Paper/patches/server/0866-Add-debug-for-invalid-GameProfiles-on-skull-blocks-i.patch

From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Jason Penilla <11360596+jpenilla@users.noreply.github.com>
Date: Sat, 26 Feb 2022 13:27:31 -0700
Subject: [PATCH] Add debug for invalid GameProfiles on skull blocks/items

Improves the error message for placed in world skull blocks by default,
also adds 'Paper.debugInvalidSkullProfiles' system property which can be
set to 'true' for extra debug info (trace of updateGameprofile caller).

diff --git a/src/main/java/net/minecraft/world/level/block/entity/SkullBlockEntity.java b/src/main/java/net/minecraft/world/level/block/entity/SkullBlockEntity.java
index c1703a67a615f563dab4fb442a6df7082229af57..4613a343d3ca5f76992f2bd1e55bdc0833abcab6 100644
--- a/src/main/java/net/minecraft/world/level/block/entity/SkullBlockEntity.java
+++ b/src/main/java/net/minecraft/world/level/block/entity/SkullBlockEntity.java
@@ -143,13 +143,28 @@ public class SkullBlockEntity extends BlockEntity {
         updateGameprofile(this.owner, (owner) -> {
             this.owner = owner;
             this.setChanged();
+            // Paper start
+        }, () -> {
+            final @Nullable Level level = this.getLevel();
+            return "SkullBlockEntity at " + this.getBlockPos() + (level == null ? "" : (" in level: " + level.dimension().location()));
+            // Paper end
         });
     }
 
     public static void updateGameprofile(@Nullable GameProfile owner, Consumer<GameProfile> callback) {
+        // Paper start
+        updateGameprofile(owner, callback, null);
+    }
+
+    private static final boolean DEBUG_INVALID_SKULL_PROFILES = Boolean.getBoolean("Paper.debugInvalidSkullProfiles");
+
+    public static void updateGameprofile(@Nullable GameProfile owner, Consumer<GameProfile> callback, final @Nullable java.util.function.Supplier<String> debugInfo) {
         if (owner != null && !StringUtil.isNullOrEmpty(owner.getName()) && (!owner.isComplete() || !owner.getProperties().containsKey("textures")) && profileCache != null && sessionService != null) {
+            final @Nullable Throwable trace = DEBUG_INVALID_SKULL_PROFILES ? new Throwable("updateGameprofile caller debug trace") : null;
             profileCache.getAsync(owner.getName(), (profile) -> {
                 Util.PROFILE_EXECUTOR.execute(() -> { // Paper - not a good idea to use BLOCKING OPERATIONS on the worldgen executor
+                    try {
+                    // Paper end
                     Util.ifElse(profile, (profilex) -> {
                         Property property = Iterables.getFirst(profilex.getProperties().get("textures"), (Property)null);
                         if (property == null) {
@@ -166,6 +181,20 @@ public class SkullBlockEntity extends BlockEntity {
                             callback.accept(owner);
                         });
                     });
+                    // Paper start
+                    } catch (final Exception ex) {
+                        if (trace != null) {
+                            ex.addSuppressed(trace);
+                        }
+                        final String ownerMessage = "Original profile: '" + owner + "'";
+                        final String debugMessage = " Run with -DPaper.debugInvalidSkullProfiles=true for further debug information.";
+                        final String message = ownerMessage + (trace == null ? debugMessage : "");
+                        if (debugInfo == null) {
+                            throw new RuntimeException(message, ex);
+                        }
+                        throw new RuntimeException(debugInfo.get() + " " + message, ex);
+                    }
+                    // Paper end
                 });
             });
         } else {