Synnefo » Pithos

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from dbworker import DBWorker

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

from sqlalchemy.sql import and_, select

from sqlalchemy.schema import Index

class Public(DBWorker):

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

    def __init__(self, **params):

        DBWorker.__init__(self, **params)

        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))

        self.public = Table('public', metadata, *columns, mysql_engine='InnoDB', sqlite_autoincrement=True)

        # place an index on path

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

        metadata.create_all(self.engine)

    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_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.xfeatures.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