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c5a10665b8
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.
85 lines
5.5 KiB
Diff
85 lines
5.5 KiB
Diff
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: Jake Potrebic <jake.m.potrebic@gmail.com>
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Date: Wed, 22 Dec 2021 09:51:48 -0800
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Subject: [PATCH] Fix sticky pistons and BlockPistonRetractEvent
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There is an explicit check in the handling code for empty pistons that
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prevents sticky pistons from firing the event. However when we look back
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at the history we see that this check was originally added so that ONLY
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sticky pistons would fire the retract event. I'm not sure why.
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https://hub.spigotmc.org/stash/projects/SPIGOT/repos/craftbukkit/commits/1092acbddf07edfa4100bc6824504ac75088e913
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Over the course of several updates, the meaning of that field appears to
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have changed from "is NOT sticky" to "is sticky". So now its having the
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opposite effect. Only normal pistons fire the retraction event. And like
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all things in CB, it's just been carried around since.
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If we are to believe the history, the correct fix for this issue is to
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flip it so it only fires for sticky pistons, but that puts us in a
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bind. It's already firing for non-sticky pistons, changing it now would
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likely result in breakage. Furthermore, there is little documentation as
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to WHY that was ever intended to be the case.
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Instead we opt to remove the check entirely so that the event fires for
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all piston types.
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Co-authored-by: Zach Brown <zach@zachbr.io>
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Co-authored-by: Madeline Miller <mnmiller1@me.com>
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diff --git a/src/main/java/net/minecraft/world/level/block/piston/PistonBaseBlock.java b/src/main/java/net/minecraft/world/level/block/piston/PistonBaseBlock.java
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index 2f2c9fb65d4cc8bd40303216e03c5c1956305ff4..e6bfbe2588e0c2a1be14e38d654e889d392ad4db 100644
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--- a/src/main/java/net/minecraft/world/level/block/piston/PistonBaseBlock.java
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+++ b/src/main/java/net/minecraft/world/level/block/piston/PistonBaseBlock.java
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@@ -160,15 +160,15 @@ public class PistonBaseBlock extends DirectionalBlock {
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}
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// CraftBukkit start
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- if (!this.isSticky) {
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- org.bukkit.block.Block block = world.getWorld().getBlockAt(pos.getX(), pos.getY(), pos.getZ());
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- BlockPistonRetractEvent event = new BlockPistonRetractEvent(block, ImmutableList.<org.bukkit.block.Block>of(), CraftBlock.notchToBlockFace(enumdirection));
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- world.getCraftServer().getPluginManager().callEvent(event);
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-
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- if (event.isCancelled()) {
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- return;
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- }
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- }
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+ // if (!this.isSticky) { // Paper - Fix sticky pistons and BlockPistonRetractEvent; Move further down
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+ // org.bukkit.block.Block block = world.getWorld().getBlockAt(pos.getX(), pos.getY(), pos.getZ());
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+ // BlockPistonRetractEvent event = new BlockPistonRetractEvent(block, ImmutableList.<org.bukkit.block.Block>of(), CraftBlock.notchToBlockFace(enumdirection));
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+ // world.getCraftServer().getPluginManager().callEvent(event);
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+ //
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+ // if (event.isCancelled()) {
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+ // return;
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+ // }
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+ // }
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// PAIL: checkME - what happened to setTypeAndData?
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// CraftBukkit end
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world.blockEvent(pos, this, b0, enumdirection.get3DDataValue());
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@@ -245,6 +245,13 @@ public class PistonBaseBlock extends DirectionalBlock {
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BlockState iblockdata2 = (BlockState) ((BlockState) Blocks.MOVING_PISTON.defaultBlockState().setValue(MovingPistonBlock.FACING, enumdirection)).setValue(MovingPistonBlock.TYPE, this.isSticky ? PistonType.STICKY : PistonType.DEFAULT);
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+ // Paper start - Fix sticky pistons and BlockPistonRetractEvent; Move empty piston retract call to fix multiple event fires
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+ if (!this.isSticky) {
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+ if (!new BlockPistonRetractEvent(CraftBlock.at(world, pos), java.util.Collections.emptyList(), CraftBlock.notchToBlockFace(enumdirection)).callEvent()) {
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+ return false;
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+ }
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+ }
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+ // Paper end - Fix sticky pistons and BlockPistonRetractEvent
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world.setBlock(pos, iblockdata2, 20);
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world.setBlockEntity(MovingPistonBlock.newMovingBlockEntity(pos, iblockdata2, (BlockState) this.defaultBlockState().setValue(PistonBaseBlock.FACING, Direction.from3DDataValue(data & 7)), enumdirection, false, true));
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world.blockUpdated(pos, iblockdata2.getBlock());
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@@ -271,6 +278,13 @@ public class PistonBaseBlock extends DirectionalBlock {
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if (type == 1 && !iblockdata3.isAir() && PistonBaseBlock.isPushable(iblockdata3, world, blockposition1, enumdirection.getOpposite(), false, enumdirection) && (iblockdata3.getPistonPushReaction() == PushReaction.NORMAL || iblockdata3.is(Blocks.PISTON) || iblockdata3.is(Blocks.STICKY_PISTON))) {
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this.moveBlocks(world, pos, enumdirection, false);
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} else {
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+ // Paper start - Fix sticky pistons and BlockPistonRetractEvent; fire BlockPistonRetractEvent for sticky pistons retracting nothing (air)
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+ if (type == TRIGGER_CONTRACT && iblockdata2.isAir()) {
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+ if (!new BlockPistonRetractEvent(CraftBlock.at(world, pos), java.util.Collections.emptyList(), CraftBlock.notchToBlockFace(enumdirection)).callEvent()) {
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+ return false;
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+ }
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+ }
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+ // Paper end - Fix sticky pistons and BlockPistonRetractEvent
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world.removeBlock(pos.relative(enumdirection), false);
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}
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}
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