nix-config/hosts/mastodon/default.nix

{ zentralwerk, config, lib, pkgs, ... }:
{
  deployment = {
    mem = 8192;
    vcpu = 16;
    needForSpeed = true;
  };
  networking = {
    hostName = "mastodon";
    hosts = with zentralwerk.lib.config.site.net.serv; {
      ${hosts6.up4.auth} = [ "auth.c3d2.de" ];
      ${hosts4.auth} = [ "auth.c3d2.de" ];
    };
    firewall.allowedTCPPorts = [ 80 443 ];
  };
  system.stateVersion = "22.11";
  nixpkgs.config.allowUnfreePredicate = pkg:
    lib.getName pkg == "elasticsearch";
  
  services.postgresql = {
    enable = true;
    ensureUsers = [ {
      name = "collectd";
      ensurePermissions = {
        "DATABASE \"${config.services.mastodon.database.name}\"" = "ALL PRIVILEGES";
      };
    } ];
  };
  services.elasticsearch = {
    enable = true;
    package = pkgs.elasticsearch7;
  };
  services.mastodon = {
    enable = true;
    localDomain = "c3d2.social";

    package = pkgs.mastodon.overrideAttrs (oa: {
      # install chaos.social theme for eri
      postPatch =
        let
          chaos_social_custom = pkgs.fetchzip {
            url = "https://github.com/chaossocial/custom/archive/dadb72e258e56a4773d58d242d9fd1048d9560c7.zip";
            sha256 = "sha256-0yfor0cpPGUZbZHP7RXs5Ls6uNzcXi8Zb3AMaNqPz5s=";
          };
        in ''
          for F in {custom,custom_wide,mascot,mastodon-light}.scss ; do
            cp ${chaos_social_custom}/themes/$F app/javascript/styles/
          done
          echo "chaos-social-wide: styles/custom_wide.scss" >> config/themes.yml

          rm -fr public/packs tmp/
        '';
    });

    smtp = {
      host = "mail.c3d2.de";
      port = 587;
      fromAddress = "mail@c3d2.social";
      authenticate = false;
    };

    elasticsearch.host = "127.0.0.1";

    extraConfig = {
      ALTERNATE_DOMAINS = lib.concatStringsSep "," [
        "${config.networking.hostName}.flpk.zentralwerk.org"
        "social.c3d2.de"
      ];
      DEFAULT_LOCALE = "de";
      WEB_CONCURRENCY = toString config.deployment.vcpu;
      # MAX_THREADS = toString 5;

      LDAP_ENABLED = "true";
      LDAP_METHOD = "simple_tls";
      LDAP_HOST = "auth.c3d2.de";
      LDAP_PORT = "636";
      LDAP_BIND_DN = "uid=search,ou=users,dc=c3d2,dc=de";
      LDAP_BASE = "ou=users,dc=c3d2,dc=de";
      LDAP_SEARCH_FILTER = "(&(objectclass=person)(|(%{uid}=%{email})(%{mail}=%{email})))";
      LDAP_UID = "uid";
    };

    configureNginx = true;
  };
  # Inject LDAP secrets
  systemd.services.mastodon-init-dirs.script = lib.mkAfter ''
    cat ${config.sops.secrets."mastodon/env".path} >> /var/lib/mastodon/.secrets_env
  '';

  sops.defaultSopsFile = ./secrets.yaml;
  sops.secrets."mastodon/env" = {
    owner = "mastodon";
  };

  # Sidekiq monitoring
  c3d2.hq.statistics.enable = true;
  services.collectd.plugins = {
    redis =
      let
        queries = [ {
          command = "GET stat:processed";
          type = "counter";
          instance = "sidekiq_stat_processed";
        } {
          command = "GET stat:failed";
          type = "counter";
          instance = "sidekiq_stat_failed";
        } {
          command = "LLEN queue:#default";
          type = "queue_length";
          instance = "sidekiq_default_queue_len";
        } {
          command = "LLEN queue:#ingress";
          type = "queue_length";
          instance = "sidekiq_ingress_queue_len";
        } {
          command = "LLEN queue:#mailers";
          type = "queue_length";
          instance = "sidekiq_mailers_queue_len";
        } {
          command = "LLEN queue:#pull";
          type = "queue_length";
          instance = "sidekiq_pull_queue_len";
        } {
          command = "LLEN queue:#push";
          type = "queue_length";
          instance = "sidekiq_push_queue_len";
        } {
          command = "LLEN queue:#scheduler";
          type = "queue_length";
          instance = "sidekiq_scheduler_queue_len";
        } {
          command = "ZCARD schedule";
          type = "count";
          instance = "sidekiq_scheduled";
        } {
          command = "ZCARD retry";
          type = "count";
          instance = "sidekiq_retries";
        } {
          command = "ZCARD dead";
          type = "count";
          instance = "sidekiq_dead";
        } {
          command = "SCARD processes";
          type = "backends";
          instance = "sidekiq_processes";
        } ];
      in ''
        <Node "mastodon">
          Host "${config.services.mastodon.redis.host}"
          Port "${toString config.services.mastodon.redis.port}"
          Timeout 3000

          ${lib.concatMapStrings ({ command, type, instance }: ''
            <Query "${command}">
              Type "${type}"
              Instance "${instance}"
            </Query>
          '') queries}
        </Node>
      '';
    postgresql = ''
      <Database "${config.services.mastodon.database.name}">
        Param database "${config.services.mastodon.database.name}"
        Query backends
        Query transactions
        Query queries
        Query disk_io
        Query disk_usage
      </Database>
    '';
  };
}