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Development

See TILES.md for some details and useful routes for tile development.

See Developing on Windows to get setup on Windows

Droplet configuration

If configuring the droplet from scratch, these are the requirements:

  • docker
  • docker-compose
  • make
  • this repo (via git clone)

Docker

Start the Docker stack for this project:

make

To ensure a rebuild of one or more of the containers, this make task will add --build to the docker-compose up command that is run by the default task:

make dev_up_b

To start the stack with production config, run:

make prod_up

As with dev, make prod_up_b will add --build to the compose command ran by make prod_up.

To update the code on the server with the latest master and rerun docker-compose up --build:

make prod_deploy

Make code changes, and within a few seconds the app should restart. Manually refresh your browser to load the new app.

Database

./db/data is mounted to /var/lib/postgresql/data on the db container, giving the host easy access to all of the data.

The database container is configured (in ./db/Dockerfile) to run as a user with UID 1000. The default Unix UID is 1000, so if you were the first user created on your host machine, you are probably 1000. This means that any data postgres writes in the container should be owned by you, and you should have no trouble reading/writing it.

To restore the local database from a db.backup.gz:

  1. stop your local stack and clear out your local db with rm -rf db/data, then start the stack

  2. copy backup to db container

CONTAINER_ID=$(docker ps | grep 18xx_db | awk '{print $1}')
docker cp db.backup.gz $CONTAINER_ID:/home/db
  1. go to the container with docker-compose exec db bash, then run these commands:
cd /home/db
gzip -f -k -d db.backup.gz
pg_restore -U root -d 18xx_development db.backup

Docker Documentation

https://docs.docker.com/get-started/

If docker-compose up requires login, you probably need to create an access token and login with the Docker CLI:

Compose documentation:

Can I use Podman instead of Docker?

Yes.

make CONTAINER_ENGINE=podman …

Before filing a pull request

Run docker-compose exec rack rake while a docker instance is running to run rubocop (to ensure your changes meet the project's code style guidelines) as well as the test suite.

Profiling the code

Run docker-compose exec rack rake stackprof[spec/fixtures/18_chesapeake/1277.json] (or other file) to load and process the json file 1000 times. This will generate a stackprof.dump which can be further analyzed

stackprof --d3-flamegraph stackprof.dump >stackprof.html
stackprof stackprof.dump

Testing a Game Migration

Once a game has been made available on the website, bugs may be found where the solutions requires breaking active gamestates due to missing or added required actions. If the action is known to always need removal, or the additional action needed able to be determined computationally, we can automate this fix. This assumes you have a fixture/json file locally you want to fix.

  1. Update repair within migrate_game.rb with the logic required to add/delete a step
  2. Run docker-compose exec rack irb
  3. Execute load "migrate_game.rb"
  4. Execute migrate_json('your_json_file.json')

This will apply the migrations to the game file you specified, allowing you to verify it worked as expected.