root / snf-pithos-backend / pithos / backends / lib / sqlalchemy / quotaholder_serials.py @ dc7159be
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# Copyright 2011-2012 GRNET S.A. All rights reserved.
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#
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# Redistribution and use in source and binary forms, with or
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# without modification, are permitted provided that the following
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# conditions are met:
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#
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# 1. Redistributions of source code must retain the above
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# copyright notice, this list of conditions and the following
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# disclaimer.
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#
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# 2. Redistributions in binary form must reproduce the above
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# copyright notice, this list of conditions and the following
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# disclaimer in the documentation and/or other materials
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# provided with the distribution.
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#
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# THIS SOFTWARE IS PROVIDED BY GRNET S.A. ``AS IS'' AND ANY EXPRESS
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# OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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# WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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# PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL GRNET S.A OR
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# CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
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# USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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# AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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# ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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# POSSIBILITY OF SUCH DAMAGE.
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#
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# The views and conclusions contained in the software and
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# documentation are those of the authors and should not be
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# interpreted as representing official policies, either expressed
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# or implied, of GRNET S.A.
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from sqlalchemy import Table, Column, MetaData |
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from sqlalchemy.types import BigInteger |
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from sqlalchemy.sql import select |
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from sqlalchemy.exc import NoSuchTableError |
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from dbworker import DBWorker |
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def create_tables(engine): |
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metadata = MetaData() |
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columns = [] |
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columns.append(Column('serial', BigInteger, primary_key=True)) |
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Table('qh_serials', metadata, *columns, mysql_engine='InnoDB') |
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metadata.create_all(engine) |
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return metadata.sorted_tables
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class QuotaholderSerial(DBWorker): |
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"""QuotaholderSerial keeps track of quota holder serials.
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"""
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def __init__(self, **params): |
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DBWorker.__init__(self, **params)
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try:
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metadata = MetaData(self.engine)
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self.qh_serials = Table('qh_serials', metadata, autoload=True) |
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except NoSuchTableError:
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tables = create_tables(self.engine)
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map(lambda t: self.__setattr__(t.name, t), tables) |
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def get_lower(self, serial): |
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"""Return entries lower than serial."""
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s = select([self.qh_serials.c.serial])
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s = s.where(self.qh_serials.c.serial < serial)
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r = self.conn.execute(s)
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rows = r.fetchall() |
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r.close() |
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return rows
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def lookup(self, serials): |
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"""Return the registered serials."""
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if not serials: |
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return []
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s = select([self.qh_serials.c.serial])
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s = s.where(self.qh_serials.c.serial.in_(serials))
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r = self.conn.execute(s)
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rows = r.fetchall() |
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r.close() |
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return [row[0] for row in rows] |
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def insert_serial(self, serial): |
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"""Insert a serial.
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"""
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s = self.qh_serials.insert()
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r = self.conn.execute(s, serial=serial)
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r.close() |
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def insert_many(self, serials): |
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"""Insert multiple serials.
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"""
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r = self.conn.execute(
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self.qh_serials.insert(),
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list({'serial': s} for s in serials) |
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) |
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r.close() |
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def delete_many(self, serials): |
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if not serials: |
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return
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st = self.qh_serials.delete().where(
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self.qh_serials.c.serial.in_(serials)
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) |
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self.conn.execute(st).close()
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