87 lines
3.7 KiB
C#
87 lines
3.7 KiB
C#
/*
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*
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* (c) Copyright Ascensio System Limited 2010-2018
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*
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* This program is freeware. You can redistribute it and/or modify it under the terms of the GNU
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* General Public License (GPL) version 3 as published by the Free Software Foundation (https://www.gnu.org/copyleft/gpl.html).
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* In accordance with Section 7(a) of the GNU GPL its Section 15 shall be amended to the effect that
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* Ascensio System SIA expressly excludes the warranty of non-infringement of any third-party rights.
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*
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* THIS PROGRAM IS DISTRIBUTED WITHOUT ANY WARRANTY; WITHOUT EVEN THE IMPLIED WARRANTY OF MERCHANTABILITY OR
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* FITNESS FOR A PARTICULAR PURPOSE. For more details, see GNU GPL at https://www.gnu.org/copyleft/gpl.html
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*
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* You can contact Ascensio System SIA by email at sales@onlyoffice.com
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*
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* The interactive user interfaces in modified source and object code versions of ONLYOFFICE must display
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* Appropriate Legal Notices, as required under Section 5 of the GNU GPL version 3.
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*
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* Pursuant to Section 7 § 3(b) of the GNU GPL you must retain the original ONLYOFFICE logo which contains
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* relevant author attributions when distributing the software. If the display of the logo in its graphic
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* form is not reasonably feasible for technical reasons, you must include the words "Powered by ONLYOFFICE"
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* in every copy of the program you distribute.
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* Pursuant to Section 7 § 3(e) we decline to grant you any rights under trademark law for use of our trademarks.
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*
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*/
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using System;
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using System.IO;
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using System.Threading;
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using System.Threading.Tasks;
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using ASC.Common;
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namespace ASC.Data.Storage
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{
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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) throw new ArgumentOutOfRangeException(nameof(tryCount), "Must be greater or equal 1.");
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if (!readTo.CanWrite) throw new ArgumentException("stream cannot be written", nameof(readTo));
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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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} |