2015-03-08 05:44:31 +01:00
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using MediaBrowser.Common.Configuration;
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using MediaBrowser.Common.Extensions;
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using MediaBrowser.Common.IO;
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using MediaBrowser.Controller.Sync;
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using MediaBrowser.Model.Logging;
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using MediaBrowser.Model.Serialization;
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using MediaBrowser.Model.Sync;
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using System;
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using System.Collections.Generic;
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using System.IO;
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using System.Linq;
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using System.Threading;
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using System.Threading.Tasks;
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namespace MediaBrowser.Server.Implementations.Sync
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{
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public class TargetDataProvider : ISyncDataProvider
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{
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private readonly SyncTarget _target;
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private readonly IServerSyncProvider _provider;
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private readonly SemaphoreSlim _dataLock = new SemaphoreSlim(1, 1);
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private List<LocalItem> _items;
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private readonly ILogger _logger;
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private readonly IJsonSerializer _json;
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private readonly IFileSystem _fileSystem;
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private readonly IApplicationPaths _appPaths;
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private readonly string _serverId;
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private readonly SemaphoreSlim _cacheFileLock = new SemaphoreSlim(1, 1);
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public TargetDataProvider(IServerSyncProvider provider, SyncTarget target, string serverId, ILogger logger, IJsonSerializer json, IFileSystem fileSystem, IApplicationPaths appPaths)
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{
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_logger = logger;
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_json = json;
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_provider = provider;
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_target = target;
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_fileSystem = fileSystem;
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_appPaths = appPaths;
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_serverId = serverId;
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}
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private string GetCachePath()
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{
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return Path.Combine(_appPaths.DataPath, "sync", _target.Id.GetMD5().ToString("N") + ".json");
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}
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private string GetRemotePath()
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{
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var parts = new List<string>
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{
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_serverId,
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"data.json"
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};
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return _provider.GetFullPath(parts, _target);
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}
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private async Task CacheData(Stream stream)
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{
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var cachePath = GetCachePath();
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await _cacheFileLock.WaitAsync().ConfigureAwait(false);
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try
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{
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Directory.CreateDirectory(Path.GetDirectoryName(cachePath));
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using (var fileStream = _fileSystem.GetFileStream(cachePath, FileMode.Create, FileAccess.Write, FileShare.Read, true))
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{
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await stream.CopyToAsync(fileStream).ConfigureAwait(false);
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}
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}
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catch (Exception ex)
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{
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_logger.ErrorException("Error saving sync data to {0}", ex, cachePath);
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}
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finally
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{
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_cacheFileLock.Release();
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}
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}
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private async Task EnsureData(CancellationToken cancellationToken)
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{
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if (_items == null)
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{
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try
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{
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using (var stream = await _provider.GetFile(GetRemotePath(), _target, new Progress<double>(), cancellationToken))
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{
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_items = _json.DeserializeFromStream<List<LocalItem>>(stream);
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}
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}
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catch (FileNotFoundException)
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{
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_items = new List<LocalItem>();
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}
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catch (DirectoryNotFoundException)
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{
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_items = new List<LocalItem>();
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}
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using (var memoryStream = new MemoryStream())
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{
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_json.SerializeToStream(_items, memoryStream);
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// Now cache it
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memoryStream.Position = 0;
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await CacheData(memoryStream).ConfigureAwait(false);
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}
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}
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}
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private async Task SaveData(CancellationToken cancellationToken)
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{
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using (var stream = new MemoryStream())
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{
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_json.SerializeToStream(_items, stream);
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// Save to sync provider
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stream.Position = 0;
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await _provider.SendFile(stream, GetRemotePath(), _target, new Progress<double>(), cancellationToken).ConfigureAwait(false);
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// Now cache it
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stream.Position = 0;
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await CacheData(stream).ConfigureAwait(false);
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}
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}
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private async Task<T> GetData<T>(Func<List<LocalItem>, T> dataFactory)
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{
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await _dataLock.WaitAsync().ConfigureAwait(false);
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try
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{
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await EnsureData(CancellationToken.None).ConfigureAwait(false);
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return dataFactory(_items);
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}
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finally
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{
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_dataLock.Release();
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}
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}
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private async Task UpdateData(Func<List<LocalItem>, List<LocalItem>> action)
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{
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await _dataLock.WaitAsync().ConfigureAwait(false);
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try
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{
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await EnsureData(CancellationToken.None).ConfigureAwait(false);
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_items = action(_items);
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await SaveData(CancellationToken.None).ConfigureAwait(false);
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}
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finally
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{
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_dataLock.Release();
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}
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}
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public Task<List<string>> GetServerItemIds(SyncTarget target, string serverId)
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{
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return GetData(items => items.Where(i => string.Equals(i.ServerId, serverId, StringComparison.OrdinalIgnoreCase)).Select(i => i.ItemId).ToList());
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}
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public Task AddOrUpdate(SyncTarget target, LocalItem item)
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{
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return UpdateData(items =>
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{
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var list = items.Where(i => !string.Equals(i.Id, item.Id, StringComparison.OrdinalIgnoreCase))
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.ToList();
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list.Add(item);
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return list;
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});
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}
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public Task Delete(SyncTarget target, string id)
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{
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return UpdateData(items => items.Where(i => !string.Equals(i.Id, id, StringComparison.OrdinalIgnoreCase)).ToList());
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}
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public Task<LocalItem> Get(SyncTarget target, string id)
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{
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return GetData(items => items.FirstOrDefault(i => string.Equals(i.Id, id, StringComparison.OrdinalIgnoreCase)));
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}
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private async Task<List<LocalItem>> GetCachedData()
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{
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if (_items == null)
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{
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await _cacheFileLock.WaitAsync().ConfigureAwait(false);
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try
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{
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if (_items == null)
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{
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try
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{
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_items = _json.DeserializeFromFile<List<LocalItem>>(GetCachePath());
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}
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catch (FileNotFoundException)
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{
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_items = new List<LocalItem>();
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}
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catch (DirectoryNotFoundException)
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{
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_items = new List<LocalItem>();
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}
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}
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}
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finally
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{
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_cacheFileLock.Release();
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}
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}
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return _items.ToList();
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}
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public async Task<List<string>> GetCachedServerItemIds(SyncTarget target, string serverId)
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{
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var items = await GetCachedData().ConfigureAwait(false);
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return items.Where(i => string.Equals(i.ServerId, serverId, StringComparison.OrdinalIgnoreCase))
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.Select(i => i.ItemId)
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.ToList();
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}
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2015-03-10 19:10:38 +01:00
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public async Task<List<LocalItem>> GetCachedItems(SyncTarget target, string serverId, string itemId)
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2015-03-08 05:44:31 +01:00
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{
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var items = await GetCachedData().ConfigureAwait(false);
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2015-03-10 19:10:38 +01:00
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return items.Where(i => string.Equals(i.ServerId, serverId, StringComparison.OrdinalIgnoreCase) && string.Equals(i.ItemId, itemId, StringComparison.OrdinalIgnoreCase))
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.ToList();
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2015-03-08 05:44:31 +01:00
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}
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}
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}
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