97 lines
3.4 KiB
Java
97 lines
3.4 KiB
Java
/*
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* This file is part of ViaLoader - https://github.com/RaphiMC/ViaLoader
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* Copyright (C) 2020-2024 RK_01/RaphiMC and contributors
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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package net.raphimc.vialoader.netty;
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import com.viaversion.viaversion.api.connection.UserConnection;
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import com.viaversion.viaversion.exception.CancelCodecException;
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import com.viaversion.viaversion.exception.CancelDecoderException;
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import com.viaversion.viaversion.exception.CancelEncoderException;
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import com.viaversion.viaversion.util.PipelineUtil;
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import io.netty.buffer.ByteBuf;
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import io.netty.channel.ChannelHandlerContext;
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import io.netty.channel.ChannelPromise;
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import io.netty.handler.codec.ByteToMessageCodec;
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import java.util.List;
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public class ViaCodec extends ByteToMessageCodec<ByteBuf> {
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protected final UserConnection user;
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public ViaCodec(final UserConnection user) {
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this.user = user;
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}
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@Override
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protected void encode(ChannelHandlerContext ctx, ByteBuf in, ByteBuf out) throws Exception {
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if (!this.user.checkOutgoingPacket()) throw CancelEncoderException.generate(null);
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out.writeBytes(in);
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if (this.user.shouldTransformPacket()) {
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this.user.transformOutgoing(out, CancelEncoderException::generate);
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}
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}
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@Override
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protected void decode(ChannelHandlerContext ctx, ByteBuf in, List<Object> out) throws Exception {
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if (!this.user.checkIncomingPacket()) throw CancelDecoderException.generate(null);
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final ByteBuf transformedBuf = ctx.alloc().buffer().writeBytes(in);
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try {
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if (this.user.shouldTransformPacket()) {
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this.user.transformIncoming(transformedBuf, CancelDecoderException::generate);
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}
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out.add(transformedBuf.retain());
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} finally {
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transformedBuf.release();
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}
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}
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@Override
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public void write(ChannelHandlerContext ctx, Object msg, ChannelPromise promise) throws Exception {
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try {
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super.write(ctx, msg, promise);
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} catch (Throwable e) {
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if (!PipelineUtil.containsCause(e, CancelCodecException.class)) {
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throw e;
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} else {
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promise.setSuccess();
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}
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}
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}
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@Override
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public void channelRead(ChannelHandlerContext ctx, Object msg) throws Exception {
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try {
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super.channelRead(ctx, msg);
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} catch (Throwable e) {
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if (!PipelineUtil.containsCause(e, CancelCodecException.class)) {
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throw e;
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}
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}
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}
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@Override
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public boolean isSharable() {
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// Netty doesn't allow codecs to be shared, but we need it to be shared because of the pipeline reordering.
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// The check if it is sharable is done in the constructor and can be bypassed by returning false during that check.
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return this.user != null;
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}
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}
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