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Implement packet send/receive events

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This commit is contained in:
KingRainbow44 2022-04-23 02:08:31 -04:00
parent 600decbc09
commit 832c460a83
5 changed files with 80 additions and 15 deletions
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5
src/main/java/emu/grasscutter/server/event/Event.java
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@ -18,9 +18,8 @@ public abstract class Event {
/**
* Cancels the event if possible.
*/
public void cancel() throws IllegalAccessException {
if(!(this instanceof Cancellable))
throw new IllegalAccessException("Event is not cancellable.");
public void cancel() {
if(this instanceof Cancellable)
this.cancelled = true;
}

35
src/main/java/emu/grasscutter/server/event/game/ReceivePacketEvent.java Normal file
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@ -0,0 +1,35 @@
package emu.grasscutter.server.event.game;
import emu.grasscutter.server.event.Cancellable;
import emu.grasscutter.server.event.ServerEvent;
import emu.grasscutter.server.game.GameSession;
public final class ReceivePacketEvent extends ServerEvent implements Cancellable {
private final GameSession gameSession;
private final int packetId;
private byte[] packetData;
public ReceivePacketEvent(GameSession gameSession, int packetId, byte[] packetData) {
super(Type.GAME);
this.gameSession = gameSession;
this.packetId = packetId;
this.packetData = packetData;
}
public GameSession getGameSession() {
return this.gameSession;
}
public int getPacketId() {
return this.packetId;
}
public void setPacketData(byte[] packetData) {
this.packetData = packetData;
}
public byte[] getPacketData() {
return this.packetData;
}
}

30
src/main/java/emu/grasscutter/server/event/game/SendPacketEvent.java Normal file
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@ -0,0 +1,30 @@
package emu.grasscutter.server.event.game;
import emu.grasscutter.net.packet.GenshinPacket;
import emu.grasscutter.server.event.Cancellable;
import emu.grasscutter.server.event.ServerEvent;
import emu.grasscutter.server.game.GameSession;
public final class SendPacketEvent extends ServerEvent implements Cancellable {
private final GameSession gameSession;
private GenshinPacket packet;
public SendPacketEvent(GameSession gameSession, GenshinPacket packet) {
super(Type.GAME);
this.gameSession = gameSession;
this.packet = packet;
}
public GameSession getGameSession() {
return this.gameSession;
}
public void setPacket(GenshinPacket packet) {
this.packet = packet;
}
public GenshinPacket getPacket() {
return this.packet;
}
}

11
src/main/java/emu/grasscutter/server/game/GameServerPacketHandler.java
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@ -2,6 +2,7 @@ package emu.grasscutter.server.game;
import java.util.Set;
import emu.grasscutter.server.event.game.ReceivePacketEvent;
import org.reflections.Reflections;
import emu.grasscutter.Grasscutter;
@ -48,9 +49,7 @@ public class GameServerPacketHandler {
}
public void handle(GameSession session, int opcode, byte[] header, byte[] payload) {
PacketHandler handler = null;
handler = this.handlers.get(opcode);
PacketHandler handler = this.handlers.get(opcode);
if (handler != null) {
try {
@ -77,8 +76,10 @@ public class GameServerPacketHandler {
}
}
// Handle
handler.handle(session, header, payload);
// Invoke event.
ReceivePacketEvent event = new ReceivePacketEvent(session, opcode, payload); event.call();
if(!event.isCanceled()) // If event is not canceled, continue.
handler.handle(session, header, event.getPacketData());
} catch (Exception ex) {
// TODO Remove this when no more needed
ex.printStackTrace();

10
src/main/java/emu/grasscutter/server/game/GameSession.java
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@ -10,6 +10,7 @@ import emu.grasscutter.game.GenshinPlayer;
import emu.grasscutter.net.packet.GenshinPacket;
import emu.grasscutter.net.packet.PacketOpcodesUtil;
import emu.grasscutter.netty.MihoyoKcpChannel;
import emu.grasscutter.server.event.game.SendPacketEvent;
import emu.grasscutter.utils.Crypto;
import emu.grasscutter.utils.FileUtils;
import emu.grasscutter.utils.Utils;
@ -161,16 +162,15 @@ public class GameSession extends MihoyoKcpChannel {
genshinPacket.buildHeader(this.getNextClientSequence());
}
// Build packet
byte[] data = genshinPacket.build();
// Log
if (Grasscutter.getConfig().getGameServerOptions().LOG_PACKETS) {
logPacket(genshinPacket);
}
// Send
send(data);
// Invoke event.
SendPacketEvent event = new SendPacketEvent(this, genshinPacket); event.call();
if(!event.isCanceled()) // If event is not cancelled, continue.
this.send(event.getPacket().build());
}
private void logPacket(int opcode) {