/usr/lib/python2.7/dist-packages/twext/who/aggregate.py is in python-twext 0.1.b2.dev15059-1.
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##
# Copyright (c) 2006-2015 Apple 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.
##
"""
Directory service which aggregates multiple directory services.
"""
__all__ = [
"DirectoryService",
]
import collections
from itertools import chain
from twisted.python.components import proxyForInterface
from twisted.internet.defer import (
gatherResults, FirstError, succeed, inlineCallbacks, returnValue
)
from .idirectory import DirectoryConfigurationError, IDirectoryService
from .directory import (
DirectoryService as BaseDirectoryService
)
from .util import ConstantsContainer
class DirectoryService(BaseDirectoryService):
"""
Aggregate directory service.
"""
def __init__(self, realmName, services):
recordTypes = set()
for service in services:
if not IDirectoryService.implementedBy(service.__class__):
raise ValueError(
"Not a directory service: {0}".format(service)
)
service = proxyForInterface(
IDirectoryService, originalAttribute="_service"
)(service)
for recordType in service.recordTypes():
if recordType in recordTypes:
raise DirectoryConfigurationError(
"Aggregated services may not vend "
"the same record type: {0}"
.format(recordType)
)
recordTypes.add(recordType)
BaseDirectoryService.__init__(self, realmName)
self._services = tuple(services)
@property
def services(self):
return self._services
@property
def recordType(self):
if not hasattr(self, "_recordType"):
self._recordType = ConstantsContainer(tuple(
s.recordTypes()
for s in self.services
))
return self._recordType
@inlineCallbacks
def _oneFromSubServices(self, methodName, *args, **kwargs):
for service in self.services:
m = getattr(service, methodName)
record = yield m(*args, **kwargs)
if record is not None:
returnValue(record)
returnValue(None)
def _gatherFromSubServices(self, methodName, *args, **kwargs):
ds = []
for service in self.services:
m = getattr(service, methodName)
d = m(*args, **kwargs)
ds.append(d)
def unwrapFirstError(f):
f.trap(FirstError)
return f.value.subFailure
d = gatherResults(ds, consumeErrors=True)
d.addCallback(lambda results: chain(*results))
d.addErrback(unwrapFirstError)
return d
def recordsFromExpression(
self, expression, recordTypes=None, records=None,
limitResults=None, timeoutSeconds=None
):
return self._gatherFromSubServices(
"recordsFromExpression", expression, recordTypes=recordTypes,
records=None,
limitResults=limitResults, timeoutSeconds=timeoutSeconds
)
# Implementation of recordWith*() methods may seem unnecessary here, since
# they eventually end up at recordsFromExpression() anyway (in our
# superclass).
# However, the wrapped services may have optimzed versions of these, so we
# want to call their implementations, not bypass them.
def recordsWithFieldValue(
self, fieldName, value, limitResults=None, timeoutSeconds=None
):
return self._gatherFromSubServices(
"recordsWithFieldValue", fieldName, value,
limitResults=limitResults, timeoutSeconds=timeoutSeconds
)
def recordWithUID(self, uid, timeoutSeconds=None):
return self._oneFromSubServices(
"recordWithUID", uid, timeoutSeconds=timeoutSeconds
)
def recordWithGUID(self, guid, timeoutSeconds=None):
return self._oneFromSubServices(
"recordWithGUID", guid, timeoutSeconds=timeoutSeconds
)
def recordsWithRecordType(
self, recordType, limitResults=None, timeoutSeconds=None
):
# Since we know the recordType, we can go directly to the appropriate
# service.
for service in self.services:
if recordType in service.recordTypes():
return service.recordsWithRecordType(
recordType,
limitResults=limitResults, timeoutSeconds=timeoutSeconds
)
return succeed(())
def recordWithShortName(self, recordType, shortName, timeoutSeconds=None):
# Since we know the recordType, we can go directly to the appropriate
# service.
for service in self.services:
if recordType in service.recordTypes():
return service.recordWithShortName(
recordType, shortName, timeoutSeconds=timeoutSeconds
)
return succeed(None)
def recordsWithEmailAddress(
self, emailAddress, limitResults=None, timeoutSeconds=None
):
return self._gatherFromSubServices(
"recordsWithEmailAddress", emailAddress,
limitResults=limitResults, timeoutSeconds=timeoutSeconds
)
@inlineCallbacks
def updateRecords(self, records, create=False):
# When migrating there may be lots of new records so batch this by each
# service record type.
recordsByType = collections.defaultdict(list)
for record in records:
recordsByType[record.recordType].append(record)
for recordType, recordList in recordsByType.items():
for service in self.services:
if recordType in service.recordTypes():
yield service.updateRecords(recordList, create=create)
@inlineCallbacks
def removeRecords(self, uids):
# FIXME: since we don't know which sub-service owns each uid, we
# currently try removing the uids in each sub-service, ignoring
# errors.
for service in self.services:
try:
yield service.removeRecords(uids)
except:
pass
@inlineCallbacks
def flush(self):
for service in self.services:
try:
yield service.flush()
except:
pass
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