Filter fabric player move events based on previous location

Affects issues:
- Fixed #2324

Plan/fabric/src/main/java/net/playeranalytics/plan/gathering/FabricPlayerPositionTracker.java

@@ -0,0 +1,82 @@
+/*
+ *  This file is part of Player Analytics (Plan).
+ *
+ *  Plan is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU Lesser General Public License v3 as published by
+ *  the Free Software Foundation, either version 3 of the License, or
+ *  (at your option) any later version.
+ *
+ *  Plan is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU Lesser General Public License for more details.
+ *
+ *  You should have received a copy of the GNU Lesser General Public License
+ *  along with Plan. If not, see <https://www.gnu.org/licenses/>.
+ */
+package net.playeranalytics.plan.gathering;
+
+import java.util.HashMap;
+import java.util.Map;
+import java.util.UUID;
+import java.util.concurrent.locks.ReentrantLock;
+
+public class FabricPlayerPositionTracker {
+    private static final ReentrantLock WRITE_LOCK = new ReentrantLock();
+    private static final Map<UUID, double[]> POSITIONS = new HashMap<>();
+
+    private static final double[] EMPTY_POSITION = new double[5];
+
+    public FabricPlayerPositionTracker() {
+        // Static method class
+    }
+
+    public static void removePlayer(UUID playerUUID) {
+        try {
+            WRITE_LOCK.lock();
+            POSITIONS.remove(playerUUID);
+        } finally {
+            WRITE_LOCK.unlock();
+        }
+    }
+
+    public static double[] getPosition(UUID playerUUID) {
+        return POSITIONS.getOrDefault(playerUUID, EMPTY_POSITION);
+    }
+
+    public static boolean moved(UUID playerUUID, double x, double y, double z, float yaw, float pitch) {
+        double[] previous = POSITIONS.get(playerUUID);
+        if (isDifferent(previous, x, y, z, yaw, pitch)) {
+            writeNewPosition(playerUUID, x, y, z, yaw, pitch, previous);
+            return true;
+        }
+        return false;
+    }
+
+    private static void writeNewPosition(UUID playerUUID, double x, double y, double z, float yaw, float pitch, double[] previous) {
+        try {
+            WRITE_LOCK.lock();
+            if (previous == null) {
+                previous = new double[5];
+                POSITIONS.put(playerUUID, previous);
+            }
+            previous[0] = x;
+            previous[1] = y;
+            previous[2] = z;
+            previous[3] = yaw;
+            previous[4] = pitch;
+
+        } finally {
+            WRITE_LOCK.unlock();
+        }
+    }
+
+    private static boolean isDifferent(double[] previous, double x, double y, double z, float yaw, float pitch) {
+        return previous == null
+                || Double.compare(previous[0], x) != 0
+                || Double.compare(previous[1], y) != 0
+                || Double.compare(previous[2], z) != 0
+                || Double.compare(previous[3], yaw) != 0
+                || Double.compare(previous[4], pitch) != 0;
+    }
+}

Plan/fabric/src/main/java/net/playeranalytics/plan/gathering/listeners/events/PlanFabricEvents.java

@@ -28,9 +28,11 @@ import net.minecraft.server.network.ServerPlayerEntity;
 import net.minecraft.text.Text;
 import net.minecraft.world.GameMode;
 import net.playeranalytics.plan.PlanFabric;
+import net.playeranalytics.plan.gathering.FabricPlayerPositionTracker;
 
 import java.net.SocketAddress;
 import java.util.Collection;
+import java.util.UUID;
 
 public class PlanFabricEvents {
 
@@ -48,7 +50,16 @@ public class PlanFabricEvents {
 
     public static final Event<OnMove> ON_MOVE = EventFactory.createArrayBacked(OnMove.class, callbacks -> (handler, packet) -> {
         for (OnMove callback : callbacks) {
-            callback.onMove(handler, packet);
+            UUID playerUUID = handler.player.getUuid();
+            double[] position = FabricPlayerPositionTracker.getPosition(playerUUID);
+            double x = position[0];
+            double y = position[1];
+            double z = position[2];
+            float yaw = (float) position[3];
+            float pitch = (float) position[4];
+            if (FabricPlayerPositionTracker.moved(playerUUID, packet.getX(x), packet.getY(y), packet.getZ(z), packet.getYaw(yaw), packet.getPitch(pitch))) {
+                callback.onMove(handler, packet);
+            }
         }
     });
 

Plan/fabric/src/main/java/net/playeranalytics/plan/gathering/listeners/fabric/PlayerOnlineListener.java

@@ -42,6 +42,7 @@ import com.mojang.authlib.GameProfile;
 import net.fabricmc.fabric.api.networking.v1.ServerPlayConnectionEvents;
 import net.minecraft.server.dedicated.MinecraftDedicatedServer;
 import net.minecraft.server.network.ServerPlayerEntity;
+import net.playeranalytics.plan.gathering.FabricPlayerPositionTracker;
 import net.playeranalytics.plan.gathering.listeners.FabricListener;
 import net.playeranalytics.plan.gathering.listeners.events.PlanFabricEvents;
 
@@ -234,6 +235,7 @@ public class PlayerOnlineListener implements FabricListener {
         beforePlayerQuit(player);
         try {
             actOnQuitEvent(player);
+            FabricPlayerPositionTracker.removePlayer(player.getUuid());
         } catch (Exception e) {
             errorLogger.error(e, ErrorContext.builder().related(getClass(), player).build());
         }