Limit TNT Detonations per tick

This gives a per-world control on how much TNT will be processed per-tick,
preventing a massive TNT detonation from lagging out the server.

By: Aikar <aikar@aikar.co>

paper-server/patches/sources/net/minecraft/world/entity/item/PrimedTnt.java.patch

@@ -21,7 +21,15 @@
  
      public PrimedTnt(EntityType<? extends PrimedTnt> type, Level world) {
          super(type, world);
-@@ -107,10 +114,13 @@
+@@ -94,6 +101,7 @@
+ 
+     @Override
+     public void tick() {
++        if (this.level().spigotConfig.maxTntTicksPerTick > 0 && ++this.level().spigotConfig.currentPrimedTnt > this.level().spigotConfig.maxTntTicksPerTick) { return; } // Spigot
+         this.handlePortal();
+         this.applyGravity();
+         this.move(MoverType.SELF, this.getDeltaMovement());
+@@ -107,10 +115,13 @@
  
          this.setFuse(i);
          if (i <= 0) {
@@ -36,7 +44,7 @@
          } else {
              this.updateInWaterStateAndDoFluidPushing();
              if (this.level().isClientSide) {
-@@ -121,7 +131,13 @@
+@@ -121,7 +132,13 @@
      }
  
      private void explode() {

paper-server/patches/sources/net/minecraft/world/level/Level.java.patch

@@ -208,7 +208,7 @@
              LevelChunk chunk = this.getChunkAt(pos);
              Block block = state.getBlock();
 -            BlockState iblockdata1 = chunk.setBlockState(pos, state, (flags & 64) != 0);
- 
++
 +            // CraftBukkit start - capture blockstates
 +            boolean captured = false;
 +            if (this.captureBlockStates && !this.capturedBlockStates.containsKey(pos)) {
@@ -217,7 +217,7 @@
 +                captured = true;
 +            }
 +            // CraftBukkit end
-+
+ 
 +            BlockState iblockdata1 = chunk.setBlockState(pos, state, (flags & 64) != 0, (flags & 1024) == 0); // CraftBukkit custom NO_PLACE flag
 +
              if (iblockdata1 == null) {
@@ -373,13 +373,14 @@
          Iterator<TickingBlockEntity> iterator = this.blockEntityTickers.iterator();
          boolean flag = this.tickRateManager().runsNormally();
  
-@@ -459,13 +661,16 @@
+@@ -459,13 +661,17 @@
              }
          }
  
 +        this.timings.tileEntityTick.stopTiming(); // Spigot
          this.tickingBlockEntities = false;
          gameprofilerfiller.pop();
++        this.spigotConfig.currentPrimedTnt = 0; // Spigot
      }
  
      public <T extends Entity> void guardEntityTick(Consumer<T> tickConsumer, T entity) {
@@ -390,7 +391,7 @@
          } catch (Throwable throwable) {
              CrashReport crashreport = CrashReport.forThrowable(throwable, "Ticking entity");
              CrashReportCategory crashreportsystemdetails = crashreport.addCategory("Entity being ticked");
-@@ -510,13 +715,29 @@
+@@ -510,13 +716,29 @@
      @Nullable
      @Override
      public BlockEntity getBlockEntity(BlockPos pos) {
@@ -421,7 +422,7 @@
              this.getChunkAt(blockposition).addAndRegisterBlockEntity(blockEntity);
          }
      }
-@@ -643,7 +864,7 @@
+@@ -643,7 +865,7 @@
  
                  for (int k = 0; k < j; ++k) {
                      EnderDragonPart entitycomplexpart = aentitycomplexpart[k];
@@ -430,7 +431,7 @@
  
                      if (t0 != null && predicate.test(t0)) {
                          result.add(t0);
-@@ -912,7 +1133,7 @@
+@@ -912,7 +1134,7 @@
  
      public static enum ExplosionInteraction implements StringRepresentable {
  

paper-server/src/main/java/org/spigotmc/SpigotWorldConfig.java

@@ -356,4 +356,15 @@ public class SpigotWorldConfig
         this.sprintMultiplier = (float) this.getDouble( "hunger.sprint-multiplier", 0.1 );
         this.otherMultiplier = (float) this.getDouble( "hunger.other-multiplier", 0.0 );
     }
+
+    public int currentPrimedTnt = 0;
+    public int maxTntTicksPerTick;
+    private void maxTntPerTick() {
+        if ( SpigotConfig.version < 7 )
+        {
+            this.set( "max-tnt-per-tick", 100 );
+        }
+        this.maxTntTicksPerTick = this.getInt( "max-tnt-per-tick", 100 );
+        this.log( "Max TNT Explosions: " + this.maxTntTicksPerTick );
+    }
 }