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Imported Upstream version 5.16.0.100
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mcs/class/System/System.Net/WebReadStream.cs
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mcs/class/System/System.Net/WebReadStream.cs
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//
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// WebReadStream.cs
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//
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// Author:
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// Martin Baulig <mabaul@microsoft.com>
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//
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// Copyright (c) 2018 Xamarin Inc. (http://www.xamarin.com)
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//
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// Permission is hereby granted, free of charge, to any person obtaining a copy
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// of this software and associated documentation files (the "Software"), to deal
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// in the Software without restriction, including without limitation the rights
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// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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// copies of the Software, and to permit persons to whom the Software is
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// furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in
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// all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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// THE SOFTWARE.
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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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namespace System.Net
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{
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abstract class WebReadStream : Stream
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{
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public WebOperation Operation {
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get;
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}
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protected Stream InnerStream {
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get;
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}
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#if MONO_WEB_DEBUG
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internal string ME => $"WRS({GetType ().Name}:Op={operation.ID})";
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#else
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internal string ME => null;
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#endif
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public WebReadStream (WebOperation operation, Stream innerStream)
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{
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Operation = operation;
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InnerStream = innerStream;
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}
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public override long Length => throw new NotSupportedException ();
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public override long Position {
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get => throw new NotSupportedException ();
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set => throw new NotSupportedException ();
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}
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public override bool CanSeek => false;
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public override bool CanRead => true;
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public override bool CanWrite => false;
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public override void SetLength (long value)
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{
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throw new NotSupportedException ();
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}
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public override long Seek (long offset, SeekOrigin origin)
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{
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throw new NotSupportedException ();
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}
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public override void Write (byte[] buffer, int offset, int count)
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{
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throw new NotSupportedException ();
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}
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public override void Flush ()
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{
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throw new NotSupportedException ();
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}
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protected Exception GetException (Exception e)
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{
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e = HttpWebRequest.FlattenException (e);
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if (e is WebException)
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return e;
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if (Operation.Aborted || e is OperationCanceledException || e is ObjectDisposedException)
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return HttpWebRequest.CreateRequestAbortedException ();
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return e;
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}
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public override int Read (byte[] buffer, int offset, int size)
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{
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if (!CanRead)
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throw new NotSupportedException (SR.net_writeonlystream);
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Operation.ThrowIfClosedOrDisposed ();
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if (buffer == null)
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throw new ArgumentNullException (nameof (buffer));
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int length = buffer.Length;
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if (offset < 0 || length < offset)
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throw new ArgumentOutOfRangeException (nameof (offset));
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if (size < 0 || (length - offset) < size)
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throw new ArgumentOutOfRangeException (nameof (size));
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try {
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return ReadAsync (buffer, offset, size, CancellationToken.None).Result;
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} catch (Exception e) {
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throw GetException (e);
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}
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}
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public override IAsyncResult BeginRead (byte[] buffer, int offset, int size,
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AsyncCallback cb, object state)
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{
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if (!CanRead)
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throw new NotSupportedException (SR.net_writeonlystream);
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Operation.ThrowIfClosedOrDisposed ();
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if (buffer == null)
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throw new ArgumentNullException (nameof (buffer));
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int length = buffer.Length;
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if (offset < 0 || length < offset)
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throw new ArgumentOutOfRangeException (nameof (offset));
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if (size < 0 || (length - offset) < size)
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throw new ArgumentOutOfRangeException (nameof (size));
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var task = ReadAsync (buffer, offset, size, CancellationToken.None);
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return TaskToApm.Begin (task, cb, state);
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}
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public override int EndRead (IAsyncResult r)
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{
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if (r == null)
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throw new ArgumentNullException (nameof (r));
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try {
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return TaskToApm.End<int> (r);
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} catch (Exception e) {
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throw GetException (e);
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}
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}
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public sealed override async Task<int> ReadAsync (
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byte[] buffer, int offset, int size,
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CancellationToken cancellationToken)
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{
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Operation.ThrowIfDisposed (cancellationToken);
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if (buffer == null)
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throw new ArgumentNullException (nameof (buffer));
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int length = buffer.Length;
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if (offset < 0 || length < offset)
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throw new ArgumentOutOfRangeException (nameof (offset));
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if (size < 0 || (length - offset) < size)
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throw new ArgumentOutOfRangeException (nameof (size));
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WebConnection.Debug ($"{ME} READ");
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int nread;
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try {
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nread = await ProcessReadAsync (
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buffer, offset, size, cancellationToken).ConfigureAwait (false);
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WebConnection.Debug ($"{ME} READ DONE: nread={nread}");
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if (nread != 0)
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return nread;
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await FinishReading (cancellationToken).ConfigureAwait (false);
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return 0;
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} catch (OperationCanceledException) {
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WebConnection.Debug ($"{ME} READ CANCELED");
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throw;
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} catch (Exception ex) {
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WebConnection.Debug ($"{ME} READ ERROR: {ex.GetType ().Name}");
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throw;
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} finally {
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WebConnection.Debug ($"{ME} READ FINISHED");
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}
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}
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protected abstract Task<int> ProcessReadAsync (
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byte[] buffer, int offset, int size,
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CancellationToken cancellationToken);
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internal virtual Task FinishReading (CancellationToken cancellationToken)
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{
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Operation.ThrowIfDisposed (cancellationToken);
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WebConnection.Debug ($"{ME} FINISH READING: InnerStream={InnerStream?.GetType ()?.Name}!");
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if (InnerStream is WebReadStream innerReadStream)
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return innerReadStream.FinishReading (cancellationToken);
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return Task.CompletedTask;
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}
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bool disposed;
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protected override void Dispose (bool disposing)
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{
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if (disposing && !disposed) {
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disposed = true;
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if (InnerStream != null)
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InnerStream.Dispose ();
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}
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base.Dispose (disposing);
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}
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}
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}
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