jellyfin/MediaBrowser.Server.Implementations/Persistence/SqliteProviderInfoRepository.cs

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C#
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using MediaBrowser.Controller.Providers;
using MediaBrowser.Model.Logging;
using System;
using System.Collections.Generic;
using System.Data;
using System.Linq;
using System.Threading;
using System.Threading.Tasks;
namespace MediaBrowser.Server.Implementations.Persistence
{
class SqliteProviderInfoRepository
{
private IDbConnection _connection;
private readonly ILogger _logger;
private IDbCommand _deleteInfosCommand;
private IDbCommand _saveInfoCommand;
public SqliteProviderInfoRepository(IDbConnection connection, ILogManager logManager)
{
_connection = connection;
_logger = logManager.GetLogger(GetType().Name);
}
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private SqliteShrinkMemoryTimer _shrinkMemoryTimer;
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/// <summary>
/// Opens the connection to the database
/// </summary>
/// <returns>Task.</returns>
public void Initialize()
{
var createTableCommand
= "create table if not exists providerinfos ";
createTableCommand += "(ItemId GUID, ProviderId GUID, ProviderVersion TEXT, FileStamp GUID, LastRefreshStatus TEXT, LastRefreshed datetime, PRIMARY KEY (ItemId, ProviderId))";
string[] queries = {
createTableCommand,
"create index if not exists idx_providerinfos on providerinfos(ItemId, ProviderId)",
//pragmas
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"pragma temp_store = memory",
"pragma shrink_memory"
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};
_connection.RunQueries(queries, _logger);
PrepareStatements();
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_shrinkMemoryTimer = new SqliteShrinkMemoryTimer(_connection, _writeLock, _logger);
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}
private static readonly string[] SaveColumns =
{
"ItemId",
"ProviderId",
"ProviderVersion",
"FileStamp",
"LastRefreshStatus",
"LastRefreshed"
};
private readonly string[] _selectColumns = SaveColumns.Skip(1).ToArray();
/// <summary>
/// The _write lock
/// </summary>
private readonly SemaphoreSlim _writeLock = new SemaphoreSlim(1, 1);
/// <summary>
/// Prepares the statements.
/// </summary>
private void PrepareStatements()
{
_deleteInfosCommand = _connection.CreateCommand();
_deleteInfosCommand.CommandText = "delete from providerinfos where ItemId=@ItemId";
_deleteInfosCommand.Parameters.Add(_deleteInfosCommand, "@ItemId");
_saveInfoCommand = _connection.CreateCommand();
_saveInfoCommand.CommandText = string.Format("replace into providerinfos ({0}) values ({1})",
string.Join(",", SaveColumns),
string.Join(",", SaveColumns.Select(i => "@" + i).ToArray()));
foreach (var col in SaveColumns)
{
_saveInfoCommand.Parameters.Add(_saveInfoCommand, "@" + col);
}
}
public IEnumerable<BaseProviderInfo> GetBaseProviderInfos(Guid itemId)
{
if (itemId == Guid.Empty)
{
throw new ArgumentNullException("itemId");
}
using (var cmd = _connection.CreateCommand())
{
var cmdText = "select " + string.Join(",", _selectColumns) + " from providerinfos where";
cmdText += " ItemId=@ItemId";
cmd.Parameters.Add(cmd, "@ItemId", DbType.Guid).Value = itemId;
cmd.CommandText = cmdText;
using (var reader = cmd.ExecuteReader(CommandBehavior.SequentialAccess | CommandBehavior.SingleResult))
{
while (reader.Read())
{
yield return GetBaseProviderInfo(reader);
}
}
}
}
/// <summary>
/// Gets the chapter.
/// </summary>
/// <param name="reader">The reader.</param>
/// <returns>ChapterInfo.</returns>
private BaseProviderInfo GetBaseProviderInfo(IDataReader reader)
{
var item = new BaseProviderInfo
{
ProviderId = reader.GetGuid(0)
};
if (!reader.IsDBNull(1))
{
item.ProviderVersion = reader.GetString(1);
}
item.FileStamp = reader.GetGuid(2);
item.LastRefreshStatus = (ProviderRefreshStatus)Enum.Parse(typeof(ProviderRefreshStatus), reader.GetString(3), true);
item.LastRefreshed = reader.GetDateTime(4).ToUniversalTime();
return item;
}
public async Task SaveProviderInfos(Guid id, IEnumerable<BaseProviderInfo> infos, CancellationToken cancellationToken)
{
if (id == Guid.Empty)
{
throw new ArgumentNullException("id");
}
if (infos == null)
{
throw new ArgumentNullException("infos");
}
cancellationToken.ThrowIfCancellationRequested();
await _writeLock.WaitAsync(cancellationToken).ConfigureAwait(false);
IDbTransaction transaction = null;
try
{
transaction = _connection.BeginTransaction();
// First delete chapters
_deleteInfosCommand.GetParameter(0).Value = id;
_deleteInfosCommand.Transaction = transaction;
_deleteInfosCommand.ExecuteNonQuery();
foreach (var stream in infos)
{
cancellationToken.ThrowIfCancellationRequested();
_saveInfoCommand.GetParameter(0).Value = id;
_saveInfoCommand.GetParameter(1).Value = stream.ProviderId;
_saveInfoCommand.GetParameter(2).Value = stream.ProviderVersion;
_saveInfoCommand.GetParameter(3).Value = stream.FileStamp;
_saveInfoCommand.GetParameter(4).Value = stream.LastRefreshStatus.ToString();
_saveInfoCommand.GetParameter(5).Value = stream.LastRefreshed;
_saveInfoCommand.Transaction = transaction;
_saveInfoCommand.ExecuteNonQuery();
}
transaction.Commit();
}
catch (OperationCanceledException)
{
if (transaction != null)
{
transaction.Rollback();
}
throw;
}
catch (Exception e)
{
_logger.ErrorException("Failed to save provider info:", e);
if (transaction != null)
{
transaction.Rollback();
}
throw;
}
finally
{
if (transaction != null)
{
transaction.Dispose();
}
_writeLock.Release();
}
}
/// <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)
{
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if (_shrinkMemoryTimer != null)
{
_shrinkMemoryTimer.Dispose();
_shrinkMemoryTimer = null;
}
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if (_connection != null)
{
if (_connection.IsOpen())
{
_connection.Close();
}
_connection.Dispose();
_connection = null;
}
}
}
catch (Exception ex)
{
_logger.ErrorException("Error disposing database", ex);
}
}
}
}
}