Added OpenTelemetry and use structured logging

internal/api/response/json.go

@@ -1,19 +1,20 @@
 package response
 
 import (
+	"context"
 	"encoding/json"
-	"log"
+	"log/slog"
 	"net/http"
 )
 
-func JSON(w http.ResponseWriter, status int, data any) {
+func JSON(ctx context.Context, w http.ResponseWriter, status int, data any) {
 	payload, err := json.Marshal(data)
 	if err != nil {
 		w.Header().Set("Content-Type", "application/json")
 		w.WriteHeader(http.StatusInternalServerError)
 		_, err := w.Write([]byte(`{"error": "internal server error: failed to marshal response"}`))
 		if err != nil {
-			log.Println(err)
+			slog.ErrorContext(ctx, "Failed to write JSON", slog.Any("error", err))
 			return
 		}
 		return
@@ -23,11 +24,11 @@ func JSON(w http.ResponseWriter, status int, data any) {
 	w.WriteHeader(status)
 	_, err = w.Write(payload)
 	if err != nil {
-		log.Println(err)
+		slog.ErrorContext(ctx, "Failed to write response", slog.Any("error", err))
 		return
 	}
 }
 
-func Error(w http.ResponseWriter, status int, message string) {
-	JSON(w, status, map[string]string{"error": message})
+func Error(ctx context.Context, w http.ResponseWriter, status int, message string) {
+	JSON(ctx, w, status, map[string]string{"error": message})
 }