How do I detect warmup calls in a Go AWS Lambda function using the serverless WarmUp plugin?

Question content

I am using the Serverless WarmUp plugin to keep my Go AWS Lambda functions warm. I need to detect when a plugin calls a Lambda function so I can return a specific response. How to correctly detect warmup calls in Go code?

Correct answer

You can detect warmup calls in go aws lambda functions by checking the client context, this can be done using the lambdacontext in the go sdk of aws lambda package to complete. The code snippet below shows how to do this:

package main

import (
    "context"
    "github.com/aws/aws-lambda-go/events"
    "github.com/aws/aws-lambda-go/lambda"
    "github.com/aws/aws-lambda-go/lambdacontext"
)

func HandleRequest(ctx context.Context, request events.APIGatewayProxyRequest) (events.APIGatewayProxyResponse, error) {
    lc, _ := lambdacontext.FromContext(ctx)
    if lc.ClientContext.Custom["source"] == "serverless-plugin-warmup" {
        return events.APIGatewayProxyResponse{Body: "Lambda is warm!", StatusCode: 200}, nil
    }

    // ... other function logic ...

    // Default response for demonstration
    return events.APIGatewayProxyResponse{
        StatusCode: 200,
        Body:       "Hello from Go Lambda!",
    }, nil
}

func main() {
    lambda.Start(HandleRequest)
}

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