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Lanpartyseating

Development

If you are running NixOS, make sure flakes are enabled.

On other operating systems/distributions, install Nix using the Determinate Systems Nix installer:

curl --proto '=https' --tlsv1.2 -sSf -L https://install.determinate.systems/nix | sh -s -- install

Consider installing direnv to automatically install the project's nix shell when you cd into the folder. If you have direnv installed, simply run direnv allow and follow the instructions below.

If you don't use direnv, activate the nix shell using nix shell --impure.

To start lanparty-seating:

  • In a dedicated terminal, start the database: devenv up
  • Install dependencies with mix deps.get
  • Create and migrate your database with mix ecto.create && mix ecto.migrate
  • Populate database with mix ecto.reset
  • Install Node.js dependencies with cd assets && yarn install --dev && cd ..
  • Start Phoenix endpoint with mix phx.server

Now you can visit localhost:4000 from your browser.

Configuration

Grafana

You can configure the app to automatically upload its grafana dashboards to grafana and annotate its lifecycle events in grafana by setting the following environment variables:

GRAFANA_ENABLE: Any value such as 1 enables grafana support

GRAFANA_HOST: URL to the grafana instance

GRAFANA_AUTH_TOKEN: Grafana auth token

GRAFANA_DATASOURCE_ID: Grafana datasource id for the prometheus instance that is scraping this application

OpenTelemetry (OLTP)

You can configure OpenTelemetry to send trace to honeycomb.io by setting the following environment variable:

OTEL_EXPORTER_OTLP_TRACES_HEADERS: The value x-honeycomb-team=<HONEYCOMB API TOKEN>

Debugging

There are mutiple ways to debug elixir code as show in the Debugging section of the elixir manual.

In general, you can use the VSCode editor with the recommended extensions for the project to debug in the editor using ElixirLS.

You can also launch the program with the elixir repl using iex -S mix phx.server and insert "breakpoints" into the code using IEx.Pry() in order to make the app break into the repl at that point, allowing you to introspect its state.

pkill -9 postgres

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Webapp to manage seating at Otakuthon PC Gaming

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