feat: backend core - auth, user, role, permission, device, webhook, monitoring, cache, repository, service, middleware, API handlers

internal/service/classified_error.go

@@ -0,0 +1,41 @@
+package service
+
+import "errors"
+
+var (
+	ErrRateLimitExceeded = errors.New("rate limit exceeded")
+	ErrValidationFailed  = errors.New("validation failed")
+)
+
+type classifiedError struct {
+	message string
+	cause   error
+}
+
+func (e *classifiedError) Error() string {
+	if e.message != "" {
+		return e.message
+	}
+	if e.cause != nil {
+		return e.cause.Error()
+	}
+	return ""
+}
+
+func (e *classifiedError) Unwrap() error {
+	return e.cause
+}
+
+func newRateLimitError(message string) error {
+	return &classifiedError{
+		message: message,
+		cause:   ErrRateLimitExceeded,
+	}
+}
+
+func newValidationError(message string) error {
+	return &classifiedError{
+		message: message,
+		cause:   ErrValidationFailed,
+	}
+}