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[Instrumentation.AWSLambda] Fix AoT warnings #1544

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Jan 24, 2024
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[Instrumentation.AWSLambda] Fix AoT warnings #1544

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187ac3c
[Instrumentation.AWSLambda] Fix AoT warnings
martincostello Jan 22, 2024
fad055b
Fix AoT test app
martincostello Jan 23, 2024
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4 changes: 4 additions & 0 deletions src/OpenTelemetry.Instrumentation.AWSLambda/CHANGELOG.md
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Expand Up @@ -11,6 +11,10 @@
([#1295](https://github.com/open-telemetry/opentelemetry-dotnet-contrib/pull/1295))
* BREAKING: Target `net6.0` instead of `netstandard2.0`
([#1545](https://github.com/open-telemetry/opentelemetry-dotnet-contrib/pull/1545))
* Add support for native AoT.
`Amazon.Lambda.*` NuGet package dependencies have been upgraded, see package
dependencies for details.
([#1544](https://github.com/open-telemetry/opentelemetry-dotnet-contrib/pull/1544))

## 1.2.0-beta.1

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4 changes: 2 additions & 2 deletions src/OpenTelemetry.Instrumentation.AWSLambda/Implementation/AWSMessagingUtils.cs
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Expand Up @@ -5,9 +5,9 @@
using System.Collections.Generic;
using System.Diagnostics;
using System.Linq;
using System.Text.Json;
using Amazon.Lambda.SNSEvents;
using Amazon.Lambda.SQSEvents;
using Newtonsoft.Json;
using OpenTelemetry.Context.Propagation;

namespace OpenTelemetry.Instrumentation.AWSLambda.Implementation;
Expand Down Expand Up @@ -132,7 +132,7 @@ internal static PropagationContext ExtractParentContext(SNSEvent.SNSMessage? mes
{
try
{
snsMessage = JsonConvert.DeserializeObject<SNSEvent.SNSMessage>(body);
snsMessage = JsonSerializer.Deserialize(body, SourceGenerationContext.Default.SNSMessage);
}
catch (Exception)
{
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9 changes: 4 additions & 5 deletions src/OpenTelemetry.Instrumentation.AWSLambda/OpenTelemetry.Instrumentation.AWSLambda.csproj
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Expand Up @@ -8,12 +8,11 @@
</PropertyGroup>

<ItemGroup>
<PackageReference Include="Amazon.Lambda.APIGatewayEvents" Version="2.4.1" />
<PackageReference Include="Amazon.Lambda.Core" Version="1.2.0" />
<PackageReference Include="Amazon.Lambda.SNSEvents" Version="2.0.0" />
<PackageReference Include="Amazon.Lambda.SQSEvents" Version="2.1.0" />
<PackageReference Include="Amazon.Lambda.APIGatewayEvents" Version="2.7.0" />
<PackageReference Include="Amazon.Lambda.Core" Version="2.2.0" />
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@Oberon00 Oberon00 Jan 23, 2024 •
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Is raising the lower bound of these dependencies necessary? In particular this one from major version 1 to 2? After all, these define which versions we can instrument. If so, please add a changelog entry (Sth like: Amazon Lambda package Versions below 2.1 no longer supported, see package dependencies for details)

(Or maybe this dependency was even already overridden by a transitive dependency through another Amazon.Lambda.* dependency where we were already using 2.x?)

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These versions all correlate to the versions that first introduced support for native AoT: CHANGELOG.

Version 2.1.0 of Amazon.Lambda.Core is the first version that added explicit support for net6.0, which was required by the changes asked for in #1545, and the only release since then was the 2.2.0 release for net8.0 support that resolves the native AoT warnings.

Based on that, I think these are reasonable increases to require of users while also making this assembly usable without trim warnings in native AoT applications. There were also already breaking changes listed in the CHANGELOG for this library before this PR or #1545.

Thoughts @normj?

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@Oberon00 Oberon00 Jan 23, 2024 •
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while also making this assembly usable without trim warnings in native AoT applications

I wonder, because I assume the following:

  1. Users of the instrumentation should still have their own dependencies on Lambda packages and not rely on transitive dependencies here (unfortunately no implementation/api distinction exists in Nuget like in Java Gradle modules)
  2. If users want AoT or trimming, they can & should upgrade their own dependencies as needed. The library we release only specifies a lower bound.

Based on what you write with the .NET 6 support, an upgrade to 2.1 is totally reasonable without question, but I wonder about 2.2.

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I can downgrade it a bit in my native AoT Lambda using .NET 8 and see if I get any IL warnings (martincostello/alexa-london-travel#1020) or not.

My library does already specify its own dependencies for the Lambda assemblies it needs, but I don't use API Gateway, SNS or SQS, but I get all of those dependencies via this library transiently. Needing the end-user to manually upgrade the transient dependencies to get it to work properly for native AoT isn't ideal.

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@Oberon00 Oberon00 Jan 23, 2024 •
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but I don't use API Gateway, SNS or SQS, but I get all of those dependencies via this library transiently

Good point. This is not ideal anyway. I don't think there is a way to have these as compile-only dependencies and then check at runtime if they are actually present? (But this of course goes way beyond the scope of this PR anyways)

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Norm might know some tricks for dealing with that as the core AWS SDKs have to do similar things for things like STS authentication via the built-in fallback credential providers, but yeah that's a bit of a spiral out of the original scope here 😅.

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Sorry I can't think of any special tricks here. The only difference between 2.1 and 2.2 for Amazon.Lambda.Core is updates to the project file to have the .NET 8 target and mark the package trimmable for .NET 8 if that makes you feel better taking the updated dependency.

<PackageReference Include="Amazon.Lambda.SNSEvents" Version="2.1.0" />
<PackageReference Include="Amazon.Lambda.SQSEvents" Version="2.2.0" />
<PackageReference Include="OpenTelemetry.Extensions.AWS" Version="1.3.0-beta.1" />
<PackageReference Include="Newtonsoft.Json" Version="13.0.3" />
</ItemGroup>

<ItemGroup>
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20 changes: 20 additions & 0 deletions src/OpenTelemetry.Instrumentation.AWSLambda/SourceGenerationContext.cs
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@@ -0,0 +1,20 @@
// Copyright The OpenTelemetry Authors
// SPDX-License-Identifier: Apache-2.0

using System.Text.Json.Serialization;
using Amazon.Lambda.SNSEvents;

namespace OpenTelemetry.Instrumentation.AWSLambda;

/// <summary>
/// "Source Generation" is feature added to System.Text.Json in .NET 6.0.
/// This is a performance optimization that avoids runtime reflection when performing serialization.
/// Serialization metadata will be computed at compile-time and included in the assembly.
/// <see href="https://learn.microsoft.com/dotnet/standard/serialization/system-text-json/source-generation-modes" />.
/// <see href="https://learn.microsoft.com/dotnet/standard/serialization/system-text-json/source-generation" />.
/// <see href="https://devblogs.microsoft.com/dotnet/try-the-new-system-text-json-source-generator/" />.
/// </summary>
[JsonSerializable(typeof(SNSEvent.SNSMessage))]
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internal sealed partial class SourceGenerationContext : JsonSerializerContext
{
}
4 changes: 2 additions & 2 deletions test/OpenTelemetry.AotCompatibility.TestApp/OpenTelemetry.AotCompatibility.TestApp.csproj
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Expand Up @@ -14,10 +14,10 @@
.github\workflows\ci.yml so that it runs for the project being added.
-->
<TrimmerRootAssembly Include="OpenTelemetry.Extensions" />
<TrimmerRootAssembly Include="OpenTelemetry.Extensions.AWS" />
<TrimmerRootAssembly Include="OpenTelemetry.Extensions.Enrichment" />
<TrimmerRootAssembly Include="OpenTelemetry.Instrumentation.Runtime" />
<TrimmerRootAssembly Include="OpenTelemetry.Instrumentation.AWSLambda" />
<TrimmerRootAssembly Include="OpenTelemetry.Instrumentation.EventCounters" />
<TrimmerRootAssembly Include="OpenTelemetry.Instrumentation.Runtime" />
<TrimmerRootAssembly Include="OpenTelemetry.Instrumentation.StackExchangeRedis" />
<TrimmerRootAssembly Include="OpenTelemetry.ResourceDetectors.AWS" />
<TrimmerRootAssembly Include="OpenTelemetry.ResourceDetectors.Azure" />
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