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;
  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     visit_check_struct(v, &local_err);
  67     if (local_err) {
  68         goto out_visit;
  69     }
  70
  71     obj = user_creatable_add_type(type, id, pdict, v, &local_err);
  72
  73 out_visit:
  74     visit_end_struct(v);
  75
  76 out:
  77     QDECREF(pdict);
  78     g_free(id);
  79     g_free(type);
  80     if (local_err) {
  81         error_propagate(errp, local_err);
  82         object_unref(obj);
  83         return NULL;
  84     }
  85     return obj;
  86 }
  87
  88
  89 Object *user_creatable_add_type(const char *type, const char *id,
  90                                 const QDict *qdict,
  91                                 Visitor *v, Error **errp)
  92 {
  93     Object *obj;
  94     ObjectClass *klass;
  95     const QDictEntry *e;
  96     Error *local_err = NULL;
  97
  98     klass = object_class_by_name(type);
  99     if (!klass) {
 100         error_setg(errp, "invalid object type: %s", type);
 101         return NULL;
 102     }
 103
 104     if (!object_class_dynamic_cast(klass, TYPE_USER_CREATABLE)) {
 105         error_setg(errp, "object type '%s' isn't supported by object-add",
 106                    type);
 107         return NULL;
 108     }
 109
 110     if (object_class_is_abstract(klass)) {
 111         error_setg(errp, "object type '%s' is abstract", type);
 112         return NULL;
 113     }
 114
 115     assert(qdict);
 116     obj = object_new(type);
 117     visit_start_struct(v, NULL, NULL, 0, &local_err);
 118     if (local_err) {
 119         goto out;
 120     }
 121     for (e = qdict_first(qdict); e; e = qdict_next(qdict, e)) {
 122         object_property_set(obj, v, e->key, &local_err);
 123         if (local_err) {
 124             break;
 125         }
 126     }
 127     if (!local_err) {
 128         visit_check_struct(v, &local_err);
 129     }
 130     visit_end_struct(v);
 131     if (local_err) {
 132         goto out;
 133     }
 134
 135     object_property_add_child(object_get_objects_root(),
 136                               id, obj, &local_err);
 137     if (local_err) {
 138         goto out;
 139     }
 140
 141     user_creatable_complete(obj, &local_err);
 142     if (local_err) {
 143         object_property_del(object_get_objects_root(),
 144                             id, &error_abort);
 145         goto out;
 146     }
 147 out:
 148     if (local_err) {
 149         error_propagate(errp, local_err);
 150         object_unref(obj);
 151         return NULL;
 152     }
 153     return obj;
 154 }
 155
 156
 157 Object *user_creatable_add_opts(QemuOpts *opts, Error **errp)
 158 {
 159     OptsVisitor *ov;
 160     QDict *pdict;
 161     Object *obj = NULL;
 162
 163     ov = opts_visitor_new(opts);
 164     pdict = qemu_opts_to_qdict(opts, NULL);
 165
 166     obj = user_creatable_add(pdict, opts_get_visitor(ov), errp);
 167     opts_visitor_cleanup(ov);
 168     QDECREF(pdict);
 169     return obj;
 170 }
 171
 172
 173 int user_creatable_add_opts_foreach(void *opaque, QemuOpts *opts, Error **errp)
 174 {
 175     bool (*type_predicate)(const char *) = opaque;
 176     Object *obj = NULL;
 177     Error *err = NULL;
 178     const char *type;
 179
 180     type = qemu_opt_get(opts, "qom-type");
 181     if (type && type_predicate &&
 182         !type_predicate(type)) {
 183         return 0;
 184     }
 185
 186     obj = user_creatable_add_opts(opts, &err);
 187     if (!obj) {
 188         error_report_err(err);
 189         return -1;
 190     }
 191     object_unref(obj);
 192     return 0;
 193 }
 194
 195
 196 void user_creatable_del(const char *id, Error **errp)
 197 {
 198     Object *container;
 199     Object *obj;
 200
 201     container = object_get_objects_root();
 202     obj = object_resolve_path_component(container, id);
 203     if (!obj) {
 204         error_setg(errp, "object '%s' not found", id);
 205         return;
 206     }
 207
 208     if (!user_creatable_can_be_deleted(USER_CREATABLE(obj), errp)) {
 209         error_setg(errp, "object '%s' is in use, can not be deleted", id);
 210         return;
 211     }
 212     object_unparent(obj);
 213 }
 214
 215 static void register_types(void)
 216 {
 217     static const TypeInfo uc_interface_info = {
 218         .name          = TYPE_USER_CREATABLE,
 219         .parent        = TYPE_INTERFACE,
 220         .class_size = sizeof(UserCreatableClass),
 221     };
 222
 223     type_register_static(&uc_interface_info);
 224 }
 225
 226 type_init(register_types)