/usr/lib/python2.7/dist-packages/oslo_config/generator.py is in python-oslo.config 1:3.17.0-3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 | # Copyright 2012 SINA Corporation
# Copyright 2014 Cisco Systems, Inc.
# All Rights Reserved.
# Copyright 2014 Red Hat, Inc.
#
# Licensed under the Apache License, Version 2.0 (the "License"); you may
# not use this file except in compliance with the License. You may obtain
# a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
# License for the specific language governing permissions and limitations
# under the License.
"""Sample configuration generator
Tool for generating a sample configuration file. See
../doc/source/generator.rst for details.
.. versionadded:: 1.4
"""
import collections
import logging
import operator
import sys
import textwrap
import pkg_resources
import six
from oslo_config._i18n import _LW
from oslo_config import cfg
import stevedore.named # noqa
LOG = logging.getLogger(__name__)
_generator_opts = [
cfg.StrOpt('output-file',
help='Path of the file to write to. Defaults to stdout.'),
cfg.IntOpt('wrap-width',
default=70,
help='The maximum length of help lines.'),
cfg.MultiStrOpt('namespace',
required=True,
help='Option namespace under "oslo.config.opts" in which '
'to query for options.'),
cfg.BoolOpt('minimal', default=False,
help='Generate a minimal required configuration.'),
]
def register_cli_opts(conf):
"""Register the formatter's CLI options with a ConfigOpts instance.
Note, this must be done before the ConfigOpts instance is called to parse
the configuration.
:param conf: a ConfigOpts instance
:raises: DuplicateOptError, ArgsAlreadyParsedError
"""
conf.register_cli_opts(_generator_opts)
def _format_defaults(opt):
"Return a list of formatted default values."
if isinstance(opt, cfg.MultiStrOpt):
if opt.sample_default is not None:
defaults = opt.sample_default
elif not opt.default:
defaults = ['']
else:
defaults = opt.default
else:
if opt.sample_default is not None:
default_str = str(opt.sample_default)
elif opt.default is None:
default_str = '<None>'
elif (isinstance(opt, (cfg.StrOpt, cfg.IPOpt,
cfg.HostnameOpt, cfg.URIOpt))):
default_str = opt.default
elif isinstance(opt, cfg.BoolOpt):
default_str = str(opt.default).lower()
elif isinstance(opt, (cfg.IntOpt, cfg.FloatOpt,
cfg.PortOpt)):
default_str = str(opt.default)
elif isinstance(opt, (cfg.ListOpt, cfg._ConfigFileOpt,
cfg._ConfigDirOpt)):
default_str = ','.join(opt.default)
elif isinstance(opt, cfg.DictOpt):
sorted_items = sorted(opt.default.items(),
key=operator.itemgetter(0))
default_str = ','.join(['%s:%s' % i for i in sorted_items])
else:
LOG.warning(_LW('Unknown option type: %s'), repr(opt))
default_str = str(opt.default)
defaults = [default_str]
results = []
for default_str in defaults:
if default_str.strip() != default_str:
default_str = '"%s"' % default_str
results.append(default_str)
return results
_TYPE_NAMES = {
str: 'string value',
int: 'integer value',
float: 'floating point value',
}
def _format_type_name(opt_type):
"""Format the type name to use in describing an option"""
try:
return opt_type.type_name
except AttributeError: # nosec
pass
try:
return _TYPE_NAMES[opt_type]
except KeyError: # nosec
pass
return 'unknown value'
class _OptFormatter(object):
"""Format configuration option descriptions to a file."""
def __init__(self, output_file=None, wrap_width=70):
"""Construct an OptFormatter object.
:param output_file: a writeable file object
:param wrap_width: The maximum length of help lines, 0 to not wrap
"""
self.output_file = output_file or sys.stdout
self.wrap_width = wrap_width
def _format_help(self, help_text):
"""Format the help for a group or option to the output file.
:param help_text: The text of the help string
"""
if self.wrap_width is not None and self.wrap_width > 0:
wrapped = ""
for line in help_text.splitlines():
text = "\n".join(textwrap.wrap(line, self.wrap_width,
initial_indent='# ',
subsequent_indent='# ',
break_long_words=False,
replace_whitespace=False))
wrapped += "#" if text == "" else text
wrapped += "\n"
lines = [wrapped]
else:
lines = ['# ' + help_text + '\n']
return lines
def _get_choice_text(self, choice):
if choice is None:
return '<None>'
elif choice == '':
return "''"
return six.text_type(choice)
def format_group(self, group_or_groupname):
"""Format the description of a group header to the output file
:param group_or_groupname: a cfg.OptGroup instance or a name of group
"""
if isinstance(group_or_groupname, cfg.OptGroup):
group = group_or_groupname
lines = ['[%s]\n' % group.name]
if group.help:
lines += self._format_help(group.help)
else:
groupname = group_or_groupname
lines = ['[%s]\n' % groupname]
self.writelines(lines)
def format(self, opt, group_name, minimal=False):
"""Format a description of an option to the output file.
:param opt: a cfg.Opt instance
"""
if not opt.help:
LOG.warning(_LW('"%s" is missing a help string'), opt.dest)
opt_type = _format_type_name(opt.type)
opt_prefix = ''
if (opt.deprecated_for_removal and
not opt.help.startswith('DEPRECATED')):
opt_prefix = 'DEPRECATED: '
if opt.help:
help_text = u'%s%s (%s)' % (opt_prefix,
opt.help,
opt_type)
else:
help_text = u'(%s)' % opt_type
lines = self._format_help(help_text)
if getattr(opt.type, 'min', None) is not None:
lines.append('# Minimum value: %d\n' % opt.type.min)
if getattr(opt.type, 'max', None) is not None:
lines.append('# Maximum value: %d\n' % opt.type.max)
if getattr(opt.type, 'choices', None):
choices_text = ', '.join([self._get_choice_text(choice)
for choice in opt.type.choices])
lines.append('# Allowed values: %s\n' % choices_text)
try:
if opt.mutable:
lines.append(
'# Note: This option can be changed without restarting.\n'
)
except AttributeError as err:
# NOTE(dhellmann): keystoneauth defines its own Opt class,
# and neutron (at least) returns instances of those
# classes instead of oslo_config Opt instances. The new
# mutable attribute is the first property where the API
# isn't supported in the external class, so we can use
# this failure to emit a warning. See
# https://bugs.launchpad.net/keystoneauth/+bug/1548433 for
# more details.
import warnings
if not isinstance(opt, cfg.Opt):
warnings.warn(
'Incompatible option class for %s (%r): %s' %
(opt.dest, opt.__class__, err),
)
else:
warnings.warn('Failed to fully format sample for %s: %s' %
(opt.dest, err))
for d in opt.deprecated_opts:
lines.append('# Deprecated group/name - [%s]/%s\n' %
(d.group or group_name, d.name or opt.dest))
if opt.deprecated_for_removal:
if opt.deprecated_since:
lines.append(
'# This option is deprecated for removal since %s.\n' % (
opt.deprecated_since))
else:
lines.append(
'# This option is deprecated for removal.\n')
lines.append(
'# Its value may be silently ignored in the future.\n')
if opt.deprecated_reason:
lines.extend(
self._format_help('Reason: ' + opt.deprecated_reason))
if opt.advanced:
lines.append(
'# Advanced Option: intended for advanced users and not used\n'
'# by the majority of users, and might have a significant\n'
'# effect on stability and/or performance.\n'
)
if hasattr(opt.type, 'format_defaults'):
defaults = opt.type.format_defaults(opt.default,
opt.sample_default)
else:
LOG.debug(
"The type for option %(name)s which is %(type)s is not a "
"subclass of types.ConfigType and doesn't provide a "
"'format_defaults' method. A default formatter is not "
"available so the best-effort formatter will be used.",
{'type': opt.type, 'name': opt.name})
defaults = _format_defaults(opt)
for default_str in defaults:
if default_str:
default_str = ' ' + default_str
if minimal:
lines.append('%s =%s\n' % (opt.dest, default_str))
else:
lines.append('#%s =%s\n' % (opt.dest, default_str))
self.writelines(lines)
def write(self, s):
"""Write an arbitrary string to the output file.
:param s: an arbitrary string
"""
self.output_file.write(s)
def writelines(self, l):
"""Write an arbitrary sequence of strings to the output file.
:param l: a list of arbitrary strings
"""
self.output_file.writelines(l)
def _cleanup_opts(read_opts):
"""Cleanup duplicate options in namespace groups
Return a structure which removes duplicate options from a namespace group.
NOTE:(rbradfor) This does not remove duplicated options from repeating
groups in different namespaces:
:param read_opts: a list (namespace, [(group, [opt_1, opt_2])]) tuples
:returns: a list of (namespace, [(group, [opt_1, opt_2])]) tuples
"""
# OrderedDict is used specifically in the three levels to maintain the
# source order of namespace/group/opt values
clean = collections.OrderedDict()
for namespace, listing in read_opts:
if namespace not in clean:
clean[namespace] = collections.OrderedDict()
for group, opts in listing:
if group not in clean[namespace]:
clean[namespace][group] = collections.OrderedDict()
for opt in opts:
clean[namespace][group][opt.dest] = opt
# recreate the list of (namespace, [(group, [opt_1, opt_2])]) tuples
# from the cleaned structure.
cleaned_opts = [
(namespace, [(group, list(clean[namespace][group].values()))
for group in clean[namespace]])
for namespace in clean
]
return cleaned_opts
def _get_raw_opts_loaders(namespaces):
"""List the options available via the given namespaces.
:param namespaces: a list of namespaces registered under 'oslo.config.opts'
:returns: a list of (namespace, [(group, [opt_1, opt_2])]) tuples
"""
mgr = stevedore.named.NamedExtensionManager(
'oslo.config.opts',
names=namespaces,
on_load_failure_callback=on_load_failure_callback,
invoke_on_load=False)
return [(e.name, e.plugin) for e in mgr]
def _get_opt_default_updaters(namespaces):
mgr = stevedore.named.NamedExtensionManager(
'oslo.config.opts.defaults',
names=namespaces,
on_load_failure_callback=on_load_failure_callback,
invoke_on_load=False)
return [ep.plugin for ep in mgr]
def _update_defaults(namespaces):
"Let application hooks update defaults inside libraries."
for update in _get_opt_default_updaters(namespaces):
update()
def _list_opts(namespaces):
"""List the options available via the given namespaces.
Duplicate options from a namespace are removed.
:param namespaces: a list of namespaces registered under 'oslo.config.opts'
:returns: a list of (namespace, [(group, [opt_1, opt_2])]) tuples
"""
# Load the functions to get the options.
loaders = _get_raw_opts_loaders(namespaces)
# Update defaults, which might change global settings in library
# modules.
_update_defaults(namespaces)
# Ask for the option definitions. At this point any global default
# changes made by the updaters should be in effect.
opts = [
(namespace, loader())
for namespace, loader in loaders
]
return _cleanup_opts(opts)
def on_load_failure_callback(*args, **kwargs):
raise
def _output_opts(f, group, group_data, minimal=False):
f.format_group(group_data['object'] or group)
for (namespace, opts) in sorted(group_data['namespaces'],
key=operator.itemgetter(0)):
f.write('\n#\n# From %s\n#\n' % namespace)
for opt in sorted(opts, key=operator.attrgetter('advanced')):
try:
if minimal and not opt.required:
pass
else:
f.write('\n')
f.format(opt, group, minimal)
except Exception as err:
f.write('# Warning: Failed to format sample for %s\n' %
(opt.dest,))
f.write('# %s\n' % (err,))
def _get_groups(conf_ns):
"""Invert a list of groups by namespace into a dict by group name.
:param conf_ns: a list of (namespace, [(<group>, [opt_1, opt_2])]) tuples,
such as returned by _list_opts.
:returns: {<group_name>, {'object': <group_object>,
'namespaces': [(<namespace>, <opts>)]}}
<group> may be a string or a group object.
<group_name> is always a string.
<group_object> will only be set if <group> was a group object in at least
one namespace.
Keying by group_name avoids adding duplicate group names in case a group is
added as both an OptGroup and as a str, but still makes the additional
OptGroup data available to the output code when possible.
"""
groups = {'DEFAULT': {'object': None, 'namespaces': []}}
for namespace, listing in conf_ns:
for group, opts in listing:
if not opts:
continue
group = group if group else 'DEFAULT'
is_optgroup = hasattr(group, 'name')
group_name = group.name if is_optgroup else group
if group_name not in groups:
groups[group_name] = {'object': None, 'namespaces': []}
if is_optgroup:
groups[group_name]['object'] = group
groups[group_name]['namespaces'].append((namespace, opts))
return groups
def generate(conf):
"""Generate a sample config file.
List all of the options available via the namespaces specified in the given
configuration and write a description of them to the specified output file.
:param conf: a ConfigOpts instance containing the generator's configuration
"""
conf.register_opts(_generator_opts)
output_file = (open(conf.output_file, 'w')
if conf.output_file else sys.stdout)
formatter = _OptFormatter(output_file=output_file,
wrap_width=conf.wrap_width)
groups = _get_groups(_list_opts(conf.namespace))
# Output the "DEFAULT" section as the very first section
_output_opts(formatter, 'DEFAULT', groups.pop('DEFAULT'), conf.minimal)
# output all other config sections with groups in alphabetical order
for group, group_data in sorted(groups.items()):
formatter.write('\n\n')
_output_opts(formatter, group, group_data, conf.minimal)
def main(args=None):
"""The main function of oslo-config-generator."""
version = pkg_resources.get_distribution('oslo.config').version
logging.basicConfig(level=logging.WARN)
conf = cfg.ConfigOpts()
register_cli_opts(conf)
conf(args, version=version)
generate(conf)
if __name__ == '__main__':
main()
|