private bool SeekBlob(BlobsTable table, BlobId id, bool includeUncompleted)
{
if (!table.Indexes.PrimaryIndex.Find(table.Indexes.PrimaryIndex.CreateKey(id.Id)))
{
return(false);
}
if (!includeUncompleted)
{
return(table.Columns.IsCompleted);
}
return(true);
}
/// <summary>
/// Для юнит тестов. Проверка на наличие Файла.
/// </summary>
/// <param name="id">Идентификатор.</param>
/// <returns>Результат.</returns>
public async Task <bool> IsFilePresent(BlobId id)
{
try
{
var f = await _filestreamFolder.GetFileAsync(BlobFileName(id.Id));
var s = await f.GetBasicPropertiesAsync();
return(s.Size > 0);
}
catch
{
return(false);
}
}
/// <summary>
/// Получить размер файла.
/// </summary>
/// <param name="id">Идентификатор.</param>
/// <returns>Информация о файле.</returns>
public async Task <BlobInfo?> GetBlobInfo(BlobId id)
{
CheckModuleReady();
await WaitForTablesInitialize();
return(await OpenSessionAsync(async session =>
{
BlobInfo?result = null;
await session.Run(() =>
{
using (var table = OpenBlobsTable(session, OpenTableGrbit.ReadOnly))
{
result = LoadBlobInfo(table, id);
}
});
return await AddFileSize(result);
}));
}
private BlobInfo?LoadBlobInfo(BlobsTable table, BlobId id)
{
BlobInfo?result = null;
if (SeekBlob(table, id, false))
{
var data = table.Views.FullRowUpdate.Fetch();
result = new BlobInfo()
{
Id = id,
UniqueName = data.Name,
Category = data.Category,
CreatedTime = data.CreatedDate,
Size = data.Length,
ReferenceId = data.ReferenceId,
IsUncompleted = !data.IsCompleted,
IsFilestream = data.IsFilestream
};
}
return(result);
}
/// <summary>
/// Конструктор. Должен вызываться из потока сессии.
/// </summary>
/// <param name="globalErrorHandler">Обработчик глобальных ошибок.</param>
/// <param name="session">Сессия.</param>
/// <param name="blobId">Идентификатор блоба.</param>
public BlocksBlobStream(IGlobalErrorHandler globalErrorHandler, IEsentSession session, BlobId blobId) : base(globalErrorHandler)
{
_session = session ?? throw new ArgumentNullException(nameof(session));
var sid = _session.Session;
try
{
_usage = _session.UseSession();
_transaction = new Transaction(session.Session);
try
{
var tbl = session.OpenTable(BlobTableInfo.BlobsTableName, OpenTableGrbit.ReadOnly);
_table = new BlobsTable(tbl.Session, tbl);
try
{
Api.MakeKey(sid, _table, blobId.Id, MakeKeyGrbit.NewKey);
if (!Api.TrySeek(sid, _table, SeekGrbit.SeekEQ))
{
throw new BlobNotFoundException(blobId);
}
_inlinedStream = new ColumnStream(sid, _table, _table.GetColumnid(BlobsTable.Column.Data));
Length = _inlinedStream.Length;
}
catch
{
_table.Dispose();
}
}
catch
{
_transaction.Dispose();
throw;
}
}
catch
{
_usage.Dispose();
throw;
}
}
/// <summary>
/// Удалить файл.
/// </summary>
/// <param name="id">Идентификатор.</param>
/// <returns>true, если файл найден и удалён. false, если нет такого файла или файл заблокирован на удаление.</returns>
public async Task <bool> DeleteBlob(BlobId id)
{
CheckModuleReady();
await WaitForTablesInitialize();
return(await OpenSessionAsync(async session =>
{
bool isFileStream = false;
byte[] bookmark = null;
bool result = false;
await session.RunInTransaction(() =>
{
using (var table = OpenBlobsTable(session, OpenTableGrbit.None))
{
if (table.Indexes.PrimaryIndex.Find(table.Indexes.PrimaryIndex.CreateKey(id.Id)))
{
isFileStream = table.Columns.IsFilestream;
if (!isFileStream)
{
table.DeleteCurrentRow();
result = true;
}
else
{
bookmark = table.GetBookmark();
}
}
return true;
}
}, 1.5);
if (isFileStream)
{
bool isDeleted;
try
{
await(await _filestreamFolder.GetFileAsync(BlobFileName(id.Id))).DeleteAsync();
isDeleted = true;
}
catch
{
isDeleted = false;
}
if (isDeleted)
{
await session.RunInTransaction(() =>
{
using (var table = OpenBlobsTable(session, OpenTableGrbit.None))
{
if (table.TryGotoBookmark(bookmark))
{
table.DeleteCurrentRow();
result = true;
}
}
return true;
}, 1.5);
}
}
return result;
}));
}
/// <summary>
/// Загрузить файл.
/// </summary>
/// <param name="id">Идентификатор.</param>
/// <returns>Результат.</returns>
public async Task <Stream> LoadBlob(BlobId id)
{
CheckModuleReady();
await WaitForTablesInitialize();
return(await OpenSessionAsync(async session =>
{
BlobStreamBase result = null;
BlobId?filestream = null;
void DoLoad()
{
using (var table = OpenBlobsTable(session, OpenTableGrbit.ReadOnly))
{
if (table.Indexes.PrimaryIndex.Find(table.Indexes.PrimaryIndex.CreateKey(id.Id)))
{
var isFilestream = table.Columns.IsFilestream;
if (isFilestream)
{
filestream = id;
return;
}
else
{
var size = Api.RetrieveColumnSize(table.Session, table, table.GetColumnid(BlobsTable.Column.Data)) ?? 0;
if (size <= MaxInlineSize)
{
var data = table.Columns.Data;
if (data == null)
{
throw new BlobException($"Неверные данные в таблице {BlobsTableName}");
}
result = new InlineBlobStream(GlobalErrorHandler, data);
}
else
{
result = new BlocksBlobStream(GlobalErrorHandler, session, id);
}
}
}
else
{
throw new BlobNotFoundException(id);
}
}
}
await session.Run(DoLoad);
if (filestream != null)
{
return new InlineFileStream(GlobalErrorHandler, await _filestreamFolder.OpenStreamForReadAsync(BlobFileName(id.Id)));
}
if (result == null)
{
throw new BlobException($"Неверные данные в таблице {BlobsTableName}");
}
return result;
}));
}
