VirtualMailManager/transport.py
author martin f. krafft <madduck@madduck.net>
Fri, 13 Apr 2012 23:24:12 +0200
branchv0.6.x
changeset 532 2bb40aaef94e
parent 449 6826acb9b0a7
child 568 14abdd04ddf5
permissions -rw-r--r--
Modify userinfo output to indicate when domain defaults are displayed When Account instances reference NULL tid/qid/ssid, the data must come from the associated domain, and this should be indicated. For transport and services, this is easy to do as the string passed in the info dict can simply be modified. For quotalimit, however, another method must be used due to the CLI-side formatting. All approaches use a common formatter outsourced to the common.py file.
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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.transport
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    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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    Virtual Mail Manager's Transport class to manage the transport for
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    domains and accounts.
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"""
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from VirtualMailManager.pycompat import any
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_ = lambda msg: msg
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class Transport(object):
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    """A wrapper class that provides access to the transport table"""
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    __slots__ = ('_tid', '_transport', '_dbh')
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    def __init__(self, dbh, tid=None, transport=None):
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        """Creates a new Transport instance.
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        Either tid or transport must be specified. When both arguments
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        are given, tid will be used.
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        Keyword arguments:
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        dbh -- a pyPgSQL.PgSQL.connection
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        tid -- the id of a transport (int/long)
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        transport -- the value of the transport (str)
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        """
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        self._dbh = dbh
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        self._tid = 0
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        assert any((tid, transport))
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        if tid:
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            assert not isinstance(tid, bool) and isinstance(tid, (int, long))
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            self._load_by_id(tid)
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        else:
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            assert isinstance(transport, basestring)
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            self._transport = transport
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            self._load_by_name()
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    @property
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    def tid(self):
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        """The transport's unique ID."""
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        return self._tid
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    @property
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    def transport(self):
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        """The transport's value, ex: 'dovecot:'"""
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        return self._transport
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    def __eq__(self, other):
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        if isinstance(other, self.__class__):
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            return self._tid == other._tid
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        return NotImplemented
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    def __ne__(self, other):
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        if isinstance(other, self.__class__):
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            return self._tid != other._tid
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        return NotImplemented
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    def __str__(self):
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        return self._transport
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    def _load_by_id(self, tid):
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        """load a transport by its id from the database"""
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        dbc = self._dbh.cursor()
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        dbc.execute('SELECT transport FROM transport WHERE tid = %s', (tid,))
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        result = dbc.fetchone()
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        dbc.close()
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        if not result:
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            raise ValueError('Unknown transport id specified: %r' % tid)
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        self._transport = result[0]
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        self._tid = tid
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    def _load_by_name(self):
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        """Load a transport by its transport name from the database."""
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        dbc = self._dbh.cursor()
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        dbc.execute('SELECT tid FROM transport WHERE transport = %s',
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                    (self._transport,))
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        result = dbc.fetchone()
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        dbc.close()
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        if result:
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            self._tid = result[0]
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        else:
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            self._save()
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    def _save(self):
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        """Save the new transport in the database."""
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        dbc = self._dbh.cursor()
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        dbc.execute("SELECT nextval('transport_id')")
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        self._tid = dbc.fetchone()[0]
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        dbc.execute('INSERT INTO transport (tid, transport) VALUES (%s, %s)',
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                    (self._tid, self._transport))
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        self._dbh.commit()
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        dbc.close()
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del _