VirtualMailManager/quotalimit.py
author Pascal Volk <neverseen@users.sourceforge.net>
Tue, 01 Nov 2011 23:37:06 +0000
branchv0.6.x
changeset 443 e2b9e3de2b51
parent 407 3162ff959375
child 450 fd4aa073015f
permissions -rw-r--r--
VMM/serviceset: Added @property ServiceSet.services -> dict.
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# -*- coding: UTF-8 -*-
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# Copyright (c) 2011, Pascal Volk
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# See COPYING for distribution information.
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"""
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    VirtualMailManager.quotalimit
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    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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    Virtual Mail Manager's QuotaLimit class to manage quota limits
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    for domains and accounts.
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"""
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from VirtualMailManager.constants import VMM_ERROR
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from VirtualMailManager.errors import VMMError
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from VirtualMailManager.pycompat import all
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_ = lambda msg: msg
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class QuotaLimit(object):
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    """Class to handle quota limit specific data."""
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    __slots__ = ('_dbh', '_qid', '_bytes', '_messages')
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    _kwargs = ('qid', 'bytes', 'messages')
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    def __init__(self, dbh, **kwargs):
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        """Create a new QuotaLimit instance.
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        Either the `qid` keyword or the `bytes` and `messages` keywords
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        must be specified.
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        Arguments:
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        `dbh` : pyPgSQL.PgSQL.Connection || psycopg2._psycopg.connection
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          A database connection for the database access.
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        Keyword arguments:
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        `qid` : int
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          The id of a quota limit
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        `bytes` : long
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          The quota limit in bytes.
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        `messages` : int
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          The quota limit in number of messages
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        """
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        self._dbh = dbh
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        self._qid = 0
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        self._bytes = 0
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        self._messages = 0
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        for key in kwargs.iterkeys():
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            if key not in self.__class__._kwargs:
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                raise ValueError('unrecognized keyword: %r' % key)
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        qid = kwargs.get('qid')
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        if qid is not None:
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            assert isinstance(qid, (int, long))
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            self._load_by_qid(qid)
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        else:
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            bytes_, msgs = kwargs.get('bytes'), kwargs.get('messages')
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            assert all(isinstance(i, (int, long)) for i in (bytes_, msgs))
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            if bytes_ < 0:
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                self._bytes = -bytes_
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            else:
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                self._bytes = bytes_
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            if msgs < 0:
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                self._messages = -msgs
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            else:
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                self._messages = msgs
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            self._load_by_limit()
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    @property
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    def bytes(self):
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        """Quota limit in bytes."""
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        return self._bytes
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    @property
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    def messages(self):
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        """Quota limit in number of messages."""
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        return self._messages
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    @property
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    def qid(self):
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        """The quota limit's unique ID."""
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        return self._qid
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    def __eq__(self, other):
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        if isinstance(other, self.__class__):
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            return self._qid == other._qid
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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._qid != other._qid
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        return NotImplemented
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    def _load_by_limit(self):
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        """Load the quota limit by limit values from the database."""
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        dbc = self._dbh.cursor()
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        dbc.execute('SELECT qid FROM quotalimit WHERE bytes = %s AND '
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                    'messages = %s', (self._bytes, self._messages))
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        res = dbc.fetchone()
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        dbc.close()
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        if res:
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            self._qid = res[0]
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        else:
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            self._save()
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    def _load_by_qid(self, qid):
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        """Load the quota limit by its unique ID from the database."""
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        dbc = self._dbh.cursor()
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        dbc.execute('SELECT bytes, messages FROM quotalimit WHERE qid = %s',
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                    (qid,))
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        res = dbc.fetchone()
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        dbc.close()
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        if not res:
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            raise VMMError(_(u'Unknown quota limit id specified.'), VMM_ERROR)
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        self._qid = qid
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        self._bytes, self._messages = res
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    def _save(self):
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        """Store a new quota limit in the database."""
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        dbc = self._dbh.cursor()
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        dbc.execute("SELECT nextval('quotalimit_id')")
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        self._qid = dbc.fetchone()[0]
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        dbc.execute('INSERT INTO quotalimit (qid, bytes, messages) VALUES '
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                    '(%s, %s, %s)', (self._qid, self._bytes, self._messages))
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        self._dbh.commit()
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        dbc.close()
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del _