protohackers

Protohackers server programming challenge answers.

Deployment

• install 'flyctl';
• authenticate;
• navigate to the root of the repository;
• allocate dedicated IPv4 address (costs $2/mo): flyctl ips allocate-v4 --app <app name>;
  • without this it is not possible to connect over just TCP, even if an IPv6 address is allocated;
  • here's a blog post over at Tigris that gives away $50 in credits;
  • more information about this requirement here and here;
• deploy: flyctl deploy --dockerfile Dockerfile.<problem name> --ha=false;
  • see problem names under cmd/ directory and here;
• find out currently allocated IP: flyctl ips list.

Important

Any uncommitted changes will also be deployed.

Testing

Locally

• move to problem directory: pushd cmd/<problem name>/

• run tests:

  go test -v
  === RUN   TestProblem
  --- PASS: TestProblem (0.00s)
  PASS
  ok      github.com/usrme/protohackers/cmd/<problem name>    3.138s

• move back to the root of the repository: popd;

• build image: docker build --tag <problem name> -f Dockerfile.<problem name> .;

• run container: docker run -p 5000:5000 <problem name>;

• pass command:

  $ echo "hello world" | nc -w1 localhost 5000
  hello world

Remotely

• deploy;

• pass command:

  $ echo "hello world" | nc -w1 <app name>.fly.dev 5000
  hello world

Note

For testing in the Protohackers page, use the IP from flyctl ips list and pass the port 5000