Lophine/lophine-server/minecraft-patches/features/0051-Add-Portal-rate-limiter.patch

From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Bacteriawa <A3167717663@hotmail.com>
Date: Tue, 21 Apr 2026 02:27:38 +0800
Subject: [PATCH] Add Portal rate limiter


diff --git a/io/papermc/paper/threadedregions/RegionizedWorldData.java b/io/papermc/paper/threadedregions/RegionizedWorldData.java
index 981458f6697a79dbc9fc8cf41c088c98e556c6dd..4dbbe03d949811bf6140a35faa5e8cee8f7e28f0 100644
--- a/io/papermc/paper/threadedregions/RegionizedWorldData.java
+++ b/io/papermc/paper/threadedregions/RegionizedWorldData.java
@@ -154,6 +154,10 @@ public final class RegionizedWorldData {
             for (final ChunkHolder chunkHolder : from.chunkHoldersToBroadcast) {
                 into.chunkHoldersToBroadcast.add(chunkHolder);
             }
+            // Luminol start - Portal rate limiter
+            into.portalRateThrottler.mergeWith(from.portalRateThrottler);
+            from.portalRateThrottler.destroy();
+            // Luminol end
         }
 
         @Override
@@ -316,6 +320,12 @@ public final class RegionizedWorldData {
                     into.chunkHoldersToBroadcast.add(chunkHolder);
                 }
             }
+            // Luminol start - Portal rate limiter
+            for (var worldData : dataSet) {
+                from.portalRateThrottler.splitInto(worldData.portalRateThrottler);
+            }
+            from.portalRateThrottler.destroy();
+            // Luminol end
         }
     };
 
@@ -338,6 +348,35 @@ public final class RegionizedWorldData {
         return this.isHandlingTick;
     }
 
+    // Luminol start - Portal rate limiter
+    public final me.earthme.luminol.utils.RateThrottler portalRateThrottler = new me.earthme.luminol.utils.RateThrottler();
+    public final net.objecthunter.exp4j.Expression portalRateCapExpression = me.earthme.luminol.config.modules.function.PortalRateLimiterConfig.getExpressionIfConfigured();
+
+    private int computePortalRateCap() {
+        // expression mode is disabled
+        if (this.portalRateCapExpression == null) {
+            return me.earthme.luminol.config.modules.function.PortalRateLimiterConfig.maxPortalTeleportsPerTick;
+        }
+
+        final int tickingEntityCount = this.entityTickList.size();
+        final int tickingChunkCount = this.tickingChunks.size();
+        final int playerCount = this.localPlayers.size();
+
+        return me.earthme.luminol.config.modules.function.PortalRateLimiterConfig.computeExpression(
+                this.portalRateCapExpression,
+                tickingEntityCount,
+                tickingChunkCount,
+                playerCount
+        );
+    }
+    public boolean isPortalTeleportationOutOfRate() {
+        if (!me.earthme.luminol.config.modules.function.PortalRateLimiterConfig.enabled) {
+            return false;
+        }
+
+        return this.portalRateThrottler.isOutOfRate(this.computePortalRateCap());
+    }
+    // Luminol end
     // entities
     // this is copy on write to allow packet processing to iterate safely
     private final CopyOnWriteArrayList<ServerPlayer> localPlayers = new CopyOnWriteArrayList<>();
diff --git a/net/minecraft/server/MinecraftServer.java b/net/minecraft/server/MinecraftServer.java
index ff6809944c2dd8a2cc7c11a8b05b0f7c17b5fb4c..fe1b70edb24e2ded42f8ca1f5ddfbae7151b147a 100644
--- a/net/minecraft/server/MinecraftServer.java
+++ b/net/minecraft/server/MinecraftServer.java
@@ -1978,6 +1978,9 @@ public abstract class MinecraftServer extends ReentrantBlockableEventLoop<TickTa
             //net.minecraft.world.level.block.entity.HopperBlockEntity.skipHopperEvents = level.paperConfig().hopper.disableMoveEvent || org.bukkit.event.inventory.InventoryMoveItemEvent.getHandlerList().getRegisteredListeners().length == 0; // Paper - Perf: Optimize Hoppers // Folia - region threading
             profiler.push(() -> level + " " + level.dimension().identifier());
             profiler.push("tick");
+            // Luminol start - Portal rate limiter
+            regionizedWorldData.portalRateThrottler.begin();
+            // Luminol end
 
             try {
                 foliaProfiler.startTimer(level.tickTimerId); try { // Folia - profiler
@@ -1992,6 +1995,9 @@ public abstract class MinecraftServer extends ReentrantBlockableEventLoop<TickTa
             profiler.pop();
             profiler.pop();
             regionizedWorldData.explosionDensityCache.clear(); // Paper - Optimize explosions // Folia - region threading
+            // Luminol start - Portal rate limiter
+            regionizedWorldData.portalRateThrottler.done();
+            // Luminol end
         }
         //this.isIteratingOverLevels = false; // Paper - Throw exception on world create while being ticked // Folia - region threading
 
diff --git a/net/minecraft/server/level/ServerLevel.java b/net/minecraft/server/level/ServerLevel.java
index 015f0521aa65201fab990177867d10e0ea0611d4..adde187ad84ad75047096736de6e51ef81897d61 100644
--- a/net/minecraft/server/level/ServerLevel.java
+++ b/net/minecraft/server/level/ServerLevel.java
@@ -1536,8 +1536,15 @@ public class ServerLevel extends Level implements WorldGenLevel, ServerEntityGet
             // removed from region while ticking
             return;
         }
+        // Luminol start - Portal rate limiter
+        var worldData = entity.level().getCurrentWorldData();
+        if (entity.portalProcess != null && worldData.isPortalTeleportationOutOfRate()) {
+            return;
+        }
+        // Luminol end
         if (entity.handlePortal()) {
             // portalled
+            worldData.portalRateThrottler.increase(); // Luminol - Portal rate limiter
             return;
         }
         }
@@ -1584,8 +1591,15 @@ public class ServerLevel extends Level implements WorldGenLevel, ServerEntityGet
                 // removed from region while ticking
                 return;
             }
+                // Luminol start - Portal rate limiter
+                var worldData = entity.level().getCurrentWorldData();
+                if (entity.portalProcess != null && worldData.isPortalTeleportationOutOfRate()) {
+                    return;
+                }
+                // Luminol end
             if (entity.handlePortal()) {
                 // portalled
+                worldData.portalRateThrottler.increase(); // Luminol - Portal rate limiter
                 return;
             }
             // Folia end - region threading