efl/src/lib/eldbus/eldbus_object.c

#include "eldbus_private.h"
#include "eldbus_private_types.h"
#include <dbus/dbus.h>

/* TODO: mempool of Eldbus_Object, Eldbus_Object_Context_Event_Cb and
 * Eldbus_Object_Context_Event
 */

#define ELDBUS_OBJECT_CHECK(obj)                        \
  do                                                   \
    {                                                  \
       EINA_SAFETY_ON_NULL_RETURN(obj);                \
       if (!EINA_MAGIC_CHECK(obj, ELDBUS_OBJECT_MAGIC)) \
         {                                             \
            EINA_MAGIC_FAIL(obj, ELDBUS_OBJECT_MAGIC);  \
            return;                                    \
         }                                             \
       EINA_SAFETY_ON_TRUE_RETURN(obj->refcount <= 0); \
    }                                                  \
  while (0)

#define ELDBUS_OBJECT_CHECK_RETVAL(obj, retval)                     \
  do                                                               \
    {                                                              \
       EINA_SAFETY_ON_NULL_RETURN_VAL(obj, retval);                \
       if (!EINA_MAGIC_CHECK(obj, ELDBUS_OBJECT_MAGIC))             \
         {                                                         \
            EINA_MAGIC_FAIL(obj, ELDBUS_OBJECT_MAGIC);              \
            return retval;                                         \
         }                                                         \
       EINA_SAFETY_ON_TRUE_RETURN_VAL(obj->refcount <= 0, retval); \
    }                                                              \
  while (0)

#define ELDBUS_OBJECT_CHECK_GOTO(obj, label)                 \
  do                                                        \
    {                                                       \
       EINA_SAFETY_ON_NULL_GOTO(obj, label);                \
       if (!EINA_MAGIC_CHECK(obj, ELDBUS_OBJECT_MAGIC))      \
         {                                                  \
            EINA_MAGIC_FAIL(obj, ELDBUS_OBJECT_MAGIC);       \
            goto label;                                     \
         }                                                  \
       EINA_SAFETY_ON_TRUE_GOTO(obj->refcount <= 0, label); \
    }                                                       \
  while (0)

Eina_Bool
eldbus_object_init(void)
{
   return EINA_TRUE;
}

void
eldbus_object_shutdown(void)
{
}

static void _eldbus_object_event_callback_call(Eldbus_Object *obj, Eldbus_Object_Event_Type type, const void *event_info);
static void _eldbus_object_context_event_cb_del(Eldbus_Object_Context_Event *ce, Eldbus_Object_Context_Event_Cb *ctx);
static void _on_connection_free(void *data, const void *dead_pointer);
static void _on_signal_handler_free(void *data, const void *dead_pointer);

static void
_eldbus_object_call_del(Eldbus_Object *obj)
{
   Eldbus_Object_Context_Event *ce;

   _eldbus_object_event_callback_call(obj, ELDBUS_OBJECT_EVENT_DEL, NULL);

   /* clear all del callbacks so we don't call them twice at
    * _eldbus_object_clear()
    */
   ce = obj->event_handlers + ELDBUS_OBJECT_EVENT_DEL;
   while (ce->list)
     {
        Eldbus_Object_Context_Event_Cb *ctx;

        ctx = EINA_INLIST_CONTAINER_GET(ce->list,
                                        Eldbus_Object_Context_Event_Cb);
        _eldbus_object_context_event_cb_del(ce, ctx);
     }
}

static void
_eldbus_object_clear(Eldbus_Object *obj)
{
   Eldbus_Signal_Handler *h;
   Eldbus_Pending *p;
   Eina_List *iter, *iter_next;
   Eina_Inlist *in_l;
   DBG("obj=%p, refcount=%d, name=%s, path=%s",
       obj, obj->refcount, obj->name, obj->path);

   obj->refcount = 1;
   _eldbus_object_call_del(obj);
   eldbus_connection_name_object_del(obj->conn, obj);

   /* NOTE: obj->proxies is deleted from obj->cbs_free. */

   EINA_LIST_FOREACH_SAFE(obj->signal_handlers, iter, iter_next, h)
     {
        DBG("obj=%p delete owned signal handler %p %s",
            obj, h, eldbus_signal_handler_match_get(h));
        eldbus_signal_handler_del(h);
     }
   EINA_INLIST_FOREACH_SAFE(obj->pendings, in_l, p)
     {
        DBG("obj=%p delete owned pending call=%p dest=%s path=%s %s.%s()",
            obj, p,
            eldbus_pending_destination_get(p),
            eldbus_pending_path_get(p),
            eldbus_pending_interface_get(p),
            eldbus_pending_method_get(p));
        eldbus_pending_cancel(p);
     }

   eldbus_cbs_free_dispatch(&(obj->cbs_free), obj);
   obj->refcount = 0;
}

static void
_eldbus_object_free(Eldbus_Object *obj)
{
   unsigned int i;
   Eldbus_Signal_Handler *h;

   if (obj->proxies)
     {
        Eina_Iterator *iterator = eina_hash_iterator_data_new(obj->proxies);
        Eldbus_Proxy *proxy;
        EINA_ITERATOR_FOREACH(iterator, proxy)
          ERR("obj=%p alive proxy=%p %s", obj, proxy,
              eldbus_proxy_interface_get(proxy));
        eina_iterator_free(iterator);
        eina_hash_free(obj->proxies);
     }

   EINA_LIST_FREE(obj->signal_handlers, h)
     {
        if (h->dangling)
          eldbus_signal_handler_free_cb_del(h, _on_signal_handler_free, obj);
        else
          ERR("obj=%p alive handler=%p %s", obj, h,
              eldbus_signal_handler_match_get(h));
     }

   if (obj->pendings)
     CRI("Object %p released with live pending calls!", obj);

   for (i = 0; i < ELDBUS_OBJECT_EVENT_LAST; i++)
     {
        Eldbus_Object_Context_Event *ce = obj->event_handlers + i;
        while (ce->list)
          {
             Eldbus_Object_Context_Event_Cb *ctx;

             ctx = EINA_INLIST_CONTAINER_GET(ce->list,
                                             Eldbus_Object_Context_Event_Cb);
             _eldbus_object_context_event_cb_del(ce, ctx);
          }
        eina_list_free(ce->to_delete);
     }

   if (obj->interfaces_added)
     eldbus_signal_handler_del(obj->interfaces_added);
   if (obj->interfaces_removed)
     eldbus_signal_handler_del(obj->interfaces_removed);
   if (obj->properties_changed)
     eldbus_signal_handler_del(obj->properties_changed);
   eina_stringshare_del(obj->name);
   eina_stringshare_del(obj->path);
   EINA_MAGIC_SET(obj, EINA_MAGIC_NONE);

   free(obj);
}

static void
_on_connection_free(void *data, const void *dead_pointer EINA_UNUSED)
{
   Eldbus_Object *obj = data;
   ELDBUS_OBJECT_CHECK(obj);
   _eldbus_object_clear(obj);
   _eldbus_object_free(obj);
}

EAPI Eldbus_Object *
eldbus_object_get(Eldbus_Connection *conn, const char *bus, const char *path)
{
   Eldbus_Object *obj;

   EINA_SAFETY_ON_NULL_RETURN_VAL(conn, NULL);
   EINA_SAFETY_ON_NULL_RETURN_VAL(bus, NULL);
   EINA_SAFETY_ON_NULL_RETURN_VAL(path, NULL);

   obj = eldbus_connection_name_object_get(conn, bus, path);
   if (obj)
     return eldbus_object_ref(obj);

   obj = calloc(1, sizeof(Eldbus_Object));
   EINA_SAFETY_ON_NULL_RETURN_VAL(obj, NULL);

   obj->conn = conn;
   obj->refcount = 1;
   obj->path = eina_stringshare_add(path);
   obj->name = eina_stringshare_add(bus);
   obj->proxies = eina_hash_string_small_new(NULL);
   EINA_SAFETY_ON_NULL_GOTO(obj->proxies, cleanup);
   EINA_MAGIC_SET(obj, ELDBUS_OBJECT_MAGIC);

   eldbus_connection_name_object_set(conn, obj);
   eldbus_connection_free_cb_add(obj->conn, _on_connection_free, obj);

   obj->properties = eldbus_proxy_get(obj, ELDBUS_FDO_INTERFACE_PROPERTIES);

   return obj;

cleanup:
   eina_stringshare_del(obj->path);
   eina_stringshare_del(obj->name);
   free(obj);

   return NULL;
}

static void _on_signal_handler_free(void *data, const void *dead_pointer);

static void
_eldbus_object_unref(Eldbus_Object *obj)
{
   obj->refcount--;
   if (obj->refcount > 0) return;

   eldbus_connection_free_cb_del(obj->conn, _on_connection_free, obj);
   _eldbus_object_clear(obj);
   _eldbus_object_free(obj);
}

EAPI Eldbus_Object *
eldbus_object_ref(Eldbus_Object *obj)
{
   ELDBUS_OBJECT_CHECK_RETVAL(obj, NULL);
   DBG("obj=%p, pre-refcount=%d, name=%s, path=%s",
       obj, obj->refcount, obj->name, obj->path);
   obj->refcount++;
   return obj;
}

EAPI void
eldbus_object_unref(Eldbus_Object *obj)
{
   ELDBUS_OBJECT_CHECK(obj);
   DBG("obj=%p, pre-refcount=%d, name=%s, path=%s",
       obj, obj->refcount, obj->name, obj->path);
   _eldbus_object_unref(obj);
}

EAPI void
eldbus_object_free_cb_add(Eldbus_Object *obj, Eldbus_Free_Cb cb, const void *data)
{
   ELDBUS_OBJECT_CHECK(obj);
   EINA_SAFETY_ON_NULL_RETURN(cb);
   obj->cbs_free = eldbus_cbs_free_add(obj->cbs_free, cb, data);
}

EAPI void
eldbus_object_free_cb_del(Eldbus_Object *obj, Eldbus_Free_Cb cb, const void *data)
{
   ELDBUS_OBJECT_CHECK(obj);
   EINA_SAFETY_ON_NULL_RETURN(cb);
   obj->cbs_free = eldbus_cbs_free_del(obj->cbs_free, cb, data);
}

static void
_cb_interfaces_added(void *data, const Eldbus_Message *msg)
{
   Eldbus_Object *obj = data;
   const char *obj_path;
   Eldbus_Message_Iter *array_ifaces, *entry_iface;

   if (!eldbus_message_arguments_get(msg, "oa{sa{sv}}", &obj_path, &array_ifaces))
     return;

   while (eldbus_message_iter_get_and_next(array_ifaces, 'e', &entry_iface))
     {
        const char *iface_name;
        Eldbus_Object_Event_Interface_Added event;

        eldbus_message_iter_basic_get(entry_iface, &iface_name);
        event.proxy = eldbus_proxy_get(obj, iface_name);
        EINA_SAFETY_ON_NULL_RETURN(event.proxy);
        event.interface = iface_name;
        _eldbus_object_event_callback_call(obj, ELDBUS_OBJECT_EVENT_IFACE_ADDED,
                                          &event);
        eldbus_proxy_unref(event.proxy);
     }
}

static void
_cb_interfaces_removed(void *data, const Eldbus_Message *msg)
{
   Eldbus_Object *obj = data;
   const char *obj_path, *iface;
   Eldbus_Message_Iter *array_ifaces;

   if (!eldbus_message_arguments_get(msg, "oas", &obj_path, &array_ifaces))
     return;

   while (eldbus_message_iter_get_and_next(array_ifaces, 's', &iface))
     {
        Eldbus_Object_Event_Interface_Removed event;
        event.interface = iface;
        _eldbus_object_event_callback_call(obj, ELDBUS_OBJECT_EVENT_IFACE_REMOVED,
                                          &event);
     }
}

static void
_property_changed_iter(void *data, const void *key, Eldbus_Message_Iter *var)
{
   Eldbus_Proxy *proxy = data;
   const char *skey = key;
   Eina_Value *st_value, stack_value;
   Eldbus_Object_Event_Property_Changed event;

   st_value = _message_iter_struct_to_eina_value(var);
   eina_value_struct_value_get(st_value, "arg0", &stack_value);

   event.interface = eldbus_proxy_interface_get(proxy);
   event.proxy = proxy;
   event.name = skey;
   event.value = &stack_value;
   _eldbus_object_event_callback_call(eldbus_proxy_object_get(proxy),
                                     ELDBUS_OBJECT_EVENT_PROPERTY_CHANGED,
                                     &event);
   eina_value_free(st_value);
   eina_value_flush(&stack_value);
}

static void
_cb_properties_changed(void *data, const Eldbus_Message *msg)
{
   Eldbus_Object *obj = data;
   Eldbus_Proxy *proxy;
   Eldbus_Message_Iter *array, *invalidate;
   const char *iface;
   const char *invalidate_prop;

   if (!eldbus_message_arguments_get(msg, "sa{sv}as", &iface, &array, &invalidate))
     {
        ERR("Error getting data from properties changed signal.");
        return;
     }

   proxy = eldbus_proxy_get(obj, iface);
   EINA_SAFETY_ON_NULL_RETURN(proxy);

   if (obj->event_handlers[ELDBUS_OBJECT_EVENT_PROPERTY_CHANGED].list)
     eldbus_message_iter_dict_iterate(array, "sv", _property_changed_iter,
                                     proxy);

   if (!obj->event_handlers[ELDBUS_OBJECT_EVENT_PROPERTY_REMOVED].list)
     goto end;

   while (eldbus_message_iter_get_and_next(invalidate, 's', &invalidate_prop))
     {
        Eldbus_Object_Event_Property_Removed event;
        event.interface = iface;
        event.name = invalidate_prop;
        event.proxy = proxy;
        _eldbus_object_event_callback_call(obj,
                                          ELDBUS_OBJECT_EVENT_PROPERTY_REMOVED,
                                          &event);
     }
end:
   eldbus_proxy_unref(proxy);
}

EAPI void
eldbus_object_event_callback_add(Eldbus_Object *obj, Eldbus_Object_Event_Type type, Eldbus_Object_Event_Cb cb, const void *cb_data)
{
   Eldbus_Object_Context_Event *ce;
   Eldbus_Object_Context_Event_Cb *ctx;

   ELDBUS_OBJECT_CHECK(obj);
   EINA_SAFETY_ON_NULL_RETURN(cb);
   EINA_SAFETY_ON_TRUE_RETURN(type >= ELDBUS_OBJECT_EVENT_LAST);

   ce = obj->event_handlers + type;

   ctx = calloc(1, sizeof(Eldbus_Object_Context_Event_Cb));
   EINA_SAFETY_ON_NULL_RETURN(ctx);

   ctx->cb = cb;
   ctx->cb_data = cb_data;

   ce->list = eina_inlist_append(ce->list, EINA_INLIST_GET(ctx));

   switch (type)
     {
      case ELDBUS_OBJECT_EVENT_IFACE_ADDED:
         {
            if (obj->interfaces_added)
              break;
            obj->interfaces_added =
                     _eldbus_signal_handler_add(obj->conn, obj->name, NULL,
                                               ELDBUS_FDO_INTERFACE_OBJECT_MANAGER,
                                               "InterfacesAdded",
                                               _cb_interfaces_added, obj);
            EINA_SAFETY_ON_NULL_RETURN(obj->interfaces_added);
            eldbus_signal_handler_match_extra_set(obj->interfaces_added, "arg0",
                                                 obj->path, NULL);
            break;
         }
      case ELDBUS_OBJECT_EVENT_IFACE_REMOVED:
        {
           if (obj->interfaces_removed)
             break;
           obj->interfaces_removed =
                    _eldbus_signal_handler_add(obj->conn, obj->name, NULL,
                                              ELDBUS_FDO_INTERFACE_OBJECT_MANAGER,
                                              "InterfacesRemoved",
                                              _cb_interfaces_removed, obj);
           EINA_SAFETY_ON_NULL_RETURN(obj->interfaces_removed);
           eldbus_signal_handler_match_extra_set(obj->interfaces_removed,
                                                "arg0", obj->path, NULL);
           break;
        }
      case ELDBUS_OBJECT_EVENT_PROPERTY_CHANGED:
      case ELDBUS_OBJECT_EVENT_PROPERTY_REMOVED:
        {
           if (obj->properties_changed)
             break;
           obj->properties_changed =
                    eldbus_object_signal_handler_add(obj,
                                                    ELDBUS_FDO_INTERFACE_PROPERTIES,
                                                    "PropertiesChanged",
                                                    _cb_properties_changed, obj);
           EINA_SAFETY_ON_NULL_RETURN(obj->properties_changed);
           break;
        }
      default:
        break;
     }
}

static void
_eldbus_object_context_event_cb_del(Eldbus_Object_Context_Event *ce, Eldbus_Object_Context_Event_Cb *ctx)
{
   ce->list = eina_inlist_remove(ce->list, EINA_INLIST_GET(ctx));
   free(ctx);
}

EAPI void
eldbus_object_event_callback_del(Eldbus_Object *obj, Eldbus_Object_Event_Type type, Eldbus_Object_Event_Cb cb, const void *cb_data)
{
   Eldbus_Object_Context_Event *ce;
   Eldbus_Object_Context_Event_Cb *iter, *found = NULL;

   ELDBUS_OBJECT_CHECK(obj);
   EINA_SAFETY_ON_NULL_RETURN(cb);
   EINA_SAFETY_ON_TRUE_RETURN(type >= ELDBUS_OBJECT_EVENT_LAST);

   ce = obj->event_handlers + type;

   EINA_INLIST_FOREACH(ce->list, iter)
     {
        if (cb != iter->cb) continue;
        if ((cb_data) && (cb_data != iter->cb_data)) continue;

        found = iter;
        break;
     }

   EINA_SAFETY_ON_NULL_RETURN(found);
   EINA_SAFETY_ON_TRUE_RETURN(found->deleted);

   if (ce->walking)
     {
        found->deleted = EINA_TRUE;
        ce->to_delete = eina_list_append(ce->to_delete, found);
        return;
     }

   _eldbus_object_context_event_cb_del(ce, found);

   switch (type)
     {
      case ELDBUS_OBJECT_EVENT_IFACE_ADDED:
         {
            if (obj->event_handlers[ELDBUS_OBJECT_EVENT_IFACE_ADDED].list)
              break;
            eldbus_signal_handler_del(obj->interfaces_added);
            obj->interfaces_added = NULL;
            break;
         }
      case ELDBUS_OBJECT_EVENT_IFACE_REMOVED:
        {
           if (obj->event_handlers[ELDBUS_OBJECT_EVENT_IFACE_REMOVED].list)
             break;
           eldbus_signal_handler_del(obj->interfaces_removed);
           obj->interfaces_removed = NULL;
           break;
        }
      case ELDBUS_OBJECT_EVENT_PROPERTY_CHANGED:
      case ELDBUS_OBJECT_EVENT_PROPERTY_REMOVED:
        {
           if (obj->event_handlers[ELDBUS_OBJECT_EVENT_PROPERTY_CHANGED].list ||
               obj->event_handlers[ELDBUS_OBJECT_EVENT_PROPERTY_REMOVED].list)
             break;
           eldbus_signal_handler_del(obj->properties_changed);
           obj->properties_changed = NULL;
           break;
        }
      default:
        break;
     }
}

static void
_eldbus_object_event_callback_call(Eldbus_Object *obj, Eldbus_Object_Event_Type type, const void *event_info)
{
   Eldbus_Object_Context_Event *ce;
   Eldbus_Object_Context_Event_Cb *iter;

   ce = obj->event_handlers + type;

   ce->walking++;
   EINA_INLIST_FOREACH(ce->list, iter)
     {
        if (iter->deleted) continue;
        iter->cb((void *)iter->cb_data, obj, (void *)event_info);
     }
   ce->walking--;
   if (ce->walking > 0) return;

   EINA_LIST_FREE(ce->to_delete, iter)
     _eldbus_object_context_event_cb_del(ce, iter);
}

EAPI Eldbus_Connection *
eldbus_object_connection_get(const Eldbus_Object *obj)
{
   ELDBUS_OBJECT_CHECK_RETVAL(obj, NULL);
   return obj->conn;
}

EAPI const char *
eldbus_object_bus_name_get(const Eldbus_Object *obj)
{
   ELDBUS_OBJECT_CHECK_RETVAL(obj, NULL);
   return obj->name;
}

EAPI const char *
eldbus_object_path_get(const Eldbus_Object *obj)
{
   ELDBUS_OBJECT_CHECK_RETVAL(obj, NULL);
   return obj->path;
}

static void
_on_object_message_cb(void *data, const Eldbus_Message *msg, Eldbus_Pending *pending)
{
   Eldbus_Message_Cb cb = eldbus_pending_data_del(pending, "__user_cb");
   Eldbus_Object *obj = eldbus_pending_data_del(pending, "__object");

   ELDBUS_OBJECT_CHECK(obj);
   obj->pendings = eina_inlist_remove(obj->pendings, EINA_INLIST_GET(pending));

   cb(data, msg, pending);
}

EAPI Eldbus_Pending *
eldbus_object_send(Eldbus_Object *obj, Eldbus_Message *msg, Eldbus_Message_Cb cb, const void *cb_data, double timeout)
{
   Eldbus_Pending *pending;

   ELDBUS_OBJECT_CHECK_RETVAL(obj, NULL);
   EINA_SAFETY_ON_NULL_RETURN_VAL(msg, NULL);

   if (!cb)
     {
        _eldbus_connection_send(obj->conn, msg, NULL, NULL, timeout);
        return NULL;
     }
   pending = _eldbus_connection_send(obj->conn, msg, _on_object_message_cb,
                                     cb_data, timeout);
   EINA_SAFETY_ON_NULL_RETURN_VAL(pending, NULL);

   eldbus_pending_data_set(pending, "__user_cb", cb);
   eldbus_pending_data_set(pending, "__object", obj);
   obj->pendings = eina_inlist_append(obj->pendings, EINA_INLIST_GET(pending));

   return pending;
}

static void
_on_signal_handler_free(void *data, const void *dead_pointer)
{
   Eldbus_Object *obj = data;
   ELDBUS_OBJECT_CHECK(obj);
   obj->signal_handlers = eina_list_remove(obj->signal_handlers, dead_pointer);
}

EAPI Eldbus_Signal_Handler *
eldbus_object_signal_handler_add(Eldbus_Object *obj, const char *interface, const char *member, Eldbus_Signal_Cb cb, const void *cb_data)
{
   Eldbus_Signal_Handler *handler;

   ELDBUS_OBJECT_CHECK_RETVAL(obj, NULL);
   EINA_SAFETY_ON_NULL_RETURN_VAL(cb, NULL);

   handler = _eldbus_signal_handler_add(obj->conn, obj->name, obj->path,
                                       interface, member, cb, cb_data);
   EINA_SAFETY_ON_NULL_RETURN_VAL(handler, NULL);

   eldbus_signal_handler_free_cb_add(handler, _on_signal_handler_free, obj);
   obj->signal_handlers = eina_list_append(obj->signal_handlers, handler);

   return handler;
}

EAPI Eldbus_Message *
eldbus_object_method_call_new(Eldbus_Object *obj, const char *interface, const char *member)
{
   ELDBUS_OBJECT_CHECK_RETVAL(obj, NULL);
   EINA_SAFETY_ON_NULL_RETURN_VAL(interface, NULL);
   EINA_SAFETY_ON_NULL_RETURN_VAL(member, NULL);

   return eldbus_message_method_call_new(obj->name, obj->path, interface, member);
}

Eina_Bool
eldbus_object_proxy_add(Eldbus_Object *obj, Eldbus_Proxy *proxy)
{
   return eina_hash_add(obj->proxies, eldbus_proxy_interface_get(proxy), proxy);
}

Eldbus_Proxy *
eldbus_object_proxy_get(Eldbus_Object *obj, const char *interface)
{
   return eina_hash_find(obj->proxies, interface);
}

Eina_Bool
eldbus_object_proxy_del(Eldbus_Object *obj, Eldbus_Proxy *proxy, const char *interface)
{
   return eina_hash_del(obj->proxies, interface, proxy);
}

EAPI Eldbus_Pending *
eldbus_object_peer_ping(Eldbus_Object *obj, Eldbus_Message_Cb cb, const void *data)
{
   Eldbus_Message *msg;
   Eldbus_Pending *p;
   ELDBUS_OBJECT_CHECK_RETVAL(obj, NULL);
   msg = eldbus_object_method_call_new(obj, ELDBUS_FDO_INTEFACE_PEER, "Ping");
   p = eldbus_object_send(obj, msg, cb, data, -1);
   return p;
}

EAPI Eldbus_Pending *
eldbus_object_peer_machine_id_get(Eldbus_Object *obj, Eldbus_Message_Cb cb, const void *data)
{
   Eldbus_Message *msg;
   Eldbus_Pending *p;
   ELDBUS_OBJECT_CHECK_RETVAL(obj, NULL);
   msg = eldbus_object_method_call_new(obj, ELDBUS_FDO_INTEFACE_PEER,
                                      "GetMachineId");
   p = eldbus_object_send(obj, msg, cb, data, -1);
   return p;
}

EAPI Eldbus_Pending *
eldbus_object_introspect(Eldbus_Object *obj, Eldbus_Message_Cb cb, const void *data)
{
   Eldbus_Message *msg;
   Eldbus_Pending *p;
   ELDBUS_OBJECT_CHECK_RETVAL(obj, NULL);
   msg = eldbus_object_method_call_new(obj, ELDBUS_FDO_INTERFACE_INTROSPECTABLE,
                                      "Introspect");
   p = eldbus_object_send(obj, msg, cb, data, -1);
   return p;
}