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Merge pull request #205 from Matsv/master

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Fix commandblocks not able to change command on update
This commit is contained in:
Myles 2016-03-13 12:26:40 +00:00
commit 9954195a8f
3 changed files with 55 additions and 22 deletions
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56
src/main/java/us/myles/ViaVersion/listeners/CommandBlockListener.java
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@ -1,6 +1,7 @@
package us.myles.ViaVersion.listeners;
import io.netty.buffer.ByteBuf;
import io.netty.buffer.ByteBufOutputStream;
import io.netty.buffer.Unpooled;
import lombok.RequiredArgsConstructor;
import org.bukkit.block.Block;
@ -12,12 +13,15 @@ import org.bukkit.event.Listener;
import org.bukkit.event.block.Action;
import org.bukkit.event.player.PlayerInteractEvent;
import org.bukkit.event.player.PlayerJoinEvent;
import org.spacehq.opennbt.tag.builtin.ByteTag;
import org.spacehq.opennbt.tag.builtin.CompoundTag;
import us.myles.ViaVersion.ViaVersionPlugin;
import us.myles.ViaVersion.packets.PacketType;
import us.myles.ViaVersion.util.PacketUtil;
import us.myles.ViaVersion.util.ReflectionUtil;
import java.lang.reflect.InvocationTargetException;
import java.io.DataOutput;
import java.io.DataOutputStream;
import java.lang.reflect.Method;
@RequiredArgsConstructor
@ -41,22 +45,58 @@ public class CommandBlockListener implements Listener {
if (e.getAction() == Action.RIGHT_CLICK_BLOCK && plugin.isPorted(e.getPlayer()) && e.getPlayer().isOp()) {
try {
sendCommandBlockPacket(e.getClickedBlock(), e.getPlayer());
} catch (NoSuchFieldException | IllegalAccessException | InvocationTargetException | NoSuchMethodException | ClassNotFoundException e1) {
e1.printStackTrace();
} catch (Exception ex) {
ex.printStackTrace();
}
}
}
private void sendCommandBlockPacket(Block b, Player player) throws NoSuchFieldException, IllegalAccessException, NoSuchMethodException, InvocationTargetException, ClassNotFoundException {
private void sendCommandBlockPacket(Block b, Player player) throws Exception {
if (!(b.getState() instanceof CommandBlock))
return;
CommandBlock cmd = (CommandBlock) b.getState();
Object tileEntityCommand = ReflectionUtil.get(cmd, "commandBlock", ReflectionUtil.nms("TileEntityCommand"));
Object updatePacket = ReflectionUtil.invoke(tileEntityCommand, "getUpdatePacket");
Object nmsPlayer = ReflectionUtil.invoke(player, "getHandle");
Object playerConnection = ReflectionUtil.get(nmsPlayer, "playerConnection", ReflectionUtil.nms("PlayerConnection"));
Method sendPacket = playerConnection.getClass().getMethod("sendPacket", ReflectionUtil.nms("Packet"));
sendPacket.invoke(playerConnection, updatePacket); //Let the transformer do the work
ByteBuf buf = packetToByteBuf(updatePacket);
plugin.sendRawPacket(player, buf);
}
private ByteBuf packetToByteBuf(Object updatePacket) throws Exception {
ByteBuf buf = Unpooled.buffer();
PacketUtil.writeVarInt(PacketType.PLAY_UPDATE_BLOCK_ENTITY.getNewPacketID(), buf); //Packet ID
long[] pos = getPosition(ReflectionUtil.get(updatePacket, "a", ReflectionUtil.nms("BlockPosition")));
PacketUtil.writeBlockPosition(buf, pos[0], pos[1], pos[2]); //Block position
buf.writeByte(2); //Action id always 2
CompoundTag nbt = getNBT(ReflectionUtil.get(updatePacket, "c", ReflectionUtil.nms("NBTTagCompound")));
if (nbt == null) {
buf.writeByte(0); //If nbt is null. Use 0 as nbt
return buf;
}
nbt.put(new ByteTag("powered", (byte) 0));
nbt.put(new ByteTag("auto", (byte) 0));
nbt.put(new ByteTag("conditionMet", (byte) 0));
PacketUtil.writeNBT(buf, nbt); //NBT tag
return buf;
}
private long[] getPosition(Object obj) throws ClassNotFoundException, NoSuchFieldException, IllegalAccessException {
return new long[]{
(long) ReflectionUtil.getSuper(obj, "a", int.class), //X
(long) ReflectionUtil.getSuper(obj, "c", int.class), //Y
(long) ReflectionUtil.getSuper(obj, "d", int.class) //Z
};
}
private CompoundTag getNBT(Object obj) throws Exception {
ByteBuf buf = Unpooled.buffer();
Method m = ReflectionUtil.nms("NBTCompressedStreamTools").getMethod("a", ReflectionUtil.nms("NBTTagCompound"), DataOutput.class);
m.invoke(null, obj, new DataOutputStream(new ByteBufOutputStream(buf)));
try {
return PacketUtil.readNBT(buf);
} finally {
buf.release();
}
}
}

15
src/main/java/us/myles/ViaVersion/transformers/OutgoingTransformer.java
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@ -759,20 +759,7 @@ public class OutgoingTransformer {
return;
}
if (action == 2) { //Update commandblock
try {
CompoundTag nbt = readNBT(input);
if (nbt == null)
throw new CancelException();
//Thanks http://www.minecraftforum.net/forums/minecraft-discussion/redstone-discussion-and/command-blocks/2488148-1-9-nbt-changes-and-additions#TileAllCommandBlocks
nbt.put(new ByteTag("powered", (byte) 0));
nbt.put(new ByteTag("auto", (byte) 0));
nbt.put(new ByteTag("conditionMet", (byte) 0));
writeNBT(output, nbt);
return;
} catch (IOException e) {
e.printStackTrace();
throw new CancelException();
}
throw new CancelException(); //Only update if player interact with commandblock (The commandblock window will update every time this packet is sent, this would prevent you from change things that update every tick)
}
output.writeBytes(input, input.readableBytes());
return;

6
src/main/java/us/myles/ViaVersion/util/ReflectionUtil.java
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@ -37,6 +37,12 @@ public class ReflectionUtil {
return (T) field.get(null);
}
public static <T> T getSuper(Object o, String f, Class<T> t) throws NoSuchFieldException, IllegalAccessException {
Field field = o.getClass().getSuperclass().getDeclaredField(f);
field.setAccessible(true);
return (T) field.get(o);
}
public static <T> T get(Object instance, Class<?> clazz, String f, Class<T> t) throws NoSuchFieldException, IllegalAccessException {
Field field = clazz.getDeclaredField(f);
field.setAccessible(true);