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# -*- coding: utf-8 -*-
# Copyright 2014 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.types import StreamToken
from synapse.handlers.presence import PresenceEventSource
from synapse.handlers.room import RoomEventSource
from synapse.handlers.typing import TypingNotificationEventSource
class NullSource(object):
"""This event source never yields any events and its token remains at
zero. It may be useful for unit-testing."""
def __init__(self, hs):
pass
def get_new_events_for_user(self, user, from_key, limit):
return defer.succeed(([], from_key))
def get_current_key(self):
return defer.succeed(0)
def get_pagination_rows(self, user, pagination_config, key):
return defer.succeed(([], pagination_config.from_token))
class EventSources(object):
SOURCE_TYPES = {
"room": RoomEventSource,
"presence": PresenceEventSource,
"typing": TypingNotificationEventSource,
}
def __init__(self, hs):
self.sources = {
name: cls(hs)
for name, cls in EventSources.SOURCE_TYPES.items()
}
@defer.inlineCallbacks
def get_current_token(self):
token = StreamToken(
room_key=(
yield self.sources["room"].get_current_key()
),
presence_key=(
yield self.sources["presence"].get_current_key()
),
typing_key=(
yield self.sources["typing"].get_current_key()
)
)
defer.returnValue(token)
class StreamSource(object):
def get_new_events_for_user(self, user, from_key, limit):
"""from_key is the key within this event source."""
raise NotImplementedError("get_new_events_for_user")
def get_current_key(self):
raise NotImplementedError("get_current_key")
def get_pagination_rows(self, user, pagination_config, key):
raise NotImplementedError("get_rows")
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