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192 lines
6.8 KiB
C#
192 lines
6.8 KiB
C#
using MediaBrowser.Common.Configuration;
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using MediaBrowser.Controller;
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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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using CommonIO;
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using Interfaces.IO;
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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 IServerApplicationHost _appHost;
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public TargetDataProvider(IServerSyncProvider provider, SyncTarget target, IServerApplicationHost appHost, 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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_appHost = appHost;
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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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_appHost.FriendlyName,
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"data.json"
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};
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parts = parts.Select(i => GetValidFilename(_provider, i)).ToList();
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return parts.ToArray();
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}
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private string GetValidFilename(IServerSyncProvider provider, string filename)
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{
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// We can always add this method to the sync provider if it's really needed
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return _fileSystem.GetValidFilename(filename);
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}
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private async Task<List<LocalItem>> RetrieveItems(CancellationToken cancellationToken)
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{
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_logger.Debug("Getting {0} from {1}", string.Join(MediaSync.PathSeparatorString, GetRemotePath().ToArray()), _provider.Name);
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var fileResult = await _provider.GetFiles(new FileQuery
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{
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FullPath = GetRemotePath().ToArray()
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}, _target, cancellationToken).ConfigureAwait(false);
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if (fileResult.Items.Length > 0)
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{
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using (var stream = await _provider.GetFile(fileResult.Items[0].Id, _target, new Progress<double>(), cancellationToken))
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{
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return _json.DeserializeFromStream<List<LocalItem>>(stream);
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}
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}
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return new List<LocalItem>();
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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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_items = await RetrieveItems(cancellationToken).ConfigureAwait(false);
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}
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}
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private async Task SaveData(List<LocalItem> items, 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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var remotePath = GetRemotePath();
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_logger.Debug("Saving data.json to {0}. Remote path: {1}", _provider.Name, string.Join("/", remotePath));
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await _provider.SendFile(stream, remotePath, _target, new Progress<double>(), cancellationToken).ConfigureAwait(false);
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}
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}
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private async Task<T> GetData<T>(bool enableCache, Func<List<LocalItem>, T> dataFactory)
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{
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if (!enableCache)
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{
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var items = await RetrieveItems(CancellationToken.None).ConfigureAwait(false);
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var newCache = items.ToList();
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var result = dataFactory(items);
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await UpdateCache(newCache).ConfigureAwait(false);
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return result;
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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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var items = await RetrieveItems(CancellationToken.None).ConfigureAwait(false);
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items = action(items);
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await SaveData(items.ToList(), CancellationToken.None).ConfigureAwait(false);
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await UpdateCache(null).ConfigureAwait(false);
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}
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private async Task UpdateCache(List<LocalItem> list)
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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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_items = list;
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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<LocalItem>> GetLocalItems(SyncTarget target, string serverId)
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{
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return GetData(false, items => items.Where(i => string.Equals(i.ServerId, serverId, StringComparison.OrdinalIgnoreCase)).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(true, items => items.FirstOrDefault(i => string.Equals(i.Id, id, StringComparison.OrdinalIgnoreCase)));
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}
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public Task<List<LocalItem>> GetItems(SyncTarget target, string serverId, string itemId)
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{
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return GetData(true, items => items.Where(i => string.Equals(i.ServerId, serverId, StringComparison.OrdinalIgnoreCase) && string.Equals(i.ItemId, itemId, StringComparison.OrdinalIgnoreCase)).ToList());
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}
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public Task<List<LocalItem>> GetItemsBySyncJobItemId(SyncTarget target, string serverId, string syncJobItemId)
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{
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return GetData(false, items => items.Where(i => string.Equals(i.ServerId, serverId, StringComparison.OrdinalIgnoreCase) && string.Equals(i.SyncJobItemId, syncJobItemId, StringComparison.OrdinalIgnoreCase)).ToList());
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}
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}
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}
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