VirtualMailManager/Config.py
author Pascal Volk <neverseen@users.sourceforge.net>
Tue, 26 Jan 2010 19:39:51 +0000
branchv0.6.x
changeset 177 ec2e1df8bb10
parent 175 b241272eb1bd
child 178 9480f2b15129
permissions -rw-r--r--
man/{,de/}man5: added a note about how to use default settings. man/de/man5: s/Abschnitt*/Sektion*/g
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# -*- coding: UTF-8 -*-
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# Copyright (c) 2007 - 2010, Pascal Volk
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# See COPYING for distribution information.
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"""vmm's configuration module for simplified configuration access.
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This module defines a few classes:
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``LazyConfig``
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    This class provides the following additonal methods
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    * `LazyConfig.pget()`
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        polymorphic getter which returns the value with the appropriate
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        type.
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    * `LazyConfig.dget()`
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        like *pget()*, but checks additonal for default values in
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        `LazyConfig._cfg`.
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    * `LazyConfig.set()`
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        like `RawConfigParser.set()`, but converts the new value to the
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        appropriate type/class and optional validates the new value.
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    * `LazyConfig.bool_new()`
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        converts data from raw_input into boolean values.
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    * `LazyConfig.get_boolean()`
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        like `RawConfigParser.getboolean()`, but doesn't fail on real
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        `bool` values.
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``Config``
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    The Config class used by vmm.
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``LazyConfigOption``
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    The class for the configuration objects in the ``Config`` class'
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    ``_cfg`` dictionary.
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"""
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from shutil import copy2
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from ConfigParser import (Error, MissingSectionHeaderError, NoOptionError,
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                          NoSectionError, ParsingError, RawConfigParser)
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from cStringIO import StringIO
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from __main__ import os, ENCODING, ERR, get_unicode, w_std
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from Exceptions import VMMConfigException
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class BadOptionError(Error):
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    """Raised when a option isn't in the format 'section.option'."""
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    pass
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class ConfigValueError(Error):
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    """Raised when creating or validating of new values fails."""
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    pass
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class NoDefaultError(Error):
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    """Raised when the requested option has no default value."""
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    def __init__(self, section, option):
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        Error.__init__(self, 'Option %r in section %r has no default value' %(
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                       option, section))
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class LazyConfig(RawConfigParser):
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    """The **lazy** derivate of the `RawConfigParser`.
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    There are two additional getters:
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    `LazyConfig.pget()`
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        The polymorphic getter, which returns a option's value with the
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        appropriate type.
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    `LazyConfig.dget()`
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        Like `LazyConfig.pget()`, but returns the option's default, from
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        `LazyConfig._cfg['sectionname']['optionname'].default`, if the
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        option is not configured in a ini-like configuration file.
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    `LazyConfig.set()` differs from ``RawConfigParser``'s ``set()`` method.
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    ``LazyConfig.set()`` takes the ``section`` and ``option`` arguments
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    combined to a single string in the form
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    "``section``\ **.**\ ``option``".
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    """
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    def __init__(self):
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        RawConfigParser.__init__(self)
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        self._modified = False
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        self._cfg = {
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            'sectionname': {
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                'optionname': LazyConfigOption(int, 1, self.getint)
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            }
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        }
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        """sample _cfg dictionary. Create your own in your derived class."""
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    def bool_new(self, value):
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        """Converts the string `value` into a `bool` and returns it.
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        | '1', 'on', 'yes' and 'true' will become ``True``
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        | '0', 'off', 'no' and 'false' will become ``False``
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        Throws a `ConfigValueError` for all other values, except ``bool``\ s.
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        """
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        if isinstance(value, bool):
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            return value
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        if value.lower() in self._boolean_states:
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            return self._boolean_states[value.lower()]
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        else:
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            raise ConfigValueError(_(u'Not a boolean: “%s”') % \
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                                   get_unicode(value))
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    def get_boolean(self, section, option):
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        # if the setting was not written to the configuration file, it may
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        # be still a boolean value - lets see
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        if self._modified:
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           tmp = self.get(section, option)
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           if isinstance(tmp, bool):
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               return tmp
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        return self.getboolean(section, option)
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    def __get_section_option(self, section_option):
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        """splits ``section_option`` (section\ **.**\ option) in two parts
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        and returns them as list ``[section, option]``, if:
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            * it likes the format of ``section_option``
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            * the ``section`` is known
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            * the ``option`` is known
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        Else one of the following exceptions will be thrown:
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            * `BadOptionError`
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            * `NoSectionError`
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            * `NoOptionError`
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        """ 
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        sect_opt = section_option.lower().split('.')
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        if len(sect_opt) != 2:# do we need a regexp to check the format?
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            raise BadOptionError(
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                        _(u'Bad format: “%s” - expected: section.option') % \
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                        get_unicode(section_option))
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        if not sect_opt[0] in self._cfg:
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            raise NoSectionError(sect_opt[0])
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        if not sect_opt[1] in self._cfg[sect_opt[0]]:
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            raise NoOptionError(sect_opt[1], sect_opt[0])
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        return sect_opt
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   141
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    def items(self, section):
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        """returns a ``list`` with key, value ``tuples`` from the given
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        ``section``: ``[(key, value), …]``"""
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        if section in self._sections:# check if the section was parsed
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            d2 = self._sections[section]
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        elif not section in self._cfg:
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            raise NoSectionError(section)
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        else:
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            return ((k, self._cfg[section][k].default) \
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                    for k in self._cfg[section].iterkeys())
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        # still here? Get defaults and merge defaults with configured setting
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        d = dict((k, self._cfg[section][k].default) \
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                 for k in self._cfg[section].iterkeys())
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        d.update(d2)
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        if '__name__' in d: del d['__name__']
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        return d.iteritems()
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   158
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    def dget(self, option):
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        """Returns the value of the `option`.
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        If the option could not be found in the configuration file, the
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        configured default value, from ``LazyConfig._cfg`` will be
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        returned.
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   165
        
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        Arguments:
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        `option` : string
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            the configuration option in the form
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            "``section``\ **.**\ ``option``"
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        Throws a `NoDefaultError`, if no default value was passed to
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        `LazyConfigOption.__init__()` for the `option`.
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        """
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        section, option = self.__get_section_option(option)
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        try:
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            return self._cfg[section][option].getter(section, option)
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        except (NoSectionError, NoOptionError):
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            if not self._cfg[section][option].default is None:
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                return self._cfg[section][option].default
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            else:
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                raise NoDefaultError(section, option)
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   183
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    def pget(self, option):
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        """Returns the value of the `option`."""
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        section, option = self.__get_section_option(option)
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        return self._cfg[section][option].getter(section, option)
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   188
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    def set(self, option, value):
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        """Set the value of an option.
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        Throws a ``ValueError`` if `value` couldn't be converted to
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        ``LazyConfigOption.cls``"""
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        section, option = self.__get_section_option(option)
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        val = self._cfg[section][option].cls(value)
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        if not self._cfg[section][option].validate is None:
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            val = self._cfg[section][option].validate(val)
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        if not RawConfigParser.has_section(self, section):
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            self.add_section(section)
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        RawConfigParser.set(self, section, option, val)
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        self._modified = True
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   202
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    def has_section(self, section):
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        """Checks if ``section`` is a known configuration section."""
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        return section.lower() in self._cfg 
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   206
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    def has_option(self, option):
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        """Checks if the option (section\ **.**\ option) is a known
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        configuration option."""
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        try:
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            self.__get_section_option(option)
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            return True
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        except(BadOptionError, NoSectionError, NoOptionError):
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            return False
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   217
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class LazyConfigOption(object):
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    """A simple container class for configuration settings.
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   ``LazyConfigOption`` instances are required by `LazyConfig` instances,
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   and instances of classes derived from ``LazyConfig``, like the
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   `Config` class.
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    """
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    __slots__ = ('cls', 'default', 'getter', 'validate')
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   226
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    def __init__(self, cls, default, getter, validate=None):
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        """Creates a new ``LazyConfigOption`` instance.
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   229
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        Arguments:
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        ``cls`` : type
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            The class/type of the option's value
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        ``default``
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            Default value of the option. Use ``None`` if the option should
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   236
            not have a default value.
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        ``getter`` : callable
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            A method's name of `RawConfigParser` and derived classes, to
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            get a option's value, e.g. `self.getint`.
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        ``validate`` : NoneType or a callable
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            None or any method, that takes one argument, in order to check
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            the value, when `LazyConfig.set()` is called.
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        """
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        self.cls = cls
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        """The class of the option's value e.g. `str`, `unicode` or `bool`"""
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        self.default = default
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        """The option's default value, may be ``None``"""
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        if callable(getter):
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            self.getter = getter
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            """The getter method to get the option's value"""
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   251
        else:
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            raise TypeError('getter has to be a callable, got a %r'\
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   253
                            % getter.__class__.__name__)
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        if validate is None or callable(validate):
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            self.validate = validate
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            """A method to validate the value"""
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        else:
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            raise TypeError('validate has to be callable or None, got a %r'\
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                            % validate.__class__.__name__)
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   261
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   262
class Config(LazyConfig):
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   263
    """This class is for reading and modifying vmm's configuration file."""
0
bb0aa2102206 Initial import @sf.net
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    def __init__(self, filename):
49
9bd033177377 * 'VirtualMailManager/Config.py'
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        """Creates a new Config instance
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        Arguments:
174
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   269
     
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        ``filename``
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            path to the configuration file
0
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        """
174
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        LazyConfig.__init__(self)
0
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        self.__cfgFileName = filename
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        self.__cfgFile = None
2
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        self.__missing = {}
174
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   277
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        LCO = LazyConfigOption
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        bool_t = self.bool_new
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        self._cfg = {
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            'account': {
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                'delete_directory': LCO(bool_t, False, self.get_boolean),
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                'directory_mode':   LCO(int,    448,   self.getint),
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                'disk_usage':       LCO(bool_t, False, self.get_boolean),
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   285
                'password_length':  LCO(int,    8,     self.getint),
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   286
                'random_password':  LCO(bool_t, False, self.get_boolean),
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                'imap' :            LCO(bool_t, True,  self.get_boolean),
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                'pop3' :            LCO(bool_t, True,  self.get_boolean),
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                'sieve':            LCO(bool_t, True,  self.get_boolean),
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                'smtp' :            LCO(bool_t, True,  self.get_boolean),
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   291
            },
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   292
            'bin': {
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                'dovecotpw': LCO(str, '/usr/sbin/dovecotpw', self.get,
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                                 self.exec_ok),
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                'du':        LCO(str, '/usr/bin/du', self.get, self.exec_ok),
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                'postconf':  LCO(str, '/usr/sbin/postconf', self.get,
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   297
                                 self.exec_ok),
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   298
            },
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   299
            'database': {
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                'host': LCO(str, 'localhost', self.get),
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                'name': LCO(str, 'mailsys',   self.get),
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                'pass': LCO(str, None,        self.get),
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                'user': LCO(str, None,        self.get),
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   304
            },
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   305
            'domain': {
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                'auto_postmaster':  LCO(bool_t, True,  self.get_boolean),
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                'delete_directory': LCO(bool_t, False, self.get_boolean),
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                'directory_mode':   LCO(int,    504,   self.getint),
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                'force_deletion':   LCO(bool_t, False, self.get_boolean),
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   310
            },
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   311
            'maildir': {
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   312
                'folders': LCO(str, 'Drafts:Sent:Templates:Trash', self.get),
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                'name':    LCO(str, 'Maildir',                     self.get),
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   314
            },
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   315
            'misc': {
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                'base_directory':  LCO(str, '/srv/mail', self.get, self.is_dir),
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                'dovecot_version': LCO(int, 12,          self.getint),
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   318
                'gid_mail':        LCO(int, 8,           self.getint),
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   319
                'password_scheme': LCO(str, 'CRAM-MD5',  self.get,
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   320
                                       self.known_scheme),
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   321
                'transport':       LCO(str, 'dovecot:',  self.get),
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   322
            },
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   323
            'config': {'done': LCO(bool_t, False, self.get_boolean)}
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   324
        }
0
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   326
    def load(self):
120
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   327
        """Loads the configuration, read only.
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   328
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   329
        Raises a VMMConfigException if the configuration syntax is invalid.
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   330
        """
0
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        try:
174
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   332
            self.__cfgFile = open(self.__cfgFileName, 'r')
48
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diff changeset
   333
            self.readfp(self.__cfgFile)
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diff changeset
   334
        except (MissingSectionHeaderError, ParsingError), e:
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   335
            raise VMMConfigException(str(e), ERR.CONF_ERROR)
175
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   336
        finally:
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   337
            if not self.__cfgFile is None and not self.__cfgFile.closed:
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   338
                self.__cfgFile.close()
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   339
2
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   340
    def check(self):
120
928659c8ee9f Comments updated.
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   341
        """Performs a configuration check.
128
cf8116625866 Converted VirtualMailManager and Postconf to new-style classes.
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diff changeset
   342
120
928659c8ee9f Comments updated.
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   343
        Raises a VMMConfigException if the check fails.
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   344
        """
174
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   345
        if not self.__chkCfg():
2
9b39f828aa8a * 'VirtualMailManager/Exceptions.py'
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   346
            errmsg = StringIO()
174
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   347
            errmsg.write(_(u'Missing options, which have no default value.\n'))
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   348
            errmsg.write(_(u'Using configuration file: %s\n') %\
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   349
                         self.__cfgFileName)
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diff changeset
   350
            for section, options in self.__missing.iteritems():
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   351
                errmsg.write(_(u'* Section: %s\n') % section)
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   352
                for option in options:
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   353
                    errmsg.write((u'    %s\n') % option)
48
0d5f58f8b8f5 * 'VirtualMailManager/Exceptions.py'
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diff changeset
   354
            raise VMMConfigException(errmsg.getvalue(), ERR.CONF_ERROR)
2
9b39f828aa8a * 'VirtualMailManager/Exceptions.py'
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diff changeset
   355
0
bb0aa2102206 Initial import @sf.net
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   356
    def getsections(self):
174
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   357
        """Returns a generator object for all configurable sections."""
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   358
        return (s for s in self._cfg.iterkeys() if s != 'config')
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diff changeset
   359
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diff changeset
   360
    def is_dir(self, path):
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diff changeset
   361
        """Checks if ``path`` is a directory.
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diff changeset
   362
        
974bafa59330 VMM/Config: reworked configuration handling.
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   363
        Throws a `ConfigValueError` if ``path`` is not a directory.
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diff changeset
   364
        """
974bafa59330 VMM/Config: reworked configuration handling.
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diff changeset
   365
        path = self.__expand_path(path)
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diff changeset
   366
        if not os.path.isdir(path):
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diff changeset
   367
            raise ConfigValueError(_(u'“%s” is not a directory') % \
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diff changeset
   368
                                   get_unicode(path))
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diff changeset
   369
        return path
0
bb0aa2102206 Initial import @sf.net
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diff changeset
   370
174
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diff changeset
   371
    def exec_ok(self, binary):
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diff changeset
   372
        """Checks if the ``binary`` exists and if it is executable.
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diff changeset
   373
        
974bafa59330 VMM/Config: reworked configuration handling.
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diff changeset
   374
        Throws a `ConfigValueError` if the ``binary`` isn't a file or is
974bafa59330 VMM/Config: reworked configuration handling.
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diff changeset
   375
        not executable.
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diff changeset
   376
        """
974bafa59330 VMM/Config: reworked configuration handling.
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parents: 173
diff changeset
   377
        binary = self.__expand_path(binary)
974bafa59330 VMM/Config: reworked configuration handling.
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parents: 173
diff changeset
   378
        if not os.path.isfile(binary):
974bafa59330 VMM/Config: reworked configuration handling.
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diff changeset
   379
            raise ConfigValueError(_(u'“%s” is not a file') % \
974bafa59330 VMM/Config: reworked configuration handling.
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parents: 173
diff changeset
   380
                                   get_unicode(binary))
974bafa59330 VMM/Config: reworked configuration handling.
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parents: 173
diff changeset
   381
        if not os.access(binary, os.X_OK):
974bafa59330 VMM/Config: reworked configuration handling.
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parents: 173
diff changeset
   382
            raise ConfigValueError(_(u'File is not executable: “%s”') % \
974bafa59330 VMM/Config: reworked configuration handling.
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parents: 173
diff changeset
   383
                                   get_unicode(binary))
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diff changeset
   384
        return binary
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parents: 173
diff changeset
   385
974bafa59330 VMM/Config: reworked configuration handling.
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parents: 173
diff changeset
   386
    def known_scheme(self, scheme):
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parents: 173
diff changeset
   387
        """Converts ``scheme`` to upper case and checks if is known by
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parents: 173
diff changeset
   388
        Dovecot (listed in VirtualMailManager.SCHEMES).
974bafa59330 VMM/Config: reworked configuration handling.
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parents: 173
diff changeset
   389
        
974bafa59330 VMM/Config: reworked configuration handling.
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parents: 173
diff changeset
   390
        Throws a `ConfigValueError` if the scheme is not listed in
974bafa59330 VMM/Config: reworked configuration handling.
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parents: 173
diff changeset
   391
        VirtualMailManager.SCHEMES.
974bafa59330 VMM/Config: reworked configuration handling.
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diff changeset
   392
        """
974bafa59330 VMM/Config: reworked configuration handling.
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parents: 173
diff changeset
   393
        scheme = scheme.upper()
974bafa59330 VMM/Config: reworked configuration handling.
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diff changeset
   394
        # TODO: VMM.SCHEMES
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diff changeset
   395
974bafa59330 VMM/Config: reworked configuration handling.
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diff changeset
   396
    def unicode(self, section, option):
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parents: 173
diff changeset
   397
        """Returns the value of the ``option`` from ``section``, converted
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diff changeset
   398
        to Unicode.
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diff changeset
   399
        """
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diff changeset
   400
        return get_unicode(self.get(section, option))
69
0c124160a991 * 'VirtualMailManager/VirtualMailManager.py'
Pascal Volk <neverseen@users.sourceforge.net>
parents: 68
diff changeset
   401
0
bb0aa2102206 Initial import @sf.net
Pascal Volk <neverseen@users.sourceforge.net>
parents:
diff changeset
   402
    def configure(self, sections):
120
928659c8ee9f Comments updated.
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parents: 113
diff changeset
   403
        """Interactive method for configuring all options in the given sections
0
bb0aa2102206 Initial import @sf.net
Pascal Volk <neverseen@users.sourceforge.net>
parents:
diff changeset
   404
120
928659c8ee9f Comments updated.
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parents: 113
diff changeset
   405
        Arguments:
928659c8ee9f Comments updated.
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diff changeset
   406
        sections -- list of strings with section names
0
bb0aa2102206 Initial import @sf.net
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diff changeset
   407
        """
174
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diff changeset
   408
        input_fmt = _(u'Enter new value for option %(option)s \
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parents: 173
diff changeset
   409
[%(current_value)s]: ')
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parents: 173
diff changeset
   410
        failures = 0
974bafa59330 VMM/Config: reworked configuration handling.
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parents: 173
diff changeset
   411
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parents: 173
diff changeset
   412
        # if config.done == false (default at 1st run),
0
bb0aa2102206 Initial import @sf.net
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parents:
diff changeset
   413
        # then set changes true
174
974bafa59330 VMM/Config: reworked configuration handling.
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diff changeset
   414
        if not self.dget('config.done'):
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diff changeset
   415
            self._modified = True
112
d1f345f91e1c Hopefully the final UnicodeDecodeError fix for the Config class
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parents: 103
diff changeset
   416
        w_std(_(u'Using configuration file: %s\n') % self.__cfgFileName)
0
bb0aa2102206 Initial import @sf.net
Pascal Volk <neverseen@users.sourceforge.net>
parents:
diff changeset
   417
        for s in sections:
174
974bafa59330 VMM/Config: reworked configuration handling.
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diff changeset
   418
            w_std(_(u'* Config section: “%s”') % s )
0
bb0aa2102206 Initial import @sf.net
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parents:
diff changeset
   419
            for opt, val in self.items(s):
174
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diff changeset
   420
                failures = 0
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diff changeset
   421
                while True:
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diff changeset
   422
                    newval = raw_input(input_fmt.encode(ENCODING,'replace') %{
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parents: 173
diff changeset
   423
                                       'option': opt, 'current_value': val})
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diff changeset
   424
                    if newval and newval != val:
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diff changeset
   425
                        try:
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   426
                            self.set('%s.%s' % (s, opt), newval)
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diff changeset
   427
                            break
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diff changeset
   428
                        except (ValueError, ConfigValueError), e:
974bafa59330 VMM/Config: reworked configuration handling.
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diff changeset
   429
                            w_std(_(u'Warning: %s') % e)
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diff changeset
   430
                            failures += 1
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diff changeset
   431
                            if failures > 2:
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diff changeset
   432
                                raise VMMConfigException(
974bafa59330 VMM/Config: reworked configuration handling.
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diff changeset
   433
                                    _(u'Too many failures - try again later.'),
974bafa59330 VMM/Config: reworked configuration handling.
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parents: 173
diff changeset
   434
                                    ERR.VMM_TOO_MANY_FAILURES)
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parents: 173
diff changeset
   435
                    else:
974bafa59330 VMM/Config: reworked configuration handling.
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diff changeset
   436
                        break
0
bb0aa2102206 Initial import @sf.net
Pascal Volk <neverseen@users.sourceforge.net>
parents:
diff changeset
   437
            print
174
974bafa59330 VMM/Config: reworked configuration handling.
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diff changeset
   438
        if self._modified:
0
bb0aa2102206 Initial import @sf.net
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parents:
diff changeset
   439
            self.__saveChanges()
bb0aa2102206 Initial import @sf.net
Pascal Volk <neverseen@users.sourceforge.net>
parents:
diff changeset
   440
bb0aa2102206 Initial import @sf.net
Pascal Volk <neverseen@users.sourceforge.net>
parents:
diff changeset
   441
    def __saveChanges(self):
bb0aa2102206 Initial import @sf.net
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parents:
diff changeset
   442
        """Writes changes to the configuration file."""
174
974bafa59330 VMM/Config: reworked configuration handling.
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diff changeset
   443
        self.set('config.done', True)
0
bb0aa2102206 Initial import @sf.net
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parents:
diff changeset
   444
        copy2(self.__cfgFileName, self.__cfgFileName+'.bak')
174
974bafa59330 VMM/Config: reworked configuration handling.
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diff changeset
   445
        self.__cfgFile = open(self.__cfgFileName, 'w')
0
bb0aa2102206 Initial import @sf.net
Pascal Volk <neverseen@users.sourceforge.net>
parents:
diff changeset
   446
        self.write(self.__cfgFile)
bb0aa2102206 Initial import @sf.net
Pascal Volk <neverseen@users.sourceforge.net>
parents:
diff changeset
   447
        self.__cfgFile.close()
bb0aa2102206 Initial import @sf.net
Pascal Volk <neverseen@users.sourceforge.net>
parents:
diff changeset
   448
174
974bafa59330 VMM/Config: reworked configuration handling.
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diff changeset
   449
    def __chkCfg(self):
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diff changeset
   450
        """Checks all section's options for settings w/o default values.
974bafa59330 VMM/Config: reworked configuration handling.
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parents: 173
diff changeset
   451
        
974bafa59330 VMM/Config: reworked configuration handling.
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diff changeset
   452
        Returns ``True`` if everything is fine, else ``False``."""
2
9b39f828aa8a * 'VirtualMailManager/Exceptions.py'
Pascal Volk <neverseen@users.sourceforge.net>
parents: 0
diff changeset
   453
        errors = False
174
974bafa59330 VMM/Config: reworked configuration handling.
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parents: 173
diff changeset
   454
        for section in self._cfg.iterkeys():
974bafa59330 VMM/Config: reworked configuration handling.
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parents: 173
diff changeset
   455
            missing = []
974bafa59330 VMM/Config: reworked configuration handling.
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parents: 173
diff changeset
   456
            for option, value in self._cfg[section].iteritems():
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parents: 173
diff changeset
   457
                if (value.default is None
974bafa59330 VMM/Config: reworked configuration handling.
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parents: 173
diff changeset
   458
                and not RawConfigParser.has_option(self, section, option)):
974bafa59330 VMM/Config: reworked configuration handling.
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parents: 173
diff changeset
   459
                    missing.append(option)
974bafa59330 VMM/Config: reworked configuration handling.
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parents: 173
diff changeset
   460
                    errors = True
974bafa59330 VMM/Config: reworked configuration handling.
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parents: 173
diff changeset
   461
            if len(missing):
974bafa59330 VMM/Config: reworked configuration handling.
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parents: 173
diff changeset
   462
                self.__missing[section] = missing
2
9b39f828aa8a * 'VirtualMailManager/Exceptions.py'
Pascal Volk <neverseen@users.sourceforge.net>
parents: 0
diff changeset
   463
        return not errors
0
bb0aa2102206 Initial import @sf.net
Pascal Volk <neverseen@users.sourceforge.net>
parents:
diff changeset
   464
174
974bafa59330 VMM/Config: reworked configuration handling.
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parents: 173
diff changeset
   465
    def __expand_path(self, path):
974bafa59330 VMM/Config: reworked configuration handling.
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parents: 173
diff changeset
   466
        """Expands paths, starting with ``.`` or ``~``, to an absolute path."""
974bafa59330 VMM/Config: reworked configuration handling.
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parents: 173
diff changeset
   467
        if path.startswith('.'):
974bafa59330 VMM/Config: reworked configuration handling.
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parents: 173
diff changeset
   468
            return os.path.abspath(path)
974bafa59330 VMM/Config: reworked configuration handling.
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parents: 173
diff changeset
   469
        if path.startswith('~'):
974bafa59330 VMM/Config: reworked configuration handling.
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parents: 173
diff changeset
   470
            return os.path.expanduser(path)
974bafa59330 VMM/Config: reworked configuration handling.
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parents: 173
diff changeset
   471
        return path