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257 lines
9.0 KiB
257 lines
9.0 KiB
using System;
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using System.Collections.Generic;
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using System.Collections.Concurrent;
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using System.Linq;
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using System.Text;
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using System.Threading.Tasks;
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using System.Threading;
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using IPA.Utilities;
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using IPA.Utilities.Async;
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using System.IO;
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using System.Runtime.CompilerServices;
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using IPA.Logging;
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#if NET4
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using Task = System.Threading.Tasks.Task;
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using TaskEx = System.Threading.Tasks.Task;
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#endif
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namespace IPA.Config
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{
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internal static class ConfigRuntime
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{
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private class DirInfoEqComparer : IEqualityComparer<DirectoryInfo>
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{
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public bool Equals(DirectoryInfo x, DirectoryInfo y)
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=> x?.FullName == y?.FullName;
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public int GetHashCode(DirectoryInfo obj)
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=> obj?.GetHashCode() ?? 0;
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}
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private static readonly ConcurrentBag<Config> configs = new ConcurrentBag<Config>();
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private static readonly AutoResetEvent configsChangedWatcher = new AutoResetEvent(false);
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private static readonly ConcurrentDictionary<DirectoryInfo, FileSystemWatcher> watchers
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= new ConcurrentDictionary<DirectoryInfo, FileSystemWatcher>(new DirInfoEqComparer());
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private static readonly ConcurrentDictionary<FileSystemWatcher, ConcurrentBag<Config>> watcherTrackConfigs
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= new ConcurrentDictionary<FileSystemWatcher, ConcurrentBag<Config>>();
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private static SingleThreadTaskScheduler loadScheduler = null;
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private static TaskFactory loadFactory = null;
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private static Thread saveThread = null;
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private static void TryStartRuntime()
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{
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if (loadScheduler == null || !loadScheduler.IsRunning)
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{
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loadFactory = null;
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loadScheduler = new SingleThreadTaskScheduler();
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loadScheduler.Start();
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}
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if (loadFactory == null)
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loadFactory = new TaskFactory(loadScheduler);
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if (saveThread == null || !saveThread.IsAlive)
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{
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saveThread = new Thread(SaveThread);
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saveThread.Start();
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}
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AppDomain.CurrentDomain.ProcessExit -= ShutdownRuntime;
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AppDomain.CurrentDomain.ProcessExit += ShutdownRuntime;
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}
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private static void ShutdownRuntime(object sender, EventArgs e)
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{
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watcherTrackConfigs.Clear();
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var watchList = watchers.ToArray();
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watchers.Clear();
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foreach (var pair in watchList)
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pair.Value.EnableRaisingEvents = false;
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loadScheduler.Join(); // we can wait for the loads to finish
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saveThread.Abort(); // eww, but i don't like any of the other potential solutions
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SaveAll();
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}
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public static void RegisterConfig(Config cfg)
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{
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lock (configs)
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{ // we only lock this segment, so that this only waits on other calls to this
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if (configs.ToArray().Contains(cfg))
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throw new InvalidOperationException("Config already registered to runtime!");
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configs.Add(cfg);
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}
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configsChangedWatcher.Set();
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TryStartRuntime();
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AddConfigToWatchers(cfg);
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}
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public static void ConfigChanged()
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{
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configsChangedWatcher.Set();
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}
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private static void AddConfigToWatchers(Config config)
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{
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var dir = config.File.Directory;
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if (!watchers.TryGetValue(dir, out var watcher))
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{ // create the watcher
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watcher = new FileSystemWatcher(dir.FullName, "");
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var newWatcher = watchers.GetOrAdd(dir, watcher);
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if (watcher != newWatcher)
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{ // if someone else beat us to adding, delete ours and switch to that new one
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watcher.Dispose();
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watcher = newWatcher;
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}
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watcher.NotifyFilter =
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NotifyFilters.FileName
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| NotifyFilters.LastWrite;
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watcher.Changed += FileChangedEvent;
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watcher.Created += FileChangedEvent;
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watcher.Renamed += FileChangedEvent;
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watcher.Deleted += FileChangedEvent;
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}
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TryStartRuntime();
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watcher.EnableRaisingEvents = false; // disable while we do shit
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var bag = watcherTrackConfigs.GetOrAdd(watcher, w => new ConcurrentBag<Config>());
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// we don't need to check containment because this function will only be called once per config ever
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bag.Add(config);
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watcher.EnableRaisingEvents = true;
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}
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private static void EnsureWritesSane(Config config)
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{
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// compare exchange loop to be sane
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var writes = config.Writes;
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while (writes < 0)
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writes = Interlocked.CompareExchange(ref config.Writes, 0, writes);
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}
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private static void FileChangedEvent(object sender, FileSystemEventArgs e)
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{
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var watcher = sender as FileSystemWatcher;
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if (!watcherTrackConfigs.TryGetValue(watcher, out var bag)) return;
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var config = bag.FirstOrDefault(c => c.File.FullName == e.FullPath);
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if (config != null && Interlocked.Decrement(ref config.Writes) + 1 > 0)
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{
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EnsureWritesSane(config);
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TriggerFileLoad(config);
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}
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}
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public static Task TriggerFileLoad(Config config) => loadFactory.StartNew(() => LoadTask(config));
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public static Task TriggerLoadAll() =>
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TaskEx.WhenAll(configs.Select(TriggerFileLoad));
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/// <summary>
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/// this is synchronous, unlike <see cref="TriggerFileLoad(Config)"/>
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/// </summary>
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/// <param name="config"></param>
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public static void Save(Config config)
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{
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var store = config.Store;
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try
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{
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using var readLock = Synchronization.LockRead(store.WriteSyncObject);
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lock (config.Provider)
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{
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config.Provider.File = config.File;
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EnsureWritesSane(config);
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Interlocked.Increment(ref config.Writes);
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store.WriteTo(config.Provider);
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}
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}
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catch (ThreadAbortException)
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{
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throw;
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}
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catch (Exception e)
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{
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Logger.config.Error($"{nameof(IConfigStore)} for {config.File} errored while writing to disk");
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Logger.config.Error(e);
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}
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}
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/// <summary>
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/// this is synchronous, unlike <see cref="TriggerLoadAll"/>
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/// </summary>
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public static void SaveAll()
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{
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foreach (var config in configs)
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Save(config);
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}
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private static void LoadTask(Config config)
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{ // these tasks will always be running in the same thread as each other
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try
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{
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var store = config.Store;
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using var writeLock = Synchronization.LockWrite(store.WriteSyncObject);
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lock (config.Provider)
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{
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config.Provider.File = config.File;
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store.ReadFrom(config.Provider);
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}
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}
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catch (Exception e)
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{
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Logger.config.Error($"{nameof(IConfigStore)} for {config.File} errored while reading from the {nameof(IConfigProvider)}");
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Logger.config.Error(e);
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}
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}
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private static void SaveThread()
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{
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try
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{
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while (true)
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{
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var configArr = configs.Where(c => c.Store != null).ToArray();
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int index = -1;
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try
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{
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var waitHandles = configArr.Select(c => c.Store.SyncObject)
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.Prepend(configsChangedWatcher)
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.ToArray();
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index = WaitHandle.WaitAny(waitHandles);
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}
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catch (ThreadAbortException)
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{
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break;
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}
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catch (Exception e)
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{
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Logger.config.Error($"Error waiting for in-memory updates");
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Logger.config.Error(e);
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Thread.Sleep(TimeSpan.FromSeconds(1));
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}
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if (index <= 0)
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{ // we got a signal that the configs collection changed, loop around, or errored
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continue;
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}
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// otherwise, we have a thing that changed in a store
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Save(configArr[index - 1]);
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}
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}
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catch (ThreadAbortException)
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{
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// we got aborted :(
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}
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}
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}
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}
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