/usr/lib/python2.7/dist-packages/zake/fake_storage.py is in python-zake 0.1.6-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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# vim: tabstop=4 shiftwidth=4 softtabstop=4
# Copyright (C) 2013 Yahoo! Inc. All Rights Reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License"); you may
# not use this file except in compliance with the License. You may obtain
# a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
# License for the specific language governing permissions and limitations
# under the License.
import contextlib
import itertools
import os
import sys
import six
from zake import utils
from kazoo import exceptions as k_exceptions
from kazoo.protocol import states as k_states
# See: https://issues.apache.org/jira/browse/ZOOKEEPER-243
SEQ_ROLLOVER = 2147483647
SEQ_ROLLOVER_TO = -2147483647
ROOT_PATH = '/'
class FakeStorage(object):
"""A place too place fake zookeeper paths + data + connected clients."""
def __init__(self, handler, paths=None, sequences=None):
if paths:
self._paths = dict(paths)
else:
self._paths = {}
if sequences:
self._sequences = dict(sequences)
else:
self._sequences = {}
self._lock = handler.rlock_object()
# Ensure the root path *always* exists.
if ROOT_PATH not in self._paths:
self._paths[ROOT_PATH] = {
'created_on': 0,
'updated_on': 0,
'version': 0,
# Not supported for now...
'aversion': -1,
'cversion': -1,
'data': b"",
'ephemeral': False,
}
self._clients = set()
self._client_lock = handler.rlock_object()
@property
def lock(self):
return self._lock
def attach(self, client):
with self._client_lock:
if client not in self._clients:
self._clients.add(client)
def _make_znode(self, node, child_count):
# Not exactly right, but good enough...
translated = {
'czxid': node['version'],
'mzxid': node['version'],
'pzxid': node['version'],
'ctime': node['created_on'],
'mtime': node['updated_on'],
'version': node['version'],
'aversion': node['aversion'],
'cversion': node['cversion'],
'dataLength': len(node['data']),
'numChildren': int(child_count),
}
if node['ephemeral']:
translated['ephemeralOwner'] = node['ephemeral_owner']
else:
translated['ephemeralOwner'] = 0
return k_states.ZnodeStat(**translated)
@property
def paths(self):
return self._paths
@property
def sequences(self):
return self._sequences
@property
def clients(self):
return self._clients
def __getitem__(self, path):
return self._paths[path]
def __setitem__(self, path, value):
with self.lock:
self._paths[path] = value
def set(self, path, value, version=-1):
with self.lock:
if version != -1:
stat = self.get(path)[1]
if stat.version != version:
raise k_exceptions.BadVersionError("Version mismatch %s "
"!= %s" % (stat.version,
version))
self._paths[path]['data'] = value
self._paths[path]['updated_on'] = utils.millitime()
self._paths[path]['version'] += 1
else:
self._paths[path]['data'] = value
self._paths[path]['updated_on'] = utils.millitime()
self._paths[path]['version'] += 1
return self.get(path)[1]
def purge(self, client):
if not client.session_id:
return 0
with self._client_lock:
if client in self._clients:
self._clients.discard(client)
else:
return 0
removals = []
with self.lock:
for path, data in six.iteritems(self._paths):
if data['ephemeral'] \
and data['ephemeral_owner'] == client.session_id:
removals.append(path)
data_watches = []
for path in removals:
event = k_states.WatchedEvent(
type=k_states.EventType.DELETED,
state=k_states.KeeperState.CONNECTED,
path=path)
data_watches.append(([path], event))
fire_paths = []
for path in removals:
parents = sorted(six.iterkeys(self.get_parents(path)))
for parent_path in parents:
if parent_path in fire_paths:
continue
fire_paths.append(parent_path)
child_watches = []
for path in fire_paths:
event = k_states.WatchedEvent(
type=k_states.EventType.DELETED,
state=k_states.KeeperState.CONNECTED,
path=path)
child_watches.append(([path], event))
for path in removals:
del self._paths[path]
self.inform(client, child_watches, data_watches, inform_self=False)
return len(removals)
def inform(self, client, child_watches, data_watches, inform_self=True):
with self._client_lock:
clients = self._clients.copy()
for other_client in clients:
if not inform_self and other_client is client:
continue
other_client.fire_child_watches(child_watches)
other_client.fire_data_watches(data_watches)
def create(self, path, value=b"", sequence=False,
ephemeral=False, session_id=None):
def sequence_iter(path, parent_path):
for i in itertools.count(0):
sequence_id = self._sequences.get(parent_path, 0)
if sequence_id == SEQ_ROLLOVER:
self._sequences[parent_path] = SEQ_ROLLOVER_TO
else:
self._sequences[parent_path] = sequence_id + 1
yield path + '%010d' % (sequence_id)
parent_path, _node_name = os.path.split(path)
with self.lock:
if sequence:
for possible_path in sequence_iter(path, parent_path):
if possible_path not in self:
path = possible_path
break
parents = sorted(six.iterkeys(self.get_parents(path)))
if parent_path not in self:
if sequence:
self._sequences.pop(parent_path, None)
raise k_exceptions.NoNodeError("Parent node %s does not exist"
% (parent_path))
if ephemeral and not session_id:
raise k_exceptions.SystemZookeeperError("Ephemeral node %s can"
" not be created"
" without a session"
" id" % path)
if path in self:
raise k_exceptions.NodeExistsError("Node %s already"
" exists" % (path))
for parent_path in reversed(parents):
if self._paths[parent_path]['ephemeral']:
raise k_exceptions.NoChildrenForEphemeralsError(
"Parent %s is ephemeral" % parent_path)
path_data = {
# Kazoo clients expect in milliseconds
'created_on': utils.millitime(),
'updated_on': utils.millitime(),
'version': 0,
# Not supported for now...
'aversion': -1,
'cversion': -1,
'data': value,
}
if ephemeral:
path_data['ephemeral_owner'] = session_id
path_data['ephemeral'] = True
else:
path_data['ephemeral'] = False
self._paths[path] = path_data
return (True, parents, path)
def pop(self, path):
if path == ROOT_PATH:
raise k_exceptions.BadArgumentsError("Can not delete %s"
% ROOT_PATH)
with self.lock:
self._paths.pop(path)
def get(self, path):
with self.lock:
node = self._paths[path]
children_count = len(self.get_children(path))
return (node['data'], self._make_znode(node, children_count))
def __contains__(self, path):
return path in self._paths
@contextlib.contextmanager
def transaction(self):
with self.lock:
# Keep the before the transaction information and reset to that
# data if the context manager fails (this makes it appear that the
# operations done during the transaction either complete as a
# group or do not complete).
paths = self._paths.copy()
sequences = self._sequences.copy()
try:
yield
except Exception:
cause = sys.exc_info()
try:
self._paths = paths
self._sequences = sequences
finally:
six.reraise(*cause)
def get_children(self, path, only_direct=True):
paths = {}
with self.lock:
for (other_path, data) in list(six.iteritems(self._paths)):
if utils.is_child_path(path, other_path,
only_direct=only_direct):
paths[other_path] = data
return paths
def get_parents(self, path):
paths = {}
with self.lock:
for (other_path, data) in list(six.iteritems(self._paths)):
if utils.is_child_path(other_path, path, only_direct=False):
paths[other_path] = data
return paths
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