Added packet buffering and fix crash when placing flowers on leaves

- Packets are now buffered before processing to reduce stack depth
- Attempts to place tiles on invalid locations get rejected earlier

src/main/java/ru/windcorp/progressia/client/graphics/world/LayerWorld.java

@@ -76,6 +76,8 @@ public class LayerWorld extends Layer {
 
 	@Override
 	protected void doRender() {
+		client.getComms().processPackets();
+		
 		Camera camera = client.getCamera();
 		if (camera.hasAnchor()) {
 			renderWorld();

src/main/java/ru/windcorp/progressia/common/comms/CommsChannel.java

@@ -22,6 +22,7 @@ import java.io.IOException;
 import java.util.ArrayList;
 import java.util.Collection;
 import java.util.Collections;
+import java.util.List;
 
 import ru.windcorp.progressia.common.comms.packets.Packet;
 
@@ -54,6 +55,8 @@ public abstract class CommsChannel {
 
 	private final Collection<CommsListener> listeners = Collections.synchronizedCollection(new ArrayList<>());
 	
+	private final List<Packet> pendingPackets = Collections.synchronizedList(new ArrayList<>());
+
 	protected abstract void doSendPacket(Packet packet) throws IOException;
 
 	private synchronized void sendPacket(
@@ -101,9 +104,20 @@ public abstract class CommsChannel {
 	public abstract void disconnect();
 
 	protected void onPacketReceived(Packet packet) {
+		pendingPackets.add(packet);
+	}
+
+	protected void forwardPacketToListeners(Packet packet) {
 		listeners.forEach(l -> l.onPacketReceived(packet));
 	}
 	
+	public void processPackets() {
+		synchronized (pendingPackets) {
+			pendingPackets.forEach(this::forwardPacketToListeners);
+			pendingPackets.clear();
+		}
+	}
+
 	public void addListener(CommsListener listener) {
 		listeners.add(listener);
 	}

src/main/java/ru/windcorp/progressia/server/Server.java

@@ -91,6 +91,7 @@ public class Server {
 		this.playerManager = new PlayerManager(this);
 		this.loadManager = new LoadManager(this);
 
+		schedule(getClientManager()::processPackets);
 		schedule(new ChunkRequestDaemon(loadManager.getChunkManager())::tick);
 		schedule(new EntityRequestDaemon(loadManager.getEntityManager())::tick);
 

src/main/java/ru/windcorp/progressia/server/comms/ClientManager.java

@@ -26,6 +26,7 @@ import glm.vec._3.i.Vec3i;
 import gnu.trove.TCollections;
 import gnu.trove.map.TIntObjectMap;
 import gnu.trove.map.hash.TIntObjectHashMap;
+import ru.windcorp.progressia.common.comms.CommsChannel;
 import ru.windcorp.progressia.common.comms.CommsChannel.State;
 import ru.windcorp.progressia.common.comms.packets.Packet;
 import ru.windcorp.progressia.common.world.PacketSetGravityModel;
@@ -93,6 +94,10 @@ public class ClientManager {
 		clientsById.remove(client.getId());
 	}
 	
+	public void processPackets() {
+		getClients().forEach(CommsChannel::processPackets);
+	}
+
 	/**
 	 * Sends the provided packet to all connected player clients.
 	 * 

src/main/java/ru/windcorp/progressia/test/TestContent.java

@@ -55,6 +55,9 @@ import ru.windcorp.progressia.common.world.tile.*;
 import ru.windcorp.progressia.server.Server;
 import ru.windcorp.progressia.server.comms.controls.*;
 import ru.windcorp.progressia.server.world.block.*;
+import ru.windcorp.progressia.server.world.context.ServerBlockContext;
+import ru.windcorp.progressia.server.world.context.ServerTileContext;
+import ru.windcorp.progressia.server.world.context.ServerTileStackContext;
 import ru.windcorp.progressia.server.world.entity.*;
 import ru.windcorp.progressia.server.world.generation.planet.PlanetGravityModel;
 import ru.windcorp.progressia.server.world.tile.*;
@@ -486,11 +489,22 @@ public class TestContent {
 		Vec3i blockInWorld = controlData.getBlockInWorld();
 		AbsFace face = controlData.getFace();
 
-		if (server.getWorld().getData().getChunkByBlock(blockInWorld) == null)
+		if (server.getWorld().getData().getChunkByBlock(blockInWorld) == null) {
 			return;
-		if (server.getWorld().getData().getTiles(blockInWorld, face).isFull())
+		}
+		if (server.getWorld().getData().getTiles(blockInWorld, face).isFull()) {
 			return;
-		server.createAbsoluteContext().addTile(blockInWorld, face.relativize(AbsFace.POS_Z), tile);
+		}
+		
+		ServerBlockContext context = server.createContext(blockInWorld);
+		ServerTileStackContext tsContext = context.push(context.toContext(face));
+		ServerTileContext tileContext = tsContext.push(tsContext.getTileCount());
+		
+		TileLogic logic = TileLogicRegistry.getInstance().get(tile.getId());
+		if (!logic.canOccupyFace(tileContext)) {
+			return;
+		}
+		tileContext.addTile(tile);
 	}
 
 	private static void registerMisc() {