fix: enforce all config tasks to be on main

Thanks Mojang
Related to RelativityMC/VMP-fabric#105

Author: ishland

c2me-base/src/main/java/com/ishland/c2me/base/mixin/bugfixes/config_enforce_main/MixinServerConfigurationNetworkHandler.java

@@ -0,0 +1,35 @@
+package com.ishland.c2me.base.mixin.bugfixes.config_enforce_main;
+
+import net.minecraft.network.ClientConnection;
+import net.minecraft.network.NetworkThreadUtils;
+import net.minecraft.network.listener.ServerConfigurationPacketListener;
+import net.minecraft.network.listener.TickablePacketListener;
+import net.minecraft.network.packet.c2s.common.ResourcePackStatusC2SPacket;
+import net.minecraft.network.packet.c2s.config.AcceptCodeOfConductC2SPacket;
+import net.minecraft.server.MinecraftServer;
+import net.minecraft.server.network.ConnectedClientData;
+import net.minecraft.server.network.ServerCommonNetworkHandler;
+import net.minecraft.server.network.ServerConfigurationNetworkHandler;
+import org.spongepowered.asm.mixin.Mixin;
+import org.spongepowered.asm.mixin.injection.At;
+import org.spongepowered.asm.mixin.injection.Inject;
+import org.spongepowered.asm.mixin.injection.callback.CallbackInfo;
+
+@Mixin(ServerConfigurationNetworkHandler.class)
+public abstract class MixinServerConfigurationNetworkHandler extends ServerCommonNetworkHandler implements ServerConfigurationPacketListener, TickablePacketListener {
+
+    public MixinServerConfigurationNetworkHandler(MinecraftServer server, ClientConnection connection, ConnectedClientData clientData) {
+        super(server, connection, clientData);
+    }
+
+    @Inject(method = "onResourcePackStatus", at = @At("HEAD"))
+    private void onResourcePackStatus(ResourcePackStatusC2SPacket packet, CallbackInfo ci) {
+        NetworkThreadUtils.forceMainThread(packet, this, this.server.getPacketApplyBatcher());
+    }
+
+    @Inject(method = "onAcceptCodeOfConduct", at = @At("HEAD"))
+    private void onAcceptCodeOfConduct(AcceptCodeOfConductC2SPacket packet, CallbackInfo ci) {
+        NetworkThreadUtils.forceMainThread(packet, this, this.server.getPacketApplyBatcher());
+    }
+
+}

c2me-base/src/main/java/com/ishland/c2me/base/mixin/bugfixes/package-info.java

@@ -0,0 +1 @@
+package com.ishland.c2me.base.mixin.bugfixes;

c2me-base/src/main/resources/c2me-base.mixins.json

@@ -56,6 +56,7 @@
     "access.IXoroshiro128PlusPlusRandomDeriver",
     "access.IXoroshiro128PlusPlusRandomImpl",
     "access.fapi.IArrayBackedEvent",
+    "bugfixes.config_enforce_main.MixinServerConfigurationNetworkHandler",
     "client_movement.MixinPlayerEntity",
     "instrumentation.MixinServerChunkManager",
     "report.MixinDedicatedServerWatchdog",