257 lines
10 KiB
C#
257 lines
10 KiB
C#
using System.Reactive.Linq;
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using System.Reactive.Subjects;
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using MoonlightServers.Daemon.Extensions;
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using MoonlightServers.Daemon.ServerSystem;
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using Stateless;
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namespace MoonlightServers.Daemon.ServerSys.Abstractions;
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public class Server : IAsyncDisposable
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{
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public IConsole Console { get; private set; }
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public IFileSystem FileSystem { get; private set; }
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public IInstaller Installer { get; private set; }
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public IProvisioner Provisioner { get; private set; }
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public IRestorer Restorer { get; private set; }
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public IStatistics Statistics { get; private set; }
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public StateMachine<ServerState, ServerTrigger> StateMachine { get; private set; }
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public ServerContext Context { get; private set; }
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public IAsyncObservable<ServerState> OnState => OnStateSubject.ToAsyncObservable();
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private readonly Subject<ServerState> OnStateSubject = new();
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private readonly ILogger<Server> Logger;
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private IAsyncDisposable? ProvisionExitSubscription;
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private IAsyncDisposable? InstallerExitSubscription;
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public Server(
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ILogger<Server> logger,
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IConsole console,
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IFileSystem fileSystem,
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IInstaller installer,
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IProvisioner provisioner,
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IRestorer restorer,
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IStatistics statistics,
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ServerContext context
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)
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{
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Logger = logger;
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Console = console;
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FileSystem = fileSystem;
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Installer = installer;
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Provisioner = provisioner;
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Restorer = restorer;
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Statistics = statistics;
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Context = context;
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}
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public async Task Initialize()
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{
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Logger.LogDebug("Initializing server components");
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IServerComponent[] components = [Console, Restorer, FileSystem, Installer, Provisioner, Statistics];
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foreach (var serverComponent in components)
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{
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try
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{
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await serverComponent.Initialize();
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}
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catch (Exception e)
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{
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Logger.LogError(
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e,
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"Error initializing server component: {type}",
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serverComponent.GetType().Name.GetType().FullName
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);
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throw;
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}
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}
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Logger.LogDebug("Restoring server");
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var restoredState = await Restorer.Restore();
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if (restoredState == ServerState.Offline)
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Logger.LogDebug("Restorer didnt find anything to restore. State is offline");
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else
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Logger.LogDebug("Restored server to state: {state}", restoredState);
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CreateStateMachine(restoredState);
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// Setup event handling
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ProvisionExitSubscription = await Provisioner.OnExited.SubscribeAsync(async o =>
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{
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await StateMachine.FireAsync(ServerTrigger.Exited);
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});
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InstallerExitSubscription = await Installer.OnExited.SubscribeAsync(async o =>
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{
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await StateMachine.FireAsync(ServerTrigger.Exited);
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});
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}
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private void CreateStateMachine(ServerState initialState)
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{
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StateMachine = new StateMachine<ServerState, ServerTrigger>(initialState, FiringMode.Queued);
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StateMachine.OnTransitioned(transition => OnStateSubject.OnNext(transition.Destination));
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// Configure basic state machine flow
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StateMachine.Configure(ServerState.Offline)
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.Permit(ServerTrigger.Start, ServerState.Starting)
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.Permit(ServerTrigger.Install, ServerState.Installing)
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.PermitReentry(ServerTrigger.FailSafe);
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StateMachine.Configure(ServerState.Starting)
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.Permit(ServerTrigger.OnlineDetected, ServerState.Online)
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.Permit(ServerTrigger.FailSafe, ServerState.Offline)
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.Permit(ServerTrigger.Exited, ServerState.Offline)
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.Permit(ServerTrigger.Stop, ServerState.Stopping)
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.Permit(ServerTrigger.Kill, ServerState.Stopping);
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StateMachine.Configure(ServerState.Online)
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.Permit(ServerTrigger.Stop, ServerState.Stopping)
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.Permit(ServerTrigger.Kill, ServerState.Stopping)
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.Permit(ServerTrigger.Exited, ServerState.Offline);
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StateMachine.Configure(ServerState.Stopping)
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.PermitReentry(ServerTrigger.FailSafe)
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.PermitReentry(ServerTrigger.Kill)
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.Permit(ServerTrigger.Exited, ServerState.Offline);
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StateMachine.Configure(ServerState.Installing)
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.Permit(ServerTrigger.FailSafe, ServerState.Offline) // TODO: Add kill
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.Permit(ServerTrigger.Exited, ServerState.Offline);
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// Handle transitions
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StateMachine.Configure(ServerState.Starting)
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.OnEntryAsync(HandleStart)
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.OnExitFromAsync(ServerTrigger.Exited, HandleRuntimeExit);
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StateMachine.Configure(ServerState.Installing)
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.OnEntryAsync(HandleInstall)
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.OnExitFromAsync(ServerTrigger.Exited, HandleInstallExit);
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StateMachine.Configure(ServerState.Online)
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.OnExitFromAsync(ServerTrigger.Exited, HandleRuntimeExit);
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StateMachine.Configure(ServerState.Stopping)
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.OnEntryFromAsync(ServerTrigger.Stop, HandleStop)
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.OnExitFromAsync(ServerTrigger.Exited, HandleRuntimeExit);
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}
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#region State machine handlers
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private async Task HandleStart()
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{
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try
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{
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// Plan for starting the server:
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// 1. Fetch latest configuration from panel (maybe: and perform sync)
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// 2. Ensure that the file system exists
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// 3. Mount the file system
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// 4. Provision the container
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// 5. Attach console to container
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// 6. Start the container
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// 1. Fetch latest configuration from panel
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// TODO: Implement
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// 2. Ensure that the file system exists
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if (!FileSystem.Exists)
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{
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await Console.WriteToMoonlight("Creating storage");
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await FileSystem.Create();
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}
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// 3. Mount the file system
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if (!FileSystem.IsMounted)
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{
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await Console.WriteToMoonlight("Mounting storage");
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await FileSystem.Mount();
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}
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// 4. Provision the container
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await Console.WriteToMoonlight("Provisioning runtime");
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await Provisioner.Provision();
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// 5. Attach console to container
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await Console.AttachToRuntime();
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// 6. Start the container
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await Provisioner.Start();
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}
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catch (Exception e)
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{
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Logger.LogError(e, "An error occured while starting the server");
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}
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}
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private async Task HandleStop()
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{
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await Provisioner.Stop();
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}
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private async Task HandleRuntimeExit()
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{
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Logger.LogDebug("Deprovisioning");
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await Console.WriteToMoonlight("Deprovisioning");
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await Provisioner.Deprovision();
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}
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private async Task HandleInstall()
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{
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Logger.LogDebug("Installing");
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Logger.LogDebug("Setting up");
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await Console.WriteToMoonlight("Setting up installation");
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// TODO: Extract to service
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Context.InstallConfiguration = new()
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{
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Shell = "/bin/ash",
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DockerImage = "ghcr.io/parkervcp/installers:alpine",
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Script =
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"#!/bin/ash\n# Paper Installation Script\n#\n# Server Files: /mnt/server\nPROJECT=paper\n\nif [ -n \"${DL_PATH}\" ]; then\n\techo -e \"Using supplied download url: ${DL_PATH}\"\n\tDOWNLOAD_URL=`eval echo $(echo ${DL_PATH} | sed -e 's/{{/${/g' -e 's/}}/}/g')`\nelse\n\tVER_EXISTS=`curl -s https://api.papermc.io/v2/projects/${PROJECT} | jq -r --arg VERSION $MINECRAFT_VERSION '.versions[] | contains($VERSION)' | grep -m1 true`\n\tLATEST_VERSION=`curl -s https://api.papermc.io/v2/projects/${PROJECT} | jq -r '.versions' | jq -r '.[-1]'`\n\n\tif [ \"${VER_EXISTS}\" == \"true\" ]; then\n\t\techo -e \"Version is valid. Using version ${MINECRAFT_VERSION}\"\n\telse\n\t\techo -e \"Specified version not found. Defaulting to the latest ${PROJECT} version\"\n\t\tMINECRAFT_VERSION=${LATEST_VERSION}\n\tfi\n\n\tBUILD_EXISTS=`curl -s https://api.papermc.io/v2/projects/${PROJECT}/versions/${MINECRAFT_VERSION} | jq -r --arg BUILD ${BUILD_NUMBER} '.builds[] | tostring | contains($BUILD)' | grep -m1 true`\n\tLATEST_BUILD=`curl -s https://api.papermc.io/v2/projects/${PROJECT}/versions/${MINECRAFT_VERSION} | jq -r '.builds' | jq -r '.[-1]'`\n\n\tif [ \"${BUILD_EXISTS}\" == \"true\" ]; then\n\t\techo -e \"Build is valid for version ${MINECRAFT_VERSION}. Using build ${BUILD_NUMBER}\"\n\telse\n\t\techo -e \"Using the latest ${PROJECT} build for version ${MINECRAFT_VERSION}\"\n\t\tBUILD_NUMBER=${LATEST_BUILD}\n\tfi\n\n\tJAR_NAME=${PROJECT}-${MINECRAFT_VERSION}-${BUILD_NUMBER}.jar\n\n\techo \"Version being downloaded\"\n\techo -e \"MC Version: ${MINECRAFT_VERSION}\"\n\techo -e \"Build: ${BUILD_NUMBER}\"\n\techo -e \"JAR Name of Build: ${JAR_NAME}\"\n\tDOWNLOAD_URL=https://api.papermc.io/v2/projects/${PROJECT}/versions/${MINECRAFT_VERSION}/builds/${BUILD_NUMBER}/downloads/${JAR_NAME}\nfi\n\ncd /mnt/server\n\necho -e \"Running curl -o ${SERVER_JARFILE} ${DOWNLOAD_URL}\"\n\nif [ -f ${SERVER_JARFILE} ]; then\n\tmv ${SERVER_JARFILE} ${SERVER_JARFILE}.old\nfi\n\ncurl -o ${SERVER_JARFILE} ${DOWNLOAD_URL}\n\nif [ ! -f server.properties ]; then\n echo -e \"Downloading MC server.properties\"\n curl -o server.properties https://raw.githubusercontent.com/parkervcp/eggs/master/minecraft/java/server.properties\nfi"
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};
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await Installer.Setup();
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await Console.AttachToInstallation();
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await Installer.Start();
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}
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private async Task HandleInstallExit()
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{
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Logger.LogDebug("Installation done");
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await Console.WriteToMoonlight("Cleaning up");
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await Installer.Cleanup();
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await Console.WriteToMoonlight("Installation completed");
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}
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#endregion
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public async ValueTask DisposeAsync()
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{
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if (ProvisionExitSubscription != null)
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await ProvisionExitSubscription.DisposeAsync();
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if (InstallerExitSubscription != null)
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await InstallerExitSubscription.DisposeAsync();
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await Console.DisposeAsync();
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await FileSystem.DisposeAsync();
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await Installer.DisposeAsync();
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await Provisioner.DisposeAsync();
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await Restorer.DisposeAsync();
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await Statistics.DisposeAsync();
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}
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} |