nixos-configs/inquisitor.nix

{pkgs, ...}:

let
  # Import the inquisitor package and build it
  inquisitorSource = pkgs.fetchFromGitHub {
    owner = "Jaculabilis";
    repo = "Inquisitor";
    rev = "933596d25c183782a8864e0d8c47bc65a64a791d";
    sha256 = "0haa67lpm8dm8k2inyvfqdvxi1lzvrkb65vgv8nzq51iwlydygx7";
  };
  inquisitor = pkgs.callPackage inquisitorSource {};

  # Define the inquisitor data directory
  inquisiDir = "/var/lib/inquisitor";

  # Create the inquisitor config file in the nix store, pointing to /var/lib/
  inquisitorConfig = pkgs.writeTextFile {
    name = "inquisitor.conf";
    text = ''
      DataPath = ${inquisiDir}/data/
      SourcePath = ${inquisiDir}/sources/
      CachePath = ${inquisiDir}/cache/
      Verbose = false
      LogFile = /var/log/inquisitor.log
    '';
  };

  # Create a run script for the server that sets up all necessary state
  inquisitorRun = pkgs.writeShellScriptBin "run.sh" ''
    # Ensure inquisitor directories and inquisitor source folder
    ${pkgs.coreutils}/bin/mkdir -p ${inquisiDir}/data/inquisitor/
    ${pkgs.coreutils}/bin/mkdir -p ${inquisiDir}/sources/
    ${pkgs.coreutils}/bin/mkdir -p ${inquisiDir}/cache/
    if [ ! -f ${inquisiDir}/data/inquisitor/state ]; then
      ${pkgs.coreutils}/bin/echo "{}" > ${inquisiDir}/data/inquisitor/state
    fi

    # Run inquisitor
    cd ${inquisiDir}
    ${inquisitor}/bin/gunicorn \
      --bind=localhost:24133 \
      --workers=4 \
      --env INQUISITOR_CONFIG=${inquisitorConfig} \
      --log-level debug \
      "inquisitor.app:wsgi()"
  '';

  # Create a wrapper script to let users call into inquisitor safely
  inquisitorWrapper = pkgs.writeShellScriptBin "inq" ''
    INQUISITOR_CONFIG=${inquisitorConfig} ${inquisitor}/bin/inquisitor "$@"
  '';
in
{
  # Create a user for the service
  users.users.inquisitor = {
    description = "Inquisitor service user";
    isSystemUser = true;
    home = "${inquisiDir}";
    createHome = true;
    packages = [ inquisitor ];
  };

  # Give all users the inq wrapper
  environment.systemPackages = [ inquisitorWrapper ];

  # Set up the inquisitor service
  systemd.services.inquisitor =
  {
    description = "Inquisitor server";
    script = "${inquisitorRun}/bin/run.sh";
    serviceConfig = {
      User = "inquisitor";
      Type = "simple";
    };
    wantedBy = [ "multi-user.target" ];
    after = [ "network.target" ];
    enable = true;
  };

  # Set up nginx to reverse proxy from the beatific url to the inq server
  services.nginx.enable = true;
  services.nginx.virtualHosts.inquisitorHost = {
    listen = [ { addr = "10.7.3.99"; port = 80; } ];
    locations."/".extraConfig = ''
      access_log /var/log/nginx/access.inquisitor.log;
      proxy_buffering off;
      proxy_pass http://localhost:24133/;
    '';
  };

  # Allow nginx through the firewall
  networking.firewall = {
    allowedTCPPorts = [
      80  # http
      443 # https
    ];
  };
}