feat: add the /reset endpoint, makes getenv generic, limit scope of l

main.go

@@ -13,10 +13,7 @@ import (
 	"github.com/gorilla/mux"
 )
 
-var (
+var C counter
-	l int
-	C counter
-)
 
 type counter struct {
 	mu sync.Mutex
@@ -42,26 +39,35 @@ func (c *counter) Reset() {
 	c.mu.Unlock()
 }
 
-func getenv(k string, d int) int {
+func getenv[D ~string | int](k string, d D) D {
 	v := os.Getenv(k)
 	if len(v) == 0 {
 		return d
 	}
+	var r any
+	switch any(d).(type) {
+	case string:
+		r = v
+	case int:
 		i, err := strconv.Atoi(v)
 		if err != nil {
-		log.Fatalf("Invalid Value, %s not a valid integer: %v", k, err)
 		}
-	return i
+		r = i
+	default:
+		log.Fatalf("Invalid Value, %s not a valid", k)
+	}
+	return r.(D)
 }
 
-func serve() bool {
+func serve(l int) bool {
 	return C.Get() < l
 }
 
-func handler(w http.ResponseWriter, r *http.Request) {
+func handler(l int) http.HandlerFunc {
+	return func(w http.ResponseWriter, r *http.Request) {
 		r.ParseForm()
 		jm, err := json.Marshal(r.PostForm)
-	if err != nil || !serve() {
+		if err != nil || !serve(l) {
 			w.WriteHeader(http.StatusInternalServerError)
 			fmt.Fprintln(w, "why did you do that?")
 			C.Add()
@@ -69,11 +75,12 @@ func handler(w http.ResponseWriter, r *http.Request) {
 		}
 		fmt.Fprintf(w, "%v", string(jm))
 		C.Add()
+	}
 }
 
-func httpHealth() http.HandlerFunc {
+func httpHealth(l int) http.HandlerFunc {
 	return func(w http.ResponseWriter, r *http.Request) {
-		if !serve() {
+		if !serve(l) {
 			w.WriteHeader(http.StatusInternalServerError)
 			fmt.Fprintf(w, `{"status":"FAIL","requests":"%v"}`, C.Get())
 			return
@@ -82,13 +89,30 @@ func httpHealth() http.HandlerFunc {
 	}
 }
 
+func reset(rt string) http.HandlerFunc {
+	return func(w http.ResponseWriter, r *http.Request) {
+		r.ParseForm()
+		t := r.FormValue("TOKEN")
+		if len(t) == 0 || t != rt {
+			w.WriteHeader(http.StatusBadRequest)
+			fmt.Fprintf(w, "Bad request, invalid token")
+			return
+		}
+		C.Reset()
+		fmt.Fprintf(w, `{"status":"ok","requests":"%v"}`, C.Get())
+	}
+}
+
 func main() {
-	l = getenv("MAX_REQUESTS", 500)
+	l := getenv("MAX_REQUESTS", 500)
+	t := getenv("TOKEN", "token")
 	r := mux.NewRouter()
-	r.HandleFunc("/", handler).
+	r.HandleFunc("/", handler(l)).
 		Methods("POST")
-	r.HandleFunc("/healthz", httpHealth()).
+	r.HandleFunc("/healthz", httpHealth(l)).
 		Methods("GET")
+	r.HandleFunc("/reset", reset(t)).
+		Methods("PUT")
 	logger := handlers.LoggingHandler(os.Stdout, r)
 	log.Fatal(http.ListenAndServe(":8080", logger))
 }