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 collections import defaultdict

from dbworker import DBWorker

class Groups(DBWorker):

    """Groups are named collections of members, belonging to an owner."""

    def __init__(self, **params):

        DBWorker.__init__(self, **params)

        execute = self.execute

        execute(""" create table if not exists groups

                          ( owner  text,

                            name   text,

                            member text,

                            primary key (owner, name, member) ) """)

        execute(""" create index if not exists idx_groups_member

                    on groups(member) """)

    def group_names(self, owner):

        """List all group names belonging to owner."""

        q = "select distinct name from groups where owner = ?"

        self.execute(q, (owner,))

        return [r[0] for r in self.fetchall()]

    def group_dict(self, owner):

        """Return a dict mapping group names to member lists for owner."""

        q = "select name, member from groups where owner = ?"

        self.execute(q, (owner,))

        d = defaultdict(list)

        for group, member in self.fetchall():

            d[group].append(member)

        return d

    def group_add(self, owner, group, member):

        """Add a member to a group."""

        q = "insert or ignore into groups (owner, name, member) values (?, ?, ?)"

        self.execute(q, (owner, group, member))

    def group_addmany(self, owner, group, members):

        """Add members to a group."""

        q = "insert or ignore into groups (owner, name, member) values (?, ?, ?)"

        self.executemany(q, ((owner, group, member) for member in members))

    def group_remove(self, owner, group, member):

        """Remove a member from a group."""

        q = "delete from groups where owner = ? and name = ? and member = ?"

        self.execute(q, (owner, group, member))

    def group_delete(self, owner, group):

        """Delete a group."""

        q = "delete from groups where owner = ? and name = ?"

        self.execute(q, (owner, group))

    def group_destroy(self, owner):

        """Delete all groups belonging to owner."""

        q = "delete from groups where owner = ?"

        self.execute(q, (owner,))

    def group_members(self, owner, group):

        """Return the list of members of a group."""

        q = "select member from groups where owner = ? and name = ?"

        self.execute(q, (owner, group))

        return [r[0] for r in self.fetchall()]

    def group_check(self, owner, group, member):

        """Check if a member is in a group."""

        q = "select 1 from groups where owner = ? and name = ? and member = ?"

        self.execute(q, (group, member))

        return bool(self.fetchone())

    def group_parents(self, member):

        """Return all (owner, group) tuples that contain member."""

        q = "select owner, name from groups where member = ?"

        self.execute(q, (member,))

        return self.fetchall()