Re: [PATCH v4] python/qemu/qmp.py: QMP debug with VM label

[Wainer dos Santos Moschetta <wainersm@redhat.com>]

On 3/16/20 7:32 AM, Oksana Vohchana wrote:
> QEMUMachine writes some messages to the default logger.
> But it sometimes hard to read the output if we have requests to
> more than one VM.

For example,  tests/acceptance/migration.py uses two VMs and reading the 
qmp outputs on avocado's log is very confusing. Certainly this change 
will help to improve that situation, just need to adapt 
tests/acceptance/avocado_qemu/__init__.py to create the QEMUMachine 
object with a name.

Anyway, this patch looks good to me so:

Reviewed-by: Wainer dos Santos Moschetta <wainersm@redhat.com>

Thanks!

> This patch adds a label to the logger in the debug mode.
>
> Signed-off-by: Oksana Vohchana <ovoshcha@redhat.com>
> ---
> v2:
>   - Instead of shown the label in the message it provides the label
>     only in the debug logger information.
> v3:
>   - Fixes coding style problems.
> v4:
>   - Use a suffix method to get a children's logger process from the parent.
> ---
>   python/qemu/machine.py | 3 ++-
>   python/qemu/qmp.py     | 5 ++++-
>   2 files changed, 6 insertions(+), 2 deletions(-)
>
> diff --git a/python/qemu/machine.py b/python/qemu/machine.py
> index 183d8f3d38..f53abfa492 100644
> --- a/python/qemu/machine.py
> +++ b/python/qemu/machine.py
> @@ -270,7 +270,8 @@ class QEMUMachine(object):
>                   self._vm_monitor = os.path.join(self._sock_dir,
>                                                   self._name + "-monitor.sock")
>                   self._remove_files.append(self._vm_monitor)
> -            self._qmp = qmp.QEMUMonitorProtocol(self._vm_monitor, server=True)
> +            self._qmp = qmp.QEMUMonitorProtocol(self._vm_monitor, server=True,
> +                                                nickname=self._name)
>   
>       def _post_launch(self):
>           if self._qmp:
> diff --git a/python/qemu/qmp.py b/python/qemu/qmp.py
> index f40586eedd..d6c9b2f4b1 100644
> --- a/python/qemu/qmp.py
> +++ b/python/qemu/qmp.py
> @@ -46,7 +46,7 @@ class QEMUMonitorProtocol:
>       #: Logger object for debugging messages
>       logger = logging.getLogger('QMP')
>   
> -    def __init__(self, address, server=False):
> +    def __init__(self, address, server=False, nickname=None):
>           """
>           Create a QEMUMonitorProtocol class.
>   
> @@ -62,6 +62,9 @@ class QEMUMonitorProtocol:
>           self.__address = address
>           self.__sock = self.__get_sock()
>           self.__sockfile = None
> +        self._nickname = nickname
> +        if self._nickname:
> +            self.logger = logging.getLogger('QMP').getChild(self._nickname)
>           if server:
>               self.__sock.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
>               self.__sock.bind(self.__address)