Explain to me please what is the best way to locally test the lambda function. I used sam local and this solution https://github.com/lambci/docker-lambda
for testing, but for example, where I invoke one lambda from another error occurs. In general, I can't make stubs for methods since lambda runs in a container
There are a couple of options. Following two are some popular ones.
This is how I test local lambda functions without Serverless frameworks, I run an HTTP post on local (quite easy setup for Go)
func HandleRequest(ctx context.Context, request events.APIGatewayProxyRequest) (events.APIGatewayProxyResponse, error) {
_, _ = pretty.Println("parsed:", request.Body)
return events.APIGatewayProxyResponse{Body: "response is working", StatusCode: 200}, nil
}
func main() {
environment := loadEnv()
if environment == "develop" {
router.NewRouter()
select {}
} else {
lambda.Start(lambdahandler.HandleRequest)
}
}
func MapToApiGateway(w http.ResponseWriter, r *http.Request) (interface{}, error) {
request := new(EmailResponderRequest)
if err := json.NewDecoder(r.Body).Decode(request); err != nil {
return err.Error(), err
}
apiGatewayRequest := mapHttpRequestToGatewayRequest(*request)
events, err := lambdahandler.HandleRequest(nil, apiGatewayRequest)
if err != nil {
return err.Error(), err
}
return events, nil
}
For local manual testing (not unit testing) with sam cli
you can specify the environment varilables file with the -n, --env-vars PATH
option and use your real resource identifiers like you would normally do within your Cloud Formation template (refer to the official documentation for more informations).
This should let you invoke other functions directly and use a real DynamoDB table and all other AWS Cloud resources.
Note: if you use VSCode you can try this helper extension .
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