From 1d0acbac75c9eea61b6fe5bb01c07a32bb8aca63 Mon Sep 17 00:00:00 2001 From: siloneco Date: Tue, 22 Mar 2022 19:00:36 +0900 Subject: [PATCH] :tada: Initial commit --- .gitignore | 112 +++ LICENSE | 674 ++++++++++++++++++ pom.xml | 102 +++ renovate.json | 6 + src/main/java/net/azisaba/kuvel/Kuvel.java | 147 ++++ .../azisaba/kuvel/KuvelServiceHandler.java | 214 ++++++ .../net/azisaba/kuvel/config/KuvelConfig.java | 58 ++ .../kuvel/config/VelocityConfigLoader.java | 179 +++++ .../discovery/LoadBalancerDiscovery.java | 10 + .../kuvel/discovery/ServerDiscovery.java | 14 + .../impl/RedisLoadBalancerDiscovery.java | 215 ++++++ .../discovery/impl/RedisServerDiscovery.java | 256 +++++++ .../impl/SimpleLoadBalancerDiscovery.java | 129 ++++ .../discovery/impl/SimpleServerDiscovery.java | 153 ++++ .../kuvel/listener/LoadBalancerListener.java | 59 ++ .../kuvel/loadbalancer/LoadBalancer.java | 57 ++ .../loadbalancer/LoadBalancingStrategy.java | 11 + .../VirtualLoadBalancerContainer.java | 13 + .../MinimumPlayerLoadBalancingStrategy.java | 54 ++ .../impl/RoundRobinLoadBalancingStrategy.java | 34 + .../azisaba/kuvel/redis/ProxyIdProvider.java | 59 ++ .../kuvel/redis/RedisConnectionLeader.java | 95 +++ .../net/azisaba/kuvel/redis/RedisKeys.java | 29 + .../azisaba/kuvel/redis/RedisSubscriber.java | 100 +++ .../net/azisaba/kuvel/util/LabelKeys.java | 18 + .../kuvel/util/RedisConnectionData.java | 51 ++ .../kuvel/util/UidAndServerNameMap.java | 34 + src/main/resources/config.yml | 11 + 28 files changed, 2894 insertions(+) create mode 100644 .gitignore create mode 100644 LICENSE create mode 100644 pom.xml create mode 100644 renovate.json create mode 100644 src/main/java/net/azisaba/kuvel/Kuvel.java create mode 100644 src/main/java/net/azisaba/kuvel/KuvelServiceHandler.java create mode 100644 src/main/java/net/azisaba/kuvel/config/KuvelConfig.java create mode 100644 src/main/java/net/azisaba/kuvel/config/VelocityConfigLoader.java create mode 100644 src/main/java/net/azisaba/kuvel/discovery/LoadBalancerDiscovery.java create mode 100644 src/main/java/net/azisaba/kuvel/discovery/ServerDiscovery.java create mode 100644 src/main/java/net/azisaba/kuvel/discovery/impl/RedisLoadBalancerDiscovery.java create mode 100644 src/main/java/net/azisaba/kuvel/discovery/impl/RedisServerDiscovery.java create mode 100644 src/main/java/net/azisaba/kuvel/discovery/impl/SimpleLoadBalancerDiscovery.java create mode 100644 src/main/java/net/azisaba/kuvel/discovery/impl/SimpleServerDiscovery.java create mode 100644 src/main/java/net/azisaba/kuvel/listener/LoadBalancerListener.java create mode 100644 src/main/java/net/azisaba/kuvel/loadbalancer/LoadBalancer.java create mode 100644 src/main/java/net/azisaba/kuvel/loadbalancer/LoadBalancingStrategy.java create mode 100644 src/main/java/net/azisaba/kuvel/loadbalancer/VirtualLoadBalancerContainer.java create mode 100644 src/main/java/net/azisaba/kuvel/loadbalancer/strategy/impl/MinimumPlayerLoadBalancingStrategy.java create mode 100644 src/main/java/net/azisaba/kuvel/loadbalancer/strategy/impl/RoundRobinLoadBalancingStrategy.java create mode 100644 src/main/java/net/azisaba/kuvel/redis/ProxyIdProvider.java create mode 100644 src/main/java/net/azisaba/kuvel/redis/RedisConnectionLeader.java create mode 100644 src/main/java/net/azisaba/kuvel/redis/RedisKeys.java create mode 100644 src/main/java/net/azisaba/kuvel/redis/RedisSubscriber.java create mode 100644 src/main/java/net/azisaba/kuvel/util/LabelKeys.java create mode 100644 src/main/java/net/azisaba/kuvel/util/RedisConnectionData.java create mode 100644 src/main/java/net/azisaba/kuvel/util/UidAndServerNameMap.java create mode 100644 src/main/resources/config.yml diff --git a/.gitignore b/.gitignore new file mode 100644 index 00000000..39c68bf9 --- /dev/null +++ b/.gitignore @@ -0,0 +1,112 @@ + +# Created by https://www.toptal.com/developers/gitignore/api/maven,intellij+all +# Edit at https://www.toptal.com/developers/gitignore?templates=maven,intellij+all + +### Intellij+all ### +# Covers JetBrains IDEs: IntelliJ, RubyMine, PhpStorm, AppCode, PyCharm, CLion, Android Studio, WebStorm and Rider +# Reference: https://intellij-support.jetbrains.com/hc/en-us/articles/206544839 + +# User-specific stuff +.idea/**/workspace.xml +.idea/**/tasks.xml +.idea/**/usage.statistics.xml +.idea/**/dictionaries +.idea/**/shelf + +# AWS User-specific +.idea/**/aws.xml + +# Generated files +.idea/**/contentModel.xml + +# Sensitive or high-churn files +.idea/**/dataSources/ +.idea/**/dataSources.ids +.idea/**/dataSources.local.xml +.idea/**/sqlDataSources.xml +.idea/**/dynamic.xml +.idea/**/uiDesigner.xml +.idea/**/dbnavigator.xml + +# Gradle +.idea/**/gradle.xml +.idea/**/libraries + +# Gradle and Maven with auto-import +# When using Gradle or Maven with auto-import, you should exclude module files, +# since they will be recreated, and may cause churn. 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You may not convey a covered +work if you are a party to an arrangement with a third party that is +in the business of distributing software, under which you make payment +to the third party based on the extent of your activity of conveying +the work, and under which the third party grants, to any of the +parties who would receive the covered work from you, a discriminatory +patent license (a) in connection with copies of the covered work +conveyed by you (or copies made from those copies), or (b) primarily +for and in connection with specific products or compilations that +contain the covered work, unless you entered into that arrangement, +or that patent license was granted, prior to 28 March 2007. + + Nothing in this License shall be construed as excluding or limiting +any implied license or other defenses to infringement that may +otherwise be available to you under applicable patent law. + + 12. No Surrender of Others' Freedom. + + If conditions are imposed on you (whether by court order, agreement or +otherwise) that contradict the conditions of this License, they do not +excuse you from the conditions of this License. If you cannot convey a +covered work so as to satisfy simultaneously your obligations under this +License and any other pertinent obligations, then as a consequence you may +not convey it at all. For example, if you agree to terms that obligate you +to collect a royalty for further conveying from those to whom you convey +the Program, the only way you could satisfy both those terms and this +License would be to refrain entirely from conveying the Program. + + 13. Use with the GNU Affero General Public License. + + Notwithstanding any other provision of this License, you have +permission to link or combine any covered work with a work licensed +under version 3 of the GNU Affero General Public License into a single +combined work, and to convey the resulting work. The terms of this +License will continue to apply to the part which is the covered work, +but the special requirements of the GNU Affero General Public License, +section 13, concerning interaction through a network will apply to the +combination as such. + + 14. Revised Versions of this License. + + The Free Software Foundation may publish revised and/or new versions of +the GNU General Public License from time to time. Such new versions will +be similar in spirit to the present version, but may differ in detail to +address new problems or concerns. + + Each version is given a distinguishing version number. If the +Program specifies that a certain numbered version of the GNU General +Public License "or any later version" applies to it, you have the +option of following the terms and conditions either of that numbered +version or of any later version published by the Free Software +Foundation. If the Program does not specify a version number of the +GNU General Public License, you may choose any version ever published +by the Free Software Foundation. + + If the Program specifies that a proxy can decide which future +versions of the GNU General Public License can be used, that proxy's +public statement of acceptance of a version permanently authorizes you +to choose that version for the Program. + + Later license versions may give you additional or different +permissions. However, no additional obligations are imposed on any +author or copyright holder as a result of your choosing to follow a +later version. + + 15. Disclaimer of Warranty. + + THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY +APPLICABLE LAW. EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT +HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY +OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, +THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR +PURPOSE. THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM +IS WITH YOU. SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF +ALL NECESSARY SERVICING, REPAIR OR CORRECTION. + + 16. Limitation of Liability. + + IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING +WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS +THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY +GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE +USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF +DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD +PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS), +EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF +SUCH DAMAGES. + + 17. Interpretation of Sections 15 and 16. + + If the disclaimer of warranty and limitation of liability provided +above cannot be given local legal effect according to their terms, +reviewing courts shall apply local law that most closely approximates +an absolute waiver of all civil liability in connection with the +Program, unless a warranty or assumption of liability accompanies a +copy of the Program in return for a fee. + + END OF TERMS AND CONDITIONS + + How to Apply These Terms to Your New Programs + + If you develop a new program, and you want it to be of the greatest +possible use to the public, the best way to achieve this is to make it +free software which everyone can redistribute and change under these terms. + + To do so, attach the following notices to the program. It is safest +to attach them to the start of each source file to most effectively +state the exclusion of warranty; and each file should have at least +the "copyright" line and a pointer to where the full notice is found. + + + Copyright (C) + + This program is free software: you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation, either version 3 of the License, or + (at your option) any later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program. If not, see . + +Also add information on how to contact you by electronic and paper mail. + + If the program does terminal interaction, make it output a short +notice like this when it starts in an interactive mode: + + Copyright (C) + This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'. + This is free software, and you are welcome to redistribute it + under certain conditions; type `show c' for details. + +The hypothetical commands `show w' and `show c' should show the appropriate +parts of the General Public License. Of course, your program's commands +might be different; for a GUI interface, you would use an "about box". + + You should also get your employer (if you work as a programmer) or school, +if any, to sign a "copyright disclaimer" for the program, if necessary. +For more information on this, and how to apply and follow the GNU GPL, see +. + + The GNU General Public License does not permit incorporating your program +into proprietary programs. If your program is a subroutine library, you +may consider it more useful to permit linking proprietary applications with +the library. If this is what you want to do, use the GNU Lesser General +Public License instead of this License. But first, please read +. \ No newline at end of file diff --git a/pom.xml b/pom.xml new file mode 100644 index 00000000..f261de71 --- /dev/null +++ b/pom.xml @@ -0,0 +1,102 @@ + + + 4.0.0 + + net.azisaba + Kuvel + 1.0.0 + jar + + ${project.artifactId} + Server-discovery Velocity plugin for Minecraft servers running in a Kubernetes + cluster. + + + https://github.com/AzisabaNetwork/Kuvel + + AzisabaNetwork + https://github.com/AzisabaNetwork + + + + 17 + UTF-8 + + + + ${project.name} + clean package + + + org.apache.maven.plugins + maven-compiler-plugin + 3.10.0 + + ${java.version} + ${java.version} + + + + org.apache.maven.plugins + maven-shade-plugin + 3.2.4 + + + package + + shade + + + false + + + + + + + + src/main/resources + true + + + + + + + velocity + https://nexus.velocitypowered.com/repository/maven-public/ + + + + + + com.velocitypowered + velocity-api + 3.0.1 + provided + + + io.fabric8 + kubernetes-client + 5.12.1 + + + redis.clients + jedis + 4.1.1 + + + org.apache.commons + commons-lang3 + 3.12.0 + + + org.projectlombok + lombok + 1.18.22 + provided + + + \ No newline at end of file diff --git a/renovate.json b/renovate.json new file mode 100644 index 00000000..8adb77ad --- /dev/null +++ b/renovate.json @@ -0,0 +1,6 @@ +{ + "$schema": "https://docs.renovatebot.com/renovate-schema.json", + "extends": [ + "local>AzisabaNetwork/renovate-config" + ] +} \ No newline at end of file diff --git a/src/main/java/net/azisaba/kuvel/Kuvel.java b/src/main/java/net/azisaba/kuvel/Kuvel.java new file mode 100644 index 00000000..8af9c2fd --- /dev/null +++ b/src/main/java/net/azisaba/kuvel/Kuvel.java @@ -0,0 +1,147 @@ +package net.azisaba.kuvel; + +import com.google.inject.Inject; +import com.velocitypowered.api.event.Subscribe; +import com.velocitypowered.api.event.proxy.ProxyInitializeEvent; +import com.velocitypowered.api.event.proxy.ProxyShutdownEvent; +import com.velocitypowered.api.plugin.Plugin; +import com.velocitypowered.api.proxy.ProxyServer; +import io.fabric8.kubernetes.client.DefaultKubernetesClient; +import io.fabric8.kubernetes.client.KubernetesClient; +import java.util.Objects; +import java.util.concurrent.TimeUnit; +import java.util.logging.Logger; +import lombok.Getter; +import net.azisaba.kuvel.config.KuvelConfig; +import net.azisaba.kuvel.discovery.impl.RedisLoadBalancerDiscovery; +import net.azisaba.kuvel.discovery.impl.RedisServerDiscovery; +import net.azisaba.kuvel.discovery.impl.SimpleLoadBalancerDiscovery; +import net.azisaba.kuvel.discovery.impl.SimpleServerDiscovery; +import net.azisaba.kuvel.listener.LoadBalancerListener; +import net.azisaba.kuvel.redis.ProxyIdProvider; +import net.azisaba.kuvel.redis.RedisConnectionLeader; +import net.azisaba.kuvel.redis.RedisSubscriber; + +@Plugin( + id = "kuvel", + name = "Kuvel", + version = "1.0.0", + url = "https://github.com/AzisabaNetwork/Kuvel", + description = + "Server-discovery Velocity plugin for Minecraft servers running in a Kubernetes cluster.", + authors = {"Azisaba Network"}) +@Getter +public class Kuvel { + + private final ProxyServer proxy; + private final Logger logger; + + private final KubernetesClient client = new DefaultKubernetesClient(); + private KuvelServiceHandler kuvelServiceHandler; + private RedisConnectionLeader redisConnectionLeader; + private ProxyIdProvider proxyIdProvider; + private RedisSubscriber redisSubscriber; + + private KuvelConfig kuvelConfig; + + @Inject + public Kuvel(ProxyServer server, Logger logger) { + this.proxy = server; + this.logger = logger; + } + + @Subscribe + public void onProxyInitialization(ProxyInitializeEvent event) { + kuvelConfig = new KuvelConfig(this); + try { + kuvelConfig.load(); + } catch (Exception e) { + logger.severe("Failed to load config file. Plugin feature will be disabled."); + e.printStackTrace(); + return; + } + + kuvelServiceHandler = new KuvelServiceHandler(this, client); + if (kuvelConfig.isRedisEnabled()) { + Objects.requireNonNull(kuvelConfig.getRedisConnectionData()); + Objects.requireNonNull(kuvelConfig.getProxyGroupName()); + + proxyIdProvider = + new ProxyIdProvider( + kuvelConfig.getRedisConnectionData().createJedisPool(), + kuvelConfig.getProxyGroupName()); + proxyIdProvider.runTask(proxy, this); + + redisConnectionLeader = + new RedisConnectionLeader( + kuvelConfig.getRedisConnectionData().createJedisPool(), + kuvelConfig.getProxyGroupName(), + proxyIdProvider.getId()); + + redisConnectionLeader.trySwitch(); + if (redisConnectionLeader.isLeader()) { + logger.info("This proxy is selected as leader."); + } + kuvelServiceHandler.setAndRunLoadBalancerDiscovery( + new RedisLoadBalancerDiscovery( + client, + this, + kuvelConfig.getRedisConnectionData().createJedisPool(), + kuvelConfig.getProxyGroupName(), + redisConnectionLeader, + kuvelServiceHandler)); + + kuvelServiceHandler.setAndRunServerDiscovery( + new RedisServerDiscovery( + client, + this, + kuvelConfig.getRedisConnectionData().createJedisPool(), + kuvelConfig.getProxyGroupName(), + redisConnectionLeader, + kuvelServiceHandler)); + + proxy + .getScheduler() + .buildTask( + this, + () -> { + if (redisConnectionLeader.isLeader()) { + redisConnectionLeader.extendLeader(); + } else { + redisConnectionLeader.trySwitch(); + } + }) + .repeat(5, TimeUnit.MINUTES) + .schedule(); + + redisSubscriber = + new RedisSubscriber( + kuvelConfig.getRedisConnectionData().createJedisPool(), + this, + kuvelConfig.getProxyGroupName(), + kuvelServiceHandler, + redisConnectionLeader); + redisSubscriber.subscribe(); + } else { + kuvelServiceHandler.setAndRunLoadBalancerDiscovery( + new SimpleLoadBalancerDiscovery(client, this, kuvelServiceHandler)); + kuvelServiceHandler.setAndRunServerDiscovery( + new SimpleServerDiscovery(client, this, kuvelServiceHandler)); + } + + proxy.getEventManager().register(this, new LoadBalancerListener(this, kuvelServiceHandler)); + } + + @Subscribe + public void onProxyShutdown(ProxyShutdownEvent event) { + if (kuvelServiceHandler != null) { + kuvelServiceHandler.shutdown(); + } + if (redisConnectionLeader != null) { + redisConnectionLeader.leaveLeader(); + } + if (proxyIdProvider != null) { + proxyIdProvider.deleteProxyId(); + } + } +} diff --git a/src/main/java/net/azisaba/kuvel/KuvelServiceHandler.java b/src/main/java/net/azisaba/kuvel/KuvelServiceHandler.java new file mode 100644 index 00000000..829c8876 --- /dev/null +++ b/src/main/java/net/azisaba/kuvel/KuvelServiceHandler.java @@ -0,0 +1,214 @@ +package net.azisaba.kuvel; + +import com.velocitypowered.api.proxy.server.ServerInfo; +import io.fabric8.kubernetes.api.model.Pod; +import io.fabric8.kubernetes.client.KubernetesClient; +import java.net.InetSocketAddress; +import java.util.ArrayList; +import java.util.HashMap; +import java.util.List; +import java.util.Map.Entry; +import java.util.Optional; +import javax.annotation.Nullable; +import lombok.Getter; +import lombok.RequiredArgsConstructor; +import net.azisaba.kuvel.discovery.LoadBalancerDiscovery; +import net.azisaba.kuvel.discovery.ServerDiscovery; +import net.azisaba.kuvel.loadbalancer.LoadBalancer; +import net.azisaba.kuvel.util.LabelKeys; +import net.azisaba.kuvel.util.UidAndServerNameMap; + +@Getter +@RequiredArgsConstructor +public class KuvelServiceHandler { + + private final Kuvel plugin; + private final KubernetesClient client; + private final HashMap loadBalancerServerMap = new HashMap<>(); + + private final UidAndServerNameMap podUidAndServerNameMap = new UidAndServerNameMap(); + private final UidAndServerNameMap replicaSetUidAndServerNameMap = new UidAndServerNameMap(); + + private ServerDiscovery serverDiscovery; + private LoadBalancerDiscovery loadBalancerDiscovery; + + public void registerLoadBalancer(LoadBalancer loadBalancer) { + loadBalancerServerMap.put(loadBalancer.getServer().getServerInfo().getName(), loadBalancer); + replicaSetUidAndServerNameMap.register( + loadBalancer.getReplicaSetUid(), loadBalancer.getServer().getServerInfo().getName()); + updateLoadBalancerEndpoints(loadBalancer); + + String serverName = loadBalancer.getServer().getServerInfo().getName(); + plugin + .getLogger() + .info( + "Registered load balancer: " + + serverName + + " (" + + loadBalancer.getReplicaSetUid() + + ")"); + } + + public void unregisterLoadBalancer(String replicaSetUid) { + String serverName = replicaSetUidAndServerNameMap.getServerNameFromUid(replicaSetUid); + if (serverName == null) { + return; + } + LoadBalancer loadBalancer = loadBalancerServerMap.get(serverName); + if (loadBalancer != null) { + unregisterLoadBalancer(loadBalancer); + } + } + + public void unregisterLoadBalancer(LoadBalancer loadBalancer) { + String serverName = loadBalancer.getServer().getServerInfo().getName(); + plugin + .getProxy() + .getServer(serverName) + .ifPresent(server -> plugin.getProxy().unregisterServer(server.getServerInfo())); + loadBalancerServerMap.remove(serverName); + replicaSetUidAndServerNameMap.unregister(loadBalancer.getReplicaSetUid()); + + plugin + .getLogger() + .info( + "Unregistered load balancer: " + + serverName + + " (" + + loadBalancer.getReplicaSetUid() + + ")"); + } + + public Optional getLoadBalancer(String serverName) { + return Optional.ofNullable(loadBalancerServerMap.get(serverName)); + } + + private void updateLoadBalancerEndpoints(LoadBalancer loadBalancer) { + List pods = + client + .pods() + .inAnyNamespace() + .withLabel(LabelKeys.SERVER_DISCOVERY.getKey(), "true") + .list() + .getItems(); + + List endpoints = new ArrayList<>(); + for (Pod pod : pods) { + if (pod.hasOwnerReferenceFor(loadBalancer.getReplicaSetUid())) { + String serverName = podUidAndServerNameMap.getServerNameFromUid(pod.getMetadata().getUid()); + if (serverName != null) { + endpoints.add(serverName); + } + } + } + loadBalancer.setEndpoints(endpoints); + } + + public void setAndRunServerDiscovery(@Nullable ServerDiscovery newServerDiscovery) { + if (serverDiscovery != null) { + serverDiscovery.shutdown(); + } + + serverDiscovery = newServerDiscovery; + if (serverDiscovery != null) { + HashMap servers = serverDiscovery.getServersForStartup(); + for (Entry entry : servers.entrySet()) { + Pod pod = entry.getValue(); + InetSocketAddress address = new InetSocketAddress(pod.getStatus().getPodIP(), 25565); + plugin.getProxy().registerServer(new ServerInfo(entry.getKey(), address)); + + for (LoadBalancer loadBalancer : loadBalancerServerMap.values()) { + if (pod.hasOwnerReferenceFor(loadBalancer.getReplicaSetUid())) { + loadBalancer.addEndpoint(entry.getKey()); + } + } + } + serverDiscovery.start(); + } + } + + public void setAndRunLoadBalancerDiscovery( + @Nullable LoadBalancerDiscovery newLoadBalancerDiscovery) { + if (loadBalancerDiscovery != null) { + loadBalancerDiscovery.shutdown(); + } + + loadBalancerDiscovery = newLoadBalancerDiscovery; + if (loadBalancerDiscovery != null) { + loadBalancerDiscovery.registerLoadBalancersForStartup(); + loadBalancerDiscovery.start(); + } + } + + public void shutdown() { + if (serverDiscovery != null) { + serverDiscovery.shutdown(); + } + if (loadBalancerDiscovery != null) { + loadBalancerDiscovery.shutdown(); + } + } + + public void registerPod(Pod pod, String serverName) { + InetSocketAddress address = new InetSocketAddress(pod.getStatus().getPodIP(), 25565); + plugin.getProxy().registerServer(new ServerInfo(serverName, address)); + podUidAndServerNameMap.register(pod.getMetadata().getUid(), serverName); + + for (LoadBalancer loadBalancer : loadBalancerServerMap.values()) { + if (pod.hasOwnerReferenceFor(loadBalancer.getReplicaSetUid())) { + loadBalancer.addEndpoint(serverName); + } + } + + plugin + .getLogger() + .info("Registered server: " + serverName + " (" + pod.getMetadata().getUid() + ")"); + } + + public void registerPod(String podUid, String serverName) { + Optional pod = + client + .pods() + .inAnyNamespace() + .withLabel(LabelKeys.SERVER_DISCOVERY.getKey(), "true") + .list() + .getItems() + .stream() + .filter(p -> p.getMetadata().getUid().equals(podUid)) + .findFirst(); + + if (!pod.isPresent()) { + return; + } + + registerPod(pod.get(), serverName); + } + + public void unregisterPod(String podUid) { + if (podUidAndServerNameMap.getServerNameFromUid(podUid) == null) { + return; + } + + String serverName = podUidAndServerNameMap.unregister(podUid); + plugin + .getProxy() + .getServer(serverName) + .ifPresent(server -> plugin.getProxy().unregisterServer(server.getServerInfo())); + + for (LoadBalancer loadBalancer : loadBalancerServerMap.values()) { + if (loadBalancer.getEndpointServers().contains(serverName)) { + loadBalancer.removeEndpoint(serverName); + } + } + + plugin.getLogger().info("Unregistered server: " + serverName + " (" + podUid + ")"); + } + + public void unregisterPod(Pod pod) { + unregisterPod(pod.getMetadata().getUid()); + } + + public boolean isPodRegistered(String podId) { + return podUidAndServerNameMap.getServerNameFromUid(podId) != null; + } +} diff --git a/src/main/java/net/azisaba/kuvel/config/KuvelConfig.java b/src/main/java/net/azisaba/kuvel/config/KuvelConfig.java new file mode 100644 index 00000000..0ac99006 --- /dev/null +++ b/src/main/java/net/azisaba/kuvel/config/KuvelConfig.java @@ -0,0 +1,58 @@ +package net.azisaba.kuvel.config; + +import java.io.File; +import java.io.IOException; +import java.util.Map; +import javax.annotation.Nullable; +import lombok.Getter; +import lombok.RequiredArgsConstructor; +import net.azisaba.kuvel.Kuvel; +import net.azisaba.kuvel.util.RedisConnectionData; + +@Getter +@RequiredArgsConstructor +public class KuvelConfig { + + private final Kuvel plugin; + + private static final String CONFIG_FILE_PATH = "./plugins/Kuvel/config.yml"; + + private boolean redisEnabled; + @Nullable private RedisConnectionData redisConnectionData; + @Nullable private String proxyGroupName; + + public void load() throws IOException { + VelocityConfigLoader conf = VelocityConfigLoader.load(new File(CONFIG_FILE_PATH)); + conf.saveDefaultConfig(); + + redisEnabled = conf.getBoolean("redis.enable"); + if (redisEnabled) { + String hostname = conf.getString("redis.connection.hostname"); + int port = conf.getInt("redis.connection.port", -1); + String username = conf.getString("redis.connection.username"); + String password = conf.getString("redis.connection.password"); + + if (hostname == null || port <= 0) { + redisEnabled = false; + plugin + .getLogger() + .warning( + "Redis is enabled, but hostname or port is invalid. Redis sync will be disabled."); + } else { + redisConnectionData = new RedisConnectionData(hostname, port, username, password); + } + + proxyGroupName = conf.getString("redis.group-name", null); + } + } + + @SuppressWarnings("unchecked") + public Map dig(Map data, String key) throws IOException { + Object o = data.get(key); + if (!(o instanceof Map)) { + throw new IOException("Failed to get new map from key: " + key); + } + + return (Map) o; + } +} diff --git a/src/main/java/net/azisaba/kuvel/config/VelocityConfigLoader.java b/src/main/java/net/azisaba/kuvel/config/VelocityConfigLoader.java new file mode 100644 index 00000000..a085a7ff --- /dev/null +++ b/src/main/java/net/azisaba/kuvel/config/VelocityConfigLoader.java @@ -0,0 +1,179 @@ +package net.azisaba.kuvel.config; + +import java.io.BufferedReader; +import java.io.File; +import java.io.FileNotFoundException; +import java.io.FileReader; +import java.io.IOException; +import java.io.InputStream; +import java.io.InputStreamReader; +import java.nio.charset.StandardCharsets; +import java.nio.file.Files; +import java.util.HashMap; +import java.util.Locale; +import java.util.Map; +import java.util.Objects; +import java.util.stream.Collectors; +import javax.annotation.Nonnull; +import javax.annotation.Nullable; +import lombok.AccessLevel; +import lombok.RequiredArgsConstructor; +import org.yaml.snakeyaml.Yaml; + +@RequiredArgsConstructor(access = AccessLevel.PRIVATE) +public class VelocityConfigLoader { + + private final File file; + private final HashMap dataMap = new HashMap<>(); + + public static VelocityConfigLoader load(File file) { + return new VelocityConfigLoader(file).load(); + } + + public String getString(@Nonnull String key, String defaultValue) { + String lowerKey = key.toLowerCase(Locale.ROOT); + if (dataMap.containsKey(lowerKey)) { + return dataMap.get(lowerKey).toString(); + } else { + return defaultValue; + } + } + + public int getInt(@Nonnull String key, int defaultValue) { + String lowerKey = key.toLowerCase(Locale.ROOT); + if (dataMap.containsKey(lowerKey)) { + return Integer.parseInt(dataMap.get(lowerKey).toString()); + } else { + return defaultValue; + } + } + + public long getLong(@Nonnull String key, long defaultValue) { + String lowerKey = key.toLowerCase(Locale.ROOT); + if (dataMap.containsKey(lowerKey)) { + return Long.parseLong(dataMap.get(lowerKey).toString()); + } else { + return defaultValue; + } + } + + public boolean getBoolean(@Nonnull String key, boolean defaultValue) { + String lowerKey = key.toLowerCase(Locale.ROOT); + if (dataMap.containsKey(lowerKey)) { + return Boolean.parseBoolean(dataMap.get(lowerKey).toString()); + } else { + return defaultValue; + } + } + + public double getDouble(@Nonnull String key, double defaultValue) { + String lowerKey = key.toLowerCase(Locale.ROOT); + if (dataMap.containsKey(lowerKey)) { + return Double.parseDouble(dataMap.get(lowerKey).toString()); + } else { + return defaultValue; + } + } + + public @Nullable Object get(@Nonnull String key, Object defaultValue) { + String lowerKey = key.toLowerCase(Locale.ROOT); + return dataMap.getOrDefault(lowerKey, defaultValue); + } + + public String getString(@Nonnull String key) { + return getString(key, null); + } + + public int getInt(@Nonnull String key) { + return getInt(key, 0); + } + + public long getLong(@Nonnull String key) { + return getLong(key, 0); + } + + public boolean getBoolean(@Nonnull String key) { + return getBoolean(key, false); + } + + public double getDouble(@Nonnull String key) { + return getDouble(key, 0); + } + + public @Nullable Object get(@Nonnull String key) { + return get(key, null); + } + + private VelocityConfigLoader load() { + Objects.requireNonNull(file); + String fileName = file.getName().toLowerCase(Locale.ROOT); + + if (!fileName.endsWith(".yml") && !fileName.endsWith(".yaml")) { + throw new IllegalArgumentException("File must be a YAML file."); + } + + Yaml yaml = new Yaml(); + Map data; + try { + if (file.exists()) { + data = yaml.load(new FileReader(file)); + } else { + data = new HashMap<>(); + } + } catch (FileNotFoundException e) { + throw new IllegalArgumentException("File not found.", e); + } + + storeDataFor(null, data); + return this; + } + + public void saveDefaultConfig() throws IOException { + if (file.exists()) { + return; + } + + InputStream is = getClass().getClassLoader().getResourceAsStream(file.getName()); + if (is == null) { + throw new IllegalStateException("Failed to load config.yml from resource."); + } + BufferedReader reader = new BufferedReader(new InputStreamReader(is, StandardCharsets.UTF_8)); + Files.createDirectories(file.getParentFile().toPath()); + + byte[] byteStr = + reader + .lines() + .collect(Collectors.joining(System.lineSeparator())) + .getBytes(StandardCharsets.UTF_8); + + Files.write(file.toPath(), byteStr); + + load(); + } + + private void storeDataFor(@Nullable String parentKey, Map map) { + for (String key : map.keySet()) { + String newKey = parentKey == null ? key : parentKey + "." + key; + newKey = newKey.toLowerCase(Locale.ROOT); + if (canDig(map, key)) { + storeDataFor(newKey, dig(map, key)); + } else { + dataMap.put(newKey, map.get(key)); + } + } + } + + private boolean canDig(Map map, String key) { + return map.get(key) instanceof Map; + } + + @SuppressWarnings("unchecked") + private Map dig(Map data, String key) { + Object o = data.get(key); + if (!(o instanceof Map)) { + throw new IllegalArgumentException("Cannot dig."); + } + + return (Map) o; + } +} diff --git a/src/main/java/net/azisaba/kuvel/discovery/LoadBalancerDiscovery.java b/src/main/java/net/azisaba/kuvel/discovery/LoadBalancerDiscovery.java new file mode 100644 index 00000000..276d87d7 --- /dev/null +++ b/src/main/java/net/azisaba/kuvel/discovery/LoadBalancerDiscovery.java @@ -0,0 +1,10 @@ +package net.azisaba.kuvel.discovery; + +public interface LoadBalancerDiscovery { + + void start(); + + void shutdown(); + + void registerLoadBalancersForStartup(); +} diff --git a/src/main/java/net/azisaba/kuvel/discovery/ServerDiscovery.java b/src/main/java/net/azisaba/kuvel/discovery/ServerDiscovery.java new file mode 100644 index 00000000..f57b9da5 --- /dev/null +++ b/src/main/java/net/azisaba/kuvel/discovery/ServerDiscovery.java @@ -0,0 +1,14 @@ +package net.azisaba.kuvel.discovery; + +import io.fabric8.kubernetes.api.model.Pod; +import java.net.InetSocketAddress; +import java.util.HashMap; + +public interface ServerDiscovery { + + void start(); + + void shutdown(); + + HashMap getServersForStartup(); +} diff --git a/src/main/java/net/azisaba/kuvel/discovery/impl/RedisLoadBalancerDiscovery.java b/src/main/java/net/azisaba/kuvel/discovery/impl/RedisLoadBalancerDiscovery.java new file mode 100644 index 00000000..5bd06a08 --- /dev/null +++ b/src/main/java/net/azisaba/kuvel/discovery/impl/RedisLoadBalancerDiscovery.java @@ -0,0 +1,215 @@ +package net.azisaba.kuvel.discovery.impl; + +import com.velocitypowered.api.proxy.server.RegisteredServer; +import com.velocitypowered.api.proxy.server.ServerInfo; +import io.fabric8.kubernetes.api.model.apps.ReplicaSet; +import io.fabric8.kubernetes.client.KubernetesClient; +import io.fabric8.kubernetes.client.Watcher; +import io.fabric8.kubernetes.client.WatcherException; +import java.net.InetSocketAddress; +import java.util.Collection; +import java.util.Map; +import java.util.concurrent.ExecutorService; +import java.util.concurrent.Executors; +import java.util.concurrent.locks.ReentrantLock; +import lombok.RequiredArgsConstructor; +import net.azisaba.kuvel.Kuvel; +import net.azisaba.kuvel.KuvelServiceHandler; +import net.azisaba.kuvel.discovery.LoadBalancerDiscovery; +import net.azisaba.kuvel.loadbalancer.LoadBalancer; +import net.azisaba.kuvel.loadbalancer.strategy.impl.RoundRobinLoadBalancingStrategy; +import net.azisaba.kuvel.redis.RedisConnectionLeader; +import net.azisaba.kuvel.redis.RedisKeys; +import net.azisaba.kuvel.util.LabelKeys; +import redis.clients.jedis.Jedis; +import redis.clients.jedis.JedisPool; + +@RequiredArgsConstructor +public class RedisLoadBalancerDiscovery implements LoadBalancerDiscovery { + + private final KubernetesClient client; + private final Kuvel plugin; + private final JedisPool jedisPool; + private final String groupName; + private final RedisConnectionLeader redisConnectionLeader; + private final KuvelServiceHandler kuvelServiceHandler; + + private final ExecutorService serverDiscoveryExecutor = Executors.newFixedThreadPool(1); + private final ReentrantLock lock = new ReentrantLock(); + + @Override + public void start() { + if (!redisConnectionLeader.isLeader()) { + return; + } + + run( + serverDiscoveryExecutor, + () -> + client + .apps() + .replicaSets() + .inAnyNamespace() + .withLabel(LabelKeys.SERVER_DISCOVERY.getKey(), "true") + .withLabel(LabelKeys.SERVER_NAME.getKey()) + .watch( + new Watcher() { + @Override + public void eventReceived(Action action, ReplicaSet replicaSet) { + lock.lock(); + try { + if (action == Action.ADDED) { + registerOrIgnore(replicaSet); + } else if (action == Action.DELETED) { + unregisterOrIgnore(replicaSet); + } + } finally { + lock.unlock(); + } + } + + @Override + public void onClose(WatcherException e) {} + })); + } + + private void registerOrIgnore(ReplicaSet replicaSet) { + registerOrIgnore(replicaSet, false); + } + + private void registerOrIgnore(ReplicaSet replicaSet, boolean isFetchedFromRedis) { + String uid = replicaSet.getMetadata().getUid(); + if (kuvelServiceHandler.getReplicaSetUidAndServerNameMap().getServerNameFromUid(uid) != null) { + return; + } + + String serverName = + replicaSet.getMetadata().getLabels().getOrDefault(LabelKeys.SERVER_NAME.getKey(), null); + if (serverName == null) { + return; + } + + try (Jedis jedis = jedisPool.getResource()) { + if (!isFetchedFromRedis) { + Collection loadBalancerNames = + jedis.hgetAll(RedisKeys.LOAD_BALANCERS_PREFIX.getKey() + groupName).values(); + + if (loadBalancerNames.contains(serverName) + || plugin.getProxy().getServer(serverName).isPresent()) { + plugin + .getLogger() + .info("Failed to add load balancer. Server name already occupied: " + serverName); + return; + } + } + + kuvelServiceHandler.getReplicaSetUidAndServerNameMap().register(uid, serverName); + jedis.hset(RedisKeys.LOAD_BALANCERS_PREFIX.getKey() + groupName, uid, serverName); + + redisConnectionLeader.publishNewLoadBalancer(uid, serverName); + + RegisteredServer server = + plugin + .getProxy() + .registerServer(new ServerInfo(serverName, new InetSocketAddress("0.0.0.0", 0))); + + kuvelServiceHandler.registerLoadBalancer( + new LoadBalancer(plugin.getProxy(), server, new RoundRobinLoadBalancingStrategy(), uid)); + } + } + + private void unregisterOrIgnore(ReplicaSet replicaSet) { + String uid = replicaSet.getMetadata().getUid(); + if (kuvelServiceHandler.getReplicaSetUidAndServerNameMap().getServerNameFromUid(uid) == null) { + return; + } + + kuvelServiceHandler.unregisterLoadBalancer(uid); + // podUidAndServerNameMap.unregister(uid); // no need + redisConnectionLeader.publishDeletedLoadBalancer(replicaSet.getMetadata().getUid()); + + try (Jedis jedis = jedisPool.getResource()) { + jedis.hdel(RedisKeys.LOAD_BALANCERS_PREFIX.getKey() + groupName, uid); + } + } + + @Override + public void shutdown() { + serverDiscoveryExecutor.shutdownNow(); + } + + @Override + public void registerLoadBalancersForStartup() { + if (redisConnectionLeader.isLeader()) { + try (Jedis jedis = jedisPool.getResource()) { + Map uidAndServerNameMapInRedis = + jedis.hgetAll(RedisKeys.LOAD_BALANCERS_PREFIX.getKey() + groupName); + for (Map.Entry entry : uidAndServerNameMapInRedis.entrySet()) { + ReplicaSet replicaSet = getReplicaSetFromUid(entry.getKey()); + if (replicaSet == null) { + jedis.hdel(RedisKeys.LOAD_BALANCERS_PREFIX.getKey() + groupName, entry.getKey()); + continue; + } + registerOrIgnore(replicaSet, true); + } + + client + .apps() + .replicaSets() + .inAnyNamespace() + .withLabel(LabelKeys.SERVER_DISCOVERY.getKey(), "true") + .withLabel(LabelKeys.SERVER_NAME.getKey()) + .list() + .getItems() + .stream() + .filter( + replicaSet -> + !uidAndServerNameMapInRedis.containsKey(replicaSet.getMetadata().getUid())) + .forEach(this::registerOrIgnore); + } + } else { + try (Jedis jedis = jedisPool.getResource()) { + Map uidAndServerNameMapInRedis = + jedis.hgetAll(RedisKeys.LOAD_BALANCERS_PREFIX.getKey() + groupName); + for (Map.Entry entry : uidAndServerNameMapInRedis.entrySet()) { + ReplicaSet replicaSet = getReplicaSetFromUid(entry.getKey()); + if (replicaSet == null) { + continue; + } + registerOrIgnore(replicaSet, true); + } + } + } + } + + private ReplicaSet getReplicaSetFromUid(String uid) { + return client + .apps() + .replicaSets() + .inAnyNamespace() + .withLabel(LabelKeys.SERVER_DISCOVERY.getKey(), "true") + .withLabel(LabelKeys.SERVER_NAME.getKey()) + .list() + .getItems() + .stream() + .filter(replicaSet -> replicaSet.getMetadata().getUid().equals(uid)) + .findAny() + .orElse(null); + } + + private void run(ExecutorService service, Runnable runnable) { + service.submit(runnable); + for (int i = 0; i < 1000; i++) { + service.submit( + () -> { + try { + Thread.sleep(3000); + } catch (InterruptedException e) { + Thread.currentThread().interrupt(); + } + + runnable.run(); + }); + } + } +} diff --git a/src/main/java/net/azisaba/kuvel/discovery/impl/RedisServerDiscovery.java b/src/main/java/net/azisaba/kuvel/discovery/impl/RedisServerDiscovery.java new file mode 100644 index 00000000..fcd60cd7 --- /dev/null +++ b/src/main/java/net/azisaba/kuvel/discovery/impl/RedisServerDiscovery.java @@ -0,0 +1,256 @@ +package net.azisaba.kuvel.discovery.impl; + +import io.fabric8.kubernetes.api.model.Pod; +import io.fabric8.kubernetes.client.KubernetesClient; +import io.fabric8.kubernetes.client.Watcher; +import io.fabric8.kubernetes.client.WatcherException; +import java.util.ArrayList; +import java.util.HashMap; +import java.util.Map; +import java.util.Map.Entry; +import java.util.concurrent.ExecutorService; +import java.util.concurrent.Executors; +import java.util.concurrent.locks.ReentrantLock; +import java.util.function.Function; +import lombok.RequiredArgsConstructor; +import net.azisaba.kuvel.Kuvel; +import net.azisaba.kuvel.KuvelServiceHandler; +import net.azisaba.kuvel.discovery.ServerDiscovery; +import net.azisaba.kuvel.redis.RedisConnectionLeader; +import net.azisaba.kuvel.redis.RedisKeys; +import net.azisaba.kuvel.util.LabelKeys; +import redis.clients.jedis.Jedis; +import redis.clients.jedis.JedisPool; + +@RequiredArgsConstructor +public class RedisServerDiscovery implements ServerDiscovery { + + private final KubernetesClient client; + private final Kuvel plugin; + private final JedisPool jedisPool; + private final String groupName; + private final RedisConnectionLeader redisConnectionLeader; + private final KuvelServiceHandler kuvelServiceHandler; + + private final ExecutorService serverDiscoveryExecutor = Executors.newFixedThreadPool(1); + private final ReentrantLock lock = new ReentrantLock(); + + @Override + public void start() { + if (!redisConnectionLeader.isLeader()) { + return; + } + + run( + serverDiscoveryExecutor, + () -> + client + .pods() + .inAnyNamespace() + .withLabel(LabelKeys.SERVER_DISCOVERY.getKey(), "true") + .withField("status.phase", "Running") + .watch( + new Watcher() { + @Override + public void eventReceived(Action action, Pod pod) { + lock.lock(); + try { + if (action == Action.ADDED) { + registerPodOrIgnore(pod); + } else if (action == Action.DELETED) { + unregisterPodOrIgnore(pod); + } + } finally { + lock.unlock(); + } + } + + @Override + public void onClose(WatcherException e) {} + })); + } + + @Override + public void shutdown() { + serverDiscoveryExecutor.shutdownNow(); + } + + @Override + public HashMap getServersForStartup() { + Map podIdToServerNameMap; + if (redisConnectionLeader.isLeader()) { + try (Jedis jedis = jedisPool.getResource()) { + podIdToServerNameMap = new HashMap<>(jedis.hgetAll(RedisKeys.SERVERS_PREFIX + groupName)); + + for (String podUid : new ArrayList<>(podIdToServerNameMap.keySet())) { + if (getPodUsingPodUid(podUid) == null) { + podIdToServerNameMap.remove(podUid); + jedis.hdel(RedisKeys.SERVERS_PREFIX + groupName, podUid); + redisConnectionLeader.publishDeletedServer(podUid); + } + } + + Map loadBalancerMap = + jedis.hgetAll(RedisKeys.LOAD_BALANCERS_PREFIX.getKey() + groupName); + + client + .pods() + .inAnyNamespace() + .withLabel(LabelKeys.SERVER_DISCOVERY.getKey(), "true") + .withField("status.phase", "Running") + .list() + .getItems() + .forEach( + pod -> { + String uid = pod.getMetadata().getUid(); + if (podIdToServerNameMap.containsKey(uid)) { + return; + } + + String preferServerName = + pod.getMetadata() + .getLabels() + .getOrDefault( + LabelKeys.SERVER_NAME.getKey(), pod.getMetadata().getName()); + String serverName = + getValidServerName( + preferServerName, + (name) -> + !podIdToServerNameMap.containsValue(name) + && !loadBalancerMap.containsValue(name) + && !plugin.getProxy().getServer(name).isPresent()); + + podIdToServerNameMap.put(uid, serverName); + jedis.hset(RedisKeys.SERVERS_PREFIX + groupName, uid, serverName); + }); + } + } else { + try (Jedis jedis = jedisPool.getResource()) { + podIdToServerNameMap = jedis.hgetAll(RedisKeys.SERVERS_PREFIX + groupName); + } + } + + String verb = "Fetched"; + if (redisConnectionLeader.isLeader()) { + verb = "Found"; + } + + for (String podUid : podIdToServerNameMap.keySet()) { + plugin + .getLogger() + .info(verb + " server: " + podIdToServerNameMap.get(podUid) + " (" + podUid + ")"); + } + + HashMap servers = new HashMap<>(); + for (Entry entry : podIdToServerNameMap.entrySet()) { + Pod pod = getPodUsingPodUid(entry.getKey()); + if (pod == null) { + continue; + } + + servers.put(entry.getValue(), pod); + kuvelServiceHandler.getPodUidAndServerNameMap().register(entry.getKey(), entry.getValue()); + } + return servers; + } + + private void registerPodOrIgnore(Pod pod) { + String uid = pod.getMetadata().getUid(); + if (kuvelServiceHandler.getPodUidAndServerNameMap().getServerNameFromUid(uid) != null) { + return; + } + + String serverName; + + try (Jedis jedis = jedisPool.getResource()) { + Map serverMap = jedis.hgetAll(RedisKeys.SERVERS_PREFIX.getKey() + groupName); + Map loadBalancerMap = + jedis.hgetAll(RedisKeys.LOAD_BALANCERS_PREFIX.getKey() + groupName); + + String preferServerName = + pod.getMetadata() + .getLabels() + .getOrDefault(LabelKeys.SERVER_NAME.getKey(), pod.getMetadata().getName()); + + serverName = + getValidServerName( + preferServerName, + (name) -> + !serverMap.containsValue(name) + && !loadBalancerMap.containsValue(name) + && !plugin.getProxy().getServer(name).isPresent()); + + kuvelServiceHandler.getPodUidAndServerNameMap().register(uid, serverName); + jedis.hset(RedisKeys.SERVERS_PREFIX.getKey() + groupName, uid, serverName); + + redisConnectionLeader.publishNewServer(uid, serverName); + kuvelServiceHandler.registerPod(pod, serverName); + } + } + + private void unregisterPodOrIgnore(Pod pod) { + String uid = pod.getMetadata().getUid(); + if (kuvelServiceHandler.getPodUidAndServerNameMap().getServerNameFromUid(uid) == null) { + return; + } + + kuvelServiceHandler.unregisterPod(uid); + // podUidAndServerNameMap.unregister(uid); // no need + redisConnectionLeader.publishDeletedServer(pod.getMetadata().getUid()); + + try (Jedis jedis = jedisPool.getResource()) { + jedis.hdel(RedisKeys.SERVERS_PREFIX.getKey() + groupName, uid); + } + } + + private Pod getPodUsingPodUid(String podUid) { + return client.pods().list().getItems().stream() + .filter(pod -> pod.getMetadata().getUid().equals(podUid)) + .findFirst() + .orElse(null); + } + + private String getValidServerName(String prefer, Function isValid) { + if (isValid.apply(prefer)) { + return prefer; + } + + String name = prefer + "-1"; + int i = 1; + while (!isValid.apply(name)) { + name = name.substring(0, name.length() - (1 + String.valueOf(i).length())) + "-" + (i + 1); + i++; + } + return name; + } + + private String getValidServerNameComparingRegisteredServers(String prefer) { + if (!plugin.getProxy().getServer(prefer).isPresent()) { + return prefer; + } + + String name = prefer + "-1"; + int i = 1; + while (plugin.getProxy().getServer(name).isPresent()) { + name = name.substring(0, name.length() - (1 + String.valueOf(i).length())) + "-" + (i + 1); + i++; + } + return name; + } + + private void run(ExecutorService service, Runnable runnable) { + service.submit(runnable); + for (int i = 0; i < 1000; i++) { + service.submit( + () -> { + try { + Thread.sleep(3000); + } catch (InterruptedException e) { + Thread.currentThread().interrupt(); + } + + runnable.run(); + }); + } + } +} diff --git a/src/main/java/net/azisaba/kuvel/discovery/impl/SimpleLoadBalancerDiscovery.java b/src/main/java/net/azisaba/kuvel/discovery/impl/SimpleLoadBalancerDiscovery.java new file mode 100644 index 00000000..33af6f60 --- /dev/null +++ b/src/main/java/net/azisaba/kuvel/discovery/impl/SimpleLoadBalancerDiscovery.java @@ -0,0 +1,129 @@ +package net.azisaba.kuvel.discovery.impl; + +import com.velocitypowered.api.proxy.server.RegisteredServer; +import com.velocitypowered.api.proxy.server.ServerInfo; +import io.fabric8.kubernetes.api.model.apps.ReplicaSet; +import io.fabric8.kubernetes.client.KubernetesClient; +import io.fabric8.kubernetes.client.Watcher; +import io.fabric8.kubernetes.client.WatcherException; +import java.net.InetSocketAddress; +import java.util.concurrent.ExecutorService; +import java.util.concurrent.Executors; +import java.util.concurrent.locks.ReentrantLock; +import lombok.RequiredArgsConstructor; +import net.azisaba.kuvel.Kuvel; +import net.azisaba.kuvel.KuvelServiceHandler; +import net.azisaba.kuvel.discovery.LoadBalancerDiscovery; +import net.azisaba.kuvel.loadbalancer.LoadBalancer; +import net.azisaba.kuvel.loadbalancer.strategy.impl.RoundRobinLoadBalancingStrategy; +import net.azisaba.kuvel.util.LabelKeys; + +@RequiredArgsConstructor +public class SimpleLoadBalancerDiscovery implements LoadBalancerDiscovery { + + private final KubernetesClient client; + private final Kuvel plugin; + private final KuvelServiceHandler kuvelServiceHandler; + + private final ExecutorService loadBalancerDiscoveryExecutor = Executors.newFixedThreadPool(1); + private final ReentrantLock lock = new ReentrantLock(); + + @Override + public void start() { + run( + loadBalancerDiscoveryExecutor, + () -> + client + .apps() + .replicaSets() + .inAnyNamespace() + .withLabel(LabelKeys.SERVER_DISCOVERY.getKey(), "true") + .withLabel(LabelKeys.SERVER_NAME.getKey()) + .watch( + new Watcher() { + @Override + public void eventReceived(Action action, ReplicaSet replicaSet) { + lock.lock(); + try { + if (action == Action.ADDED) { + registerOrIgnore(replicaSet); + } else if (action == Action.DELETED) { + unregisterOrIgnore(replicaSet); + } + } finally { + lock.unlock(); + } + } + + @Override + public void onClose(WatcherException e) {} + })); + } + + @Override + public void shutdown() { + loadBalancerDiscoveryExecutor.shutdownNow(); + } + + @Override + public void registerLoadBalancersForStartup() { + client + .apps() + .replicaSets() + .inAnyNamespace() + .withLabel(LabelKeys.SERVER_DISCOVERY.getKey(), "true") + .withLabel(LabelKeys.SERVER_NAME.getKey()) + .list() + .getItems() + .forEach(this::registerOrIgnore); + } + + private void registerOrIgnore(ReplicaSet replicaSet) { + String uid = replicaSet.getMetadata().getUid(); + if (kuvelServiceHandler.getReplicaSetUidAndServerNameMap().getServerNameFromUid(uid) != null) { + return; + } + + String serverName = replicaSet.getMetadata().getLabels().get(LabelKeys.SERVER_NAME.getKey()); + + if (plugin.getProxy().getServer(serverName).isPresent()) { + plugin + .getLogger() + .info("Failed to add load balancer. Server name already occupied: " + serverName); + return; + } + RegisteredServer server = + plugin + .getProxy() + .registerServer(new ServerInfo(serverName, new InetSocketAddress("0.0.0.0", 0))); + + LoadBalancer loadBalancer = + new LoadBalancer(plugin.getProxy(), server, new RoundRobinLoadBalancingStrategy(), uid); + kuvelServiceHandler.registerLoadBalancer(loadBalancer); + } + + public void unregisterOrIgnore(ReplicaSet replicaSet) { + String uid = replicaSet.getMetadata().getUid(); + if (kuvelServiceHandler.getReplicaSetUidAndServerNameMap().getServerNameFromUid(uid) == null) { + return; + } + + kuvelServiceHandler.unregisterLoadBalancer(uid); + } + + private void run(ExecutorService service, Runnable runnable) { + service.submit(runnable); + for (int i = 0; i < 1000; i++) { + service.submit( + () -> { + try { + Thread.sleep(3000); + } catch (InterruptedException e) { + Thread.currentThread().interrupt(); + } + + runnable.run(); + }); + } + } +} diff --git a/src/main/java/net/azisaba/kuvel/discovery/impl/SimpleServerDiscovery.java b/src/main/java/net/azisaba/kuvel/discovery/impl/SimpleServerDiscovery.java new file mode 100644 index 00000000..7df53b7d --- /dev/null +++ b/src/main/java/net/azisaba/kuvel/discovery/impl/SimpleServerDiscovery.java @@ -0,0 +1,153 @@ +package net.azisaba.kuvel.discovery.impl; + +import io.fabric8.kubernetes.api.model.Pod; +import io.fabric8.kubernetes.client.KubernetesClient; +import io.fabric8.kubernetes.client.Watcher; +import io.fabric8.kubernetes.client.WatcherException; +import java.util.HashMap; +import java.util.concurrent.ExecutorService; +import java.util.concurrent.Executors; +import java.util.concurrent.locks.ReentrantLock; +import lombok.RequiredArgsConstructor; +import net.azisaba.kuvel.Kuvel; +import net.azisaba.kuvel.KuvelServiceHandler; +import net.azisaba.kuvel.discovery.ServerDiscovery; +import net.azisaba.kuvel.util.LabelKeys; + +@RequiredArgsConstructor +public class SimpleServerDiscovery implements ServerDiscovery { + + private final KubernetesClient client; + private final Kuvel plugin; + private final KuvelServiceHandler kuvelServiceHandler; + + private final ExecutorService serverDiscoveryExecutor = Executors.newFixedThreadPool(1); + + private final ReentrantLock lock = new ReentrantLock(); + + @Override + public void start() { + run( + serverDiscoveryExecutor, + () -> + client + .pods() + .inAnyNamespace() + .withLabel(LabelKeys.SERVER_DISCOVERY.getKey(), "true") + .withField("status.phase", "Running") + .watch( + new Watcher() { + @Override + public void eventReceived(Action action, Pod pod) { + lock.lock(); + try { + if (action == Action.ADDED) { + registerPodOrIgnore(pod); + } else if (action == Action.DELETED) { + unregisterPodOrIgnore(pod); + } + } finally { + lock.unlock(); + } + } + + @Override + public void onClose(WatcherException e) {} + })); + } + + @Override + public void shutdown() { + serverDiscoveryExecutor.shutdownNow(); + } + + @Override + public HashMap getServersForStartup() { + HashMap servers = new HashMap<>(); + client + .pods() + .withLabel(LabelKeys.SERVER_DISCOVERY.getKey(), "true") + .list() + .getItems() + .forEach( + pod -> { + String uid = pod.getMetadata().getUid(); + String serverName = + pod.getMetadata() + .getLabels() + .getOrDefault(LabelKeys.SERVER_NAME.getKey(), pod.getMetadata().getUid()); + + if (servers.containsKey(serverName) + || plugin.getProxy().getServer(serverName).isPresent()) { + serverName += "-1"; + int i = 1; + while (servers.containsKey(serverName) + && !plugin.getProxy().getServer(serverName).isPresent()) { + serverName = + serverName.substring( + 0, serverName.length() - (1 + String.valueOf(i).length())) + + "-" + + (i + 1); + i++; + } + } + servers.put(serverName, pod); + kuvelServiceHandler.getPodUidAndServerNameMap().register(uid, serverName); + + plugin.getLogger().info("Found server: " + serverName + " (" + uid + ")"); + }); + + return servers; + } + + private void registerPodOrIgnore(Pod pod) { + String uid = pod.getMetadata().getUid(); + if (kuvelServiceHandler.getPodUidAndServerNameMap().getServerNameFromUid(uid) != null) { + return; + } + + String serverName = + getValidServerName( + pod.getMetadata() + .getLabels() + .getOrDefault(LabelKeys.SERVER_NAME.getKey(), pod.getMetadata().getName())); + + kuvelServiceHandler.getPodUidAndServerNameMap().register(uid, serverName); + kuvelServiceHandler.registerPod(pod, serverName); + } + + private void unregisterPodOrIgnore(Pod pod) { + kuvelServiceHandler.unregisterPod(pod); + // podUidAndServerNameMap.unregister(uid); // no need + } + + private void run(ExecutorService service, Runnable runnable) { + service.submit(runnable); + for (int i = 0; i < 1000; i++) { + service.submit( + () -> { + try { + Thread.sleep(3000); + } catch (InterruptedException e) { + Thread.currentThread().interrupt(); + } + + runnable.run(); + }); + } + } + + private String getValidServerName(String prefer) { + if (!plugin.getProxy().getServer(prefer).isPresent()) { + return prefer; + } + + String name = prefer + "-1"; + int i = 1; + while (plugin.getProxy().getServer(name).isPresent()) { + name = name.substring(0, name.length() - (1 + String.valueOf(i).length())) + "-" + (i + 1); + i++; + } + return name; + } +} diff --git a/src/main/java/net/azisaba/kuvel/listener/LoadBalancerListener.java b/src/main/java/net/azisaba/kuvel/listener/LoadBalancerListener.java new file mode 100644 index 00000000..379f4cec --- /dev/null +++ b/src/main/java/net/azisaba/kuvel/listener/LoadBalancerListener.java @@ -0,0 +1,59 @@ +package net.azisaba.kuvel.listener; + +import com.velocitypowered.api.event.PostOrder; +import com.velocitypowered.api.event.Subscribe; +import com.velocitypowered.api.event.player.PlayerChooseInitialServerEvent; +import com.velocitypowered.api.event.player.ServerPreConnectEvent; +import com.velocitypowered.api.event.player.ServerPreConnectEvent.ServerResult; +import com.velocitypowered.api.proxy.server.RegisteredServer; +import lombok.RequiredArgsConstructor; +import net.azisaba.kuvel.Kuvel; +import net.azisaba.kuvel.KuvelServiceHandler; + +@RequiredArgsConstructor +public class LoadBalancerListener { + + private final Kuvel plugin; + private final KuvelServiceHandler handler; + + @Subscribe(order = PostOrder.LATE) + public void onServerChanged(PlayerChooseInitialServerEvent event) { + event + .getInitialServer() + .ifPresent( + server -> { + String serverName = server.getServerInfo().getName(); + handler + .getLoadBalancer(serverName) + .ifPresent( + lb -> { + RegisteredServer target = lb.getTarget(); + if (target != null) { + event.setInitialServer(target); + } + }); + }); + } + + @Subscribe(order = PostOrder.LATE) + public void onServerChanged(ServerPreConnectEvent event) { + event + .getResult() + .getServer() + .ifPresent( + server -> { + String serverName = server.getServerInfo().getName(); + handler + .getLoadBalancer(serverName) + .ifPresent( + lb -> { + RegisteredServer target = lb.getTarget(); + if (target != null) { + event.setResult(ServerResult.allowed(target)); + } else { + event.setResult(ServerResult.denied()); + } + }); + }); + } +} diff --git a/src/main/java/net/azisaba/kuvel/loadbalancer/LoadBalancer.java b/src/main/java/net/azisaba/kuvel/loadbalancer/LoadBalancer.java new file mode 100644 index 00000000..d847e6d6 --- /dev/null +++ b/src/main/java/net/azisaba/kuvel/loadbalancer/LoadBalancer.java @@ -0,0 +1,57 @@ +package net.azisaba.kuvel.loadbalancer; + +import com.velocitypowered.api.proxy.ProxyServer; +import com.velocitypowered.api.proxy.server.RegisteredServer; +import java.util.ArrayList; +import java.util.List; +import java.util.Objects; +import java.util.stream.Collectors; +import lombok.Getter; +import lombok.RequiredArgsConstructor; + +@Getter +@RequiredArgsConstructor +public class LoadBalancer { + + private final ProxyServer proxy; + private final RegisteredServer server; + private final LoadBalancingStrategy strategy; + private final String replicaSetUid; + + private final List endpointServers = new ArrayList<>(); + + public void addEndpoint(String serverName) { + if (!endpointServers.contains(serverName)) { + endpointServers.add(serverName); + } + } + + public void removeEndpoint(String serverName) { + endpointServers.remove(serverName); + } + + public void setEndpoints(List endpoints) { + endpointServers.clear(); + endpointServers.addAll(endpoints); + } + + public RegisteredServer getTarget() { + List servers = + endpointServers.stream() + .map(name -> proxy.getServer(name).orElse(null)) + .filter(Objects::nonNull) + .collect(Collectors.toList()); + + return strategy.choose(servers); + } + + // public List getTargets(int count) { + // List servers = + // endpointServers.stream() + // .map(name -> proxy.getServer(name).orElse(null)) + // .filter(Objects::nonNull) + // .collect(Collectors.toList()); + // + // return strategy.choose(servers, count); + // } +} diff --git a/src/main/java/net/azisaba/kuvel/loadbalancer/LoadBalancingStrategy.java b/src/main/java/net/azisaba/kuvel/loadbalancer/LoadBalancingStrategy.java new file mode 100644 index 00000000..087a3709 --- /dev/null +++ b/src/main/java/net/azisaba/kuvel/loadbalancer/LoadBalancingStrategy.java @@ -0,0 +1,11 @@ +package net.azisaba.kuvel.loadbalancer; + +import com.velocitypowered.api.proxy.server.RegisteredServer; +import java.util.List; + +public interface LoadBalancingStrategy { + + RegisteredServer choose(List servers); + + // List choose(List servers, int count); +} diff --git a/src/main/java/net/azisaba/kuvel/loadbalancer/VirtualLoadBalancerContainer.java b/src/main/java/net/azisaba/kuvel/loadbalancer/VirtualLoadBalancerContainer.java new file mode 100644 index 00000000..7209e388 --- /dev/null +++ b/src/main/java/net/azisaba/kuvel/loadbalancer/VirtualLoadBalancerContainer.java @@ -0,0 +1,13 @@ +package net.azisaba.kuvel.loadbalancer; + +import java.util.ArrayList; +import java.util.List; + +public class VirtualLoadBalancerContainer { + + private final List servers = new ArrayList<>(); + + public void addServer(LoadBalancer server) { + servers.add(server); + } +} diff --git a/src/main/java/net/azisaba/kuvel/loadbalancer/strategy/impl/MinimumPlayerLoadBalancingStrategy.java b/src/main/java/net/azisaba/kuvel/loadbalancer/strategy/impl/MinimumPlayerLoadBalancingStrategy.java new file mode 100644 index 00000000..26f80e77 --- /dev/null +++ b/src/main/java/net/azisaba/kuvel/loadbalancer/strategy/impl/MinimumPlayerLoadBalancingStrategy.java @@ -0,0 +1,54 @@ +package net.azisaba.kuvel.loadbalancer.strategy.impl; + +import com.velocitypowered.api.proxy.server.RegisteredServer; +import java.util.Comparator; +import java.util.List; +import net.azisaba.kuvel.loadbalancer.LoadBalancingStrategy; + +public class MinimumPlayerLoadBalancingStrategy implements LoadBalancingStrategy { + + @Override + public RegisteredServer choose(List servers) { + if (servers.isEmpty()) { + return null; + } + + return servers.stream() + .min(Comparator.comparingInt(a -> a.getPlayersConnected().size())) + .orElse(null); + } + + // @Override + // public List choose(List servers, int count) { + // List chosenServers = new ArrayList<>(); + // HashMap addedPlayerCount = new HashMap<>(); + // + // for (int i = 0; i < count; i++) { + // RegisteredServer server = + // servers.stream() + // .min( + // (server1, server2) -> { + // int server1Count = + // server1.getPlayersConnected().size() + // + addedPlayerCount.getOrDefault(server1.getServerInfo().getName(), + // 0); + // int server2Count = + // server2.getPlayersConnected().size() + // + addedPlayerCount.getOrDefault(server2.getServerInfo().getName(), + // 0); + // return server1Count - server2Count; + // }) + // .orElse(null); + // if (server == null) { + // throw new IllegalStateException("No server found"); + // } + // + // chosenServers.add(server); + // addedPlayerCount.put( + // server.getServerInfo().getName(), + // addedPlayerCount.getOrDefault(server.getServerInfo().getName(), 0) + 1); + // } + // + // return chosenServers; + // } +} diff --git a/src/main/java/net/azisaba/kuvel/loadbalancer/strategy/impl/RoundRobinLoadBalancingStrategy.java b/src/main/java/net/azisaba/kuvel/loadbalancer/strategy/impl/RoundRobinLoadBalancingStrategy.java new file mode 100644 index 00000000..3b74490d --- /dev/null +++ b/src/main/java/net/azisaba/kuvel/loadbalancer/strategy/impl/RoundRobinLoadBalancingStrategy.java @@ -0,0 +1,34 @@ +package net.azisaba.kuvel.loadbalancer.strategy.impl; + +import com.velocitypowered.api.proxy.server.RegisteredServer; +import java.util.List; +import net.azisaba.kuvel.loadbalancer.LoadBalancingStrategy; + +public class RoundRobinLoadBalancingStrategy implements LoadBalancingStrategy { + + private int lastIndex = 0; + + @Override + public RegisteredServer choose(List servers) { + if (servers.isEmpty()) { + return null; + } + + lastIndex++; + if (servers.size() <= lastIndex) { + lastIndex = 0; + return servers.get(0); + } + return servers.get(lastIndex); + } + + // @Override + // public List choose(List servers, int count) { + // List chosenServers = new ArrayList<>(); + // for (int i = 0; i < count; i++) { + // chosenServers.add(choose(servers)); + // } + // + // return chosenServers; + // } +} diff --git a/src/main/java/net/azisaba/kuvel/redis/ProxyIdProvider.java b/src/main/java/net/azisaba/kuvel/redis/ProxyIdProvider.java new file mode 100644 index 00000000..e5529173 --- /dev/null +++ b/src/main/java/net/azisaba/kuvel/redis/ProxyIdProvider.java @@ -0,0 +1,59 @@ +package net.azisaba.kuvel.redis; + +import com.velocitypowered.api.proxy.ProxyServer; +import java.util.concurrent.TimeUnit; +import lombok.RequiredArgsConstructor; +import org.apache.commons.lang3.RandomStringUtils; +import redis.clients.jedis.Jedis; +import redis.clients.jedis.JedisPool; + +@RequiredArgsConstructor +public class ProxyIdProvider { + + private final JedisPool jedisPool; + private final String groupName; + + private String id; + + public String getId() { + if (id == null) { + String idTmp = RandomStringUtils.randomAlphanumeric(8); + + try (Jedis jedis = jedisPool.getResource()) { + while (true) { + String key = RedisKeys.PROXY_ID_PREFIX.getKey() + groupName + ":" + idTmp; + long result = jedis.setnx(key, "true"); + + if (result == 1) { + jedis.expire(key, 600); + id = idTmp; + break; + } + + idTmp = RandomStringUtils.randomAlphanumeric(8); + } + } + } + return id; + } + + public void runTask(ProxyServer proxy, Object plugin) { + proxy + .getScheduler() + .buildTask( + plugin, + () -> { + try (Jedis jedis = jedisPool.getResource()) { + jedis.expire(RedisKeys.PROXY_ID_PREFIX.getKey() + groupName + ":" + id, 600); + } + }) + .repeat(5, TimeUnit.MINUTES) + .schedule(); + } + + public void deleteProxyId() { + try (Jedis jedis = jedisPool.getResource()) { + jedis.del(RedisKeys.PROXY_ID_PREFIX.getKey() + groupName + ":" + id); + } + } +} diff --git a/src/main/java/net/azisaba/kuvel/redis/RedisConnectionLeader.java b/src/main/java/net/azisaba/kuvel/redis/RedisConnectionLeader.java new file mode 100644 index 00000000..fd1bffc2 --- /dev/null +++ b/src/main/java/net/azisaba/kuvel/redis/RedisConnectionLeader.java @@ -0,0 +1,95 @@ +package net.azisaba.kuvel.redis; + +import java.util.Objects; +import lombok.RequiredArgsConstructor; +import redis.clients.jedis.Jedis; +import redis.clients.jedis.JedisPool; + +@RequiredArgsConstructor +public class RedisConnectionLeader { + + private final JedisPool jedisPool; + private final String groupName; + private final String proxyId; + + private boolean leader = false; + private long leaderExpireAt = 0; + + public boolean isLeader() { + if (leader && leaderExpireAt < System.currentTimeMillis()) { + leader = false; + } + return leader; + } + + public boolean trySwitch() { + try (Jedis jedis = jedisPool.getResource()) { + String key = RedisKeys.LEADER_PREFIX.getKey() + groupName; + long result = jedis.setnx(key, proxyId); + + if (result == 1) { + jedis.expire(key, 600); + leader = true; + leaderExpireAt = System.currentTimeMillis() + (600 * 1000); + return true; + } else { + String currentLeader = jedis.get(RedisKeys.LEADER_PREFIX.getKey() + groupName); + if (Objects.equals(proxyId, currentLeader)) { + leader = true; + return true; + } + return false; + } + } + } + + public void extendLeader() { + if (!trySwitch()) { + return; + } + + try (Jedis jedis = jedisPool.getResource()) { + jedis.expire(RedisKeys.LEADER_PREFIX.getKey() + groupName, 600); + leaderExpireAt = System.currentTimeMillis() + (600 * 1000); + } + } + + public void leaveLeader() { + try (Jedis jedis = jedisPool.getResource()) { + String currentLeader = jedis.get(RedisKeys.LEADER_PREFIX.getKey() + groupName); + if (!Objects.equals(proxyId, currentLeader)) { + return; + } + + jedis.del(RedisKeys.LEADER_PREFIX.getKey() + groupName); + } + } + + public void publishNewLoadBalancer(String replicaSetUid, String serverName) { + try (Jedis jedis = jedisPool.getResource()) { + jedis.publish( + RedisKeys.LOAD_BALANCER_ADDED_NOTIFY_PREFIX.getKey() + groupName, + replicaSetUid + ":" + serverName); + } + } + + public void publishNewServer(String podUid, String serverName) { + try (Jedis jedis = jedisPool.getResource()) { + jedis.publish( + RedisKeys.POD_ADDED_NOTIFY_PREFIX.getKey() + groupName, podUid + ":" + serverName); + } + } + + public void publishDeletedLoadBalancer(String replicaSetUid) { + try (Jedis jedis = jedisPool.getResource()) { + jedis.publish( + RedisKeys.LOAD_BALANCER_DELETED_NOTIFY_PREFIX.getKey() + groupName, replicaSetUid); + } + } + + public void publishDeletedServer(String podUid) { + try (Jedis jedis = jedisPool.getResource()) { + jedis.publish(RedisKeys.POD_DELETED_NOTIFY_PREFIX.getKey() + groupName, podUid); + } + } +} diff --git a/src/main/java/net/azisaba/kuvel/redis/RedisKeys.java b/src/main/java/net/azisaba/kuvel/redis/RedisKeys.java new file mode 100644 index 00000000..90290eb8 --- /dev/null +++ b/src/main/java/net/azisaba/kuvel/redis/RedisKeys.java @@ -0,0 +1,29 @@ +package net.azisaba.kuvel.redis; + +import lombok.AccessLevel; +import lombok.RequiredArgsConstructor; + +@RequiredArgsConstructor(access = AccessLevel.PRIVATE) +public enum RedisKeys { + LEADER_PREFIX("kuvel:leader:"), + PROXY_ID_PREFIX("kuvel:proxy-id:"), + SERVERS_PREFIX("kuvel:servers:"), + LOAD_BALANCERS_PREFIX("kuvel:load-balancers:"), + + NOTIFY_CHANNEL_PREFIX("kuvel:notify:"), + POD_ADDED_NOTIFY_PREFIX("kuvel:notify:add:pod:"), + LOAD_BALANCER_ADDED_NOTIFY_PREFIX("kuvel:notify:add:lb:"), + POD_DELETED_NOTIFY_PREFIX("kuvel:notify:del:pod:"), + LOAD_BALANCER_DELETED_NOTIFY_PREFIX("kuvel:notify:del:lb:"); + + private final String key; + + public String getKey() { + return key; + } + + @Override + public String toString() { + return getKey(); + } +} diff --git a/src/main/java/net/azisaba/kuvel/redis/RedisSubscriber.java b/src/main/java/net/azisaba/kuvel/redis/RedisSubscriber.java new file mode 100644 index 00000000..3cd8a391 --- /dev/null +++ b/src/main/java/net/azisaba/kuvel/redis/RedisSubscriber.java @@ -0,0 +1,100 @@ +package net.azisaba.kuvel.redis; + +import com.velocitypowered.api.proxy.server.RegisteredServer; +import com.velocitypowered.api.proxy.server.ServerInfo; +import java.net.InetSocketAddress; +import java.util.concurrent.ExecutorService; +import java.util.concurrent.Executors; +import lombok.Getter; +import lombok.RequiredArgsConstructor; +import lombok.Setter; +import net.azisaba.kuvel.Kuvel; +import net.azisaba.kuvel.KuvelServiceHandler; +import net.azisaba.kuvel.loadbalancer.LoadBalancer; +import net.azisaba.kuvel.loadbalancer.strategy.impl.RoundRobinLoadBalancingStrategy; +import redis.clients.jedis.Jedis; +import redis.clients.jedis.JedisPool; +import redis.clients.jedis.JedisPubSub; + +@RequiredArgsConstructor +public class RedisSubscriber { + + private final JedisPool jedisPool; + private final Kuvel plugin; + private final String groupName; + private final KuvelServiceHandler handler; + private final RedisConnectionLeader redisConnectionLeader; + + @Getter @Setter private ExecutorService executorService = Executors.newFixedThreadPool(1); + + public void subscribe() { + JedisPubSub subscriber = + new JedisPubSub() { + @Override + public void onPMessage(String pattern, String channel, String message) { + if (redisConnectionLeader.isLeader()) { + return; + } + + String receivedGroupName = channel.split(":")[channel.split(":").length - 1]; + if (!receivedGroupName.equalsIgnoreCase(groupName)) { + return; + } + + if (channel.startsWith(RedisKeys.POD_ADDED_NOTIFY_PREFIX.getKey())) { + String podUid = message.split(":")[0]; + String serverName = message.split(":")[1]; + + handler.registerPod(podUid, serverName); + } else if (channel.startsWith(RedisKeys.LOAD_BALANCER_ADDED_NOTIFY_PREFIX.getKey())) { + String replicaSetUid = message.split(":")[0]; + String serverName = message.split(":")[1]; + + RegisteredServer server = + plugin + .getProxy() + .registerServer( + new ServerInfo(serverName, new InetSocketAddress("0.0.0.0", 0))); + LoadBalancer loadBalancer = + new LoadBalancer( + plugin.getProxy(), + server, + new RoundRobinLoadBalancingStrategy(), + replicaSetUid); + handler.registerLoadBalancer(loadBalancer); + } else if (channel.startsWith(RedisKeys.POD_DELETED_NOTIFY_PREFIX.getKey())) { + handler.unregisterPod(message); + } else if (channel.startsWith(RedisKeys.LOAD_BALANCER_DELETED_NOTIFY_PREFIX.getKey())) { + handler.unregisterLoadBalancer(message); + } + } + }; + + Runnable task = + () -> { + try (Jedis jedis = jedisPool.getResource()) { + jedis.psubscribe( + subscriber, RedisKeys.NOTIFY_CHANNEL_PREFIX.getKey() + "*:" + groupName); + } + }; + + runsOnExecutor(executorService, task); + } + + public void runsOnExecutor(ExecutorService executor, Runnable runnable) { + executor.submit(runnable); + + for (int i = 0; i < 1000; i++) { + executor.submit( + () -> { + try { + Thread.sleep(3000); + } catch (InterruptedException e) { + Thread.currentThread().interrupt(); + } + + runnable.run(); + }); + } + } +} diff --git a/src/main/java/net/azisaba/kuvel/util/LabelKeys.java b/src/main/java/net/azisaba/kuvel/util/LabelKeys.java new file mode 100644 index 00000000..e3a20c9d --- /dev/null +++ b/src/main/java/net/azisaba/kuvel/util/LabelKeys.java @@ -0,0 +1,18 @@ +package net.azisaba.kuvel.util; + +import lombok.AccessLevel; +import lombok.Getter; +import lombok.RequiredArgsConstructor; + +@RequiredArgsConstructor(access = AccessLevel.PRIVATE) +public enum LabelKeys { + SERVER_DISCOVERY("minecraftServiceDiscovery"), + SERVER_NAME("minecraftServerName"); + + @Getter private final String key; + + @Override + public String toString() { + return getKey(); + } +} diff --git a/src/main/java/net/azisaba/kuvel/util/RedisConnectionData.java b/src/main/java/net/azisaba/kuvel/util/RedisConnectionData.java new file mode 100644 index 00000000..e3f23e13 --- /dev/null +++ b/src/main/java/net/azisaba/kuvel/util/RedisConnectionData.java @@ -0,0 +1,51 @@ +package net.azisaba.kuvel.util; + +import java.util.Objects; +import lombok.Data; +import redis.clients.jedis.JedisPool; +import redis.clients.jedis.JedisPoolConfig; + +@Data +public class RedisConnectionData { + + private final String hostname; + private final int port; + + private final String username; + private final String password; + + public RedisConnectionData(String hostname, int port, String username, String password) { + if (Objects.equals(username, "")) { + username = null; + } + if (Objects.equals(password, "")) { + password = null; + } + + this.hostname = hostname; + this.port = port; + this.username = username; + this.password = password; + } + + public RedisConnectionData(String hostname, int port) { + this(hostname, port, null, null); + } + + public RedisConnectionData(String hostname, int port, String password) { + this(hostname, port, null, password); + } + + public JedisPool createJedisPool() { + if (username != null && password != null) { + return new JedisPool(hostname, port, username, password); + } else if (password != null) { + return new JedisPool(new JedisPoolConfig(), hostname, port, 3000, password); + } else if (username != null) { + throw new IllegalArgumentException( + "Redis password cannot be null if redis username is not null"); + } else { + return new JedisPool(new JedisPoolConfig(), hostname, port); + } + } +} diff --git a/src/main/java/net/azisaba/kuvel/util/UidAndServerNameMap.java b/src/main/java/net/azisaba/kuvel/util/UidAndServerNameMap.java new file mode 100644 index 00000000..3af56da6 --- /dev/null +++ b/src/main/java/net/azisaba/kuvel/util/UidAndServerNameMap.java @@ -0,0 +1,34 @@ +package net.azisaba.kuvel.util; + +import java.util.HashMap; +import java.util.Map; + +public class UidAndServerNameMap { + + private final HashMap uidToServerName = new HashMap<>(); + + public String getServerNameFromUid(String podUid) { + return uidToServerName.get(podUid); + } + + public String getUidFromServerName(String serverName) { + for (String podUid : uidToServerName.keySet()) { + if (uidToServerName.get(podUid).equals(serverName)) { + return podUid; + } + } + return null; + } + + public Map getAllMap() { + return new HashMap<>(uidToServerName); + } + + public void register(String uid, String serverName) { + uidToServerName.put(uid, serverName); + } + + public String unregister(String uid) { + return uidToServerName.remove(uid); + } +} diff --git a/src/main/resources/config.yml b/src/main/resources/config.yml new file mode 100644 index 00000000..7bc716d6 --- /dev/null +++ b/src/main/resources/config.yml @@ -0,0 +1,11 @@ +# Server name synchronization by Redis is required in load-balanced environments using multiple Velocity. +redis: + enable: false + group-name: "production" + connection: + hostname: "localhost" + port: 6379 + # username is optional. if you have authentication enabled, you can use it here. Or leave it blank or null. + username: "root" + # password is optional. if you have authentication enabled, you can use it here. Or leave it blank or null. + password: "password" \ No newline at end of file