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# Copyright (C) 2012-2013 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 node, toolkit
from sugar_network.client import api_url
from sugar_network.node import sync, stats_user, files, model
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, enforce
_logger = logging.getLogger('node.slave')
class SlaveRoutes(NodeRoutes):
def __init__(self, key_path, volume_):
self._auth = http.SugarAuth(key_path)
NodeRoutes.__init__(self, self._auth.login, volume_)
self._push_seq = toolkit.PersistentSequence(
join(volume_.root, 'push.sequence'), [1, None])
self._pull_seq = toolkit.PersistentSequence(
join(volume_.root, 'pull.sequence'), [1, None])
self._files_seq = toolkit.PersistentSequence(
join(volume_.root, 'files.sequence'), [1, None])
self._master_guid = urlsplit(api_url.value).netloc
self._offline_session = None
@route('POST', cmd='online-sync', acl=ACL.LOCAL)
def online_sync(self, no_pull=False):
conn = http.Connection(api_url.value, auth=self._auth)
# TODO `http.Connection` should handle re-POSTing without
# loosing payload after authentication
conn.get(cmd='logon')
push = [('diff', None, model.diff(self.volume, self._push_seq))]
if not no_pull:
push.extend([
('pull', {
'sequence': self._pull_seq,
'layer': node.sync_layers.value,
}, None),
('files_pull', {'sequence': self._files_seq}, None),
])
if stats_user.stats_user.value:
push.append(('stats_diff', None, stats_user.diff()))
response = conn.request('POST',
data=sync.encode(push, src=self.guid, dst=self._master_guid),
params={'cmd': 'sync'},
headers={'Transfer-Encoding': 'chunked'})
self._import(sync.decode(response.raw), None)
@route('POST', cmd='offline-sync', acl=ACL.LOCAL)
def offline_sync(self, path):
enforce(node.sync_layers.value,
'--sync-layers is not specified, the full master dump '
'might be too big and should be limited')
enforce(isabs(path), 'Argument \'path\' should be an absolute path')
_logger.debug('Start %r synchronization session in %r',
self._offline_session, path)
if not exists(path):
os.makedirs(path)
try:
self._offline_session = self._offline_sync(path,
**(self._offline_session or {}))
except Exception:
toolkit.exception(_logger, 'Failed to complete synchronization')
self._offline_session = None
raise
if self._offline_session is None:
_logger.debug('Synchronization completed')
else:
_logger.debug('Postpone synchronization with %r session',
self._offline_session)
def status(self):
result = NodeRoutes.status(self)
result['level'] = 'slave'
return result
def _offline_sync(self, path, push_seq=None, stats_seq=None, session=None):
push = []
if push_seq is None:
push_seq = toolkit.Sequence(self._push_seq)
if stats_seq is None:
stats_seq = {}
if session is None:
session = toolkit.uuid()
push.append(('pull', {
'sequence': self._pull_seq,
'layer': node.sync_layers.value,
}, None))
push.append(('files_pull', {'sequence': self._files_seq}, None))
this.broadcast({
'event': 'sync_progress',
'progress': _('Reading sneakernet packages'),
})
self._import(sync.sneakernet_decode(path), push_seq)
offline_script = join(dirname(sys.argv[0]), 'sugar-network-sync')
if exists(offline_script):
shutil.copy(offline_script, path)
this.broadcast({
'event': 'sync_progress',
'progress': _('Generating new sneakernet package'),
})
diff_seq = toolkit.Sequence([])
push.append(('diff', None,
model.diff(self.volume, push_seq, diff_seq)))
if stats_user.stats_user.value:
push.append(('stats_diff', None, stats_user.diff(stats_seq)))
complete = sync.sneakernet_encode(push, root=path,
src=self.guid, dst=self._master_guid, api_url=api_url.value,
session=session)
if not complete:
push_seq.exclude(diff_seq)
return {'push_seq': push_seq,
'stats_seq': stats_seq,
'session': session,
}
def _import(self, package, push_seq):
for packet in package:
from_master = (packet['src'] == self._master_guid)
addressed = (packet['dst'] == self.guid)
if packet.name == 'diff':
_logger.debug('Processing %r', packet)
seq, __ = model.merge(self.volume, packet, shift_seqno=False)
if from_master and seq:
self._pull_seq.exclude(seq)
self._pull_seq.commit()
elif from_master:
if packet.name == 'ack' and addressed:
_logger.debug('Processing %r', packet)
if push_seq:
push_seq.exclude(packet['sequence'])
self._pull_seq.exclude(packet['ack'])
self._pull_seq.commit()
self._push_seq.exclude(packet['sequence'])
self._push_seq.commit()
elif packet.name == 'stats_ack' and addressed:
_logger.debug('Processing %r', packet)
stats_user.commit(packet['sequence'])
elif packet.name == 'files_diff':
_logger.debug('Processing %r', packet)
seq = files.merge(node.files_root.value, packet)
if seq:
self._files_seq.exclude(seq)
self._files_seq.commit()
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