forked from public-mirrors/HuskSync
Introduce new lockstep syncing system, modularize sync modes (#178)
* Start work on modular sync systems * Add experimental lockstep sync system, close #69 * Refactor RedisMessageType enum * Fixup lockstep syncing * Bump to 3.1 * Update docs with details about the new Sync Modes * Sync mode config key is `mode` instead of `type` * Add server to data snapshot overview * API: Add API for setting data syncers * Fixup weird statistic matching logicfeat/data-edit-commands
William
1 year ago
committed by
GitHub
parent
03ca335293
commit
cae17f6e68
@ -0,0 +1,77 @@
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/*
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* This file is part of HuskSync, licensed under the Apache License 2.0.
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*
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* Copyright (c) William278 <will27528@gmail.com>
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* Copyright (c) contributors
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package net.william278.husksync.config;
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import net.william278.annotaml.YamlFile;
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import net.william278.annotaml.YamlKey;
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import org.jetbrains.annotations.NotNull;
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import java.nio.file.Path;
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/**
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* Represents a server on a proxied network.
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*/
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@YamlFile(header = """
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┏━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┓
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┃ HuskSync Server ID config ┃
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┃ Developed by William278 ┃
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┣━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┛
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┣╸ This file should contain the ID of this server as defined in your proxy config.
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┗╸ If you join it using /server alpha, then set it to 'alpha' (case-sensitive)""")
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public class Server {
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/**
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* Default server identifier.
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*/
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@NotNull
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public static String getDefaultServerName() {
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try {
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final Path serverDirectory = Path.of(System.getProperty("user.dir"));
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return serverDirectory.getFileName().toString().trim();
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} catch (Exception e) {
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return "server";
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}
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}
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@YamlKey("name")
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private String serverName = getDefaultServerName();
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@SuppressWarnings("unused")
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private Server() {
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}
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@Override
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public boolean equals(@NotNull Object other) {
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// If the name of this server matches another, the servers are the same.
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if (other instanceof Server server) {
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return server.getName().equalsIgnoreCase(this.getName());
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}
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return super.equals(other);
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}
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/**
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* Proxy-defined name of this server.
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*/
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@NotNull
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public String getName() {
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return serverName;
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}
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}
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@ -1,50 +0,0 @@
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/*
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* This file is part of HuskSync, licensed under the Apache License 2.0.
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*
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* Copyright (c) William278 <will27528@gmail.com>
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* Copyright (c) contributors
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package net.william278.husksync.redis;
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import org.jetbrains.annotations.NotNull;
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import java.util.Arrays;
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import java.util.Locale;
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import java.util.Optional;
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public enum RedisMessageType {
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UPDATE_USER_DATA,
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REQUEST_USER_DATA,
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RETURN_USER_DATA;
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@NotNull
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public String getMessageChannel(@NotNull String clusterId) {
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return String.format(
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"%s:%s:%s",
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RedisManager.KEY_NAMESPACE.toLowerCase(Locale.ENGLISH),
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clusterId.toLowerCase(Locale.ENGLISH),
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name().toLowerCase(Locale.ENGLISH)
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);
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}
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public static Optional<RedisMessageType> getTypeFromChannel(@NotNull String channel, @NotNull String clusterId) {
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return Arrays.stream(values())
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.filter(messageType -> messageType.getMessageChannel(clusterId).equalsIgnoreCase(channel))
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.findFirst();
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}
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}
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@ -0,0 +1,152 @@
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/*
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* This file is part of HuskSync, licensed under the Apache License 2.0.
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*
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* Copyright (c) William278 <will27528@gmail.com>
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* Copyright (c) contributors
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package net.william278.husksync.sync;
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import net.william278.husksync.HuskSync;
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import net.william278.husksync.api.HuskSyncAPI;
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import net.william278.husksync.data.DataSnapshot;
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import net.william278.husksync.user.OnlineUser;
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import net.william278.husksync.util.Task;
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import org.jetbrains.annotations.ApiStatus;
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import org.jetbrains.annotations.NotNull;
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import java.util.concurrent.atomic.AtomicLong;
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import java.util.concurrent.atomic.AtomicReference;
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import java.util.function.Function;
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import java.util.function.Supplier;
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/**
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* Handles the synchronization of data when a player changes servers or logs in
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*
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* @since 3.1
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*/
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public abstract class DataSyncer {
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private static final long BASE_LISTEN_ATTEMPTS = 16;
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private static final long LISTEN_DELAY = 10;
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protected final HuskSync plugin;
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private final long maxListenAttempts;
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@ApiStatus.Internal
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protected DataSyncer(@NotNull HuskSync plugin) {
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this.plugin = plugin;
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this.maxListenAttempts = getMaxListenAttempts();
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}
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/**
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* API-exposed constructor for a {@link DataSyncer}
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*
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* @param api instance of the {@link HuskSyncAPI}
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*/
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@SuppressWarnings("unused")
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public DataSyncer(@NotNull HuskSyncAPI api) {
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this(api.getPlugin());
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}
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/**
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* Called when the plugin is enabled
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*/
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public void initialize() {
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}
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/**
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* Called when the plugin is disabled
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*/
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public void terminate() {
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}
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/**
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* Called when a user's data should be fetched and applied to them
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*
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* @param user the user to fetch data for
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*/
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public abstract void setUserData(@NotNull OnlineUser user);
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/**
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* Called when a user's data should be serialized and saved
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*
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* @param user the user to save
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*/
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public abstract void saveUserData(@NotNull OnlineUser user);
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// Calculates the max attempts the system should listen for user data for based on the latency value
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private long getMaxListenAttempts() {
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return BASE_LISTEN_ATTEMPTS + (
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(Math.max(100, plugin.getSettings().getNetworkLatencyMilliseconds()) / 1000) * 20 / LISTEN_DELAY
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);
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}
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// Set a user's data from the database, or set them as a new user
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@ApiStatus.Internal
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protected void setUserFromDatabase(@NotNull OnlineUser user) {
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plugin.getDatabase().getLatestSnapshot(user).ifPresentOrElse(
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snapshot -> user.applySnapshot(snapshot, DataSnapshot.UpdateCause.SYNCHRONIZED),
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() -> user.completeSync(true, DataSnapshot.UpdateCause.NEW_USER, plugin)
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);
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}
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// Continuously listen for data from Redis
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@ApiStatus.Internal
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protected void listenForRedisData(@NotNull OnlineUser user, @NotNull Supplier<Boolean> completionSupplier) {
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final AtomicLong timesRun = new AtomicLong(0L);
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final AtomicReference<Task.Repeating> task = new AtomicReference<>();
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final Runnable runnable = () -> {
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if (user.isOffline()) {
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task.get().cancel();
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return;
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}
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if (plugin.isDisabling() || timesRun.getAndIncrement() > maxListenAttempts) {
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task.get().cancel();
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setUserFromDatabase(user);
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return;
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}
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if (completionSupplier.get()) {
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task.get().cancel();
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}
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};
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task.set(plugin.getRepeatingTask(runnable, LISTEN_DELAY));
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task.get().run();
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}
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/**
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* Represents the different available default modes of {@link DataSyncer}
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*
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* @since 3.1
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*/
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public enum Mode {
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DELAY(DelayDataSyncer::new),
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LOCKSTEP(LockstepDataSyncer::new);
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private final Function<HuskSync, ? extends DataSyncer> supplier;
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Mode(@NotNull Function<HuskSync, ? extends DataSyncer> supplier) {
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this.supplier = supplier;
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}
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@NotNull
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public DataSyncer create(@NotNull HuskSync plugin) {
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return supplier.apply(plugin);
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}
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}
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}
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@ -0,0 +1,69 @@
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/*
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* This file is part of HuskSync, licensed under the Apache License 2.0.
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*
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* Copyright (c) William278 <will27528@gmail.com>
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* Copyright (c) contributors
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|
*
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|
* Licensed under the Apache License, Version 2.0 (the "License");
|
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|
* you may not use this file except in compliance with the License.
|
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|
* You may obtain a copy of the License at
|
||||||
|
*
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|
* http://www.apache.org/licenses/LICENSE-2.0
|
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|
*
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|
* Unless required by applicable law or agreed to in writing, software
|
||||||
|
* distributed under the License is distributed on an "AS IS" BASIS,
|
||||||
|
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
||||||
|
* See the License for the specific language governing permissions and
|
||||||
|
* limitations under the License.
|
||||||
|
*/
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package net.william278.husksync.sync;
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import net.william278.husksync.HuskSync;
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import net.william278.husksync.data.DataSnapshot;
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import net.william278.husksync.user.OnlineUser;
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import org.jetbrains.annotations.NotNull;
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/**
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* A data syncer which applies a network delay before checking the presence of user data
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*/
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public class DelayDataSyncer extends DataSyncer {
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public DelayDataSyncer(@NotNull HuskSync plugin) {
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super(plugin);
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}
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@Override
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public void setUserData(@NotNull OnlineUser user) {
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|
plugin.runAsyncDelayed(
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|
() -> {
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// Fetch from the database if the user isn't changing servers
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if (!plugin.getRedisManager().getUserServerSwitch(user)) {
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this.setUserFromDatabase(user);
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return;
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|
}
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||||||
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// Listen for the data to be updated
|
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|
this.listenForRedisData(
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|
user,
|
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|
() -> plugin.getRedisManager().getUserData(user).map(data -> {
|
||||||
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user.applySnapshot(data, DataSnapshot.UpdateCause.SYNCHRONIZED);
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||||||
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return true;
|
||||||
|
}).orElse(false)
|
||||||
|
);
|
||||||
|
},
|
||||||
|
Math.max(0, plugin.getSettings().getNetworkLatencyMilliseconds() / 50L)
|
||||||
|
);
|
||||||
|
}
|
||||||
|
|
||||||
|
@Override
|
||||||
|
public void saveUserData(@NotNull OnlineUser user) {
|
||||||
|
plugin.runAsync(() -> {
|
||||||
|
plugin.getRedisManager().setUserServerSwitch(user);
|
||||||
|
final DataSnapshot.Packed data = user.createSnapshot(DataSnapshot.SaveCause.DISCONNECT);
|
||||||
|
plugin.getRedisManager().setUserData(user, data);
|
||||||
|
plugin.getDatabase().addSnapshot(user, data);
|
||||||
|
});
|
||||||
|
}
|
||||||
|
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||||||
|
}
|
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@ -0,0 +1,69 @@
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|||||||
|
/*
|
||||||
|
* This file is part of HuskSync, licensed under the Apache License 2.0.
|
||||||
|
*
|
||||||
|
* Copyright (c) William278 <will27528@gmail.com>
|
||||||
|
* Copyright (c) contributors
|
||||||
|
*
|
||||||
|
* Licensed under the Apache License, Version 2.0 (the "License");
|
||||||
|
* you may not use this file except in compliance with the License.
|
||||||
|
* You may obtain a copy of the License at
|
||||||
|
*
|
||||||
|
* http://www.apache.org/licenses/LICENSE-2.0
|
||||||
|
*
|
||||||
|
* Unless required by applicable law or agreed to in writing, software
|
||||||
|
* distributed under the License is distributed on an "AS IS" BASIS,
|
||||||
|
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
||||||
|
* See the License for the specific language governing permissions and
|
||||||
|
* limitations under the License.
|
||||||
|
*/
|
||||||
|
|
||||||
|
package net.william278.husksync.sync;
|
||||||
|
|
||||||
|
import net.william278.husksync.HuskSync;
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||||||
|
import net.william278.husksync.data.DataSnapshot;
|
||||||
|
import net.william278.husksync.user.OnlineUser;
|
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|
import org.jetbrains.annotations.NotNull;
|
||||||
|
|
||||||
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public class LockstepDataSyncer extends DataSyncer {
|
||||||
|
|
||||||
|
public LockstepDataSyncer(@NotNull HuskSync plugin) {
|
||||||
|
super(plugin);
|
||||||
|
}
|
||||||
|
|
||||||
|
@Override
|
||||||
|
public void initialize() {
|
||||||
|
plugin.getRedisManager().clearUsersCheckedOutOnServer();
|
||||||
|
}
|
||||||
|
|
||||||
|
@Override
|
||||||
|
public void terminate() {
|
||||||
|
plugin.getRedisManager().clearUsersCheckedOutOnServer();
|
||||||
|
}
|
||||||
|
|
||||||
|
// Consume their data when they are checked in
|
||||||
|
@Override
|
||||||
|
public void setUserData(@NotNull OnlineUser user) {
|
||||||
|
this.listenForRedisData(user, () -> {
|
||||||
|
if (plugin.getRedisManager().getUserCheckedOut(user).isEmpty()) {
|
||||||
|
plugin.getRedisManager().setUserCheckedOut(user, true);
|
||||||
|
plugin.getRedisManager().getUserData(user).ifPresentOrElse(
|
||||||
|
data -> user.applySnapshot(data, DataSnapshot.UpdateCause.SYNCHRONIZED),
|
||||||
|
() -> this.setUserFromDatabase(user)
|
||||||
|
);
|
||||||
|
return true;
|
||||||
|
}
|
||||||
|
return false;
|
||||||
|
});
|
||||||
|
}
|
||||||
|
|
||||||
|
@Override
|
||||||
|
public void saveUserData(@NotNull OnlineUser user) {
|
||||||
|
plugin.runAsync(() -> {
|
||||||
|
final DataSnapshot.Packed data = user.createSnapshot(DataSnapshot.SaveCause.DISCONNECT);
|
||||||
|
plugin.getRedisManager().setUserData(user, data);
|
||||||
|
plugin.getRedisManager().setUserCheckedOut(user, false);
|
||||||
|
plugin.getDatabase().addSnapshot(user, data);
|
||||||
|
});
|
||||||
|
}
|
||||||
|
|
||||||
|
}
|
||||||
@ -0,0 +1,44 @@
|
|||||||
|
HuskSync offers two built-in **synchronization modes**. These sync modes change the way data is synced between servers. This page details the two sync modes available and how they work.
|
||||||
|
|
||||||
|
* The `DELAY` sync mode is the default sync mode, that use the `network_latency_miliseconds` value to apply a delay before listening to Redis data
|
||||||
|
* The `LOCKSTEP` sync mode uses a data checkout system to ensure that all servers are in sync regardless of network latency or tick rate fluctuations. This mode was introduced in HuskSync v3.1
|
||||||
|
|
||||||
|
You can change which sync mode you are using by editing the `sync_mode` setting under `synchronization` in `config.yml`.
|
||||||
|
|
||||||
|
> **Warning:** Please note that you must use the same sync mode on all servers (at least within a cluster).
|
||||||
|
|
||||||
|
<details>
|
||||||
|
<summary>Changing the sync mode (config.yml)</summary>
|
||||||
|
|
||||||
|
```yaml
|
||||||
|
synchronization:
|
||||||
|
# The mode of data synchronization to use (DELAY or LOCKSTEP). DELAY should be fine for most networks. Docs: https://william278.net/docs/husksync/sync-modes
|
||||||
|
mode: DELAY
|
||||||
|
```
|
||||||
|
</details>
|
||||||
|
|
||||||
|
## Delay
|
||||||
|
|
||||||
|
|
||||||
|
The `DELAY` sync mode works as described below:
|
||||||
|
* When a user disconnects from a server, a `SERVER_SWITCH` key is immediately set on Redis, followed by a `DATA_UPDATE` key which contains the user's packed and serialized Data Snapshot.
|
||||||
|
* When the user connects to a server, they are marked as locked (unable to break blocks, use containers, etc.)
|
||||||
|
* The server asynchronously waits for the `network_latency_miliseconds` value (default: 500ms) to allow the source server time to serialize & set their key.
|
||||||
|
* After waiting, the server checks for the `SERVER_SWITCH` key.
|
||||||
|
* If present, it will continuously attempt to read for a `DATA_UPDATE` key; when read, their data will be set from the snapshot deserialized from Redis.
|
||||||
|
* If not present, their data will be pulled from the database (as though they joined the network)
|
||||||
|
|
||||||
|
`DELAY` has been the default sync mode since HuskSync v2.0. In HuskSync v3.1, `LOCKSTEP` was introduced. Since the delay mode has been tested and deployed for the longest, it is still the default, though note this may change in the future.
|
||||||
|
|
||||||
|
However, if your network has a fluctuating tick rate or significant latency (especially if you have servers on different hardware/locations), you may wish to use `LOCKSTEP` instead for a more reliable sync system.
|
||||||
|
|
||||||
|
## Lockstep
|
||||||
|
The `LOCKSTEP` sync mode works as described below:
|
||||||
|
* When a user connects to a server, the server will continuously asynchronously check if a `DATA_CHECKOUT` key is present.
|
||||||
|
* If, or when, the key is not present, the plugin will set a new `DATA_CHECKOUT` key.
|
||||||
|
* After this, the plugin will check Redis for the presence of a `DATA_UPDATE` key.
|
||||||
|
* If a `DATA_UPDATE` key is present, the user's data will be set from the snapshot deserialized from Redis contained within that key.
|
||||||
|
* Otherwise, their data will be pulled from the database.
|
||||||
|
* When a user disconnects from a server, their data is serialized and set to Redis with a `DATA_UPDATE` key. After this key has been set, the user's current `DATA_CHECKOUT` key will be removed from Redis.
|
||||||
|
|
||||||
|
Additionally, note that `DATA_CHECKOUT` keys are set with the server ID of the server which "checked out" the data (taken from the `server.yml` config file). On both shutdown and startup, the plugin will clear all `DATA_CHECKOUT` keys for the current server ID (to prevent stale keys in the event of a server crash for instance)
|
||||||
Loading…
Reference in New Issue