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preliminary cleanup of plugin message channel handling

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This commit is contained in:
Shane Freeder
2025-04-06 20:17:28 +01:00
parent aae97dce3d
commit 676ec9cb21
5 changed files with 67 additions and 33 deletions
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11
proxy/src/main/java/com/velocitypowered/proxy/connection/backend/BungeeCordMessageResponder.java
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@@ -20,6 +20,7 @@ package com.velocitypowered.proxy.connection.backend;
import com.velocitypowered.api.network.ProtocolVersion;
import com.velocitypowered.api.proxy.Player;
import com.velocitypowered.api.proxy.ServerConnection;
import com.velocitypowered.api.proxy.messages.ChannelIdentifier;
import com.velocitypowered.api.proxy.messages.LegacyChannelIdentifier;
import com.velocitypowered.api.proxy.messages.MinecraftChannelIdentifier;
import com.velocitypowered.api.proxy.server.RegisteredServer;
@@ -316,9 +317,9 @@ public class BungeeCordMessageResponder {
});
}
static String getBungeeCordChannel(ProtocolVersion version) {
return version.noLessThan(ProtocolVersion.MINECRAFT_1_13) ? MODERN_CHANNEL.getId()
: LEGACY_CHANNEL.getId();
static ChannelIdentifier getBungeeCordChannel(ProtocolVersion version) {
return version.noLessThan(ProtocolVersion.MINECRAFT_1_13) ? MODERN_CHANNEL
: LEGACY_CHANNEL;
}
// Note: this method will always release the buffer!
@@ -329,8 +330,8 @@ public class BungeeCordMessageResponder {
// Note: this method will always release the buffer!
private static void sendServerResponse(ConnectedPlayer player, ByteBuf buf) {
MinecraftConnection serverConnection = player.ensureAndGetCurrentServer().ensureConnected();
String chan = getBungeeCordChannel(serverConnection.getProtocolVersion());
PluginMessagePacket msg = new PluginMessagePacket(chan, buf);
ChannelIdentifier chan = getBungeeCordChannel(serverConnection.getProtocolVersion());
PluginMessagePacket msg = new PluginMessagePacket(chan.getId(), buf);
serverConnection.write(msg);
}

18
proxy/src/main/java/com/velocitypowered/proxy/connection/client/ClientPlaySessionHandler.java
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@@ -162,7 +162,7 @@ public class ClientPlaySessionHandler implements MinecraftSessionHandler {
@Override
public void activated() {
configSwitchFuture = new CompletableFuture<>();
Collection<String> channels =
Collection<ChannelIdentifier> channels =
server.getChannelRegistrar().getChannelsForProtocol(player.getProtocolVersion());
if (!channels.isEmpty()) {
PluginMessagePacket register = constructChannelsPacket(player.getProtocolVersion(), channels);
@@ -310,22 +310,14 @@ public class ClientPlaySessionHandler implements MinecraftSessionHandler {
logger.warn("A plugin message was received while the backend server was not "
+ "ready. Channel: {}. Packet discarded.", packet.getChannel());
} else if (PluginMessageUtil.isRegister(packet)) {
List<String> channels = PluginMessageUtil.getChannels(packet);
List<ChannelIdentifier> channels = PluginMessageUtil.getChannels(packet, this.player.getProtocolVersion());
player.getClientsideChannels().addAll(channels);
List<ChannelIdentifier> channelIdentifiers = new ArrayList<>();
for (String channel : channels) {
try {
channelIdentifiers.add(MinecraftChannelIdentifier.from(channel));
} catch (IllegalArgumentException e) {
channelIdentifiers.add(new LegacyChannelIdentifier(channel));
}
}
server.getEventManager()
.fireAndForget(
new PlayerChannelRegisterEvent(player, ImmutableList.copyOf(channelIdentifiers)));
new PlayerChannelRegisterEvent(player, ImmutableList.copyOf(channels)));
backendConn.write(packet.retain());
} else if (PluginMessageUtil.isUnregister(packet)) {
player.getClientsideChannels().removeAll(PluginMessageUtil.getChannels(packet));
player.getClientsideChannels().removeAll(PluginMessageUtil.getChannels(packet, this.player.getProtocolVersion()));
backendConn.write(packet.retain());
} else if (PluginMessageUtil.isMcBrand(packet)) {
String brand = PluginMessageUtil.readBrandMessage(packet.content());
@@ -589,7 +581,7 @@ public class ClientPlaySessionHandler implements MinecraftSessionHandler {
// Tell the server about the proxy's plugin message channels.
ProtocolVersion serverVersion = serverMc.getProtocolVersion();
final Collection<String> channels = server.getChannelRegistrar()
final Collection<ChannelIdentifier> channels = server.getChannelRegistrar()
.getChannelsForProtocol(serverMc.getProtocolVersion());
if (!channels.isEmpty()) {
serverMc.delayedWrite(constructChannelsPacket(serverVersion, channels));

4
proxy/src/main/java/com/velocitypowered/proxy/connection/client/ConnectedPlayer.java
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@@ -175,7 +175,7 @@ public class ConnectedPlayer implements MinecraftConnectionAssociation, Player,
private final InternalTabList tabList;
private final VelocityServer server;
private ClientConnectionPhase connectionPhase;
private final Collection<String> clientsideChannels;
private final Collection<ChannelIdentifier> clientsideChannels;
private final CompletableFuture<Void> teardownFuture = new CompletableFuture<>();
private @MonotonicNonNull List<String> serversToTry = null;
private final ResourcePackHandler resourcePackHandler;
@@ -1351,7 +1351,7 @@ public class ConnectedPlayer implements MinecraftConnectionAssociation, Player,
*
* @return the channels
*/
public Collection<String> getClientsideChannels() {
public Collection<ChannelIdentifier> getClientsideChannels() {
return clientsideChannels;
}

51
proxy/src/main/java/com/velocitypowered/proxy/protocol/util/PluginMessageUtil.java
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@@ -22,13 +22,20 @@ import static com.google.common.base.Preconditions.checkNotNull;
import com.google.common.collect.ImmutableList;
import com.velocitypowered.api.network.ProtocolVersion;
import com.velocitypowered.api.proxy.messages.ChannelIdentifier;
import com.velocitypowered.api.proxy.messages.LegacyChannelIdentifier;
import com.velocitypowered.api.proxy.messages.MinecraftChannelIdentifier;
import com.velocitypowered.api.util.ProxyVersion;
import com.velocitypowered.proxy.protocol.ProtocolUtils;
import com.velocitypowered.proxy.protocol.netty.MinecraftDecoder;
import com.velocitypowered.proxy.protocol.packet.PluginMessagePacket;
import com.velocitypowered.proxy.util.except.QuietDecoderException;
import io.netty.buffer.ByteBuf;
import io.netty.buffer.Unpooled;
import java.nio.charset.StandardCharsets;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Iterator;
import java.util.List;
import java.util.Locale;
import java.util.regex.Pattern;
@@ -85,13 +92,15 @@ public final class PluginMessageUtil {
.equals(UNREGISTER_CHANNEL);
}
private static final QuietDecoderException ILLEGAL_CHANNEL = new QuietDecoderException("Illegal channel");
/**
* Fetches all the channels in a register or unregister plugin message.
*
* @param message the message to get the channels from
* @return the channels, as an immutable list
*/
public static List<String> getChannels(PluginMessagePacket message) {
public static List<ChannelIdentifier> getChannels(PluginMessagePacket message,
ProtocolVersion protocolVersion) {
checkNotNull(message, "message");
checkArgument(isRegister(message) || isUnregister(message), "Unknown channel type %s",
message.getChannel());
@@ -100,8 +109,25 @@ public final class PluginMessageUtil {
// has caused issues with 1.13+ compatibility. Just return an empty list.
return ImmutableList.of();
}
String channels = message.content().toString(StandardCharsets.UTF_8);
return ImmutableList.copyOf(channels.split("\0"));
String payload = message.content().toString(StandardCharsets.UTF_8);
String[] channels = payload.split("\0");
List<ChannelIdentifier> channelIdentifiers = new ArrayList<>();
try {
for (String channel : channels) {
if (protocolVersion.noLessThan(ProtocolVersion.MINECRAFT_1_13)) {
channelIdentifiers.add(MinecraftChannelIdentifier.from(channel));
} else {
channelIdentifiers.add(new LegacyChannelIdentifier(channel));
}
}
} catch (IllegalArgumentException e) {
if (MinecraftDecoder.DEBUG) {
throw e;
} else {
throw ILLEGAL_CHANNEL;
}
}
return ImmutableList.copyOf(channelIdentifiers);
}
/**
@@ -112,16 +138,31 @@ public final class PluginMessageUtil {
* @return the plugin message to send
*/
public static PluginMessagePacket constructChannelsPacket(ProtocolVersion protocolVersion,
Collection<String> channels) {
Collection<ChannelIdentifier> channels) {
checkNotNull(channels, "channels");
checkArgument(!channels.isEmpty(), "no channels specified");
String channelName = protocolVersion.noLessThan(ProtocolVersion.MINECRAFT_1_13)
? REGISTER_CHANNEL : REGISTER_CHANNEL_LEGACY;
ByteBuf contents = Unpooled.buffer();
contents.writeCharSequence(String.join("\0", channels), StandardCharsets.UTF_8);
contents.writeCharSequence(joinChannels(channels), StandardCharsets.UTF_8);
return new PluginMessagePacket(channelName, contents);
}
private static String joinChannels(Collection<ChannelIdentifier> channels) {
checkNotNull(channels, "channels");
checkArgument(!channels.isEmpty(), "no channels specified");
StringBuilder sb = new StringBuilder();
Iterator<ChannelIdentifier> iterator = channels.iterator();
while (iterator.hasNext()) {
ChannelIdentifier channel = iterator.next();
sb.append(channel.getId());
if (iterator.hasNext()) {
sb.append('\0');
}
}
return sb.toString();
}
/**
* Rewrites the brand message to indicate the presence of Velocity.
*

16
proxy/src/main/java/com/velocitypowered/proxy/util/VelocityChannelRegistrar.java
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@@ -79,10 +79,10 @@ public class VelocityChannelRegistrar implements ChannelRegistrar {
*
* @return all legacy channel IDs
*/
public Collection<String> getLegacyChannelIds() {
Collection<String> ids = new HashSet<>();
public Collection<ChannelIdentifier> getLegacyChannelIds() {
Collection<ChannelIdentifier> ids = new HashSet<>();
for (ChannelIdentifier value : identifierMap.values()) {
ids.add(value.getId());
ids.add(new LegacyChannelIdentifier(value.getId()));
}
return ids;
}
@@ -92,13 +92,13 @@ public class VelocityChannelRegistrar implements ChannelRegistrar {
*
* @return the channel IDs for Minecraft 1.13 and above
*/
public Collection<String> getModernChannelIds() {
Collection<String> ids = new HashSet<>();
public Collection<ChannelIdentifier> getModernChannelIds() {
Collection<ChannelIdentifier> ids = new HashSet<>();
for (ChannelIdentifier value : identifierMap.values()) {
if (value instanceof MinecraftChannelIdentifier) {
ids.add(value.getId());
ids.add(value);
} else {
ids.add(PluginMessageUtil.transformLegacyToModernChannel(value.getId()));
ids.add(MinecraftChannelIdentifier.from(PluginMessageUtil.transformLegacyToModernChannel(value.getId())));
}
}
return ids;
@@ -114,7 +114,7 @@ public class VelocityChannelRegistrar implements ChannelRegistrar {
* @param protocolVersion the protocol version in use
* @return the list of channels to register
*/
public Collection<String> getChannelsForProtocol(ProtocolVersion protocolVersion) {
public Collection<ChannelIdentifier> getChannelsForProtocol(ProtocolVersion protocolVersion) {
if (protocolVersion.noLessThan(ProtocolVersion.MINECRAFT_1_13)) {
return getModernChannelIds();
}