with builtins; {

  imports = [ ./journald/nextcloud.nix ./journald/kibana.nix ];

  resource = {

    graylog_input = {
      journalbeat = {
        title = "Journalbeat Logs";
        # https://javadoc.io/doc/org.graylog2/graylog2-inputs/latest/index.html
        type = "org.graylog.plugins.beats.Beats2Input";
        global = true;
        attributes = toJSON ({
          bind_address = "0.0.0.0";
          no_beats_prefix = true;
          number_worker_threads = 4;
          port = 5044;
          recv_buffer_size = 1048576;
          tcp_keepalive = false;
          tls_cert_file = "";
          tls_client_auth = "disabled";
          tls_client_auth_cert_file = "";
          tls_enable = false;
          tls_key_file = "";
          tls_key_password = "";
        });
      };
    };

    graylog_input_static_fields.journalbeat = {
      input_id = "\${graylog_input.journalbeat.id}";
      fields = {
        from_journald = true;
        journalbeat = true;
      };
    };

    graylog_stream.journald = {
      title = "journald";
      description = "journald processing stream";
      index_set_id = "\${graylog_index_set.default.id}";
      disabled = false;
      matching_type = "AND";
    };

    graylog_stream_rule.journald = {
      field = "from_journald";
      value = true;
      stream_id = "\${graylog_stream.journald.id}";
      #description = "";
      type = 1;
      inverted = false;
    };

    graylog_pipeline_connection = {
      journald = {
        stream_id = "\${graylog_stream.journald.id}";
        pipeline_ids = [
          #"\${graylog_pipeline.journald_fix_loglevel.id}"
          "\${graylog_pipeline.journald_iptable_parse.id}"
          #"\${graylog_pipeline.journald_loglevel_int_to_str.id}"
        ];
      };
    };

    graylog_pipeline = {
      journald_iptable_parse.source = ''
        pipeline "journald : ip table parse"
          stage 0 match either
            rule "journald : iptables split"
        end
      '';
    };

    graylog_pipeline_rule = {
      iptableSplit.source = ''
        rule "journald : iptables split"
        when
          has_field("facility") && $message.facility == "kernel"
        then
          let result = regex(
            "^refused connection:\\s*IN=(.*) OUT=(.*) MAC=(.*) SRC=(.*) DST=(.*) LEN=.* TOS=.* PREC=.* TTL=(.*) ID=(.*) PROTO=(.*) SPT=(.*) DPT=(.*) WINDOW=(.*) RES=.*",
            to_string($message.message),
            ["in_interface"
            ,"out_interface"
            ,"mac_addr"
            ,"src_addr"
            ,"dst_addr"
            ,"ttl"
            ,"iptables_id"
            ,"protocol"
            ,"src_port"
            ,"dst_port"
            ,"window"]
            );

          set_field("in_interface"     ,result.in_interface);
          set_field("out_interface"    ,result.out_interface);
          set_field("mac_addr"         ,result.mac_addr);
          set_field("src_addr"         ,result.src_addr);
          set_field("dst_addr"         ,result.dst_addr);
          set_field("ttl"              ,result.ttl);
          set_field("iptables_id"      ,result.iptables_id);
          set_field("protocol"         ,result.protocol);
          set_field("src_port"         ,result.src_port);
          set_field("dst_port"         ,result.dst_port);
          set_field("window"           ,result.window);

        end
      '';

    };
  };

}