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Add Exception HResult to mechanism data #4029

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Merged
merged 8 commits into from
Mar 17, 2025
Merged

Add Exception HResult to mechanism data #4029

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6e45134
impl #3939
Lightczx Mar 8, 2025
b2a029b
Updated tests and changelog
jamescrosswell Mar 14, 2025
7ae51b8
Update CHANGELOG.md
jamescrosswell Mar 14, 2025
dcdbbf7
Merge branch 'main' into main
jamescrosswell Mar 14, 2025
695d32d
Merge branch 'main' into pr/4029
jamescrosswell Mar 16, 2025
07e3d61
Update CHANGELOG.md
jamescrosswell Mar 16, 2025
332d0e4
Verify tests
jamescrosswell Mar 16, 2025
db59ed4
Merge branch 'main' into main
jamescrosswell Mar 16, 2025
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3 changes: 3 additions & 0 deletions src/Sentry/Internal/MainExceptionProcessor.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -199,6 +199,9 @@ private static Mechanism GetMechanism(Exception exception, int id, int? parentId
exception.Data.Remove(Mechanism.DescriptionKey);
}

// Add HResult to mechanism data before adding exception data, so that it can be overridden.
mechanism.Data["HResult"] = $"0x{exception.HResult:X8}";
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Could you add a test too please?

We have tests already which you base off of:

sentry-dotnet/test/Sentry.Tests/Internals/MainExceptionProcessorTests.cs

Lines 15 to 25 in 47df982

public void Process_ExceptionsWithoutData_MechanismDataIsEmpty()
{
var sut = _fixture.GetSut();
var evt = new SentryEvent();
var ex = GetHandledException();
sut.Process(ex, evt);
var sentryException = evt.SentryExceptions!.Single();
Assert.Empty(sentryException.Mechanism!.Data);
}

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Oh one more note: https://learn.microsoft.com/en-us/dotnet/api/system.exception.hresult?view=net-9.0

How about we don't add the property if HResult is not default?

Otherwise we'll be getting HResult: 0 for lots of stuff

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@whiskhub whiskhub Mar 8, 2025 •
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The chance for HResult being 0 in an exception is effectively 0 😅 because 0 means S_OK, so success.
The default HResult in C# is 0x80131500 COR_E_EXCEPTION.

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Yes, unless someone manually change the HResult to 0, the value will always be like 0x800... . Every .NET BCL Exception have different default HResult.

So we can assume 0 is also meaningful that something is going wrong here (Deliberately set by developer or library author, although almost no one will do so).

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Could you add a test too please?

Not familiar about that, maybe someone else can help?

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@Lightczx Lightczx Mar 10, 2025 •
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-2146233088 is 0x80131500 which is COR_E_EXCEPTION

https://github.com/dotnet/runtime/blob/d17420560540e4184a78f431de8341f747068c4f/src/coreclr/pal/prebuilt/inc/corerror.h#L227

If a Exception is throw by BCL, then it may or may not be mapped/wrapped.
Especially for HttpRequestException, if the inner exception is IOException, the HResult is different from which inner exception is SocketException

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I would avoid adding any filtering here. Any HResult value may give some information. I don‘t think it will confuse anyone, since already today the HResult value can be seen on any exception in the debugger.

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I've written a short test. Feel free to commit it:

[Fact]
public void Process_ExceptionWithHResult_MechanismDataIsPopulated()
{
	var sut = _fixture.GetSut();
	var evt = new SentryEvent();
	const int RPC_E_WRONG_THREAD = -2147417842;
	const string RPC_E_WRONG_THREAD_MSG = "The application called an interface that was marshalled for a different thread.";
	var ex = new System.Runtime.InteropServices.COMException(RPC_E_WRONG_THREAD_MSG, RPC_E_WRONG_THREAD);

	sut.Process(ex, evt);

	var sentryException = evt.SentryExceptions!.Single();
	var data = sentryException.Mechanism!.Data;

	Assert.Contains(data, pair => pair.Key == "HResult" && pair.Value.Equals("0x8001010E"));
}

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-2146233088 is 0x80131500 which is COR_E_EXCEPTION
https://github.com/dotnet/runtime/blob/d17420560540e4184a78f431de8341f747068c4f/src/coreclr/pal/prebuilt/inc/corerror.h#L227

@bruno-garcia does it make sense to pull that mapping into the issues details page?

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pull that mapping into the issues details page

Not quite, that's not the full set of the HRESULT, and COM/WinRT/Win32 components can have custom values.


// Copy remaining exception data to mechanism data.
foreach (var key in exception.Data.Keys.OfType<string>())
{
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