Paper/CraftBukkit-Patches/0028-Watchdog-Thread.patch

From 51ae704ad3290541373ec51570d48c9e66743f5c Mon Sep 17 00:00:00 2001
From: md_5 <md_5@live.com.au>
Date: Sat, 23 Feb 2013 12:33:20 +1100
Subject: [PATCH] Watchdog Thread.

---
 .../java/net/minecraft/server/MinecraftServer.java |  2 +
 src/main/java/org/bukkit/craftbukkit/Spigot.java   | 78 +++++++++++++++++-
 src/main/java/org/spigotmc/RestartCommand.java     | 23 ++++++
 src/main/java/org/spigotmc/WatchdogThread.java     | 93 ++++++++++++++++++++++
 src/main/resources/configurations/bukkit.yml       |  3 +
 5 files changed, 197 insertions(+), 2 deletions(-)
 create mode 100644 src/main/java/org/spigotmc/RestartCommand.java
 create mode 100644 src/main/java/org/spigotmc/WatchdogThread.java

diff --git a/src/main/java/net/minecraft/server/MinecraftServer.java b/src/main/java/net/minecraft/server/MinecraftServer.java
index aa6a14a..6005fac 100644
--- a/src/main/java/net/minecraft/server/MinecraftServer.java
+++ b/src/main/java/net/minecraft/server/MinecraftServer.java
@@ -421,6 +421,7 @@ public abstract class MinecraftServer implements ICommandListener, Runnable, IMo
                     this.q();
                     SpigotTimings.serverTickTimer.stopTiming();
                     org.bukkit.CustomTimingsHandler.tick();
+                    org.spigotmc.WatchdogThread.tick();
                 }
                 // Spigot end
             } else {
@@ -448,6 +449,7 @@ public abstract class MinecraftServer implements ICommandListener, Runnable, IMo
             this.a(crashreport);
         } finally {
             try {
+                org.spigotmc.WatchdogThread.doStop();
                 this.stop();
                 this.isStopped = true;
             } catch (Throwable throwable1) {
diff --git a/src/main/java/org/bukkit/craftbukkit/Spigot.java b/src/main/java/org/bukkit/craftbukkit/Spigot.java
index 83018b0..931f6fd 100644
--- a/src/main/java/org/bukkit/craftbukkit/Spigot.java
+++ b/src/main/java/org/bukkit/craftbukkit/Spigot.java
@@ -1,5 +1,6 @@
 package org.bukkit.craftbukkit;
 
+import java.io.File;
 import java.io.IOException;
 import java.util.ArrayList;
 import net.minecraft.server.*;
@@ -8,9 +9,11 @@ import org.bukkit.configuration.file.YamlConfiguration;
 
 import java.util.List;
 import java.util.logging.Level;
-import java.util.logging.Logger;
 import org.bukkit.Bukkit;
+import org.bukkit.entity.Player;
 import org.spigotmc.Metrics;
+import org.spigotmc.RestartCommand;
+import org.spigotmc.WatchdogThread;
 
 public class Spigot {
     static AxisAlignedBB maxBB = AxisAlignedBB.a(0,0,0,0,0,0);
@@ -23,6 +26,7 @@ public class Spigot {
 
     public static void initialize(CraftServer server, SimpleCommandMap commandMap, YamlConfiguration configuration) {
         commandMap.register("bukkit", new org.bukkit.craftbukkit.command.TicksPerSecondCommand("tps"));
+        commandMap.register("restart", new RestartCommand("restart"));
 
         server.whitelistMessage = configuration.getString("settings.whitelist-message", server.whitelistMessage);
         server.stopMessage = configuration.getString("settings.stop-message", server.stopMessage);
@@ -31,12 +35,23 @@ public class Spigot {
         server.commandComplete = configuration.getBoolean("settings.command-complete", true);
         server.spamGuardExclusions = configuration.getStringList("settings.spam-exclusions");
 
+        int configVersion = configuration.getInt("config-version");
+        switch (configVersion) {
+            case 0:
+                configuration.set("settings.timeout-time", 30);
+            case 1:
+                configuration.set("settings.timeout-time", 60);
+        }
+        configuration.set("config-version", 2);
+
+        WatchdogThread.doStart(configuration.getInt("settings.timeout-time", 60), configuration.getBoolean("settings.restart-on-crash", false));
+
         server.orebfuscatorEnabled = configuration.getBoolean("orebfuscator.enable", false);
         server.orebfuscatorEngineMode = configuration.getInt("orebfuscator.engine-mode", 1);
         server.orebfuscatorUpdateRadius = configuration.getInt("orebfuscator.update-radius", 2);
         server.orebfuscatorDisabledWorlds = configuration.getStringList("orebfuscator.disabled-worlds");
         if (server.orebfuscatorEngineMode != 1 && server.orebfuscatorEngineMode != 2) {
-        	server.orebfuscatorEngineMode = 1;
+            server.orebfuscatorEngineMode = 1;
         }
 
         if (server.chunkGCPeriod == 0) {
@@ -264,4 +279,63 @@ public class Spigot {
         SpigotTimings.checkIfActiveTimer.stopTiming();
         return isActive;
     }
+
+    public static void restart() {
+        try {
+            String startupScript = MinecraftServer.getServer().server.configuration.getString("settings.restart-script-location", "");
+            final File file = new File(startupScript);
+            if (file.isFile()) {
+                System.out.println("Attempting to restart with " + startupScript);
+
+                // Kick all players
+                for (Player p : Bukkit.getServer().getOnlinePlayers()) {
+                   ((org.bukkit.craftbukkit.entity.CraftPlayer) p).kickPlayer("Server is restarting", true);
+                }
+                // Give the socket a chance to send the packets
+                try {
+                    Thread.sleep(100);
+                } catch (InterruptedException ex) {
+                }
+                // Close the socket so we can rebind with the new process
+                MinecraftServer.getServer().ae().a();
+
+                // Give time for it to kick in
+                try {
+                    Thread.sleep(100);
+                } catch (InterruptedException ex) {
+                }
+
+                // Actually shutdown
+                try {
+                    MinecraftServer.getServer().stop();
+                } catch (Throwable t) {
+                }
+
+                // This will be done AFTER the server has completely halted
+                Thread shutdownHook = new Thread() {
+                    @Override
+                    public void run(){
+                        try {
+                            String os = System.getProperty("os.name").toLowerCase();
+                            if (os.contains("win")) {
+                                Runtime.getRuntime().exec("cmd /c start " + file.getPath());
+                            } else {
+                                Runtime.getRuntime().exec(new String[] { "sh", file.getPath()});
+                            }
+                        } catch (Exception e){
+                            e.printStackTrace();
+                        }
+                    }
+                };
+
+                shutdownHook.setDaemon(true);
+                Runtime.getRuntime().addShutdownHook(shutdownHook);
+                System.exit(0);
+            } else {
+                System.out.println("Startup script '" + startupScript + "' does not exist!");
+            }
+        } catch (Exception ex) {
+            ex.printStackTrace();
+        }
+    }
 }
diff --git a/src/main/java/org/spigotmc/RestartCommand.java b/src/main/java/org/spigotmc/RestartCommand.java
new file mode 100644
index 0000000..2d5c89f
--- /dev/null
+++ b/src/main/java/org/spigotmc/RestartCommand.java
@@ -0,0 +1,23 @@
+package org.spigotmc;
+
+import org.bukkit.command.Command;
+import org.bukkit.command.CommandSender;
+import org.bukkit.craftbukkit.Spigot;
+
+public class RestartCommand extends Command {
+
+    public RestartCommand(String name) {
+        super(name);
+        this.description = "Restarts the server";
+        this.usageMessage = "/restart";
+        this.setPermission("bukkit.command.restart");
+    }
+
+    @Override
+    public boolean execute(CommandSender sender, String currentAlias, String[] args) {
+        if (testPermission(sender)) {
+            Spigot.restart();
+        }
+        return true;
+    }
+}
diff --git a/src/main/java/org/spigotmc/WatchdogThread.java b/src/main/java/org/spigotmc/WatchdogThread.java
new file mode 100644
index 0000000..10390b8
--- /dev/null
+++ b/src/main/java/org/spigotmc/WatchdogThread.java
@@ -0,0 +1,93 @@
+package org.spigotmc;
+
+import java.lang.management.ManagementFactory;
+import java.lang.management.MonitorInfo;
+import java.lang.management.ThreadInfo;
+import java.util.logging.Level;
+import java.util.logging.Logger;
+import org.bukkit.Bukkit;
+import org.bukkit.craftbukkit.Spigot;
+
+public class WatchdogThread extends Thread {
+
+    private static WatchdogThread instance;
+    private final long timeoutTime;
+    private final boolean restart;
+    private volatile long lastTick;
+    private volatile boolean stopping;
+
+    private WatchdogThread(long timeoutTime, boolean restart) {
+        super("Spigot Watchdog Thread");
+        this.timeoutTime = timeoutTime;
+        this.restart = restart;
+    }
+
+    public static void doStart(int timeoutTime, boolean restart) {
+        if (instance == null) {
+            instance = new WatchdogThread(timeoutTime * 1000L, restart);
+            instance.start();
+        }
+    }
+
+    public static void tick() {
+        instance.lastTick = System.currentTimeMillis();
+    }
+
+    public static void doStop() {
+        if (instance != null) {
+            instance.stopping = true;
+        }
+    }
+
+    @Override
+    public void run() {
+        while (!stopping) {
+            //
+            if (lastTick != 0 && System.currentTimeMillis() > lastTick + timeoutTime) {
+                Logger log = Bukkit.getServer().getLogger();
+                log.log(Level.SEVERE, "The server has stopped responding!");
+                log.log(Level.SEVERE, "Please report this to http://www.spigotmc.org/");
+                log.log(Level.SEVERE, "Be sure to include ALL relevant console errors and Minecraft crash reports");
+                log.log(Level.SEVERE, "Spigot version: " + Bukkit.getServer().getVersion());
+                //
+                log.log(Level.SEVERE, "Current Thread State:");
+                ThreadInfo[] threads = ManagementFactory.getThreadMXBean().dumpAllThreads(true, true);
+                for (ThreadInfo thread : threads) {
+                    if (thread.getThreadState() != State.WAITING) {
+                        log.log(Level.SEVERE, "------------------------------");
+                        //
+                        log.log(Level.SEVERE, "Current Thread: " + thread.getThreadName());
+                        log.log(Level.SEVERE, "\tPID: " + thread.getThreadId()
+                                + " | Suspended: " + thread.isSuspended()
+                                + " | Native: " + thread.isInNative()
+                                + " | State: " + thread.getThreadState());
+                        if (thread.getLockedMonitors().length != 0) {
+                            log.log(Level.SEVERE, "\tThread is waiting on monitor(s):");
+                            for (MonitorInfo monitor : thread.getLockedMonitors()) {
+                                log.log(Level.SEVERE, "\t\tLocked on:" + monitor.getLockedStackFrame());
+                            }
+                        }
+                        log.log(Level.SEVERE, "\tStack:");
+                        //
+                        StackTraceElement[] stack = thread.getStackTrace();
+                        for (int line = 0; line < stack.length; line++) {
+                            log.log(Level.SEVERE, "\t\t" + stack[line].toString());
+                        }
+                    }
+                }
+                log.log(Level.SEVERE, "------------------------------");
+
+                if (restart) {
+                    Spigot.restart();
+                }
+                break;
+            }
+
+            try {
+                sleep(10000);
+            } catch (InterruptedException ex) {
+                interrupt();
+            }
+        }
+    }
+}
diff --git a/src/main/resources/configurations/bukkit.yml b/src/main/resources/configurations/bukkit.yml
index e568bf6..7c18391 100644
--- a/src/main/resources/configurations/bukkit.yml
+++ b/src/main/resources/configurations/bukkit.yml
@@ -31,6 +31,9 @@ settings:
     command-complete: true
     spam-exclusions:
        - /skill
+    timeout-time: 30
+    restart-on-crash: false
+    restart-script-location: /path/to/server/start.sh
 world-settings:
     default:
         growth-chunks-per-tick: 650
-- 
1.8.1.1