Переработана структура приложения

app.go

@@ -0,0 +1,36 @@
+package main
+
+import (
+	"html/template"
+	"log"
+	"net/http"
+)
+
+type App struct {
+	store TxtStore
+}
+
+func (a *App) mainPageHandler(writer http.ResponseWriter, request *http.Request) {
+	html, err := template.ParseFS(staticFiles, "static/index.html")
+	if err != nil {
+		log.Fatal(err)
+	}
+
+	guestbook, err := a.store.GetGuestbook()
+	if err != nil {
+		log.Fatal(err)
+	}
+
+	if err := html.Execute(writer, guestbook); err != nil {
+		log.Fatal(err)
+	}
+}
+
+func (a *App) newCommentHandler(writer http.ResponseWriter, request *http.Request) {
+	comment := request.FormValue("comment")
+	if err := a.store.AddComment(comment); err != nil {
+		log.Fatal(err)
+	}
+
+	http.Redirect(writer, request, "/", http.StatusFound)
+}

main.go

@@ -2,7 +2,6 @@ package main
 
 import (
 	"embed"
-	"html/template"
 	"log"
 	"net/http"
 )
@@ -15,41 +14,15 @@ type Guestbook struct {
 	Count    int
 }
 
-func indexHandler(writer http.ResponseWriter, request *http.Request) {
-	html, err := template.ParseFS(staticFiles, "static/index.html")
-	check(err)
-
-	store := TxtStore("comments.txt")
-	guestbook, err := store.GetGuestbook()
-	check(err)
-
-	err = html.Execute(writer, guestbook)
-	check(err)
-}
-
-func newHandler(writer http.ResponseWriter, request *http.Request) {
-	comment := request.FormValue("comment")
-	store := TxtStore("comments.txt")
-
-	err := store.AddComment(comment)
-	check(err)
-
-	http.Redirect(writer, request, "/", http.StatusFound)
-}
-
 func main() {
-	http.HandleFunc("/", indexHandler)
-	http.HandleFunc("/new", newHandler)
+	app := App{store: TxtStore("comments.txt")}
+
+	http.HandleFunc("/", app.mainPageHandler)
+	http.HandleFunc("/new", app.newCommentHandler)
 
 	var staticFS = http.FS(staticFiles)
 	http.Handle("/static/", http.FileServer(staticFS))
 
-	err := http.ListenAndServe("0.0.0.0:80", nil)
+	err := http.ListenAndServe(":80", nil)
 	log.Fatal(err)
 }
-
-func check(err error) {
-	if err != nil {
-		log.Fatal(err)
-	}
-}