Refactor reloading by introducing a struct for it

It can load and update itself, which both encapsulates the logic and the
updating, which improves the usages and clarity of the program.

go/fake-http/fake-http.go

@@ -38,7 +38,10 @@ func init() {
	flag.BoolVar(&flags.proxyMinikube, "proxy-minikube", false, "Shortcut for -proxy-url https://$(minikube ip):8443 -proxy-client-cert ~/.minikube/client.crt -proxy-client-key ~/.minikube/client.key")
}
var responses = []Response{}
var responses Responses
// Responses is a list of responses that will be stubbed/faked.
type Responses []Response
func main() {
	flag.Parse()
@@ -58,7 +61,7 @@ func main() {
	requestLog := make([]LogEntry, 0)
	http.HandleFunc("/", func(w http.ResponseWriter, req *http.Request) {
		responses = loadResponses(flag.Arg(0), false, responses)
		responses.Load(responsesPath)
		var resp *http.Response
		if flags.proxyURL != "" {
@@ -114,15 +117,6 @@ func main() {
		}
	})
	http.HandleFunc("/_stubs", func(w http.ResponseWriter, req *http.Request) {
		responses = loadResponses(responsesPath, false, responses)
		err := renderYAML(w, responses)
		if err != nil {
			log.Printf("Error: Rendering stubs: %s", err)
		}
	})
	http.HandleFunc("/_help", func(w http.ResponseWriter, req *http.Request) {
		urls := []struct {
			URL     string
@@ -359,18 +353,16 @@ func readResponse(form url.Values) Response {
	return r
}
func loadResponses(path string, abort bool, prevResponses []Response) []Response {
	rs, err := loadResponsesRaw(path)
// Load loads responses from the YAML file at path.
func (rs *Responses) Load(path string) {
	responses, err := rs.loadFile(path)
	if err != nil {
		if abort {
			log.Fatalf("Error: Parsing %s: %s", flag.Arg(0), err)
		}
		return prevResponses
		log.Printf("Error: Parsing %s: %s", path, err)
	}
	return rs
	*rs = responses
}
func loadResponsesRaw(path string) ([]Response, error) {
func (rs *Responses) loadFile(path string) ([]Response, error) {
	out, err := ioutil.ReadFile(path)
	if err != nil {
		return nil, err