Implement Lambda warmer

[michaeldimoudis]

No description provided.

[bsthomsen]

Hey @michaeldimoudis, what if you were to use the Amazon.Lambda.AspNetCoreServer.ApplicationLoadBalancerFunction. How would you implement this, it doesn't seem to have request.Resource Would you then just dissect the json body and check if it's a lambda warmer request?

[michaeldimoudis]

Hi @bsthomsen I'm not sure sorry as I haven't had to do this before. I'm guessing it should be possible though? However if you are using an ALB, why not make the health check your Lambda so you won't need a warmer then?

[bsthomsen]

Ended up resolving it like this, for ApplicationLoadBalancer:
https://gist.github.com/bsthomsen/f6397b1e171b91387c2a65bfb05169c5

[richardkeller411]

Thanks @bsthomsen!! I’ll try it out!

[richardkeller411]

I got your code to work but somehow cannot get a response correctly from the modified Lambda although routing and methods fire.

Method:

[HttpGet("get")]
[ProducesResponseType(typeof(void), (int)HttpStatusCode.BadRequest)]
public IActionResult Get()
{
LambdaLogger.Log("Test Get Fired");
return StatusCode(500, "TestAPI returned GET");
}

Logs:


04:23:13
Request does not contain ELB information but is derived from ApplicationLoadBalancerFunction.

04:23:13
[Debug] Amazon.Lambda.AspNetCoreServer.APIGatewayProxyFunction: ASP.NET Core Request PathBase: , Path: /api/test/get

04:23:13
ASP.NET Core Request PathBase: , Path: /api/test/get

04:23:13
Test Get Fired

04:23:13
[Debug] Amazon.Lambda.AspNetCoreServer.APIGatewayProxyFunction: Response Base 64 Encoded: False

I am trying to fire through the ApplicationGateway vs the ALB but thought methods should return anyways.

[bsthomsen]

@richardkeller411 if you use the ApiGateway you should use the code in this pull request instead. The code I wrote is for when you're using ApplicationLoadBalancer.

[richardkeller411]

I’m using ALB but can’t seem to get response to return although I have the method firing and see it in the Post Method overloads that I have logging. The APIGateway message is part of the SDK logging from the ALB method

[bsthomsen]

@richardkeller411 you need to update your LambdaEntryPoint to reflect the other class I posted, I've added it to the gist so you can see how I did it:
https://gist.github.com/bsthomsen/f6397b1e171b91387c2a65bfb05169c5#file-lambdaentrypoint-cs

[richardkeller411]

I did that already.

[richardkeller411]

For anyone else looking at ALB... You need to make sure security groups account for HTTP Traffic Inbound and if you method connects to a Database or External HTTP call you need to have your VPC setup right with NAT Gateway and DB Internal Ports.