Paper/patches/unapplied/server/0133-Properly-handle-async-calls-to-restart-the-server.patch

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From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Zach Brown <zach.brown@destroystokyo.com>
Date: Fri, 12 May 2017 23:34:11 -0500
Subject: [PATCH] Properly handle async calls to restart the server
The watchdog thread calls the server restart function asynchronously. Prior to
this change, it attempted to do several non-safe operations from the watchdog
thread, rather than the main. Specifically, because of a separate upstream change,
it causes player entities to be ticked asynchronously, among other things.
This is dangerous.
This patch moves the old handling into a synchronous variant, for calls from the
restart command, and adds separate handling for async calls, such as those from
the watchdog thread.
When calling from the watchdog thread, we cannot assume the main thread is in a
tickable state; it may be completely deadlocked. In order to handle this, we mark
the server as stopping, in order to account for situations where the server should
complete a tick reasonbly soon, i.e. 99% of cases.
Should the server not enter a state where it is stopping within 10 seconds, We
will assume that the server has in fact deadlocked and will proceed to force
kill the server.
This modification does not force restart the server should we actually enter a
deadlocked state where the server is stopping, whereas this will in most cases
exit within a reasonable amount of time, to put a fixed limit on a process that
will have plugins and worlds saving to the disk has a high potential to result
in corruption/dataloss.
diff --git a/src/main/java/net/minecraft/server/MinecraftServer.java b/src/main/java/net/minecraft/server/MinecraftServer.java
index e845baf287da216bc5c1d2588b8e720212318266..d9ceef3d9694ab85f807a732789b2871bb734e50 100644
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--- a/src/main/java/net/minecraft/server/MinecraftServer.java
+++ b/src/main/java/net/minecraft/server/MinecraftServer.java
@@ -237,6 +237,7 @@ public abstract class MinecraftServer extends ReentrantBlockableEventLoop<TickTa
private Map<ResourceKey<Level>, ServerLevel> levels;
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private PlayerList playerList;
private volatile boolean running;
+ private volatile boolean isRestarting = false; // Paper - flag to signify we're attempting to restart
private boolean stopped;
private int tickCount;
protected final Proxy proxy;
@@ -905,7 +906,7 @@ public abstract class MinecraftServer extends ReentrantBlockableEventLoop<TickTa
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if (this.playerList != null) {
MinecraftServer.LOGGER.info("Saving players");
this.playerList.saveAll();
- this.playerList.removeAll();
+ 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
}
@@ -956,6 +957,12 @@ public abstract class MinecraftServer extends ReentrantBlockableEventLoop<TickTa
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}
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public void halt(boolean waitForShutdown) {
+ // Paper start - allow passing of the intent to restart
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+ this.safeShutdown(waitForShutdown, false);
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+ }
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+ public void safeShutdown(boolean waitForShutdown, boolean isRestarting) {
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+ this.isRestarting = isRestarting;
+ // Paper end
this.running = false;
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if (waitForShutdown) {
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try {
diff --git a/src/main/java/net/minecraft/server/players/PlayerList.java b/src/main/java/net/minecraft/server/players/PlayerList.java
Updated Upstream (Bukkit/CraftBukkit/Spigot) (#9188) * Updated Upstream (Bukkit/CraftBukkit/Spigot) Upstream has released updates that appear to apply and compile correctly. This update has not been tested by PaperMC and as with ANY update, please do your own testing Bukkit Changes: 2fcba9b2 SPIGOT-7347: Add missing documentation and details to ShapedRecipe c278419d PR-854: Move getHighestBlockYAt methods from World to RegionAccessor 201399fb PR-853: Add API for directly setting Display transformation matrices ecfa559a PR-849: Add InventoryView#setTitle 653d7edb SPIGOT-519: Add TNTPrimeEvent 22fccc09 PR-846: Add method to get chunk load level a070a52c PR-844: Add methods to convert Vector to and from JOML vectors cc7111fe PR-276: Add accessors to Wither's invulnerability ticks 777d24e9 SPIGOT-7209: Accessors and events for player's exp cooldown ccb2d01b SPIGOT-6308: Deprecate the location name property of map items cd04a31b PR-780: Add PlayerSpawnChangeEvent 7d1f5b64 SPIGOT-6780: Improve documentation for World#spawnFallingBlock 5696668a SPIGOT-6885: Add test and easier to debug code for reference in yaml configuration comments 2e13cff7 PR-589: Expand the FishHook API 2c7d3da5 PR-279: Minor edits to various Javadocs CraftBukkit Changes: 01b2e1af4 SPIGOT-7346: Disallow players from executing commands after disconnecting 7fe5ee022 PR-1186: Move getHighestBlockYAt methods from World to RegionAccessor bcc85ef67 PR-1185: Add API for directly setting Display transformation matrices a7cfc778f PR-1176: Add InventoryView#setTitle 563d42226 SPIGOT-519: Add TNTPrimeEvent ccbc6abca Add test for Chunk.LoadLevel mirroring 2926e0513 PR-1171: Add method to get chunk load level 63cad7f84 PR-375: Add accessors to Wither's invulnerability ticks bfd8b1ac8 SPIGOT-7209: Accessors and events for player's exp cooldown f92a41c39 PR-1181: Consolidate Location conversion code 10f866759 SPIGOT-6308: Deprecate the location name property of map items 82f7b658a PR-1095: Add PlayerSpawnChangeEvent b421af7e4 PR-808: Expand the FishHook API 598ad7b3f Increase outdated build delay Spigot Changes: d1bd3bd2 Rebuild patches e4265cc8 SPIGOT-7297: Entity Tracking Range option for Display entities * Work around javac bug * Call PlayerSpawnChangeEvent * Updated Upstream (Bukkit/CraftBukkit/Spigot) Upstream has released updates that appear to apply and compile correctly. This update has not been tested by PaperMC and as with ANY update, please do your own testing Bukkit Changes: 2fcba9b2 SPIGOT-7347: Add missing documentation and details to ShapedRecipe c278419d PR-854: Move getHighestBlockYAt methods from World to RegionAccessor 201399fb PR-853: Add API for directly setting Display transformation matrices CraftBukkit Changes: 01b2e1af4 SPIGOT-7346: Disallow players from executing commands after disconnecting 7fe5ee022 PR-1186: Move getHighestBlockYAt methods from World to RegionAccessor bcc85ef67 PR-1185: Add API for directly setting Display transformation matrices Spigot Changes: 7da74dae Rebuild patches
2023-05-12 13:10:08 +02:00
index 4066a3c6b032d13e4c303b10b012f1224925710f..a34c9da6dbd37ab01385b768c06fef418de9c7c8 100644
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--- a/src/main/java/net/minecraft/server/players/PlayerList.java
+++ b/src/main/java/net/minecraft/server/players/PlayerList.java
Updated Upstream (Bukkit/CraftBukkit/Spigot) (#9188) * Updated Upstream (Bukkit/CraftBukkit/Spigot) Upstream has released updates that appear to apply and compile correctly. This update has not been tested by PaperMC and as with ANY update, please do your own testing Bukkit Changes: 2fcba9b2 SPIGOT-7347: Add missing documentation and details to ShapedRecipe c278419d PR-854: Move getHighestBlockYAt methods from World to RegionAccessor 201399fb PR-853: Add API for directly setting Display transformation matrices ecfa559a PR-849: Add InventoryView#setTitle 653d7edb SPIGOT-519: Add TNTPrimeEvent 22fccc09 PR-846: Add method to get chunk load level a070a52c PR-844: Add methods to convert Vector to and from JOML vectors cc7111fe PR-276: Add accessors to Wither's invulnerability ticks 777d24e9 SPIGOT-7209: Accessors and events for player's exp cooldown ccb2d01b SPIGOT-6308: Deprecate the location name property of map items cd04a31b PR-780: Add PlayerSpawnChangeEvent 7d1f5b64 SPIGOT-6780: Improve documentation for World#spawnFallingBlock 5696668a SPIGOT-6885: Add test and easier to debug code for reference in yaml configuration comments 2e13cff7 PR-589: Expand the FishHook API 2c7d3da5 PR-279: Minor edits to various Javadocs CraftBukkit Changes: 01b2e1af4 SPIGOT-7346: Disallow players from executing commands after disconnecting 7fe5ee022 PR-1186: Move getHighestBlockYAt methods from World to RegionAccessor bcc85ef67 PR-1185: Add API for directly setting Display transformation matrices a7cfc778f PR-1176: Add InventoryView#setTitle 563d42226 SPIGOT-519: Add TNTPrimeEvent ccbc6abca Add test for Chunk.LoadLevel mirroring 2926e0513 PR-1171: Add method to get chunk load level 63cad7f84 PR-375: Add accessors to Wither's invulnerability ticks bfd8b1ac8 SPIGOT-7209: Accessors and events for player's exp cooldown f92a41c39 PR-1181: Consolidate Location conversion code 10f866759 SPIGOT-6308: Deprecate the location name property of map items 82f7b658a PR-1095: Add PlayerSpawnChangeEvent b421af7e4 PR-808: Expand the FishHook API 598ad7b3f Increase outdated build delay Spigot Changes: d1bd3bd2 Rebuild patches e4265cc8 SPIGOT-7297: Entity Tracking Range option for Display entities * Work around javac bug * Call PlayerSpawnChangeEvent * Updated Upstream (Bukkit/CraftBukkit/Spigot) Upstream has released updates that appear to apply and compile correctly. This update has not been tested by PaperMC and as with ANY update, please do your own testing Bukkit Changes: 2fcba9b2 SPIGOT-7347: Add missing documentation and details to ShapedRecipe c278419d PR-854: Move getHighestBlockYAt methods from World to RegionAccessor 201399fb PR-853: Add API for directly setting Display transformation matrices CraftBukkit Changes: 01b2e1af4 SPIGOT-7346: Disallow players from executing commands after disconnecting 7fe5ee022 PR-1186: Move getHighestBlockYAt methods from World to RegionAccessor bcc85ef67 PR-1185: Add API for directly setting Display transformation matrices Spigot Changes: 7da74dae Rebuild patches
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@@ -1174,8 +1174,15 @@ public abstract class PlayerList {
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}
public void removeAll() {
+ // Paper start - Extract method to allow for restarting flag
+ this.removeAll(false);
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+ }
+
+ public void removeAll(boolean isRestarting) {
+ // Paper end
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// CraftBukkit start - disconnect safely
for (ServerPlayer player : this.players) {
+ if (isRestarting) player.connection.disconnect(org.spigotmc.SpigotConfig.restartMessage); else // Paper
player.connection.disconnect(this.server.server.shutdownMessage()); // CraftBukkit - add custom shutdown message // Paper - Adventure
}
// CraftBukkit end
diff --git a/src/main/java/org/spigotmc/RestartCommand.java b/src/main/java/org/spigotmc/RestartCommand.java
index 94d8ba376cd1f024b244654cac9bb62bb19e3060..a142a56a920e153ed84c08cece993f10d76f7793 100644
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--- a/src/main/java/org/spigotmc/RestartCommand.java
+++ b/src/main/java/org/spigotmc/RestartCommand.java
@@ -46,86 +46,134 @@ public class RestartCommand extends Command
org.spigotmc.AsyncCatcher.shuttingDown = true; // Paper
try
{
- String[] split = restartScript.split( " " );
- if ( split.length > 0 && new File( split[0] ).isFile() )
+ // Paper - extract method and cleanup
+ boolean isRestarting = addShutdownHook( restartScript );
+ if ( isRestarting )
{
- System.out.println( "Attempting to restart with " + restartScript );
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+ System.out.println( "Attempting to restart with " + SpigotConfig.restartScript );
+ } else
+ {
+ System.out.println( "Startup script '" + SpigotConfig.restartScript + "' does not exist! Stopping server." );
+ }
+ // Stop the watchdog
+ WatchdogThread.doStop();
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- // Disable Watchdog
- WatchdogThread.doStop();
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+ shutdownServer( isRestarting );
+ // Paper end
+ } catch ( Exception ex )
+ {
+ ex.printStackTrace();
+ }
+ }
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- // Kick all players
- for ( ServerPlayer p : (List<ServerPlayer>) MinecraftServer.getServer().getPlayerList().players )
- {
- p.connection.disconnect(SpigotConfig.restartMessage);
- }
- // 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().getConnection().stop();
+ // Paper start - sync copied from above with minor changes, async added
+ private static void shutdownServer(boolean isRestarting)
+ {
+ if ( MinecraftServer.getServer().isSameThread() )
+ {
+ // Kick all players
+ for ( ServerPlayer p : com.google.common.collect.ImmutableList.copyOf( MinecraftServer.getServer().getPlayerList().players ) )
+ {
+ p.connection.disconnect(SpigotConfig.restartMessage);
+ }
+ // Give the socket a chance to send the packets
+ try
+ {
+ Thread.sleep( 100 );
+ } catch ( InterruptedException ex )
+ {
+ }
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- // Give time for it to kick in
- try
- {
- Thread.sleep( 100 );
- } catch ( InterruptedException ex )
- {
- }
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+ closeSocket();
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- // Actually shutdown
- try
- {
- MinecraftServer.getServer().close();
- } catch ( Throwable t )
- {
- }
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+ // Actually shutdown
+ try
+ {
+ MinecraftServer.getServer().close(); // calls stop()
+ } catch ( Throwable t )
+ {
+ }
+
+ // Actually stop the JVM
+ System.exit( 0 );
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- // This will be done AFTER the server has completely halted
- Thread shutdownHook = new Thread()
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+ } else
+ {
+ // Mark the server to shutdown at the end of the tick
+ MinecraftServer.getServer().safeShutdown( false, isRestarting );
+
+ // wait 10 seconds to see if we're actually going to try shutdown
+ try
+ {
+ Thread.sleep( 10000 );
+ }
+ catch (InterruptedException ignored)
+ {
+ }
+
+ // Check if we've actually hit a state where the server is going to safely shutdown
+ // if we have, let the server stop as usual
+ if (MinecraftServer.getServer().isStopped()) return;
+
+ // If the server hasn't stopped by now, assume worse case and kill
+ closeSocket();
+ System.exit( 0 );
+ }
+ }
+ // Paper end
+
+ // Paper - Split from moved code
+ private static void closeSocket()
+ {
+ // Close the socket so we can rebind with the new process
+ MinecraftServer.getServer().getConnection().stop();
+
+ // Give time for it to kick in
+ try
+ {
+ Thread.sleep( 100 );
+ } catch ( InterruptedException ex )
+ {
+ }
+ }
+ // Paper end
+
+ // Paper start - copied from above and modified to return if the hook registered
+ private static boolean addShutdownHook(String restartScript)
+ {
+ String[] split = restartScript.split( " " );
+ if ( split.length > 0 && new File( split[0] ).isFile() )
+ {
+ Thread shutdownHook = new Thread()
+ {
+ @Override
+ public void run()
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{
- @Override
- public void run()
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+ try
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{
- try
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+ String os = System.getProperty( "os.name" ).toLowerCase(java.util.Locale.ENGLISH);
+ if ( os.contains( "win" ) )
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{
- String os = System.getProperty( "os.name" ).toLowerCase(java.util.Locale.ENGLISH);
- if ( os.contains( "win" ) )
- {
- Runtime.getRuntime().exec( "cmd /c start " + restartScript );
- } else
- {
- Runtime.getRuntime().exec( "sh " + restartScript );
- }
- } catch ( Exception e )
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+ Runtime.getRuntime().exec( "cmd /c start " + restartScript );
+ } else
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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 )
+ {
+ e.printStackTrace();
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}
- };
-
- shutdownHook.setDaemon( true );
- Runtime.getRuntime().addShutdownHook( shutdownHook );
- } else
- {
- System.out.println( "Startup script '" + SpigotConfig.restartScript + "' does not exist! Stopping server." );
-
- // Actually shutdown
- try
- {
- MinecraftServer.getServer().close();
- } catch ( Throwable t )
- {
}
- }
- System.exit( 0 );
- } catch ( Exception ex )
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+ };
+
+ shutdownHook.setDaemon( true );
+ Runtime.getRuntime().addShutdownHook( shutdownHook );
+ return true;
+ } else
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{
- ex.printStackTrace();
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+ return false;
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}
}
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+ // Paper end
+
}