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Annotation of qemu/QMP/qmp.py, revision 1.1.1.1

1.1       root        1: # QEMU Monitor Protocol Python class
                      2: # 
                      3: # Copyright (C) 2009 Red Hat Inc.
                      4: #
                      5: # Authors:
                      6: #  Luiz Capitulino <[email protected]>
                      7: #
                      8: # This work is licensed under the terms of the GNU GPL, version 2.  See
                      9: # the COPYING file in the top-level directory.
                     10: 
                     11: import socket, json
                     12: 
                     13: class QMPError(Exception):
                     14:     pass
                     15: 
                     16: class QMPConnectError(QMPError):
                     17:     pass
                     18: 
                     19: class QEMUMonitorProtocol:
                     20:     def connect(self):
                     21:         self.sock.connect(self.filename)
                     22:         data = self.__json_read()
                     23:         if data == None:
                     24:             raise QMPConnectError
                     25:         if not data.has_key('QMP'):
                     26:             raise QMPConnectError
                     27:         return data['QMP']['capabilities']
                     28: 
                     29:     def close(self):
                     30:         self.sock.close()
                     31: 
                     32:     def send_raw(self, line):
                     33:         self.sock.send(str(line))
                     34:         return self.__json_read()
                     35: 
                     36:     def send(self, cmdline):
                     37:         cmd = self.__build_cmd(cmdline)
                     38:         self.__json_send(cmd)
                     39:         resp = self.__json_read()
                     40:         if resp == None:
                     41:             return
                     42:         elif resp.has_key('error'):
                     43:             return resp['error']
                     44:         else:
                     45:             return resp['return']
                     46: 
                     47:     def __build_cmd(self, cmdline):
                     48:         cmdargs = cmdline.split()
                     49:         qmpcmd = { 'execute': cmdargs[0], 'arguments': {} }
                     50:         for arg in cmdargs[1:]:
                     51:             opt = arg.split('=')
                     52:             try:
                     53:                 value = int(opt[1])
                     54:             except ValueError:
                     55:                 value = opt[1]
                     56:             qmpcmd['arguments'][opt[0]] = value
                     57:         return qmpcmd
                     58: 
                     59:     def __json_send(self, cmd):
                     60:         # XXX: We have to send any additional char, otherwise
                     61:         # the Server won't read our input
                     62:         self.sock.send(json.dumps(cmd) + ' ')
                     63: 
                     64:     def __json_read(self):
                     65:         try:
                     66:             return json.loads(self.sock.recv(1024))
                     67:         except ValueError:
                     68:             return
                     69: 
                     70:     def __init__(self, filename):
                     71:         self.filename = filename
                     72:         self.sock = socket.socket(socket.AF_UNIX, socket.SOCK_STREAM)

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