<Project Sdk="Microsoft.NET.Sdk">
 <PropertyGroup>
 <OutputType>Exe</OutputType>
 <TargetFramework>net6.0</TargetFramework>
 <ImplicitUsings>enable</ImplicitUsings>
 <Nullable>enable</Nullable>
 <AWSProjectType>Lambda</AWSProjectType>
 <AssemblyName>bootstrap</AssemblyName>
 <!-- This property makes the build directory similar to a publish directory and helps the AWS .NET Lambda Mock Test Tool find project dependencies. -->
 <CopyLocalLockFileAssemblies>true</CopyLocalLockFileAssemblies>
 <!-- 
		Enable trimming to reduce package size of self contained publish which can reduce cold starts. Trimming alters
		the .NET assemblies put in the deployment package. Additional runtime testing is required to make sure trimming
		does not have any unattended consequences.

	<PublishTrimmed>true</PublishTrimmed>
	-->
 <!-- Generate ready to run images during publishing to improve cold start time. -->
 <PublishReadyToRun>true</PublishReadyToRun>
 </PropertyGroup>
 <!-- 
 When publishing Lambda functions for ARM64 to the provided.al2 runtime a newer version of libicu needs to be included
 in the deployment bundle because .NET requires a newer version of libicu then is preinstalled with Amazon Linux 2.
 -->
 <ItemGroup Condition="'$(RuntimeIdentifier)' == 'linux-arm64'">
 <RuntimeHostConfigurationOption Include="System.Globalization.AppLocalIcu" Value="68.2.0.9" />
 <PackageReference Include="Microsoft.ICU.ICU4C.Runtime" Version="68.2.0.9" />
 </ItemGroup>
 <ItemGroup>
 <PackageReference Include="Amazon.Lambda.RuntimeSupport" Version="1.8.0" />
 <PackageReference Include="Amazon.Lambda.Core" Version="2.1.0" />
 <PackageReference Include="Amazon.Lambda.Serialization.SystemTextJson" Version="2.3.0" />
 </ItemGroup>
</Project>

using Amazon.Lambda.Core;
using Amazon.Lambda.RuntimeSupport;
using Amazon.Lambda.Serialization.SystemTextJson;
namespace AWSLambdaCustomRuntimeNet6;
public class Function
{
 /// <summary>
 /// The main entry point for the custom runtime.
 /// </summary>
 /// <param name="args"></param>
 private static async Task Main(string[] args)
 {
 Func<string, ILambdaContext, string> handler = FunctionHandler;
 await LambdaBootstrapBuilder.Create(handler, new DefaultLambdaJsonSerializer())
 .Build()
 .RunAsync();
 }
 /// <summary>
 /// A simple function that takes a string and does a ToUpper
 ///
 /// To use this handler to respond to an AWS event, reference the appropriate package from 
 /// https://github.com/aws/aws-lambda-dotnet#events
 /// and change the string input parameter to the desired event type.
 /// </summary>
 /// <param name="input"></param>
 /// <param name="context"></param>
 /// <returns></returns>
 public static string FunctionHandler(string input, ILambdaContext context)
 {
 return input.ToUpper();
 }
}

{
 "Information" : [
 "This file provides default values for the deployment wizard inside Visual Studio and the AWS Lambda commands added to the .NET Core CLI.",
 "To learn more about the Lambda commands with the .NET Core CLI execute the following command at the command line in the project root directory.",
 "dotnet lambda help",
 "All the command line options for the Lambda command can be specified in this file."
 ],
 "profile" : "default",
 "region" : "us-east-2",
 "configuration" : "Release",
 "function-runtime" : "provided.al2",
 "function-memory-size" : 256,
 "function-timeout" : 30,
 "function-handler" : "bootstrap",
 "msbuild-parameters" : "--self-contained true",
 "framework" : "net6.0",
 "function-name" : "TestCustomRuntimeFunction",
 "package-type" : "Zip",
 "function-role" : "arn:aws:iam::<<account-id>>:role/lambda_exec_TestCustomRuntimeFunction",
 "function-architecture" : "x86_64",
 "tracing-mode" : "PassThrough",
 "environment-variables" : "",
 "image-tag" : ""
}

Created IAM Role lambda_exec_TestCustomRuntimeFunction
Attached policy AWSLambdaExecute to role lambda_exec_TestCustomRuntimeFunction
Created IAM role arn:aws:iam::<<account-id>>:role/lambda_exec_TestCustomRuntimeFunction with managed policy AWSLambdaExecute
Waiting for new IAM Role to propagate to AWS regions
Executing publish command
... invoking 'dotnet publish', working folder '<<Path-to-project>>\AWSLambdaCustomRuntimeNet6\AWSLambdaCustomRuntimeNet6\bin\Release\net6.0\publish'
... dotnet publish --output "<<Path-to-project>>\AWSLambdaCustomRuntimeNet6\AWSLambdaCustomRuntimeNet6\bin\Release\net6.0\publish" --configuration "Release" --framework "net6.0" --self-contained true /p:GenerateRuntimeConfigurationFiles=true --runtime linux-x64
... publish: Microsoft (R) Build Engine version 17.1.1+a02f73656 for .NET
... publish: Copyright (C) Microsoft Corporation. All rights reserved.
... publish: Determining projects to restore...
... publish: Restored <<Path-to-project>>\AWSLambdaCustomRuntimeNet6\AWSLambdaCustomRuntimeNet6\AWSLambdaCustomRuntimeNet6.csproj (in 431 ms).
... publish: AWSLambdaCustomRuntimeNet6 -> <<Path-to-project>>\AWSLambdaCustomRuntimeNet6\AWSLambdaCustomRuntimeNet6\bin\Release\net6.0\linux-x64\bootstrap.dll
... publish: AWSLambdaCustomRuntimeNet6 -> <<Path-to-project>>\AWSLambdaCustomRuntimeNet6\AWSLambdaCustomRuntimeNet6\bin\Release\net6.0\publish\
Zipping publish folder <<Path-to-project>>\AWSLambdaCustomRuntimeNet6\AWSLambdaCustomRuntimeNet6\bin\Release\net6.0\publish to <<Path-to-project>>\AWSLambdaCustomRuntimeNet6\AWSLambdaCustomRuntimeNet6\bin\Release\net6.0\AWSLambdaCustomRuntimeNet6.zip
... zipping: Amazon.Lambda.Core.dll
... zipping: Amazon.Lambda.RuntimeSupport.dll
... zipping: Amazon.Lambda.Serialization.SystemTextJson.dll
... zipping: bootstrap
... zipping: bootstrap.deps.json
... zipping: bootstrap.dll
... zipping: bootstrap.pdb
... zipping: bootstrap.runtimeconfig.json
... zipping: createdump
... zipping: libclrjit.so
... zipping: libcoreclr.so
... zipping: libcoreclrtraceptprovider.so
... zipping: libdbgshim.so
... zipping: libhostfxr.so
... zipping: libhostpolicy.so
... zipping: libmscordaccore.so
... zipping: libmscordbi.so
...
...
...
... zipping: System.Xml.Serialization.dll
... zipping: System.Xml.XDocument.dll
... zipping: System.Xml.XmlDocument.dll
... zipping: System.Xml.XmlSerializer.dll
... zipping: System.Xml.XPath.dll
... zipping: System.Xml.XPath.XDocument.dll
... zipping: WindowsBase.dll
Created publish archive (<<Path-to-project>>\AWSLambdaCustomRuntimeNet6\AWSLambdaCustomRuntimeNet6\bin\Release\net6.0\AWSLambdaCustomRuntimeNet6.zip).
Creating new Lambda function TestCustomRuntimeFunction
New Lambda function created
Config settings saved to <<Path-to-project>>\AWSLambdaCustomRuntimeNet6\AWSLambdaCustomRuntimeNet6\aws-lambda-tools-defaults.json