Paper/patches/server/0819-Fix-upstreams-block-state-factories.patch

From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Jake Potrebic <jake.m.potrebic@gmail.com>
Date: Wed, 6 Oct 2021 20:50:48 -0700
Subject: [PATCH] Fix upstreams block state factories

Sometimes, blocks are changed and then logic is called before the associated
tile entity is removed. When this happens, the factories were relying on the
block at the position, not the tile entity. This change prioritizes using the
tile entity type to determine the block state factory and falls back on
the material type of the block at that location.

diff --git a/src/main/java/net/minecraft/world/level/block/entity/BlockEntity.java b/src/main/java/net/minecraft/world/level/block/entity/BlockEntity.java
index 38c4dac82793930777eaf0189c5534234a9162ed..9b4a464fe820effa906af486cf71a74e283ccd4e 100644
--- a/src/main/java/net/minecraft/world/level/block/entity/BlockEntity.java
+++ b/src/main/java/net/minecraft/world/level/block/entity/BlockEntity.java
@@ -232,7 +232,7 @@ public abstract class BlockEntity implements net.minecraft.server.KeyedObject {
         // Paper end
         if (this.level == null) return null;
         org.bukkit.block.Block block = this.level.getWorld().getBlockAt(this.worldPosition.getX(), this.worldPosition.getY(), this.worldPosition.getZ());
-        if (block.getType() == org.bukkit.Material.AIR) return null;
+        // if (block.getType() == org.bukkit.Material.AIR) return null; // Paper - actually get the tile entity if it still exists
         org.bukkit.block.BlockState state = block.getState(useSnapshot); // Paper
         if (state instanceof InventoryHolder) return (InventoryHolder) state;
         return null;
diff --git a/src/main/java/org/bukkit/craftbukkit/block/CraftBlockStates.java b/src/main/java/org/bukkit/craftbukkit/block/CraftBlockStates.java
index b794e04036df00dd9633b9bd808591f499238387..0356c33bc14bef73a7468d5360ea5cd309d5f623 100644
--- a/src/main/java/org/bukkit/craftbukkit/block/CraftBlockStates.java
+++ b/src/main/java/org/bukkit/craftbukkit/block/CraftBlockStates.java
@@ -19,6 +19,7 @@ import net.minecraft.world.level.block.entity.BeehiveBlockEntity;
 import net.minecraft.world.level.block.entity.BellBlockEntity;
 import net.minecraft.world.level.block.entity.BlastFurnaceBlockEntity;
 import net.minecraft.world.level.block.entity.BlockEntity;
+import net.minecraft.world.level.block.entity.BlockEntityType; // Paper
 import net.minecraft.world.level.block.entity.BrewingStandBlockEntity;
 import net.minecraft.world.level.block.entity.CampfireBlockEntity;
 import net.minecraft.world.level.block.entity.ChestBlockEntity;
@@ -106,183 +107,54 @@ public final class CraftBlockStates {
         @Override
         public CraftBlockState createBlockState(World world, BlockPos blockPosition, net.minecraft.world.level.block.state.BlockState blockData, BlockEntity tileEntity) {
             // When a block is being destroyed, the TileEntity may temporarily still exist while the block's type has already been set to AIR. We ignore the TileEntity in this case.
-            Preconditions.checkState(tileEntity == null || CraftMagicNumbers.getMaterial(blockData.getBlock()) == Material.AIR, "Unexpected BlockState for %s", CraftMagicNumbers.getMaterial(blockData.getBlock()));
+            Preconditions.checkState(tileEntity == null/* || CraftMagicNumbers.getMaterial(blockData.getBlock()) == Material.AIR*/, "Unexpected BlockState for %s", CraftMagicNumbers.getMaterial(blockData.getBlock())); // Paper - don't ignore the TileEntity while its still valid
             return new CraftBlockState(world, blockPosition, blockData);
         }
     };
+    // Paper start
+    private static final Map<BlockEntityType<?>, BlockStateFactory<?>> FACTORIES_BY_BLOCK_ENTITY_TYPE = new HashMap<>();
+    private static void register(BlockEntityType<?> type, BlockStateFactory<?> factory) {
+        FACTORIES_BY_BLOCK_ENTITY_TYPE.put(type, factory);
+    }
+    // Paper end
 
     static {
-        register(
-                Arrays.asList(
-                        Material.ACACIA_SIGN,
-                        Material.ACACIA_WALL_SIGN,
-                        Material.BIRCH_SIGN,
-                        Material.BIRCH_WALL_SIGN,
-                        Material.CRIMSON_SIGN,
-                        Material.CRIMSON_WALL_SIGN,
-                        Material.DARK_OAK_SIGN,
-                        Material.DARK_OAK_WALL_SIGN,
-                        Material.JUNGLE_SIGN,
-                        Material.JUNGLE_WALL_SIGN,
-                        Material.OAK_SIGN,
-                        Material.OAK_WALL_SIGN,
-                        Material.SPRUCE_SIGN,
-                        Material.SPRUCE_WALL_SIGN,
-                        Material.WARPED_SIGN,
-                        Material.WARPED_WALL_SIGN
-                ), CraftSign.class, CraftSign::new, SignBlockEntity::new
-        );
-
-        register(
-                Arrays.asList(
-                        Material.CREEPER_HEAD,
-                        Material.CREEPER_WALL_HEAD,
-                        Material.DRAGON_HEAD,
-                        Material.DRAGON_WALL_HEAD,
-                        Material.PLAYER_HEAD,
-                        Material.PLAYER_WALL_HEAD,
-                        Material.SKELETON_SKULL,
-                        Material.SKELETON_WALL_SKULL,
-                        Material.WITHER_SKELETON_SKULL,
-                        Material.WITHER_SKELETON_WALL_SKULL,
-                        Material.ZOMBIE_HEAD,
-                        Material.ZOMBIE_WALL_HEAD
-                ), CraftSkull.class, CraftSkull::new, SkullBlockEntity::new
-        );
-
-        register(
-                Arrays.asList(
-                        Material.COMMAND_BLOCK,
-                        Material.REPEATING_COMMAND_BLOCK,
-                        Material.CHAIN_COMMAND_BLOCK
-                ), CraftCommandBlock.class, CraftCommandBlock::new, CommandBlockEntity::new
-        );
-
-        register(
-                Arrays.asList(
-                        Material.BLACK_BANNER,
-                        Material.BLACK_WALL_BANNER,
-                        Material.BLUE_BANNER,
-                        Material.BLUE_WALL_BANNER,
-                        Material.BROWN_BANNER,
-                        Material.BROWN_WALL_BANNER,
-                        Material.CYAN_BANNER,
-                        Material.CYAN_WALL_BANNER,
-                        Material.GRAY_BANNER,
-                        Material.GRAY_WALL_BANNER,
-                        Material.GREEN_BANNER,
-                        Material.GREEN_WALL_BANNER,
-                        Material.LIGHT_BLUE_BANNER,
-                        Material.LIGHT_BLUE_WALL_BANNER,
-                        Material.LIGHT_GRAY_BANNER,
-                        Material.LIGHT_GRAY_WALL_BANNER,
-                        Material.LIME_BANNER,
-                        Material.LIME_WALL_BANNER,
-                        Material.MAGENTA_BANNER,
-                        Material.MAGENTA_WALL_BANNER,
-                        Material.ORANGE_BANNER,
-                        Material.ORANGE_WALL_BANNER,
-                        Material.PINK_BANNER,
-                        Material.PINK_WALL_BANNER,
-                        Material.PURPLE_BANNER,
-                        Material.PURPLE_WALL_BANNER,
-                        Material.RED_BANNER,
-                        Material.RED_WALL_BANNER,
-                        Material.WHITE_BANNER,
-                        Material.WHITE_WALL_BANNER,
-                        Material.YELLOW_BANNER,
-                        Material.YELLOW_WALL_BANNER
-                ), CraftBanner.class, CraftBanner::new, BannerBlockEntity::new
-        );
-
-        register(
-                Arrays.asList(
-                        Material.SHULKER_BOX,
-                        Material.WHITE_SHULKER_BOX,
-                        Material.ORANGE_SHULKER_BOX,
-                        Material.MAGENTA_SHULKER_BOX,
-                        Material.LIGHT_BLUE_SHULKER_BOX,
-                        Material.YELLOW_SHULKER_BOX,
-                        Material.LIME_SHULKER_BOX,
-                        Material.PINK_SHULKER_BOX,
-                        Material.GRAY_SHULKER_BOX,
-                        Material.LIGHT_GRAY_SHULKER_BOX,
-                        Material.CYAN_SHULKER_BOX,
-                        Material.PURPLE_SHULKER_BOX,
-                        Material.BLUE_SHULKER_BOX,
-                        Material.BROWN_SHULKER_BOX,
-                        Material.GREEN_SHULKER_BOX,
-                        Material.RED_SHULKER_BOX,
-                        Material.BLACK_SHULKER_BOX
-                ), CraftShulkerBox.class, CraftShulkerBox::new, ShulkerBoxBlockEntity::new
-        );
-
-        register(
-                Arrays.asList(
-                        Material.BLACK_BED,
-                        Material.BLUE_BED,
-                        Material.BROWN_BED,
-                        Material.CYAN_BED,
-                        Material.GRAY_BED,
-                        Material.GREEN_BED,
-                        Material.LIGHT_BLUE_BED,
-                        Material.LIGHT_GRAY_BED,
-                        Material.LIME_BED,
-                        Material.MAGENTA_BED,
-                        Material.ORANGE_BED,
-                        Material.PINK_BED,
-                        Material.PURPLE_BED,
-                        Material.RED_BED,
-                        Material.WHITE_BED,
-                        Material.YELLOW_BED
-                ), CraftBed.class, CraftBed::new, BedBlockEntity::new
-        );
-
-        register(
-                Arrays.asList(
-                        Material.BEEHIVE,
-                        Material.BEE_NEST
-                ), CraftBeehive.class, CraftBeehive::new, BeehiveBlockEntity::new
-        );
-
-        register(
-                Arrays.asList(
-                        Material.CAMPFIRE,
-                        Material.SOUL_CAMPFIRE
-                ), CraftCampfire.class, CraftCampfire::new, CampfireBlockEntity::new
-        );
-
-        register(
-                Arrays.asList(
-                        Material.CHEST,
-                        Material.TRAPPED_CHEST
-                ), CraftChest.class, CraftChest::new, ChestBlockEntity::new
-        );
-
-        register(Material.BARREL, CraftBarrel.class, CraftBarrel::new, BarrelBlockEntity::new);
-        register(Material.BEACON, CraftBeacon.class, CraftBeacon::new, BeaconBlockEntity::new);
-        register(Material.BELL, CraftBell.class, CraftBell::new, BellBlockEntity::new);
-        register(Material.BLAST_FURNACE, CraftBlastFurnace.class, CraftBlastFurnace::new, BlastFurnaceBlockEntity::new);
-        register(Material.BREWING_STAND, CraftBrewingStand.class, CraftBrewingStand::new, BrewingStandBlockEntity::new);
-        register(Material.COMPARATOR, CraftComparator.class, CraftComparator::new, ComparatorBlockEntity::new);
-        register(Material.CONDUIT, CraftConduit.class, CraftConduit::new, ConduitBlockEntity::new);
-        register(Material.DAYLIGHT_DETECTOR, CraftDaylightDetector.class, CraftDaylightDetector::new, DaylightDetectorBlockEntity::new);
-        register(Material.DISPENSER, CraftDispenser.class, CraftDispenser::new, DispenserBlockEntity::new);
-        register(Material.DROPPER, CraftDropper.class, CraftDropper::new, DropperBlockEntity::new);
-        register(Material.ENCHANTING_TABLE, CraftEnchantingTable.class, CraftEnchantingTable::new, EnchantmentTableBlockEntity::new);
-        register(Material.ENDER_CHEST, CraftEnderChest.class, CraftEnderChest::new, EnderChestBlockEntity::new);
-        register(Material.END_GATEWAY, CraftEndGateway.class, CraftEndGateway::new, TheEndGatewayBlockEntity::new);
-        register(Material.END_PORTAL, CraftEndPortal.class, CraftEndPortal::new, TheEndPortalBlockEntity::new);
-        register(Material.FURNACE, CraftFurnaceFurnace.class, CraftFurnaceFurnace::new, FurnaceBlockEntity::new);
-        register(Material.HOPPER, CraftHopper.class, CraftHopper::new, HopperBlockEntity::new);
-        register(Material.JIGSAW, CraftJigsaw.class, CraftJigsaw::new, JigsawBlockEntity::new);
-        register(Material.JUKEBOX, CraftJukebox.class, CraftJukebox::new, JukeboxBlockEntity::new);
-        register(Material.LECTERN, CraftLectern.class, CraftLectern::new, LecternBlockEntity::new);
-        register(Material.MOVING_PISTON, CraftMovingPiston.class, CraftMovingPiston::new, PistonMovingBlockEntity::new);
-        register(Material.SCULK_SENSOR, CraftSculkSensor.class, CraftSculkSensor::new, SculkSensorBlockEntity::new);
-        register(Material.SMOKER, CraftSmoker.class, CraftSmoker::new, SmokerBlockEntity::new);
-        register(Material.SPAWNER, CraftCreatureSpawner.class, CraftCreatureSpawner::new, SpawnerBlockEntity::new);
-        register(Material.STRUCTURE_BLOCK, CraftStructureBlock.class, CraftStructureBlock::new, StructureBlockEntity::new);
+        // Paper start - simplify
+        register(BlockEntityType.SIGN, CraftSign.class, CraftSign::new);
+        register(BlockEntityType.SKULL, CraftSkull.class, CraftSkull::new);
+        register(BlockEntityType.COMMAND_BLOCK, CraftCommandBlock.class, CraftCommandBlock::new);
+        register(BlockEntityType.BANNER, CraftBanner.class, CraftBanner::new);
+        register(BlockEntityType.SHULKER_BOX, CraftShulkerBox.class, CraftShulkerBox::new);
+        register(BlockEntityType.BED, CraftBed.class, CraftBed::new);
+        register(BlockEntityType.BEEHIVE, CraftBeehive.class, CraftBeehive::new);
+        register(BlockEntityType.CAMPFIRE, CraftCampfire.class, CraftCampfire::new);
+        register(BlockEntityType.CHEST, CraftChest.class, CraftChest::new); // Paper - split up chests due to different block entity types
+        register(BlockEntityType.TRAPPED_CHEST, CraftChest.class, CraftChest::new); // Paper - split up chests due to different block entity types
+        register(BlockEntityType.BARREL, CraftBarrel.class, CraftBarrel::new);
+        register(BlockEntityType.BEACON, CraftBeacon.class, CraftBeacon::new);
+        register(BlockEntityType.BELL, CraftBell.class, CraftBell::new);
+        register(BlockEntityType.BLAST_FURNACE, CraftBlastFurnace.class, CraftBlastFurnace::new);
+        register(BlockEntityType.BREWING_STAND, CraftBrewingStand.class, CraftBrewingStand::new);
+        register(BlockEntityType.COMPARATOR, CraftComparator.class, CraftComparator::new);
+        register(BlockEntityType.CONDUIT, CraftConduit.class, CraftConduit::new);
+        register(BlockEntityType.DAYLIGHT_DETECTOR, CraftDaylightDetector.class, CraftDaylightDetector::new);
+        register(BlockEntityType.DISPENSER, CraftDispenser.class, CraftDispenser::new);
+        register(BlockEntityType.DROPPER, CraftDropper.class, CraftDropper::new);
+        register(BlockEntityType.ENCHANTING_TABLE, CraftEnchantingTable.class, CraftEnchantingTable::new);
+        register(BlockEntityType.ENDER_CHEST, CraftEnderChest.class, CraftEnderChest::new);
+        register(BlockEntityType.END_GATEWAY, CraftEndGateway.class, CraftEndGateway::new);
+        register(BlockEntityType.END_PORTAL, CraftEndPortal.class, CraftEndPortal::new);
+        register(BlockEntityType.FURNACE, CraftFurnaceFurnace.class, CraftFurnaceFurnace::new);
+        register(BlockEntityType.HOPPER, CraftHopper.class, CraftHopper::new);
+        register(BlockEntityType.JIGSAW, CraftJigsaw.class, CraftJigsaw::new);
+        register(BlockEntityType.JUKEBOX, CraftJukebox.class, CraftJukebox::new);
+        register(BlockEntityType.LECTERN, CraftLectern.class, CraftLectern::new);
+        register(BlockEntityType.PISTON, CraftMovingPiston.class, CraftMovingPiston::new);
+        register(BlockEntityType.SCULK_SENSOR, CraftSculkSensor.class, CraftSculkSensor::new);
+        register(BlockEntityType.SMOKER, CraftSmoker.class, CraftSmoker::new);
+        register(BlockEntityType.MOB_SPAWNER, CraftCreatureSpawner.class, CraftCreatureSpawner::new);
+        register(BlockEntityType.STRUCTURE_BLOCK, CraftStructureBlock.class, CraftStructureBlock::new);
+        // Paper end
     }
 
     private static void register(Material blockType, BlockStateFactory<?> factory) {
@@ -290,35 +162,45 @@ public final class CraftBlockStates {
     }
 
     private static <T extends BlockEntity, B extends CraftBlockEntityState<T>> void register(
-            Material blockType,
+            net.minecraft.world.level.block.entity.BlockEntityType<? extends T> blockEntityType, // Paper
             Class<B> blockStateType,
-            BiFunction<World, T, B> blockStateConstructor,
-            BiFunction<BlockPos, net.minecraft.world.level.block.state.BlockState, T> tileEntityConstructor
+            BiFunction<World, T, B> blockStateConstructor // Paper
     ) {
-        CraftBlockStates.register(Collections.singletonList(blockType), blockStateType, blockStateConstructor, tileEntityConstructor);
-    }
-
-    private static <T extends BlockEntity, B extends CraftBlockEntityState<T>> void register(
-            List<Material> blockTypes,
-            Class<B> blockStateType,
-            BiFunction<World, T, B> blockStateConstructor,
-            BiFunction<BlockPos, net.minecraft.world.level.block.state.BlockState, T> tileEntityConstructor
-    ) {
-        BlockStateFactory<B> factory = new BlockEntityStateFactory<>(blockStateType, blockStateConstructor, tileEntityConstructor);
-        for (Material blockType : blockTypes) {
-            CraftBlockStates.register(blockType, factory);
+        // Paper start
+        BlockStateFactory<B> factory = new BlockEntityStateFactory<>(blockStateType, blockStateConstructor, blockEntityType::create);
+        for (net.minecraft.world.level.block.Block block : blockEntityType.validBlocks) {
+            CraftBlockStates.register(CraftMagicNumbers.getMaterial(block), factory);
         }
+        CraftBlockStates.register(blockEntityType, factory);
+        // Paper end
     }
 
     private static BlockStateFactory<?> getFactory(Material material) {
         return CraftBlockStates.FACTORIES.getOrDefault(material, DEFAULT_FACTORY);
     }
 
+    // Paper start
+    private static BlockStateFactory<?> getFactory(Material material, BlockEntityType<?> type) {
+        if (type != null) {
+            return CraftBlockStates.FACTORIES_BY_BLOCK_ENTITY_TYPE.getOrDefault(type, getFactory(material));
+        } else {
+            return getFactory(material);
+        }
+    }
+    // Paper end
+
     public static Class<? extends CraftBlockState> getBlockStateType(Material material) {
         Preconditions.checkNotNull(material, "material is null");
         return CraftBlockStates.getFactory(material).blockStateType;
     }
 
+    // Paper start
+    public static Class<? extends CraftBlockState> getBlockStateType(BlockEntityType<?> blockEntityType) {
+        Preconditions.checkNotNull(blockEntityType, "blockEntityType is null");
+        return CraftBlockStates.getFactory(null, blockEntityType).blockStateType;
+    }
+    // Paper end
+
     public static BlockState getBlockState(Block block) {
         Preconditions.checkNotNull(block, "block is null");
         CraftBlock craftBlock = (CraftBlock) block;
@@ -361,7 +243,7 @@ public final class CraftBlockStates {
         if (world != null && tileEntity == null && CraftBlockStates.isTileEntityOptional(material)) {
             factory = CraftBlockStates.DEFAULT_FACTORY;
         } else {
-            factory = CraftBlockStates.getFactory(material);
+            factory = CraftBlockStates.getFactory(material, tileEntity != null ? tileEntity.getType() : null); // Paper
         }
         return factory.createBlockState(world, blockPosition, blockData, tileEntity);
     }
diff --git a/src/test/java/org/bukkit/craftbukkit/block/BlockStateTest.java b/src/test/java/org/bukkit/craftbukkit/block/BlockStateTest.java
index 738227d8dbab8460d2bd7f75098e91bcae2d1ff3..8980163dabdd21d040bc7e622e9a22d01f73005b 100644
--- a/src/test/java/org/bukkit/craftbukkit/block/BlockStateTest.java
+++ b/src/test/java/org/bukkit/craftbukkit/block/BlockStateTest.java
@@ -26,4 +26,11 @@ public class BlockStateTest extends AbstractTestingBase {
             }
         }
     }
+
+    @Test
+    public void testBlockEntityTypes() {
+        for (var blockEntityType : Registry.BLOCK_ENTITY_TYPE) {
+            org.junit.Assert.assertNotNull(CraftBlockStates.getBlockStateType(blockEntityType));
+        }
+    }
 }