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# QEMU Monitor Protocol Python class
#
# Copyright (C) 2009 Red Hat Inc.
#
# Authors:
# Luiz Capitulino <lcapitulino@redhat.com>
#
# This work is licensed under the terms of the GNU GPL, version 2. See
# the COPYING file in the top-level directory.
import socket, json
class QMPError(Exception):
pass
class QMPConnectError(QMPError):
pass
class QEMUMonitorProtocol:
def connect(self):
self.sock.connect(self.filename)
data = self.__json_read()
if data == None:
raise QMPConnectError
if not data.has_key('QMP'):
raise QMPConnectError
return data['QMP']['capabilities']
def close(self):
self.sock.close()
def send_raw(self, line):
self.sock.send(str(line))
return self.__json_read()
def send(self, cmdline):
cmd = self.__build_cmd(cmdline)
self.__json_send(cmd)
resp = self.__json_read()
if resp == None:
return
elif resp.has_key('error'):
return resp['error']
else:
return resp['return']
def __build_cmd(self, cmdline):
cmdargs = cmdline.split()
qmpcmd = { 'execute': cmdargs[0], 'arguments': {} }
for arg in cmdargs[1:]:
opt = arg.split('=')
try:
value = int(opt[1])
except ValueError:
value = opt[1]
qmpcmd['arguments'][opt[0]] = value
return qmpcmd
def __json_send(self, cmd):
# XXX: We have to send any additional char, otherwise
# the Server won't read our input
self.sock.send(json.dumps(cmd) + ' ')
def __json_read(self):
try:
while True:
line = json.loads(self.sockfile.readline())
if not 'event' in line:
return line
except ValueError:
return
def __init__(self, filename):
self.filename = filename
self.sock = socket.socket(socket.AF_UNIX, socket.SOCK_STREAM)
self.sockfile = self.sock.makefile()
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