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python/qemu/qmp.py: Preserve error context on re-raise

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Use the "from ..." phrasing when re-raising errors to preserve their
initial context, to help aid debugging when things go wrong.

This also silences a pylint 2.6.0+ error.

Signed-off-by: John Snow <jsnow@redhat.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Reviewed-by: Kevin Wolf <kwolf@redhat.com>
Message-id: 20201006235817.3280413-18-jsnow@redhat.com
Signed-off-by: John Snow <jsnow@redhat.com>
This commit is contained in:
John Snow 2020-10-06 19:58:14 -04:00
parent af0db88254
commit d2b08b79b0
1 changed files with 5 additions and 4 deletions
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9
python/qemu/qmp.py
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@ -181,10 +181,11 @@ def __get_events(self, wait: Union[bool, float] = False) -> None:
self.__sock.settimeout(wait)
try:
ret = self.__json_read(only_event=True)
except socket.timeout:
raise QMPTimeoutError("Timeout waiting for event")
except:
raise QMPConnectError("Error while reading from socket")
except socket.timeout as err:
raise QMPTimeoutError("Timeout waiting for event") from err
except Exception as err:
msg = "Error while reading from socket"
raise QMPConnectError(msg) from err
if ret is None:
raise QMPConnectError("Error while reading from socket")
self.__sock.settimeout(None)