qom/object_interfaces.c

   1 #include "qemu/osdep.h"
   2 #include "qapi/error.h"
   3 #include "qom/object_interfaces.h"
   4 #include "qemu/module.h"
   5 #include "qapi-visit.h"
   6 #include "qapi/qmp-output-visitor.h"
   7 #include "qapi/opts-visitor.h"
   8
   9 void user_creatable_complete(Object *obj, Error **errp)
  10 {
  11
  12     UserCreatableClass *ucc;
  13     UserCreatable *uc =
  14         (UserCreatable *)object_dynamic_cast(obj, TYPE_USER_CREATABLE);
  15
  16     if (!uc) {
  17         return;
  18     }
  19
  20     ucc = USER_CREATABLE_GET_CLASS(uc);
  21     if (ucc->complete) {
  22         ucc->complete(uc, errp);
  23     }
  24 }
  25
  26 bool user_creatable_can_be_deleted(UserCreatable *uc, Error **errp)
  27 {
  28
  29     UserCreatableClass *ucc = USER_CREATABLE_GET_CLASS(uc);
  30
  31     if (ucc->can_be_deleted) {
  32         return ucc->can_be_deleted(uc, errp);
  33     } else {
  34         return true;
  35     }
  36 }
  37
  38
  39 Object *user_creatable_add(const QDict *qdict,
  40                            Visitor *v, Error **errp)
  41 {
  42     char *type = NULL;
  43     char *id = NULL;
  44     Object *obj = NULL;
  45     Error *local_err = NULL, *end_err = NULL;
  46     QDict *pdict;
  47
  48     pdict = qdict_clone_shallow(qdict);
  49
  50     visit_start_struct(v, NULL, NULL, 0, &local_err);
  51     if (local_err) {
  52         goto out;
  53     }
  54
  55     qdict_del(pdict, "qom-type");
  56     visit_type_str(v, "qom-type", &type, &local_err);
  57     if (local_err) {
  58         goto out_visit;
  59     }
  60
  61     qdict_del(pdict, "id");
  62     visit_type_str(v, "id", &id, &local_err);
  63     if (local_err) {
  64         goto out_visit;
  65     }
  66
  67     obj = user_creatable_add_type(type, id, pdict, v, &local_err);
  68     if (local_err) {
  69         goto out_visit;
  70     }
  71
  72  out_visit:
  73     visit_end_struct(v, &end_err);
  74     if (end_err) {
  75         error_propagate(&local_err, end_err);
  76         if (obj) {
  77             user_creatable_del(id, NULL);
  78         }
  79         goto out;
  80     }
  81
  82 out:
  83     QDECREF(pdict);
  84     g_free(id);
  85     g_free(type);
  86     if (local_err) {
  87         error_propagate(errp, local_err);
  88         object_unref(obj);
  89         return NULL;
  90     }
  91     return obj;
  92 }
  93
  94
  95 Object *user_creatable_add_type(const char *type, const char *id,
  96                                 const QDict *qdict,
  97                                 Visitor *v, Error **errp)
  98 {
  99     Object *obj;
 100     ObjectClass *klass;
 101     const QDictEntry *e;
 102     Error *local_err = NULL;
 103
 104     klass = object_class_by_name(type);
 105     if (!klass) {
 106         error_setg(errp, "invalid object type: %s", type);
 107         return NULL;
 108     }
 109
 110     if (!object_class_dynamic_cast(klass, TYPE_USER_CREATABLE)) {
 111         error_setg(errp, "object type '%s' isn't supported by object-add",
 112                    type);
 113         return NULL;
 114     }
 115
 116     if (object_class_is_abstract(klass)) {
 117         error_setg(errp, "object type '%s' is abstract", type);
 118         return NULL;
 119     }
 120
 121     obj = object_new(type);
 122     if (qdict) {
 123         for (e = qdict_first(qdict); e; e = qdict_next(qdict, e)) {
 124             object_property_set(obj, v, e->key, &local_err);
 125             if (local_err) {
 126                 goto out;
 127             }
 128         }
 129     }
 130
 131     object_property_add_child(object_get_objects_root(),
 132                               id, obj, &local_err);
 133     if (local_err) {
 134         goto out;
 135     }
 136
 137     user_creatable_complete(obj, &local_err);
 138     if (local_err) {
 139         object_property_del(object_get_objects_root(),
 140                             id, &error_abort);
 141         goto out;
 142     }
 143 out:
 144     if (local_err) {
 145         error_propagate(errp, local_err);
 146         object_unref(obj);
 147         return NULL;
 148     }
 149     return obj;
 150 }
 151
 152
 153 Object *user_creatable_add_opts(QemuOpts *opts, Error **errp)
 154 {
 155     OptsVisitor *ov;
 156     QDict *pdict;
 157     Object *obj = NULL;
 158
 159     ov = opts_visitor_new(opts);
 160     pdict = qemu_opts_to_qdict(opts, NULL);
 161
 162     obj = user_creatable_add(pdict, opts_get_visitor(ov), errp);
 163     opts_visitor_cleanup(ov);
 164     QDECREF(pdict);
 165     return obj;
 166 }
 167
 168
 169 int user_creatable_add_opts_foreach(void *opaque, QemuOpts *opts, Error **errp)
 170 {
 171     bool (*type_predicate)(const char *) = opaque;
 172     Object *obj = NULL;
 173     const char *type;
 174
 175     type = qemu_opt_get(opts, "qom-type");
 176     if (type && type_predicate &&
 177         !type_predicate(type)) {
 178         return 0;
 179     }
 180
 181     obj = user_creatable_add_opts(opts, errp);
 182     if (!obj) {
 183         return -1;
 184     }
 185     object_unref(obj);
 186     return 0;
 187 }
 188
 189
 190 void user_creatable_del(const char *id, Error **errp)
 191 {
 192     Object *container;
 193     Object *obj;
 194
 195     container = object_get_objects_root();
 196     obj = object_resolve_path_component(container, id);
 197     if (!obj) {
 198         error_setg(errp, "object '%s' not found", id);
 199         return;
 200     }
 201
 202     if (!user_creatable_can_be_deleted(USER_CREATABLE(obj), errp)) {
 203         error_setg(errp, "object '%s' is in use, can not be deleted", id);
 204         return;
 205     }
 206     object_unparent(obj);
 207 }
 208
 209 static void register_types(void)
 210 {
 211     static const TypeInfo uc_interface_info = {
 212         .name          = TYPE_USER_CREATABLE,
 213         .parent        = TYPE_INTERFACE,
 214         .class_size = sizeof(UserCreatableClass),
 215     };
 216
 217     type_register_static(&uc_interface_info);
 218 }
 219
 220 type_init(register_types)