mirror of https://github.com/GeyserMC/Geyser.git
76 lines
3.3 KiB
Java
76 lines
3.3 KiB
Java
/*
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* Copyright (c) 2019-2022 GeyserMC. http://geysermc.org
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*
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* @author GeyserMC
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* @link https://github.com/GeyserMC/Geyser
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*/
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package org.geysermc.geyser.translator.protocol.java;
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import com.github.steveice10.mc.protocol.packet.common.clientbound.ClientboundKeepAlivePacket;
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import org.cloudburstmc.protocol.bedrock.packet.NetworkStackLatencyPacket;
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import org.geysermc.geyser.session.GeyserSession;
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import org.geysermc.geyser.translator.protocol.PacketTranslator;
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import org.geysermc.geyser.translator.protocol.Translator;
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/**
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* Used to forward the keep alive packet to the client in order to get back a reliable ping.
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*/
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@Translator(packet = ClientboundKeepAlivePacket.class)
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public class JavaKeepAliveTranslator extends PacketTranslator<ClientboundKeepAlivePacket> {
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@Override
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public void translate(GeyserSession session, ClientboundKeepAlivePacket packet) {
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if (!session.getGeyser().getConfig().isForwardPlayerPing()) {
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return;
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}
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// We use this once the client replies (see BedrockNetworkStackLatencyTranslator)
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session.getKeepAliveCache().add(packet.getPingId());
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long timestamp = packet.getPingId();
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// We take the abs because we rely on the client responding with a negative value ONLY when we send
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// a negative timestamp in the form-image-hack performed in FormCache.
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// Apart from that case, we don't actually use the value the client responds with, instead using our keep alive cache.
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if (timestamp == Long.MIN_VALUE) {
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timestamp = Long.MAX_VALUE; // There is not an abs representation of MIN_VALUE (2's complement)
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} else {
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timestamp = Math.absExact(timestamp);
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}
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// Bedrock will overflow on timestamps that are too large, and respond with a mangled negative value.
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// Keeping leftmost digits allows for easier debugging
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while (timestamp > 1e10) {
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timestamp /= 10;
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}
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NetworkStackLatencyPacket latencyPacket = new NetworkStackLatencyPacket();
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latencyPacket.setFromServer(true);
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latencyPacket.setTimestamp(timestamp);
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session.sendUpstreamPacketImmediately(latencyPacket);
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}
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@Override
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public boolean shouldExecuteInEventLoop() {
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return false;
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}
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}
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