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BrennanConroyBrennanConroy
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Use PipeReader JsonSerializer overloads (#62895)
* Use PipeReader JsonSerializer overloads * linker * fb
1 parent 50e6b08 commit 92f4a6e

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+136
-44
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5 files changed

+136
-44
lines changed

‎src/Http/Http.Extensions/src/HttpRequestJsonExtensions.cs

Lines changed: 109 additions & 26 deletions
Original file line numberDiff line numberDiff line change
@@ -23,6 +23,10 @@ public static class HttpRequestJsonExtensions
2323
"Use the overload that takes a JsonTypeInfo or JsonSerializerContext, or make sure all of the required types are preserved.";
2424
private const string RequiresDynamicCodeMessage = "JSON serialization and deserialization might require types that cannot be statically analyzed and need runtime code generation. " +
2525
"Use the overload that takes a JsonTypeInfo or JsonSerializerContext for native AOT applications.";
26+
// Fallback to the stream-based overloads for JsonSerializer.DeserializeAsync
27+
// This is to give users with custom JsonConverter implementations the chance to update their
28+
// converters to support ReadOnlySequence<T> if needed while still keeping their apps working.
29+
private static readonly bool _useStreamJsonOverload = AppContext.TryGetSwitch("Microsoft.AspNetCore.UseStreamBasedJsonParsing", out var isEnabled) && isEnabled;
2630

2731
/// <summary>
2832
/// Read JSON from the request and deserialize to the specified type.
@@ -68,15 +72,33 @@ public static class HttpRequestJsonExtensions
6872
options ??= ResolveSerializerOptions(request.HttpContext);
6973

7074
var encoding = GetEncodingFromCharset(charset);
71-
var (inputStream, usesTranscodingStream) = GetInputStream(request.HttpContext, encoding);
75+
Stream? inputStream = null;
76+
ValueTask<TValue?> deserializeTask;
7277

7378
try
7479
{
75-
return await JsonSerializer.DeserializeAsync<TValue>(inputStream, options, cancellationToken);
80+
if (encoding == null || encoding.CodePage == Encoding.UTF8.CodePage)
81+
{
82+
if (_useStreamJsonOverload)
83+
{
84+
deserializeTask = JsonSerializer.DeserializeAsync<TValue>(request.Body, options, cancellationToken);
85+
}
86+
else
87+
{
88+
deserializeTask = JsonSerializer.DeserializeAsync<TValue>(request.BodyReader, options, cancellationToken);
89+
}
90+
}
91+
else
92+
{
93+
inputStream = Encoding.CreateTranscodingStream(request.Body, encoding, Encoding.UTF8, leaveOpen: true);
94+
deserializeTask = JsonSerializer.DeserializeAsync<TValue>(inputStream, options, cancellationToken);
95+
}
96+
97+
return await deserializeTask;
7698
}
7799
finally
78100
{
79-
if (usesTranscodingStream)
101+
if (inputStream is not null)
80102
{
81103
await inputStream.DisposeAsync();
82104
}
@@ -106,15 +128,33 @@ public static class HttpRequestJsonExtensions
106128
}
107129

108130
var encoding = GetEncodingFromCharset(charset);
109-
var (inputStream, usesTranscodingStream) = GetInputStream(request.HttpContext, encoding);
131+
Stream? inputStream = null;
132+
ValueTask<TValue?> deserializeTask;
110133

111134
try
112135
{
113-
return await JsonSerializer.DeserializeAsync(inputStream, jsonTypeInfo, cancellationToken);
136+
if (encoding == null || encoding.CodePage == Encoding.UTF8.CodePage)
137+
{
138+
if (_useStreamJsonOverload)
139+
{
140+
deserializeTask = JsonSerializer.DeserializeAsync(request.Body, jsonTypeInfo, cancellationToken);
141+
}
142+
else
143+
{
144+
deserializeTask = JsonSerializer.DeserializeAsync(request.BodyReader, jsonTypeInfo, cancellationToken);
145+
}
146+
}
147+
else
148+
{
149+
inputStream = Encoding.CreateTranscodingStream(request.Body, encoding, Encoding.UTF8, leaveOpen: true);
150+
deserializeTask = JsonSerializer.DeserializeAsync(inputStream, jsonTypeInfo, cancellationToken);
151+
}
152+
153+
return await deserializeTask;
114154
}
115155
finally
116156
{
117-
if (usesTranscodingStream)
157+
if (inputStream is not null)
118158
{
119159
await inputStream.DisposeAsync();
120160
}
@@ -144,15 +184,33 @@ public static class HttpRequestJsonExtensions
144184
}
145185

146186
var encoding = GetEncodingFromCharset(charset);
147-
var (inputStream, usesTranscodingStream) = GetInputStream(request.HttpContext, encoding);
187+
Stream? inputStream = null;
188+
ValueTask<object?> deserializeTask;
148189

149190
try
150191
{
151-
return await JsonSerializer.DeserializeAsync(inputStream, jsonTypeInfo, cancellationToken);
192+
if (encoding == null || encoding.CodePage == Encoding.UTF8.CodePage)
193+
{
194+
if (_useStreamJsonOverload)
195+
{
196+
deserializeTask = JsonSerializer.DeserializeAsync(request.Body, jsonTypeInfo, cancellationToken);
197+
}
198+
else
199+
{
200+
deserializeTask = JsonSerializer.DeserializeAsync(request.BodyReader, jsonTypeInfo, cancellationToken);
201+
}
202+
}
203+
else
204+
{
205+
inputStream = Encoding.CreateTranscodingStream(request.Body, encoding, Encoding.UTF8, leaveOpen: true);
206+
deserializeTask = JsonSerializer.DeserializeAsync(inputStream, jsonTypeInfo, cancellationToken);
207+
}
208+
209+
return await deserializeTask;
152210
}
153211
finally
154212
{
155-
if (usesTranscodingStream)
213+
if (inputStream is not null)
156214
{
157215
await inputStream.DisposeAsync();
158216
}
@@ -206,15 +264,33 @@ public static class HttpRequestJsonExtensions
206264
options ??= ResolveSerializerOptions(request.HttpContext);
207265

208266
var encoding = GetEncodingFromCharset(charset);
209-
var (inputStream, usesTranscodingStream) = GetInputStream(request.HttpContext, encoding);
267+
Stream? inputStream = null;
268+
ValueTask<object?> deserializeTask;
210269

211270
try
212271
{
213-
return await JsonSerializer.DeserializeAsync(inputStream, type, options, cancellationToken);
272+
if (encoding == null || encoding.CodePage == Encoding.UTF8.CodePage)
273+
{
274+
if (_useStreamJsonOverload)
275+
{
276+
deserializeTask = JsonSerializer.DeserializeAsync(request.Body, type, options, cancellationToken);
277+
}
278+
else
279+
{
280+
deserializeTask = JsonSerializer.DeserializeAsync(request.BodyReader, type, options, cancellationToken);
281+
}
282+
}
283+
else
284+
{
285+
inputStream = Encoding.CreateTranscodingStream(request.Body, encoding, Encoding.UTF8, leaveOpen: true);
286+
deserializeTask = JsonSerializer.DeserializeAsync(inputStream, type, options, cancellationToken);
287+
}
288+
289+
return await deserializeTask;
214290
}
215291
finally
216292
{
217-
if (usesTranscodingStream)
293+
if (inputStream is not null)
218294
{
219295
await inputStream.DisposeAsync();
220296
}
@@ -248,15 +324,33 @@ public static class HttpRequestJsonExtensions
248324
}
249325

250326
var encoding = GetEncodingFromCharset(charset);
251-
var (inputStream, usesTranscodingStream) = GetInputStream(request.HttpContext, encoding);
327+
Stream? inputStream = null;
328+
ValueTask<object?> deserializeTask;
252329

253330
try
254331
{
255-
return await JsonSerializer.DeserializeAsync(inputStream, type, context, cancellationToken);
332+
if (encoding == null || encoding.CodePage == Encoding.UTF8.CodePage)
333+
{
334+
if (_useStreamJsonOverload)
335+
{
336+
deserializeTask = JsonSerializer.DeserializeAsync(request.Body, type, context, cancellationToken);
337+
}
338+
else
339+
{
340+
deserializeTask = JsonSerializer.DeserializeAsync(request.BodyReader, type, context, cancellationToken);
341+
}
342+
}
343+
else
344+
{
345+
inputStream = Encoding.CreateTranscodingStream(request.Body, encoding, Encoding.UTF8, leaveOpen: true);
346+
deserializeTask = JsonSerializer.DeserializeAsync(inputStream, type, context, cancellationToken);
347+
}
348+
349+
return await deserializeTask;
256350
}
257351
finally
258352
{
259-
if (usesTranscodingStream)
353+
if (inputStream is not null)
260354
{
261355
await inputStream.DisposeAsync();
262356
}
@@ -312,17 +406,6 @@ private static void ThrowContentTypeError(HttpRequest request)
312406
throw new InvalidOperationException($"Unable to read the request as JSON because the request content type '{request.ContentType}' is not a known JSON content type.");
313407
}
314408

315-
private static (Stream inputStream, bool usesTranscodingStream) GetInputStream(HttpContext httpContext, Encoding? encoding)
316-
{
317-
if (encoding == null || encoding.CodePage == Encoding.UTF8.CodePage)
318-
{
319-
return (httpContext.Request.Body, false);
320-
}
321-
322-
var inputStream = Encoding.CreateTranscodingStream(httpContext.Request.Body, encoding, Encoding.UTF8, leaveOpen: true);
323-
return (inputStream, true);
324-
}
325-
326409
private static Encoding? GetEncodingFromCharset(StringSegment charset)
327410
{
328411
if (charset.Equals("utf-8", StringComparison.OrdinalIgnoreCase))

‎src/Http/Http.Extensions/test/HttpRequestJsonExtensionsTests.cs

Lines changed: 1 addition & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -147,7 +147,7 @@ public async Task ReadFromJsonAsyncGeneric_WithCancellationToken_CancellationRai
147147
cts.Cancel();
148148

149149
// Assert
150-
await Assert.ThrowsAsync<TaskCanceledException>(async () => await readTask);
150+
await Assert.ThrowsAnyAsync<OperationCanceledException>(async () => await readTask);
151151
}
152152

153153
[Fact]

‎src/Http/Http.Extensions/test/RequestDelegateGenerator/RequestDelegateCreationTests.BindAsync.cs

Lines changed: 1 addition & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -254,7 +254,7 @@ public async Task BindAsyncWithBodyArgument()
254254
Assert.Equal("Write more tests!", todo!.Name);
255255
}
256256

257-
[Fact]
257+
[Fact(Skip = "Resetting Stream.Position to 0 doesn't work with StreamPipeReader currently.")]
258258
public async Task BindAsyncRunsBeforeBodyBinding()
259259
{
260260
Todo originalTodo = new()

‎src/Mvc/Mvc.Core/src/Formatters/SystemTextJsonInputFormatter.cs

Lines changed: 24 additions & 15 deletions
Original file line numberDiff line numberDiff line change
@@ -3,7 +3,6 @@
33

44
using System.Text;
55
using System.Text.Json;
6-
using Microsoft.AspNetCore.Http;
76
using Microsoft.Extensions.Logging;
87

98
namespace Microsoft.AspNetCore.Mvc.Formatters;
@@ -15,6 +14,7 @@ public partial class SystemTextJsonInputFormatter : TextInputFormatter, IInputFo
1514
{
1615
private readonly JsonOptions _jsonOptions;
1716
private readonly ILogger<SystemTextJsonInputFormatter> _logger;
17+
private readonly bool _useStreamJsonOverload;
1818

1919
/// <summary>
2020
/// Initializes a new instance of <see cref="SystemTextJsonInputFormatter"/>.
@@ -35,6 +35,11 @@ public SystemTextJsonInputFormatter(
3535
SupportedMediaTypes.Add(MediaTypeHeaderValues.ApplicationJson);
3636
SupportedMediaTypes.Add(MediaTypeHeaderValues.TextJson);
3737
SupportedMediaTypes.Add(MediaTypeHeaderValues.ApplicationAnyJsonSyntax);
38+
39+
// Fallback to the stream-based overloads for JsonSerializer.DeserializeAsync
40+
// This is to give users with custom JsonConverter implementations the chance to update their
41+
// converters to support ReadOnlySequence<T> if needed while still keeping their apps working.
42+
_useStreamJsonOverload = AppContext.TryGetSwitch("Microsoft.AspNetCore.UseStreamBasedJsonParsing", out var isEnabled) && isEnabled;
3843
}
3944

4045
/// <summary>
@@ -58,12 +63,27 @@ public sealed override async Task<InputFormatterResult> ReadRequestBodyAsync(
5863
ArgumentNullException.ThrowIfNull(encoding);
5964

6065
var httpContext = context.HttpContext;
61-
var (inputStream, usesTranscodingStream) = GetInputStream(httpContext, encoding);
6266

6367
object? model;
68+
Stream? inputStream = null;
6469
try
6570
{
66-
model = await JsonSerializer.DeserializeAsync(inputStream, context.ModelType, SerializerOptions);
71+
if (encoding.CodePage == Encoding.UTF8.CodePage)
72+
{
73+
if (_useStreamJsonOverload)
74+
{
75+
model = await JsonSerializer.DeserializeAsync(httpContext.Request.Body, context.ModelType, SerializerOptions);
76+
}
77+
else
78+
{
79+
model = await JsonSerializer.DeserializeAsync(httpContext.Request.BodyReader, context.ModelType, SerializerOptions);
80+
}
81+
}
82+
else
83+
{
84+
inputStream = Encoding.CreateTranscodingStream(httpContext.Request.Body, encoding, Encoding.UTF8, leaveOpen: true);
85+
model = await JsonSerializer.DeserializeAsync(inputStream, context.ModelType, SerializerOptions);
86+
}
6787
}
6888
catch (JsonException jsonException)
6989
{
@@ -89,7 +109,7 @@ public sealed override async Task<InputFormatterResult> ReadRequestBodyAsync(
89109
}
90110
finally
91111
{
92-
if (usesTranscodingStream)
112+
if (inputStream is not null)
93113
{
94114
await inputStream.DisposeAsync();
95115
}
@@ -123,17 +143,6 @@ private Exception WrapExceptionForModelState(JsonException jsonException)
123143
return new InputFormatterException(jsonException.Message, jsonException);
124144
}
125145

126-
private static (Stream inputStream, bool usesTranscodingStream) GetInputStream(HttpContext httpContext, Encoding encoding)
127-
{
128-
if (encoding.CodePage == Encoding.UTF8.CodePage)
129-
{
130-
return (httpContext.Request.Body, false);
131-
}
132-
133-
var inputStream = Encoding.CreateTranscodingStream(httpContext.Request.Body, encoding, Encoding.UTF8, leaveOpen: true);
134-
return (inputStream, true);
135-
}
136-
137146
private static partial class Log
138147
{
139148
[LoggerMessage(1, LogLevel.Debug, "JSON input formatter threw an exception: {Message}", EventName = "SystemTextJsonInputException")]

‎src/Mvc/Mvc.Core/src/Microsoft.AspNetCore.Mvc.Core.WarningSuppressions.xml

Lines changed: 1 addition & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -83,7 +83,7 @@
8383
<argument>ILLink</argument>
8484
<argument>IL2026</argument>
8585
<property name="Scope">member</property>
86-
<property name="Target">M:Microsoft.AspNetCore.Mvc.Formatters.SystemTextJsonInputFormatter.&lt;ReadRequestBodyAsync&gt;d__8.MoveNext</property>
86+
<property name="Target">M:Microsoft.AspNetCore.Mvc.Formatters.SystemTextJsonInputFormatter.&lt;ReadRequestBodyAsync&gt;d__9.MoveNext</property>
8787
</attribute>
8888
<attribute fullname="System.Diagnostics.CodeAnalysis.UnconditionalSuppressMessageAttribute">
8989
<argument>ILLink</argument>

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