qom/object_interfaces.c

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