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# -*- coding: utf-8 *-*
#
# Copyright 2011-2012 Canonical Ltd.
#
# This program is free software: you can redistribute it and/or modify it
# under the terms of the GNU General Public License version 3, as published
# by the Free Software Foundation.
#
# This program is distributed in the hope that it will be useful, but
# WITHOUT ANY WARRANTY; without even the implied warranties of
# MERCHANTABILITY, SATISFACTORY QUALITY, 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/>.
#
# In addition, as a special exception, the copyright holders give
# permission to link the code of portions of this program with the
# OpenSSL library under certain conditions as described in each
# individual source file, and distribute linked combinations
# including the two.
# You must obey the GNU General Public License in all respects
# for all of the code used other than OpenSSL. If you modify
# file(s) with this exception, you may extend this exception to your
# version of the file(s), but you are not obligated to do so. If you
# do not wish to do so, delete this exception statement from your
# version. If you delete this exception statement from all source
# files in the program, then also delete it here.
"""Filesystem monitors per platform."""
import logging
import sys
from twisted.internet import defer
DEFAULT_MONITOR = 'default'
logger = logging.getLogger(
'ubuntuone.SyncDaemon.platform.filesystem_notifications.monitor')
class NoAvailableMonitorError(Exception):
"""Raised if there are no available monitors in the system."""
if sys.platform == 'win32':
from magicicadaclient.platform.filesystem_notifications.monitor import (
common,
windows,
)
FILEMONITOR_IDS = {
DEFAULT_MONITOR: common.FilesystemMonitor,
}
ACTIONS = windows.ACTIONS
elif sys.platform == 'darwin':
from magicicadaclient.platform.filesystem_notifications.monitor import darwin
from magicicadaclient.platform.filesystem_notifications.monitor import (
common,
)
FILEMONITOR_IDS = {
DEFAULT_MONITOR: darwin.fsevents_daemon.FilesystemMonitor,
'macfsevents': common.FilesystemMonitor,
}
ACTIONS = darwin.fsevents_client.ACTIONS
else:
from magicicadaclient.platform.filesystem_notifications.monitor import (
linux,
)
FILEMONITOR_IDS = {
DEFAULT_MONITOR: linux.FilesystemMonitor,
}
# mantain old API
FilesystemMonitor = FILEMONITOR_IDS[DEFAULT_MONITOR]
@defer.inlineCallbacks
def get_filemonitor_class(monitor_id=None):
"""Return the class to be used."""
logger.debug('File monitor ids for platform "%s" are "%s"', sys.platform,
FILEMONITOR_IDS)
if monitor_id is None:
logger.debug('monitor_id is None, using default.')
monitor_id = 'default'
if monitor_id not in FILEMONITOR_IDS:
msg = 'No available monitor with id %r could be found.'
raise NoAvailableMonitorError(msg % monitor_id)
# retrieve the correct class and assert it can be used
cls = FILEMONITOR_IDS[monitor_id]
logger.debug('Checking availability of monitor class %s', cls)
is_available = yield cls.is_available_monitor()
if is_available:
logger.debug('Monitor is available, returning monitor with id "%s"',
monitor_id)
defer.returnValue(cls)
elif not is_available and monitor_id != DEFAULT_MONITOR:
logger.debug('Monitor is NOT available, returning default monitor.')
cls = yield get_filemonitor_class(DEFAULT_MONITOR)
defer.returnValue(cls)
else:
raise NoAvailableMonitorError('No available monitor could be found.')
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