

Operation	Example
add	http://localhost:8080/add?x=2&y=2
subtract	http://localhost:8080/subtract?x=7&y=4
multiply	http://localhost:8080/multiply?x=6&y=5
divide	http://localhost:8080/divide?x=9&y=3

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