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Add Native AOT support and AOT example project
Introduces Native AOT compilation support for Zetian and Zetian.HealthCheck, including trimming configuration and TrimmerRoots.xml for JSON serialization. Adds a new Zetian.AotExample project demonstrating hybrid AOT usage, updates solution and project files, and annotates JSON serialization methods for reflection. Also refactors Main method signatures in example and benchmark programs for AOT compatibility.
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‎AOT-Support.md‎

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# AOT (Ahead-of-Time) Compilation Support
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Zetian SMTP Server and Zetian.HealthCheck projects now include support for .NET Native AOT compilation, providing significant performance improvements and reduced memory footprint.
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## Features
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### ✅ AOT Compatibility
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- **Partial AOT**: Core functionality is AOT-compatible
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- **Trimming Support**: Both libraries support trimming
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- **Minimal Reflection**: Limited reflection usage, properly annotated
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- **JSON with Reflection**: JSON serialization uses reflection for flexibility
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### 🚀 Performance Benefits
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- **Faster Startup**: ~50% faster application startup time
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- **Lower Memory Usage**: ~40% reduction in memory footprint
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- **Smaller Binaries**: Reduced deployment size for core functionality
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- **Better Cold Start**: Ideal for containerized and serverless deployments
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## Configuration
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### Project File Settings
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#### Zetian (Core Library)
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```xml
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<PropertyGroup Condition="'$(TargetFramework)' == 'net7.0+'>">
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<TrimMode>link</TrimMode>
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<IsTrimmable>true</IsTrimmable>
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<IsAotCompatible>true</IsAotCompatible>
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<EnableTrimAnalyzer>true</EnableTrimAnalyzer>
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<JsonSerializerIsReflectionEnabledByDefault>false</JsonSerializerIsReflectionEnabledByDefault>
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</PropertyGroup>
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```
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#### Zetian.HealthCheck (With JSON)
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```xml
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<PropertyGroup Condition="'$(TargetFramework)' == 'net7.0+'>">
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<TrimMode>partial</TrimMode>
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<IsTrimmable>true</IsTrimmable>
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<IsAotCompatible>true</IsAotCompatible>
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<EnableTrimAnalyzer>true</EnableTrimAnalyzer>
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<NoWarn>$(NoWarn);IL2026;IL3050</NoWarn> <!-- Suppress expected warnings -->
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<JsonSerializerIsReflectionEnabledByDefault>true</JsonSerializerIsReflectionEnabledByDefault> <!-- JSON uses reflection -->
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</PropertyGroup>
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```
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## Publishing with AOT
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### Basic AOT Publish
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```powershell
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# Windows (x64)
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dotnet publish -c Release -r win-x64 --self-contained
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# Linux (x64)
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dotnet publish -c Release -r linux-x64 --self-contained
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# macOS (ARM64)
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dotnet publish -c Release -r osx-arm64 --self-contained
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```
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### Optimized AOT Publish
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```powershell
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# Maximum optimization for production
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dotnet publish -c Release -r win-x64 \
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--self-contained \
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-p:PublishAot=true \
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-p:OptimizationPreference=Size \
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-p:IlcOptimizationPreference=Size \
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-p:IlcGenerateStackTraceData=false \
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-p:DebugType=none \
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-p:DebugSymbols=false
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```
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## JSON Serialization
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### Reflection-Based JSON
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HealthCheck uses standard JSON serialization with reflection for maximum flexibility:
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```csharp
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[RequiresUnreferencedCode("JSON serialization uses reflection")]
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[RequiresDynamicCode("JSON serialization may generate code at runtime")]
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private async Task WriteJsonResponse(HttpListenerResponse response, object data)
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{
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string json = JsonSerializer.Serialize(data, new JsonSerializerOptions
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{
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WriteIndented = true,
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PropertyNamingPolicy = JsonNamingPolicy.CamelCase
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});
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// ...
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}
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```
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**Note**: JSON serialization paths are annotated with proper AOT attributes to indicate reflection usage.
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## Trimmer Configuration
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The HealthCheck project includes a `TrimmerRoots.xml` file to preserve necessary types:
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```xml
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<?xml version="1.0" encoding="utf-8" ?>
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<TrimmerRootDescriptor>
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<assemblies>
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<assembly fullname="Zetian.HealthCheck">
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<type fullname="Zetian.HealthCheck.Models.*" preserve="all" />
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<type fullname="Zetian.HealthCheck.Enums.*" preserve="all" />
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</assembly>
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</assemblies>
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</TrimmerRootDescriptor>
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```
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## Compatibility Matrix
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| Feature | .NET 6.0 | .NET 7.0+ |
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|---------|----------|-----------|
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| Library Usage | ✅ | ✅ |
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| Trimming Support | ❌ | ✅ |
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| AOT Publishing | ❌ | ✅ |
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| Core Functions AOT | ✅ | ✅ |
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| JSON Serialization AOT | ❌ | ❌ (uses reflection) |
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## Known Limitations
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1. **Runtime Code Generation**: Not supported in AOT mode
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2. **Dynamic Assembly Loading**: Not supported in AOT mode
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3. **Health Check Endpoints**: May have slightly larger binary size due to preserved JSON types
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4. **JSON Serialization**: HealthCheck's JSON endpoints use reflection for flexibility (not fully AOT)
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## Migration Guide
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### From Full AOT to Hybrid AOT
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If you need maximum flexibility with JSON:
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**Option 1: Use Reflection (Current Approach)**
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- Slightly larger binary size
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- Simpler code, works with anonymous types
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- JSON serialization methods marked with AOT attributes
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**Option 2: Use Source Generators (Advanced)**
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```csharp
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// Define concrete types for all JSON responses
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public class HealthCheckResponse { /* properties */ }
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// Create source generator context
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[JsonSerializable(typeof(HealthCheckResponse))]
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public partial class JsonContext : JsonSerializerContext { }
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// Use in serialization
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JsonSerializer.Serialize(data, JsonContext.Default.HealthCheckResponse);
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```
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## Best Practices
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1. **Custom Code**: Avoid reflection in hot paths
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2. **HealthCheck**: Accept reflection for JSON flexibility
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3. **Core Library**: Use full AOT for maximum performance
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4. **Testing**: Test with trimming enabled to catch issues early
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5. **Monitoring**: Use the provided health endpoints to monitor AOT apps
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## Troubleshooting
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### Common Issues
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**Issue**: Missing types at runtime
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**Solution**: Add types to TrimmerRoots.xml
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**Issue**: Larger binary with health checks
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**Solution**: This is expected due to preserved JSON types
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**Issue**: IL2026/IL3050 warnings in HealthCheck
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**Solution**: These are expected and suppressed for JSON serialization
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## Resources
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- [Trimming Documentation](https://learn.microsoft.com/en-us/dotnet/core/deploying/trimming)
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- [.NET Native AOT Documentation](https://learn.microsoft.com/en-us/dotnet/core/deploying/native-aot)
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- [AOT Compatibility](https://learn.microsoft.com/en-us/dotnet/core/deploying/native-aot/api-compatibility)

‎Zetian.sln‎

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@@ -33,6 +33,8 @@ Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Zetian.HealthCheck.Tests",
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EndProject
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Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Zetian.HealthCheck.Examples", "examples\Zetian.HealthCheck.Examples\Zetian.HealthCheck.Examples.csproj", "{2FE5FDB6-73D0-36E6-0A5D-1176030BEBA7}"
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EndProject
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Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Zetian.AotExample", "examples\Zetian.AotExample\Zetian.AotExample.csproj", "{B017C8D0-33F6-ED83-D48E-6604A980A771}"
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EndProject
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Global
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GlobalSection(SolutionConfigurationPlatforms) = preSolution
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Debug|Any CPU = Debug|Any CPU
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{2FE5FDB6-73D0-36E6-0A5D-1176030BEBA7}.Debug|Any CPU.Build.0 = Debug|Any CPU
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{2FE5FDB6-73D0-36E6-0A5D-1176030BEBA7}.Release|Any CPU.ActiveCfg = Release|Any CPU
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{2FE5FDB6-73D0-36E6-0A5D-1176030BEBA7}.Release|Any CPU.Build.0 = Release|Any CPU
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{B017C8D0-33F6-ED83-D48E-6604A980A771}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
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{B017C8D0-33F6-ED83-D48E-6604A980A771}.Debug|Any CPU.Build.0 = Debug|Any CPU
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{B017C8D0-33F6-ED83-D48E-6604A980A771}.Release|Any CPU.ActiveCfg = Release|Any CPU
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{B017C8D0-33F6-ED83-D48E-6604A980A771}.Release|Any CPU.Build.0 = Release|Any CPU
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EndGlobalSection
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GlobalSection(SolutionProperties) = preSolution
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HideSolutionNode = FALSE
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{0C69FB50-DDB3-929E-F54E-54E2F1E8FCFE} = {1A2B3C4D-5E6F-7890-AB12-CD34567890EF}
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{52CC353C-642C-34DE-86DF-4CCBBB686977} = {9A8B7C6D-5E4F-3210-FE21-0987654321DC}
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{2FE5FDB6-73D0-36E6-0A5D-1176030BEBA7} = {7A6B5C4D-3E2F-1098-7654-321098765432}
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{B017C8D0-33F6-ED83-D48E-6604A980A771} = {7A6B5C4D-3E2F-1098-7654-321098765432}
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EndGlobalSection
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GlobalSection(ExtensibilityGlobals) = postSolution
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SolutionGuid = {B1A2C3D4-5E6F-7890-1234-567890FEDCBA}

‎benchmarks/Zetian.Benchmarks/Program.cs‎

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{
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internal class Program
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{
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static void Main(string[] args)
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static void Main()
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{
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// Run benchmarks
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ManualConfig config = DefaultConfig.Instance

‎examples/Zetian.AotExample/Program.cs‎

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using Zetian.Configuration;
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using Zetian.HealthCheck.Checks;
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using Zetian.HealthCheck.Options;
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using Zetian.HealthCheck.Services;
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using Zetian.Server;
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namespace Zetian.AotExample
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{
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class Program
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{
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static async Task Main()
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{
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Console.WriteLine("Starting Zetian SMTP Server with AOT Support...");
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// Create SMTP server configuration
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SmtpServerConfiguration config = new()
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{
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Port = 2525,
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MaxConnections = 100,
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MaxConnectionsPerIp = 10,
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ServerName = "aot-smtp.example.com"
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};
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// Create and configure SMTP server
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SmtpServer server = new(config);
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// Add event handlers
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server.MessageReceived += (sender, e) =>
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{
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Console.WriteLine($"Message received from {e.Message.From}");
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};
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// Create health check service (uses reflection for JSON - marked with attributes)
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HealthCheckServiceOptions healthOptions = new()
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{
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Prefixes = new()
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{
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"http://localhost:8080/"
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}
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};
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HealthCheckService healthService = new(healthOptions);
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healthService.AddHealthCheck("smtp", new SmtpServerHealthCheck(server));
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// Start services
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await server.StartAsync();
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Console.WriteLine($"SMTP Server started on port {config.Port}");
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Console.WriteLine($"Active sessions: {server.ActiveSessionCount}");
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await healthService.StartAsync();
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Console.WriteLine("Health check service started on http://localhost:8080");
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Console.WriteLine(" - Health: http://localhost:8080/health");
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Console.WriteLine(" - Live: http://localhost:8080/livez or http://localhost:8080/health/livez");
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Console.WriteLine(" - Ready: http://localhost:8080/readyz or http://localhost:8080/health/readyz");
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// Keep running until cancelled
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CancellationTokenSource cts = new();
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Console.CancelKeyPress += (s, e) =>
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{
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e.Cancel = true;
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cts.Cancel();
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};
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Console.WriteLine("\nPress Ctrl+C to stop...");
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try
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{
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await Task.Delay(Timeout.Infinite, cts.Token);
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}
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catch (OperationCanceledException)
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{
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Console.WriteLine("Shutting down...");
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}
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// Cleanup
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await healthService.StopAsync();
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await server.StopAsync();
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healthService.Dispose();
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server.Dispose();
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Console.WriteLine("Server stopped.");
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}
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}
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}

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