276 lines
9.5 KiB
Python
276 lines
9.5 KiB
Python
# -*- coding: utf-8 -*-
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# Copyright 2015, 2016 OpenMarket Ltd
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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from twisted.internet import defer
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from synapse.api.constants import EventTypes
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from synapse.util.metrics import Measure
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from synapse.util.logcontext import preserve_fn, preserve_context_over_deferred
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import logging
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logger = logging.getLogger(__name__)
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def log_failure(failure):
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logger.error(
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"Application Services Failure",
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exc_info=(
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failure.type,
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failure.value,
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failure.getTracebackObject()
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)
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)
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class ApplicationServicesHandler(object):
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def __init__(self, hs):
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self.store = hs.get_datastore()
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self.is_mine_id = hs.is_mine_id
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self.appservice_api = hs.get_application_service_api()
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self.scheduler = hs.get_application_service_scheduler()
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self.started_scheduler = False
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self.clock = hs.get_clock()
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self.notify_appservices = hs.config.notify_appservices
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self.current_max = 0
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self.is_processing = False
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@defer.inlineCallbacks
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def notify_interested_services(self, current_id):
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"""Notifies (pushes) all application services interested in this event.
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Pushing is done asynchronously, so this method won't block for any
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prolonged length of time.
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Args:
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current_id(int): The current maximum ID.
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"""
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services = self.store.get_app_services()
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if not services or not self.notify_appservices:
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return
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self.current_max = max(self.current_max, current_id)
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if self.is_processing:
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return
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with Measure(self.clock, "notify_interested_services"):
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self.is_processing = True
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try:
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upper_bound = self.current_max
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limit = 100
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while True:
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upper_bound, events = yield self.store.get_new_events_for_appservice(
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upper_bound, limit
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)
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if not events:
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break
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for event in events:
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# Gather interested services
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services = yield self._get_services_for_event(event)
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if len(services) == 0:
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continue # no services need notifying
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# Do we know this user exists? If not, poke the user
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# query API for all services which match that user regex.
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# This needs to block as these user queries need to be
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# made BEFORE pushing the event.
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yield self._check_user_exists(event.sender)
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if event.type == EventTypes.Member:
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yield self._check_user_exists(event.state_key)
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if not self.started_scheduler:
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self.scheduler.start().addErrback(log_failure)
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self.started_scheduler = True
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# Fork off pushes to these services
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for service in services:
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preserve_fn(self.scheduler.submit_event_for_as)(
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service, event
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)
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yield self.store.set_appservice_last_pos(upper_bound)
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if len(events) < limit:
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break
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finally:
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self.is_processing = False
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@defer.inlineCallbacks
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def query_user_exists(self, user_id):
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"""Check if any application service knows this user_id exists.
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Args:
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user_id(str): The user to query if they exist on any AS.
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Returns:
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True if this user exists on at least one application service.
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"""
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user_query_services = yield self._get_services_for_user(
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user_id=user_id
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)
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for user_service in user_query_services:
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is_known_user = yield self.appservice_api.query_user(
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user_service, user_id
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)
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if is_known_user:
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defer.returnValue(True)
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defer.returnValue(False)
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@defer.inlineCallbacks
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def query_room_alias_exists(self, room_alias):
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"""Check if an application service knows this room alias exists.
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Args:
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room_alias(RoomAlias): The room alias to query.
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Returns:
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namedtuple: with keys "room_id" and "servers" or None if no
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association can be found.
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"""
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room_alias_str = room_alias.to_string()
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services = self.store.get_app_services()
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alias_query_services = [
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s for s in services if (
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s.is_interested_in_alias(room_alias_str)
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)
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]
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for alias_service in alias_query_services:
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is_known_alias = yield self.appservice_api.query_alias(
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alias_service, room_alias_str
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)
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if is_known_alias:
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# the alias exists now so don't query more ASes.
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result = yield self.store.get_association_from_room_alias(
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room_alias
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)
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defer.returnValue(result)
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@defer.inlineCallbacks
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def query_3pe(self, kind, protocol, fields):
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services = yield self._get_services_for_3pn(protocol)
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results = yield preserve_context_over_deferred(defer.DeferredList([
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preserve_fn(self.appservice_api.query_3pe)(service, kind, protocol, fields)
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for service in services
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], consumeErrors=True))
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ret = []
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for (success, result) in results:
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if success:
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ret.extend(result)
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defer.returnValue(ret)
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@defer.inlineCallbacks
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def get_3pe_protocols(self, only_protocol=None):
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services = self.store.get_app_services()
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protocols = {}
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# Collect up all the individual protocol responses out of the ASes
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for s in services:
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for p in s.protocols:
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if only_protocol is not None and p != only_protocol:
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continue
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if p not in protocols:
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protocols[p] = []
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info = yield self.appservice_api.get_3pe_protocol(s, p)
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if info is not None:
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protocols[p].append(info)
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def _merge_instances(infos):
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if not infos:
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return {}
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# Merge the 'instances' lists of multiple results, but just take
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# the other fields from the first as they ought to be identical
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# copy the result so as not to corrupt the cached one
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combined = dict(infos[0])
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combined["instances"] = list(combined["instances"])
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for info in infos[1:]:
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combined["instances"].extend(info["instances"])
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return combined
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for p in protocols.keys():
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protocols[p] = _merge_instances(protocols[p])
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defer.returnValue(protocols)
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@defer.inlineCallbacks
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def _get_services_for_event(self, event):
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"""Retrieve a list of application services interested in this event.
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Args:
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event(Event): The event to check. Can be None if alias_list is not.
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Returns:
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list<ApplicationService>: A list of services interested in this
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event based on the service regex.
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"""
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services = self.store.get_app_services()
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interested_list = [
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s for s in services if (
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yield s.is_interested(event, self.store)
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)
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]
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defer.returnValue(interested_list)
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def _get_services_for_user(self, user_id):
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services = self.store.get_app_services()
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interested_list = [
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s for s in services if (
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s.is_interested_in_user(user_id)
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)
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]
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return defer.succeed(interested_list)
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def _get_services_for_3pn(self, protocol):
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services = self.store.get_app_services()
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interested_list = [
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s for s in services if s.is_interested_in_protocol(protocol)
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]
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return defer.succeed(interested_list)
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@defer.inlineCallbacks
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def _is_unknown_user(self, user_id):
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if not self.is_mine_id(user_id):
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# we don't know if they are unknown or not since it isn't one of our
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# users. We can't poke ASes.
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defer.returnValue(False)
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return
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user_info = yield self.store.get_user_by_id(user_id)
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if user_info:
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defer.returnValue(False)
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return
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# user not found; could be the AS though, so check.
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services = self.store.get_app_services()
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service_list = [s for s in services if s.sender == user_id]
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defer.returnValue(len(service_list) == 0)
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@defer.inlineCallbacks
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def _check_user_exists(self, user_id):
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unknown_user = yield self._is_unknown_user(user_id)
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if unknown_user:
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exists = yield self.query_user_exists(user_id)
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defer.returnValue(exists)
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defer.returnValue(True)
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