SakuraMC/patches/server/0004-Local-Config-and-Value-Storage-API.patch

From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Samsuik <40902469+Samsuik@users.noreply.github.com>
Date: Tue, 21 Nov 2023 23:24:24 +0000
Subject: [PATCH] Local Config and Value Storage API


diff --git a/src/main/java/me/samsuik/sakura/local/config/LocalConfigManager.java b/src/main/java/me/samsuik/sakura/local/config/LocalConfigManager.java
new file mode 100644
index 0000000000000000000000000000000000000000..a3a09b8d58589883c7c465597bc64502bbfa0d88
--- /dev/null
+++ b/src/main/java/me/samsuik/sakura/local/config/LocalConfigManager.java
@@ -0,0 +1,143 @@
+package me.samsuik.sakura.local.config;
+
+import it.unimi.dsi.fastutil.longs.Long2ObjectMap;
+import it.unimi.dsi.fastutil.longs.Long2ObjectOpenHashMap;
+import it.unimi.dsi.fastutil.longs.Long2ObjectRBTreeMap;
+import it.unimi.dsi.fastutil.longs.Long2ObjectSortedMap;
+import it.unimi.dsi.fastutil.objects.Object2ObjectOpenHashMap;
+import me.samsuik.sakura.local.LocalRegion;
+import me.samsuik.sakura.local.storage.LocalStorageHandler;
+import me.samsuik.sakura.local.storage.LocalValueStorage;
+import me.samsuik.sakura.utils.objects.Expiry;
+import net.minecraft.core.BlockPos;
+import net.minecraft.server.MinecraftServer;
+import net.minecraft.world.level.ChunkPos;
+import net.minecraft.world.level.Level;
+import org.bukkit.Location;
+
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Map;
+
+public final class LocalConfigManager implements LocalStorageHandler {
+
+    private final Map<LocalRegion, LocalValueStorage> storageMap = new Object2ObjectOpenHashMap<>();
+    // tree is a tree. it may not be correct but it works.
+    private final Long2ObjectRBTreeMap<LocalRegion> regionTree = new Long2ObjectRBTreeMap<>();
+    private final Long2ObjectMap<LocalValueConfig> configMap = new Long2ObjectOpenHashMap<>();
+    private final Level level;
+
+    public LocalConfigManager(Level level) {
+        this.level = level;
+    }
+
+    @Override
+    public LocalRegion locate(Location location, int searchDistance) {
+        return this.locate(location.getBlockX(), location.getBlockZ(), searchDistance);
+    }
+
+    @Override
+    public synchronized LocalRegion locate(int x, int z, int searchDistance) {
+        long search = (long) searchDistance << 32;
+        long coordinate = ChunkPos.asLong(x, z);
+
+        // all regions below the coordinate (they're stored with the minX, minZ)
+        Long2ObjectSortedMap<LocalRegion> head = this.regionTree.headMap(coordinate);
+
+        if (head.isEmpty()) return null;
+
+        for (Long2ObjectMap.Entry<LocalRegion> entry : head.long2ObjectEntrySet()) {
+            // this has no respect for the x coordinate, but it works
+            if (coordinate - entry.getLongKey() > search) {
+                break;
+            }
+
+            // check if the region we found contains the position
+            if (entry.getValue().contains(x, z)) {
+                return entry.getValue();
+            }
+        }
+
+        return null;
+    }
+
+    @Override
+    public synchronized LocalValueStorage get(LocalRegion region) {
+        return this.storageMap.get(region);
+    }
+
+    @Override
+    public synchronized boolean has(LocalRegion region) {
+        return this.storageMap.containsKey(region);
+    }
+
+    @Override
+    public synchronized void put(LocalRegion region, LocalValueStorage storage) {
+        assert region  != null : "region cannot be null";
+        assert storage != null : "storage cannot be null";
+
+        long base = ChunkPos.asLong(region.minX(), region.minZ());
+        this.ensureNotOverlapping(region);
+
+        this.storageMap.put(region, storage);
+        this.regionTree.put(base, region);
+    }
+
+    @Override
+    public synchronized void remove(LocalRegion region) {
+        assert region != null : "region cannot be null";
+
+        long base = ChunkPos.asLong(region.minX(), region.minZ());
+
+        this.storageMap.remove(region);
+        this.regionTree.remove(base);
+    }
+
+    @Override
+    public synchronized List<LocalRegion> regions() {
+        return new ArrayList<>(this.storageMap.keySet());
+    }
+
+    public synchronized LocalValueConfig config(BlockPos position) {
+        long chunkKey = ChunkPos.asLong(position.getX() >> 4, position.getZ() >> 4);
+
+        LocalValueConfig local = this.configMap.computeIfAbsent(chunkKey, (key) -> {
+            LocalValueConfig config = new LocalValueConfig(new Expiry(MinecraftServer.currentTickLong, 600));
+
+            // defaults from sakura config
+            config.init(level);
+
+            // search the entire map if we have to for a region
+            LocalRegion region = this.locate(position.getX(), position.getZ(), Integer.MAX_VALUE);
+
+            if (region != null) {
+                // load local values
+                config.load(this.storageMap.get(region));
+            }
+
+            return config;
+        });
+
+        local.expiry().refresh(MinecraftServer.currentTickLong);
+        return local;
+    }
+
+    public synchronized void expire(long tick) {
+        if (tick % 200 != 0) return;
+
+        // remove expired
+        this.configMap.values().removeIf(obj -> obj.expiry().isExpired(tick));
+    }
+
+    private void ensureNotOverlapping(LocalRegion region) {
+        long top = ChunkPos.asLong(region.maxX(), region.maxZ());
+        Long2ObjectSortedMap<LocalRegion> head = this.regionTree.headMap(top);
+
+        for (LocalRegion present : head.values()) {
+            if (present != region && present.intersects(region)) {
+                throw new UnsupportedOperationException("overlapping regions");
+            }
+        }
+    }
+
+}
diff --git a/src/main/java/me/samsuik/sakura/local/config/LocalValueConfig.java b/src/main/java/me/samsuik/sakura/local/config/LocalValueConfig.java
new file mode 100644
index 0000000000000000000000000000000000000000..f0037f98e93fd1f0dea9c224ba402ebcacf9b21f
--- /dev/null
+++ b/src/main/java/me/samsuik/sakura/local/config/LocalValueConfig.java
@@ -0,0 +1,59 @@
+package me.samsuik.sakura.local.config;
+
+import io.papermc.paper.configuration.WorldConfiguration.Misc.RedstoneImplementation;
+import it.unimi.dsi.fastutil.objects.Reference2ObjectOpenHashMap;
+import me.samsuik.sakura.explosion.durable.DurableMaterial;
+import me.samsuik.sakura.local.LocalValueKey;
+import me.samsuik.sakura.local.storage.LocalValueStorage;
+import me.samsuik.sakura.physics.PhysicsVersion;
+import me.samsuik.sakura.utils.objects.Expiry;
+import net.minecraft.world.level.Level;
+import net.minecraft.world.level.block.Block;
+import org.bukkit.craftbukkit.util.CraftMagicNumbers;
+
+import java.util.Map;
+
+public final class LocalValueConfig {
+
+    private final Expiry expiry;
+    public Map<Block, DurableMaterial> durableMaterials;
+    public PhysicsVersion physicsVersion;
+    public RedstoneImplementation redstoneImplementation;
+
+    LocalValueConfig(Expiry expiry) {
+        this.expiry = expiry;
+    }
+
+    void init(Level level) {
+        // default materials
+        this.durableMaterials = new Reference2ObjectOpenHashMap<>(level.sakuraConfig().cannons.explosion.durableMaterials);
+
+        // physics version
+        this.physicsVersion = level.sakuraConfig().cannons.mechanics.physicsVersion;
+
+        // redstone implementation
+        this.redstoneImplementation = level.paperConfig().misc.redstoneImplementation;
+    }
+
+    void load(LocalValueStorage storage) {
+        // local materials
+        storage.value(LocalValueKey.DURABLE_MATERIALS, true).forEach(((material, entry) -> {
+            this.durableMaterials.put(CraftMagicNumbers.getBlock(material), new DurableMaterial(entry.getKey(), entry.getValue()));
+        }));
+
+        // physics version
+        if (storage.exists(LocalValueKey.PHYSICS_VERSION)) {
+            this.physicsVersion = storage.value(LocalValueKey.PHYSICS_VERSION);
+        }
+
+        // redstone implementation
+        if (storage.exists(LocalValueKey.REDSTONE_IMPLEMENTATION)) {
+            this.redstoneImplementation = RedstoneImplementation.values()[storage.value(LocalValueKey.REDSTONE_IMPLEMENTATION).ordinal()];
+        }
+    }
+
+    Expiry expiry() {
+        return expiry;
+    }
+
+}
diff --git a/src/main/java/net/minecraft/server/MinecraftServer.java b/src/main/java/net/minecraft/server/MinecraftServer.java
index ca9013a7141a4e6b5b45651961dd977929a0756b..1f169b9bc09052137187654a7331033779694ad4 100644
--- a/src/main/java/net/minecraft/server/MinecraftServer.java
+++ b/src/main/java/net/minecraft/server/MinecraftServer.java
@@ -1743,6 +1743,7 @@ public abstract class MinecraftServer extends ReentrantBlockableEventLoop<TickTa
             this.profiler.pop();
             this.profiler.pop();
             worldserver.explosionDensityCache.clear(); // Paper - Optimize explosions
+            worldserver.localConfig().expire(currentTickLong); // Sakura
         }
         this.isIteratingOverLevels = false; // Paper - Throw exception on world create while being ticked
 
diff --git a/src/main/java/net/minecraft/world/level/Level.java b/src/main/java/net/minecraft/world/level/Level.java
index a0a68ff09689d457f3c6e17f3e5d6d595f84684a..702bd6f2468559d425a95f8ad2622e98c373c065 100644
--- a/src/main/java/net/minecraft/world/level/Level.java
+++ b/src/main/java/net/minecraft/world/level/Level.java
@@ -177,6 +177,12 @@ public abstract class Level implements LevelAccessor, AutoCloseable {
         return this.sakuraConfig;
     }
     // Sakura end
+    // Sakura start
+    private final me.samsuik.sakura.local.config.LocalConfigManager localConfig = new me.samsuik.sakura.local.config.LocalConfigManager(this);
+    public final me.samsuik.sakura.local.config.LocalConfigManager localConfig() {
+        return this.localConfig;
+    }
+    // Sakura end
 
     public final com.destroystokyo.paper.antixray.ChunkPacketBlockController chunkPacketBlockController; // Paper - Anti-Xray
     public final co.aikar.timings.WorldTimingsHandler timings; // Paper
diff --git a/src/main/java/org/bukkit/craftbukkit/CraftWorld.java b/src/main/java/org/bukkit/craftbukkit/CraftWorld.java
index 00357d78182b3ff87e3d9a45705b072af56739c8..a2c2e2a5c5225c136ed325e7ce8917a366f599d2 100644
--- a/src/main/java/org/bukkit/craftbukkit/CraftWorld.java
+++ b/src/main/java/org/bukkit/craftbukkit/CraftWorld.java
@@ -244,6 +244,13 @@ public class CraftWorld extends CraftRegionAccessor implements World {
     }
     // Paper end
 
+    // Sakura start
+    @Override
+    public me.samsuik.sakura.local.storage.LocalStorageHandler getStorageHandler() {
+        return this.getHandle().localConfig();
+    }
+    // Sakura end
+
     private static final Random rand = new Random();
 
     public CraftWorld(ServerLevel world, ChunkGenerator gen, BiomeProvider biomeProvider, Environment env) {