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jellyfin/MediaBrowser.Server.Sqlite/SQLiteItemRepository.cs

279 lines
9.7 KiB

using MediaBrowser.Common.Serialization;
using MediaBrowser.Controller;
using MediaBrowser.Controller.Entities;
using MediaBrowser.Controller.Persistence;
using MediaBrowser.Model.Logging;
using System;
using System.Collections.Generic;
using System.Data;
using System.IO;
using System.Threading;
using System.Threading.Tasks;
namespace MediaBrowser.Server.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;
}
}
/// <summary>
/// Initializes a new instance of the <see cref="SQLiteUserDataRepository" /> class.
/// </summary>
/// <param name="logger">The logger.</param>
public SQLiteItemRepository(ILogger logger)
: base(logger)
{
}
/// <summary>
/// Opens the connection to the database
/// </summary>
/// <returns>Task.</returns>
public async Task Initialize()
{
var dbFile = Path.Combine(Kernel.Instance.ApplicationPaths.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);
}
//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>
/// 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");
}
if (cancellationToken == null)
{
throw new ArgumentNullException("cancellationToken");
}
cancellationToken.ThrowIfCancellationRequested();
return Task.Run(() =>
{
var serialized = JsonSerializer.SerializeToBytes(item);
cancellationToken.ThrowIfCancellationRequested();
var cmd = connection.CreateCommand();
cmd.CommandText = "replace into items (guid, obj_type, data) values (@1, @2, @3)";
cmd.AddParam("@1", item.Id);
cmd.AddParam("@2", item.GetType().FullName);
cmd.AddParam("@3", serialized);
QueueCommand(cmd);
});
}
/// <summary>
/// Retrieve a standard item from the repo
/// </summary>
/// <param name="id">The id.</param>
/// <returns>BaseItem.</returns>
/// <exception cref="System.ArgumentException"></exception>
public BaseItem RetrieveItem(Guid id)
{
if (id == Guid.Empty)
{
throw new ArgumentException();
}
return RetrieveItemInternal(id);
}
/// <summary>
/// Internal retrieve from items or users table
/// </summary>
/// <param name="id">The id.</param>
/// <returns>BaseItem.</returns>
/// <exception cref="System.ArgumentException"></exception>
protected BaseItem RetrieveItemInternal(Guid id)
{
if (id == Guid.Empty)
{
throw new ArgumentException();
}
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();
}
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 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();
return Task.Run(() =>
{
var cmd = connection.CreateCommand();
cmd.CommandText = "delete from children where guid = @guid";
cmd.AddParam("@guid", id);
QueueCommand(cmd);
foreach (var child in children)
{
var guid = child.Id;
cmd = connection.CreateCommand();
cmd.AddParam("@guid", id);
cmd.CommandText = "replace into children (guid, child) values (@guid, @child)";
var childParam = cmd.Parameters.Add("@child", DbType.Guid);
childParam.Value = guid;
QueueCommand(cmd);
}
});
}
}
}