main.go

package main

import (
	"context"
	"log"

	env "github.com/caarlos0/env/v10"

	"github.com/aws/aws-lambda-go/events"
	"github.com/aws/aws-lambda-go/lambda"
	ginadapter "github.com/awslabs/aws-lambda-go-api-proxy/gin"
	"github.com/gin-gonic/gin"
)

type config struct {
	SAMPLE_ENV string `env:"SAMPLE_ENV"`
}

var ginLambda *ginadapter.GinLambda

func init() {
	// stdout and stderr are sent to AWS CloudWatch Logs
	log.Printf("Gin cold start")

	cfg := config{}
	if err := env.Parse(&cfg); err != nil {
		log.Fatalf("%+v\n", err)
	}
	r := gin.Default()
	r.GET("/ping", func(ctx *gin.Context) {
		ctx.JSON(200, gin.H{
			"message": "pong",
		})
	})
	r.GET("/hello", func(ctx *gin.Context) {
		ctx.JSON(200, gin.H{
			"message": "world",
		})
	})

	ginLambda = ginadapter.New(r)
}

func Handler(ctx context.Context, req events.APIGatewayProxyRequest) (events.APIGatewayProxyResponse, error) {
	return ginLambda.ProxyWithContext(ctx, req)
}

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