VirtualMailManager/ext/Postconf.py
author Pascal Volk <neverseen@users.sourceforge.net>
Wed, 24 Feb 2010 04:01:48 +0000
branchv0.6.x
changeset 212 77ac6f572855
parent 185 6e1ef32fbd82
child 216 0c8c053b451c
permissions -rw-r--r--
doc: extended documentation.
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# -*- coding: UTF-8 -*-
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# Copyright (c) 2008 - 2010, Pascal Volk
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# See COPYING for distribution information.
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"""A small - r/o - wrapper class for Postfix' postconf."""
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import re
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from subprocess import Popen, PIPE
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import VirtualMailManager.constants.ERROR as ERR
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from VirtualMailManager.Exceptions import VMMException
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RE_PC_PARAMS = """^\w+$"""
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RE_PC_VARIABLES = r"""\$\b\w+\b"""
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class Postconf(object):
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    __slots__ = ('__bin', '__val', '__varFinder')
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    def __init__(self, postconf_bin):
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        """Creates a new Postconf instance.
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        Keyword arguments:
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        postconf_bin -- absolute path to the Postfix postconf binary (str)
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        """
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        self.__bin = postconf_bin
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        self.__val = ''
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        self.__varFinder = re.compile(RE_PC_VARIABLES)
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    def read(self, parameter, expand_vars=True):
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        """Returns the parameters value.
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        If expand_vars is True (default), all variables in the value will be
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        expanded:
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        e.g. mydestination -> mail.example.com, localhost.example.com, localhost
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        Otherwise the value may contain one or more variables.
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        e.g. mydestination -> $myhostname, localhost.$mydomain, localhost
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        Keyword arguments:
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        parameter -- the name of a Postfix configuration parameter (str)
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        expand_vars -- default True (bool)
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        """
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        if not re.match(RE_PC_PARAMS, parameter):
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            raise VMMException(_(u'The value “%s” doesn\'t look like a valid\
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 postfix configuration parameter name.') % parameter, ERR.VMM_ERROR)
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        self.__val = self.__read(parameter)
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        if expand_vars:
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            self.__expandVars()
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        return self.__val
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    def __expandVars(self):
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        while True:
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            pvars = set(self.__varFinder.findall(self.__val))
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            pvars_len = len(pvars)
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            if pvars_len < 1:
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                break
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            if pvars_len > 1:
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                self.__expandMultiVars(self.__readMulti(pvars))
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                continue
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            pvars = pvars.pop()
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            self.__val = self.__val.replace(pvars, self.__read(pvars[1:]))
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    def __expandMultiVars(self, old_new):
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        for old, new in old_new.items():
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            self.__val = self.__val.replace('$'+old, new)
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    def __read(self, parameter):
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        out, err = Popen([self.__bin, '-h', parameter], stdout=PIPE,
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                stderr=PIPE).communicate()
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        if len(err):
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            raise VMMException(err.strip(), ERR.VMM_ERROR)
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        return out.strip()
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    def __readMulti(self, parameters):
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        cmd = [self.__bin]
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        for parameter in parameters:
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            cmd.append(parameter[1:])
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        out, err = Popen(cmd, stdout=PIPE, stderr=PIPE).communicate()
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        if len(err):
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            raise VMMException(err.strip(), ERR.VMM_ERROR)
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        par_val = {}
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        for line in out.splitlines():
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            par, val = line.split(' = ')
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            par_val[par] = val
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        return par_val
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