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# -*- coding: utf-8 -*-
# Copyright 2015 OpenMarket Ltd
#
# 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.
from twisted.internet import defer
from synapse.api.constants import EventTypes, Membership
from synapse.appservice import ApplicationService
from synapse.types import UserID
import logging
logger = logging.getLogger(__name__)
def log_failure(failure):
logger.error(
"Application Services Failure",
exc_info=(
failure.type,
failure.value,
failure.getTracebackObject()
)
)
# NB: Purposefully not inheriting BaseHandler since that contains way too much
# setup code which this handler does not need or use. This makes testing a lot
# easier.
class ApplicationServicesHandler(object):
def __init__(self, hs, appservice_api, appservice_scheduler):
self.store = hs.get_datastore()
self.hs = hs
self.appservice_api = appservice_api
self.scheduler = appservice_scheduler
self.started_scheduler = False
@defer.inlineCallbacks
def notify_interested_services(self, event):
"""Notifies (pushes) all application services interested in this event.
Pushing is done asynchronously, so this method won't block for any
prolonged length of time.
Args:
event(Event): The event to push out to interested services.
"""
# Gather interested services
services = yield self._get_services_for_event(event)
if len(services) == 0:
return # no services need notifying
# Do we know this user exists? If not, poke the user query API for
# all services which match that user regex. This needs to block as these
# user queries need to be made BEFORE pushing the event.
yield self._check_user_exists(event.sender)
if event.type == EventTypes.Member:
yield self._check_user_exists(event.state_key)
if not self.started_scheduler:
self.scheduler.start().addErrback(log_failure)
self.started_scheduler = True
# Fork off pushes to these services
for service in services:
self.scheduler.submit_event_for_as(service, event)
@defer.inlineCallbacks
def query_user_exists(self, user_id):
"""Check if any application service knows this user_id exists.
Args:
user_id(str): The user to query if they exist on any AS.
Returns:
True if this user exists on at least one application service.
"""
user_query_services = yield self._get_services_for_user(
user_id=user_id
)
for user_service in user_query_services:
is_known_user = yield self.appservice_api.query_user(
user_service, user_id
)
if is_known_user:
defer.returnValue(True)
defer.returnValue(False)
@defer.inlineCallbacks
def query_room_alias_exists(self, room_alias):
"""Check if an application service knows this room alias exists.
Args:
room_alias(RoomAlias): The room alias to query.
Returns:
namedtuple: with keys "room_id" and "servers" or None if no
association can be found.
"""
room_alias_str = room_alias.to_string()
alias_query_services = yield self._get_services_for_event(
event=None,
restrict_to=ApplicationService.NS_ALIASES,
alias_list=[room_alias_str]
)
for alias_service in alias_query_services:
is_known_alias = yield self.appservice_api.query_alias(
alias_service, room_alias_str
)
if is_known_alias:
# the alias exists now so don't query more ASes.
result = yield self.store.get_association_from_room_alias(
room_alias
)
defer.returnValue(result)
@defer.inlineCallbacks
def _get_services_for_event(self, event, restrict_to="", alias_list=None):
"""Retrieve a list of application services interested in this event.
Args:
event(Event): The event to check. Can be None if alias_list is not.
restrict_to(str): The namespace to restrict regex tests to.
alias_list: A list of aliases to get services for. If None, this
list is obtained from the database.
Returns:
list<ApplicationService>: A list of services interested in this
event based on the service regex.
"""
member_list = None
if hasattr(event, "room_id"):
# We need to know the aliases associated with this event.room_id,
# if any.
if not alias_list:
alias_list = yield self.store.get_aliases_for_room(
event.room_id
)
# We need to know the members associated with this event.room_id,
# if any.
member_list = yield self.store.get_room_members(
room_id=event.room_id,
membership=Membership.JOIN
)
services = yield self.store.get_app_services()
interested_list = [
s for s in services if (
s.is_interested(event, restrict_to, alias_list, member_list)
)
]
defer.returnValue(interested_list)
@defer.inlineCallbacks
def _get_services_for_user(self, user_id):
services = yield self.store.get_app_services()
interested_list = [
s for s in services if (
s.is_interested_in_user(user_id)
)
]
defer.returnValue(interested_list)
@defer.inlineCallbacks
def _is_unknown_user(self, user_id):
user = UserID.from_string(user_id)
if not self.hs.is_mine(user):
# we don't know if they are unknown or not since it isn't one of our
# users. We can't poke ASes.
defer.returnValue(False)
return
user_info = yield self.store.get_user_by_id(user_id)
if not user_info:
defer.returnValue(False)
return
# user not found; could be the AS though, so check.
services = yield self.store.get_app_services()
service_list = [s for s in services if s.sender == user_id]
defer.returnValue(len(service_list) == 0)
@defer.inlineCallbacks
def _check_user_exists(self, user_id):
unknown_user = yield self._is_unknown_user(user_id)
if unknown_user:
exists = yield self.query_user_exists(user_id)
defer.returnValue(exists)
defer.returnValue(True)
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