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python/qemu/machine: use socketpair() for QMP by default

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When no monitor address is given, establish the QMP communication through
a socketpair() (API is also supported on Windows since Python 3.5)

Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
Message-id: 20230111080101.969151-4-marcandre.lureau@redhat.com
[Resolved conflicts, fixed typing error. --js]
Signed-off-by: John Snow <jsnow@redhat.com>
This commit is contained in:
Marc-André Lureau 2023-01-11 12:01:01 +04:00 committed by John Snow
parent 603a3bad4b
commit bd4c0ef409
1 changed files with 17 additions and 8 deletions
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25
python/qemu/machine/machine.py
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@ -158,17 +158,13 @@ def __init__(self,
self._qmp_timer = qmp_timer
self._name = name or f"{id(self):x}"
self._sock_pair: Optional[Tuple[socket.socket, socket.socket]] = None
self._temp_dir: Optional[str] = None
self._base_temp_dir = base_temp_dir
self._sock_dir = sock_dir
self._log_dir = log_dir
if monitor_address is not None:
self._monitor_address = monitor_address
else:
self._monitor_address = os.path.join(
self.sock_dir, f"{self._name}.qmp"
)
self._monitor_address = monitor_address
self._console_log_path = console_log
if self._console_log_path:
@ -303,7 +299,11 @@ def _base_args(self) -> List[str]:
args = ['-display', 'none', '-vga', 'none']
if self._qmp_set:
if isinstance(self._monitor_address, tuple):
if self._sock_pair:
fd = self._sock_pair[0].fileno()
os.set_inheritable(fd, True)
moncdev = f"socket,id=mon,fd={fd}"
elif isinstance(self._monitor_address, tuple):
moncdev = "socket,id=mon,host={},port={}".format(
*self._monitor_address
)
@ -337,10 +337,17 @@ def _pre_launch(self) -> None:
self._remove_files.append(self._console_address)
if self._qmp_set:
monitor_address = None
sock = None
if self._monitor_address is None:
self._sock_pair = socket.socketpair()
sock = self._sock_pair[1]
if isinstance(self._monitor_address, str):
self._remove_files.append(self._monitor_address)
monitor_address = self._monitor_address
self._qmp_connection = QEMUMonitorProtocol(
self._monitor_address,
address=monitor_address,
sock=sock,
server=True,
nickname=self._name
)
@ -360,6 +367,8 @@ def _pre_launch(self) -> None:
))
def _post_launch(self) -> None:
if self._sock_pair:
self._sock_pair[0].close()
if self._qmp_connection:
self._qmp.accept(self._qmp_timer)