AWSLambdaFunction.EntryPoint 1.0.1

AWSLambdaFunction.EntryPoint

The AWSLambdaFunction.EntryPoint NuGet package simplifies the creation of AWS Lambda functions in .NET 8.0 by allowing developers to abstract away the boilerplate Main method and focus on the business logic. This package introduces a declarative approach to define Lambda entry points using attributes and interfaces.

Defining Your Lambda Function

• Implement the ILambdaHandler<TRequest, TResponse> Interface: This interface requires you to define a Handler property, which is a function that takes a request of type TRequest and an ILambdaContext, and returns a response of type TResponse.
• Annotate Your Class with LambdaEntryPointAttribute: Specify the request and response types for your Lambda function by annotating your class with the LambdaEntryPointAttribute.

Example

Here's a simple example of a Lambda function that accepts a string request and returns a JSON object:

using Amazon.Lambda.Core;
using Newtonsoft.Json.Linq;
using AWSLambdaFunction.EntryPoint;
using AWSLambdaFunction.EntryPoint.Attributes;

[LambdaEntryPoint(typeof(string), typeof(JToken))]
public class LambdaFunction : ILambdaHandler<string, JToken>
{
    public Func<string, ILambdaContext, JToken> Handler => Run;

    private JToken Run(string message, ILambdaContext context)
    {
        var data = new JObject
        {
            ["message"] = message
        };

        context.Logger.LogLine($"Received message: {message}");
        return data;
    }
}