jellyfin-server/MediaBrowser.Server.Implementations/Persistence/SqliteItemRepository.cs
2013-10-01 14:24:27 -04:00

525 lines
17 KiB
C#

using MediaBrowser.Common.Configuration;
using MediaBrowser.Controller.Entities;
using MediaBrowser.Controller.Persistence;
using MediaBrowser.Model.Entities;
using MediaBrowser.Model.Logging;
using MediaBrowser.Model.Serialization;
using System;
using System.Collections.Generic;
using System.Data;
using System.IO;
using System.Linq;
using System.Threading;
using System.Threading.Tasks;
namespace MediaBrowser.Server.Implementations.Persistence
{
/// <summary>
/// Class SQLiteItemRepository
/// </summary>
public class SqliteItemRepository : IItemRepository
{
private IDbConnection _connection;
private readonly ILogger _logger;
private readonly TypeMapper _typeMapper = new TypeMapper();
/// <summary>
/// Gets the name of the repository
/// </summary>
/// <value>The name.</value>
public string Name
{
get
{
return "SQLite";
}
}
/// <summary>
/// Gets the json serializer.
/// </summary>
/// <value>The json serializer.</value>
private readonly IJsonSerializer _jsonSerializer;
/// <summary>
/// The _app paths
/// </summary>
private readonly IApplicationPaths _appPaths;
/// <summary>
/// The _save item command
/// </summary>
private IDbCommand _saveItemCommand;
private readonly string _criticReviewsPath;
private SqliteChapterRepository _chapterRepository;
private IDbCommand _deleteChildrenCommand;
private IDbCommand _saveChildrenCommand;
/// <summary>
/// Initializes a new instance of the <see cref="SqliteItemRepository"/> class.
/// </summary>
/// <param name="appPaths">The app paths.</param>
/// <param name="jsonSerializer">The json serializer.</param>
/// <param name="logManager">The log manager.</param>
/// <exception cref="System.ArgumentNullException">
/// appPaths
/// or
/// jsonSerializer
/// </exception>
public SqliteItemRepository(IApplicationPaths appPaths, IJsonSerializer jsonSerializer, ILogManager logManager)
{
if (appPaths == null)
{
throw new ArgumentNullException("appPaths");
}
if (jsonSerializer == null)
{
throw new ArgumentNullException("jsonSerializer");
}
_appPaths = appPaths;
_jsonSerializer = jsonSerializer;
_criticReviewsPath = Path.Combine(_appPaths.DataPath, "critic-reviews");
_logger = logManager.GetLogger(GetType().Name);
var chapterDbFile = Path.Combine(_appPaths.DataPath, "chapters.db");
var chapterConnection = SqliteExtensions.ConnectToDb(chapterDbFile).Result;
_chapterRepository = new SqliteChapterRepository(chapterConnection, logManager);
}
/// <summary>
/// Opens the connection to the database
/// </summary>
/// <returns>Task.</returns>
public async Task Initialize()
{
var dbFile = Path.Combine(_appPaths.DataPath, "library.db");
_connection = await SqliteExtensions.ConnectToDb(dbFile).ConfigureAwait(false);
string[] queries = {
"create table if not exists TypedBaseItems (guid GUID primary key, type TEXT, data BLOB)",
"create index if not exists idx_TypedBaseItems on TypedBaseItems(guid)",
"create table if not exists ChildrenIds (ParentId GUID, ItemId GUID, PRIMARY KEY (ParentId, ItemId))",
"create index if not exists idx_ChildrenIds on ChildrenIds(ParentId,ItemId)",
//pragmas
"pragma temp_store = memory"
};
_connection.RunQueries(queries, _logger);
PrepareStatements();
_chapterRepository.Initialize();
}
/// <summary>
/// The _write lock
/// </summary>
private readonly SemaphoreSlim _writeLock = new SemaphoreSlim(1, 1);
/// <summary>
/// Prepares the statements.
/// </summary>
private void PrepareStatements()
{
_saveItemCommand = _connection.CreateCommand();
_saveItemCommand.CommandText = "replace into TypedBaseItems (guid, type, data) values (@1, @2, @3)";
_saveItemCommand.Parameters.Add(_saveItemCommand, "@1");
_saveItemCommand.Parameters.Add(_saveItemCommand, "@2");
_saveItemCommand.Parameters.Add(_saveItemCommand, "@3");
_deleteChildrenCommand = _connection.CreateCommand();
_deleteChildrenCommand.CommandText = "delete from ChildrenIds where ParentId=@ParentId";
_deleteChildrenCommand.Parameters.Add(_deleteChildrenCommand, "@ParentId");
_saveChildrenCommand = _connection.CreateCommand();
_saveChildrenCommand.CommandText = "replace into ChildrenIds (ParentId, ItemId) values (@ParentId, @ItemId)";
_saveChildrenCommand.Parameters.Add(_saveChildrenCommand, "@ParentId");
_saveChildrenCommand.Parameters.Add(_saveChildrenCommand, "@ItemId");
}
/// <summary>
/// Save a standard item in the repo
/// </summary>
/// <param name="item">The item.</param>
/// <param name="cancellationToken">The cancellation token.</param>
/// <returns>Task.</returns>
/// <exception cref="System.ArgumentNullException">item</exception>
public Task SaveItem(BaseItem item, CancellationToken cancellationToken)
{
if (item == null)
{
throw new ArgumentNullException("item");
}
return SaveItems(new[] { item }, cancellationToken);
}
/// <summary>
/// Saves the items.
/// </summary>
/// <param name="items">The items.</param>
/// <param name="cancellationToken">The cancellation token.</param>
/// <returns>Task.</returns>
/// <exception cref="System.ArgumentNullException">
/// items
/// or
/// cancellationToken
/// </exception>
public async Task SaveItems(IEnumerable<BaseItem> items, CancellationToken cancellationToken)
{
if (items == null)
{
throw new ArgumentNullException("items");
}
if (cancellationToken == null)
{
throw new ArgumentNullException("cancellationToken");
}
cancellationToken.ThrowIfCancellationRequested();
await _writeLock.WaitAsync(cancellationToken).ConfigureAwait(false);
IDbTransaction transaction = null;
try
{
transaction = _connection.BeginTransaction();
foreach (var item in items)
{
cancellationToken.ThrowIfCancellationRequested();
_saveItemCommand.GetParameter(0).Value = item.Id;
_saveItemCommand.GetParameter(1).Value = item.GetType().FullName;
_saveItemCommand.GetParameter(2).Value = _jsonSerializer.SerializeToBytes(item);
_saveItemCommand.Transaction = transaction;
_saveItemCommand.ExecuteNonQuery();
}
transaction.Commit();
}
catch (OperationCanceledException)
{
if (transaction != null)
{
transaction.Rollback();
}
throw;
}
catch (Exception e)
{
_logger.ErrorException("Failed to save items:", e);
if (transaction != null)
{
transaction.Rollback();
}
throw;
}
finally
{
if (transaction != null)
{
transaction.Dispose();
}
_writeLock.Release();
}
}
/// <summary>
/// Internal retrieve from items or users table
/// </summary>
/// <param name="id">The id.</param>
/// <returns>BaseItem.</returns>
/// <exception cref="System.ArgumentNullException">id</exception>
/// <exception cref="System.ArgumentException"></exception>
public BaseItem RetrieveItem(Guid id)
{
if (id == Guid.Empty)
{
throw new ArgumentNullException("id");
}
using (var cmd = _connection.CreateCommand())
{
cmd.CommandText = "select type,data from TypedBaseItems where guid = @guid";
cmd.Parameters.Add(cmd, "@guid", DbType.Guid).Value = id;
using (var reader = cmd.ExecuteReader(CommandBehavior.SequentialAccess | CommandBehavior.SingleResult | CommandBehavior.SingleRow))
{
if (reader.Read())
{
var typeString = reader.GetString(0);
var type = _typeMapper.GetType(typeString);
if (type == null)
{
_logger.Debug("Unknown type {0}", typeString);
return null;
}
using (var stream = reader.GetMemoryStream(1))
{
return _jsonSerializer.DeserializeFromStream(stream, type) as BaseItem;
}
}
}
return null;
}
}
/// <summary>
/// Gets the critic reviews.
/// </summary>
/// <param name="itemId">The item id.</param>
/// <returns>Task{IEnumerable{ItemReview}}.</returns>
public IEnumerable<ItemReview> GetCriticReviews(Guid itemId)
{
try
{
var path = Path.Combine(_criticReviewsPath, itemId + ".json");
return _jsonSerializer.DeserializeFromFile<List<ItemReview>>(path);
}
catch (DirectoryNotFoundException)
{
return new List<ItemReview>();
}
catch (FileNotFoundException)
{
return new List<ItemReview>();
}
}
/// <summary>
/// Saves the critic reviews.
/// </summary>
/// <param name="itemId">The item id.</param>
/// <param name="criticReviews">The critic reviews.</param>
/// <returns>Task.</returns>
public Task SaveCriticReviews(Guid itemId, IEnumerable<ItemReview> criticReviews)
{
Directory.CreateDirectory(_criticReviewsPath);
var path = Path.Combine(_criticReviewsPath, itemId + ".json");
_jsonSerializer.SerializeToFile(criticReviews.ToList(), path);
return Task.FromResult(true);
}
/// <summary>
/// Gets chapters for an item
/// </summary>
/// <param name="id">The id.</param>
/// <returns>IEnumerable{ChapterInfo}.</returns>
/// <exception cref="System.ArgumentNullException">id</exception>
public IEnumerable<ChapterInfo> GetChapters(Guid id)
{
return _chapterRepository.GetChapters(id);
}
/// <summary>
/// Gets a single chapter for an item
/// </summary>
/// <param name="id">The id.</param>
/// <param name="index">The index.</param>
/// <returns>ChapterInfo.</returns>
/// <exception cref="System.ArgumentNullException">id</exception>
public ChapterInfo GetChapter(Guid id, int index)
{
return _chapterRepository.GetChapter(id, index);
}
/// <summary>
/// Saves the chapters.
/// </summary>
/// <param name="id">The id.</param>
/// <param name="chapters">The chapters.</param>
/// <param name="cancellationToken">The cancellation token.</param>
/// <returns>Task.</returns>
/// <exception cref="System.ArgumentNullException">
/// id
/// or
/// chapters
/// or
/// cancellationToken
/// </exception>
public Task SaveChapters(Guid id, IEnumerable<ChapterInfo> chapters, CancellationToken cancellationToken)
{
return _chapterRepository.SaveChapters(id, chapters, cancellationToken);
}
/// <summary>
/// Performs application-defined tasks associated with freeing, releasing, or resetting unmanaged resources.
/// </summary>
public void Dispose()
{
Dispose(true);
GC.SuppressFinalize(this);
}
private readonly object _disposeLock = new object();
/// <summary>
/// Releases unmanaged and - optionally - managed resources.
/// </summary>
/// <param name="dispose"><c>true</c> to release both managed and unmanaged resources; <c>false</c> to release only unmanaged resources.</param>
protected virtual void Dispose(bool dispose)
{
if (dispose)
{
try
{
lock (_disposeLock)
{
if (_connection != null)
{
if (_connection.IsOpen())
{
_connection.Close();
}
_connection.Dispose();
_connection = null;
}
}
}
catch (Exception ex)
{
_logger.ErrorException("Error disposing database", ex);
}
if (_chapterRepository != null)
{
_chapterRepository.Dispose();
_chapterRepository = null;
}
}
}
public IEnumerable<Guid> GetChildren(Guid parentId)
{
if (parentId == Guid.Empty)
{
throw new ArgumentNullException("parentId");
}
using (var cmd = _connection.CreateCommand())
{
cmd.CommandText = "select ItemId from ChildrenIds where ParentId = @ParentId";
cmd.Parameters.Add(cmd, "@ParentId", DbType.Guid).Value = parentId;
using (var reader = cmd.ExecuteReader(CommandBehavior.SequentialAccess | CommandBehavior.SingleResult))
{
while (reader.Read())
{
yield return reader.GetGuid(0);
}
}
}
}
public async Task SaveChildren(Guid parentId, IEnumerable<Guid> children, CancellationToken cancellationToken)
{
if (parentId == Guid.Empty)
{
throw new ArgumentNullException("parentId");
}
if (children == null)
{
throw new ArgumentNullException("children");
}
if (cancellationToken == null)
{
throw new ArgumentNullException("cancellationToken");
}
cancellationToken.ThrowIfCancellationRequested();
await _writeLock.WaitAsync(cancellationToken).ConfigureAwait(false);
IDbTransaction transaction = null;
try
{
transaction = _connection.BeginTransaction();
// First delete
_deleteChildrenCommand.GetParameter(0).Value = parentId;
_deleteChildrenCommand.Transaction = transaction;
_deleteChildrenCommand.ExecuteNonQuery();
foreach (var id in children)
{
cancellationToken.ThrowIfCancellationRequested();
_saveChildrenCommand.GetParameter(0).Value = parentId;
_saveChildrenCommand.GetParameter(1).Value = id;
_saveChildrenCommand.Transaction = transaction;
_saveChildrenCommand.ExecuteNonQuery();
}
transaction.Commit();
}
catch (OperationCanceledException)
{
if (transaction != null)
{
transaction.Rollback();
}
throw;
}
catch (Exception e)
{
_logger.ErrorException("Failed to save children:", e);
if (transaction != null)
{
transaction.Rollback();
}
throw;
}
finally
{
if (transaction != null)
{
transaction.Dispose();
}
_writeLock.Release();
}
}
}
}