Arakne / Araknemu

 * This file is part of Araknemu.

 *

 * Araknemu is free software: you can redistribute it and/or modify

 * it under the terms of the GNU Lesser General Public License as published by

 * the Free Software Foundation, either version 3 of the License, or

 * (at your option) any later version.

 *

 * Araknemu is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

 * GNU Lesser General Public License for more details.

 *

 * You should have received a copy of the GNU Lesser General Public License

 * along with Araknemu.  If not, see <https://www.gnu.org/licenses/>.

 *

 * Copyright (c) 2017-2020 Vincent Quatrevieux

 */

package fr.quatrevieux.araknemu.game.admin.server;

import fr.quatrevieux.araknemu.Araknemu;

import fr.quatrevieux.araknemu.game.GameService;

import fr.quatrevieux.araknemu.game.admin.AbstractCommand;

import fr.quatrevieux.araknemu.game.admin.AdminPerformer;

import fr.quatrevieux.araknemu.game.fight.FightService;

import fr.quatrevieux.araknemu.game.player.PlayerService;

import java.lang.management.ManagementFactory;

import java.time.Duration;

import java.time.Instant;

import java.util.List;

/**

 * Display information about the server

 */

public final class Info extends AbstractCommand {

    private final Araknemu app;

    private final PlayerService playerService;

    private final GameService gameService;

    private final FightService fightService;

    public Info(Araknemu app, PlayerService playerService, GameService gameService, FightService fightService) {

        this.app = app;

        this.playerService = playerService;

        this.gameService = gameService;

        this.fightService = fightService;

    }

    @Override

    protected void build(Builder builder) {

        builder

            .description("Display information about the server")

            .help(formatter -> formatter

                .synopsis("info")

                .example("${server} info", "Display server info")

            )

        ;

    }

    @Override

    public String name() {

        return "info";

    }

    @Override

    public void execute(AdminPerformer performer, List<String> arguments) {

        performer.success("===== Server information =====");

        performer.info(

            "Uptime : {} (started at : {})",

            formatDuration(Duration.between(app.startDate(), Instant.now())),

            app.startDate()

        );

        performer.info("Online : {} sessions and {} players", gameService.sessions().size(), playerService.online().size());

        performer.info("Fights : {} fights with {} fighters",

            fightService.fights().size(),

            fightService.fights().stream().mapToLong(fight -> fight.fighters().size()).sum()

        );

        performer.info(

            "RAM usage : {} / {}",

            formatBytes(Runtime.getRuntime().totalMemory() - Runtime.getRuntime().freeMemory()),

            formatBytes(Runtime.getRuntime().totalMemory())

        );

        performer.info("Number of threads : {}", Thread.activeCount());

        performer.info("CPU Usage {}%", cpuUsage());

    }

    private String formatDuration(Duration duration) {

        final StringBuilder formatted = new StringBuilder();

        if (duration.toDays() > 0) {

            formatted.append(duration.toDays()).append(" days ");

        }

        if (duration.toHours() % 24 > 0) {

            formatted.append(duration.toHours() % 24).append(" hours ");

        }

        formatted.append(duration.toMinutes() % 60).append(" minutes");

        return formatted.toString();

    }

    private static String formatBytes(long bytes) {

        final long absB = bytes == Long.MIN_VALUE ? Long.MAX_VALUE : Math.abs(bytes);

        if (absB < 1024) {

            return bytes + " B";

        }

        long value = absB;

        final char[] units = new char[] {'K', 'M', 'G'};

        int currentUnit = 0;

        for (int i = 40; i >= 0 && absB > 0xfffccccccccccccL >> i; i -= 10) {

            value >>= 10;

            ++currentUnit;

        }

        value *= Long.signum(bytes);

        return String.format("%.1f %ciB", value / 1024.0, units[currentUnit]);

    }

}