From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Shane Freeder <theboyetronic@gmail.com>
Date: Thu, 18 Feb 2021 20:23:28 +0000
Subject: [PATCH] misc debugging dumps


diff --git a/src/main/java/io/papermc/paper/util/TraceUtil.java b/src/main/java/io/papermc/paper/util/TraceUtil.java
new file mode 100644
index 0000000000000000000000000000000000000000..479bb92d159f33c54c2d9c39d8a63aa9e74d95b9
--- /dev/null
+++ b/src/main/java/io/papermc/paper/util/TraceUtil.java
@@ -0,0 +1,25 @@
+package io.papermc.paper.util;
+
+import org.bukkit.Bukkit;
+
+public final class TraceUtil {
+
+    public static void dumpTraceForThread(Thread thread, String reason) {
+        Bukkit.getLogger().warning(thread.getName() + ": " + reason);
+        StackTraceElement[] trace = StacktraceDeobfuscator.INSTANCE.deobfuscateStacktrace(thread.getStackTrace());
+        for (StackTraceElement traceElement : trace) {
+            Bukkit.getLogger().warning("\tat " + traceElement);
+        }
+    }
+
+    public static void dumpTraceForThread(String reason) {
+        final Throwable thr = new Throwable(reason);
+        StacktraceDeobfuscator.INSTANCE.deobfuscateThrowable(thr);
+        thr.printStackTrace();
+    }
+
+    public static void printStackTrace(Throwable thr) {
+        StacktraceDeobfuscator.INSTANCE.deobfuscateThrowable(thr);
+        thr.printStackTrace();
+    }
+}
diff --git a/src/main/java/net/minecraft/commands/Commands.java b/src/main/java/net/minecraft/commands/Commands.java
index 642d5c6849debc5a266605b0df30d55222339438..b34abf66c7dc756e88e08637af976f7794144d06 100644
--- a/src/main/java/net/minecraft/commands/Commands.java
+++ b/src/main/java/net/minecraft/commands/Commands.java
@@ -345,7 +345,7 @@ public class Commands {
         } catch (Exception exception) {
             MutableComponent ichatmutablecomponent = Component.literal(exception.getMessage() == null ? exception.getClass().getName() : exception.getMessage());
 
-            if (Commands.LOGGER.isDebugEnabled()) {
+            if (commandlistenerwrapper.getServer().isDebugging() || Commands.LOGGER.isDebugEnabled()) { // Paper - Debugging
                 Commands.LOGGER.error("Command exception: /{}", s, exception);
                 StackTraceElement[] astacktraceelement = exception.getStackTrace();
 
diff --git a/src/main/java/net/minecraft/server/MinecraftServer.java b/src/main/java/net/minecraft/server/MinecraftServer.java
index e1a15f3721e3c661be0185d65073a39f293f0589..8e205796d0c9abbf01bf6ec191e2dfc7b972a0dd 100644
--- a/src/main/java/net/minecraft/server/MinecraftServer.java
+++ b/src/main/java/net/minecraft/server/MinecraftServer.java
@@ -929,6 +929,7 @@ public abstract class MinecraftServer extends ReentrantBlockableEventLoop<TickTa
 
     // CraftBukkit start
     private boolean hasStopped = false;
+    private boolean hasLoggedStop = false; // Paper - Debugging
     private final Object stopLock = new Object();
     public final boolean hasStopped() {
         synchronized (this.stopLock) {
@@ -943,6 +944,7 @@ public abstract class MinecraftServer extends ReentrantBlockableEventLoop<TickTa
             if (this.hasStopped) return;
             this.hasStopped = true;
         }
+        if (!hasLoggedStop && isDebugging()) io.papermc.paper.util.TraceUtil.dumpTraceForThread("Server stopped"); // Paper - Debugging
         // CraftBukkit end
         if (this.metricsRecorder.isRecording()) {
             this.cancelRecordingMetrics();
@@ -1046,6 +1048,8 @@ public abstract class MinecraftServer extends ReentrantBlockableEventLoop<TickTa
     }
     public void safeShutdown(boolean waitForShutdown, boolean isRestarting) {
         this.isRestarting = isRestarting;
+        this.hasLoggedStop = true; // Paper - Debugging
+        if (isDebugging()) io.papermc.paper.util.TraceUtil.dumpTraceForThread("Server stopped"); // Paper - Debugging
         // Paper end
         this.running = false;
         if (waitForShutdown) {
diff --git a/src/main/java/net/minecraft/server/network/ServerConfigurationPacketListenerImpl.java b/src/main/java/net/minecraft/server/network/ServerConfigurationPacketListenerImpl.java
index 5457358bc76889153036818fdfd70a043ec4e40f..880e5c52746e9e3a9a1f42ec6461be54e3ee136c 100644
--- a/src/main/java/net/minecraft/server/network/ServerConfigurationPacketListenerImpl.java
+++ b/src/main/java/net/minecraft/server/network/ServerConfigurationPacketListenerImpl.java
@@ -70,6 +70,10 @@ public class ServerConfigurationPacketListenerImpl extends ServerCommonPacketLis
 
     @Override
     public void onDisconnect(DisconnectionDetails info) {
+        // Paper start - Debugging
+        if (net.minecraft.server.MinecraftServer.getServer().isDebugging()) {
+            ServerConfigurationPacketListenerImpl.LOGGER.info("{} lost connection: {}, while in configuration phase {}", this.gameProfile, info.reason().getString(), currentTask != null ? currentTask.type().id() : "null");
+        } else // Paper end
         ServerConfigurationPacketListenerImpl.LOGGER.info("{} lost connection: {}", this.gameProfile, info.reason().getString());
         super.onDisconnect(info);
     }
@@ -169,6 +173,11 @@ public class ServerConfigurationPacketListenerImpl extends ServerCommonPacketLis
             playerlist.placeNewPlayer(this.connection, entityplayer, this.createCookie(this.clientInformation));
         } catch (Exception exception) {
             ServerConfigurationPacketListenerImpl.LOGGER.error("Couldn't place player in world", exception);
+            // Paper start - Debugging
+            if (MinecraftServer.getServer().isDebugging()) {
+                exception.printStackTrace();
+            }
+            // Paper end - Debugging
             this.connection.send(new ClientboundDisconnectPacket(ServerConfigurationPacketListenerImpl.DISCONNECT_REASON_INVALID_DATA));
             this.connection.disconnect(ServerConfigurationPacketListenerImpl.DISCONNECT_REASON_INVALID_DATA);
         }
diff --git a/src/main/java/org/bukkit/craftbukkit/CraftServer.java b/src/main/java/org/bukkit/craftbukkit/CraftServer.java
index e9391811dc6ff954bdf1854e1e33e96931bcd2ac..e5a534c3cae53811899d33664b0a985c2442582c 100644
--- a/src/main/java/org/bukkit/craftbukkit/CraftServer.java
+++ b/src/main/java/org/bukkit/craftbukkit/CraftServer.java
@@ -1051,6 +1051,7 @@ public final class CraftServer implements Server {
                 plugin.getDescription().getFullName(),
                 "This plugin is not properly shutting down its async tasks when it is being reloaded.  This may cause conflicts with the newly loaded version of the plugin"
             ));
+            if (console.isDebugging()) io.papermc.paper.util.TraceUtil.dumpTraceForThread(worker.getThread(), "still running"); // Paper - Debugging
         }
         io.papermc.paper.plugin.PluginInitializerManager.reload(this.console); // Paper
         this.loadPlugins();