Statistics
| Branch: | Tag: | Revision:

root / lib / hypervisor / hv_fake.py @ 47387b1e

History | View | Annotate | Download (6.5 kB)

1
#
2
#
3

    
4
# Copyright (C) 2006, 2007, 2008 Google Inc.
5
#
6
# This program is free software; you can redistribute it and/or modify
7
# it under the terms of the GNU General Public License as published by
8
# the Free Software Foundation; either version 2 of the License, or
9
# (at your option) any later version.
10
#
11
# This program is distributed in the hope that it will be useful, but
12
# WITHOUT ANY WARRANTY; without even the implied warranty of
13
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
14
# General Public License for more details.
15
#
16
# You should have received a copy of the GNU General Public License
17
# along with this program; if not, write to the Free Software
18
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
19
# 02110-1301, USA.
20

    
21

    
22
"""Fake hypervisor
23

24
"""
25

    
26
import os
27
import os.path
28
import re
29

    
30
from ganeti import utils
31
from ganeti import constants
32
from ganeti import errors
33
from ganeti.hypervisor import hv_base
34

    
35

    
36
class FakeHypervisor(hv_base.BaseHypervisor):
37
  """Fake hypervisor interface.
38

39
  This can be used for testing the ganeti code without having to have
40
  a real virtualisation software installed.
41

42
  """
43
  _ROOT_DIR = constants.RUN_DIR + "/ganeti-fake-hypervisor"
44

    
45
  def __init__(self):
46
    hv_base.BaseHypervisor.__init__(self)
47
    if not os.path.exists(self._ROOT_DIR):
48
      os.mkdir(self._ROOT_DIR)
49

    
50
  def ListInstances(self):
51
    """Get the list of running instances.
52

53
    """
54
    return os.listdir(self._ROOT_DIR)
55

    
56
  def GetInstanceInfo(self, instance_name):
57
    """Get instance properties.
58

59
    Args:
60
      instance_name: the instance name
61

62
    Returns:
63
      (name, id, memory, vcpus, stat, times)
64
    """
65
    file_name = "%s/%s" % (self._ROOT_DIR, instance_name)
66
    if not os.path.exists(file_name):
67
      return None
68
    try:
69
      fh = file(file_name, "r")
70
      try:
71
        inst_id = fh.readline().strip()
72
        memory = fh.readline().strip()
73
        vcpus = fh.readline().strip()
74
        stat = "---b-"
75
        times = "0"
76
        return (instance_name, inst_id, memory, vcpus, stat, times)
77
      finally:
78
        fh.close()
79
    except IOError, err:
80
      raise errors.HypervisorError("Failed to list instance %s: %s" %
81
                                   (instance_name, err))
82

    
83
  def GetAllInstancesInfo(self):
84
    """Get properties of all instances.
85

86
    Returns:
87
      [(name, id, memory, vcpus, stat, times),...]
88
    """
89
    data = []
90
    for file_name in os.listdir(self._ROOT_DIR):
91
      try:
92
        fh = file(self._ROOT_DIR+"/"+file_name, "r")
93
        inst_id = "-1"
94
        memory = "0"
95
        stat = "-----"
96
        times = "-1"
97
        try:
98
          inst_id = fh.readline().strip()
99
          memory = fh.readline().strip()
100
          vcpus = fh.readline().strip()
101
          stat = "---b-"
102
          times = "0"
103
        finally:
104
          fh.close()
105
        data.append((file_name, inst_id, memory, vcpus, stat, times))
106
      except IOError, err:
107
        raise errors.HypervisorError("Failed to list instances: %s" % err)
108
    return data
109

    
110
  def StartInstance(self, instance, block_devices, extra_args):
111
    """Start an instance.
112

113
    For the fake hypervisor, it just creates a file in the base dir,
114
    creating an exception if it already exists. We don't actually
115
    handle race conditions properly, since these are *FAKE* instances.
116

117
    """
118
    file_name = self._ROOT_DIR + "/%s" % instance.name
119
    if os.path.exists(file_name):
120
      raise errors.HypervisorError("Failed to start instance %s: %s" %
121
                                   (instance.name, "already running"))
122
    try:
123
      fh = file(file_name, "w")
124
      try:
125
        fh.write("0\n%d\n%d\n" %
126
                 (instance.beparams[constants.BE_MEMORY],
127
                  instance.beparams[constants.BE_VCPUS]))
128
      finally:
129
        fh.close()
130
    except IOError, err:
131
      raise errors.HypervisorError("Failed to start instance %s: %s" %
132
                                   (instance.name, err))
133

    
134
  def StopInstance(self, instance, force=False):
135
    """Stop an instance.
136

137
    For the fake hypervisor, this just removes the file in the base
138
    dir, if it exist, otherwise we raise an exception.
139

140
    """
141
    file_name = self._ROOT_DIR + "/%s" % instance.name
142
    if not os.path.exists(file_name):
143
      raise errors.HypervisorError("Failed to stop instance %s: %s" %
144
                                   (instance.name, "not running"))
145
    utils.RemoveFile(file_name)
146

    
147
  def RebootInstance(self, instance):
148
    """Reboot an instance.
149

150
    For the fake hypervisor, this does nothing.
151

152
    """
153
    return
154

    
155
  def GetNodeInfo(self):
156
    """Return information about the node.
157

158
    The return value is a dict, which has to have the following items:
159
      (all values in MiB)
160
      - memory_total: the total memory size on the node
161
      - memory_free: the available memory on the node for instances
162
      - memory_dom0: the memory used by the node itself, if available
163

164
    """
165
    # global ram usage from the xm info command
166
    # memory                 : 3583
167
    # free_memory            : 747
168
    # note: in xen 3, memory has changed to total_memory
169
    try:
170
      fh = file("/proc/meminfo")
171
      try:
172
        data = fh.readlines()
173
      finally:
174
        fh.close()
175
    except IOError, err:
176
      raise errors.HypervisorError("Failed to list node info: %s" % err)
177

    
178
    result = {}
179
    sum_free = 0
180
    for line in data:
181
      splitfields = line.split(":", 1)
182

    
183
      if len(splitfields) > 1:
184
        key = splitfields[0].strip()
185
        val = splitfields[1].strip()
186
        if key == 'MemTotal':
187
          result['memory_total'] = int(val.split()[0])/1024
188
        elif key in ('MemFree', 'Buffers', 'Cached'):
189
          sum_free += int(val.split()[0])/1024
190
        elif key == 'Active':
191
          result['memory_dom0'] = int(val.split()[0])/1024
192
    result['memory_free'] = sum_free
193

    
194
    cpu_total = 0
195
    try:
196
      fh = open("/proc/cpuinfo")
197
      try:
198
        cpu_total = len(re.findall("(?m)^processor\s*:\s*[0-9]+\s*$",
199
                                   fh.read()))
200
      finally:
201
        fh.close()
202
    except EnvironmentError, err:
203
      raise errors.HypervisorError("Failed to list node info: %s" % err)
204
    result['cpu_total'] = cpu_total
205

    
206
    return result
207

    
208
  @staticmethod
209
  def GetShellCommandForConsole(instance):
210
    """Return a command for connecting to the console of an instance.
211

212
    """
213
    return "echo Console not available for fake hypervisor"
214

    
215
  def Verify(self):
216
    """Verify the hypervisor.
217

218
    For the fake hypervisor, it just checks the existence of the base
219
    dir.
220

221
    """
222
    if not os.path.exists(self._ROOT_DIR):
223
      return "The required directory '%s' does not exist." % self._ROOT_DIR