Re: [Qemu-devel] [PATCH] migration: convert socket server to QIONetListener

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

Ping, any thoughts on this ?

NB, it will conflict with the multiple-sockets migration work I
expect, since IIRC that assumes it can get the GSource ID of the
migration listener, but that's not valid going forward, since
the GSource's are private to the QIONetListener. The callers
just register & unregister the callbacks.

On Thu, Jan 25, 2018 at 03:59:15PM +0000, Daniel P. Berrangé wrote:
> From: "Daniel P. Berrange" <berrange@redhat.com>
> 
> Instead of creating a QIOChannelSocket directly for the migration
> server socket, use a QIONetListener. This provides the ability
> to listen on multiple sockets at the same time, so enables
> full support for IPv4/IPv6 dual stack.
> 
> Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
> ---
>  migration/socket.c | 48 ++++++++++++++++--------------------------------
>  1 file changed, 16 insertions(+), 32 deletions(-)
> 
> diff --git a/migration/socket.c b/migration/socket.c
> index 3a8232dd2d..d0ef50765c 100644
> --- a/migration/socket.c
> +++ b/migration/socket.c
> @@ -24,6 +24,7 @@
>  #include "migration.h"
>  #include "qemu-file.h"
>  #include "io/channel-socket.h"
> +#include "io/net-listener.h"
>  #include "trace.h"
>  
>  
> @@ -130,34 +131,20 @@ void unix_start_outgoing_migration(MigrationState *s,
>  }
>  
>  
> -static gboolean socket_accept_incoming_migration(QIOChannel *ioc,
> -                                                 GIOCondition condition,
> -                                                 gpointer opaque)
> +static void socket_accept_incoming_migration(QIONetListener *listener,
> +                                             QIOChannelSocket *cioc,
> +                                             gpointer opaque)
>  {
> -    QIOChannelSocket *sioc;
> -    Error *err = NULL;
> -
> -    sioc = qio_channel_socket_accept(QIO_CHANNEL_SOCKET(ioc),
> -                                     &err);
> -    if (!sioc) {
> -        error_report("could not accept migration connection (%s)",
> -                     error_get_pretty(err));
> -        goto out;
> -    }
> -
>      trace_migration_socket_incoming_accepted();
>  
> -    qio_channel_set_name(QIO_CHANNEL(sioc), "migration-socket-incoming");
> -    migration_channel_process_incoming(QIO_CHANNEL(sioc));
> -    object_unref(OBJECT(sioc));
> +    qio_channel_set_name(QIO_CHANNEL(cioc), "migration-socket-incoming");
> +    migration_channel_process_incoming(QIO_CHANNEL(cioc));
>  
> -out:
>      if (migration_has_all_channels()) {
>          /* Close listening socket as its no longer needed */
> -        qio_channel_close(ioc, NULL);
> -        return G_SOURCE_REMOVE;
> -    } else {
> -        return G_SOURCE_CONTINUE;
> +        qio_net_listener_disconnect(listener);
> +
> +        object_unref(OBJECT(listener));
>      }
>  }
>  
> @@ -165,21 +152,18 @@ out:
>  static void socket_start_incoming_migration(SocketAddress *saddr,
>                                              Error **errp)
>  {
> -    QIOChannelSocket *listen_ioc = qio_channel_socket_new();
> +    QIONetListener *listener = qio_net_listener_new();
>  
> -    qio_channel_set_name(QIO_CHANNEL(listen_ioc),
> -                         "migration-socket-listener");
> +    qio_net_listener_set_name(listener, "migration-socket-listener");
>  
> -    if (qio_channel_socket_listen_sync(listen_ioc, saddr, errp) < 0) {
> -        object_unref(OBJECT(listen_ioc));
> +    if (qio_net_listener_open_sync(listener, saddr, errp) < 0) {
> +        object_unref(OBJECT(listener));
>          return;
>      }
>  
> -    qio_channel_add_watch(QIO_CHANNEL(listen_ioc),
> -                          G_IO_IN,
> -                          socket_accept_incoming_migration,
> -                          listen_ioc,
> -                          (GDestroyNotify)object_unref);
> +    qio_net_listener_set_client_func(listener,
> +                                     socket_accept_incoming_migration,
> +                                     NULL, NULL);
>  }
>  
>  void tcp_start_incoming_migration(const char *host_port, Error **errp)
> -- 
> 2.14.3
> 

Regards,
Daniel
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