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cedebdacd2
This is a very simple shell written in Python for demonstration
purposes.
Unfortunately it's a bit awkward right now, as the user has
to specify the arguments names and the printed data can be
a raw dictionary or list, like the following example:
(QEMU) pci_add pci_addr=auto type=nic
{u'slot': 5, u'bus': 0, u'domain': 0, u'function': 0}
(QEMU)
It's worth to note that the shell is broken into two files.
One is the shell itself, the other is the QMP class which
handles the communication with QEMU.
Signed-off-by: Luiz Capitulino <lcapitulino@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
73 lines
1.9 KiB
Python
73 lines
1.9 KiB
Python
# QEMU Monitor Protocol Python class
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#
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# Copyright (C) 2009 Red Hat Inc.
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#
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# Authors:
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# Luiz Capitulino <lcapitulino@redhat.com>
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#
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# This work is licensed under the terms of the GNU GPL, version 2. See
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# the COPYING file in the top-level directory.
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import socket, json
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class QMPError(Exception):
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pass
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class QMPConnectError(QMPError):
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pass
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class QEMUMonitorProtocol:
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def connect(self):
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self.sock.connect(self.filename)
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data = self.__json_read()
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if data == None:
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raise QMPConnectError
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if not data.has_key('QMP'):
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raise QMPConnectError
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return data['QMP']['capabilities']
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def close(self):
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self.sock.close()
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def send_raw(self, line):
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self.sock.send(str(line))
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return self.__json_read()
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def send(self, cmdline):
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cmd = self.__build_cmd(cmdline)
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self.__json_send(cmd)
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resp = self.__json_read()
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if resp == None:
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return
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elif resp.has_key('error'):
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return resp['error']
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else:
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return resp['return']
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def __build_cmd(self, cmdline):
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cmdargs = cmdline.split()
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qmpcmd = { 'execute': cmdargs[0], 'arguments': {} }
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for arg in cmdargs[1:]:
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opt = arg.split('=')
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try:
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value = int(opt[1])
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except ValueError:
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value = opt[1]
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qmpcmd['arguments'][opt[0]] = value
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return qmpcmd
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def __json_send(self, cmd):
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# XXX: We have to send any additional char, otherwise
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# the Server won't read our input
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self.sock.send(json.dumps(cmd) + ' ')
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def __json_read(self):
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try:
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return json.loads(self.sock.recv(1024))
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except ValueError:
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return
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def __init__(self, filename):
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self.filename = filename
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self.sock = socket.socket(socket.AF_UNIX, socket.SOCK_STREAM)
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