feat: add getting visitor counter

internal/handler/visitor.go

@@ -0,0 +1,18 @@
+package handler
+
+import (
+	"backend/internal/service"
+	"encoding/json"
+	"net/http"
+)
+
+func HandleGetVisitorCounter(w http.ResponseWriter, r *http.Request) {
+	data := service.GetVisitorCounter()
+
+	w.Header().Set("Content-Type", "application/json")
+	json.NewEncoder(w).Encode(data)
+}
+
+func HandlePatchVisitorCounter(w http.ResponseWriter, r *http.Request) {
+	w.Write([]byte("hello world"))
+}

internal/model/visitor.go

@@ -0,0 +1,5 @@
+package model
+
+type VisitorCounter struct {
+	Counter uint32 `json:"counter"`
+}

internal/server/router.go

@@ -8,6 +8,8 @@ import (
 
 	"github.com/go-chi/chi/v5"
 	"github.com/go-chi/chi/v5/middleware"
+
+	"backend/internal/handler"
 )
 
 func NewRouter() {
@@ -24,6 +26,9 @@ func NewRouter() {
 		http.Redirect(w, r, "https://axolotlmaid.com", http.StatusPermanentRedirect)
 	})
 
+	r.Get("/visitor-counter", handler.HandleGetVisitorCounter)
+	r.Patch("/visitor-counter", handler.HandlePatchVisitorCounter)
+
 	slog.Info("Starting server", slog.Any("port", os.Getenv("PORT")))
 	http.ListenAndServe(":"+os.Getenv("PORT"), r)
 }

internal/service/visitor.go

@@ -0,0 +1,30 @@
+package service
+
+import (
+	"encoding/json"
+	"io"
+	"log/slog"
+	"os"
+	"path/filepath"
+
+	"backend/internal/model"
+)
+
+func GetVisitorCounter() model.VisitorCounter {
+	path := filepath.Join(".", "data", "visitor.json")
+	jsonFile, err := os.Open(path)
+	if err != nil {
+		slog.Warn("File not found!", slog.Any("file", path))
+		return model.VisitorCounter{}
+	}
+
+	bytes, _ := io.ReadAll(jsonFile)
+
+	var data model.VisitorCounter
+	err = json.Unmarshal(bytes, &data)
+	if err != nil {
+		slog.Error("Error unmarshalling JSON", slog.Any("error", err), slog.Any("file", path))
+	}
+
+	return data
+}