com.frederikam.fredboat.bootloader.Bootloader.java Source code

Introduction

Here is the source code for com.frederikam.fredboat.bootloader.Bootloader.java

Source

/*
 * MIT License
 *
 * Copyright (c) 2017 Frederik Ar. Mikkelsen
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 *
 */

package com.frederikam.fredboat.bootloader;

import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.Scanner;
import org.json.JSONArray;
import org.json.JSONObject;

public class Bootloader {

    private static JSONArray command;
    private static String jarName;
    private static int recentBoots = 0;
    private static long lastBoot = 0L;

    public static void main(String[] args) throws IOException, InterruptedException {
        OUTER: while (true) {
            InputStream is = new FileInputStream(new File("./bootloader.json"));
            Scanner scanner = new Scanner(is);
            JSONObject json = new JSONObject(scanner.useDelimiter("\\A").next());
            scanner.close();

            command = json.getJSONArray("command");
            jarName = json.getString("jarName");

            Process process = boot();
            process.waitFor();
            System.out.println("[BOOTLOADER] Bot exited with code " + process.exitValue());

            switch (process.exitValue()) {
            case ExitCodes.EXIT_CODE_UPDATE:
                System.out.println("[BOOTLOADER] Now updating...");
                update();
                break;
            case 130:
            case ExitCodes.EXIT_CODE_NORMAL:
                System.out.println("[BOOTLOADER] Now shutting down...");
                break OUTER;
            //SIGINT received or clean exit
            default:
                System.out.println("[BOOTLOADER] Now restarting..");
                break;
            }
        }
    }

    private static Process boot() throws IOException {
        //Check that we are not booting too quick (we could be stuck in a login loop)
        if (System.currentTimeMillis() - lastBoot > 3000 * 1000) {
            recentBoots = 0;
        }

        recentBoots++;
        lastBoot = System.currentTimeMillis();

        if (recentBoots >= 4) {
            System.out.println("[BOOTLOADER] Failed to restart 3 times, probably due to login errors. Exiting...");
            System.exit(-1);
        }

        //ProcessBuilder pb = new ProcessBuilder(System.getProperty("java.home") + "/bin/java -jar "+new File("FredBoat-1.0.jar").getAbsolutePath())
        ProcessBuilder pb = new ProcessBuilder().inheritIO();
        ArrayList<String> list = new ArrayList<>();
        command.forEach((Object str) -> {
            list.add((String) str);
        });

        pb.command(list);

        Process process = pb.start();
        return process;
    }

    private static void update() {
        //The main program has already prepared the shaded jar. We just need to replace the jars.
        File oldJar = new File("./" + jarName);
        oldJar.delete();
        File newJar = new File("./update/target/" + jarName);
        newJar.renameTo(oldJar);

        //Now clean up the workspace
        boolean deleted = new File("./update").delete();
        System.out.println("[BOOTLOADER] Updated. Update dir deleted: " + deleted);
    }

}