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PaperMC/Spigot-Server-Patches/0272-Provide-option-to-use-a-versioned-world-folder-for-t.patch
Spottedleaf d189ac1db3 Fix RegionFileCache#hasRegionFile (#2062) 
also remove the pointless synchronization on
RegionFileCache#getRegionFileName
2019-05-20 03:26:17 +01:00

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From cfb0efe00f65ee5d31eab9a11261f0481b22cdb1 Mon Sep 17 00:00:00 2001
From: Aikar <aikar@aikar.co>
Date: Sun, 29 Jul 2018 15:48:50 -0400
Subject: [PATCH] Provide option to use a versioned world folder for testing
This should not ever be used in production!!
This setting is intended for testing so you can try out converting your world
without actually modifying the world files.
This will add some additional overhead to your world, but you're
just testing anyways so that's not a big deal :)
Will store in a folder named after the current version.
PlayerData and Data folders are copied on server start, so there
may be some delay there, but region files are only copied on demand.
This is highly experiemental so backup your world before relying on this to not modify it
diff --git a/src/main/java/com/destroystokyo/paper/PaperConfig.java b/src/main/java/com/destroystokyo/paper/PaperConfig.java
index a9b71c85d5..8c3880c838 100644
--- a/src/main/java/com/destroystokyo/paper/PaperConfig.java
+++ b/src/main/java/com/destroystokyo/paper/PaperConfig.java
@@ -13,6 +13,7 @@ import java.util.List;
import java.util.Map;
import java.util.concurrent.TimeUnit;
import java.util.logging.Level;
+import java.util.logging.Logger;
import java.util.regex.Pattern;
import com.google.common.collect.Lists;
@@ -287,4 +288,27 @@ public class PaperConfig {
Bukkit.getLogger().log(Level.INFO, "Using Aikar's Alternative Luck Formula to apply Luck attribute to all loot pool calculations. See https://luckformula.emc.gs");
}
}
+
+ public static boolean useVersionedWorld = false;
+ private static void useVersionedWorld() {
+ useVersionedWorld = getBoolean("settings.use-versioned-world", false);
+ if (useVersionedWorld) {
+ Logger logger = Bukkit.getLogger();
+ String ver = MinecraftServer.getServer().getVersion();
+ logger.log(Level.INFO, "******************************************************");
+ logger.log(Level.INFO, "*** Using a versioned world folder. Your world will be saved");
+ logger.log(Level.INFO, "*** to into the " + ver + " folder, but copied from your current world.");
+ logger.log(Level.INFO, "*** ");
+ logger.log(Level.INFO, "*** This setting should not be used in your real world!!!");
+ logger.log(Level.INFO, "*** If you want to retain the new world, you need to move ");
+ logger.log(Level.INFO, "*** the folders out of the " + ver + " folder and overwrite existing");
+ logger.log(Level.INFO, "*** ");
+ logger.log(Level.INFO, "*** Deleting the " + ver + " folder will cause it to recreate again");
+ logger.log(Level.INFO, "*** from your unversioned world files.");
+ logger.log(Level.INFO, "*** ");
+ logger.log(Level.INFO, "*** You should backup your original world files incase something goes");
+ logger.log(Level.INFO, "*** wrong with this system! This is not a backup system.");
+ logger.log(Level.INFO, "******************************************************");
+ }
+ }
}
diff --git a/src/main/java/net/minecraft/server/RegionFileCache.java b/src/main/java/net/minecraft/server/RegionFileCache.java
index 6425b14f2c..74f102adf5 100644
--- a/src/main/java/net/minecraft/server/RegionFileCache.java
+++ b/src/main/java/net/minecraft/server/RegionFileCache.java
@@ -10,13 +10,41 @@ import java.io.IOException;
import javax.annotation.Nullable;
import com.destroystokyo.paper.PaperConfig; // Paper
+import org.apache.logging.log4j.LogManager;
+
public abstract class RegionFileCache implements AutoCloseable {
public final Long2ObjectLinkedOpenHashMap<RegionFile> cache = new Long2ObjectLinkedOpenHashMap();
private final File a;
+ // Paper start
+ private final File templateWorld;
+ private final File actualWorld;
+ private boolean useAltWorld;
+ // Paper end
+
protected RegionFileCache(File file) {
this.a = file;
+ // Paper end
+
+ this.actualWorld = file;
+ if (com.destroystokyo.paper.PaperConfig.useVersionedWorld) {
+ this.useAltWorld = true;
+ String name = file.getName();
+ File container = file.getParentFile().getParentFile();
+ if (name.equals("DIM-1") || name.equals("DIM1")) {
+ container = container.getParentFile();
+ }
+ this.templateWorld = new File(container, name);
+ File region = new File(file, "region");
+ if (!region.exists()) {
+ region.mkdirs();
+ }
+ } else {
+ this.useAltWorld = false;
+ this.templateWorld = file;
+ }
+ // Paper start
}
private RegionFile a(ChunkCoordIntPair chunkcoordintpair, boolean existingOnly) throws IOException { // CraftBukkit
@@ -34,6 +62,7 @@ public abstract class RegionFileCache implements AutoCloseable {
this.a.mkdirs();
}
+ copyIfNeeded(chunkcoordintpair.x, chunkcoordintpair.z); // Paper
File file = new File(this.a, "r." + chunkcoordintpair.getRegionX() + "." + chunkcoordintpair.getRegionZ() + ".mca");
if (existingOnly && !file.exists()) return null; // CraftBukkit
RegionFile regionfile1 = new RegionFile(file);
@@ -43,6 +72,15 @@ public abstract class RegionFileCache implements AutoCloseable {
}
}
+ public static File getRegionFileName(File file, int i, int j) {
+ File file1 = new File(file, "region");
+ return new File(file1, "r." + (i >> 5) + "." + (j >> 5) + ".mca");
+ }
+ public synchronized boolean hasRegionFile(File file, int i, int j) {
+ return cache.containsKey(ChunkCoordIntPair.pair(i, j));
+ }
+ // Paper End
+
@Nullable
public NBTTagCompound read(ChunkCoordIntPair chunkcoordintpair) throws IOException {
RegionFile regionfile = this.a(chunkcoordintpair, false); // CraftBukkit
@@ -132,9 +170,33 @@ public abstract class RegionFileCache implements AutoCloseable {
// CraftBukkit start
public boolean chunkExists(ChunkCoordIntPair pos) throws IOException {
+ copyIfNeeded(pos.x, pos.z); // Paper
RegionFile regionfile = a(pos, true);
return regionfile != null ? regionfile.d(pos) : false;
}
// CraftBukkit end
+
+ private void copyIfNeeded(int x, int z) {
+ if (!useAltWorld) {
+ return;
+ }
+ synchronized (RegionFileCache.class) {
+ if (hasRegionFile(this.actualWorld, x, z)) {
+ return;
+ }
+ File actual = RegionFileCache.getRegionFileName(this.actualWorld, x, z);
+ File template = RegionFileCache.getRegionFileName(this.templateWorld, x, z);
+ if (!actual.exists() && template.exists()) {
+ try {
+ net.minecraft.server.MinecraftServer.LOGGER.info("Copying" + template + " to " + actual);
+ java.nio.file.Files.copy(template.toPath(), actual.toPath(), java.nio.file.StandardCopyOption.COPY_ATTRIBUTES);
+ } catch (IOException e1) {
+ LogManager.getLogger().error("Error copying " + template + " to " + actual, e1);
+ MinecraftServer.getServer().safeShutdown(false);
+ com.destroystokyo.paper.util.SneakyThrow.sneaky(e1);
+ }
+ }
+ }
+ }
}
diff --git a/src/main/java/net/minecraft/server/WorldNBTStorage.java b/src/main/java/net/minecraft/server/WorldNBTStorage.java
index 350ac42d6b..eaae446861 100644
--- a/src/main/java/net/minecraft/server/WorldNBTStorage.java
+++ b/src/main/java/net/minecraft/server/WorldNBTStorage.java
@@ -31,6 +31,58 @@ public class WorldNBTStorage implements IPlayerFileData {
public WorldNBTStorage(File file, String s, @Nullable MinecraftServer minecraftserver, DataFixer datafixer) {
this.a = datafixer;
+ // Paper start
+ if (com.destroystokyo.paper.PaperConfig.useVersionedWorld) {
+ File origBaseDir = new File(file, s);
+ final String currentVersion = MinecraftServer.getServer().getVersion();
+ file = new File(file, currentVersion);
+ File baseDir = new File(file, s);
+
+ if (!baseDir.exists() && origBaseDir.exists() && !baseDir.mkdirs()) {
+ LogManager.getLogger().error("Could not create world directory for " + file);
+ System.exit(1);
+ }
+
+ try {
+ boolean printedHeader = false;
+ String[] dirs = {"advancements", "data", "datapacks", "playerdata", "stats"};
+ for (String dir : dirs) {
+ File origPlayerData = new File(origBaseDir, dir);
+ File targetPlayerData = new File(baseDir, dir);
+ if (origPlayerData.exists() && !targetPlayerData.exists()) {
+ if (!printedHeader) {
+ LogManager.getLogger().info("**** VERSIONED WORLD - Copying files");
+ printedHeader = true;
+ }
+ LogManager.getLogger().info("- Copying: " + dir);
+ org.apache.commons.io.FileUtils.copyDirectory(origPlayerData, targetPlayerData);
+ }
+ }
+
+ String[] files = {"level.dat", "level.dat_old", "session.lock", "uid.dat"};
+ for (String fileName : files) {
+ File origPlayerData = new File(origBaseDir, fileName);
+ File targetPlayerData = new File(baseDir, fileName);
+ if (origPlayerData.exists() && !targetPlayerData.exists()) {
+ if (!printedHeader) {
+ LogManager.getLogger().info("- Copying files");
+ printedHeader = true;
+ }
+ LogManager.getLogger().info("- Copying: " + fileName);
+ org.apache.commons.io.FileUtils.copyFile(origPlayerData, targetPlayerData);
+
+ }
+ }
+ if (printedHeader) {
+ LogManager.getLogger().info("**** VERSIONED WORLD - Copying DONE");
+ }
+ } catch (IOException e) {
+ LogManager.getLogger().error("Error copying versioned world data for " + origBaseDir + " to " + baseDir, e);
+ com.destroystokyo.paper.util.SneakyThrow.sneaky(e);
+ }
+
+ }
+ // Paper end
this.baseDir = new File(file, s);
this.baseDir.mkdirs();
this.playerDir = new File(this.baseDir, "playerdata");
--
2.21.0
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