diff options
Diffstat (limited to 'server/src/leap')
| -rw-r--r-- | server/src/leap/soledad/server/caching.py | 32 | ||||
| -rw-r--r-- | server/src/leap/soledad/server/state.py | 141 | ||||
| -rw-r--r-- | server/src/leap/soledad/server/sync.py | 179 |
3 files changed, 181 insertions, 171 deletions
diff --git a/server/src/leap/soledad/server/caching.py b/server/src/leap/soledad/server/caching.py new file mode 100644 index 00000000..9a049a39 --- /dev/null +++ b/server/src/leap/soledad/server/caching.py @@ -0,0 +1,32 @@ +# -*- coding: utf-8 -*- +# caching.py +# Copyright (C) 2015 LEAP +# +# 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/>. +""" +Server side caching. Using beaker for now. +""" +from beaker.cache import CacheManager + + +def setup_caching(): + _cache_manager = CacheManager(type='memory') + return _cache_manager + + +_cache_manager = setup_caching() + + +def get_cache_for(key, expire=3600): + return _cache_manager.get_cache(key, expire=expire) diff --git a/server/src/leap/soledad/server/state.py b/server/src/leap/soledad/server/state.py new file mode 100644 index 00000000..f269b77e --- /dev/null +++ b/server/src/leap/soledad/server/state.py @@ -0,0 +1,141 @@ +# -*- coding: utf-8 -*- +# state.py +# Copyright (C) 2015 LEAP +# +# 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/>. +""" +Server side synchronization infrastructure. +""" +from leap.soledad.server import caching + + +class ServerSyncState(object): + """ + The state of one sync session, as stored on backend server. + + On server side, the ongoing syncs metadata is maintained in + a caching layer. + """ + + def __init__(self, source_replica_uid, sync_id): + """ + Initialize the sync state object. + + :param sync_id: The id of current sync + :type sync_id: str + :param source_replica_uid: The source replica uid + :type source_replica_uid: str + """ + self._source_replica_uid = source_replica_uid + self._sync_id = sync_id + caching_key = source_replica_uid + sync_id + self._storage = caching.get_cache_for(caching_key) + + def _put_dict_info(self, key, value): + """ + Put some information about the sync state. + + :param key: The key for the info to be put. + :type key: str + :param value: The value for the info to be put. + :type value: str + """ + if key not in self._storage: + self._storage[key] = [] + info_list = self._storage.get(key) + info_list.append(value) + self._storage[key] = info_list + + def put_seen_id(self, seen_id, gen): + """ + Put one seen id on the sync state. + + :param seen_id: The doc_id of a document seen during sync. + :type seen_id: str + :param gen: The corresponding db generation. + :type gen: int + """ + self._put_dict_info( + 'seen_id', + (seen_id, gen)) + + def seen_ids(self): + """ + Return all document ids seen during the sync. + + :return: A dict with doc ids seen during the sync. + :rtype: dict + """ + if 'seen_id' in self._storage: + seen_ids = self._storage.get('seen_id') + else: + seen_ids = [] + return dict(seen_ids) + + def put_changes_to_return(self, gen, trans_id, changes_to_return): + """ + Put the calculated changes to return in the backend sync state. + + :param gen: The target database generation that will be synced. + :type gen: int + :param trans_id: The target database transaction id that will be + synced. + :type trans_id: str + :param changes_to_return: A list of tuples with the changes to be + returned during the sync process. + :type changes_to_return: list + """ + self._put_dict_info( + 'changes_to_return', + { + 'gen': gen, + 'trans_id': trans_id, + 'changes_to_return': changes_to_return, + } + ) + + def sync_info(self): + """ + Return information about the current sync state. + + :return: The generation and transaction id of the target database + which will be synced, and the number of documents to return, + or a tuple of Nones if those have not already been sent to + server. + :rtype: tuple + """ + gen = trans_id = number_of_changes = None + if 'changes_to_return' in self._storage: + info = self._storage.get('changes_to_return')[0] + gen = info['gen'] + trans_id = info['trans_id'] + number_of_changes = len(info['changes_to_return']) + return gen, trans_id, number_of_changes + + def next_change_to_return(self, received): + """ + Return the next change to be returned to the source syncing replica. + + :param received: How many documents the source replica has already + received during the current sync process. + :type received: int + """ + gen = trans_id = next_change_to_return = None + if 'changes_to_return' in self._storage: + info = self._storage.get('changes_to_return')[0] + gen = info['gen'] + trans_id = info['trans_id'] + if received < len(info['changes_to_return']): + next_change_to_return = (info['changes_to_return'][received]) + return gen, trans_id, next_change_to_return diff --git a/server/src/leap/soledad/server/sync.py b/server/src/leap/soledad/server/sync.py index 18c4ee40..619be565 100644 --- a/server/src/leap/soledad/server/sync.py +++ b/server/src/leap/soledad/server/sync.py @@ -17,183 +17,16 @@ """ Server side synchronization infrastructure. """ -import json - -from leap.soledad.common.couch import CouchDatabase from u1db import sync, Document from u1db.remote import http_app +from leap.soledad.server.state import ServerSyncState +from leap.soledad.server.caching import get_cache_for MAX_REQUEST_SIZE = 200 # in Mb MAX_ENTRY_SIZE = 200 # in Mb -class ServerSyncState(object): - """ - The state of one sync session, as stored on backend server. - - This object performes queries to distinct design documents: - - _design/syncs/_update/state - _design/syncs/_view/state - _design/syncs/_view/seen_ids - _design/syncs/_view/changes_to_return - - On server side, the ongoing syncs metadata is maintained in a document - called 'u1db_sync_state'. - """ - - def __init__(self, db, source_replica_uid, sync_id): - """ - Initialize the sync state object. - - :param db: The target syncing database. - :type db: CouchDatabase. - :param source_replica_uid: CouchDatabase - :type source_replica_uid: str - """ - self._db = db - self._source_replica_uid = source_replica_uid - self._sync_id = sync_id - - def _key(self, key): - """ - Format a key to be used on couch views. - - :param key: The lookup key. - :type key: json serializable object - - :return: The properly formatted key. - :rtype: str - """ - return json.dumps(key, separators=(',', ':')) - - def _put_info(self, key, value): - """ - Put some information on the sync state document. - - This method works in conjunction with the - _design/syncs/_update/state update handler couch backend. - - :param key: The key for the info to be put. - :type key: str - :param value: The value for the info to be put. - :type value: str - """ - ddoc_path = [ - '_design', 'syncs', '_update', 'state', - 'u1db_sync_state'] - res = self._db._database.resource(*ddoc_path) - with CouchDatabase.sync_info_lock[self._db.replica_uid]: - res.put_json( - body={ - 'sync_id': self._sync_id, - 'source_replica_uid': self._source_replica_uid, - key: value, - }, - headers={'content-type': 'application/json'}) - - def put_seen_id(self, seen_id, gen): - """ - Put one seen id on the sync state document. - - :param seen_id: The doc_id of a document seen during sync. - :type seen_id: str - :param gen: The corresponding db generation for that document. - :type gen: int - """ - self._put_info( - 'seen_id', - [seen_id, gen]) - - def seen_ids(self): - """ - Return all document ids seen during the sync. - - :return: A list with doc ids seen during the sync. - :rtype: list - """ - ddoc_path = ['_design', 'syncs', '_view', 'seen_ids'] - resource = self._db._database.resource(*ddoc_path) - response = resource.get_json( - key=self._key([self._source_replica_uid, self._sync_id])) - data = response[2] - if data['rows']: - entry = data['rows'].pop() - return entry['value']['seen_ids'] - return [] - - def put_changes_to_return(self, gen, trans_id, changes_to_return): - """ - Put the calculated changes to return in the backend sync state - document. - - :param gen: The target database generation that will be synced. - :type gen: int - :param trans_id: The target database transaction id that will be - synced. - :type trans_id: str - :param changes_to_return: A list of tuples with the changes to be - returned during the sync process. - :type changes_to_return: list - """ - self._put_info( - 'changes_to_return', - { - 'gen': gen, - 'trans_id': trans_id, - 'changes_to_return': changes_to_return, - } - ) - - def sync_info(self): - """ - Return information about the current sync state. - - :return: The generation and transaction id of the target database - which will be synced, and the number of documents to return, - or a tuple of Nones if those have not already been sent to - server. - :rtype: tuple - """ - ddoc_path = ['_design', 'syncs', '_view', 'state'] - resource = self._db._database.resource(*ddoc_path) - response = resource.get_json( - key=self._key([self._source_replica_uid, self._sync_id])) - data = response[2] - gen = None - trans_id = None - number_of_changes = None - if data['rows'] and data['rows'][0]['value'] is not None: - value = data['rows'][0]['value'] - gen = value['gen'] - trans_id = value['trans_id'] - number_of_changes = value['number_of_changes'] - return gen, trans_id, number_of_changes - - def next_change_to_return(self, received): - """ - Return the next change to be returned to the source syncing replica. - - :param received: How many documents the source replica has already - received during the current sync process. - :type received: int - """ - ddoc_path = ['_design', 'syncs', '_view', 'changes_to_return'] - resource = self._db._database.resource(*ddoc_path) - response = resource.get_json( - key=self._key( - [self._source_replica_uid, self._sync_id, received])) - data = response[2] - if not data['rows']: - return None, None, None - value = data['rows'][0]['value'] - gen = value['gen'] - trans_id = value['trans_id'] - next_change_to_return = value['next_change_to_return'] - return gen, trans_id, tuple(next_change_to_return) - - class SyncExchange(sync.SyncExchange): def __init__(self, db, source_replica_uid, last_known_generation, sync_id): @@ -216,8 +49,7 @@ class SyncExchange(sync.SyncExchange): self.new_trans_id = None self._trace_hook = None # recover sync state - self._sync_state = ServerSyncState( - self._db, self.source_replica_uid, sync_id) + self._sync_state = ServerSyncState(self.source_replica_uid, sync_id) def find_changes_to_return(self, received): """ @@ -353,10 +185,15 @@ class SyncResource(http_app.SyncResource): :type ensure: bool """ # create or open the database + cache = get_cache_for('db-' + sync_id + self.dbname) if ensure: db, self.replica_uid = self.state.ensure_database(self.dbname) + elif cache and 'instance' in cache: + db = cache['instance'] else: db = self.state.open_database(self.dbname) + db.init_caching(cache) + cache['instance'] = db # validate the information the client has about server replica db.validate_gen_and_trans_id( last_known_generation, last_known_trans_id) |