qom/object_interfaces.c

   1 #include "qemu/osdep.h"
   2
   3 #include "qemu/cutils.h"
   4 #include "qapi/error.h"
   5 #include "qapi/qmp/qdict.h"
   6 #include "qapi/qmp/qerror.h"
   7 #include "qapi/qmp/qjson.h"
   8 #include "qapi/qmp/qstring.h"
   9 #include "qapi/qobject-input-visitor.h"
  10 #include "qom/object_interfaces.h"
  11 #include "qemu/help_option.h"
  12 #include "qemu/module.h"
  13 #include "qemu/option.h"
  14 #include "qapi/opts-visitor.h"
  15 #include "qemu/config-file.h"
  16
  17 bool user_creatable_complete(UserCreatable *uc, Error **errp)
  18 {
  19     UserCreatableClass *ucc = USER_CREATABLE_GET_CLASS(uc);
  20     Error *err = NULL;
  21
  22     if (ucc->complete) {
  23         ucc->complete(uc, &err);
  24         error_propagate(errp, err);
  25     }
  26     return !err;
  27 }
  28
  29 bool user_creatable_can_be_deleted(UserCreatable *uc)
  30 {
  31
  32     UserCreatableClass *ucc = USER_CREATABLE_GET_CLASS(uc);
  33
  34     if (ucc->can_be_deleted) {
  35         return ucc->can_be_deleted(uc);
  36     } else {
  37         return true;
  38     }
  39 }
  40
  41 Object *user_creatable_add_type(const char *type, const char *id,
  42                                 const QDict *qdict,
  43                                 Visitor *v, Error **errp)
  44 {
  45     Object *obj;
  46     ObjectClass *klass;
  47     const QDictEntry *e;
  48     Error *local_err = NULL;
  49
  50     klass = object_class_by_name(type);
  51     if (!klass) {
  52         error_setg(errp, "invalid object type: %s", type);
  53         return NULL;
  54     }
  55
  56     if (!object_class_dynamic_cast(klass, TYPE_USER_CREATABLE)) {
  57         error_setg(errp, "object type '%s' isn't supported by object-add",
  58                    type);
  59         return NULL;
  60     }
  61
  62     if (object_class_is_abstract(klass)) {
  63         error_setg(errp, "object type '%s' is abstract", type);
  64         return NULL;
  65     }
  66
  67     assert(qdict);
  68     obj = object_new(type);
  69     if (!visit_start_struct(v, NULL, NULL, 0, &local_err)) {
  70         goto out;
  71     }
  72     for (e = qdict_first(qdict); e; e = qdict_next(qdict, e)) {
  73         object_property_set(obj, e->key, v, &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     if (id != NULL) {
  87         object_property_add_child(object_get_objects_root(),
  88                                   id, obj);
  89     }
  90
  91     user_creatable_complete(USER_CREATABLE(obj), &local_err);
  92     if (local_err) {
  93         if (id != NULL) {
  94             object_property_del(object_get_objects_root(), id);
  95         }
  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 bool user_creatable_add_dict(QDict *qdict, bool keyval, Error **errp)
 108 {
 109     Visitor *v;
 110     Object *obj;
 111     g_autofree char *type = NULL;
 112     g_autofree char *id = NULL;
 113
 114     type = g_strdup(qdict_get_try_str(qdict, "qom-type"));
 115     if (!type) {
 116         error_setg(errp, QERR_MISSING_PARAMETER, "qom-type");
 117         return false;
 118     }
 119     qdict_del(qdict, "qom-type");
 120
 121     id = g_strdup(qdict_get_try_str(qdict, "id"));
 122     if (!id) {
 123         error_setg(errp, QERR_MISSING_PARAMETER, "id");
 124         return false;
 125     }
 126     qdict_del(qdict, "id");
 127
 128     if (keyval) {
 129         v = qobject_input_visitor_new_keyval(QOBJECT(qdict));
 130     } else {
 131         v = qobject_input_visitor_new(QOBJECT(qdict));
 132     }
 133     obj = user_creatable_add_type(type, id, qdict, v, errp);
 134     visit_free(v);
 135     object_unref(obj);
 136     return !!obj;
 137 }
 138
 139 Object *user_creatable_add_opts(QemuOpts *opts, Error **errp)
 140 {
 141     Visitor *v;
 142     QDict *pdict;
 143     Object *obj;
 144     const char *id = qemu_opts_id(opts);
 145     char *type = qemu_opt_get_del(opts, "qom-type");
 146
 147     if (!type) {
 148         error_setg(errp, QERR_MISSING_PARAMETER, "qom-type");
 149         return NULL;
 150     }
 151     if (!id) {
 152         error_setg(errp, QERR_MISSING_PARAMETER, "id");
 153         qemu_opt_set(opts, "qom-type", type, &error_abort);
 154         g_free(type);
 155         return NULL;
 156     }
 157
 158     qemu_opts_set_id(opts, NULL);
 159     pdict = qemu_opts_to_qdict(opts, NULL);
 160
 161     v = opts_visitor_new(opts);
 162     obj = user_creatable_add_type(type, id, pdict, v, errp);
 163     visit_free(v);
 164
 165     qemu_opts_set_id(opts, (char *) id);
 166     qemu_opt_set(opts, "qom-type", type, &error_abort);
 167     g_free(type);
 168     qobject_unref(pdict);
 169     return obj;
 170 }
 171
 172
 173 int user_creatable_add_opts_foreach(void *opaque, QemuOpts *opts, Error **errp)
 174 {
 175     bool (*type_opt_predicate)(const char *, QemuOpts *) = opaque;
 176     Object *obj = NULL;
 177     const char *type;
 178
 179     type = qemu_opt_get(opts, "qom-type");
 180     if (type && type_opt_predicate &&
 181         !type_opt_predicate(type, opts)) {
 182         return 0;
 183     }
 184
 185     obj = user_creatable_add_opts(opts, errp);
 186     if (!obj) {
 187         return -1;
 188     }
 189     object_unref(obj);
 190     return 0;
 191 }
 192
 193 char *object_property_help(const char *name, const char *type,
 194                            QObject *defval, const char *description)
 195 {
 196     GString *str = g_string_new(NULL);
 197
 198     g_string_append_printf(str, "  %s=<%s>", name, type);
 199     if (description || defval) {
 200         if (str->len < 24) {
 201             g_string_append_printf(str, "%*s", 24 - (int)str->len, "");
 202         }
 203         g_string_append(str, " - ");
 204     }
 205     if (description) {
 206         g_string_append(str, description);
 207     }
 208     if (defval) {
 209         g_autofree char *def_json = qstring_free(qobject_to_json(defval), TRUE);
 210         g_string_append_printf(str, " (default: %s)", def_json);
 211     }
 212
 213     return g_string_free(str, false);
 214 }
 215
 216 bool user_creatable_print_help(const char *type, QemuOpts *opts)
 217 {
 218     ObjectClass *klass;
 219
 220     if (is_help_option(type)) {
 221         GSList *l, *list;
 222
 223         printf("List of user creatable objects:\n");
 224         list = object_class_get_list_sorted(TYPE_USER_CREATABLE, false);
 225         for (l = list; l != NULL; l = l->next) {
 226             ObjectClass *oc = OBJECT_CLASS(l->data);
 227             printf("  %s\n", object_class_get_name(oc));
 228         }
 229         g_slist_free(list);
 230         return true;
 231     }
 232
 233     klass = object_class_by_name(type);
 234     if (klass && qemu_opt_has_help_opt(opts)) {
 235         ObjectPropertyIterator iter;
 236         ObjectProperty *prop;
 237         GPtrArray *array = g_ptr_array_new();
 238         int i;
 239
 240         object_class_property_iter_init(&iter, klass);
 241         while ((prop = object_property_iter_next(&iter))) {
 242             if (!prop->set) {
 243                 continue;
 244             }
 245
 246             g_ptr_array_add(array,
 247                             object_property_help(prop->name, prop->type,
 248                                                  prop->defval, prop->description));
 249         }
 250         g_ptr_array_sort(array, (GCompareFunc)qemu_pstrcmp0);
 251         if (array->len > 0) {
 252             printf("%s options:\n", type);
 253         } else {
 254             printf("There are no options for %s.\n", type);
 255         }
 256         for (i = 0; i < array->len; i++) {
 257             printf("%s\n", (char *)array->pdata[i]);
 258         }
 259         g_ptr_array_set_free_func(array, g_free);
 260         g_ptr_array_free(array, true);
 261         return true;
 262     }
 263
 264     return false;
 265 }
 266
 267 bool user_creatable_del(const char *id, Error **errp)
 268 {
 269     Object *container;
 270     Object *obj;
 271
 272     container = object_get_objects_root();
 273     obj = object_resolve_path_component(container, id);
 274     if (!obj) {
 275         error_setg(errp, "object '%s' not found", id);
 276         return false;
 277     }
 278
 279     if (!user_creatable_can_be_deleted(USER_CREATABLE(obj))) {
 280         error_setg(errp, "object '%s' is in use, can not be deleted", id);
 281         return false;
 282     }
 283
 284     /*
 285      * if object was defined on the command-line, remove its corresponding
 286      * option group entry
 287      */
 288     qemu_opts_del(qemu_opts_find(qemu_find_opts_err("object", &error_abort),
 289                                  id));
 290
 291     object_unparent(obj);
 292     return true;
 293 }
 294
 295 void user_creatable_cleanup(void)
 296 {
 297     object_unparent(object_get_objects_root());
 298 }
 299
 300 static void register_types(void)
 301 {
 302     static const TypeInfo uc_interface_info = {
 303         .name          = TYPE_USER_CREATABLE,
 304         .parent        = TYPE_INTERFACE,
 305         .class_size = sizeof(UserCreatableClass),
 306     };
 307
 308     type_register_static(&uc_interface_info);
 309 }
 310
 311 type_init(register_types)