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# -*- coding: utf-8 -*-
# Copyright 2014 matrix.org
#
# 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
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_token, limit):
return defer.succeed(([], from_token))
def get_current_token_part(self):
return defer.succeed(0)
def get_pagination_rows(self, user, pagination_config, key):
return defer.succeed(([], pagination_config.from_token))
class RoomEventSource(object):
def __init__(self, hs):
self.store = hs.get_datastore()
@defer.inlineCallbacks
def get_new_events_for_user(self, user, from_token, limit):
# We just ignore the key for now.
to_key = yield self.get_current_token_part()
events, end_key = yield self.store.get_room_events_stream(
user_id=user.to_string(),
from_key=from_token.events_key,
to_key=to_key,
room_id=None,
limit=limit,
)
end_token = from_token.copy_and_replace("events_key", end_key)
defer.returnValue((events, end_token))
def get_current_token_part(self):
return self.store.get_room_events_max_id()
@defer.inlineCallbacks
def get_pagination_rows(self, user, pagination_config, key):
from_token = pagination_config.from_token
to_token = pagination_config.to_token
limit = pagination_config.limit
direction = pagination_config.direction
to_key = to_token.events_key if to_token else None
events, next_key = yield self.store.paginate_room_events(
room_id=key,
from_key=from_token.events_key,
to_key=to_key,
direction=direction,
limit=limit,
with_feedback=True
)
next_token = from_token.copy_and_replace("events_key", next_key)
defer.returnValue((events, next_token))
class PresenceSource(object):
def __init__(self, hs):
self.hs = hs
self.clock = hs.get_clock()
def get_new_events_for_user(self, user, from_token, limit):
from_key = int(from_token.presence_key)
presence = self.hs.get_handlers().presence_handler
cachemap = presence._user_cachemap
# TODO(paul): limit, and filter by visibility
updates = [(k, cachemap[k]) for k in cachemap
if from_key < cachemap[k].serial]
if updates:
clock = self.clock
latest_serial = max([x[1].serial for x in updates])
data = [x[1].make_event(user=x[0], clock=clock) for x in updates]
end_token = from_token.copy_and_replace(
"presence_key", latest_serial
)
return ((data, end_token))
else:
end_token = from_token.copy_and_replace(
"presence_key", presence._user_cachemap_latest_serial
)
return (([], end_token))
def get_current_token_part(self):
presence = self.hs.get_handlers().presence_handler
return presence._user_cachemap_latest_serial
def get_pagination_rows(self, user, pagination_config, key):
# TODO (erikj): Does this make sense? Ordering?
from_token = pagination_config.from_token
to_token = pagination_config.to_token
from_key = int(from_token.presence_key)
if to_token:
to_key = int(to_token.presence_key)
else:
to_key = -1
presence = self.hs.get_handlers().presence_handler
cachemap = presence._user_cachemap
# TODO(paul): limit, and filter by visibility
updates = [(k, cachemap[k]) for k in cachemap
if to_key < cachemap[k].serial < from_key]
if updates:
clock = self.clock
earliest_serial = max([x[1].serial for x in updates])
data = [x[1].make_event(user=x[0], clock=clock) for x in updates]
if to_token:
next_token = to_token
else:
next_token = from_token
next_token = next_token.copy_and_replace(
"presence_key", earliest_serial
)
return ((data, next_token))
else:
if not to_token:
to_token = from_token.copy_and_replace(
"presence_key", 0
)
return (([], to_token))
class EventSources(object):
SOURCE_TYPES = {
"room": RoomEventSource,
"presence": PresenceSource,
}
def __init__(self, hs):
self.sources = {
name: cls(hs)
for name, cls in EventSources.SOURCE_TYPES.items()
}
@staticmethod
def create_token(events_key, presence_key):
return StreamToken(events_key=events_key, presence_key=presence_key)
@defer.inlineCallbacks
def get_current_token(self):
events_key = yield self.sources["room"].get_current_token_part()
presence_key = yield self.sources["presence"].get_current_token_part()
token = EventSources.create_token(events_key, presence_key)
defer.returnValue(token)
class StreamSource(object):
def get_new_events_for_user(self, user, from_token, limit):
raise NotImplementedError("get_new_events_for_user")
def get_current_token_part(self):
raise NotImplementedError("get_current_token_part")
def get_pagination_rows(self, user, pagination_config, key):
raise NotImplementedError("get_rows")
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