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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.
66 lines
3.2 KiB
Diff
66 lines
3.2 KiB
Diff
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: Mariell Hoversholm <proximyst@proximyst.com>
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Date: Thu, 30 Apr 2020 16:56:54 +0200
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Subject: [PATCH] Add Raw Byte ItemStack Serialization
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Serializes using NBT which is safer for server data migrations than bukkits format.
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diff --git a/src/main/java/org/bukkit/craftbukkit/util/CraftMagicNumbers.java b/src/main/java/org/bukkit/craftbukkit/util/CraftMagicNumbers.java
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index d08b01fef9928f2239c8663cf90219dc7acad58c..af706146a26ede6b9f5a39c8deb490ff25334ae6 100644
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--- a/src/main/java/org/bukkit/craftbukkit/util/CraftMagicNumbers.java
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+++ b/src/main/java/org/bukkit/craftbukkit/util/CraftMagicNumbers.java
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@@ -458,6 +458,53 @@ public final class CraftMagicNumbers implements UnsafeValues {
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public com.destroystokyo.paper.util.VersionFetcher getVersionFetcher() {
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return new com.destroystokyo.paper.PaperVersionFetcher();
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}
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+
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+ @Override
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+ public byte[] serializeItem(ItemStack item) {
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+ Preconditions.checkNotNull(item, "null cannot be serialized");
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+ Preconditions.checkArgument(item.getType() != Material.AIR, "air cannot be serialized");
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+
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+ return serializeNbtToBytes((net.minecraft.nbt.CompoundTag) (item instanceof CraftItemStack ? ((CraftItemStack) item).handle : CraftItemStack.asNMSCopy(item)).save(MinecraftServer.getServer().registryAccess()));
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+ }
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+
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+ @Override
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+ public ItemStack deserializeItem(byte[] data) {
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+ Preconditions.checkNotNull(data, "null cannot be deserialized");
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+ Preconditions.checkArgument(data.length > 0, "cannot deserialize nothing");
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+
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+ net.minecraft.nbt.CompoundTag compound = deserializeNbtFromBytes(data);
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+ final int dataVersion = compound.getInt("DataVersion");
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+ compound = (net.minecraft.nbt.CompoundTag) MinecraftServer.getServer().fixerUpper.update(References.ITEM_STACK, new Dynamic<>(NbtOps.INSTANCE, compound), dataVersion, this.getDataVersion()).getValue();
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+ return CraftItemStack.asCraftMirror(net.minecraft.world.item.ItemStack.parse(MinecraftServer.getServer().registryAccess(), compound).orElseThrow());
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+ }
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+
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+ private byte[] serializeNbtToBytes(CompoundTag compound) {
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+ compound.putInt("DataVersion", getDataVersion());
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+ java.io.ByteArrayOutputStream outputStream = new java.io.ByteArrayOutputStream();
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+ try {
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+ net.minecraft.nbt.NbtIo.writeCompressed(
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+ compound,
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+ outputStream
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+ );
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+ } catch (IOException ex) {
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+ throw new RuntimeException(ex);
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+ }
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+ return outputStream.toByteArray();
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+ }
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+
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+ private net.minecraft.nbt.CompoundTag deserializeNbtFromBytes(byte[] data) {
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+ net.minecraft.nbt.CompoundTag compound;
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+ try {
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+ compound = net.minecraft.nbt.NbtIo.readCompressed(
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+ new java.io.ByteArrayInputStream(data), net.minecraft.nbt.NbtAccounter.unlimitedHeap()
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+ );
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+ } catch (IOException ex) {
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+ throw new RuntimeException(ex);
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+ }
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+ int dataVersion = compound.getInt("DataVersion");
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+ Preconditions.checkArgument(dataVersion <= getDataVersion(), "Newer version! Server downgrades are not supported!");
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+ return compound;
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+ }
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// Paper end
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@Override
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