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authorJohn Snow <jsnow@redhat.com>2020-07-10 01:22:08 -0400
committerPhilippe Mathieu-Daudé <philmd@redhat.com>2020-07-14 22:22:22 +0200
commitef5d474472426eda6abf8128cdb1d026af94862b (patch)
tree8466eafbd5846a9d4882d4a27d492d64d929c4b5 /python
parente3a23b4803a3939c7e24e8946880f5ef369ef781 (diff)
python/qmp.py: Do not return None from cmd_obj
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> Reviewed-by: Kevin Wolf <kwolf@redhat.com> Message-Id: <20200710052220.3306-5-jsnow@redhat.com> Signed-off-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Diffstat (limited to 'python')
-rw-r--r--python/qemu/qmp.py14
1 files changed, 5 insertions, 9 deletions
diff --git a/python/qemu/qmp.py b/python/qemu/qmp.py
index aa8a666b8a..ef3c919b76 100644
--- a/python/qemu/qmp.py
+++ b/python/qemu/qmp.py
@@ -225,22 +225,18 @@ class QEMUMonitorProtocol:
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