main.go

package main

import (
	"context"
	"fmt"
	"log"
	"time"

	"github.com/aws/aws-lambda-go/lambda"
	"github.com/aws/aws-lambda-go/lambdacontext"
)

type Request struct {
	Body string `json:"body"`
}

type Response struct {
	Body string    `json:"body"`
	Time time.Time `json:"time"`
}

type ErrorResponse struct {
	Message string    `json:"message"`
	Time    time.Time `json:"time"`
}

func (er *ErrorResponse) Error() string {
	return fmt.Sprintf("error:%s at:%s", er.Message, er.Time.String())
}

func main() {
	lambda.Start(EchoHandler)

}

func EchoHandler(ctx context.Context, req *Request) (*Response, error) {
	lctx, ok := lambdacontext.FromContext(ctx)
	if !ok {
		return nil, &ErrorResponse{
			Message: "FromContextError",
			Time:    time.Now(),
		}
	}
	log.Printf("lambda ctx info:%+v", lctx)

	return &Response{
		Body: req.Body,
		Time: time.Now(),
	}, nil
}