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Paper/CraftBukkit-Patches/0023-Watchdog-Thread.patch
md_5 167757be21 Ensure main thread stack is dumped
2013-08-09 20:34:05 +10:00

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From de7e8217654cf0fd14076c0ce8cbf569cc84e39d 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.
diff --git a/src/main/java/net/minecraft/server/MinecraftServer.java b/src/main/java/net/minecraft/server/MinecraftServer.java
index f52d619..33eaecc 100644
--- a/src/main/java/net/minecraft/server/MinecraftServer.java
+++ b/src/main/java/net/minecraft/server/MinecraftServer.java
@@ -413,6 +413,7 @@ public abstract class MinecraftServer implements ICommandListener, Runnable, IMo
this.s();
SpigotTimings.serverTickTimer.stopTiming();
org.spigotmc.CustomTimingsHandler.tick();
+ org.spigotmc.WatchdogThread.tick();
}
// Spigot end
} else {
@@ -440,6 +441,7 @@ 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/spigotmc/RestartCommand.java b/src/main/java/org/spigotmc/RestartCommand.java
new file mode 100644
index 0000000..c8125c2
--- /dev/null
+++ b/src/main/java/org/spigotmc/RestartCommand.java
@@ -0,0 +1,111 @@
+package org.spigotmc;
+
+import java.io.File;
+import java.util.List;
+import net.minecraft.server.EntityPlayer;
+import net.minecraft.server.MinecraftServer;
+import net.minecraft.server.Packet255KickDisconnect;
+import org.bukkit.command.Command;
+import org.bukkit.command.CommandSender;
+
+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 ) )
+ {
+ restart();
+ }
+ return true;
+ }
+
+ public static void restart()
+ {
+ try
+ {
+ final File file = new File( SpigotConfig.restartScript );
+ if ( file.isFile() )
+ {
+ System.out.println( "Attempting to restart with " + SpigotConfig.restartScript );
+
+ // Kick all players
+ for ( EntityPlayer p : (List< EntityPlayer>) MinecraftServer.getServer().getPlayerList().players )
+ {
+ p.playerConnection.networkManager.queue( new Packet255KickDisconnect( "Server is restarting" ) );
+ p.playerConnection.networkManager.d();
+ }
+ // 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().ag().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 );
+ } else
+ {
+ System.out.println( "Startup script '" + SpigotConfig.restartScript + "' does not exist! Stopping server." );
+ }
+ System.exit( 0 );
+ } catch ( Exception ex )
+ {
+ ex.printStackTrace();
+ }
+ }
+}
diff --git a/src/main/java/org/spigotmc/SpigotConfig.java b/src/main/java/org/spigotmc/SpigotConfig.java
index 8ef108d..8499c7f 100644
--- a/src/main/java/org/spigotmc/SpigotConfig.java
+++ b/src/main/java/org/spigotmc/SpigotConfig.java
@@ -142,4 +142,16 @@ public class SpigotConfig
{
commands.put( "tps", new TicksPerSecondCommand( "tps" ) );
}
+
+ public static int timeoutTime = 60;
+ public static boolean restartOnCrash = true;
+ public static String restartScript = "./start.sh";
+ private static void watchdog()
+ {
+ timeoutTime = getInt( "settings.timeout-time", timeoutTime );
+ restartOnCrash = getBoolean( "settings.restart-on-crash", restartOnCrash );
+ restartScript = getString( "settings.restart-script", restartScript );
+ commands.put( "restart", new RestartCommand( "restart" ) );
+ WatchdogThread.doStart( timeoutTime, restartOnCrash );
+ }
}
diff --git a/src/main/java/org/spigotmc/WatchdogThread.java b/src/main/java/org/spigotmc/WatchdogThread.java
new file mode 100644
index 0000000..0a646d6
--- /dev/null
+++ b/src/main/java/org/spigotmc/WatchdogThread.java
@@ -0,0 +1,122 @@
+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 net.minecraft.server.MinecraftServer;
+import org.bukkit.Bukkit;
+
+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, "------------------------------" );
+ log.log( Level.SEVERE, "Server thread dump (Look for plugins here before reporting to Spigot!):" );
+ dumpThread( ManagementFactory.getThreadMXBean().getThreadInfo( MinecraftServer.getServer().primaryThread.getId(), Integer.MAX_VALUE ), log );
+ log.log( Level.SEVERE, "------------------------------" );
+ //
+ log.log( Level.SEVERE, "Entire Thread Dump:" );
+ log.log( Level.SEVERE, "------------------------------" );
+ ThreadInfo[] threads = ManagementFactory.getThreadMXBean().dumpAllThreads( true, true );
+ for ( ThreadInfo thread : threads )
+ {
+ dumpThread( thread, log );
+ }
+ log.log( Level.SEVERE, "------------------------------" );
+
+ if ( restart )
+ {
+ RestartCommand.restart();
+ }
+ break;
+ }
+
+ try
+ {
+ sleep( 10000 );
+ } catch ( InterruptedException ex )
+ {
+ interrupt();
+ }
+ }
+ }
+
+ private static void dumpThread(ThreadInfo thread, Logger log)
+ {
+ 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() );
+ }
+ }
+ }
+}
--
1.8.1.2
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