调用AWS Lambda时使用Handler函数和Invoke函数是否有所不同

Is there a difference when using Handler function to invoke AWS Lambda, and when using Invoke(input *InvokeInput) function in Go?

I need my Lambda to be invoked in multiple ways. For example, sometimes I need it to be invoked synchronously (as REST API) and sometimes I need it to be invoked asynchronously. How do I achieve this?

Do I create something like this:

func main(){

svc := lambda.New(session.New())
input := &lambda.InvokeInput{
    ClientContext:  aws.String("MyApp"),
    FunctionName:   aws.String("MyFunction"),
    InvocationType: aws.String("Event"),
    LogType:        aws.String("Tail"),
    Payload:        []byte("fileb://file-path/input.json"),
    Qualifier:      aws.String("1"),
}

result, err := svc.Invoke(input)
if err != nil {
 ....
}

}

Or do I create a Handler function like this:

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

func Handler(ctx context.Context, request events.APIGatewayProxyRequest) (events.APIGatewayProxyResponse, error){
   ....
}

How do I handle both cases where sometimes I need to invoke lambda asynchronously and provide input payload as JSON, and sometimes I need to invoke lambda synchronously (REST API) and provide input as HTTP Request? Is there a way to Invoke lambda as a REST API without passing events.APIGatewayProxyRequest as an function argument?