Cows and Bulls game in Elixir with Cowboy as REST API layer

More info about the game: https://en.wikipedia.org/wiki/Bulls_and_Cows

Run it

mix deps.get
mix run --no-halt

API examples

Try to guess computer's number:

curl -v --data '{"number": 1763}' -H "Content-type: application/json" http://localhost:8080/player/ask
{"bulls":0,"cows":2}

Look up computer's inquiry towards you:

curl http://localhost:8080/computer/ask
{"inquiry":5403}

Answer computer's inquiry:

curl --data '{"bulls": 1, "cows": 0}' -H "Content-type: application/json" http://localhost:8080/player/answer
{"result":"continue"}

Game's log:

curl  http://localhost:8080/
{"log":[{"number":[5,4,0,3],"answer":{"bulls":1,"cows":0},"actor":"computer"},{"number":[1,7,6,3],"answer":{"bulls":0,"cows":2},"actor":"player"}],"actor_at_turn_to_ask":"player"}

Cheating

If you run the application in interactive mode with iex -S run mix then you can inspect the state of the ComputerResponder which holds the computer's number by doing :sys.get_state(CowsAtRest.Game.ComputerResponder).