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Add /paper dumplisteners command (#8507) 

Co-authored-by: Jason Penilla <11360596+jpenilla@users.noreply.github.com>
Co-authored-by: TwoLeggedCat <80929284+TwoLeggedCat@users.noreply.github.com>
This commit is contained in:
Warrior 2022-11-23 23:28:38 +01:00 committed by GitHub
parent da230d521c
commit 8aff07afb0
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GPG Key ID: 4AEE18F83AFDEB23
2 changed files with 190 additions and 0 deletions
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37
patches/api/0409-Add-paper-dumplisteners-command.patch Normal file
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@ -0,0 +1,37 @@
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Warrior <50800980+Warriorrrr@users.noreply.github.com>
Date: Sat, 19 Nov 2022 19:46:44 +0100
Subject: [PATCH] Add /paper dumplisteners command
diff --git a/src/main/java/org/bukkit/event/HandlerList.java b/src/main/java/org/bukkit/event/HandlerList.java
index ed78cca71f83b296d082d0af147ca8d622c7606a..2292bd460ce2be113beb4ba6b4eb19350060f01c 100644
--- a/src/main/java/org/bukkit/event/HandlerList.java
+++ b/src/main/java/org/bukkit/event/HandlerList.java
@@ -33,6 +33,13 @@ public class HandlerList {
*/
private static ArrayList<HandlerList> allLists = new ArrayList<HandlerList>();
+ // Paper start
+ /**
+ * Event types which have instantiated a {@link HandlerList}.
+ */
+ private static final java.util.Set<String> EVENT_TYPES = java.util.concurrent.ConcurrentHashMap.newKeySet();
+ // Paper end
+
/**
* Bake all handler lists. Best used just after all normal event
* registration is complete, ie just after all plugins are loaded if
@@ -94,6 +101,12 @@ public class HandlerList {
* The HandlerList is then added to meta-list for use in bakeAll()
*/
public HandlerList() {
+ // Paper start
+ java.lang.StackWalker.getInstance(java.util.EnumSet.of(java.lang.StackWalker.Option.RETAIN_CLASS_REFERENCE), 4)
+ .walk(s -> s.filter(f -> Event.class.isAssignableFrom(f.getDeclaringClass())).findFirst())
+ .map(f -> f.getDeclaringClass().getName())
+ .ifPresent(EVENT_TYPES::add);
+ // Paper end
handlerslots = new EnumMap<EventPriority, ArrayList<RegisteredListener>>(EventPriority.class);
for (EventPriority o : EventPriority.values()) {
handlerslots.put(o, new ArrayList<RegisteredListener>());

153
patches/server/0943-Add-paper-dumplisteners-command.patch Normal file
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@ -0,0 +1,153 @@
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Warrior <50800980+Warriorrrr@users.noreply.github.com>
Date: Tue, 25 Oct 2022 21:15:37 +0200
Subject: [PATCH] Add /paper dumplisteners command
Co-authored-by: TwoLeggedCat <80929284+TwoLeggedCat@users.noreply.github.com>
diff --git a/src/main/java/io/papermc/paper/command/PaperCommand.java b/src/main/java/io/papermc/paper/command/PaperCommand.java
index 724592234e2a178a518f6ab7d09c3180780371a7..92154550b41b2e1d03deb1271b71bb3baa735e0a 100644
--- a/src/main/java/io/papermc/paper/command/PaperCommand.java
+++ b/src/main/java/io/papermc/paper/command/PaperCommand.java
@@ -2,6 +2,7 @@ package io.papermc.paper.command;
import io.papermc.paper.command.subcommands.ChunkDebugCommand;
import io.papermc.paper.command.subcommands.DumpItemCommand;
+import io.papermc.paper.command.subcommands.DumpListenersCommand;
import io.papermc.paper.command.subcommands.EntityCommand;
import io.papermc.paper.command.subcommands.FixLightCommand;
import io.papermc.paper.command.subcommands.HeapDumpCommand;
@@ -50,6 +51,7 @@ public final class PaperCommand extends Command {
commands.put(Set.of("syncloadinfo"), new SyncLoadInfoCommand());
commands.put(Set.of("dumpitem"), new DumpItemCommand());
commands.put(Set.of("mobcaps", "playermobcaps"), new MobcapsCommand());
+ commands.put(Set.of("dumplisteners"), new DumpListenersCommand());
return commands.entrySet().stream()
.flatMap(entry -> entry.getKey().stream().map(s -> Map.entry(s, entry.getValue())))
diff --git a/src/main/java/io/papermc/paper/command/subcommands/DumpListenersCommand.java b/src/main/java/io/papermc/paper/command/subcommands/DumpListenersCommand.java
new file mode 100644
index 0000000000000000000000000000000000000000..dab8d6fb489f8b3acc7c8fdaa1b5b6b83fa0eeb4
--- /dev/null
+++ b/src/main/java/io/papermc/paper/command/subcommands/DumpListenersCommand.java
@@ -0,0 +1,120 @@
+package io.papermc.paper.command.subcommands;
+
+import com.destroystokyo.paper.util.SneakyThrow;
+import io.papermc.paper.command.PaperSubcommand;
+import java.lang.invoke.MethodHandle;
+import java.lang.invoke.MethodHandles;
+import java.lang.reflect.Field;
+import java.util.Collections;
+import java.util.List;
+import java.util.Locale;
+import java.util.Set;
+import java.util.stream.Stream;
+import net.minecraft.server.MinecraftServer;
+import org.bukkit.Bukkit;
+import org.bukkit.command.CommandSender;
+import org.bukkit.event.HandlerList;
+import org.bukkit.plugin.Plugin;
+import org.checkerframework.checker.nullness.qual.NonNull;
+import org.checkerframework.framework.qual.DefaultQualifier;
+
+import static net.kyori.adventure.text.Component.space;
+import static net.kyori.adventure.text.Component.text;
+import static net.kyori.adventure.text.format.NamedTextColor.GRAY;
+import static net.kyori.adventure.text.format.NamedTextColor.GREEN;
+import static net.kyori.adventure.text.format.NamedTextColor.RED;
+
+@DefaultQualifier(NonNull.class)
+public final class DumpListenersCommand implements PaperSubcommand {
+ private static final MethodHandle EVENT_TYPES_HANDLE;
+
+ static {
+ try {
+ final Field eventTypesField = HandlerList.class.getDeclaredField("EVENT_TYPES");
+ eventTypesField.setAccessible(true);
+ EVENT_TYPES_HANDLE = MethodHandles.lookup().unreflectGetter(eventTypesField);
+ } catch (final ReflectiveOperationException e) {
+ throw new RuntimeException(e);
+ }
+ }
+
+ @Override
+ public boolean execute(final CommandSender sender, final String subCommand, final String[] args) {
+ this.doDumpListeners(sender, args);
+ return true;
+ }
+
+ private void doDumpListeners(final CommandSender sender, final String[] args) {
+ if (args.length == 0) {
+ sender.sendMessage(text("Usage: /paper dumplisteners [className]", RED));
+ return;
+ }
+
+ try {
+ final HandlerList handlers = (HandlerList) findClass(args[0]).getMethod("getHandlerList").invoke(null);
+
+ if (handlers.getRegisteredListeners().length == 0) {
+ sender.sendMessage(text(args[0] + " does not have any registered listeners."));
+ return;
+ }
+
+ sender.sendMessage(text("Listeners for " + args[0] + ":"));
+
+ Stream.of(handlers.getRegisteredListeners())
+ .map(listener -> text(listener.getPlugin().getName(), GREEN)
+ .append(space())
+ .append(text("(" + listener.getListener().getClass().getName() + ")", GRAY)
+ .hoverEvent(text("Priority: " + listener.getPriority().name() + " (" + listener.getPriority().getSlot() + ")", GRAY))))
+ .forEach(sender::sendMessage);
+
+ sender.sendMessage(text("Total listeners: " + handlers.getRegisteredListeners().length));
+
+ } catch (final ClassNotFoundException e) {
+ sender.sendMessage(text("Unable to find a class named '" + args[0] + "'. Make sure to use the fully qualified name.", RED));
+ } catch (final NoSuchMethodException e) {
+ sender.sendMessage(text("Class '" + args[0] + "' does not have a valid getHandlerList method.", RED));
+ } catch (final ReflectiveOperationException e) {
+ sender.sendMessage(text("Something went wrong, see the console for more details.", RED));
+ MinecraftServer.LOGGER.warn("Error occurred while dumping listeners for class " + args[0], e);
+ }
+ }
+
+ @Override
+ public List<String> tabComplete(final CommandSender sender, final String subCommand, final String[] args) {
+ return switch (args.length) {
+ case 0 -> List.copyOf(getEventClasses());
+ case 1 -> getEventClasses().stream()
+ .filter(clazz -> clazz.toLowerCase(Locale.ROOT).contains(args[0].toLowerCase(Locale.ROOT)))
+ .toList();
+ default -> Collections.emptyList();
+ };
+ }
+
+ @SuppressWarnings("unchecked")
+ private static Set<String> getEventClasses() {
+ try {
+ return (Set<String>) EVENT_TYPES_HANDLE.invokeExact();
+ } catch (final Throwable e) {
+ SneakyThrow.sneaky(e);
+ return Collections.emptySet(); // Unreachable
+ }
+ }
+
+ private static Class<?> findClass(final String className) throws ClassNotFoundException {
+ try {
+ return Class.forName(className);
+ } catch (final ClassNotFoundException ignore) {
+ for (final Plugin plugin : Bukkit.getServer().getPluginManager().getPlugins()) {
+ if (!plugin.isEnabled()) {
+ continue;
+ }
+
+ try {
+ return Class.forName(className, false, plugin.getClass().getClassLoader());
+ } catch (final ClassNotFoundException ignore0) {
+ }
+ }
+ }
+ throw new ClassNotFoundException(className);
+ }
+}