Shiroha/shiroha-server/minecraft-patches/features/0046-Add-portal-rate-limiter.patch

From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: MrHua269 <mrhua269@gmail.com>
Date: Thu, 9 Jul 2026 10:17:22 +0800
Subject: [PATCH] Add portal rate limiter


diff --git a/io/papermc/paper/threadedregions/RegionizedWorldData.java b/io/papermc/paper/threadedregions/RegionizedWorldData.java
index df9a8fba86b61d2d2f82e40e0f317cab84faa2ff..7cbf93b183eaeb156467044ccdb2923e6d944438 100644
--- a/io/papermc/paper/threadedregions/RegionizedWorldData.java
+++ b/io/papermc/paper/threadedregions/RegionizedWorldData.java
@@ -157,6 +157,10 @@ public final class RegionizedWorldData {
             for (final ChunkHolder chunkHolder : from.chunkHoldersToBroadcast) {
                 into.chunkHoldersToBroadcast.add(chunkHolder);
             }
+            // Shiroha start - Add portal rate limiter
+            into.portalRateThrottler.mergeWith(from.portalRateThrottler);
+            from.portalRateThrottler.destroy();
+            // Shiroha end
         }
 
         @Override
@@ -322,6 +326,12 @@ public final class RegionizedWorldData {
                     into.chunkHoldersToBroadcast.add(chunkHolder);
                 }
             }
+            // Shiroha start - Add portal rate limiter
+            for (var worldData : dataSet) {
+                from.portalRateThrottler.splitInto(worldData.portalRateThrottler);
+            }
+            from.portalRateThrottler.destroy();
+            // Shiroha end
         }
     };
 
@@ -343,6 +353,35 @@ public final class RegionizedWorldData {
         return this.isHandlingTick;
     }
 
+    // Shiroha start - Add portal rate limiter
+    public final io.nanachiyo0721.shiroha.utils.RateThrottler portalRateThrottler = new io.nanachiyo0721.shiroha.utils.RateThrottler();
+    public final net.objecthunter.exp4j.Expression portalRateCapExpression = io.nanachiyo0721.shiroha.config.modules.function.PortalRateLimiterConfig.getExpressionIfConfigured();
+
+    private int computePortalRateCap() {
+        // expression mode is disabled
+        if (this.portalRateCapExpression == null) {
+            return io.nanachiyo0721.shiroha.config.modules.function.PortalRateLimiterConfig.maxPortalTeleportsPerTick;
+        }
+
+        final int tickingEntityCount = this.entityTickList.size();
+        final int tickingChunkCount = this.tickingChunks.size();
+        final int playerCount = this.localPlayers.size();
+
+        return io.nanachiyo0721.shiroha.config.modules.function.PortalRateLimiterConfig.computeExpression(
+                this.portalRateCapExpression,
+                tickingEntityCount,
+                tickingChunkCount,
+                playerCount
+        );
+    }
+    public boolean isPortalTeleportationOutOfRate() {
+        if (!io.nanachiyo0721.shiroha.config.modules.function.PortalRateLimiterConfig.enabled) {
+            return false;
+        }
+
+        return this.portalRateThrottler.isOutOfRate(this.computePortalRateCap());
+    }
+    // Shiroha 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 6025675b7004c9700ddc26638761f76d64ecc026..5be3e493f1638cc0befe5530c58ea15467a3a7ac 100644
--- a/net/minecraft/server/MinecraftServer.java
+++ b/net/minecraft/server/MinecraftServer.java
@@ -1932,6 +1932,9 @@ 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");
+            // Shiroha start - Add portal rate limiter
+            regionizedWorldData.portalRateThrottler.begin();
+            // Shiroha end
 
             try {
                 foliaProfiler.startTimer(level.tickTimerId); try { // Folia - profiler
@@ -1946,6 +1949,9 @@ public abstract class MinecraftServer extends ReentrantBlockableEventLoop<TickTa
             profiler.pop();
             profiler.pop();
             regionizedWorldData.explosionDensityCache.clear(); // Paper - Optimize explosions // Folia - region threading
+            // Shiroha start - Add portal rate limiter
+            regionizedWorldData.portalRateThrottler.done();
+            // Shiroha 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 5668f80c2ac1fcf2ac0e1e5378c789d7fce655f3..ecb1b98723e78e9d2f3ce182be8f78f8f32a52da 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;
         }
+        // Shiroha start - Add portal rate limiter
+        var worldData = entity.level().getCurrentWorldData();
+        if (entity.portalProcess != null && worldData.isPortalTeleportationOutOfRate()) {
+            return;
+        }
+        // Shiroha end
         if (entity.handlePortal()) {
             // portalled
+            worldData.portalRateThrottler.increase(); // Shiroha - Add portal rate limiter
             return;
         }
         }
@@ -1581,8 +1588,15 @@ public class ServerLevel extends Level implements WorldGenLevel, ServerEntityGet
                 // removed from region while ticking
                 return;
             }
+            // Shiroha start - Add portal rate limiter
+            var worldData = entity.level().getCurrentWorldData();
+            if (entity.portalProcess != null && worldData.isPortalTeleportationOutOfRate()) {
+                return;
+            }
+            // Shiroha end
             if (entity.handlePortal()) {
                 // portalled
+                worldData.portalRateThrottler.increase(); // Shiroha - Add portal rate limiter
                 return;
             }
             // Folia end - region threading