Add a /geyser ping command

api/src/main/java/org/geysermc/geyser/api/connection/GeyserConnection.java

@@ -95,4 +95,9 @@ public interface GeyserConnection extends Connection, CommandSource {
      */
     @NonNull
     Set<String> fogEffects();
+
+    /**
+     * Returns the current ping of the connection.
+     */
+    int ping();
 }

core/src/main/java/org/geysermc/geyser/command/GeyserCommandManager.java

@@ -44,6 +44,7 @@
 import org.geysermc.geyser.command.defaults.HelpCommand;
 import org.geysermc.geyser.command.defaults.ListCommand;
 import org.geysermc.geyser.command.defaults.OffhandCommand;
+import org.geysermc.geyser.command.defaults.PingCommand;
 import org.geysermc.geyser.command.defaults.ReloadCommand;
 import org.geysermc.geyser.command.defaults.SettingsCommand;
 import org.geysermc.geyser.command.defaults.StatisticsCommand;
@@ -66,7 +67,7 @@
 public class GeyserCommandManager {
 
     @Getter
-    private final Map<String, Command> commands = new Object2ObjectOpenHashMap<>(12);
+    private final Map<String, Command> commands = new Object2ObjectOpenHashMap<>(13);
     private final Map<Extension, Map<String, Command>> extensionCommands = new Object2ObjectOpenHashMap<>(0);
 
     private final GeyserImpl geyser;
@@ -83,6 +84,7 @@ public void init() {
         registerBuiltInCommand(new AdvancementsCommand("advancements", "geyser.commands.advancements.desc", "geyser.command.advancements"));
         registerBuiltInCommand(new AdvancedTooltipsCommand("tooltips", "geyser.commands.advancedtooltips.desc", "geyser.command.tooltips"));
         registerBuiltInCommand(new ConnectionTestCommand(geyser, "connectiontest", "geyser.commands.connectiontest.desc", "geyser.command.connectiontest"));
+        registerBuiltInCommand(new PingCommand("ping", "geyser.commands.ping.desc", "geyser.command.ping"));
         if (this.geyser.getPlatformType() == PlatformType.STANDALONE) {
             registerBuiltInCommand(new StopCommand(geyser, "stop", "geyser.commands.stop.desc", "geyser.command.stop"));
         }

core/src/main/java/org/geysermc/geyser/command/defaults/PingCommand.java

@@ -0,0 +1,54 @@
+/*
+ * Copyright (c) 2019-2023 GeyserMC. http://geysermc.org
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ *
+ * @author GeyserMC
+ * @link https://github.com/GeyserMC/Geyser
+ */
+
+package org.geysermc.geyser.command.defaults;
+
+import org.geysermc.geyser.command.GeyserCommand;
+import org.geysermc.geyser.command.GeyserCommandSource;
+import org.geysermc.geyser.session.GeyserSession;
+import org.geysermc.geyser.text.GeyserLocale;
+
+public class PingCommand extends GeyserCommand {
+    public PingCommand(String name, String description, String permission) {
+        super(name, description, permission);
+    }
+
+    @Override
+    public void execute(GeyserSession session, GeyserCommandSource sender, String[] args) {
+        if (session == null) return;
+        sender.sendMessage(GeyserLocale.getPlayerLocaleString("geyser.commands.ping.message", sender.locale(), session.ping()));
+    }
+
+    @Override
+    public boolean isBedrockOnly() {
+        return true;
+    }
+
+    @Override
+    public boolean isExecutableOnConsole() {
+        return false;
+    }
+}
+

core/src/main/java/org/geysermc/geyser/session/GeyserSession.java

@@ -85,6 +85,8 @@
 import org.checkerframework.common.value.qual.IntRange;
 import org.cloudburstmc.math.vector.*;
 import org.cloudburstmc.nbt.NbtMap;
+import org.cloudburstmc.netty.channel.raknet.RakChildChannel;
+import org.cloudburstmc.netty.handler.codec.raknet.common.RakSessionCodec;
 import org.cloudburstmc.protocol.bedrock.BedrockDisconnectReasons;
 import org.cloudburstmc.protocol.bedrock.BedrockServerSession;
 import org.cloudburstmc.protocol.bedrock.data.*;
@@ -2032,6 +2034,12 @@ public void removeFog(String... fogNameSpaces) {
         return Set.copyOf(this.appliedFog);
     }
 
+    @Override
+    public int ping() {
+        RakSessionCodec rakSessionCodec = ((RakChildChannel) getUpstream().getSession().getPeer().getChannel()).rakPipeline().get(RakSessionCodec.class);
+        return (int) Math.floor(rakSessionCodec.getPing());
+    }
+
     public void addCommandEnum(String name, String enums) {
         softEnumPacket(name, SoftEnumUpdateType.ADD, enums);
     }