forked from BLOCKFANTASY/LOOHP-Limbo
132 lines
4.1 KiB
Java
132 lines
4.1 KiB
Java
/*
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* This file is part of Limbo.
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*
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* Copyright (C) 2022. LoohpJames <jamesloohp@gmail.com>
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* Copyright (C) 2022. Contributors
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.loohp.limbo.network;
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import com.loohp.limbo.network.protocol.packets.PacketIn;
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import com.loohp.limbo.network.protocol.packets.PacketOut;
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import com.loohp.limbo.utils.DataTypeIO;
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import com.loohp.limbo.utils.Pair;
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import net.kyori.adventure.key.Key;
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import java.io.DataInputStream;
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import java.io.DataOutputStream;
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import java.io.IOException;
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import java.util.List;
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import java.util.concurrent.CopyOnWriteArrayList;
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import java.util.concurrent.atomic.AtomicBoolean;
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public class Channel implements AutoCloseable {
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private final ClientConnection client;
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private final List<Pair<Key, ChannelPacketHandler>> handlers;
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private final AtomicBoolean valid;
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protected final DataInputStream input;
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protected final DataOutputStream output;
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public Channel(ClientConnection client, DataInputStream input, DataOutputStream output) {
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this.client = client;
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this.input = input;
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this.output = output;
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this.handlers = new CopyOnWriteArrayList<>();
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this.valid = new AtomicBoolean(true);
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}
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private void ensureOpen() {
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if (!valid.get()) {
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close();
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}
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}
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public void addHandlerBefore(Key key, ChannelPacketHandler handler) {
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handlers.add(0, new Pair<>(key, handler));
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}
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public void addHandlerAfter(Key key, ChannelPacketHandler handler) {
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handlers.add(new Pair<>(key, handler));
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}
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public void removeHandler(Key key) {
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handlers.removeIf(each -> each.getFirst().equals(key));
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}
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protected PacketIn readPacket() throws Exception {
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return readPacket(-1);
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}
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protected PacketIn readPacket(int size) throws IOException {
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PacketIn packet = null;
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do {
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ensureOpen();
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size = size < 0 ? DataTypeIO.readVarInt(input) : size;
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int packetId = DataTypeIO.readVarInt(input);
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ChannelPacketRead read = new ChannelPacketRead(size, packetId, input);
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for (Pair<Key, ChannelPacketHandler> pair : handlers) {
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read = pair.getSecond().read(read);
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if (read == null) {
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packet = null;
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break;
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}
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packet = read.getReadPacket();
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}
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size = -1;
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} while (packet == null);
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return packet;
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}
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protected boolean writePacket(PacketOut packet) throws IOException {
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if (client.getClientState() == ClientConnection.ClientState.DISCONNECTED) {
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return false;
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}
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ensureOpen();
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if (packet.getPacketState() != client.getClientState()) {
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return false;
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}
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ChannelPacketWrite write = new ChannelPacketWrite(packet);
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for (Pair<Key, ChannelPacketHandler> pair : handlers) {
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write = pair.getSecond().write(write);
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if (write == null) {
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return false;
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}
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}
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packet = write.getPacket();
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byte[] packetByte = packet.serializePacket();
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writePacketRaw(packetByte);
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return true;
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}
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public void writePacketRaw(byte[] packetByte) throws IOException {
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DataTypeIO.writeVarInt(output, packetByte.length);
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output.write(packetByte);
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output.flush();
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}
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@Override
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public synchronized void close() {
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if (valid.compareAndSet(true, false)) {
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try {
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input.close();
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output.close();
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} catch (Exception ignore) {
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}
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}
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}
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}
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