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even even even even even even even even even even even even even even even even even even even even even even even even even even even even even even even even even even even even even even even even even even even even even even even even even even even even even even even even even even even even more work
290 lines
12 KiB
Diff
290 lines
12 KiB
Diff
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: Zach Brown <zach.brown@destroystokyo.com>
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Date: Fri, 12 May 2017 23:34:11 -0500
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Subject: [PATCH] Properly handle async calls to restart the server
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The watchdog thread calls the server restart function asynchronously. Prior to
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this change, it attempted to do several non-safe operations from the watchdog
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thread, rather than the main. Specifically, because of a separate upstream change,
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it causes player entities to be ticked asynchronously, among other things.
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This is dangerous.
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This patch moves the old handling into a synchronous variant, for calls from the
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restart command, and adds separate handling for async calls, such as those from
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the watchdog thread.
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When calling from the watchdog thread, we cannot assume the main thread is in a
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tickable state; it may be completely deadlocked. In order to handle this, we mark
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the server as stopping, in order to account for situations where the server should
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complete a tick reasonbly soon, i.e. 99% of cases.
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Should the server not enter a state where it is stopping within 10 seconds, We
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will assume that the server has in fact deadlocked and will proceed to force
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kill the server.
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This modification does not force restart the server should we actually enter a
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deadlocked state where the server is stopping, whereas this will in most cases
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exit within a reasonable amount of time, to put a fixed limit on a process that
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will have plugins and worlds saving to the disk has a high potential to result
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in corruption/dataloss.
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diff --git a/src/main/java/net/minecraft/server/MinecraftServer.java b/src/main/java/net/minecraft/server/MinecraftServer.java
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index 74073d3f8c9dda6f10e9fb34071dae079b73fb24..1617c59bf689e5f67c2af5c3a22ce5791d47b408 100644
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--- a/src/main/java/net/minecraft/server/MinecraftServer.java
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+++ b/src/main/java/net/minecraft/server/MinecraftServer.java
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@@ -233,6 +233,7 @@ public abstract class MinecraftServer extends ReentrantBlockableEventLoop<TickTa
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public final Map<ResourceKey<Level>, ServerLevel> levels;
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private PlayerList playerList;
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private volatile boolean running;
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+ private volatile boolean isRestarting = false; // Paper - flag to signify we're attempting to restart
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private boolean stopped;
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private int tickCount;
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protected final Proxy proxy;
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@@ -916,7 +917,7 @@ public abstract class MinecraftServer extends ReentrantBlockableEventLoop<TickTa
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if (this.playerList != null) {
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MinecraftServer.LOGGER.info("Saving players");
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this.playerList.saveAll();
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- this.playerList.removeAll();
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+ this.playerList.removeAll(this.isRestarting); // Paper
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try { Thread.sleep(100); } catch (InterruptedException ex) {} // CraftBukkit - SPIGOT-625 - give server at least a chance to send packets
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}
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@@ -982,6 +983,12 @@ public abstract class MinecraftServer extends ReentrantBlockableEventLoop<TickTa
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}
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public void halt(boolean flag) {
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+ // Paper start - allow passing of the intent to restart
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+ this.safeShutdown(flag, false);
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+ }
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+ public void safeShutdown(boolean flag, boolean isRestarting) {
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+ this.isRestarting = isRestarting;
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+ // Paper end
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this.running = false;
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if (flag) {
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try {
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diff --git a/src/main/java/net/minecraft/server/players/PlayerList.java b/src/main/java/net/minecraft/server/players/PlayerList.java
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index 3eaf106f8f17288857ce1a149d0366cf04235307..79ebb15bed6eec80c12c1020b2b6b07c758332aa 100644
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--- a/src/main/java/net/minecraft/server/players/PlayerList.java
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+++ b/src/main/java/net/minecraft/server/players/PlayerList.java
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@@ -1133,8 +1133,15 @@ public abstract class PlayerList {
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}
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public void removeAll() {
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+ // Paper start - Extract method to allow for restarting flag
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+ this.removeAll(false);
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+ }
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+
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+ public void removeAll(boolean isRestarting) {
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+ // Paper end
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// CraftBukkit start - disconnect safely
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for (ServerPlayer player : this.players) {
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+ if (isRestarting) player.connection.disconnect(org.spigotmc.SpigotConfig.restartMessage); else // Paper
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player.connection.disconnect(this.server.server.shutdownMessage()); // CraftBukkit - add custom shutdown message // Paper - Adventure
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}
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// CraftBukkit end
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diff --git a/src/main/java/org/spigotmc/RestartCommand.java b/src/main/java/org/spigotmc/RestartCommand.java
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index 94d8ba376cd1f024b244654cac9bb62bb19e3060..a142a56a920e153ed84c08cece993f10d76f7793 100644
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--- a/src/main/java/org/spigotmc/RestartCommand.java
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+++ b/src/main/java/org/spigotmc/RestartCommand.java
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@@ -46,86 +46,134 @@ public class RestartCommand extends Command
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org.spigotmc.AsyncCatcher.shuttingDown = true; // Paper
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try
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{
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- String[] split = restartScript.split( " " );
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- if ( split.length > 0 && new File( split[0] ).isFile() )
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+ // Paper - extract method and cleanup
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+ boolean isRestarting = addShutdownHook( restartScript );
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+ if ( isRestarting )
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{
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- System.out.println( "Attempting to restart with " + restartScript );
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+ System.out.println( "Attempting to restart with " + SpigotConfig.restartScript );
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+ } else
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+ {
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+ System.out.println( "Startup script '" + SpigotConfig.restartScript + "' does not exist! Stopping server." );
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+ }
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+ // Stop the watchdog
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+ WatchdogThread.doStop();
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- // Disable Watchdog
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- WatchdogThread.doStop();
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+ shutdownServer( isRestarting );
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+ // Paper end
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+ } catch ( Exception ex )
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+ {
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+ ex.printStackTrace();
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+ }
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+ }
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- // Kick all players
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- for ( ServerPlayer p : (List<ServerPlayer>) MinecraftServer.getServer().getPlayerList().players )
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- {
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- p.connection.disconnect(SpigotConfig.restartMessage);
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- }
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- // Give the socket a chance to send the packets
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- try
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- {
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- Thread.sleep( 100 );
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- } catch ( InterruptedException ex )
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- {
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- }
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- // Close the socket so we can rebind with the new process
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- MinecraftServer.getServer().getConnection().stop();
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+ // Paper start - sync copied from above with minor changes, async added
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+ private static void shutdownServer(boolean isRestarting)
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+ {
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+ if ( MinecraftServer.getServer().isSameThread() )
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+ {
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+ // Kick all players
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+ for ( ServerPlayer p : com.google.common.collect.ImmutableList.copyOf( MinecraftServer.getServer().getPlayerList().players ) )
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+ {
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+ p.connection.disconnect(SpigotConfig.restartMessage);
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+ }
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+ // Give the socket a chance to send the packets
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+ try
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+ {
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+ Thread.sleep( 100 );
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+ } catch ( InterruptedException ex )
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+ {
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+ }
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- // Give time for it to kick in
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- try
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- {
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- Thread.sleep( 100 );
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- } catch ( InterruptedException ex )
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- {
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- }
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+ closeSocket();
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- // Actually shutdown
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- try
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- {
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- MinecraftServer.getServer().close();
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- } catch ( Throwable t )
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- {
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- }
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+ // Actually shutdown
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+ try
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+ {
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+ MinecraftServer.getServer().close(); // calls stop()
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+ } catch ( Throwable t )
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+ {
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+ }
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+
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+ // Actually stop the JVM
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+ System.exit( 0 );
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- // This will be done AFTER the server has completely halted
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- Thread shutdownHook = new Thread()
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+ } else
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+ {
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+ // Mark the server to shutdown at the end of the tick
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+ MinecraftServer.getServer().safeShutdown( false, isRestarting );
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+
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+ // wait 10 seconds to see if we're actually going to try shutdown
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+ try
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+ {
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+ Thread.sleep( 10000 );
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+ }
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+ catch (InterruptedException ignored)
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+ {
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+ }
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+
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+ // Check if we've actually hit a state where the server is going to safely shutdown
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+ // if we have, let the server stop as usual
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+ if (MinecraftServer.getServer().isStopped()) return;
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+
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+ // If the server hasn't stopped by now, assume worse case and kill
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+ closeSocket();
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+ System.exit( 0 );
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+ }
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+ }
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+ // Paper end
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+
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+ // Paper - Split from moved code
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+ private static void closeSocket()
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+ {
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+ // Close the socket so we can rebind with the new process
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+ MinecraftServer.getServer().getConnection().stop();
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+
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+ // Give time for it to kick in
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+ try
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+ {
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+ Thread.sleep( 100 );
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+ } catch ( InterruptedException ex )
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+ {
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+ }
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+ }
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+ // Paper end
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+
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+ // Paper start - copied from above and modified to return if the hook registered
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+ private static boolean addShutdownHook(String restartScript)
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+ {
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+ String[] split = restartScript.split( " " );
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+ if ( split.length > 0 && new File( split[0] ).isFile() )
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+ {
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+ Thread shutdownHook = new Thread()
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+ {
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+ @Override
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+ public void run()
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{
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- @Override
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- public void run()
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+ try
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{
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- try
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+ String os = System.getProperty( "os.name" ).toLowerCase(java.util.Locale.ENGLISH);
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+ if ( os.contains( "win" ) )
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{
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- String os = System.getProperty( "os.name" ).toLowerCase(java.util.Locale.ENGLISH);
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- if ( os.contains( "win" ) )
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- {
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- Runtime.getRuntime().exec( "cmd /c start " + restartScript );
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- } else
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- {
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- Runtime.getRuntime().exec( "sh " + restartScript );
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- }
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- } catch ( Exception e )
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+ Runtime.getRuntime().exec( "cmd /c start " + restartScript );
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+ } else
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{
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- e.printStackTrace();
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+ Runtime.getRuntime().exec( "sh " + restartScript );
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}
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+ } catch ( Exception e )
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+ {
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+ e.printStackTrace();
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}
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- };
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-
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- shutdownHook.setDaemon( true );
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- Runtime.getRuntime().addShutdownHook( shutdownHook );
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- } else
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- {
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- System.out.println( "Startup script '" + SpigotConfig.restartScript + "' does not exist! Stopping server." );
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-
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- // Actually shutdown
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- try
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- {
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- MinecraftServer.getServer().close();
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- } catch ( Throwable t )
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- {
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}
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- }
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- System.exit( 0 );
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- } catch ( Exception ex )
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+ };
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+
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+ shutdownHook.setDaemon( true );
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+ Runtime.getRuntime().addShutdownHook( shutdownHook );
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+ return true;
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+ } else
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{
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- ex.printStackTrace();
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+ return false;
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}
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}
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+ // Paper end
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+
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}
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