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qmp.py: Couple of pylint/style fixes 

No actual code changes, just initializing attributes earlier to avoid
AttributeError on early introspection, a few pylint/style fixes and
docstring clarifications.

Signed-off-by: Lukáš Doktor <ldoktor@redhat.com>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Message-Id: <20170818142613.32394-7-ldoktor@redhat.com>
Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
This commit is contained in:
Lukáš Doktor 2017-08-18 16:26:09 +02:00 committed by Eduardo Habkost
parent a004e249f0
commit 9d47f6de10
1 changed files with 24 additions and 13 deletions
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37
scripts/qmp/qmp.py
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@ -13,19 +13,30 @@ import errno
import socket
import sys
class QMPError(Exception):
pass
class QMPConnectError(QMPError):
pass
class QMPCapabilitiesError(QMPError):
pass
class QMPTimeoutError(QMPError):
pass
class QEMUMonitorProtocol:
#: Socket's error class
error = socket.error
#: Socket's timeout
timeout = socket.timeout
def __init__(self, address, server=False, debug=False):
"""
Create a QEMUMonitorProtocol class.
@ -42,6 +53,7 @@ class QEMUMonitorProtocol:
self.__address = address
self._debug = debug
self.__sock = self.__get_sock()
self.__sockfile = None
if server:
self.__sock.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
self.__sock.bind(self.__address)
@ -56,7 +68,7 @@ class QEMUMonitorProtocol:
def __negotiate_capabilities(self):
greeting = self.__json_read()
if greeting is None or not greeting.has_key('QMP'):
if greeting is None or "QMP" not in greeting:
raise QMPConnectError
# Greeting seems ok, negotiate capabilities
resp = self.cmd('qmp_capabilities')
@ -78,8 +90,6 @@ class QEMUMonitorProtocol:
continue
return resp
error = socket.error
def __get_events(self, wait=False):
"""
Check for new events in the stream and cache them in __events.
@ -89,8 +99,8 @@ class QEMUMonitorProtocol:
@raise QMPTimeoutError: If a timeout float is provided and the timeout
period elapses.
@raise QMPConnectError: If wait is True but no events could be retrieved
or if some other error occurred.
@raise QMPConnectError: If wait is True but no events could be
retrieved or if some other error occurred.
"""
# Check for new events regardless and pull them into the cache:
@ -175,7 +185,7 @@ class QEMUMonitorProtocol:
@param args: command arguments (dict)
@param id: command id (dict, list, string or int)
"""
qmp_cmd = { 'execute': name }
qmp_cmd = {'execute': name}
if args:
qmp_cmd['arguments'] = args
if id:
@ -183,6 +193,9 @@ class QEMUMonitorProtocol:
return self.cmd_obj(qmp_cmd)
def command(self, cmd, **kwds):
"""
Build and send a QMP command to the monitor, report errors if any
"""
ret = self.cmd(cmd, kwds)
if ret.has_key('error'):
raise Exception(ret['error']['desc'])
@ -190,15 +203,15 @@ class QEMUMonitorProtocol:
def pull_event(self, wait=False):
"""
Get and delete the first available QMP event.
Pulls a single event.
@param wait (bool): block until an event is available.
@param wait (float): If wait is a float, treat it as a timeout value.
@raise QMPTimeoutError: If a timeout float is provided and the timeout
period elapses.
@raise QMPConnectError: If wait is True but no events could be retrieved
or if some other error occurred.
@raise QMPConnectError: If wait is True but no events could be
retrieved or if some other error occurred.
@return The first available QMP event, or None.
"""
@ -217,8 +230,8 @@ class QEMUMonitorProtocol:
@raise QMPTimeoutError: If a timeout float is provided and the timeout
period elapses.
@raise QMPConnectError: If wait is True but no events could be retrieved
or if some other error occurred.
@raise QMPConnectError: If wait is True but no events could be
retrieved or if some other error occurred.
@return The list of available QMP events.
"""
@ -235,8 +248,6 @@ class QEMUMonitorProtocol:
self.__sock.close()
self.__sockfile.close()
timeout = socket.timeout
def settimeout(self, timeout):
self.__sock.settimeout(timeout)