VirtualMailManager/ext/postconf.py
author martin f. krafft <madduck@madduck.net>
Sat, 07 Apr 2012 00:45:57 +0200
branchv0.6.x
changeset 492 e5c2b3647971
parent 422 33a45e4c80c4
child 568 14abdd04ddf5
permissions -rw-r--r--
Modify address check query to obtain well-defined result The way in which UNION does not yield the desired result, because (a) UNION merges results and (b) the result order is undefined. This patch changes the query to select the counts as columns and hence provides a well-defined order.
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# -*- coding: UTF-8 -*-
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# Copyright (c) 2008 - 2011, Pascal Volk
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# See COPYING for distribution information.
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"""
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    VirtualMailManager.ext.postconf
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    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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    Wrapper class for Postfix's postconf.
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    Postconf instances can be used to read actual values of configuration
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    parameters or edit the value of a configuration parameter.
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    postconf.read(parameter) -> value
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    postconf.edit(parameter, value)
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"""
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import re
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from subprocess import Popen, PIPE
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from VirtualMailManager.errors import VMMError
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from VirtualMailManager.constants import VMM_ERROR
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_ = lambda msg: msg
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class Postconf(object):
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    """Wrapper class for Postfix's postconf."""
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    __slots__ = ('_bin', '_val')
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    _parameter_re = re.compile(r'^\w+$')
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    _variables_re = re.compile(r'\$\b\w+\b')
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    def __init__(self, postconf_bin):
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        """Creates a new Postconf instance.
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        Argument:
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        `postconf_bin` : str
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          absolute path to the Postfix postconf binary.
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        """
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        self._bin = postconf_bin
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        self._val = ''
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    def edit(self, parameter, value):
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        """Set the `parameter`'s value to `value`.
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        Arguments:
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        `parameter` : str
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          the name of a Postfix configuration parameter
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        `value` : str
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          the parameter's new value.
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        """
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        self._check_parameter(parameter)
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        stderr = Popen((self._bin, '-e', parameter + '=' + str(value)),
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                       stderr=PIPE).communicate()[1]
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        if stderr:
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            raise VMMError(stderr.strip(), VMM_ERROR)
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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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        Arguments:
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        `parameter` : str
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          the name of a Postfix configuration parameter.
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        `expand_vars` : bool
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          indicates if variables should be expanded or not, default True
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        """
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        self._check_parameter(parameter)
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        self._val = self._read(parameter)
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        if expand_vars:
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            self._expand_vars()
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        return self._val
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    def _check_parameter(self, parameter):
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        """Check that the `parameter` looks like a configuration parameter.
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        If not, a VMMError will be raised."""
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        if not self.__class__._parameter_re.match(parameter):
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            raise VMMError(_(u"The value '%s' does not look like a valid "
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                             u"postfix configuration parameter name.") %
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                           parameter, VMM_ERROR)
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    def _expand_vars(self):
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        """Expand the $variables in self._val to their values."""
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        while True:
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            pvars = set(self.__class__._variables_re.findall(self._val))
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            if not pvars:
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                break
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            if len(pvars) > 1:
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                self._expand_multi_vars(self._read_multi(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 _expand_multi_vars(self, old_new):
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        """Replace all $vars in self._val with their values."""
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        for old, new in old_new.iteritems():
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            self._val = self._val.replace('$' + old, new)
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    def _read(self, parameter):
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        """Ask postconf for the value of a single configuration parameter."""
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        stdout, stderr = Popen([self._bin, '-h', parameter], stdout=PIPE,
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                               stderr=PIPE).communicate()
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        if stderr:
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            raise VMMError(stderr.strip(), VMM_ERROR)
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        return stdout.strip()
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    def _read_multi(self, parameters):
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        """Ask postconf for multiple configuration parameters. Returns a dict
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        parameter: value items."""
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        cmd = [self._bin]
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        cmd.extend(parameter[1:] for parameter in parameters)
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        stdout, stderr = Popen(cmd, stdout=PIPE, stderr=PIPE).communicate()
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        if stderr:
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            raise VMMError(stderr.strip(), VMM_ERROR)
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        par_val = {}
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        for line in stdout.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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del _