donhundley / calculator

calculator for dev ops

CALCULATOR APP FOR DEVOPS

DATABASE SCHEMA

CREATE TABLE calculations
(
id SERIAL PRIMARY KEY,
n1 DOUBLE PRECISION NOT NULL,
n2 DOUBLE PRECISION NOT NULL,
operation CHAR(1) NOT NULL,
result DOUBLE PRECISION NOT NULL,
calculated_at TIMESTAMP NOT NULL DEFAULT NOW()
);

CONNECTION STRING

docker-compose.yml requires a connection string, this application has been designed with use of elephantSQL in mind. Therefore, Utilities.cs may need to be altered if a different source is used.

DOCKER-COMPOSE

As this application is built with the idea of being a console based calculator, docker-compose is not great for that. In order to use the calculator as intended, the command

docker-compose run mycalculator

instead of the normal usage, being docker-compose up

App in a container

navigate to the app directory in the console and input docker build -t calculator .

The -t option is used to tage the image and the period at the end instructs docker to user the file in the current directory. Next run:

docker run -it -e "pgconn={YOUR CONNECTION STRING} --name calc calculator

A breakdown of this command: -it is for running the container in interactive mode -e is setting environment variables --name {container name} {image name}

App without docker

This application can also be used without docker. Navigate to the app directory and set your connection string with the command

export pgconn={YOUR CONNECTION STRING HERE} and

dotnet run in the console and it will work there as well!

ENJOY THE MATH!