Re: [libvirt-glib PATCHv4 4/7] gobject: Add API to query connection interfaces

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On Wed, Jul 01, 2015 at 09:40:48PM +0100, Zeeshan Ali (Khattak) wrote:
> Add API to query network interfaces from a connection.
> ---
>  libvirt-gobject/libvirt-gobject-connection.c | 265 +++++++++++++++++++++++++++
>  libvirt-gobject/libvirt-gobject-connection.h |  13 +-
>  libvirt-gobject/libvirt-gobject.sym          |   7 +
>  3 files changed, 283 insertions(+), 2 deletions(-)
> 
> diff --git a/libvirt-gobject/libvirt-gobject-connection.c b/libvirt-gobject/libvirt-gobject-connection.c
> index f7a6066..47b6861 100644
> --- a/libvirt-gobject/libvirt-gobject-connection.c
> +++ b/libvirt-gobject/libvirt-gobject-connection.c
> @@ -44,6 +44,7 @@ struct _GVirConnectionPrivate
>  
>      GHashTable *domains;
>      GHashTable *pools;
> +    GHashTable *interfaces;
>  };
>  
>  G_DEFINE_TYPE(GVirConnection, gvir_connection, G_TYPE_OBJECT);
> @@ -252,6 +253,10 @@ static void gvir_connection_init(GVirConnection *conn)
>                                          g_str_equal,
>                                          NULL,
>                                          g_object_unref);
> +    priv->interfaces = g_hash_table_new_full(g_str_hash,
> +                                             g_str_equal,
> +                                             NULL,
> +                                             g_object_unref);
>  }
>  
>  
> @@ -662,6 +667,11 @@ void gvir_connection_close(GVirConnection *conn)
>          priv->pools = NULL;
>      }
>  
> +    if (priv->interfaces) {
> +        g_hash_table_unref(priv->interfaces);
> +        priv->interfaces = NULL;
> +    }
> +
>      if (priv->conn) {
>          virConnectDomainEventDeregister(priv->conn, domain_event_cb);
>          virConnectClose(priv->conn);
> @@ -1431,6 +1441,261 @@ GVirDomain *gvir_connection_start_domain(GVirConnection *conn,
>  }
>  
>  /**
> + * gvir_connection_fetch_interfaces:
> + * @conn: a #GVirConnection
> + * @cancellable: (allow-none)(transfer none): cancellation object
> + * @err: return location for any errors
> + *
> + * Use this method to fetch information on all network interfaces

s/on/about ?

> + * managed by connection @conn on host machine. Use
> + * #gvir_connection_get_interfaces or #gvir_connection_get_interface after
> + * wards to query the fetched interfaces.

'afterwards' is a single word

> + *
> + * Return value: %TRUE on success, %FALSE otherwise and @err is set.
> + */
> +gboolean gvir_connection_fetch_interfaces(GVirConnection *conn,
> +                                          GCancellable *cancellable,
> +                                          GError **err)
> +{
> +    GVirConnectionPrivate *priv;
> +    GHashTable *interfaces;
> +    virInterfacePtr *ifaces = NULL;
> +    gint ninterfaces = 0;
> +    gboolean ret = FALSE;
> +    gint i;
> +    virConnectPtr vconn = NULL;
> +
> +    g_return_val_if_fail(GVIR_IS_CONNECTION(conn), FALSE);
> +    g_return_val_if_fail((cancellable == NULL) || G_IS_CANCELLABLE(cancellable),
> +                         FALSE);
> +    g_return_val_if_fail((err == NULL) || (*err == NULL), FALSE);
> +
> +    priv = conn->priv;
> +    g_mutex_lock(priv->lock);
> +    if (!priv->conn) {
> +        g_set_error_literal(err, GVIR_CONNECTION_ERROR,
> +                            0,
> +                            _("Connection is not open"));
> +        g_mutex_unlock(priv->lock);
> +        goto cleanup;
> +    }
> +    vconn = priv->conn;
> +    /* Stop another thread closing the connection just at the minute */
> +    virConnectRef(vconn);
> +    g_mutex_unlock(priv->lock);
> +
> +    if (g_cancellable_set_error_if_cancelled(cancellable, err))
> +        goto cleanup;
> +
> +    ninterfaces = virConnectListAllInterfaces(vconn, &ifaces, 0);
> +    if (ninterfaces < 0) {
> +        gvir_set_error(err, GVIR_CONNECTION_ERROR,
> +                       0,
> +                       _("Failed to fetch list of interfaces"));
> +        goto cleanup;
> +    }
> +
> +    if (g_cancellable_set_error_if_cancelled(cancellable, err))
> +        goto cleanup;
> +
> +    interfaces = g_hash_table_new_full(g_str_hash,
> +                                       g_str_equal,
> +                                       NULL,
> +                                       g_object_unref);
> +
> +    for (i = 0 ; i < ninterfaces; i++) {
> +        if (g_cancellable_set_error_if_cancelled(cancellable, err))
> +            goto cleanup;
> +
> +        GVirInterface *iface;
> +

I'd put this before the cancellable check.

> +        iface = GVIR_INTERFACE(g_object_new(GVIR_TYPE_INTERFACE,
> +                                              "handle", ifaces[i],
> +                                              NULL));
> +

parameter alignment is off here


> +        g_hash_table_insert(interfaces,
> +                            (gpointer)gvir_interface_get_name(iface),
> +                            iface);
> +    }
> +
> +    g_mutex_lock(priv->lock);
> +    if (priv->interfaces)
> +        g_hash_table_unref(priv->interfaces);
> +    priv->interfaces = interfaces;
> +    g_mutex_unlock(priv->lock);
> +
> +    ret = TRUE;
> +
> +cleanup:
> +    if (ninterfaces > 0) {
> +        for (i = 0 ; i < ninterfaces; i++)
> +            virInterfaceFree(ifaces[i]);
> +        free(ifaces);
> +    }
> +    if (vconn != NULL)
> +        virConnectClose(vconn);
> +    return ret;
> +}
> +
> +static void
> +gvir_connection_fetch_interfaces_helper(GTask *res,
> +                                        gpointer object,
> +                                        gpointer task_data G_GNUC_UNUSED,
> +                                        GCancellable *cancellable)
> +{
> +    GVirConnection *conn = GVIR_CONNECTION(object);
> +    GError *err = NULL;
> +
> +    if (!gvir_connection_fetch_interfaces(conn, cancellable, &err))
> +        g_task_return_error(res, err);
> +    else
> +        g_task_return_boolean(res, TRUE);
> +}
> +
> +
> +/**
> + * gvir_connection_fetch_interfaces_async:
> + * @conn: a #GVirConnection
> + * @cancellable: (allow-none)(transfer none): cancellation object
> + * @callback: (scope async): completion callback
> + * @user_data: (closure): opaque data for callback
> + */
> +void gvir_connection_fetch_interfaces_async(GVirConnection *conn,
> +                                            GCancellable *cancellable,
> +                                            GAsyncReadyCallback callback,
> +                                            gpointer user_data)
> +{
> +    GTask *res;

GTask *task; would be great

> +
> +    g_return_if_fail(GVIR_IS_CONNECTION(conn));
> +    g_return_if_fail((cancellable == NULL) || G_IS_CANCELLABLE(cancellable));
> +
> +    res = g_task_new(G_OBJECT(conn),
> +                     cancellable,
> +                     callback,
> +                     user_data);
> +    g_task_set_source_tag(res,
> +                          gvir_connection_fetch_interfaces_async);

Same comment as in the other patch regarding unneeded
g_task_set_source_tag() (or adding a check in gvir_connection_fetch_interfaces_helper)

> +    g_task_run_in_thread(res,
> +                         gvir_connection_fetch_interfaces_helper);
> +    g_object_unref(res);
> +}
> +
> +/**
> + * gvir_connection_fetch_interfaces_finish:
> + * @conn: a #GVirConnection
> + * @result: (transfer none): async method result
> + * @err: return location for any errors
> + */
> +gboolean gvir_connection_fetch_interfaces_finish(GVirConnection *conn,
> +                                                 GAsyncResult *result,
> +                                                 GError **err)
> +{
> +    g_return_val_if_fail(GVIR_IS_CONNECTION(conn), FALSE);
> +    g_return_val_if_fail(g_task_is_valid(result, G_OBJECT(conn)),
> +                         FALSE);
> +
> +    return g_task_propagate_boolean(G_TASK(result), err);
> +}
> +
> +/**
> + * gvir_connection_get_interfaces:
> + * @conn: a #GVirConnection
> + *
> + * Gets a list of all the network interfaces managed by connection @conn on
> + * host machine.


I think most other documentation blocks in this patch use "Get a list"
rather than "Gets a list"

> + *
> + * Return value: (element-type LibvirtGObject.Interface) (transfer full): List
> + * of #GVirInterface. The returned list should be freed with g_list_free(),
> + * after its elements have been unreffed with g_object_unref().
> + */
> +GList *gvir_connection_get_interfaces(GVirConnection *conn)
> +{
> +    GVirConnectionPrivate *priv;
> +    GList *interfaces = NULL;
> +
> +    g_return_val_if_fail(GVIR_IS_CONNECTION(conn), NULL);
> +
> +    priv = conn->priv;
> +    g_mutex_lock(priv->lock);
> +    if (priv->interfaces != NULL) {
> +        interfaces = g_hash_table_get_values(priv->interfaces);
> +        g_list_foreach(interfaces, gvir_domain_ref, NULL);
> +    }
> +    g_mutex_unlock(priv->lock);
> +
> +    return interfaces;
> +}
> +
> +/**
> + * gvir_connection_get_interface:
> + * @conn: a #GVirConnection

+ * @name: interface name to lookup


> + *
> + * Get a particular interface which has name @name.
> + *
> + * Return value: (transfer full): A new reference to a #GVirInterface, or NULL
> + * if no interface exists with name @name. The returned object must be unreffed
> + * using g_object_unref() once used.
> + */
> +GVirInterface *gvir_connection_get_interface(GVirConnection *conn,
> +                                             const gchar *name)
> +{
> +    GVirConnectionPrivate *priv;
> +    GVirInterface *iface;
> +
> +    g_return_val_if_fail(GVIR_IS_CONNECTION(conn), NULL);
> +    g_return_val_if_fail(name != NULL, NULL);
> +
> +    priv = conn->priv;
> +    g_mutex_lock(priv->lock);
> +    iface = g_hash_table_lookup(priv->interfaces, name);
> +    if (iface)
> +        g_object_ref(iface);
> +    g_mutex_unlock(priv->lock);
> +
> +    return iface;
> +}
> +
> +/**
> + * gvir_connection_find_interface_by_mac:
> + * @conn: a #GVirConnection

+ * @mac: MAC address to lookup

> + *
> + * Get a particular interface which has MAC address @mac.
> + *
> + * Return value: (transfer full): A new reference to a #GVirInterface, or NULL
> + * if no interface exists with MAC address @mac. The returned object must be
> + * unreffed using g_object_unref() once used.
> + */
> +GVirInterface *gvir_connection_find_interface_by_mac(GVirConnection *conn,
> +                                                     const gchar *mac)
> +{
> +    GVirConnectionPrivate *priv;
> +    GHashTableIter iter;
> +    gpointer key, value;
> +
> +    g_return_val_if_fail(GVIR_IS_CONNECTION(conn), NULL);
> +    g_return_val_if_fail(mac != NULL, NULL);
> +
> +    priv = conn->priv;
> +    g_mutex_lock(priv->lock);
> +    g_hash_table_iter_init(&iter, priv->interfaces);
> +
> +    while (g_hash_table_iter_next(&iter, &key, &value)) {
> +        GVirInterface *iface = value;
> +        const gchar *thismac = gvir_interface_get_mac(iface);
> +
> +        if (g_strcmp0(thismac, mac) == 0) {
> +            g_object_ref(iface);
> +            g_mutex_unlock(priv->lock);
> +            return iface;
> +        }
> +    }
> +    g_mutex_unlock(priv->lock);
> +
> +    return NULL;
> +}
> +
> +/**
>   * gvir_connection_create_storage_pool:
>   * @conn: a #GVirConnection on which to create the pool
>   * @conf: the configuration for the new storage pool
> diff --git a/libvirt-gobject/libvirt-gobject-connection.h b/libvirt-gobject/libvirt-gobject-connection.h
> index 8bca8d4..0c22a58 100644
> --- a/libvirt-gobject/libvirt-gobject-connection.h
> +++ b/libvirt-gobject/libvirt-gobject-connection.h
> @@ -144,14 +144,23 @@ GVirDomain *gvir_connection_start_domain(GVirConnection *conn,
>                                           guint flags,
>                                           GError **err);
>  
> -#if 0
> +gboolean gvir_connection_fetch_interfaces(GVirConnection *conn,
> +                                          GCancellable *cancellable,
> +                                          GError **err);
> +void gvir_connection_fetch_interfaces_async(GVirConnection *conn,
> +                                            GCancellable *cancellable,
> +                                            GAsyncReadyCallback callback,
> +                                            gpointer user_data);
> +gboolean gvir_connection_fetch_interfaces_finish(GVirConnection *conn,
> +                                                 GAsyncResult *result,
> +                                                 GError **err);
>  GList *gvir_connection_get_interfaces(GVirConnection *conn);
>  GVirInterface *gvir_connection_get_interface(GVirConnection *conn,
>                                               const gchar *name);
>  GVirInterface *gvir_connection_find_interface_by_mac(GVirConnection *conn,
>                                                       const gchar *macaddr);
>  
> -
> +#if 0
>  GList *gvir_connection_get_networks(GVirConnection *conn);
>  GVirNetwork *gvir_connection_get_network(GVirConnection *conn,
>                                           const gchar *uuid);
> diff --git a/libvirt-gobject/libvirt-gobject.sym b/libvirt-gobject/libvirt-gobject.sym
> index 29c4349..1effcda 100644
> --- a/libvirt-gobject/libvirt-gobject.sym
> +++ b/libvirt-gobject/libvirt-gobject.sym
> @@ -273,6 +273,13 @@ LIBVIRT_GOBJECT_0.2.1 {
>  
>  LIBVIRT_GOBJECT_0.2.2 {
>    global:
> +	gvir_connection_fetch_interfaces;
> +	gvir_connection_fetch_interfaces_async;
> +	gvir_connection_fetch_interfaces_finish;
> +	gvir_connection_find_interface_by_mac;
> +	gvir_connection_get_interface;
> +	gvir_connection_get_interfaces;
> +
>  	gvir_interface_get_mac;
>  } LIBVIRT_GOBJECT_0.2.1;
>  

All in all looks good apart from these minor comments, ACK.

> -- 
> 2.4.3
> 
> --
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> libvir-list@xxxxxxxxxx
> https://www.redhat.com/mailman/listinfo/libvir-list

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