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jellyfin/MediaBrowser.Server.Impleme.../Sqlite/SQLiteItemRepository.cs

523 lines
18 KiB

using MediaBrowser.Common.Configuration;
using MediaBrowser.Controller.Entities;
using MediaBrowser.Controller.Persistence;
using MediaBrowser.Model.Entities;
using MediaBrowser.Model.Logging;
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using MediaBrowser.Model.Serialization;
using MediaBrowser.Server.Implementations.Reflection;
using System;
using System.Collections.Generic;
using System.Data;
using System.Data.SQLite;
using System.IO;
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using System.Linq;
using System.Threading;
using System.Threading.Tasks;
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namespace MediaBrowser.Server.Implementations.Sqlite
{
/// <summary>
/// Class SQLiteItemRepository
/// </summary>
public class SQLiteItemRepository : SqliteRepository, IItemRepository
{
/// <summary>
/// The _type mapper
/// </summary>
private readonly TypeMapper _typeMapper = new TypeMapper();
/// <summary>
/// The repository name
/// </summary>
public const string RepositoryName = "SQLite";
/// <summary>
/// Gets the name of the repository
/// </summary>
/// <value>The name.</value>
public string Name
{
get
{
return RepositoryName;
}
}
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/// <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 SQLiteCommand _saveItemCommand;
/// <summary>
/// The _delete children command
/// </summary>
private SQLiteCommand _deleteChildrenCommand;
/// <summary>
/// The _save children command
/// </summary>
private SQLiteCommand _saveChildrenCommand;
/// <summary>
/// Initializes a new instance of the <see cref="SQLiteUserDataRepository" /> class.
/// </summary>
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/// <param name="appPaths">The app paths.</param>
/// <param name="jsonSerializer">The json serializer.</param>
/// <param name="logManager">The log manager.</param>
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/// <exception cref="System.ArgumentNullException">appPaths</exception>
public SQLiteItemRepository(IApplicationPaths appPaths, IJsonSerializer jsonSerializer, ILogManager logManager)
: base(logManager)
{
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if (appPaths == null)
{
throw new ArgumentNullException("appPaths");
}
if (jsonSerializer == null)
{
throw new ArgumentNullException("jsonSerializer");
}
_appPaths = appPaths;
_jsonSerializer = jsonSerializer;
}
/// <summary>
/// Opens the connection to the database
/// </summary>
/// <returns>Task.</returns>
public async Task Initialize()
{
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var dbFile = Path.Combine(_appPaths.DataPath, "library.db");
await ConnectToDb(dbFile).ConfigureAwait(false);
string[] queries = {
"create table if not exists items (guid GUID primary key, obj_type, data BLOB)",
"create index if not exists idx_items on items(guid)",
"create table if not exists children (guid GUID, child GUID)",
"create unique index if not exists idx_children on children(guid, child)",
"create table if not exists schema_version (table_name primary key, version)",
//triggers
TriggerSql,
//pragmas
"pragma temp_store = memory"
};
RunQueries(queries);
PrepareStatements();
}
//cascade delete triggers
/// <summary>
/// The trigger SQL
/// </summary>
protected string TriggerSql =
@"CREATE TRIGGER if not exists delete_item
AFTER DELETE
ON items
FOR EACH ROW
BEGIN
DELETE FROM children WHERE children.guid = old.child;
DELETE FROM children WHERE children.child = old.child;
END";
/// <summary>
/// The _write lock
/// </summary>
private readonly SemaphoreSlim _writeLock = new SemaphoreSlim(1, 1);
/// <summary>
/// Prepares the statements.
/// </summary>
private void PrepareStatements()
{
_saveItemCommand = new SQLiteCommand
{
CommandText = "replace into items (guid, obj_type, data) values (@1, @2, @3)"
};
_saveItemCommand.Parameters.Add(new SQLiteParameter("@1"));
_saveItemCommand.Parameters.Add(new SQLiteParameter("@2"));
_saveItemCommand.Parameters.Add(new SQLiteParameter("@3"));
_deleteChildrenCommand = new SQLiteCommand
{
CommandText = "delete from children where guid = @guid"
};
_deleteChildrenCommand.Parameters.Add(new SQLiteParameter("@guid"));
_saveChildrenCommand = new SQLiteCommand
{
CommandText = "replace into children (guid, child) values (@guid, @child)"
};
_saveChildrenCommand.Parameters.Add(new SQLiteParameter("@guid"));
_saveChildrenCommand.Parameters.Add(new SQLiteParameter("@child"));
}
/// <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);
SQLiteTransaction transaction = null;
try
{
transaction = Connection.BeginTransaction();
foreach (var item in items)
{
cancellationToken.ThrowIfCancellationRequested();
_saveItemCommand.Parameters[0].Value = item.Id;
_saveItemCommand.Parameters[1].Value = item.GetType().FullName;
_saveItemCommand.Parameters[2].Value = _jsonSerializer.SerializeToBytes(item);
_saveItemCommand.Transaction = transaction;
await _saveItemCommand.ExecuteNonQueryAsync(cancellationToken);
}
transaction.Commit();
}
catch (OperationCanceledException)
{
if (transaction != null)
{
transaction.Rollback();
}
}
catch (Exception e)
{
Logger.ErrorException("Failed to save item:", e);
if (transaction != null)
{
transaction.Rollback();
}
}
finally
{
if (transaction != null)
{
transaction.Dispose();
}
_writeLock.Release();
}
}
/// <summary>
/// Retrieve a standard item from the repo
/// </summary>
/// <param name="id">The id.</param>
/// <returns>BaseItem.</returns>
/// <exception cref="System.ArgumentNullException">id</exception>
/// <exception cref="System.ArgumentException"></exception>
public BaseItem GetItem(Guid id)
{
if (id == Guid.Empty)
{
throw new ArgumentNullException("id");
}
return RetrieveItemInternal(id);
}
/// <summary>
/// Retrieves the items.
/// </summary>
/// <param name="ids">The ids.</param>
/// <returns>IEnumerable{BaseItem}.</returns>
/// <exception cref="System.ArgumentNullException">ids</exception>
public IEnumerable<BaseItem> GetItems(IEnumerable<Guid> ids)
{
if (ids == null)
{
throw new ArgumentNullException("ids");
}
return ids.Select(RetrieveItemInternal);
}
/// <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>
protected BaseItem RetrieveItemInternal(Guid id)
{
if (id == Guid.Empty)
{
throw new ArgumentNullException("id");
}
using (var cmd = Connection.CreateCommand())
{
cmd.CommandText = "select obj_type,data from items where guid = @guid";
var guidParam = cmd.Parameters.Add("@guid", DbType.Guid);
guidParam.Value = id;
using (var reader = cmd.ExecuteReader(CommandBehavior.SequentialAccess | CommandBehavior.SingleResult | CommandBehavior.SingleRow))
{
if (reader.Read())
{
var type = reader.GetString(0);
using (var stream = GetStream(reader, 1))
{
var itemType = _typeMapper.GetType(type);
if (itemType == null)
{
Logger.Error("Cannot find type {0}. Probably belongs to plug-in that is no longer loaded.", type);
return null;
}
var item = _jsonSerializer.DeserializeFromStream(stream, itemType);
return item as BaseItem;
}
}
}
return null;
}
}
/// <summary>
/// Retrieve all the children of the given folder
/// </summary>
/// <param name="parent">The parent.</param>
/// <returns>IEnumerable{BaseItem}.</returns>
/// <exception cref="System.ArgumentNullException"></exception>
public IEnumerable<BaseItem> RetrieveChildren(Folder parent)
{
if (parent == null)
{
throw new ArgumentNullException();
}
using (var cmd = Connection.CreateCommand())
{
cmd.CommandText = "select obj_type,data from items where guid in (select child from children where guid = @guid)";
var guidParam = cmd.Parameters.Add("@guid", DbType.Guid);
guidParam.Value = parent.Id;
using (var reader = cmd.ExecuteReader(CommandBehavior.SequentialAccess | CommandBehavior.SingleResult))
{
while (reader.Read())
{
var type = reader.GetString(0);
using (var stream = GetStream(reader, 1))
{
var itemType = _typeMapper.GetType(type);
if (itemType == null)
{
Logger.Error("Cannot find type {0}. Probably belongs to plug-in that is no longer loaded.", type);
continue;
}
var item = _jsonSerializer.DeserializeFromStream(stream, itemType) as BaseItem;
if (item != null)
{
item.Parent = parent;
yield return item;
}
}
}
}
}
}
/// <summary>
/// Save references to all the children for the given folder
/// (Doesn't actually save the child entities)
/// </summary>
/// <param name="id">The id.</param>
/// <param name="children">The children.</param>
/// <param name="cancellationToken">The cancellation token.</param>
/// <returns>Task.</returns>
/// <exception cref="System.ArgumentNullException">id</exception>
public async Task SaveChildren(Guid id, IEnumerable<BaseItem> children, CancellationToken cancellationToken)
{
if (id == Guid.Empty)
{
throw new ArgumentNullException("id");
}
if (children == null)
{
throw new ArgumentNullException("children");
}
if (cancellationToken == null)
{
throw new ArgumentNullException("cancellationToken");
}
cancellationToken.ThrowIfCancellationRequested();
await _writeLock.WaitAsync(cancellationToken).ConfigureAwait(false);
SQLiteTransaction transaction = null;
try
{
transaction = Connection.BeginTransaction();
// Delete exising children
_deleteChildrenCommand.Parameters[0].Value = id;
_deleteChildrenCommand.Transaction = transaction;
await _deleteChildrenCommand.ExecuteNonQueryAsync(cancellationToken);
// Save new children
foreach (var child in children)
{
_saveChildrenCommand.Transaction = transaction;
_saveChildrenCommand.Parameters[0].Value = id;
_saveChildrenCommand.Parameters[1].Value = child.Id;
await _saveChildrenCommand.ExecuteNonQueryAsync(cancellationToken);
}
transaction.Commit();
}
catch (OperationCanceledException)
{
if (transaction != null)
{
transaction.Rollback();
}
}
catch (Exception e)
{
Logger.ErrorException("Failed to save item:", e);
if (transaction != null)
{
transaction.Rollback();
}
}
finally
{
if (transaction != null)
{
transaction.Dispose();
}
_writeLock.Release();
}
}
/// <summary>
/// Gets the critic reviews path.
/// </summary>
/// <value>The critic reviews path.</value>
private string CriticReviewsPath
{
get
{
var path = Path.Combine(_appPaths.DataPath, "critic-reviews");
if (!Directory.Exists(path))
{
Directory.CreateDirectory(path);
}
return path;
}
}
/// <summary>
/// Gets the critic reviews.
/// </summary>
/// <param name="itemId">The item id.</param>
/// <returns>Task{IEnumerable{ItemReview}}.</returns>
public Task<IEnumerable<ItemReview>> GetCriticReviews(Guid itemId)
{
return Task.Run<IEnumerable<ItemReview>>(() =>
{
try
{
var path = Path.Combine(CriticReviewsPath, itemId + ".json");
return _jsonSerializer.DeserializeFromFile<List<ItemReview>>(path);
}
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)
{
return Task.Run(() =>
{
var path = Path.Combine(CriticReviewsPath, itemId + ".json");
_jsonSerializer.SerializeToFile(criticReviews.ToList(), path);
});
}
}
}