static void
e_book_backend_webdav_get_contact (EBookBackend *backend,
                                   EDataBook *book,
                                   guint32 opid,
                                   GCancellable *cancellable,
                                   const gchar *uid)
{
	EBookBackendWebdav        *webdav = E_BOOK_BACKEND_WEBDAV (backend);
	EBookBackendWebdavPrivate *priv   = webdav->priv;
	EContact                  *contact;
	gchar                      *vcard;

	if (!e_backend_get_online (E_BACKEND (backend))) {
		g_mutex_lock (&priv->cache_lock);
		contact = e_book_backend_cache_get_contact (priv->cache, uid);
		g_mutex_unlock (&priv->cache_lock);
	} else {
		contact = download_contact (webdav, uid, cancellable);
		/* update cache as we possibly have changes */
		if (contact != NULL) {
			g_mutex_lock (&priv->cache_lock);
			e_book_backend_cache_remove_contact (priv->cache, uid);
			e_book_backend_cache_add_contact (priv->cache, contact);
			g_mutex_unlock (&priv->cache_lock);
		}
	}

	if (contact == NULL) {
		e_data_book_respond_get_contact (book, opid, EDB_ERROR (CONTACT_NOT_FOUND), NULL);
		return;
	}

	vcard = e_vcard_to_string (E_VCARD (contact), EVC_FORMAT_VCARD_30);
	e_data_book_respond_get_contact (book, opid, EDB_ERROR (SUCCESS), vcard);
	g_free (vcard);
	g_object_unref (contact);
}
static void
_e_book_backend_get_contact (EBookBackend *backend,
			     EDataBook    *book,
			     guint32       opid,
			     const gchar   *id)
{
	GError *error = NULL;
	gchar *vcard = NULL;

	e_book_backend_sync_get_contact (E_BOOK_BACKEND_SYNC (backend), book, opid, id, &vcard, &error);

	e_data_book_respond_get_contact (book, opid, error, vcard);

	if (vcard)
		g_free (vcard);
}