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python/machine.py: Add _qmp access shim 

Like many other Optional[] types, it's not always a given that this
object will be set. Wrap it in a type-shim that raises a meaningful
error and will always return a concrete type.

Signed-off-by: John Snow <jsnow@redhat.com>
Reviewed-by: Kevin Wolf <kwolf@redhat.com>
Message-id: 20201006235817.3280413-8-jsnow@redhat.com
Signed-off-by: John Snow <jsnow@redhat.com>
master
John Snow 2020-10-06 19:58:04 -04:00
parent aaa81ec609
commit be1183e52f
1 changed files with 13 additions and 11 deletions
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24
python/qemu/machine.py
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@ -135,7 +135,7 @@ class QEMUMachine:
self._events = []
self._iolog = None
self._qmp_set = True # Enable QMP monitor by default.
self._qmp = None
self._qmp_connection: Optional[qmp.QEMUMonitorProtocol] = None
self._qemu_full_args = None
self._temp_dir = None
self._launched = False
@ -302,14 +302,14 @@ class QEMUMachine:
if self._remove_monitor_sockfile:
assert isinstance(self._monitor_address, str)
self._remove_files.append(self._monitor_address)
self._qmp = qmp.QEMUMonitorProtocol(
self._qmp_connection = qmp.QEMUMonitorProtocol(
self._monitor_address,
server=True,
nickname=self._name
)
def _post_launch(self):
if self._qmp:
if self._qmp_connection:
self._qmp.accept()
def _post_shutdown(self):
@ -320,9 +320,9 @@ class QEMUMachine:
# Comprehensive reset for the failed launch case:
self._early_cleanup()
if self._qmp:
if self._qmp_connection:
self._qmp.close()
self._qmp = None
self._qmp_connection = None
self._load_io_log()
@ -434,7 +434,7 @@ class QEMUMachine:
"""
self._early_cleanup()
if self._qmp is not None:
if self._qmp_connection:
if not has_quit:
# Might raise ConnectionReset
self._qmp.cmd('quit')
@ -515,11 +515,13 @@ class QEMUMachine:
line. Default is True.
@note: call this function before launch().
"""
if enabled:
self._qmp_set = True
else:
self._qmp_set = False
self._qmp = None
self._qmp_set = enabled
@property
def _qmp(self) -> qmp.QEMUMonitorProtocol:
if self._qmp_connection is None:
raise QEMUMachineError("Attempt to access QMP with no connection")
return self._qmp_connection
@classmethod
def _qmp_args(cls, _conv_keys: bool = True, **args: Any) -> Dict[str, Any]: