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Spigot still maintains some partial implementation of "tick skipping", a practice in which the MinecraftServer.currentTick field is updated not by an increment of one per actual tick, but instead set to System.currentTimeMillis() / 50. This behaviour means that the tracked tick may "skip" a tick value in case a previous tick took more than the expected 50ms. To compensate for this in important paths, spigot/craftbukkit implements "wall-time". Instead of incrementing/decrementing ticks on block entities/entities by one for each call to their tick() method, they instead increment/decrement important values, like an ItemEntity's age or pickupDelay, by the difference of `currentTick - lastTick`, where `lastTick` is the value of `currentTick` during the last tick() call. These "fixes" however do not play nicely with minecraft's simulation distance as entities/block entities implementing the above behaviour would "catch up" their values when moving from a non-ticking chunk to a ticking one as their `lastTick` value remains stuck on the last tick in a ticking chunk and hence lead to a large "catch up" once ticked again. Paper completely removes the "tick skipping" behaviour (See patch "Further-improve-server-tick-loop"), making the above precautions completely unnecessary, which also rids paper of the previous described incompatibility with non-ticking chunks.
32 lines
1.8 KiB
Diff
32 lines
1.8 KiB
Diff
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: stonar96 <minecraft.stonar96@gmail.com>
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Date: Sun, 12 Sep 2021 00:14:21 +0200
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Subject: [PATCH] Check requirement before suggesting root nodes
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Child nodes are handled by CommandDispatcher#parse checking
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requirements.
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Vanilla clients only send ServerboundCommandSuggestionPacket when
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encountering a command node with ASK_SERVER suggestions, however a
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modified client can send this packet whenever it wants.
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diff --git a/src/main/java/com/mojang/brigadier/CommandDispatcher.java b/src/main/java/com/mojang/brigadier/CommandDispatcher.java
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index 858e41fba7dc285dd21a93f3918cc5de3887df5f..92848b64a78fce7a92e1657c2da6fc5ee53eea44 100644
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--- a/src/main/java/com/mojang/brigadier/CommandDispatcher.java
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+++ b/src/main/java/com/mojang/brigadier/CommandDispatcher.java
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@@ -538,10 +538,14 @@ public class CommandDispatcher<S> {
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int i = 0;
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for (final CommandNode<S> node : parent.getChildren()) {
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CompletableFuture<Suggestions> future = Suggestions.empty();
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+ // Paper start - Don't suggest if the requirement isn't met
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+ if (parent != this.root || node.canUse(context.getSource())) {
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try {
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- if (node.canUse(parse.getContext().getSource())) future = node.listSuggestions(context.build(truncatedInput), new SuggestionsBuilder(truncatedInput, truncatedInputLowerCase, start)); // CraftBukkit
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+ future = node.listSuggestions(context.build(truncatedInput), new SuggestionsBuilder(truncatedInput, truncatedInputLowerCase, start)); // CraftBukkit
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} catch (final CommandSyntaxException ignored) {
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}
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+ }
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+ // Paper end - Don't suggest if the requirement isn't met
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futures[i++] = future;
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}
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