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python/qemu/qmp.py: Preserve error context on re-raise
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>
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@ -181,10 +181,11 @@ def __get_events(self, wait: Union[bool, float] = False) -> None:
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self.__sock.settimeout(wait)
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try:
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ret = self.__json_read(only_event=True)
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except socket.timeout:
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raise QMPTimeoutError("Timeout waiting for event")
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except:
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raise QMPConnectError("Error while reading from socket")
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except socket.timeout as err:
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raise QMPTimeoutError("Timeout waiting for event") from err
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except Exception as err:
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msg = "Error while reading from socket"
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raise QMPConnectError(msg) from err
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if ret is None:
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raise QMPConnectError("Error while reading from socket")
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self.__sock.settimeout(None)
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