root / qa / qa_config.py @ c5cd9637
History | View | Annotate | Download (7.8 kB)
1 |
#
|
---|---|
2 |
#
|
3 |
|
4 |
# Copyright (C) 2007, 2011, 2012, 2013 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 |
"""QA configuration.
|
23 |
|
24 |
"""
|
25 |
|
26 |
import os |
27 |
|
28 |
from ganeti import constants |
29 |
from ganeti import utils |
30 |
from ganeti import serializer |
31 |
from ganeti import compat |
32 |
|
33 |
import qa_error |
34 |
|
35 |
|
36 |
_INSTANCE_CHECK_KEY = "instance-check"
|
37 |
_ENABLED_HV_KEY = "enabled-hypervisors"
|
38 |
# Key to store the cluster-wide run-time value of the exclusive storage flag
|
39 |
_EXCLUSIVE_STORAGE_KEY = "_exclusive_storage"
|
40 |
|
41 |
|
42 |
cfg = {} |
43 |
|
44 |
|
45 |
def Load(path): |
46 |
"""Loads the passed configuration file.
|
47 |
|
48 |
"""
|
49 |
global cfg # pylint: disable=W0603 |
50 |
|
51 |
cfg = serializer.LoadJson(utils.ReadFile(path)) |
52 |
|
53 |
Validate() |
54 |
|
55 |
|
56 |
def Validate(): |
57 |
if len(cfg["nodes"]) < 1: |
58 |
raise qa_error.Error("Need at least one node") |
59 |
if len(cfg["instances"]) < 1: |
60 |
raise qa_error.Error("Need at least one instance") |
61 |
if len(cfg["disk"]) != len(cfg["disk-growth"]): |
62 |
raise qa_error.Error("Config options 'disk' and 'disk-growth' must have" |
63 |
" the same number of items")
|
64 |
|
65 |
check = GetInstanceCheckScript() |
66 |
if check:
|
67 |
try:
|
68 |
os.stat(check) |
69 |
except EnvironmentError, err: |
70 |
raise qa_error.Error("Can't find instance check script '%s': %s" % |
71 |
(check, err)) |
72 |
|
73 |
enabled_hv = frozenset(GetEnabledHypervisors())
|
74 |
if not enabled_hv: |
75 |
raise qa_error.Error("No hypervisor is enabled") |
76 |
|
77 |
difference = enabled_hv - constants.HYPER_TYPES |
78 |
if difference:
|
79 |
raise qa_error.Error("Unknown hypervisor(s) enabled: %s" % |
80 |
utils.CommaJoin(difference)) |
81 |
|
82 |
|
83 |
def get(name, default=None): |
84 |
return cfg.get(name, default)
|
85 |
|
86 |
|
87 |
class Either: |
88 |
def __init__(self, tests): |
89 |
"""Initializes this class.
|
90 |
|
91 |
@type tests: list or string
|
92 |
@param tests: List of test names
|
93 |
@see: L{TestEnabled} for details
|
94 |
|
95 |
"""
|
96 |
self.tests = tests
|
97 |
|
98 |
|
99 |
def _MakeSequence(value): |
100 |
"""Make sequence of single argument.
|
101 |
|
102 |
If the single argument is not already a list or tuple, a list with the
|
103 |
argument as a single item is returned.
|
104 |
|
105 |
"""
|
106 |
if isinstance(value, (list, tuple)): |
107 |
return value
|
108 |
else:
|
109 |
return [value]
|
110 |
|
111 |
|
112 |
def _TestEnabledInner(check_fn, names, fn): |
113 |
"""Evaluate test conditions.
|
114 |
|
115 |
@type check_fn: callable
|
116 |
@param check_fn: Callback to check whether a test is enabled
|
117 |
@type names: sequence or string
|
118 |
@param names: Test name(s)
|
119 |
@type fn: callable
|
120 |
@param fn: Aggregation function
|
121 |
@rtype: bool
|
122 |
@return: Whether test is enabled
|
123 |
|
124 |
"""
|
125 |
names = _MakeSequence(names) |
126 |
|
127 |
result = [] |
128 |
|
129 |
for name in names: |
130 |
if isinstance(name, Either): |
131 |
value = _TestEnabledInner(check_fn, name.tests, compat.any) |
132 |
elif isinstance(name, (list, tuple)): |
133 |
value = _TestEnabledInner(check_fn, name, compat.all) |
134 |
else:
|
135 |
value = check_fn(name) |
136 |
|
137 |
result.append(value) |
138 |
|
139 |
return fn(result)
|
140 |
|
141 |
|
142 |
def TestEnabled(tests, _cfg=None): |
143 |
"""Returns True if the given tests are enabled.
|
144 |
|
145 |
@param tests: A single test as a string, or a list of tests to check; can
|
146 |
contain L{Either} for OR conditions, AND is default
|
147 |
|
148 |
"""
|
149 |
if _cfg is None: |
150 |
_cfg = cfg |
151 |
|
152 |
# Get settings for all tests
|
153 |
cfg_tests = _cfg.get("tests", {})
|
154 |
|
155 |
# Get default setting
|
156 |
default = cfg_tests.get("default", True) |
157 |
|
158 |
return _TestEnabledInner(lambda name: cfg_tests.get(name, default), |
159 |
tests, compat.all) |
160 |
|
161 |
|
162 |
def GetInstanceCheckScript(): |
163 |
"""Returns path to instance check script or C{None}.
|
164 |
|
165 |
"""
|
166 |
return cfg.get(_INSTANCE_CHECK_KEY, None) |
167 |
|
168 |
|
169 |
def GetEnabledHypervisors(): |
170 |
"""Returns list of enabled hypervisors.
|
171 |
|
172 |
@rtype: list
|
173 |
|
174 |
"""
|
175 |
try:
|
176 |
value = cfg[_ENABLED_HV_KEY] |
177 |
except KeyError: |
178 |
return [constants.DEFAULT_ENABLED_HYPERVISOR]
|
179 |
else:
|
180 |
if isinstance(value, basestring): |
181 |
# The configuration key ("enabled-hypervisors") implies there can be
|
182 |
# multiple values. Multiple hypervisors are comma-separated on the
|
183 |
# command line option to "gnt-cluster init", so we need to handle them
|
184 |
# equally here.
|
185 |
return value.split(",") |
186 |
else:
|
187 |
return value
|
188 |
|
189 |
|
190 |
def GetDefaultHypervisor(): |
191 |
"""Returns the default hypervisor to be used.
|
192 |
|
193 |
"""
|
194 |
return GetEnabledHypervisors()[0] |
195 |
|
196 |
|
197 |
def GetInstanceNicMac(inst, default=None): |
198 |
"""Returns MAC address for instance's network interface.
|
199 |
|
200 |
"""
|
201 |
return inst.get("nic.mac/0", default) |
202 |
|
203 |
|
204 |
def GetMasterNode(): |
205 |
return cfg["nodes"][0] |
206 |
|
207 |
|
208 |
def AcquireInstance(): |
209 |
"""Returns an instance which isn't in use.
|
210 |
|
211 |
"""
|
212 |
# Filter out unwanted instances
|
213 |
tmp_flt = lambda inst: not inst.get("_used", False) |
214 |
instances = filter(tmp_flt, cfg["instances"]) |
215 |
del tmp_flt
|
216 |
|
217 |
if len(instances) == 0: |
218 |
raise qa_error.OutOfInstancesError("No instances left") |
219 |
|
220 |
inst = instances[0]
|
221 |
inst["_used"] = True |
222 |
inst["_template"] = None |
223 |
return inst
|
224 |
|
225 |
|
226 |
def ReleaseInstance(inst): |
227 |
inst["_used"] = False |
228 |
|
229 |
|
230 |
def GetInstanceTemplate(inst): |
231 |
"""Return the disk template of an instance.
|
232 |
|
233 |
"""
|
234 |
templ = inst["_template"]
|
235 |
assert templ is not None |
236 |
return templ
|
237 |
|
238 |
|
239 |
def SetInstanceTemplate(inst, template): |
240 |
"""Set the disk template for an instance.
|
241 |
|
242 |
"""
|
243 |
inst["_template"] = template
|
244 |
|
245 |
|
246 |
def SetExclusiveStorage(value): |
247 |
"""Set the expected value of the exclusive_storage flag for the cluster.
|
248 |
|
249 |
"""
|
250 |
cfg[_EXCLUSIVE_STORAGE_KEY] = bool(value)
|
251 |
|
252 |
|
253 |
def GetExclusiveStorage(): |
254 |
"""Get the expected value of the exclusive_storage flag for the cluster.
|
255 |
|
256 |
"""
|
257 |
val = cfg.get(_EXCLUSIVE_STORAGE_KEY) |
258 |
assert val is not None |
259 |
return val
|
260 |
|
261 |
|
262 |
def IsTemplateSupported(templ): |
263 |
"""Is the given templated supported by the current configuration?
|
264 |
|
265 |
"""
|
266 |
if GetExclusiveStorage():
|
267 |
return templ in constants.DTS_EXCL_STORAGE |
268 |
else:
|
269 |
return True |
270 |
|
271 |
|
272 |
def AcquireNode(exclude=None): |
273 |
"""Returns the least used node.
|
274 |
|
275 |
"""
|
276 |
master = GetMasterNode() |
277 |
|
278 |
# Filter out unwanted nodes
|
279 |
# TODO: Maybe combine filters
|
280 |
if exclude is None: |
281 |
nodes = cfg["nodes"][:]
|
282 |
elif isinstance(exclude, (list, tuple)): |
283 |
nodes = filter(lambda node: node not in exclude, cfg["nodes"]) |
284 |
else:
|
285 |
nodes = filter(lambda node: node != exclude, cfg["nodes"]) |
286 |
|
287 |
tmp_flt = lambda node: node.get("_added", False) or node == master |
288 |
nodes = filter(tmp_flt, nodes)
|
289 |
del tmp_flt
|
290 |
|
291 |
if len(nodes) == 0: |
292 |
raise qa_error.OutOfNodesError("No nodes left") |
293 |
|
294 |
# Get node with least number of uses
|
295 |
def compare(a, b): |
296 |
result = cmp(a.get("_count", 0), b.get("_count", 0)) |
297 |
if result == 0: |
298 |
result = cmp(a["primary"], b["primary"]) |
299 |
return result
|
300 |
|
301 |
nodes.sort(cmp=compare) |
302 |
|
303 |
node = nodes[0]
|
304 |
node["_count"] = node.get("_count", 0) + 1 |
305 |
return node
|
306 |
|
307 |
|
308 |
def AcquireManyNodes(num, exclude=None): |
309 |
"""Return the least used nodes.
|
310 |
|
311 |
@type num: int
|
312 |
@param num: Number of nodes; can be 0.
|
313 |
@type exclude: list of nodes or C{None}
|
314 |
@param exclude: nodes to be excluded from the choice
|
315 |
@rtype: list of nodes
|
316 |
@return: C{num} different nodes
|
317 |
|
318 |
"""
|
319 |
nodes = [] |
320 |
if exclude is None: |
321 |
exclude = [] |
322 |
elif isinstance(exclude, (list, tuple)): |
323 |
# Don't modify the incoming argument
|
324 |
exclude = list(exclude)
|
325 |
else:
|
326 |
exclude = [exclude] |
327 |
|
328 |
try:
|
329 |
for _ in range(0, num): |
330 |
n = AcquireNode(exclude=exclude) |
331 |
nodes.append(n) |
332 |
exclude.append(n) |
333 |
except qa_error.OutOfNodesError:
|
334 |
ReleaseManyNodes(nodes) |
335 |
raise
|
336 |
return nodes
|
337 |
|
338 |
|
339 |
def ReleaseNode(node): |
340 |
node["_count"] = node.get("_count", 0) - 1 |
341 |
|
342 |
|
343 |
def ReleaseManyNodes(nodes): |
344 |
for n in nodes: |
345 |
ReleaseNode(n) |