PaperMC/patches/server/0604-Check-requirement-before-suggesting-root-nodes.patch
Spottedleaf 8c5b837e05 Rework async chunk api implementation
Firstly, the old methods all routed to the CompletableFuture method.
However, the CF method could not guarantee that if the caller
was off-main that the future would be "completed" on-main. Since
the callback methods used the CF one, this meant that the callback
methods did not guarantee that the callbacks were to be called on
the main thread.

Now, all methods route to getChunkAtAsync(x, z, gen, urgent, cb)
so that the methods with the callback are guaranteed to invoke
the callback on the main thread. The CF behavior remains unchanged;
it may still appear to complete on main if invoked off-main.

Secondly, remove the scheduleOnMain invocation in the async
chunk completion. This unnecessarily delays the callback
by 1 tick.

Thirdly, add getChunksAtAsync(minX, minZ, maxX, maxZ, ...) which
will load chunks within an area. This method is provided as a helper
as keeping all chunks loaded within an area can be complicated to
implement for plugins (due to the lacking ticket API), and is
already implemented internally anyways.

Fourthly, remove the ticket addition that occured with getChunkAt
and getChunkAtAsync. The ticket addition may delay the unloading
of the chunk unnecessarily. It also fixes a very rare timing bug
where the future/callback would be completed after the chunk
unloads.
2024-11-18 23:00:59 -08:00

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Diff

From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: stonar96 <minecraft.stonar96@gmail.com>
Date: Sun, 12 Sep 2021 00:14:21 +0200
Subject: [PATCH] Check requirement before suggesting root nodes
Child nodes are handled by CommandDispatcher#parse checking
requirements.
Vanilla clients only send ServerboundCommandSuggestionPacket when
encountering a command node with ASK_SERVER suggestions, however a
modified client can send this packet whenever it wants.
diff --git a/src/main/java/com/mojang/brigadier/CommandDispatcher.java b/src/main/java/com/mojang/brigadier/CommandDispatcher.java
index 858e41fba7dc285dd21a93f3918cc5de3887df5f..92848b64a78fce7a92e1657c2da6fc5ee53eea44 100644
--- a/src/main/java/com/mojang/brigadier/CommandDispatcher.java
+++ b/src/main/java/com/mojang/brigadier/CommandDispatcher.java
@@ -538,10 +538,14 @@ public class CommandDispatcher<S> {
int i = 0;
for (final CommandNode<S> node : parent.getChildren()) {
CompletableFuture<Suggestions> future = Suggestions.empty();
+ // Paper start - Don't suggest if the requirement isn't met
+ if (parent != this.root || node.canUse(context.getSource())) {
try {
- if (node.canUse(parse.getContext().getSource())) future = node.listSuggestions(context.build(truncatedInput), new SuggestionsBuilder(truncatedInput, truncatedInputLowerCase, start)); // CraftBukkit
+ future = node.listSuggestions(context.build(truncatedInput), new SuggestionsBuilder(truncatedInput, truncatedInputLowerCase, start)); // CraftBukkit
} catch (final CommandSyntaxException ignored) {
}
+ }
+ // Paper end - Don't suggest if the requirement isn't met
futures[i++] = future;
}