Make client net handling run on main thread

src/main/java/carpet/mixins/ClientPacketListener_customPacketsMixin.java

@@ -7,6 +7,7 @@ import net.minecraft.client.multiplayer.ClientPacketListener;
 import net.minecraft.network.chat.Component;
 import net.minecraft.network.protocol.game.ClientboundCustomPayloadPacket;
 import net.minecraft.network.protocol.game.ClientboundLoginPacket;
+import org.spongepowered.asm.mixin.Final;
 import org.spongepowered.asm.mixin.Mixin;
 import org.spongepowered.asm.mixin.Shadow;
 import org.spongepowered.asm.mixin.injection.At;
@@ -16,9 +17,9 @@ import org.spongepowered.asm.mixin.injection.callback.CallbackInfo;
 @Mixin(ClientPacketListener.class)
 public abstract class ClientPacketListener_customPacketsMixin
 {
-    @Shadow private Minecraft minecraft;
+    @Final @Shadow private Minecraft minecraft;
 
-    @Inject(method = "handleCustomPayload", at = @At("HEAD"), cancellable = true)
+    @Inject(method = "handleCustomPayload", at = @At(value = "INVOKE", target = "Lnet/minecraft/network/protocol/game/ClientboundCustomPayloadPacket;getIdentifier()Lnet/minecraft/resources/ResourceLocation;"), cancellable = true)
     private void onOnCustomPayload(ClientboundCustomPayloadPacket packet, CallbackInfo ci)
     {
         if (CarpetClient.CARPET_CHANNEL.equals(packet.getIdentifier()))
@@ -39,5 +40,4 @@ public abstract class ClientPacketListener_customPacketsMixin
     {
         CarpetClient.disconnect();
     }
-
 }

src/main/java/carpet/network/CarpetClient.java

@@ -12,7 +12,6 @@ import net.minecraft.resources.ResourceLocation;
 
 public class CarpetClient
 {
-    public static final Object sync = new Object();
     public static final int HI = 69;
     public static final int HELLO = 420;
     public static final int DATA = 1;
@@ -24,15 +23,8 @@ public class CarpetClient
     public static final ResourceLocation CARPET_CHANNEL = new ResourceLocation("carpet:hello");
 
     public static void gameJoined(LocalPlayer player)
-    {
-        synchronized (sync)
     {
         clientPlayer = player;
-            // client didn't say hi back yet
-            if (isServerCarpet)
-                ClientNetworkHandler.respondHello();
-
-        }
     }
 
     public static void disconnect()

src/main/java/carpet/network/ClientNetworkHandler.java

@@ -87,6 +87,7 @@ public class ClientNetworkHandler
         });
     };
 
+    // Ran on the Main Minecraft Thread
     public static void handleData(FriendlyByteBuf data, LocalPlayer player)
     {
         if (data != null)
@@ -100,8 +101,6 @@ public class ClientNetworkHandler
     }
 
     private static void onHi(FriendlyByteBuf data)
-    {
-        synchronized (CarpetClient.sync)
     {
         CarpetClient.setCarpet();
         CarpetClient.serverCarpetVersion = data.readUtf(64);
@@ -113,10 +112,9 @@ public class ClientNetworkHandler
         {
             CarpetSettings.LOG.warn("Joined carpet server with another carpet version: "+CarpetClient.serverCarpetVersion);
         }
-            if (CarpetClient.getPlayer() != null)
+        // We can ensure that this packet is
+        // processed AFTER the player has joined
         respondHello();
-
-        }
     }
 
     public static void respondHello()

src/main/java/carpet/script/utils/ShapesRenderer.java

@@ -113,7 +113,7 @@ public class ShapesRenderer
         double cameraZ = camera.getPosition().z;
         boolean entityBoxes = client.getEntityRenderDispatcher().shouldRenderHitBoxes();
 
-        if (shapes.size() != 0) { synchronized (shapes) {
+        if (shapes.size() != 0) {
             shapes.get(dimensionType).long2ObjectEntrySet().removeIf(
                     entry -> entry.getValue().isExpired(currentTime)
             );
@@ -136,16 +136,15 @@ public class ShapesRenderer
             matrixStack.popPose();
             RenderSystem.applyModelViewMatrix();
 
-        }}
-        if (labels.size() != 0) { synchronized (labels)
-        {
+        }
+        if (labels.size() != 0) {
             labels.get(dimensionType).long2ObjectEntrySet().removeIf(
                     entry -> entry.getValue().isExpired(currentTime)
             );
             labels.get(dimensionType).values().forEach(s -> {
                 if ( (!s.shape.debug || entityBoxes) && s.shouldRender(dimensionType)) s.renderLines(matrices, tessellator, bufferBuilder, cameraX, cameraY, cameraZ, partialTick);
             });
-        }}
+        }
         RenderSystem.enableCull();
         RenderSystem.depthMask(true);
         RenderSystem.enableBlend();
@@ -181,8 +180,6 @@ public class ShapesRenderer
             long key = rshape.key();
             Map<ResourceKey<Level>, Long2ObjectOpenHashMap<RenderedShape<? extends ShapeDispatcher.ExpiringShape>>> container =
                     rshape.stageDeux()?labels:shapes;
-            synchronized (container)
-            {
             RenderedShape<?> existing = container.computeIfAbsent(dim, d -> new Long2ObjectOpenHashMap<>()).get(key);
             if (existing != null)
             {   // promoting previous shape
@@ -192,32 +189,21 @@ public class ShapesRenderer
             {
                 container.get(dim).put(key, rshape);
             }
-            }
+
         }
     }
     public void reset()
-    {
-        synchronized (shapes)
     {
         shapes.values().forEach(Long2ObjectOpenHashMap::clear);
-        }
-        synchronized (labels)
-        {
         labels.values().forEach(Long2ObjectOpenHashMap::clear);
     }
-    }
 
     public void renewShapes()
     {
         CarpetProfiler.ProfilerToken token = CarpetProfiler.start_section(null, "Scarpet client", CarpetProfiler.TYPE.GENERAL);
-        synchronized (shapes)
-        {
         shapes.values().forEach(el -> el.values().forEach(shape -> shape.expiryTick++));
-        }
-        synchronized (labels)
-        {
         labels.values().forEach(el -> el.values().forEach(shape -> shape.expiryTick++));
-        }
+
         CarpetProfiler.end_current_section(token);
     }