RPSSL - Rock-Paper-Scissors-Spock-Lizard is a simple but famous game for 2 players. Usually it's played with your own hands, in first person, but this is the web version.
The web version uses the Comet technique which is a long running HTTP request that can be used for immediate server push of data to the client.
Each http request is a separate Erlang process. We can leave it to block forever, holding the connection open, since it's using very little resources.
Comet-RPSSL uses mochiweb as a http server. If you don't already have it installed in the Erlang library path, you can use the git submodule:
git submodule init
git submodule update
make mochiweb
Now you can compile and run Comet-RPSSL:
make
erl -pa ebin/ -pa deps/mochiweb/ebin
webserver:start([9999]).
For a quick test without a browser, run the following commands in two separate terminals:
curl -d attack=rock http://localhost:9999/test/attack
curl -d attack=scissors http://localhost:9999/test/attack
You will notice how the first one blocks until the second one plays, and then both are immediately released.
The code is MIT licensed.