[Qemu-devel] [PATCH 1/7] qom: add user_creatable_add & user_creatable_del methods

["Daniel P. Berrange" <berrange@redhat.com>]

The QMP monitor code has two helper methods object_add
and qmp_object_del that are called from several places
in the code (QMP, HMP and main emulator startup).

We soon need to use this code from qemu-img, qemu-io
and qemu-nbd too, but don't want those to depend on
the monitor.

To avoid this, move object_add to user_creatable_add
an qmp_object_del to user_creatable_del, to the
object_interfaces.c file where they can be easily
shared with all users of QOM

Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
---
 hmp.c                           | 11 ++++--
 include/monitor/monitor.h       |  3 --
 include/qom/object_interfaces.h | 31 +++++++++++++++++
 qmp.c                           | 75 ++++------------------------------------
 qom/object_interfaces.c         | 76 +++++++++++++++++++++++++++++++++++++++++
 vl.c                            |  8 +++--
 6 files changed, 127 insertions(+), 77 deletions(-)

diff --git a/hmp.c b/hmp.c
index c2b2c16..57fa3f5 100644
--- a/hmp.c
+++ b/hmp.c
@@ -29,6 +29,7 @@
 #include "qapi/string-output-visitor.h"
 #include "qapi/util.h"
 #include "qapi-visit.h"
+#include "qom/object_interfaces.h"
 #include "ui/console.h"
 #include "block/qapi.h"
 #include "qemu-io.h"
@@ -1670,6 +1671,7 @@ void hmp_object_add(Monitor *mon, const QDict *qdict)
     void *dummy = NULL;
     OptsVisitor *ov;
     QDict *pdict;
+    Object *obj = NULL;
 
     opts = qemu_opts_from_qdict(qemu_find_opts("object"), qdict, &err);
     if (err) {
@@ -1696,12 +1698,12 @@ void hmp_object_add(Monitor *mon, const QDict *qdict)
         goto out_end;
     }
 
-    object_add(type, id, pdict, opts_get_visitor(ov), &err);
+    obj = user_creatable_add(type, id, pdict, opts_get_visitor(ov), &err);
 
 out_end:
     visit_end_struct(opts_get_visitor(ov), &err_end);
     if (!err && err_end) {
-        qmp_object_del(id, NULL);
+        user_creatable_del(id, NULL);
     }
     error_propagate(&err, err_end);
 out_clean:
@@ -1712,6 +1714,9 @@ out_clean:
     g_free(id);
     g_free(type);
     g_free(dummy);
+    if (obj) {
+        object_unref(obj);
+    }
 
 out:
     hmp_handle_error(mon, &err);
@@ -1944,7 +1949,7 @@ void hmp_object_del(Monitor *mon, const QDict *qdict)
     const char *id = qdict_get_str(qdict, "id");
     Error *err = NULL;
 
-    qmp_object_del(id, &err);
+    user_creatable_del(id, &err);
     hmp_handle_error(mon, &err);
 }
 
diff --git a/include/monitor/monitor.h b/include/monitor/monitor.h
index 91b95ae..aa0f373 100644
--- a/include/monitor/monitor.h
+++ b/include/monitor/monitor.h
@@ -43,9 +43,6 @@ void monitor_read_command(Monitor *mon, int show_prompt);
 int monitor_read_password(Monitor *mon, ReadLineFunc *readline_func,
                           void *opaque);
 
-void object_add(const char *type, const char *id, const QDict *qdict,
-                Visitor *v, Error **errp);
-
 AddfdInfo *monitor_fdset_add_fd(int fd, bool has_fdset_id, int64_t fdset_id,
                                 bool has_opaque, const char *opaque,
                                 Error **errp);
diff --git a/include/qom/object_interfaces.h b/include/qom/object_interfaces.h
index 283ae0d..3e2afeb 100644
--- a/include/qom/object_interfaces.h
+++ b/include/qom/object_interfaces.h
@@ -2,6 +2,8 @@
 #define OBJECT_INTERFACES_H
 
 #include "qom/object.h"
+#include "qapi/qmp/qdict.h"
+#include "qapi/visitor.h"
 
 #define TYPE_USER_CREATABLE "user-creatable"
 
@@ -72,4 +74,33 @@ void user_creatable_complete(Object *obj, Error **errp);
  * from implements USER_CREATABLE interface.
  */
 bool user_creatable_can_be_deleted(UserCreatable *uc, Error **errp);
+
+/**
+ * user_creatable_add:
+ * @type: the object type name
+ * @id: the unique ID for the object
+ * @qdict: the object parameters
+ * @v: the visitor
+ * @errp: if an error occurs, a pointer to an area to store the error
+ *
+ * Create an instance of the user creatable object @type, placing
+ * it in the object composition tree with name @id, initializing
+ * it with properties from @qdict
+ *
+ * Returns: the newly created object or NULL on error
+ */
+Object *user_creatable_add(const char *type, const char *id,
+                           const QDict *qdict,
+                           Visitor *v, Error **errp);
+
+/**
+ * user_creatable_del:
+ * @id: the unique ID for the object
+ * @errp: if an error occurs, a pointer to an area to store the error
+ *
+ * Delete an instance of the user creatable object identified
+ * by @id.
+ */
+void user_creatable_del(const char *id, Error **errp);
+
 #endif
diff --git a/qmp.c b/qmp.c
index 0a1fa19..70fdecd 100644
--- a/qmp.c
+++ b/qmp.c
@@ -622,65 +622,13 @@ void qmp_add_client(const char *protocol, const char *fdname,
     close(fd);
 }
 
-void object_add(const char *type, const char *id, const QDict *qdict,
-                Visitor *v, Error **errp)
-{
-    Object *obj;
-    ObjectClass *klass;
-    const QDictEntry *e;
-    Error *local_err = NULL;
-
-    klass = object_class_by_name(type);
-    if (!klass) {
-        error_setg(errp, "invalid object type: %s", type);
-        return;
-    }
-
-    if (!object_class_dynamic_cast(klass, TYPE_USER_CREATABLE)) {
-        error_setg(errp, "object type '%s' isn't supported by object-add",
-                   type);
-        return;
-    }
-
-    if (object_class_is_abstract(klass)) {
-        error_setg(errp, "object type '%s' is abstract", type);
-        return;
-    }
-
-    obj = object_new(type);
-    if (qdict) {
-        for (e = qdict_first(qdict); e; e = qdict_next(qdict, e)) {
-            object_property_set(obj, v, e->key, &local_err);
-            if (local_err) {
-                goto out;
-            }
-        }
-    }
-
-    object_property_add_child(object_get_objects_root(),
-                              id, obj, &local_err);
-    if (local_err) {
-        goto out;
-    }
-
-    user_creatable_complete(obj, &local_err);
-    if (local_err) {
-        object_property_del(object_get_objects_root(),
-                            id, &error_abort);
-        goto out;
-    }
-out:
-    if (local_err) {
-        error_propagate(errp, local_err);
-    }
-    object_unref(obj);
-}
 
 void qmp_object_add(const char *type, const char *id,
                     bool has_props, QObject *props, Error **errp)
 {
     const QDict *pdict = NULL;
     QmpInputVisitor *qiv;
+    Object *obj;
 
     if (props) {
         pdict = qobject_to_qdict(props);
@@ -691,27 +639,16 @@ void qmp_object_add(const char *type, const char *id,
     }
 
     qiv = qmp_input_visitor_new(props);
-    object_add(type, id, pdict, qmp_input_get_visitor(qiv), errp);
+    obj = user_creatable_add(type, id, pdict, qmp_input_get_visitor(qiv), errp);
     qmp_input_visitor_cleanup(qiv);
+    if (obj) {
+        object_unref(obj);
+    }
 }
 
 void qmp_object_del(const char *id, Error **errp)
 {
-    Object *container;
-    Object *obj;
-
-    container = object_get_objects_root();
-    obj = object_resolve_path_component(container, id);
-    if (!obj) {
-        error_setg(errp, "object id not found");
-        return;
-    }
-
-    if (!user_creatable_can_be_deleted(USER_CREATABLE(obj), errp)) {
-        error_setg(errp, "%s is in use, can not be deleted", id);
-        return;
-    }
-    object_unparent(obj);
+    user_creatable_del(id, errp);
 }
 
 MemoryDeviceInfoList *qmp_query_memory_devices(Error **errp)
diff --git a/qom/object_interfaces.c b/qom/object_interfaces.c
index a66cd60..d94995f 100644
--- a/qom/object_interfaces.c
+++ b/qom/object_interfaces.c
@@ -30,6 +30,82 @@ bool user_creatable_can_be_deleted(UserCreatable *uc, Error **errp)
     }
 }
 
+Object *user_creatable_add(const char *type, const char *id,
+                           const QDict *qdict,
+                           Visitor *v, Error **errp)
+{
+    Object *obj;
+    ObjectClass *klass;
+    const QDictEntry *e;
+    Error *local_err = NULL;
+
+    klass = object_class_by_name(type);
+    if (!klass) {
+        error_setg(errp, "invalid object type: %s", type);
+        return NULL;
+    }
+
+    if (!object_class_dynamic_cast(klass, TYPE_USER_CREATABLE)) {
+        error_setg(errp, "object type '%s' isn't supported by object-add",
+                   type);
+        return NULL;
+    }
+
+    if (object_class_is_abstract(klass)) {
+        error_setg(errp, "object type '%s' is abstract", type);
+        return NULL;
+    }
+
+    obj = object_new(type);
+    if (qdict) {
+        for (e = qdict_first(qdict); e; e = qdict_next(qdict, e)) {
+            object_property_set(obj, v, e->key, &local_err);
+            if (local_err) {
+                goto out;
+            }
+        }
+    }
+
+    object_property_add_child(object_get_objects_root(),
+                              id, obj, &local_err);
+    if (local_err) {
+        goto out;
+    }
+
+    user_creatable_complete(obj, &local_err);
+    if (local_err) {
+        object_property_del(object_get_objects_root(),
+                            id, &error_abort);
+        goto out;
+    }
+out:
+    if (local_err) {
+        error_propagate(errp, local_err);
+        object_unref(obj);
+        return NULL;
+    }
+    return obj;
+}
+
+void user_creatable_del(const char *id, Error **errp)
+{
+    Object *container;
+    Object *obj;
+
+    container = object_get_objects_root();
+    obj = object_resolve_path_component(container, id);
+    if (!obj) {
+        error_setg(errp, "object id not found");
+        return;
+    }
+
+    if (!user_creatable_can_be_deleted(USER_CREATABLE(obj), errp)) {
+        error_setg(errp, "%s is in use, can not be deleted", id);
+        return;
+    }
+    object_unparent(obj);
+}
+
 static void register_types(void)
 {
     static const TypeInfo uc_interface_info = {
diff --git a/vl.c b/vl.c
index 5aaea77..812e039 100644
--- a/vl.c
+++ b/vl.c
@@ -2834,6 +2834,7 @@ static int object_create(void *opaque, QemuOpts *opts, Error **errp)
     OptsVisitor *ov;
     QDict *pdict;
     bool (*type_predicate)(const char *) = opaque;
+    Object *obj = NULL;
 
     ov = opts_visitor_new(opts);
     pdict = qemu_opts_to_qdict(opts, NULL);
@@ -2858,13 +2859,13 @@ static int object_create(void *opaque, QemuOpts *opts, Error **errp)
         goto out;
     }
 
-    object_add(type, id, pdict, opts_get_visitor(ov), &err);
+    obj = user_creatable_add(type, id, pdict, opts_get_visitor(ov), &err);
     if (err) {
         goto out;
     }
     visit_end_struct(opts_get_visitor(ov), &err);
     if (err) {
-        qmp_object_del(id, NULL);
+        user_creatable_del(id, NULL);
     }
 
 out:
@@ -2874,6 +2875,9 @@ out:
     g_free(id);
     g_free(type);
     g_free(dummy);
+    if (obj) {
+        object_unref(obj);
+    }
     if (err) {
         error_report_err(err);
         return -1;
-- 
2.5.0