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# Copyright (C) 2012-2014 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 sys
import shutil
import logging
from urlparse import urlsplit
from os.path import join, dirname, exists, isabs
from gettext import gettext as _
from sugar_network import toolkit
from sugar_network.model.context import Context
from sugar_network.model.post import Post
from sugar_network.model.report import Report
from sugar_network.node.model import User
from sugar_network.node import master_api
from sugar_network.node.routes import NodeRoutes
from sugar_network.toolkit.router import route, ACL
from sugar_network.toolkit.coroutine import this
from sugar_network.toolkit import http, parcel, ranges, enforce
RESOURCES = (User, Context, Post, Report)
_logger = logging.getLogger('node.slave')
class SlaveRoutes(NodeRoutes):
def __init__(self, volume, **kwargs):
guid_path = join(volume.root, 'etc', 'node')
if exists(guid_path):
with file(guid_path) as f:
guid = f.read().strip()
else:
guid = toolkit.uuid()
if not exists(dirname(guid_path)):
os.makedirs(dirname(guid_path))
with file(guid_path, 'w') as f:
f.write(guid)
NodeRoutes.__init__(self, guid, volume=volume, **kwargs)
vardir = join(volume.root, 'var')
self._push_r = toolkit.Bin(join(vardir, 'push.ranges'), [[1, None]])
self._pull_r = toolkit.Bin(join(vardir, 'pull.ranges'), [[1, None]])
self._master_guid = urlsplit(master_api.value).netloc
@route('POST', cmd='online_sync', acl=ACL.LOCAL,
arguments={'no_pull': bool})
def online_sync(self, no_pull=False):
conn = http.Connection(master_api.value)
response = conn.request('POST',
data=parcel.encode(self._export(not no_pull), header={
'from': self.guid,
'to': self._master_guid,
}),
params={'cmd': 'sync'},
headers={'Transfer-Encoding': 'chunked'})
self._import(parcel.decode(response.raw))
@route('POST', cmd='offline_sync', acl=ACL.LOCAL)
def offline_sync(self, path):
enforce(isabs(path), "Argument 'path' is not an absolute path")
_logger.debug('Start offline synchronization in %r', path)
if not exists(path):
os.makedirs(path)
this.broadcast({
'event': 'sync_progress',
'progress': _('Reading sneakernet packages'),
})
requests = self._import(parcel.decode_dir(path))
this.broadcast({
'event': 'sync_progress',
'progress': _('Generating new sneakernet package'),
})
offline_script = join(dirname(sys.argv[0]), 'sugar-network-sync')
if exists(offline_script):
shutil.copy(offline_script, path)
parcel.encode_dir(requests + self._export(True), root=path, header={
'from': self.guid,
'to': self._master_guid,
})
_logger.debug('Synchronization completed')
def status(self):
result = NodeRoutes.status(self)
result['mode'] = 'slave'
return result
def _import(self, package):
requests = []
for packet in package:
sender = packet['from']
from_master = (sender == self._master_guid)
if packet.name == 'push':
seqno, committed = this.volume.patch(packet)
if seqno is not None:
if from_master:
with self._pull_r as r:
ranges.exclude(r, committed)
else:
requests.append(('request', {
'origin': sender,
'ranges': committed,
}, []))
with self._push_r as r:
ranges.exclude(r, seqno, seqno)
elif packet.name == 'ack' and from_master and \
packet['to'] == self.guid:
with self._pull_r as r:
ranges.exclude(r, packet['ack'])
if packet['ranges']:
with self._push_r as r:
ranges.exclude(r, packet['ranges'])
return requests
def _export(self, pull):
export = []
if pull:
export.append(('pull', {'ranges': self._pull_r.value}, None))
export.append(('push', None, self.volume.diff(self._push_r.value)))
return export
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