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 fd4f37711989431f997d77fb0917f8a9232ce53f..46bf42d5ea9e7b046f962531c5962d287cf44a41 100644 --- a/src/main/java/io/papermc/paper/command/PaperCommand.java +++ b/src/main/java/io/papermc/paper/command/PaperCommand.java @@ -41,6 +41,7 @@ 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..aa44d4685de3caee4131449bead7a084868ff976 --- /dev/null +++ b/src/main/java/io/papermc/paper/command/subcommands/DumpListenersCommand.java @@ -0,0 +1,172 @@ +package io.papermc.paper.command.subcommands; + +import com.destroystokyo.paper.util.SneakyThrow; +import io.papermc.paper.command.PaperSubcommand; +import java.io.File; +import java.io.IOException; +import java.io.PrintWriter; +import java.lang.invoke.MethodHandle; +import java.lang.invoke.MethodHandles; +import java.lang.reflect.Field; +import java.time.LocalDateTime; +import java.time.format.DateTimeFormatter; +import java.util.ArrayList; +import java.util.Collections; +import java.util.List; +import java.util.Locale; +import java.util.Set; +import net.kyori.adventure.text.Component; +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.bukkit.plugin.RegisteredListener; +import org.checkerframework.checker.nullness.qual.NonNull; +import org.checkerframework.framework.qual.DefaultQualifier; + +import static net.kyori.adventure.text.Component.newline; +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; +import static net.kyori.adventure.text.format.NamedTextColor.WHITE; + +@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) { + if (args.length >= 1 && args[0].equals("tofile")) { + this.dumpToFile(sender); + return true; + } + this.doDumpListeners(sender, args); + return true; + } + + private void dumpToFile(final CommandSender sender) { + final File file = new File("debug/listeners-" + + DateTimeFormatter.ofPattern("yyyy-MM-dd_HH.mm.ss").format(LocalDateTime.now()) + ".txt"); + file.getParentFile().mkdirs(); + try (final PrintWriter writer = new PrintWriter(file)) { + for (final String eventClass : eventClassNames()) { + final HandlerList handlers; + try { + handlers = (HandlerList) findClass(eventClass).getMethod("getHandlerList").invoke(null); + } catch (final ReflectiveOperationException e) { + continue; + } + if (handlers.getRegisteredListeners().length != 0) { + writer.println(eventClass); + } + for (final RegisteredListener registeredListener : handlers.getRegisteredListeners()) { + writer.println(" - " + registeredListener); + } + } + } catch (final IOException ex) { + throw new RuntimeException(ex); + } + sender.sendMessage(text("Dumped listeners to " + file, GREEN)); + } + + private void doDumpListeners(final CommandSender sender, final String[] args) { + if (args.length == 0) { + sender.sendMessage(text("Usage: /paper dumplisteners tofile|", 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] + ":")); + + for (final RegisteredListener listener : handlers.getRegisteredListeners()) { + final Component hoverText = text("Priority: " + listener.getPriority().name() + " (" + listener.getPriority().getSlot() + ")", WHITE) + .append(newline()) + .append(text("Listener: " + listener.getListener())) + .append(newline()) + .append(text("Executor: " + listener.getExecutor())) + .append(newline()) + .append(text("Ignoring cancelled: " + listener.isIgnoringCancelled())); + + sender.sendMessage(text(listener.getPlugin().getName(), GREEN) + .append(space()) + .append(text("(" + listener.getListener().getClass().getName() + ")", GRAY).hoverEvent(hoverText))); + } + + 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 tabComplete(final CommandSender sender, final String subCommand, final String[] args) { + return switch (args.length) { + case 0 -> suggestions(); + case 1 -> suggestions().stream() + .filter(clazz -> clazz.toLowerCase(Locale.ROOT).contains(args[0].toLowerCase(Locale.ROOT))) + .toList(); + default -> Collections.emptyList(); + }; + } + + private static List suggestions() { + final List ret = new ArrayList<>(); + ret.add("tofile"); + ret.addAll(eventClassNames()); + return ret; + } + + @SuppressWarnings("unchecked") + private static Set eventClassNames() { + try { + return (Set) 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); + } +}