Geyser/core/src/main/java/org/geysermc/geyser/network/netty/Bootstraps.java

125 lines
4.6 KiB
Java

/*
* Copyright (c) 2019-2023 GeyserMC. http://geysermc.org
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*
* @author GeyserMC
* @link https://github.com/GeyserMC/Geyser
*/
package org.geysermc.geyser.network.netty;
import io.netty.bootstrap.AbstractBootstrap;
import io.netty.channel.Channel;
import io.netty.channel.ChannelFuture;
import io.netty.channel.epoll.Native;
import io.netty.channel.unix.UnixChannelOption;
import lombok.experimental.UtilityClass;
import org.geysermc.geyser.GeyserImpl;
import java.util.concurrent.CompletableFuture;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
@UtilityClass
public final class Bootstraps {
// The REUSEPORT_AVAILABLE socket option is available starting from kernel version 3.9.
// This option allows multiple sockets to listen on the same IP address and port without conflict.
private static final int[] REUSEPORT_VERSION = new int[]{3, 9};
private static final boolean REUSEPORT_AVAILABLE;
static {
String kernelVersion;
try {
kernelVersion = Native.KERNEL_VERSION;
} catch (Throwable e) {
GeyserImpl.getInstance().getLogger().debug("Could not determine kernel version! " + e.getMessage());
kernelVersion = null;
}
if (kernelVersion == null) {
REUSEPORT_AVAILABLE = false;
} else {
int[] kernelVer = fromString(kernelVersion);
REUSEPORT_AVAILABLE = checkVersion(kernelVer, 0);
}
}
public static boolean isReusePortAvailable() {
return REUSEPORT_AVAILABLE;
}
@SuppressWarnings({"rawtypes, unchecked"})
public static void setupBootstrap(AbstractBootstrap bootstrap) {
if (REUSEPORT_AVAILABLE) {
bootstrap.option(UnixChannelOption.SO_REUSEPORT, true);
}
}
private static int[] fromString(String input) {
// Match only beginning of string for at least two digits separated by dot
Pattern pattern = Pattern.compile("^(\\d+)\\.(\\d+)");
Matcher matcher = pattern.matcher(input);
int[] version = {0, 0};
if (matcher.find()) {
version[0] = Integer.parseInt(matcher.group(1));
version[1] = Integer.parseInt(matcher.group(2));
}
return version;
}
private static boolean checkVersion(int[] ver, int i) {
if (ver[i] > REUSEPORT_VERSION[i]) {
return true;
} else if (ver[i] == REUSEPORT_VERSION[i]) {
if (ver.length == (i + 1)) {
return true;
} else {
return checkVersion(ver, i + 1);
}
}
return false;
}
public static CompletableFuture<Void> allOf(ChannelFuture... futures) {
if (futures == null || futures.length == 0) {
return CompletableFuture.completedFuture(null);
}
@SuppressWarnings("unchecked")
CompletableFuture<Channel>[] completableFutures = new CompletableFuture[futures.length];
for (int i = 0; i < futures.length; i++) {
ChannelFuture channelFuture = futures[i];
CompletableFuture<Channel> completableFuture = new CompletableFuture<>();
channelFuture.addListener(future -> {
if (future.cause() != null) {
completableFuture.completeExceptionally(future.cause());
}
completableFuture.complete(channelFuture.channel());
});
completableFutures[i] = completableFuture;
}
return CompletableFuture.allOf(completableFutures);
}
}