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