qom/object_interfaces.c

   1 #include "qemu/osdep.h"
   2 #include "qapi/error.h"
   3 #include "qapi/qmp/qdict.h"
   4 #include "qapi/qmp/qerror.h"
   5 #include "qom/object_interfaces.h"
   6 #include "qemu/module.h"
   7 #include "qemu/option.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     visit_start_struct(v, NULL, NULL, 0, &local_err);
  69     if (local_err) {
  70         goto out;
  71     }
  72     for (e = qdict_first(qdict); e; e = qdict_next(qdict, e)) {
  73         object_property_set(obj, v, e->key, &local_err);
  74         if (local_err) {
  75             break;
  76         }
  77     }
  78     if (!local_err) {
  79         visit_check_struct(v, &local_err);
  80     }
  81     visit_end_struct(v, NULL);
  82     if (local_err) {
  83         goto out;
  84     }
  85
  86     object_property_add_child(object_get_objects_root(),
  87                               id, obj, &local_err);
  88     if (local_err) {
  89         goto out;
  90     }
  91
  92     user_creatable_complete(obj, &local_err);
  93     if (local_err) {
  94         object_property_del(object_get_objects_root(),
  95                             id, &error_abort);
  96         goto out;
  97     }
  98 out:
  99     if (local_err) {
 100         error_propagate(errp, local_err);
 101         object_unref(obj);
 102         return NULL;
 103     }
 104     return obj;
 105 }
 106
 107
 108 Object *user_creatable_add_opts(QemuOpts *opts, Error **errp)
 109 {
 110     Visitor *v;
 111     QDict *pdict;
 112     Object *obj;
 113     const char *id = qemu_opts_id(opts);
 114     char *type = qemu_opt_get_del(opts, "qom-type");
 115
 116     if (!type) {
 117         error_setg(errp, QERR_MISSING_PARAMETER, "qom-type");
 118         return NULL;
 119     }
 120     if (!id) {
 121         error_setg(errp, QERR_MISSING_PARAMETER, "id");
 122         qemu_opt_set(opts, "qom-type", type, &error_abort);
 123         g_free(type);
 124         return NULL;
 125     }
 126
 127     qemu_opts_set_id(opts, NULL);
 128     pdict = qemu_opts_to_qdict(opts, NULL);
 129
 130     v = opts_visitor_new(opts);
 131     obj = user_creatable_add_type(type, id, pdict, v, errp);
 132     visit_free(v);
 133
 134     qemu_opts_set_id(opts, (char *) id);
 135     qemu_opt_set(opts, "qom-type", type, &error_abort);
 136     g_free(type);
 137     qobject_unref(pdict);
 138     return obj;
 139 }
 140
 141
 142 int user_creatable_add_opts_foreach(void *opaque, QemuOpts *opts, Error **errp)
 143 {
 144     bool (*type_opt_predicate)(const char *, QemuOpts *) = opaque;
 145     Object *obj = NULL;
 146     Error *err = NULL;
 147     const char *type;
 148
 149     type = qemu_opt_get(opts, "qom-type");
 150     if (type && type_opt_predicate &&
 151         !type_opt_predicate(type, opts)) {
 152         return 0;
 153     }
 154
 155     obj = user_creatable_add_opts(opts, &err);
 156     if (!obj) {
 157         error_report_err(err);
 158         return -1;
 159     }
 160     object_unref(obj);
 161     return 0;
 162 }
 163
 164
 165 void user_creatable_del(const char *id, Error **errp)
 166 {
 167     Object *container;
 168     Object *obj;
 169
 170     container = object_get_objects_root();
 171     obj = object_resolve_path_component(container, id);
 172     if (!obj) {
 173         error_setg(errp, "object '%s' not found", id);
 174         return;
 175     }
 176
 177     if (!user_creatable_can_be_deleted(USER_CREATABLE(obj))) {
 178         error_setg(errp, "object '%s' is in use, can not be deleted", id);
 179         return;
 180     }
 181
 182     /*
 183      * if object was defined on the command-line, remove its corresponding
 184      * option group entry
 185      */
 186     qemu_opts_del(qemu_opts_find(qemu_find_opts_err("object", &error_abort),
 187                                  id));
 188
 189     object_unparent(obj);
 190 }
 191
 192 void user_creatable_cleanup(void)
 193 {
 194     object_unparent(object_get_objects_root());
 195 }
 196
 197 static void register_types(void)
 198 {
 199     static const TypeInfo uc_interface_info = {
 200         .name          = TYPE_USER_CREATABLE,
 201         .parent        = TYPE_INTERFACE,
 202         .class_size = sizeof(UserCreatableClass),
 203     };
 204
 205     type_register_static(&uc_interface_info);
 206 }
 207
 208 type_init(register_types)