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Force commands to be dispatched synchronously

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[22:29:12] <Aikar> just add that
[22:29:17] <Aikar> that forces it fixed
[22:29:31] <Aikar> and then when his users spam him hell fix it :P
This commit is contained in:
Zach Brown 2016-01-12 23:00:58 -06:00
parent 314212b236
commit 56c14f8f07
1 changed files with 86 additions and 0 deletions
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Spigot-Server-Patches/0083-Ensure-commands-are-not-ran-async.patch Normal file
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@ -0,0 +1,86 @@
From 3d5bf73817dbd5e89595cc27a80a9cfe0b5860eb Mon Sep 17 00:00:00 2001
From: Aikar <aikar@aikar.co>
Date: Wed, 8 Oct 2014 19:51:28 -0400
Subject: [PATCH] Ensure commands are not ran async
Plugins calling Player.chat("/foo") or Server.dispatchCommand() could
trigger the server to execute a command while on another thread.
These commands would then process EXPECTING to be on the main thread, leaving to
very hard to trace concurrency issues.
This change will synchronize the command execution back to the main thread, causing a
big slowdown in execution but throwing an exception at same time to raise awareness
that it is happening so that plugin authors can fix their code to stop executing commands async.
diff --git a/src/main/java/net/minecraft/server/PlayerConnection.java b/src/main/java/net/minecraft/server/PlayerConnection.java
index 1138042..4391ad7 100644
--- a/src/main/java/net/minecraft/server/PlayerConnection.java
+++ b/src/main/java/net/minecraft/server/PlayerConnection.java
@@ -1079,6 +1079,29 @@ public class PlayerConnection implements PacketListenerPlayIn, IUpdatePlayerList
}
if (!async && s.startsWith("/")) {
+ // PaperSpigot Start
+ if (!org.bukkit.Bukkit.isPrimaryThread()) {
+ final String fCommandLine = s;
+ MinecraftServer.LOGGER.log(org.apache.logging.log4j.Level.ERROR, "Command Dispatched Async: " + fCommandLine);
+ MinecraftServer.LOGGER.log(org.apache.logging.log4j.Level.ERROR, "Please notify author of plugin causing this execution to fix this bug! see: http://bit.ly/1oSiM6C", new Throwable());
+ Waitable wait = new Waitable() {
+ @Override
+ protected Object evaluate() {
+ chat(fCommandLine, false);
+ return null;
+ }
+ };
+ minecraftServer.processQueue.add(wait);
+ try {
+ wait.get();
+ return;
+ } catch (InterruptedException e) {
+ Thread.currentThread().interrupt(); // This is proper habit for java. If we aren't handling it, pass it on!
+ } catch (Exception e) {
+ throw new RuntimeException("Exception processing chat command", e.getCause());
+ }
+ }
+ // PaperSpigot End
this.handleCommand(s);
} else if (this.player.getChatFlags() == EntityHuman.EnumChatVisibility.SYSTEM) {
// Do nothing, this is coming from a plugin
diff --git a/src/main/java/org/bukkit/craftbukkit/CraftServer.java b/src/main/java/org/bukkit/craftbukkit/CraftServer.java
index 97f9f96..a54b3e8 100644
--- a/src/main/java/org/bukkit/craftbukkit/CraftServer.java
+++ b/src/main/java/org/bukkit/craftbukkit/CraftServer.java
@@ -639,6 +639,29 @@ public final class CraftServer implements Server {
Validate.notNull(sender, "Sender cannot be null");
Validate.notNull(commandLine, "CommandLine cannot be null");
+ // PaperSpigot Start
+ if (!Bukkit.isPrimaryThread()) {
+ final CommandSender fSender = sender;
+ final String fCommandLine = commandLine;
+ Bukkit.getLogger().log(Level.SEVERE, "Command Dispatched Async: " + commandLine);
+ Bukkit.getLogger().log(Level.SEVERE, "Please notify author of plugin causing this execution to fix this bug! see: http://bit.ly/1oSiM6C", new Throwable());
+ org.bukkit.craftbukkit.util.Waitable<Boolean> wait = new org.bukkit.craftbukkit.util.Waitable<Boolean>() {
+ @Override
+ protected Boolean evaluate() {
+ return dispatchCommand(fSender, fCommandLine);
+ }
+ };
+ net.minecraft.server.MinecraftServer.getServer().processQueue.add(wait);
+ try {
+ return wait.get();
+ } catch (InterruptedException e) {
+ Thread.currentThread().interrupt(); // This is proper habit for java. If we aren't handling it, pass it on!
+ } catch (Exception e) {
+ throw new RuntimeException("Exception processing dispatch command", e.getCause());
+ }
+ }
+ // PaperSpigot End
+
if (commandMap.dispatch(sender, commandLine)) {
return true;
}
--
2.7.0