90 lines
3.5 KiB
C#
90 lines
3.5 KiB
C#
// (c) Copyright Ascensio System SIA 2010-2022
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//
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// This program is a free software product.
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// You can redistribute it and/or modify it under the terms
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// of the GNU Affero General Public License (AGPL) version 3 as published by the Free Software
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// Foundation. In accordance with Section 7(a) of the GNU AGPL its Section 15 shall be amended
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// to the effect that Ascensio System SIA expressly excludes the warranty of non-infringement of
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// any third-party rights.
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//
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// This program is distributed WITHOUT ANY WARRANTY, without even the implied warranty
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// of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. For details, see
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// the GNU AGPL at: http://www.gnu.org/licenses/agpl-3.0.html
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//
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// You can contact Ascensio System SIA at Lubanas st. 125a-25, Riga, Latvia, EU, LV-1021.
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//
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// The interactive user interfaces in modified source and object code versions of the Program must
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// display Appropriate Legal Notices, as required under Section 5 of the GNU AGPL version 3.
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//
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// Pursuant to Section 7(b) of the License you must retain the original Product logo when
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// distributing the program. Pursuant to Section 7(e) we decline to grant you any rights under
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// trademark law for use of our trademarks.
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//
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// All the Product's GUI elements, including illustrations and icon sets, as well as technical writing
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// content are licensed under the terms of the Creative Commons Attribution-ShareAlike 4.0
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// International. See the License terms at http://creativecommons.org/licenses/by-sa/4.0/legalcode
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namespace ASC.Data.Storage;
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public static class Extensions
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{
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private const int BufferSize = 2048;//NOTE: set to 2048 to fit in minimum tcp window
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public static async Task<Stream> IronReadStreamAsync(this IDataStore store, TempStream tempStream, string domain, string path, int tryCount)
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{
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var ms = tempStream.Create();
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await IronReadToStreamAsync(store, domain, path, tryCount, ms);
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ms.Seek(0, SeekOrigin.Begin);
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return ms;
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}
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public static Task IronReadToStreamAsync(this IDataStore store, string domain, string path, int tryCount, Stream readTo)
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{
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if (tryCount < 1)
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{
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throw new ArgumentOutOfRangeException(nameof(tryCount), "Must be greater or equal 1.");
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}
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if (!readTo.CanWrite)
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{
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throw new ArgumentException("stream cannot be written", nameof(readTo));
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}
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return InternalIronReadToStreamAsync(store, domain, path, tryCount, readTo);
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}
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private static async Task InternalIronReadToStreamAsync(this IDataStore store, string domain, string path, int tryCount, Stream readTo)
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{
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var tryCurrent = 0;
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var offset = 0;
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while (tryCurrent < tryCount)
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{
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try
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{
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tryCurrent++;
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using var stream = await store.GetReadStreamAsync(domain, path, offset);
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var buffer = new byte[BufferSize];
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int readed;
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while ((readed = await stream.ReadAsync(buffer, 0, BufferSize)) > 0)
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{
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await readTo.WriteAsync(buffer, 0, readed);
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offset += readed;
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}
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break;
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}
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catch (Exception ex)
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{
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if (tryCurrent >= tryCount)
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{
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throw new IOException("Can not read stream. Tries count: " + tryCurrent + ".", ex);
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}
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Thread.Sleep(tryCount * 50);
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}
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}
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}
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}
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