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# Copyright (C) 2011-2014 Aleksey Lim
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
import os
import logging
from os.path import exists, join, abspath
from sugar_network import toolkit
from sugar_network.db.directory import Directory
from sugar_network.db.index import IndexWriter
from sugar_network.db.blobs import Blobs
from sugar_network.toolkit.coroutine import this
from sugar_network.toolkit import http, coroutine, enforce
_logger = logging.getLogger('db.volume')
class Volume(dict):
_flush_pool = []
def __init__(self, root, resources, index_class=None):
Volume._flush_pool.append(self)
self.resources = {}
self.mute = False
self._populators = coroutine.Pool()
if index_class is None:
index_class = IndexWriter
self._root = abspath(root)
_logger.info('Opening %r volume', self._root)
if not exists(root):
os.makedirs(root)
self._index_class = index_class
self.seqno = toolkit.Seqno(join(self._root, 'var', 'seqno'))
self.blobs = Blobs(root, self.seqno)
for document in resources:
if isinstance(document, basestring):
name = document.split('.')[-1]
else:
name = document.__name__.lower()
self.resources[name] = document
@property
def root(self):
return self._root
@property
def empty(self):
for directory in self.values():
if not directory.empty:
return False
return True
@property
def has_seqno(self):
for directory in self.values():
if directory.has_seqno:
return True
return False
@property
def has_noseqno(self):
for directory in self.values():
if directory.has_noseqno:
return True
return False
def close(self):
"""Close operations with the server."""
_logger.info('Closing documents in %r', self._root)
self._populators.kill()
while self:
__, cls = self.popitem()
cls.close()
def populate(self):
for resource in self.resources:
self.__getitem__(resource)
for __ in self.blobs.populate():
pass
def broadcast(self, event):
if not self.mute:
if event['event'] == 'commit':
this.broadcast(event)
else:
this.localcast(event)
def __enter__(self):
return self
def __exit__(self, exc_type, exc_value, traceback):
self.close()
def __getitem__(self, name):
dir_ = self.get(name)
if dir_ is None:
enforce(name in self.resources, http.BadRequest,
'Unknown %r resource', name)
resource = self.resources[name]
if isinstance(resource, basestring):
mod = __import__(resource, fromlist=[name])
cls = getattr(mod, name.capitalize())
else:
cls = resource
dir_ = Directory(self._root, cls, self._index_class, self.seqno,
self.broadcast)
self._populators.spawn(self._populate, dir_)
self[name] = dir_
return dir_
def _populate(self, directory):
for __ in directory.populate():
coroutine.dispatch()
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