Getting requester's IP address in AWS lambda function - amazon-web-services

Question

I understand, from the answer to this question, that I can get the IP address of the caller of a node.js lambda function by doing this:
events['headers']['X-Forwarded-For']
It seems like, for Go, this information should be inside the context.Context for lambda signatures that take it. However, looking at the documentation, I don't see any mention of request headers. Is there a way to get the same information in a Go lambda function?

Answer 1

After doing some research on my own, I figured out that I needed to put my lambda function behind an API Gateway instance to get the information I was interested in. After doing that, I could modify the handler like this:
package main
import (
"github.com/aws/aws-lambda-go/events"
"github.com/aws/aws-lambda-go/lambda"
)
func LambdaHandler(ctx context.Context, request events.APIGatewayV2HTTPRequest) (int, error) {
// some code
addr := request.RequestContext.HTTP.SourceIP
// some other code
return 0
}
func main() {
lambda.Start(LambdaHandler)
}
By doing this, the API gateway will populate all the request metadata I need and pass that on to my lambda function. The request body is now contained in request.Body so I can extract that data using JSON deserialization or whatever other method my data is encoded as.