/usr/lib/python2.7/dist-packages/logilab/common/configuration.py is in python-logilab-common 1.4.1-1.
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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 | # copyright 2003-2012 LOGILAB S.A. (Paris, FRANCE), all rights reserved.
# contact http://www.logilab.fr/ -- mailto:contact@logilab.fr
#
# This file is part of logilab-common.
#
# logilab-common is free software: you can redistribute it and/or modify it under
# the terms of the GNU Lesser General Public License as published by the Free
# Software Foundation, either version 2.1 of the License, or (at your option) any
# later version.
#
# logilab-common is distributed in the hope that it will be useful, but WITHOUT
# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
# FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
# details.
#
# You should have received a copy of the GNU Lesser General Public License along
# with logilab-common. If not, see <http://www.gnu.org/licenses/>.
"""Classes to handle advanced configuration in simple to complex applications.
Allows to load the configuration from a file or from command line
options, to generate a sample configuration file or to display
program's usage. Fills the gap between optik/optparse and ConfigParser
by adding data types (which are also available as a standalone optik
extension in the `optik_ext` module).
Quick start: simplest usage
---------------------------
.. python ::
>>> import sys
>>> from logilab.common.configuration import Configuration
>>> options = [('dothis', {'type':'yn', 'default': True, 'metavar': '<y or n>'}),
... ('value', {'type': 'string', 'metavar': '<string>'}),
... ('multiple', {'type': 'csv', 'default': ('yop',),
... 'metavar': '<comma separated values>',
... 'help': 'you can also document the option'}),
... ('number', {'type': 'int', 'default':2, 'metavar':'<int>'}),
... ]
>>> config = Configuration(options=options, name='My config')
>>> print config['dothis']
True
>>> print config['value']
None
>>> print config['multiple']
('yop',)
>>> print config['number']
2
>>> print config.help()
Usage: [options]
Options:
-h, --help show this help message and exit
--dothis=<y or n>
--value=<string>
--multiple=<comma separated values>
you can also document the option [current: none]
--number=<int>
>>> f = open('myconfig.ini', 'w')
>>> f.write('''[MY CONFIG]
... number = 3
... dothis = no
... multiple = 1,2,3
... ''')
>>> f.close()
>>> config.load_file_configuration('myconfig.ini')
>>> print config['dothis']
False
>>> print config['value']
None
>>> print config['multiple']
['1', '2', '3']
>>> print config['number']
3
>>> sys.argv = ['mon prog', '--value', 'bacon', '--multiple', '4,5,6',
... 'nonoptionargument']
>>> print config.load_command_line_configuration()
['nonoptionargument']
>>> print config['value']
bacon
>>> config.generate_config()
# class for simple configurations which don't need the
# manager / providers model and prefer delegation to inheritance
#
# configuration values are accessible through a dict like interface
#
[MY CONFIG]
dothis=no
value=bacon
# you can also document the option
multiple=4,5,6
number=3
Note : starting with Python 2.7 ConfigParser is able to take into
account the order of occurrences of the options into a file (by
using an OrderedDict). If you have two options changing some common
state, like a 'disable-all-stuff' and a 'enable-some-stuff-a', their
order of appearance will be significant : the last specified in the
file wins. For earlier version of python and logilab.common newer
than 0.61 the behaviour is unspecified.
"""
from __future__ import print_function
__docformat__ = "restructuredtext en"
__all__ = ('OptionsManagerMixIn', 'OptionsProviderMixIn',
'ConfigurationMixIn', 'Configuration',
'OptionsManager2ConfigurationAdapter')
import os
import sys
import re
from os.path import exists, expanduser
from copy import copy
from warnings import warn
from six import integer_types, string_types
from six.moves import range, configparser as cp, input
from logilab.common.compat import str_encode as _encode
from logilab.common.deprecation import deprecated
from logilab.common.textutils import normalize_text, unquote
from logilab.common import optik_ext
OptionError = optik_ext.OptionError
REQUIRED = []
class UnsupportedAction(Exception):
"""raised by set_option when it doesn't know what to do for an action"""
def _get_encoding(encoding, stream):
encoding = encoding or getattr(stream, 'encoding', None)
if not encoding:
import locale
encoding = locale.getpreferredencoding()
return encoding
# validation functions ########################################################
# validators will return the validated value or raise optparse.OptionValueError
# XXX add to documentation
def choice_validator(optdict, name, value):
"""validate and return a converted value for option of type 'choice'
"""
if not value in optdict['choices']:
msg = "option %s: invalid value: %r, should be in %s"
raise optik_ext.OptionValueError(msg % (name, value, optdict['choices']))
return value
def multiple_choice_validator(optdict, name, value):
"""validate and return a converted value for option of type 'choice'
"""
choices = optdict['choices']
values = optik_ext.check_csv(None, name, value)
for value in values:
if not value in choices:
msg = "option %s: invalid value: %r, should be in %s"
raise optik_ext.OptionValueError(msg % (name, value, choices))
return values
def csv_validator(optdict, name, value):
"""validate and return a converted value for option of type 'csv'
"""
return optik_ext.check_csv(None, name, value)
def yn_validator(optdict, name, value):
"""validate and return a converted value for option of type 'yn'
"""
return optik_ext.check_yn(None, name, value)
def named_validator(optdict, name, value):
"""validate and return a converted value for option of type 'named'
"""
return optik_ext.check_named(None, name, value)
def file_validator(optdict, name, value):
"""validate and return a filepath for option of type 'file'"""
return optik_ext.check_file(None, name, value)
def color_validator(optdict, name, value):
"""validate and return a valid color for option of type 'color'"""
return optik_ext.check_color(None, name, value)
def password_validator(optdict, name, value):
"""validate and return a string for option of type 'password'"""
return optik_ext.check_password(None, name, value)
def date_validator(optdict, name, value):
"""validate and return a mx DateTime object for option of type 'date'"""
return optik_ext.check_date(None, name, value)
def time_validator(optdict, name, value):
"""validate and return a time object for option of type 'time'"""
return optik_ext.check_time(None, name, value)
def bytes_validator(optdict, name, value):
"""validate and return an integer for option of type 'bytes'"""
return optik_ext.check_bytes(None, name, value)
VALIDATORS = {'string': unquote,
'int': int,
'float': float,
'file': file_validator,
'font': unquote,
'color': color_validator,
'regexp': re.compile,
'csv': csv_validator,
'yn': yn_validator,
'bool': yn_validator,
'named': named_validator,
'password': password_validator,
'date': date_validator,
'time': time_validator,
'bytes': bytes_validator,
'choice': choice_validator,
'multiple_choice': multiple_choice_validator,
}
def _call_validator(opttype, optdict, option, value):
if opttype not in VALIDATORS:
raise Exception('Unsupported type "%s"' % opttype)
try:
return VALIDATORS[opttype](optdict, option, value)
except TypeError:
try:
return VALIDATORS[opttype](value)
except optik_ext.OptionValueError:
raise
except:
raise optik_ext.OptionValueError('%s value (%r) should be of type %s' %
(option, value, opttype))
# user input functions ########################################################
# user input functions will ask the user for input on stdin then validate
# the result and return the validated value or raise optparse.OptionValueError
# XXX add to documentation
def input_password(optdict, question='password:'):
from getpass import getpass
while True:
value = getpass(question)
value2 = getpass('confirm: ')
if value == value2:
return value
print('password mismatch, try again')
def input_string(optdict, question):
value = input(question).strip()
return value or None
def _make_input_function(opttype):
def input_validator(optdict, question):
while True:
value = input(question)
if not value.strip():
return None
try:
return _call_validator(opttype, optdict, None, value)
except optik_ext.OptionValueError as ex:
msg = str(ex).split(':', 1)[-1].strip()
print('bad value: %s' % msg)
return input_validator
INPUT_FUNCTIONS = {
'string': input_string,
'password': input_password,
}
for opttype in VALIDATORS.keys():
INPUT_FUNCTIONS.setdefault(opttype, _make_input_function(opttype))
# utility functions ############################################################
def expand_default(self, option):
"""monkey patch OptionParser.expand_default since we have a particular
way to handle defaults to avoid overriding values in the configuration
file
"""
if self.parser is None or not self.default_tag:
return option.help
optname = option._long_opts[0][2:]
try:
provider = self.parser.options_manager._all_options[optname]
except KeyError:
value = None
else:
optdict = provider.get_option_def(optname)
optname = provider.option_attrname(optname, optdict)
value = getattr(provider.config, optname, optdict)
value = format_option_value(optdict, value)
if value is optik_ext.NO_DEFAULT or not value:
value = self.NO_DEFAULT_VALUE
return option.help.replace(self.default_tag, str(value))
def _validate(value, optdict, name=''):
"""return a validated value for an option according to its type
optional argument name is only used for error message formatting
"""
try:
_type = optdict['type']
except KeyError:
# FIXME
return value
return _call_validator(_type, optdict, name, value)
convert = deprecated('[0.60] convert() was renamed _validate()')(_validate)
# format and output functions ##################################################
def comment(string):
"""return string as a comment"""
lines = [line.strip() for line in string.splitlines()]
return '# ' + ('%s# ' % os.linesep).join(lines)
def format_time(value):
if not value:
return '0'
if value != int(value):
return '%.2fs' % value
value = int(value)
nbmin, nbsec = divmod(value, 60)
if nbsec:
return '%ss' % value
nbhour, nbmin_ = divmod(nbmin, 60)
if nbmin_:
return '%smin' % nbmin
nbday, nbhour_ = divmod(nbhour, 24)
if nbhour_:
return '%sh' % nbhour
return '%sd' % nbday
def format_bytes(value):
if not value:
return '0'
if value != int(value):
return '%.2fB' % value
value = int(value)
prevunit = 'B'
for unit in ('KB', 'MB', 'GB', 'TB'):
next, remain = divmod(value, 1024)
if remain:
return '%s%s' % (value, prevunit)
prevunit = unit
value = next
return '%s%s' % (value, unit)
def format_option_value(optdict, value):
"""return the user input's value from a 'compiled' value"""
if isinstance(value, (list, tuple)):
value = ','.join(value)
elif isinstance(value, dict):
value = ','.join(['%s:%s' % (k, v) for k, v in value.items()])
elif hasattr(value, 'match'): # optdict.get('type') == 'regexp'
# compiled regexp
value = value.pattern
elif optdict.get('type') == 'yn':
value = value and 'yes' or 'no'
elif isinstance(value, string_types) and value.isspace():
value = "'%s'" % value
elif optdict.get('type') == 'time' and isinstance(value, (float, ) + integer_types):
value = format_time(value)
elif optdict.get('type') == 'bytes' and hasattr(value, '__int__'):
value = format_bytes(value)
return value
def ini_format_section(stream, section, options, encoding=None, doc=None):
"""format an options section using the INI format"""
encoding = _get_encoding(encoding, stream)
if doc:
print(_encode(comment(doc), encoding), file=stream)
print('[%s]' % section, file=stream)
ini_format(stream, options, encoding)
def ini_format(stream, options, encoding):
"""format options using the INI format"""
for optname, optdict, value in options:
value = format_option_value(optdict, value)
help = optdict.get('help')
if help:
help = normalize_text(help, line_len=79, indent='# ')
print(file=stream)
print(_encode(help, encoding), file=stream)
else:
print(file=stream)
if value is None:
print('#%s=' % optname, file=stream)
else:
value = _encode(value, encoding).strip()
if optdict.get('type') == 'string' and '\n' in value:
prefix = '\n '
value = prefix + prefix.join(value.split('\n'))
print('%s=%s' % (optname, value), file=stream)
format_section = ini_format_section
def rest_format_section(stream, section, options, encoding=None, doc=None):
"""format an options section using as ReST formatted output"""
encoding = _get_encoding(encoding, stream)
if section:
print('%s\n%s' % (section, "'"*len(section)), file=stream)
if doc:
print(_encode(normalize_text(doc, line_len=79, indent=''), encoding), file=stream)
print(file=stream)
for optname, optdict, value in options:
help = optdict.get('help')
print(':%s:' % optname, file=stream)
if help:
help = normalize_text(help, line_len=79, indent=' ')
print(_encode(help, encoding), file=stream)
if value:
value = _encode(format_option_value(optdict, value), encoding)
print(file=stream)
print(' Default: ``%s``' % value.replace("`` ", "```` ``"), file=stream)
# Options Manager ##############################################################
class OptionsManagerMixIn(object):
"""MixIn to handle a configuration from both a configuration file and
command line options
"""
def __init__(self, usage, config_file=None, version=None, quiet=0):
self.config_file = config_file
self.reset_parsers(usage, version=version)
# list of registered options providers
self.options_providers = []
# dictionary associating option name to checker
self._all_options = {}
self._short_options = {}
self._nocallback_options = {}
self._mygroups = dict()
# verbosity
self.quiet = quiet
self._maxlevel = 0
def reset_parsers(self, usage='', version=None):
# configuration file parser
self.cfgfile_parser = cp.ConfigParser()
# command line parser
self.cmdline_parser = optik_ext.OptionParser(usage=usage, version=version)
self.cmdline_parser.options_manager = self
self._optik_option_attrs = set(self.cmdline_parser.option_class.ATTRS)
def register_options_provider(self, provider, own_group=True):
"""register an options provider"""
assert provider.priority <= 0, "provider's priority can't be >= 0"
for i in range(len(self.options_providers)):
if provider.priority > self.options_providers[i].priority:
self.options_providers.insert(i, provider)
break
else:
self.options_providers.append(provider)
non_group_spec_options = [option for option in provider.options
if 'group' not in option[1]]
groups = getattr(provider, 'option_groups', ())
if own_group and non_group_spec_options:
self.add_option_group(provider.name.upper(), provider.__doc__,
non_group_spec_options, provider)
else:
for opt, optdict in non_group_spec_options:
self.add_optik_option(provider, self.cmdline_parser, opt, optdict)
for gname, gdoc in groups:
gname = gname.upper()
goptions = [option for option in provider.options
if option[1].get('group', '').upper() == gname]
self.add_option_group(gname, gdoc, goptions, provider)
def add_option_group(self, group_name, doc, options, provider):
"""add an option group including the listed options
"""
assert options
# add option group to the command line parser
if group_name in self._mygroups:
group = self._mygroups[group_name]
else:
group = optik_ext.OptionGroup(self.cmdline_parser,
title=group_name.capitalize())
self.cmdline_parser.add_option_group(group)
group.level = provider.level
self._mygroups[group_name] = group
# add section to the config file
if group_name != "DEFAULT":
self.cfgfile_parser.add_section(group_name)
# add provider's specific options
for opt, optdict in options:
self.add_optik_option(provider, group, opt, optdict)
def add_optik_option(self, provider, optikcontainer, opt, optdict):
if 'inputlevel' in optdict:
warn('[0.50] "inputlevel" in option dictionary for %s is deprecated,'
' use "level"' % opt, DeprecationWarning)
optdict['level'] = optdict.pop('inputlevel')
args, optdict = self.optik_option(provider, opt, optdict)
option = optikcontainer.add_option(*args, **optdict)
self._all_options[opt] = provider
self._maxlevel = max(self._maxlevel, option.level or 0)
def optik_option(self, provider, opt, optdict):
"""get our personal option definition and return a suitable form for
use with optik/optparse
"""
optdict = copy(optdict)
others = {}
if 'action' in optdict:
self._nocallback_options[provider] = opt
else:
optdict['action'] = 'callback'
optdict['callback'] = self.cb_set_provider_option
# default is handled here and *must not* be given to optik if you
# want the whole machinery to work
if 'default' in optdict:
if ('help' in optdict
and optdict.get('default') is not None
and not optdict['action'] in ('store_true', 'store_false')):
optdict['help'] += ' [current: %default]'
del optdict['default']
args = ['--' + str(opt)]
if 'short' in optdict:
self._short_options[optdict['short']] = opt
args.append('-' + optdict['short'])
del optdict['short']
# cleanup option definition dict before giving it to optik
for key in list(optdict.keys()):
if not key in self._optik_option_attrs:
optdict.pop(key)
return args, optdict
def cb_set_provider_option(self, option, opt, value, parser):
"""optik callback for option setting"""
if opt.startswith('--'):
# remove -- on long option
opt = opt[2:]
else:
# short option, get its long equivalent
opt = self._short_options[opt[1:]]
# trick since we can't set action='store_true' on options
if value is None:
value = 1
self.global_set_option(opt, value)
def global_set_option(self, opt, value):
"""set option on the correct option provider"""
self._all_options[opt].set_option(opt, value)
def generate_config(self, stream=None, skipsections=(), encoding=None):
"""write a configuration file according to the current configuration
into the given stream or stdout
"""
options_by_section = {}
sections = []
for provider in self.options_providers:
for section, options in provider.options_by_section():
if section is None:
section = provider.name
if section in skipsections:
continue
options = [(n, d, v) for (n, d, v) in options
if d.get('type') is not None]
if not options:
continue
if not section in sections:
sections.append(section)
alloptions = options_by_section.setdefault(section, [])
alloptions += options
stream = stream or sys.stdout
encoding = _get_encoding(encoding, stream)
printed = False
for section in sections:
if printed:
print('\n', file=stream)
format_section(stream, section.upper(), options_by_section[section],
encoding)
printed = True
def generate_manpage(self, pkginfo, section=1, stream=None):
"""write a man page for the current configuration into the given
stream or stdout
"""
self._monkeypatch_expand_default()
try:
optik_ext.generate_manpage(self.cmdline_parser, pkginfo,
section, stream=stream or sys.stdout,
level=self._maxlevel)
finally:
self._unmonkeypatch_expand_default()
# initialization methods ##################################################
def load_provider_defaults(self):
"""initialize configuration using default values"""
for provider in self.options_providers:
provider.load_defaults()
def load_file_configuration(self, config_file=None):
"""load the configuration from file"""
self.read_config_file(config_file)
self.load_config_file()
def read_config_file(self, config_file=None):
"""read the configuration file but do not load it (i.e. dispatching
values to each options provider)
"""
helplevel = 1
while helplevel <= self._maxlevel:
opt = '-'.join(['long'] * helplevel) + '-help'
if opt in self._all_options:
break # already processed
def helpfunc(option, opt, val, p, level=helplevel):
print(self.help(level))
sys.exit(0)
helpmsg = '%s verbose help.' % ' '.join(['more'] * helplevel)
optdict = {'action' : 'callback', 'callback' : helpfunc,
'help' : helpmsg}
provider = self.options_providers[0]
self.add_optik_option(provider, self.cmdline_parser, opt, optdict)
provider.options += ( (opt, optdict), )
helplevel += 1
if config_file is None:
config_file = self.config_file
if config_file is not None:
config_file = expanduser(config_file)
if config_file and exists(config_file):
parser = self.cfgfile_parser
parser.read([config_file])
# normalize sections'title
for sect, values in list(parser._sections.items()):
if not sect.isupper() and values:
parser._sections[sect.upper()] = values
elif not self.quiet:
msg = 'No config file found, using default configuration'
print(msg, file=sys.stderr)
return
def input_config(self, onlysection=None, inputlevel=0, stream=None):
"""interactively get configuration values by asking to the user and generate
a configuration file
"""
if onlysection is not None:
onlysection = onlysection.upper()
for provider in self.options_providers:
for section, option, optdict in provider.all_options():
if onlysection is not None and section != onlysection:
continue
if not 'type' in optdict:
# ignore action without type (callback, store_true...)
continue
provider.input_option(option, optdict, inputlevel)
# now we can generate the configuration file
if stream is not None:
self.generate_config(stream)
def load_config_file(self):
"""dispatch values previously read from a configuration file to each
options provider)
"""
parser = self.cfgfile_parser
for section in parser.sections():
for option, value in parser.items(section):
try:
self.global_set_option(option, value)
except (KeyError, OptionError):
# TODO handle here undeclared options appearing in the config file
continue
def load_configuration(self, **kwargs):
"""override configuration according to given parameters
"""
for opt, opt_value in kwargs.items():
opt = opt.replace('_', '-')
provider = self._all_options[opt]
provider.set_option(opt, opt_value)
def load_command_line_configuration(self, args=None):
"""override configuration according to command line parameters
return additional arguments
"""
self._monkeypatch_expand_default()
try:
if args is None:
args = sys.argv[1:]
else:
args = list(args)
(options, args) = self.cmdline_parser.parse_args(args=args)
for provider in self._nocallback_options.keys():
config = provider.config
for attr in config.__dict__.keys():
value = getattr(options, attr, None)
if value is None:
continue
setattr(config, attr, value)
return args
finally:
self._unmonkeypatch_expand_default()
# help methods ############################################################
def add_help_section(self, title, description, level=0):
"""add a dummy option section for help purpose """
group = optik_ext.OptionGroup(self.cmdline_parser,
title=title.capitalize(),
description=description)
group.level = level
self._maxlevel = max(self._maxlevel, level)
self.cmdline_parser.add_option_group(group)
def _monkeypatch_expand_default(self):
# monkey patch optik_ext to deal with our default values
try:
self.__expand_default_backup = optik_ext.HelpFormatter.expand_default
optik_ext.HelpFormatter.expand_default = expand_default
except AttributeError:
# python < 2.4: nothing to be done
pass
def _unmonkeypatch_expand_default(self):
# remove monkey patch
if hasattr(optik_ext.HelpFormatter, 'expand_default'):
# unpatch optik_ext to avoid side effects
optik_ext.HelpFormatter.expand_default = self.__expand_default_backup
def help(self, level=0):
"""return the usage string for available options """
self.cmdline_parser.formatter.output_level = level
self._monkeypatch_expand_default()
try:
return self.cmdline_parser.format_help()
finally:
self._unmonkeypatch_expand_default()
class Method(object):
"""used to ease late binding of default method (so you can define options
on the class using default methods on the configuration instance)
"""
def __init__(self, methname):
self.method = methname
self._inst = None
def bind(self, instance):
"""bind the method to its instance"""
if self._inst is None:
self._inst = instance
def __call__(self, *args, **kwargs):
assert self._inst, 'unbound method'
return getattr(self._inst, self.method)(*args, **kwargs)
# Options Provider #############################################################
class OptionsProviderMixIn(object):
"""Mixin to provide options to an OptionsManager"""
# those attributes should be overridden
priority = -1
name = 'default'
options = ()
level = 0
def __init__(self):
self.config = optik_ext.Values()
for option in self.options:
try:
option, optdict = option
except ValueError:
raise Exception('Bad option: %r' % option)
if isinstance(optdict.get('default'), Method):
optdict['default'].bind(self)
elif isinstance(optdict.get('callback'), Method):
optdict['callback'].bind(self)
self.load_defaults()
def load_defaults(self):
"""initialize the provider using default values"""
for opt, optdict in self.options:
action = optdict.get('action')
if action != 'callback':
# callback action have no default
default = self.option_default(opt, optdict)
if default is REQUIRED:
continue
self.set_option(opt, default, action, optdict)
def option_default(self, opt, optdict=None):
"""return the default value for an option"""
if optdict is None:
optdict = self.get_option_def(opt)
default = optdict.get('default')
if callable(default):
default = default()
return default
def option_attrname(self, opt, optdict=None):
"""get the config attribute corresponding to opt
"""
if optdict is None:
optdict = self.get_option_def(opt)
return optdict.get('dest', opt.replace('-', '_'))
option_name = deprecated('[0.60] OptionsProviderMixIn.option_name() was renamed to option_attrname()')(option_attrname)
def option_value(self, opt):
"""get the current value for the given option"""
return getattr(self.config, self.option_attrname(opt), None)
def set_option(self, opt, value, action=None, optdict=None):
"""method called to set an option (registered in the options list)
"""
if optdict is None:
optdict = self.get_option_def(opt)
if value is not None:
value = _validate(value, optdict, opt)
if action is None:
action = optdict.get('action', 'store')
if optdict.get('type') == 'named': # XXX need specific handling
optname = self.option_attrname(opt, optdict)
currentvalue = getattr(self.config, optname, None)
if currentvalue:
currentvalue.update(value)
value = currentvalue
if action == 'store':
setattr(self.config, self.option_attrname(opt, optdict), value)
elif action in ('store_true', 'count'):
setattr(self.config, self.option_attrname(opt, optdict), 0)
elif action == 'store_false':
setattr(self.config, self.option_attrname(opt, optdict), 1)
elif action == 'append':
opt = self.option_attrname(opt, optdict)
_list = getattr(self.config, opt, None)
if _list is None:
if isinstance(value, (list, tuple)):
_list = value
elif value is not None:
_list = []
_list.append(value)
setattr(self.config, opt, _list)
elif isinstance(_list, tuple):
setattr(self.config, opt, _list + (value,))
else:
_list.append(value)
elif action == 'callback':
optdict['callback'](None, opt, value, None)
else:
raise UnsupportedAction(action)
def input_option(self, option, optdict, inputlevel=99):
default = self.option_default(option, optdict)
if default is REQUIRED:
defaultstr = '(required): '
elif optdict.get('level', 0) > inputlevel:
return
elif optdict['type'] == 'password' or default is None:
defaultstr = ': '
else:
defaultstr = '(default: %s): ' % format_option_value(optdict, default)
print(':%s:' % option)
print(optdict.get('help') or option)
inputfunc = INPUT_FUNCTIONS[optdict['type']]
value = inputfunc(optdict, defaultstr)
while default is REQUIRED and not value:
print('please specify a value')
value = inputfunc(optdict, '%s: ' % option)
if value is None and default is not None:
value = default
self.set_option(option, value, optdict=optdict)
def get_option_def(self, opt):
"""return the dictionary defining an option given it's name"""
assert self.options
for option in self.options:
if option[0] == opt:
return option[1]
raise OptionError('no such option %s in section %r'
% (opt, self.name), opt)
def all_options(self):
"""return an iterator on available options for this provider
option are actually described by a 3-uple:
(section, option name, option dictionary)
"""
for section, options in self.options_by_section():
if section is None:
if self.name is None:
continue
section = self.name.upper()
for option, optiondict, value in options:
yield section, option, optiondict
def options_by_section(self):
"""return an iterator on options grouped by section
(section, [list of (optname, optdict, optvalue)])
"""
sections = {}
for optname, optdict in self.options:
sections.setdefault(optdict.get('group'), []).append(
(optname, optdict, self.option_value(optname)))
if None in sections:
yield None, sections.pop(None)
for section, options in sorted(sections.items()):
yield section.upper(), options
def options_and_values(self, options=None):
if options is None:
options = self.options
for optname, optdict in options:
yield (optname, optdict, self.option_value(optname))
# configuration ################################################################
class ConfigurationMixIn(OptionsManagerMixIn, OptionsProviderMixIn):
"""basic mixin for simple configurations which don't need the
manager / providers model
"""
def __init__(self, *args, **kwargs):
if not args:
kwargs.setdefault('usage', '')
kwargs.setdefault('quiet', 1)
OptionsManagerMixIn.__init__(self, *args, **kwargs)
OptionsProviderMixIn.__init__(self)
if not getattr(self, 'option_groups', None):
self.option_groups = []
for option, optdict in self.options:
try:
gdef = (optdict['group'].upper(), '')
except KeyError:
continue
if not gdef in self.option_groups:
self.option_groups.append(gdef)
self.register_options_provider(self, own_group=False)
def register_options(self, options):
"""add some options to the configuration"""
options_by_group = {}
for optname, optdict in options:
options_by_group.setdefault(optdict.get('group', self.name.upper()), []).append((optname, optdict))
for group, group_options in options_by_group.items():
self.add_option_group(group, None, group_options, self)
self.options += tuple(options)
def load_defaults(self):
OptionsProviderMixIn.load_defaults(self)
def __iter__(self):
return iter(self.config.__dict__.items())
def __getitem__(self, key):
try:
return getattr(self.config, self.option_attrname(key))
except (optik_ext.OptionValueError, AttributeError):
raise KeyError(key)
def __setitem__(self, key, value):
self.set_option(key, value)
def get(self, key, default=None):
try:
return getattr(self.config, self.option_attrname(key))
except (OptionError, AttributeError):
return default
class Configuration(ConfigurationMixIn):
"""class for simple configurations which don't need the
manager / providers model and prefer delegation to inheritance
configuration values are accessible through a dict like interface
"""
def __init__(self, config_file=None, options=None, name=None,
usage=None, doc=None, version=None):
if options is not None:
self.options = options
if name is not None:
self.name = name
if doc is not None:
self.__doc__ = doc
super(Configuration, self).__init__(config_file=config_file, usage=usage, version=version)
class OptionsManager2ConfigurationAdapter(object):
"""Adapt an option manager to behave like a
`logilab.common.configuration.Configuration` instance
"""
def __init__(self, provider):
self.config = provider
def __getattr__(self, key):
return getattr(self.config, key)
def __getitem__(self, key):
provider = self.config._all_options[key]
try:
return getattr(provider.config, provider.option_attrname(key))
except AttributeError:
raise KeyError(key)
def __setitem__(self, key, value):
self.config.global_set_option(self.config.option_attrname(key), value)
def get(self, key, default=None):
provider = self.config._all_options[key]
try:
return getattr(provider.config, provider.option_attrname(key))
except AttributeError:
return default
# other functions ##############################################################
def read_old_config(newconfig, changes, configfile):
"""initialize newconfig from a deprecated configuration file
possible changes:
* ('renamed', oldname, newname)
* ('moved', option, oldgroup, newgroup)
* ('typechanged', option, oldtype, newvalue)
"""
# build an index of changes
changesindex = {}
for action in changes:
if action[0] == 'moved':
option, oldgroup, newgroup = action[1:]
changesindex.setdefault(option, []).append((action[0], oldgroup, newgroup))
continue
if action[0] == 'renamed':
oldname, newname = action[1:]
changesindex.setdefault(newname, []).append((action[0], oldname))
continue
if action[0] == 'typechanged':
option, oldtype, newvalue = action[1:]
changesindex.setdefault(option, []).append((action[0], oldtype, newvalue))
continue
if action[0] in ('added', 'removed'):
continue # nothing to do here
raise Exception('unknown change %s' % action[0])
# build a config object able to read the old config
options = []
for optname, optdef in newconfig.options:
for action in changesindex.pop(optname, ()):
if action[0] == 'moved':
oldgroup, newgroup = action[1:]
optdef = optdef.copy()
optdef['group'] = oldgroup
elif action[0] == 'renamed':
optname = action[1]
elif action[0] == 'typechanged':
oldtype = action[1]
optdef = optdef.copy()
optdef['type'] = oldtype
options.append((optname, optdef))
if changesindex:
raise Exception('unapplied changes: %s' % changesindex)
oldconfig = Configuration(options=options, name=newconfig.name)
# read the old config
oldconfig.load_file_configuration(configfile)
# apply values reverting changes
changes.reverse()
done = set()
for action in changes:
if action[0] == 'renamed':
oldname, newname = action[1:]
newconfig[newname] = oldconfig[oldname]
done.add(newname)
elif action[0] == 'typechanged':
optname, oldtype, newvalue = action[1:]
newconfig[optname] = newvalue
done.add(optname)
for optname, optdef in newconfig.options:
if optdef.get('type') and not optname in done:
newconfig.set_option(optname, oldconfig[optname], optdict=optdef)
def merge_options(options, optgroup=None):
"""preprocess a list of options and remove duplicates, returning a new list
(tuple actually) of options.
Options dictionaries are copied to avoid later side-effect. Also, if
`otpgroup` argument is specified, ensure all options are in the given group.
"""
alloptions = {}
options = list(options)
for i in range(len(options)-1, -1, -1):
optname, optdict = options[i]
if optname in alloptions:
options.pop(i)
alloptions[optname].update(optdict)
else:
optdict = optdict.copy()
options[i] = (optname, optdict)
alloptions[optname] = optdict
if optgroup is not None:
alloptions[optname]['group'] = optgroup
return tuple(options)
|