I have an ASP.NET Core Web API project and a separate service layer that contains business logic. I want to invoke an AWS Lambda function from my service layer (not directly from the API), and handle the result in my API. Also, I want to package and deploy the Lambda function using AWS CLI and integrate it into my existing CI/CD pipeline.

What I've done:

1. I added this Lambda function inside my service layer

   using Amazon.Lambda.Core;
   using System;
   using System.Collections.Generic;
   using Amazon.Lambda.Serialization.SystemTextJson;
   
   [assembly: LambdaSerializer(typeof(Amazon.Lambda.Serialization.SystemTextJson.DefaultLambdaJsonSerializer))]
   
   namespace MyLambdaFunction
   {
       public class MyLambda
       {
           private readonly object cacheLock = new object();
   
           public MyLambda()
           {
               // You can initialize services here if needed
           }
   
           public MyResponse FunctionHandler(DateTime fromDate, DateTime toDate, ILambdaContext context)
           {
               lock (cacheLock)
               {
                   // Logic to get data from cache or service if needed
                   MyResponse result = new MyResponse(); // Replace with actual data retrieval logic
                   return result;
               }
           }
       }
   }
   

2. Added the following Lambda invocation logic in the service layer of the API project:

   public class LambdaInvokerService
   {
       private readonly IAmazonLambda _lambdaClient;
   
       public LambdaInvokerService(IAmazonLambda lambdaClient)
       {
           _lambdaClient = lambdaClient;
       }
   
       public async Task<string> InvokeLambdaAsync(string functionName, object payload)
       {
           var request = new InvokeRequest
           {
               FunctionName = functionName,
               Payload = System.Text.Json.JsonSerializer.Serialize(payload)
           };
           var response = await _lambdaClient.InvokeAsync(request);
           return new StreamReader(response.Payload).ReadToEnd();
       }
   }
   

Questions:

1. Is this a correct design for invoking Lambda from the service layer? Any improvements?
2. How can I deploy the Lambda function using AWS CLI, and how does it know which function to deploy (via .NET lambda package)?
3. How can I integrate Lambda deployment into my existing CI/CD pipeline automatically?