1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
|
// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
using System.IO;
using System.Threading;
using System.Threading.Tasks;
namespace System.Net.Http
{
internal partial class HttpConnection : IDisposable
{
private sealed class RawConnectionStream : HttpContentDuplexStream
{
public RawConnectionStream(HttpConnection connection) : base(connection)
{
}
public override async ValueTask<int> ReadAsync(Memory<byte> buffer, CancellationToken cancellationToken)
{
CancellationHelper.ThrowIfCancellationRequested(cancellationToken);
if (_connection == null || buffer.Length == 0)
{
// Response body fully consumed or the caller didn't ask for any data
return 0;
}
ValueTask<int> readTask = _connection.ReadBufferedAsync(buffer);
int bytesRead;
if (readTask.IsCompletedSuccessfully)
{
bytesRead = readTask.Result;
}
else
{
CancellationTokenRegistration ctr = _connection.RegisterCancellation(cancellationToken);
try
{
bytesRead = await readTask.ConfigureAwait(false);
}
#if MONOTOUCH_WATCH
catch (Exception exc)
{
if (CancellationHelper.ShouldWrapInOperationCanceledException(exc, cancellationToken))
{
throw CancellationHelper.CreateOperationCanceledException(exc, cancellationToken);
}
throw;
}
#else
catch (Exception exc) when (CancellationHelper.ShouldWrapInOperationCanceledException(exc, cancellationToken))
{
throw CancellationHelper.CreateOperationCanceledException(exc, cancellationToken);
}
#endif
finally
{
ctr.Dispose();
}
}
if (bytesRead == 0)
{
// A cancellation request may have caused the EOF.
CancellationHelper.ThrowIfCancellationRequested(cancellationToken);
// We cannot reuse this connection, so close it.
_connection.Dispose();
_connection = null;
return 0;
}
return bytesRead;
}
public override Task CopyToAsync(Stream destination, int bufferSize, CancellationToken cancellationToken)
{
ValidateCopyToArgs(this, destination, bufferSize);
if (cancellationToken.IsCancellationRequested)
{
return Task.FromCanceled(cancellationToken);
}
if (_connection == null)
{
// null if response body fully consumed
return Task.CompletedTask;
}
Task copyTask = _connection.CopyToUntilEofAsync(destination, bufferSize, cancellationToken);
if (copyTask.IsCompletedSuccessfully)
{
Finish();
return Task.CompletedTask;
}
return CompleteCopyToAsync(copyTask, cancellationToken);
}
private async Task CompleteCopyToAsync(Task copyTask, CancellationToken cancellationToken)
{
CancellationTokenRegistration ctr = _connection.RegisterCancellation(cancellationToken);
try
{
await copyTask.ConfigureAwait(false);
}
#if MONOTOUCH_WATCH
catch (Exception exc)
{
if (CancellationHelper.ShouldWrapInOperationCanceledException(exc, cancellationToken))
{
throw CancellationHelper.CreateOperationCanceledException(exc, cancellationToken);
}
throw;
}
#else
catch (Exception exc) when (CancellationHelper.ShouldWrapInOperationCanceledException(exc, cancellationToken))
{
throw CancellationHelper.CreateOperationCanceledException(exc, cancellationToken);
}
#endif
finally
{
ctr.Dispose();
}
// If cancellation is requested and tears down the connection, it could cause the copy
// to end early but think it ended successfully. So we prioritize cancellation in this
// race condition, and if we find after the copy has completed that cancellation has
// been requested, we assume the copy completed due to cancellation and throw.
CancellationHelper.ThrowIfCancellationRequested(cancellationToken);
Finish();
}
private void Finish()
{
// We cannot reuse this connection, so close it.
_connection.Dispose();
_connection = null;
}
public override ValueTask WriteAsync(ReadOnlyMemory<byte> buffer, CancellationToken cancellationToken)
{
if (cancellationToken.IsCancellationRequested)
{
return new ValueTask(Task.FromCanceled(cancellationToken));
}
if (_connection == null)
{
return new ValueTask(Task.FromException(new IOException(SR.net_http_io_write)));
}
if (buffer.Length == 0)
{
return default;
}
ValueTask writeTask = _connection.WriteWithoutBufferingAsync(buffer);
return writeTask.IsCompleted ?
writeTask :
new ValueTask(WaitWithConnectionCancellationAsync(writeTask, cancellationToken));
}
public override Task FlushAsync(CancellationToken cancellationToken)
{
if (cancellationToken.IsCancellationRequested)
{
return Task.FromCanceled(cancellationToken);
}
if (_connection == null)
{
return Task.CompletedTask;
}
ValueTask flushTask = _connection.FlushAsync();
return flushTask.IsCompleted ?
flushTask.AsTask() :
WaitWithConnectionCancellationAsync(flushTask, cancellationToken);
}
private async Task WaitWithConnectionCancellationAsync(ValueTask task, CancellationToken cancellationToken)
{
CancellationTokenRegistration ctr = _connection.RegisterCancellation(cancellationToken);
try
{
await task.ConfigureAwait(false);
}
#if MONOTOUCH_WATCH
catch (Exception exc)
{
if (CancellationHelper.ShouldWrapInOperationCanceledException(exc, cancellationToken))
{
throw CancellationHelper.CreateOperationCanceledException(exc, cancellationToken);
}
throw;
}
#else
catch (Exception exc) when (CancellationHelper.ShouldWrapInOperationCanceledException(exc, cancellationToken))
{
throw CancellationHelper.CreateOperationCanceledException(exc, cancellationToken);
}
#endif
finally
{
ctr.Dispose();
}
}
}
}
}
|
