root / lib / hypervisor / hv_kvm / monitor.py @ d9982f38
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1 | 904d32bc | Dimitris Aragiorgis | #
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2 | 904d32bc | Dimitris Aragiorgis | #
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3 | 904d32bc | Dimitris Aragiorgis | |
4 | 904d32bc | Dimitris Aragiorgis | # Copyright (C) 2014 Google Inc.
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5 | 904d32bc | Dimitris Aragiorgis | # All rights reserved.
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6 | 904d32bc | Dimitris Aragiorgis | #
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7 | 904d32bc | Dimitris Aragiorgis | # Redistribution and use in source and binary forms, with or without
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8 | 904d32bc | Dimitris Aragiorgis | # modification, are permitted provided that the following conditions are
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9 | 904d32bc | Dimitris Aragiorgis | # met:
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10 | 904d32bc | Dimitris Aragiorgis | #
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11 | 904d32bc | Dimitris Aragiorgis | # 1. Redistributions of source code must retain the above copyright notice,
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12 | 904d32bc | Dimitris Aragiorgis | # this list of conditions and the following disclaimer.
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13 | 904d32bc | Dimitris Aragiorgis | #
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14 | 904d32bc | Dimitris Aragiorgis | # 2. Redistributions in binary form must reproduce the above copyright
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15 | 904d32bc | Dimitris Aragiorgis | # notice, this list of conditions and the following disclaimer in the
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16 | 904d32bc | Dimitris Aragiorgis | # documentation and/or other materials provided with the distribution.
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17 | 904d32bc | Dimitris Aragiorgis | #
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18 | 904d32bc | Dimitris Aragiorgis | # THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
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19 | 904d32bc | Dimitris Aragiorgis | # IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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20 | 904d32bc | Dimitris Aragiorgis | # TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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21 | 904d32bc | Dimitris Aragiorgis | # PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
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22 | 904d32bc | Dimitris Aragiorgis | # CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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23 | 904d32bc | Dimitris Aragiorgis | # EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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24 | 904d32bc | Dimitris Aragiorgis | # PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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25 | 904d32bc | Dimitris Aragiorgis | # PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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26 | 904d32bc | Dimitris Aragiorgis | # LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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27 | 904d32bc | Dimitris Aragiorgis | # NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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28 | 904d32bc | Dimitris Aragiorgis | # SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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29 | 904d32bc | Dimitris Aragiorgis | |
30 | 904d32bc | Dimitris Aragiorgis | |
31 | 904d32bc | Dimitris Aragiorgis | """Qemu monitor control classes
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32 | 904d32bc | Dimitris Aragiorgis |
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33 | 904d32bc | Dimitris Aragiorgis | """
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34 | 904d32bc | Dimitris Aragiorgis | |
35 | 904d32bc | Dimitris Aragiorgis | import os |
36 | 904d32bc | Dimitris Aragiorgis | import stat |
37 | 904d32bc | Dimitris Aragiorgis | import errno |
38 | 904d32bc | Dimitris Aragiorgis | import socket |
39 | 904d32bc | Dimitris Aragiorgis | import StringIO |
40 | 655188a2 | Dimitris Aragiorgis | import logging |
41 | 655188a2 | Dimitris Aragiorgis | try:
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42 | 655188a2 | Dimitris Aragiorgis | import fdsend # pylint: disable=F0401 |
43 | 655188a2 | Dimitris Aragiorgis | except ImportError: |
44 | 655188a2 | Dimitris Aragiorgis | fdsend = None
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45 | 904d32bc | Dimitris Aragiorgis | |
46 | 565fa7f1 | Dimitris Aragiorgis | from bitarray import bitarray |
47 | 565fa7f1 | Dimitris Aragiorgis | |
48 | 904d32bc | Dimitris Aragiorgis | from ganeti import errors |
49 | 904d32bc | Dimitris Aragiorgis | from ganeti import utils |
50 | 904d32bc | Dimitris Aragiorgis | from ganeti import serializer |
51 | 904d32bc | Dimitris Aragiorgis | |
52 | 904d32bc | Dimitris Aragiorgis | |
53 | 6c464d30 | Apollon Oikonomopoulos | class QmpCommandNotSupported(errors.HypervisorError): |
54 | 6c464d30 | Apollon Oikonomopoulos | """QMP command not supported by the monitor.
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55 | 6c464d30 | Apollon Oikonomopoulos |
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56 | 6c464d30 | Apollon Oikonomopoulos | This is raised in case a QmpMonitor instance is asked to execute a command
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57 | 6c464d30 | Apollon Oikonomopoulos | not supported by the instance.
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58 | 6c464d30 | Apollon Oikonomopoulos |
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59 | 6c464d30 | Apollon Oikonomopoulos | This is a KVM-specific exception, intended to assist in falling back to using
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60 | 6c464d30 | Apollon Oikonomopoulos | the human monitor for operations QMP does not support.
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61 | 6c464d30 | Apollon Oikonomopoulos |
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62 | 6c464d30 | Apollon Oikonomopoulos | """
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63 | 6c464d30 | Apollon Oikonomopoulos | pass
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64 | 6c464d30 | Apollon Oikonomopoulos | |
65 | 6c464d30 | Apollon Oikonomopoulos | |
66 | 8acd00fc | Apollon Oikonomopoulos | class QmpMessage(object): |
67 | 904d32bc | Dimitris Aragiorgis | """QEMU Messaging Protocol (QMP) message.
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68 | 904d32bc | Dimitris Aragiorgis |
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69 | 904d32bc | Dimitris Aragiorgis | """
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70 | 904d32bc | Dimitris Aragiorgis | def __init__(self, data): |
71 | 904d32bc | Dimitris Aragiorgis | """Creates a new QMP message based on the passed data.
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72 | 904d32bc | Dimitris Aragiorgis |
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73 | 904d32bc | Dimitris Aragiorgis | """
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74 | 904d32bc | Dimitris Aragiorgis | if not isinstance(data, dict): |
75 | 904d32bc | Dimitris Aragiorgis | raise TypeError("QmpMessage must be initialized with a dict") |
76 | 904d32bc | Dimitris Aragiorgis | |
77 | 904d32bc | Dimitris Aragiorgis | self.data = data
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78 | 904d32bc | Dimitris Aragiorgis | |
79 | 904d32bc | Dimitris Aragiorgis | def __getitem__(self, field_name): |
80 | 904d32bc | Dimitris Aragiorgis | """Get the value of the required field if present, or None.
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81 | 904d32bc | Dimitris Aragiorgis |
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82 | 904d32bc | Dimitris Aragiorgis | Overrides the [] operator to provide access to the message data,
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83 | 904d32bc | Dimitris Aragiorgis | returning None if the required item is not in the message
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84 | 904d32bc | Dimitris Aragiorgis | @return: the value of the field_name field, or None if field_name
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85 | 904d32bc | Dimitris Aragiorgis | is not contained in the message
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86 | 904d32bc | Dimitris Aragiorgis |
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87 | 904d32bc | Dimitris Aragiorgis | """
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88 | 904d32bc | Dimitris Aragiorgis | return self.data.get(field_name, None) |
89 | 904d32bc | Dimitris Aragiorgis | |
90 | 904d32bc | Dimitris Aragiorgis | def __setitem__(self, field_name, field_value): |
91 | 904d32bc | Dimitris Aragiorgis | """Set the value of the required field_name to field_value.
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92 | 904d32bc | Dimitris Aragiorgis |
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93 | 904d32bc | Dimitris Aragiorgis | """
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94 | 904d32bc | Dimitris Aragiorgis | self.data[field_name] = field_value
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95 | 904d32bc | Dimitris Aragiorgis | |
96 | 904d32bc | Dimitris Aragiorgis | def __len__(self): |
97 | 904d32bc | Dimitris Aragiorgis | """Return the number of fields stored in this QmpMessage.
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98 | 904d32bc | Dimitris Aragiorgis |
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99 | 904d32bc | Dimitris Aragiorgis | """
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100 | 904d32bc | Dimitris Aragiorgis | return len(self.data) |
101 | 904d32bc | Dimitris Aragiorgis | |
102 | 904d32bc | Dimitris Aragiorgis | def __delitem__(self, key): |
103 | 904d32bc | Dimitris Aragiorgis | """Delete the specified element from the QmpMessage.
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104 | 904d32bc | Dimitris Aragiorgis |
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105 | 904d32bc | Dimitris Aragiorgis | """
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106 | 904d32bc | Dimitris Aragiorgis | del(self.data[key]) |
107 | 904d32bc | Dimitris Aragiorgis | |
108 | 904d32bc | Dimitris Aragiorgis | @staticmethod
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109 | 904d32bc | Dimitris Aragiorgis | def BuildFromJsonString(json_string): |
110 | 904d32bc | Dimitris Aragiorgis | """Build a QmpMessage from a JSON encoded string.
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111 | 904d32bc | Dimitris Aragiorgis |
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112 | 904d32bc | Dimitris Aragiorgis | @type json_string: str
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113 | 904d32bc | Dimitris Aragiorgis | @param json_string: JSON string representing the message
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114 | 904d32bc | Dimitris Aragiorgis | @rtype: L{QmpMessage}
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115 | 904d32bc | Dimitris Aragiorgis | @return: a L{QmpMessage} built from json_string
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116 | 904d32bc | Dimitris Aragiorgis |
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117 | 904d32bc | Dimitris Aragiorgis | """
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118 | 904d32bc | Dimitris Aragiorgis | # Parse the string
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119 | 904d32bc | Dimitris Aragiorgis | data = serializer.LoadJson(json_string) |
120 | 904d32bc | Dimitris Aragiorgis | return QmpMessage(data)
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121 | 904d32bc | Dimitris Aragiorgis | |
122 | 904d32bc | Dimitris Aragiorgis | def __str__(self): |
123 | 904d32bc | Dimitris Aragiorgis | # The protocol expects the JSON object to be sent as a single line.
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124 | 904d32bc | Dimitris Aragiorgis | return serializer.DumpJson(self.data) |
125 | 904d32bc | Dimitris Aragiorgis | |
126 | 904d32bc | Dimitris Aragiorgis | def __eq__(self, other): |
127 | 904d32bc | Dimitris Aragiorgis | # When comparing two QmpMessages, we are interested in comparing
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128 | 904d32bc | Dimitris Aragiorgis | # their internal representation of the message data
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129 | 904d32bc | Dimitris Aragiorgis | return self.data == other.data |
130 | 904d32bc | Dimitris Aragiorgis | |
131 | 904d32bc | Dimitris Aragiorgis | |
132 | 904d32bc | Dimitris Aragiorgis | class MonitorSocket(object): |
133 | 904d32bc | Dimitris Aragiorgis | _SOCKET_TIMEOUT = 5
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134 | 904d32bc | Dimitris Aragiorgis | |
135 | 904d32bc | Dimitris Aragiorgis | def __init__(self, monitor_filename): |
136 | 904d32bc | Dimitris Aragiorgis | """Instantiates the MonitorSocket object.
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137 | 904d32bc | Dimitris Aragiorgis |
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138 | 904d32bc | Dimitris Aragiorgis | @type monitor_filename: string
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139 | 904d32bc | Dimitris Aragiorgis | @param monitor_filename: the filename of the UNIX raw socket on which the
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140 | 904d32bc | Dimitris Aragiorgis | monitor (QMP or simple one) is listening
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141 | 904d32bc | Dimitris Aragiorgis |
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142 | 904d32bc | Dimitris Aragiorgis | """
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143 | 904d32bc | Dimitris Aragiorgis | self.monitor_filename = monitor_filename
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144 | 904d32bc | Dimitris Aragiorgis | self._connected = False |
145 | 904d32bc | Dimitris Aragiorgis | |
146 | 904d32bc | Dimitris Aragiorgis | def _check_socket(self): |
147 | 904d32bc | Dimitris Aragiorgis | sock_stat = None
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148 | 904d32bc | Dimitris Aragiorgis | try:
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149 | 904d32bc | Dimitris Aragiorgis | sock_stat = os.stat(self.monitor_filename)
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150 | 904d32bc | Dimitris Aragiorgis | except EnvironmentError, err: |
151 | 904d32bc | Dimitris Aragiorgis | if err.errno == errno.ENOENT:
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152 | 904d32bc | Dimitris Aragiorgis | raise errors.HypervisorError("No monitor socket found") |
153 | 904d32bc | Dimitris Aragiorgis | else:
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154 | 904d32bc | Dimitris Aragiorgis | raise errors.HypervisorError("Error checking monitor socket: %s", |
155 | 904d32bc | Dimitris Aragiorgis | utils.ErrnoOrStr(err)) |
156 | 904d32bc | Dimitris Aragiorgis | if not stat.S_ISSOCK(sock_stat.st_mode): |
157 | 904d32bc | Dimitris Aragiorgis | raise errors.HypervisorError("Monitor socket is not a socket") |
158 | 904d32bc | Dimitris Aragiorgis | |
159 | 904d32bc | Dimitris Aragiorgis | def _check_connection(self): |
160 | 904d32bc | Dimitris Aragiorgis | """Make sure that the connection is established.
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161 | 904d32bc | Dimitris Aragiorgis |
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162 | 904d32bc | Dimitris Aragiorgis | """
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163 | 904d32bc | Dimitris Aragiorgis | if not self._connected: |
164 | 904d32bc | Dimitris Aragiorgis | raise errors.ProgrammerError("To use a MonitorSocket you need to first" |
165 | 904d32bc | Dimitris Aragiorgis | " invoke connect() on it")
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166 | 904d32bc | Dimitris Aragiorgis | |
167 | 904d32bc | Dimitris Aragiorgis | def connect(self): |
168 | fcad5eb4 | Dimitris Aragiorgis | """Connect to the monitor socket if not already connected.
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169 | fcad5eb4 | Dimitris Aragiorgis |
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170 | fcad5eb4 | Dimitris Aragiorgis | """
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171 | fcad5eb4 | Dimitris Aragiorgis | if not self._connected: |
172 | fcad5eb4 | Dimitris Aragiorgis | self._connect()
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173 | fcad5eb4 | Dimitris Aragiorgis | |
174 | d9982f38 | Dimitris Aragiorgis | def is_connected(self): |
175 | d9982f38 | Dimitris Aragiorgis | """Return whether there is a connection to the socket or not.
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176 | d9982f38 | Dimitris Aragiorgis |
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177 | d9982f38 | Dimitris Aragiorgis | """
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178 | d9982f38 | Dimitris Aragiorgis | return self._connected |
179 | d9982f38 | Dimitris Aragiorgis | |
180 | fcad5eb4 | Dimitris Aragiorgis | def _connect(self): |
181 | 904d32bc | Dimitris Aragiorgis | """Connects to the monitor.
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182 | 904d32bc | Dimitris Aragiorgis |
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183 | 904d32bc | Dimitris Aragiorgis | Connects to the UNIX socket
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184 | 904d32bc | Dimitris Aragiorgis |
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185 | 904d32bc | Dimitris Aragiorgis | @raise errors.HypervisorError: when there are communication errors
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186 | 904d32bc | Dimitris Aragiorgis |
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187 | 904d32bc | Dimitris Aragiorgis | """
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188 | 904d32bc | Dimitris Aragiorgis | if self._connected: |
189 | 904d32bc | Dimitris Aragiorgis | raise errors.ProgrammerError("Cannot connect twice") |
190 | 904d32bc | Dimitris Aragiorgis | |
191 | 904d32bc | Dimitris Aragiorgis | self._check_socket()
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192 | 904d32bc | Dimitris Aragiorgis | |
193 | 904d32bc | Dimitris Aragiorgis | # Check file existance/stuff
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194 | 904d32bc | Dimitris Aragiorgis | try:
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195 | fcad5eb4 | Dimitris Aragiorgis | self.sock = socket.socket(socket.AF_UNIX, socket.SOCK_STREAM)
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196 | fcad5eb4 | Dimitris Aragiorgis | # We want to fail if the server doesn't send a complete message
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197 | fcad5eb4 | Dimitris Aragiorgis | # in a reasonable amount of time
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198 | fcad5eb4 | Dimitris Aragiorgis | self.sock.settimeout(self._SOCKET_TIMEOUT) |
199 | 904d32bc | Dimitris Aragiorgis | self.sock.connect(self.monitor_filename) |
200 | 904d32bc | Dimitris Aragiorgis | except EnvironmentError: |
201 | 904d32bc | Dimitris Aragiorgis | raise errors.HypervisorError("Can't connect to qmp socket") |
202 | 904d32bc | Dimitris Aragiorgis | self._connected = True |
203 | 904d32bc | Dimitris Aragiorgis | |
204 | 904d32bc | Dimitris Aragiorgis | def close(self): |
205 | 904d32bc | Dimitris Aragiorgis | """Closes the socket
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206 | 904d32bc | Dimitris Aragiorgis |
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207 | 904d32bc | Dimitris Aragiorgis | It cannot be used after this call.
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208 | 904d32bc | Dimitris Aragiorgis |
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209 | 904d32bc | Dimitris Aragiorgis | """
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210 | d36a401b | Dimitris Aragiorgis | if self._connected: |
211 | d36a401b | Dimitris Aragiorgis | self._close()
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212 | d36a401b | Dimitris Aragiorgis | |
213 | d36a401b | Dimitris Aragiorgis | def _close(self): |
214 | 904d32bc | Dimitris Aragiorgis | self.sock.close()
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215 | fcad5eb4 | Dimitris Aragiorgis | self._connected = False |
216 | 904d32bc | Dimitris Aragiorgis | |
217 | 904d32bc | Dimitris Aragiorgis | |
218 | d9982f38 | Dimitris Aragiorgis | def _ensure_connection(fn): |
219 | d9982f38 | Dimitris Aragiorgis | """Decorator that wraps MonitorSocket external methods"""
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220 | d9982f38 | Dimitris Aragiorgis | def wrapper(*args, **kwargs): |
221 | d9982f38 | Dimitris Aragiorgis | """Ensure proper connect/close and exception propagation"""
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222 | d9982f38 | Dimitris Aragiorgis | mon = args[0]
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223 | d9982f38 | Dimitris Aragiorgis | already_connected = mon.is_connected() |
224 | d9982f38 | Dimitris Aragiorgis | mon.connect() |
225 | d9982f38 | Dimitris Aragiorgis | try:
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226 | d9982f38 | Dimitris Aragiorgis | ret = fn(*args, **kwargs) |
227 | d9982f38 | Dimitris Aragiorgis | finally:
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228 | d9982f38 | Dimitris Aragiorgis | # In general this decorator wraps external methods.
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229 | d9982f38 | Dimitris Aragiorgis | # Here we close the connection only if we initiated it before,
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230 | d9982f38 | Dimitris Aragiorgis | # to protect us from using the socket after closing it
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231 | d9982f38 | Dimitris Aragiorgis | # in case we invoke a decorated method internally by accident.
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232 | d9982f38 | Dimitris Aragiorgis | if not already_connected: |
233 | d9982f38 | Dimitris Aragiorgis | mon.close() |
234 | d9982f38 | Dimitris Aragiorgis | return ret
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235 | d9982f38 | Dimitris Aragiorgis | return wrapper
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236 | d9982f38 | Dimitris Aragiorgis | |
237 | d9982f38 | Dimitris Aragiorgis | |
238 | 904d32bc | Dimitris Aragiorgis | class QmpConnection(MonitorSocket): |
239 | 904d32bc | Dimitris Aragiorgis | """Connection to the QEMU Monitor using the QEMU Monitor Protocol (QMP).
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240 | 904d32bc | Dimitris Aragiorgis |
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241 | 904d32bc | Dimitris Aragiorgis | """
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242 | 904d32bc | Dimitris Aragiorgis | _FIRST_MESSAGE_KEY = "QMP"
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243 | 904d32bc | Dimitris Aragiorgis | _EVENT_KEY = "event"
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244 | 904d32bc | Dimitris Aragiorgis | _ERROR_KEY = "error"
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245 | 546cdf7a | Apollon Oikonomopoulos | _RETURN_KEY = "return"
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246 | 904d32bc | Dimitris Aragiorgis | _ACTUAL_KEY = ACTUAL_KEY = "actual"
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247 | 904d32bc | Dimitris Aragiorgis | _ERROR_CLASS_KEY = "class"
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248 | 904d32bc | Dimitris Aragiorgis | _ERROR_DESC_KEY = "desc"
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249 | 904d32bc | Dimitris Aragiorgis | _EXECUTE_KEY = "execute"
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250 | 904d32bc | Dimitris Aragiorgis | _ARGUMENTS_KEY = "arguments"
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251 | 7b648a55 | Apollon Oikonomopoulos | _VERSION_KEY = "version"
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252 | 7b648a55 | Apollon Oikonomopoulos | _PACKAGE_KEY = "package"
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253 | 7b648a55 | Apollon Oikonomopoulos | _QEMU_KEY = "qemu"
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254 | 904d32bc | Dimitris Aragiorgis | _CAPABILITIES_COMMAND = "qmp_capabilities"
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255 | 9b7ef3eb | Apollon Oikonomopoulos | _QUERY_COMMANDS = "query-commands"
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256 | 904d32bc | Dimitris Aragiorgis | _MESSAGE_END_TOKEN = "\r\n"
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257 | 565fa7f1 | Dimitris Aragiorgis | _QEMU_PCI_SLOTS = 32 # The number of PCI slots QEMU exposes by default |
258 | 904d32bc | Dimitris Aragiorgis | |
259 | 904d32bc | Dimitris Aragiorgis | def __init__(self, monitor_filename): |
260 | 904d32bc | Dimitris Aragiorgis | super(QmpConnection, self).__init__(monitor_filename) |
261 | 904d32bc | Dimitris Aragiorgis | self._buf = "" |
262 | 6c464d30 | Apollon Oikonomopoulos | self.supported_commands = None |
263 | 904d32bc | Dimitris Aragiorgis | |
264 | 13bb1b4c | Apollon Oikonomopoulos | def __enter__(self): |
265 | 13bb1b4c | Apollon Oikonomopoulos | self.connect()
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266 | 13bb1b4c | Apollon Oikonomopoulos | return self |
267 | 13bb1b4c | Apollon Oikonomopoulos | |
268 | 13bb1b4c | Apollon Oikonomopoulos | def __exit__(self, exc_type, exc_value, tb): |
269 | 13bb1b4c | Apollon Oikonomopoulos | self.close()
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270 | 13bb1b4c | Apollon Oikonomopoulos | |
271 | 904d32bc | Dimitris Aragiorgis | def connect(self): |
272 | 904d32bc | Dimitris Aragiorgis | """Connects to the QMP monitor.
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273 | 904d32bc | Dimitris Aragiorgis |
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274 | 904d32bc | Dimitris Aragiorgis | Connects to the UNIX socket and makes sure that we can actually send and
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275 | 904d32bc | Dimitris Aragiorgis | receive data to the kvm instance via QMP.
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276 | 904d32bc | Dimitris Aragiorgis |
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277 | 904d32bc | Dimitris Aragiorgis | @raise errors.HypervisorError: when there are communication errors
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278 | 904d32bc | Dimitris Aragiorgis | @raise errors.ProgrammerError: when there are data serialization errors
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279 | 904d32bc | Dimitris Aragiorgis |
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280 | 904d32bc | Dimitris Aragiorgis | """
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281 | 904d32bc | Dimitris Aragiorgis | super(QmpConnection, self).connect() |
282 | 904d32bc | Dimitris Aragiorgis | # Check if we receive a correct greeting message from the server
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283 | 904d32bc | Dimitris Aragiorgis | # (As per the QEMU Protocol Specification 0.1 - section 2.2)
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284 | 904d32bc | Dimitris Aragiorgis | greeting = self._Recv()
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285 | 904d32bc | Dimitris Aragiorgis | if not greeting[self._FIRST_MESSAGE_KEY]: |
286 | 904d32bc | Dimitris Aragiorgis | self._connected = False |
287 | 904d32bc | Dimitris Aragiorgis | raise errors.HypervisorError("kvm: QMP communication error (wrong" |
288 | 904d32bc | Dimitris Aragiorgis | " server greeting")
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289 | 904d32bc | Dimitris Aragiorgis | |
290 | 7b648a55 | Apollon Oikonomopoulos | # Extract the version info from the greeting and make it available to users
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291 | 7b648a55 | Apollon Oikonomopoulos | # of the monitor.
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292 | 7b648a55 | Apollon Oikonomopoulos | version_info = greeting[self._FIRST_MESSAGE_KEY][self._VERSION_KEY] |
293 | 7b648a55 | Apollon Oikonomopoulos | |
294 | 7b648a55 | Apollon Oikonomopoulos | self.version = (version_info[self._QEMU_KEY]["major"], |
295 | 7b648a55 | Apollon Oikonomopoulos | version_info[self._QEMU_KEY]["minor"], |
296 | 7b648a55 | Apollon Oikonomopoulos | version_info[self._QEMU_KEY]["micro"]) |
297 | 7b648a55 | Apollon Oikonomopoulos | self.package = version_info[self._PACKAGE_KEY].strip() |
298 | 7b648a55 | Apollon Oikonomopoulos | |
299 | 904d32bc | Dimitris Aragiorgis | # This is needed because QMP can return more than one greetings
|
300 | 904d32bc | Dimitris Aragiorgis | # see https://groups.google.com/d/msg/ganeti-devel/gZYcvHKDooU/SnukC8dgS5AJ
|
301 | 904d32bc | Dimitris Aragiorgis | self._buf = "" |
302 | 904d32bc | Dimitris Aragiorgis | |
303 | 904d32bc | Dimitris Aragiorgis | # Let's put the monitor in command mode using the qmp_capabilities
|
304 | 904d32bc | Dimitris Aragiorgis | # command, or else no command will be executable.
|
305 | 904d32bc | Dimitris Aragiorgis | # (As per the QEMU Protocol Specification 0.1 - section 4)
|
306 | 904d32bc | Dimitris Aragiorgis | self.Execute(self._CAPABILITIES_COMMAND) |
307 | 9b7ef3eb | Apollon Oikonomopoulos | self.supported_commands = self._GetSupportedCommands() |
308 | 904d32bc | Dimitris Aragiorgis | |
309 | 904d32bc | Dimitris Aragiorgis | def _ParseMessage(self, buf): |
310 | 904d32bc | Dimitris Aragiorgis | """Extract and parse a QMP message from the given buffer.
|
311 | 904d32bc | Dimitris Aragiorgis |
|
312 | 904d32bc | Dimitris Aragiorgis | Seeks for a QMP message in the given buf. If found, it parses it and
|
313 | 904d32bc | Dimitris Aragiorgis | returns it together with the rest of the characters in the buf.
|
314 | 904d32bc | Dimitris Aragiorgis | If no message is found, returns None and the whole buffer.
|
315 | 904d32bc | Dimitris Aragiorgis |
|
316 | 904d32bc | Dimitris Aragiorgis | @raise errors.ProgrammerError: when there are data serialization errors
|
317 | 904d32bc | Dimitris Aragiorgis |
|
318 | 904d32bc | Dimitris Aragiorgis | """
|
319 | 904d32bc | Dimitris Aragiorgis | message = None
|
320 | 904d32bc | Dimitris Aragiorgis | # Check if we got the message end token (CRLF, as per the QEMU Protocol
|
321 | 904d32bc | Dimitris Aragiorgis | # Specification 0.1 - Section 2.1.1)
|
322 | 904d32bc | Dimitris Aragiorgis | pos = buf.find(self._MESSAGE_END_TOKEN)
|
323 | 904d32bc | Dimitris Aragiorgis | if pos >= 0: |
324 | 904d32bc | Dimitris Aragiorgis | try:
|
325 | 904d32bc | Dimitris Aragiorgis | message = QmpMessage.BuildFromJsonString(buf[:pos + 1])
|
326 | 904d32bc | Dimitris Aragiorgis | except Exception, err: |
327 | 904d32bc | Dimitris Aragiorgis | raise errors.ProgrammerError("QMP data serialization error: %s" % err) |
328 | 904d32bc | Dimitris Aragiorgis | buf = buf[pos + 1:]
|
329 | 904d32bc | Dimitris Aragiorgis | |
330 | 904d32bc | Dimitris Aragiorgis | return (message, buf)
|
331 | 904d32bc | Dimitris Aragiorgis | |
332 | 904d32bc | Dimitris Aragiorgis | def _Recv(self): |
333 | 904d32bc | Dimitris Aragiorgis | """Receives a message from QMP and decodes the received JSON object.
|
334 | 904d32bc | Dimitris Aragiorgis |
|
335 | 904d32bc | Dimitris Aragiorgis | @rtype: QmpMessage
|
336 | 904d32bc | Dimitris Aragiorgis | @return: the received message
|
337 | 904d32bc | Dimitris Aragiorgis | @raise errors.HypervisorError: when there are communication errors
|
338 | 904d32bc | Dimitris Aragiorgis | @raise errors.ProgrammerError: when there are data serialization errors
|
339 | 904d32bc | Dimitris Aragiorgis |
|
340 | 904d32bc | Dimitris Aragiorgis | """
|
341 | 904d32bc | Dimitris Aragiorgis | self._check_connection()
|
342 | 904d32bc | Dimitris Aragiorgis | |
343 | 904d32bc | Dimitris Aragiorgis | # Check if there is already a message in the buffer
|
344 | 904d32bc | Dimitris Aragiorgis | (message, self._buf) = self._ParseMessage(self._buf) |
345 | 904d32bc | Dimitris Aragiorgis | if message:
|
346 | 904d32bc | Dimitris Aragiorgis | return message
|
347 | 904d32bc | Dimitris Aragiorgis | |
348 | 904d32bc | Dimitris Aragiorgis | recv_buffer = StringIO.StringIO(self._buf)
|
349 | 904d32bc | Dimitris Aragiorgis | recv_buffer.seek(len(self._buf)) |
350 | 904d32bc | Dimitris Aragiorgis | try:
|
351 | 904d32bc | Dimitris Aragiorgis | while True: |
352 | 904d32bc | Dimitris Aragiorgis | data = self.sock.recv(4096) |
353 | 904d32bc | Dimitris Aragiorgis | if not data: |
354 | 904d32bc | Dimitris Aragiorgis | break
|
355 | 904d32bc | Dimitris Aragiorgis | recv_buffer.write(data) |
356 | 904d32bc | Dimitris Aragiorgis | |
357 | 904d32bc | Dimitris Aragiorgis | (message, self._buf) = self._ParseMessage(recv_buffer.getvalue()) |
358 | 904d32bc | Dimitris Aragiorgis | if message:
|
359 | 904d32bc | Dimitris Aragiorgis | return message
|
360 | 904d32bc | Dimitris Aragiorgis | |
361 | 904d32bc | Dimitris Aragiorgis | except socket.timeout, err:
|
362 | 904d32bc | Dimitris Aragiorgis | raise errors.HypervisorError("Timeout while receiving a QMP message: " |
363 | 904d32bc | Dimitris Aragiorgis | "%s" % (err))
|
364 | 904d32bc | Dimitris Aragiorgis | except socket.error, err:
|
365 | 904d32bc | Dimitris Aragiorgis | raise errors.HypervisorError("Unable to receive data from KVM using the" |
366 | 904d32bc | Dimitris Aragiorgis | " QMP protocol: %s" % err)
|
367 | 904d32bc | Dimitris Aragiorgis | |
368 | 904d32bc | Dimitris Aragiorgis | def _Send(self, message): |
369 | 904d32bc | Dimitris Aragiorgis | """Encodes and sends a message to KVM using QMP.
|
370 | 904d32bc | Dimitris Aragiorgis |
|
371 | 904d32bc | Dimitris Aragiorgis | @type message: QmpMessage
|
372 | 904d32bc | Dimitris Aragiorgis | @param message: message to send to KVM
|
373 | 904d32bc | Dimitris Aragiorgis | @raise errors.HypervisorError: when there are communication errors
|
374 | 904d32bc | Dimitris Aragiorgis | @raise errors.ProgrammerError: when there are data serialization errors
|
375 | 904d32bc | Dimitris Aragiorgis |
|
376 | 904d32bc | Dimitris Aragiorgis | """
|
377 | 904d32bc | Dimitris Aragiorgis | self._check_connection()
|
378 | 904d32bc | Dimitris Aragiorgis | try:
|
379 | 904d32bc | Dimitris Aragiorgis | message_str = str(message)
|
380 | 904d32bc | Dimitris Aragiorgis | except Exception, err: |
381 | 904d32bc | Dimitris Aragiorgis | raise errors.ProgrammerError("QMP data deserialization error: %s" % err) |
382 | 904d32bc | Dimitris Aragiorgis | |
383 | 904d32bc | Dimitris Aragiorgis | try:
|
384 | 904d32bc | Dimitris Aragiorgis | self.sock.sendall(message_str)
|
385 | 904d32bc | Dimitris Aragiorgis | except socket.timeout, err:
|
386 | 904d32bc | Dimitris Aragiorgis | raise errors.HypervisorError("Timeout while sending a QMP message: " |
387 | 904d32bc | Dimitris Aragiorgis | "%s (%s)" % (err.string, err.errno))
|
388 | 904d32bc | Dimitris Aragiorgis | except socket.error, err:
|
389 | 904d32bc | Dimitris Aragiorgis | raise errors.HypervisorError("Unable to send data from KVM using the" |
390 | 904d32bc | Dimitris Aragiorgis | " QMP protocol: %s" % err)
|
391 | 904d32bc | Dimitris Aragiorgis | |
392 | 9b7ef3eb | Apollon Oikonomopoulos | def _GetSupportedCommands(self): |
393 | 9b7ef3eb | Apollon Oikonomopoulos | """Update the list of supported commands.
|
394 | 9b7ef3eb | Apollon Oikonomopoulos |
|
395 | 9b7ef3eb | Apollon Oikonomopoulos | """
|
396 | 9b7ef3eb | Apollon Oikonomopoulos | result = self.Execute(self._QUERY_COMMANDS) |
397 | 546cdf7a | Apollon Oikonomopoulos | return frozenset(com["name"] for com in result) |
398 | 9b7ef3eb | Apollon Oikonomopoulos | |
399 | 904d32bc | Dimitris Aragiorgis | def Execute(self, command, arguments=None): |
400 | 904d32bc | Dimitris Aragiorgis | """Executes a QMP command and returns the response of the server.
|
401 | 904d32bc | Dimitris Aragiorgis |
|
402 | 904d32bc | Dimitris Aragiorgis | @type command: str
|
403 | 904d32bc | Dimitris Aragiorgis | @param command: the command to execute
|
404 | 904d32bc | Dimitris Aragiorgis | @type arguments: dict
|
405 | 904d32bc | Dimitris Aragiorgis | @param arguments: dictionary of arguments to be passed to the command
|
406 | 904d32bc | Dimitris Aragiorgis | @rtype: dict
|
407 | 904d32bc | Dimitris Aragiorgis | @return: dictionary representing the received JSON object
|
408 | 904d32bc | Dimitris Aragiorgis | @raise errors.HypervisorError: when there are communication errors
|
409 | 904d32bc | Dimitris Aragiorgis | @raise errors.ProgrammerError: when there are data serialization errors
|
410 | 904d32bc | Dimitris Aragiorgis |
|
411 | 904d32bc | Dimitris Aragiorgis | """
|
412 | 904d32bc | Dimitris Aragiorgis | self._check_connection()
|
413 | 6c464d30 | Apollon Oikonomopoulos | |
414 | 6c464d30 | Apollon Oikonomopoulos | # During the first calls of Execute, the list of supported commands has not
|
415 | 6c464d30 | Apollon Oikonomopoulos | # yet been populated, so we can't use it.
|
416 | 6c464d30 | Apollon Oikonomopoulos | if (self.supported_commands is not None and |
417 | 6c464d30 | Apollon Oikonomopoulos | command not in self.supported_commands): |
418 | 6c464d30 | Apollon Oikonomopoulos | raise QmpCommandNotSupported("Instance does not support the '%s'" |
419 | 6c464d30 | Apollon Oikonomopoulos | " QMP command." % command)
|
420 | 6c464d30 | Apollon Oikonomopoulos | |
421 | 904d32bc | Dimitris Aragiorgis | message = QmpMessage({self._EXECUTE_KEY: command})
|
422 | 904d32bc | Dimitris Aragiorgis | if arguments:
|
423 | 904d32bc | Dimitris Aragiorgis | message[self._ARGUMENTS_KEY] = arguments
|
424 | 904d32bc | Dimitris Aragiorgis | self._Send(message)
|
425 | 904d32bc | Dimitris Aragiorgis | |
426 | e31571c1 | Dimitris Aragiorgis | ret = self._GetResponse(command)
|
427 | e31571c1 | Dimitris Aragiorgis | # log important qmp commands..
|
428 | e31571c1 | Dimitris Aragiorgis | if command not in [self._QUERY_COMMANDS, self._CAPABILITIES_COMMAND]: |
429 | e31571c1 | Dimitris Aragiorgis | logging.debug("QMP %s %s: %s\n", command, arguments, ret)
|
430 | e31571c1 | Dimitris Aragiorgis | return ret
|
431 | 655188a2 | Dimitris Aragiorgis | |
432 | 655188a2 | Dimitris Aragiorgis | def _GetResponse(self, command): |
433 | 655188a2 | Dimitris Aragiorgis | """Parse the QMP response
|
434 | 655188a2 | Dimitris Aragiorgis |
|
435 | 655188a2 | Dimitris Aragiorgis | If error key found in the response message raise HypervisorError.
|
436 | 655188a2 | Dimitris Aragiorgis | Ignore any async event and thus return the response message
|
437 | 655188a2 | Dimitris Aragiorgis | related to command.
|
438 | 655188a2 | Dimitris Aragiorgis |
|
439 | 655188a2 | Dimitris Aragiorgis | """
|
440 | 546cdf7a | Apollon Oikonomopoulos | # According the the QMP specification, there are only two reply types to a
|
441 | 546cdf7a | Apollon Oikonomopoulos | # command: either error (containing the "error" key) or success (containing
|
442 | 546cdf7a | Apollon Oikonomopoulos | # the "return" key). There is also a third possibility, that of an
|
443 | 546cdf7a | Apollon Oikonomopoulos | # (unrelated to the command) asynchronous event notification, identified by
|
444 | 546cdf7a | Apollon Oikonomopoulos | # the "event" key.
|
445 | 904d32bc | Dimitris Aragiorgis | while True: |
446 | 904d32bc | Dimitris Aragiorgis | response = self._Recv()
|
447 | 904d32bc | Dimitris Aragiorgis | err = response[self._ERROR_KEY]
|
448 | 904d32bc | Dimitris Aragiorgis | if err:
|
449 | 904d32bc | Dimitris Aragiorgis | raise errors.HypervisorError("kvm: error executing the %s" |
450 | 904d32bc | Dimitris Aragiorgis | " command: %s (%s):" %
|
451 | 904d32bc | Dimitris Aragiorgis | (command, |
452 | 904d32bc | Dimitris Aragiorgis | err[self._ERROR_DESC_KEY],
|
453 | 904d32bc | Dimitris Aragiorgis | err[self._ERROR_CLASS_KEY]))
|
454 | 904d32bc | Dimitris Aragiorgis | |
455 | 546cdf7a | Apollon Oikonomopoulos | elif response[self._EVENT_KEY]: |
456 | 546cdf7a | Apollon Oikonomopoulos | # Filter-out any asynchronous events
|
457 | 546cdf7a | Apollon Oikonomopoulos | continue
|
458 | 546cdf7a | Apollon Oikonomopoulos | |
459 | 546cdf7a | Apollon Oikonomopoulos | return response[self._RETURN_KEY] |
460 | 655188a2 | Dimitris Aragiorgis | |
461 | d9982f38 | Dimitris Aragiorgis | @_ensure_connection
|
462 | 57c24313 | Dimitris Aragiorgis | def HotAddNic(self, nic, devid, tapfds=None, vhostfds=None, features=None): |
463 | cc6a7f5f | Dimitris Aragiorgis | """Hot-add a NIC
|
464 | cc6a7f5f | Dimitris Aragiorgis |
|
465 | 57c24313 | Dimitris Aragiorgis | First pass the tapfds, then netdev_add and then device_add
|
466 | cc6a7f5f | Dimitris Aragiorgis |
|
467 | cc6a7f5f | Dimitris Aragiorgis | """
|
468 | 57c24313 | Dimitris Aragiorgis | if tapfds is None: |
469 | 57c24313 | Dimitris Aragiorgis | tapfds = [] |
470 | 57c24313 | Dimitris Aragiorgis | if vhostfds is None: |
471 | 57c24313 | Dimitris Aragiorgis | vhostfds = [] |
472 | 57c24313 | Dimitris Aragiorgis | if features is None: |
473 | 57c24313 | Dimitris Aragiorgis | features = {} |
474 | 57c24313 | Dimitris Aragiorgis | |
475 | 57c24313 | Dimitris Aragiorgis | enable_vhost = features.get("vhost", False) |
476 | 57c24313 | Dimitris Aragiorgis | enable_mq, virtio_net_queues = features.get("mq", (False, 1)) |
477 | 57c24313 | Dimitris Aragiorgis | |
478 | 57c24313 | Dimitris Aragiorgis | fdnames = [] |
479 | 57c24313 | Dimitris Aragiorgis | for i, fd in enumerate(tapfds): |
480 | 57c24313 | Dimitris Aragiorgis | fdname = "%s-%d" % (devid, i)
|
481 | d9982f38 | Dimitris Aragiorgis | self._GetFd(fd, fdname)
|
482 | 57c24313 | Dimitris Aragiorgis | fdnames.append(fdname) |
483 | cc6a7f5f | Dimitris Aragiorgis | |
484 | cc6a7f5f | Dimitris Aragiorgis | arguments = { |
485 | cc6a7f5f | Dimitris Aragiorgis | "type": "tap", |
486 | cc6a7f5f | Dimitris Aragiorgis | "id": devid,
|
487 | 57c24313 | Dimitris Aragiorgis | "fds": ":".join(fdnames), |
488 | cc6a7f5f | Dimitris Aragiorgis | } |
489 | 57c24313 | Dimitris Aragiorgis | if enable_vhost:
|
490 | 57c24313 | Dimitris Aragiorgis | fdnames = [] |
491 | 57c24313 | Dimitris Aragiorgis | for i, fd in enumerate(vhostfds): |
492 | 57c24313 | Dimitris Aragiorgis | fdname = "%s-vhost-%d" % (devid, i)
|
493 | d9982f38 | Dimitris Aragiorgis | self._GetFd(fd, fdname)
|
494 | 57c24313 | Dimitris Aragiorgis | fdnames.append(fdname) |
495 | 57c24313 | Dimitris Aragiorgis | |
496 | 57c24313 | Dimitris Aragiorgis | arguments.update({ |
497 | 57c24313 | Dimitris Aragiorgis | "vhost": "on", |
498 | 57c24313 | Dimitris Aragiorgis | "vhostfds": ":".join(fdnames), |
499 | 57c24313 | Dimitris Aragiorgis | }) |
500 | cc6a7f5f | Dimitris Aragiorgis | self.Execute("netdev_add", arguments) |
501 | cc6a7f5f | Dimitris Aragiorgis | |
502 | cc6a7f5f | Dimitris Aragiorgis | arguments = { |
503 | cc6a7f5f | Dimitris Aragiorgis | "driver": "virtio-net-pci", |
504 | cc6a7f5f | Dimitris Aragiorgis | "id": devid,
|
505 | cc6a7f5f | Dimitris Aragiorgis | "bus": "pci.0", |
506 | cc6a7f5f | Dimitris Aragiorgis | "addr": hex(nic.pci), |
507 | cc6a7f5f | Dimitris Aragiorgis | "netdev": devid,
|
508 | cc6a7f5f | Dimitris Aragiorgis | "mac": nic.mac,
|
509 | cc6a7f5f | Dimitris Aragiorgis | } |
510 | 57c24313 | Dimitris Aragiorgis | if enable_mq:
|
511 | 57c24313 | Dimitris Aragiorgis | arguments.update({ |
512 | 57c24313 | Dimitris Aragiorgis | "mq": "on", |
513 | 57c24313 | Dimitris Aragiorgis | "vectors": (2 * virtio_net_queues + 1), |
514 | 57c24313 | Dimitris Aragiorgis | }) |
515 | cc6a7f5f | Dimitris Aragiorgis | self.Execute("device_add", arguments) |
516 | cc6a7f5f | Dimitris Aragiorgis | |
517 | d9982f38 | Dimitris Aragiorgis | @_ensure_connection
|
518 | cc6a7f5f | Dimitris Aragiorgis | def HotDelNic(self, devid): |
519 | cc6a7f5f | Dimitris Aragiorgis | """Hot-del a NIC
|
520 | cc6a7f5f | Dimitris Aragiorgis |
|
521 | cc6a7f5f | Dimitris Aragiorgis | """
|
522 | cc6a7f5f | Dimitris Aragiorgis | self.Execute("device_del", {"id": devid}) |
523 | cc6a7f5f | Dimitris Aragiorgis | self.Execute("netdev_del", {"id": devid}) |
524 | cc6a7f5f | Dimitris Aragiorgis | |
525 | d9982f38 | Dimitris Aragiorgis | @_ensure_connection
|
526 | af4b620c | Dimitris Aragiorgis | def HotAddDisk(self, disk, devid, uri): |
527 | af4b620c | Dimitris Aragiorgis | """Hot-add a disk
|
528 | af4b620c | Dimitris Aragiorgis |
|
529 | af4b620c | Dimitris Aragiorgis | Try opening the device to obtain a fd and pass it with SCM_RIGHTS. This
|
530 | af4b620c | Dimitris Aragiorgis | will be omitted in case of userspace access mode (open will fail).
|
531 | af4b620c | Dimitris Aragiorgis | Then use blockdev-add and then device_add.
|
532 | af4b620c | Dimitris Aragiorgis |
|
533 | af4b620c | Dimitris Aragiorgis | """
|
534 | af4b620c | Dimitris Aragiorgis | if os.path.exists(uri):
|
535 | af4b620c | Dimitris Aragiorgis | fd = os.open(uri, os.O_RDWR) |
536 | d9982f38 | Dimitris Aragiorgis | fdset = self._AddFd(fd)
|
537 | af4b620c | Dimitris Aragiorgis | os.close(fd) |
538 | af4b620c | Dimitris Aragiorgis | filename = "/dev/fdset/%s" % fdset
|
539 | af4b620c | Dimitris Aragiorgis | else:
|
540 | af4b620c | Dimitris Aragiorgis | # The uri is not a file.
|
541 | af4b620c | Dimitris Aragiorgis | # This can happen if a userspace uri is provided.
|
542 | af4b620c | Dimitris Aragiorgis | filename = uri |
543 | af4b620c | Dimitris Aragiorgis | fdset = None
|
544 | af4b620c | Dimitris Aragiorgis | |
545 | af4b620c | Dimitris Aragiorgis | arguments = { |
546 | af4b620c | Dimitris Aragiorgis | "options": {
|
547 | af4b620c | Dimitris Aragiorgis | "driver": "raw", |
548 | af4b620c | Dimitris Aragiorgis | "id": devid,
|
549 | af4b620c | Dimitris Aragiorgis | "file": {
|
550 | af4b620c | Dimitris Aragiorgis | "driver": "file", |
551 | af4b620c | Dimitris Aragiorgis | "filename": filename,
|
552 | af4b620c | Dimitris Aragiorgis | } |
553 | af4b620c | Dimitris Aragiorgis | } |
554 | af4b620c | Dimitris Aragiorgis | } |
555 | af4b620c | Dimitris Aragiorgis | self.Execute("blockdev-add", arguments) |
556 | af4b620c | Dimitris Aragiorgis | |
557 | af4b620c | Dimitris Aragiorgis | if fdset is not None: |
558 | d9982f38 | Dimitris Aragiorgis | self._RemoveFdset(fdset)
|
559 | af4b620c | Dimitris Aragiorgis | |
560 | af4b620c | Dimitris Aragiorgis | arguments = { |
561 | af4b620c | Dimitris Aragiorgis | "driver": "virtio-blk-pci", |
562 | af4b620c | Dimitris Aragiorgis | "id": devid,
|
563 | af4b620c | Dimitris Aragiorgis | "bus": "pci.0", |
564 | af4b620c | Dimitris Aragiorgis | "addr": hex(disk.pci), |
565 | af4b620c | Dimitris Aragiorgis | "drive": devid,
|
566 | af4b620c | Dimitris Aragiorgis | } |
567 | af4b620c | Dimitris Aragiorgis | self.Execute("device_add", arguments) |
568 | af4b620c | Dimitris Aragiorgis | |
569 | d9982f38 | Dimitris Aragiorgis | @_ensure_connection
|
570 | af4b620c | Dimitris Aragiorgis | def HotDelDisk(self, devid): |
571 | af4b620c | Dimitris Aragiorgis | """Hot-del a Disk
|
572 | af4b620c | Dimitris Aragiorgis |
|
573 | af4b620c | Dimitris Aragiorgis | Note that drive_del is not supported yet in qmp and thus should
|
574 | af4b620c | Dimitris Aragiorgis | be invoked from HMP.
|
575 | af4b620c | Dimitris Aragiorgis |
|
576 | af4b620c | Dimitris Aragiorgis | """
|
577 | af4b620c | Dimitris Aragiorgis | self.Execute("device_del", {"id": devid}) |
578 | af4b620c | Dimitris Aragiorgis | #TODO: uncomment when drive_del gets implemented in upstream qemu
|
579 | af4b620c | Dimitris Aragiorgis | # self.Execute("drive_del", {"id": devid})
|
580 | af4b620c | Dimitris Aragiorgis | |
581 | d9982f38 | Dimitris Aragiorgis | def _GetPCIDevices(self): |
582 | 565fa7f1 | Dimitris Aragiorgis | """Get the devices of the first PCI bus of a running instance.
|
583 | 565fa7f1 | Dimitris Aragiorgis |
|
584 | 565fa7f1 | Dimitris Aragiorgis | """
|
585 | 565fa7f1 | Dimitris Aragiorgis | self._check_connection()
|
586 | 565fa7f1 | Dimitris Aragiorgis | pci = self.Execute("query-pci") |
587 | 565fa7f1 | Dimitris Aragiorgis | bus = pci[0]
|
588 | 565fa7f1 | Dimitris Aragiorgis | devices = bus["devices"]
|
589 | 565fa7f1 | Dimitris Aragiorgis | return devices
|
590 | 565fa7f1 | Dimitris Aragiorgis | |
591 | d9982f38 | Dimitris Aragiorgis | @_ensure_connection
|
592 | 565fa7f1 | Dimitris Aragiorgis | def HasPCIDevice(self, device, devid): |
593 | 565fa7f1 | Dimitris Aragiorgis | """Check if a specific device exists or not on a running instance.
|
594 | 565fa7f1 | Dimitris Aragiorgis |
|
595 | 565fa7f1 | Dimitris Aragiorgis | It will match the PCI slot of the device and the id currently
|
596 | 565fa7f1 | Dimitris Aragiorgis | obtained by _GenerateDeviceKVMId().
|
597 | 565fa7f1 | Dimitris Aragiorgis |
|
598 | 565fa7f1 | Dimitris Aragiorgis | """
|
599 | d9982f38 | Dimitris Aragiorgis | for d in self._GetPCIDevices(): |
600 | 565fa7f1 | Dimitris Aragiorgis | if d["qdev_id"] == devid and d["slot"] == device.pci: |
601 | 565fa7f1 | Dimitris Aragiorgis | return True |
602 | 565fa7f1 | Dimitris Aragiorgis | |
603 | 565fa7f1 | Dimitris Aragiorgis | return False |
604 | 565fa7f1 | Dimitris Aragiorgis | |
605 | d9982f38 | Dimitris Aragiorgis | @_ensure_connection
|
606 | 565fa7f1 | Dimitris Aragiorgis | def GetFreePCISlot(self): |
607 | 565fa7f1 | Dimitris Aragiorgis | """Get the first available PCI slot of a running instance.
|
608 | 565fa7f1 | Dimitris Aragiorgis |
|
609 | 565fa7f1 | Dimitris Aragiorgis | """
|
610 | 565fa7f1 | Dimitris Aragiorgis | slots = bitarray(self._QEMU_PCI_SLOTS)
|
611 | 565fa7f1 | Dimitris Aragiorgis | slots.setall(False) # pylint: disable=E1101 |
612 | d9982f38 | Dimitris Aragiorgis | for d in self._GetPCIDevices(): |
613 | 565fa7f1 | Dimitris Aragiorgis | slot = d["slot"]
|
614 | 565fa7f1 | Dimitris Aragiorgis | slots[slot] = True
|
615 | 565fa7f1 | Dimitris Aragiorgis | |
616 | 565fa7f1 | Dimitris Aragiorgis | return utils.GetFreeSlot(slots)
|
617 | 565fa7f1 | Dimitris Aragiorgis | |
618 | d9982f38 | Dimitris Aragiorgis | @_ensure_connection
|
619 | ff81c659 | Dimitris Aragiorgis | def CheckDiskHotAddSupport(self): |
620 | ff81c659 | Dimitris Aragiorgis | """Check if disk hotplug is possible
|
621 | ff81c659 | Dimitris Aragiorgis |
|
622 | ff81c659 | Dimitris Aragiorgis | Hotplug is *not* supported in case:
|
623 | ff81c659 | Dimitris Aragiorgis | - fdsend module is missing
|
624 | ff81c659 | Dimitris Aragiorgis | - add-fd and blockdev-add qmp commands are not supported
|
625 | ff81c659 | Dimitris Aragiorgis |
|
626 | ff81c659 | Dimitris Aragiorgis | """
|
627 | ff81c659 | Dimitris Aragiorgis | def _raise(reason): |
628 | ff81c659 | Dimitris Aragiorgis | raise errors.HotplugError("Cannot hot-add disk: %s." % reason) |
629 | ff81c659 | Dimitris Aragiorgis | |
630 | ff81c659 | Dimitris Aragiorgis | if not fdsend: |
631 | ff81c659 | Dimitris Aragiorgis | _raise("fdsend python module is missing")
|
632 | ff81c659 | Dimitris Aragiorgis | |
633 | ff81c659 | Dimitris Aragiorgis | if "add-fd" not in self.supported_commands: |
634 | ff81c659 | Dimitris Aragiorgis | _raise("add-fd qmp command is not supported")
|
635 | ff81c659 | Dimitris Aragiorgis | |
636 | ff81c659 | Dimitris Aragiorgis | if "blockdev-add" not in self.supported_commands: |
637 | ff81c659 | Dimitris Aragiorgis | _raise("blockdev-add qmp command is not supported")
|
638 | ff81c659 | Dimitris Aragiorgis | |
639 | d9982f38 | Dimitris Aragiorgis | @_ensure_connection
|
640 | ff81c659 | Dimitris Aragiorgis | def CheckNicHotAddSupport(self): |
641 | ff81c659 | Dimitris Aragiorgis | """Check if NIC hotplug is possible
|
642 | ff81c659 | Dimitris Aragiorgis |
|
643 | ff81c659 | Dimitris Aragiorgis | Hotplug is *not* supported in case:
|
644 | ff81c659 | Dimitris Aragiorgis | - fdsend module is missing
|
645 | ff81c659 | Dimitris Aragiorgis | - getfd and netdev_add qmp commands are not supported
|
646 | ff81c659 | Dimitris Aragiorgis |
|
647 | ff81c659 | Dimitris Aragiorgis | """
|
648 | ff81c659 | Dimitris Aragiorgis | def _raise(reason): |
649 | ff81c659 | Dimitris Aragiorgis | raise errors.HotplugError("Cannot hot-add NIC: %s." % reason) |
650 | ff81c659 | Dimitris Aragiorgis | |
651 | ff81c659 | Dimitris Aragiorgis | if not fdsend: |
652 | ff81c659 | Dimitris Aragiorgis | _raise("fdsend python module is missing")
|
653 | ff81c659 | Dimitris Aragiorgis | |
654 | ff81c659 | Dimitris Aragiorgis | if "getfd" not in self.supported_commands: |
655 | ff81c659 | Dimitris Aragiorgis | _raise("getfd qmp command is not supported")
|
656 | ff81c659 | Dimitris Aragiorgis | |
657 | ff81c659 | Dimitris Aragiorgis | if "netdev_add" not in self.supported_commands: |
658 | ff81c659 | Dimitris Aragiorgis | _raise("netdev_add qmp command is not supported")
|
659 | ff81c659 | Dimitris Aragiorgis | |
660 | d9982f38 | Dimitris Aragiorgis | def _GetFd(self, fd, fdname): |
661 | 81bd73d1 | Dimitris Aragiorgis | """Wrapper around the getfd qmp command
|
662 | 81bd73d1 | Dimitris Aragiorgis |
|
663 | 81bd73d1 | Dimitris Aragiorgis | Use fdsend to send an fd to a running process via SCM_RIGHTS and then use
|
664 | 81bd73d1 | Dimitris Aragiorgis | the getfd qmp command to name it properly so that it can be used
|
665 | 81bd73d1 | Dimitris Aragiorgis | later by NIC hotplugging.
|
666 | 81bd73d1 | Dimitris Aragiorgis |
|
667 | 81bd73d1 | Dimitris Aragiorgis | @type fd: int
|
668 | 81bd73d1 | Dimitris Aragiorgis | @param fd: The file descriptor to pass
|
669 | 81bd73d1 | Dimitris Aragiorgis | @raise errors.HypervisorError: If getfd fails for some reason
|
670 | 81bd73d1 | Dimitris Aragiorgis |
|
671 | 81bd73d1 | Dimitris Aragiorgis | """
|
672 | 81bd73d1 | Dimitris Aragiorgis | self._check_connection()
|
673 | 81bd73d1 | Dimitris Aragiorgis | try:
|
674 | 81bd73d1 | Dimitris Aragiorgis | fdsend.sendfds(self.sock, " ", fds=[fd]) |
675 | 81bd73d1 | Dimitris Aragiorgis | arguments = { |
676 | 81bd73d1 | Dimitris Aragiorgis | "fdname": fdname,
|
677 | 81bd73d1 | Dimitris Aragiorgis | } |
678 | 81bd73d1 | Dimitris Aragiorgis | self.Execute("getfd", arguments) |
679 | 81bd73d1 | Dimitris Aragiorgis | except errors.HypervisorError, err:
|
680 | 81bd73d1 | Dimitris Aragiorgis | logging.info("Passing fd %s via SCM_RIGHTS failed: %s", fd, err)
|
681 | 81bd73d1 | Dimitris Aragiorgis | raise
|
682 | 81bd73d1 | Dimitris Aragiorgis | |
683 | d9982f38 | Dimitris Aragiorgis | def _AddFd(self, fd): |
684 | 105a40f2 | Dimitris Aragiorgis | """Wrapper around add-fd qmp command
|
685 | 655188a2 | Dimitris Aragiorgis |
|
686 | 105a40f2 | Dimitris Aragiorgis | Use fdsend to send fd to a running process via SCM_RIGHTS and then add-fd
|
687 | 105a40f2 | Dimitris Aragiorgis | qmp command to add it to an fdset so that it can be used later by
|
688 | 105a40f2 | Dimitris Aragiorgis | disk hotplugging.
|
689 | 655188a2 | Dimitris Aragiorgis |
|
690 | 105a40f2 | Dimitris Aragiorgis | @type fd: int
|
691 | 105a40f2 | Dimitris Aragiorgis | @param fd: The file descriptor to pass
|
692 | 655188a2 | Dimitris Aragiorgis |
|
693 | 105a40f2 | Dimitris Aragiorgis | @return: The fdset ID that the fd has been added to
|
694 | 105a40f2 | Dimitris Aragiorgis | @raise errors.HypervisorError: If add-fd fails for some reason
|
695 | 655188a2 | Dimitris Aragiorgis |
|
696 | 655188a2 | Dimitris Aragiorgis | """
|
697 | 655188a2 | Dimitris Aragiorgis | self._check_connection()
|
698 | 655188a2 | Dimitris Aragiorgis | try:
|
699 | 105a40f2 | Dimitris Aragiorgis | fdsend.sendfds(self.sock, " ", fds=[fd]) |
700 | 655188a2 | Dimitris Aragiorgis | # Omit fdset-id and let qemu create a new one (see qmp-commands.hx)
|
701 | 105a40f2 | Dimitris Aragiorgis | response = self.Execute("add-fd") |
702 | 655188a2 | Dimitris Aragiorgis | fdset = response["fdset-id"]
|
703 | 655188a2 | Dimitris Aragiorgis | except errors.HypervisorError, err:
|
704 | 105a40f2 | Dimitris Aragiorgis | logging.info("Passing fd %s via SCM_RIGHTS failed: %s", fd, err)
|
705 | 105a40f2 | Dimitris Aragiorgis | raise
|
706 | 655188a2 | Dimitris Aragiorgis | |
707 | 655188a2 | Dimitris Aragiorgis | return fdset
|
708 | 655188a2 | Dimitris Aragiorgis | |
709 | d9982f38 | Dimitris Aragiorgis | def _RemoveFdset(self, fdset): |
710 | 105a40f2 | Dimitris Aragiorgis | """Wrapper around remove-fd qmp command
|
711 | 655188a2 | Dimitris Aragiorgis |
|
712 | 105a40f2 | Dimitris Aragiorgis | Remove the file descriptor previously passed. After qemu has dup'd the fd
|
713 | 105a40f2 | Dimitris Aragiorgis | (e.g. during disk hotplug), it can be safely removed.
|
714 | 655188a2 | Dimitris Aragiorgis |
|
715 | 655188a2 | Dimitris Aragiorgis | """
|
716 | 655188a2 | Dimitris Aragiorgis | self._check_connection()
|
717 | 105a40f2 | Dimitris Aragiorgis | # Omit the fd to cleanup all fds in the fdset (see qemu/qmp-commands.hx)
|
718 | 655188a2 | Dimitris Aragiorgis | try:
|
719 | 105a40f2 | Dimitris Aragiorgis | self.Execute("remove-fd", {"fdset-id": fdset}) |
720 | 655188a2 | Dimitris Aragiorgis | except errors.HypervisorError, err:
|
721 | 105a40f2 | Dimitris Aragiorgis | # There is no big deal if we cannot remove an fdset. This cleanup here is
|
722 | 105a40f2 | Dimitris Aragiorgis | # done on a best effort basis. Upon next hot-add a new fdset will be
|
723 | 105a40f2 | Dimitris Aragiorgis | # created. If we raise an exception here, that is after drive_add has
|
724 | 105a40f2 | Dimitris Aragiorgis | # succeeded, the whole hot-add action will fail and the runtime file will
|
725 | 105a40f2 | Dimitris Aragiorgis | # not be updated which will make the instance non migrate-able
|
726 | 105a40f2 | Dimitris Aragiorgis | logging.info("Removing fdset with id %s failed: %s", fdset, err) |