Initializing db connections, loggers etc in a go serverless function

go_serverless.go

var (
	db         *sql.DB
	logger     *logging.Logger
	once       sync.Once
)


// This pattern is used to make the init function easily replaceable in tests
var initFunc = defaultInitFunc

func F(w http.ResponseWriter, r *http.Request) {
	once.Do(func() {
		// This will make sure that the initFunc will only run once after a teardown
		if err := initFunc(); err != nil {
			panic(err)
		}
	})

  // Function logic goes here
}

func defaultInitFunc() error {
	//Do the initializations like connecting to the db, initializing logger here
}