Synnefo

# Copyright 2011-2012 GRNET S.A. All rights reserved.

#

# Redistribution and use in source and binary forms, with or

# without modification, are permitted provided that the following

# conditions are met:

#

#   1. Redistributions of source code must retain the above

#      copyright notice, this list of conditions and the following

#      disclaimer.

#

#   2. Redistributions in binary form must reproduce the above

#      copyright notice, this list of conditions and the following

#      disclaimer in the documentation and/or other materials

#      provided with the distribution.

#

# THIS SOFTWARE IS PROVIDED BY GRNET S.A. ``AS IS'' AND ANY EXPRESS

# OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED

# WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR

# PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL GRNET S.A OR

# CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,

# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT

# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF

# USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED

# AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT

# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN

# ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE

# POSSIBILITY OF SUCH DAMAGE.

#

# The views and conclusions contained in the software and

# documentation are those of the authors and should not be

# interpreted as representing official policies, either expressed

# or implied, of GRNET S.A.

from dbworker import DBWorker

from sqlalchemy import Table, Column, String, Integer, Boolean, MetaData

from sqlalchemy.sql import and_, select

from sqlalchemy.schema import Index

from sqlalchemy.exc import NoSuchTableError

def create_tables(engine):

    metadata = MetaData()

    columns = []

    columns.append(Column('public_id', Integer, primary_key=True))

    columns.append(Column('path', String(2048), nullable=False))

    columns.append(Column('active', Boolean, nullable=False, default=True))

    public = Table('public', metadata, *columns, mysql_engine='InnoDB',

                   sqlite_autoincrement=True)

    # place an index on path

    Index('idx_public_path', public.c.path, unique=True)

    metadata.create_all(engine)

    return metadata.sorted_tables

class Public(DBWorker):

    """Paths can be marked as public."""

    def __init__(self, **params):

        DBWorker.__init__(self, **params)

        try:

            metadata = MetaData(self.engine)

            self.public = Table('public', metadata, autoload=True)

        except NoSuchTableError:

            tables = create_tables(self.engine)

            map(lambda t: self.__setattr__(t.name, t), tables)

    def public_set(self, path):

        s = select([self.public.c.public_id])

        s = s.where(self.public.c.path == path)

        r = self.conn.execute(s)

        row = r.fetchone()

        r.close()

        if row:

            s = self.public.update().where(self.public.c.public_id == row[0])

            s = s.values(active=True)

        else:

            s = self.public.insert()

            s = s.values(path=path, active=True)

        r = self.conn.execute(s)

        r.close()

    def public_unset(self, path):

        s = self.public.update()

        s = s.where(self.public.c.path == path)

        s = s.values(active=False)

        r = self.conn.execute(s)

        r.close()

    def public_unset_bulk(self, paths):

        if not paths:

            return

        s = self.public.update()

        s = s.where(self.public.c.path.in_(paths))

        s = s.values(active=False)

        r = self.conn.execute(s)

        r.close()

    def public_get(self, path):

        s = select([self.public.c.public_id])

        s = s.where(and_(self.public.c.path == path,

                         self.public.c.active == True))

        r = self.conn.execute(s)

        row = r.fetchone()

        r.close()

        if row:

            return row[0]

        return None

    def public_list(self, prefix):

        s = select([self.public.c.path, self.public.c.public_id])

        s = s.where(self.public.c.path.like(

            self.escape_like(prefix) + '%', escape='\\'))

        s = s.where(self.public.c.active == True)

        r = self.conn.execute(s)

        rows = r.fetchall()

        r.close()

        return rows

    def public_path(self, public):

        s = select([self.public.c.path])

        s = s.where(and_(self.public.c.public_id == public,

                         self.public.c.active == True))

        r = self.conn.execute(s)

        row = r.fetchone()

        r.close()

        if row:

            return row[0]

        return None