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[PATCH v3 04/16] python/qmp.py: Do not return None from cmd_obj
From: |
John Snow |
Subject: |
[PATCH v3 04/16] python/qmp.py: Do not return None from cmd_obj |
Date: |
Thu, 4 Jun 2020 16:22:24 -0400 |
This makes typing the qmp library difficult, as it necessitates wrapping
Optional[] around the type for every return type up the stack. At some
point, it becomes difficult to discern or remember why it's None instead
of the expected object.
Use the python exception system to tell us exactly why we didn't get an
object. Remove this special-cased return.
Signed-off-by: John Snow <jsnow@redhat.com>
---
python/qemu/qmp.py | 14 +++++---------
1 file changed, 5 insertions(+), 9 deletions(-)
diff --git a/python/qemu/qmp.py b/python/qemu/qmp.py
index aa8a666b8ab..ef3c919b76c 100644
--- a/python/qemu/qmp.py
+++ b/python/qemu/qmp.py
@@ -225,22 +225,18 @@ def accept(self, timeout=15.0):
self.__sockfile = self.__sock.makefile(mode='r')
return self.__negotiate_capabilities()
- def cmd_obj(self, qmp_cmd):
+ def cmd_obj(self, qmp_cmd: QMPMessage) -> QMPMessage:
"""
Send a QMP command to the QMP Monitor.
@param qmp_cmd: QMP command to be sent as a Python dict
- @return QMP response as a Python dict or None if the connection has
- been closed
+ @return QMP response as a Python dict
"""
self.logger.debug(">>> %s", qmp_cmd)
- try:
- self.__sock.sendall(json.dumps(qmp_cmd).encode('utf-8'))
- except OSError as err:
- if err.errno == errno.EPIPE:
- return None
- raise err
+ self.__sock.sendall(json.dumps(qmp_cmd).encode('utf-8'))
resp = self.__json_read()
+ if resp is None:
+ raise QMPConnectError("Unexpected empty reply from server")
self.logger.debug("<<< %s", resp)
return resp
--
2.21.3
- [PATCH v3 00/16] python: add mypy support to python/qemu, John Snow, 2020/06/04
- [PATCH v3 04/16] python/qmp.py: Do not return None from cmd_obj,
John Snow <=
- [PATCH v3 03/16] python/qmp.py: re-absorb MonitorResponseError, John Snow, 2020/06/04
- [PATCH v3 05/16] python/qmp.py: add casts to JSON deserialization, John Snow, 2020/06/04
- [PATCH v3 06/16] python/qmp.py: add QMPProtocolError, John Snow, 2020/06/04
- [PATCH v3 02/16] iotests.py: use qemu.qmp type aliases, John Snow, 2020/06/04
- [PATCH v3 08/16] python/machine.py: reorder __init__, John Snow, 2020/06/04
- [PATCH v3 07/16] python/machine.py: Fix monitor address typing, John Snow, 2020/06/04
- [PATCH v3 09/16] python/machine.py: Don't modify state in _base_args(), John Snow, 2020/06/04
- [PATCH v3 12/16] python/machine.py: Add _qmp access shim, John Snow, 2020/06/04