Add patch for Netty packet leak

Fixes https://github.com/embeddedt/ModernFix/issues/15
Related:
https://github.com/EnigmaticaModpacks/Enigmatica6/issues/4469
https://github.com/MinecraftForge/MinecraftForge/pull/8181
https://github.com/MinecraftForge/MinecraftForge/pull/8042

src/main/java/org/embeddedt/modernfix/core/config/ModernFixEarlyConfig.java

@@ -29,6 +29,7 @@ public class ModernFixEarlyConfig {
         this.addMixinRule("perf.trim_model_caches", true);
         this.addMixinRule("bugfix.concurrency", true);
         this.addMixinRule("bugfix.edge_chunk_not_saved", true);
+        this.addMixinRule("bugfix.packet_leak", false);
         this.addMixinRule("perf.async_jei", true);
         this.addMixinRule("perf.thread_priorities", true);
         this.addMixinRule("perf.preload_block_classes", false);

src/main/java/org/embeddedt/modernfix/duck/IClientNetHandler.java

@@ -0,0 +1,7 @@
+package org.embeddedt.modernfix.duck;
+
+import net.minecraft.network.PacketBuffer;
+
+public interface IClientNetHandler {
+    PacketBuffer getCopiedCustomBuffer();
+}

src/main/java/org/embeddedt/modernfix/mixin/bugfix/packet_leak/ClientPlayNetHandlerMixin.java

@@ -0,0 +1,31 @@
+package org.embeddedt.modernfix.mixin.bugfix.packet_leak;
+
+import net.minecraft.client.network.play.ClientPlayNetHandler;
+import net.minecraft.network.PacketBuffer;
+import net.minecraft.network.play.server.SCustomPayloadPlayPacket;
+import org.embeddedt.modernfix.duck.IClientNetHandler;
+import org.spongepowered.asm.mixin.Mixin;
+import org.spongepowered.asm.mixin.injection.At;
+import org.spongepowered.asm.mixin.injection.Redirect;
+
+@Mixin(ClientPlayNetHandler.class)
+public class ClientPlayNetHandlerMixin implements IClientNetHandler {
+    private PacketBuffer savedCopy = null;
+    /**
+     * @author embeddedt
+     * @reason Release the packet buffer at the end. Needed in f
+     */
+    @Redirect(method = "handleCustomPayload", at = @At(value = "INVOKE", target = "Lnet/minecraft/network/play/server/SCustomPayloadPlayPacket;getData()Lnet/minecraft/network/PacketBuffer;"))
+    private PacketBuffer saveCopyForRelease(SCustomPayloadPlayPacket instance) {
+        PacketBuffer copy = instance.getData();
+        savedCopy = copy;
+        return copy;
+    }
+
+    @Override
+    public PacketBuffer getCopiedCustomBuffer() {
+        PacketBuffer copy = savedCopy;
+        savedCopy = null;
+        return copy;
+    }
+}

src/main/java/org/embeddedt/modernfix/mixin/bugfix/packet_leak/SCustomPayloadPlayPacketMixin.java

@@ -0,0 +1,43 @@
+package org.embeddedt.modernfix.mixin.bugfix.packet_leak;
+
+import net.minecraft.client.network.play.IClientPlayNetHandler;
+import net.minecraft.network.PacketBuffer;
+import net.minecraft.network.play.server.SCustomPayloadPlayPacket;
+import net.minecraft.util.ResourceLocation;
+import org.embeddedt.modernfix.duck.IClientNetHandler;
+import org.spongepowered.asm.mixin.Mixin;
+import org.spongepowered.asm.mixin.Shadow;
+import org.spongepowered.asm.mixin.injection.At;
+import org.spongepowered.asm.mixin.injection.Inject;
+import org.spongepowered.asm.mixin.injection.Redirect;
+import org.spongepowered.asm.mixin.injection.callback.CallbackInfo;
+
+@Mixin(SCustomPayloadPlayPacket.class)
+public class SCustomPayloadPlayPacketMixin {
+    @Shadow private PacketBuffer data;
+
+    private boolean needsRelease;
+
+    @Inject(method = "<init>(Lnet/minecraft/util/ResourceLocation;Lnet/minecraft/network/PacketBuffer;)V", at = @At("RETURN"))
+    private void markNotOwned(ResourceLocation pIdentifier, PacketBuffer pData, CallbackInfo ci) {
+        this.needsRelease = false;
+    }
+
+    @Inject(method = "read", at = @At("RETURN"))
+    private void markOwned(PacketBuffer p_148837_1_, CallbackInfo ci) {
+        this.needsRelease = true;
+    }
+
+    @Redirect(method = "handle(Lnet/minecraft/client/network/play/IClientPlayNetHandler;)V", at = @At(value = "INVOKE", target = "Lnet/minecraft/client/network/play/IClientPlayNetHandler;handleCustomPayload(Lnet/minecraft/network/play/server/SCustomPayloadPlayPacket;)V"))
+    private void handleAndFree(IClientPlayNetHandler instance, SCustomPayloadPlayPacket sCustomPayloadPlayPacket) {
+        try {
+            instance.handleCustomPayload(sCustomPayloadPlayPacket);
+        } finally {
+            PacketBuffer copied = ((IClientNetHandler)instance).getCopiedCustomBuffer();
+            if(copied != null)
+                copied.release();
+        }
+        if(this.needsRelease)
+            this.data.release();
+    }
+}

src/main/resources/modernfix.mixins.json

@@ -54,7 +54,9 @@
     "perf.blast_search_trees.IngredientFilterInvoker",
     "perf.faster_baking.ModelBakeryMixin",
     "perf.cache_model_materials.VanillaModelMixin",
-    "perf.cache_model_materials.MultipartMixin"
+    "perf.cache_model_materials.MultipartMixin",
+    "bugfix.packet_leak.ClientPlayNetHandlerMixin",
+    "bugfix.packet_leak.SCustomPayloadPlayPacketMixin"
   ],
   "injectors": {
     "defaultRequire": 1