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511 lines
15 KiB
Python
511 lines
15 KiB
Python
# -*- coding: utf-8 -*-
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# Copyright 2017 Vector Creations 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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"""Defines all the valid streams that clients can subscribe to, and the format
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of the rows returned by each stream.
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Each stream is defined by the following information:
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stream name: The name of the stream
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row type: The type that is used to serialise/deserialse the row
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current_token: The function that returns the current token for the stream
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update_function: The function that returns a list of updates between two tokens
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"""
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import itertools
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import logging
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from collections import namedtuple
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from twisted.internet import defer
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logger = logging.getLogger(__name__)
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MAX_EVENTS_BEHIND = 10000
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EventStreamRow = namedtuple("EventStreamRow", (
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"event_id", # str
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"room_id", # str
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"type", # str
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"state_key", # str, optional
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"redacts", # str, optional
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))
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BackfillStreamRow = namedtuple("BackfillStreamRow", (
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"event_id", # str
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"room_id", # str
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"type", # str
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"state_key", # str, optional
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"redacts", # str, optional
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))
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PresenceStreamRow = namedtuple("PresenceStreamRow", (
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"user_id", # str
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"state", # str
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"last_active_ts", # int
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"last_federation_update_ts", # int
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"last_user_sync_ts", # int
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"status_msg", # str
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"currently_active", # bool
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))
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TypingStreamRow = namedtuple("TypingStreamRow", (
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"room_id", # str
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"user_ids", # list(str)
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))
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ReceiptsStreamRow = namedtuple("ReceiptsStreamRow", (
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"room_id", # str
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"receipt_type", # str
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"user_id", # str
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"event_id", # str
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"data", # dict
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))
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PushRulesStreamRow = namedtuple("PushRulesStreamRow", (
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"user_id", # str
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))
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PushersStreamRow = namedtuple("PushersStreamRow", (
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"user_id", # str
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"app_id", # str
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"pushkey", # str
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"deleted", # bool
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))
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CachesStreamRow = namedtuple("CachesStreamRow", (
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"cache_func", # str
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"keys", # list(str)
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"invalidation_ts", # int
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))
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PublicRoomsStreamRow = namedtuple("PublicRoomsStreamRow", (
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"room_id", # str
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"visibility", # str
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"appservice_id", # str, optional
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"network_id", # str, optional
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))
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DeviceListsStreamRow = namedtuple("DeviceListsStreamRow", (
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"user_id", # str
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"destination", # str
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))
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ToDeviceStreamRow = namedtuple("ToDeviceStreamRow", (
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"entity", # str
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))
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FederationStreamRow = namedtuple("FederationStreamRow", (
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"type", # str, the type of data as defined in the BaseFederationRows
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"data", # dict, serialization of a federation.send_queue.BaseFederationRow
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))
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TagAccountDataStreamRow = namedtuple("TagAccountDataStreamRow", (
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"user_id", # str
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"room_id", # str
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"data", # dict
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))
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AccountDataStreamRow = namedtuple("AccountDataStream", (
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"user_id", # str
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"room_id", # str
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"data_type", # str
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"data", # dict
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))
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CurrentStateDeltaStreamRow = namedtuple("CurrentStateDeltaStream", (
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"room_id", # str
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"type", # str
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"state_key", # str
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"event_id", # str, optional
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))
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GroupsStreamRow = namedtuple("GroupsStreamRow", (
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"group_id", # str
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"user_id", # str
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"type", # str
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"content", # dict
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))
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class Stream(object):
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"""Base class for the streams.
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Provides a `get_updates()` function that returns new updates since the last
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time it was called up until the point `advance_current_token` was called.
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"""
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NAME = None # The name of the stream
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ROW_TYPE = None # The type of the row
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_LIMITED = True # Whether the update function takes a limit
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def __init__(self, hs):
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# The token from which we last asked for updates
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self.last_token = self.current_token()
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# The token that we will get updates up to
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self.upto_token = self.current_token()
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def advance_current_token(self):
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"""Updates `upto_token` to "now", which updates up until which point
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get_updates[_since] will fetch rows till.
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"""
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self.upto_token = self.current_token()
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def discard_updates_and_advance(self):
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"""Called when the stream should advance but the updates would be discarded,
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e.g. when there are no currently connected workers.
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"""
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self.upto_token = self.current_token()
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self.last_token = self.upto_token
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@defer.inlineCallbacks
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def get_updates(self):
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"""Gets all updates since the last time this function was called (or
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since the stream was constructed if it hadn't been called before),
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until the `upto_token`
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Returns:
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(list(ROW_TYPE), int): list of updates plus the token used as an
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upper bound of the updates (i.e. the "current token")
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"""
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updates, current_token = yield self.get_updates_since(self.last_token)
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self.last_token = current_token
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defer.returnValue((updates, current_token))
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@defer.inlineCallbacks
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def get_updates_since(self, from_token):
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"""Like get_updates except allows specifying from when we should
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stream updates
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Returns:
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(list(ROW_TYPE), int): list of updates plus the token used as an
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upper bound of the updates (i.e. the "current token")
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"""
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if from_token in ("NOW", "now"):
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defer.returnValue(([], self.upto_token))
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current_token = self.upto_token
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from_token = int(from_token)
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if from_token == current_token:
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defer.returnValue(([], current_token))
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if self._LIMITED:
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rows = yield self.update_function(
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from_token, current_token,
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limit=MAX_EVENTS_BEHIND + 1,
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)
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# never turn more than MAX_EVENTS_BEHIND + 1 into updates.
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rows = itertools.islice(rows, MAX_EVENTS_BEHIND + 1)
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else:
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rows = yield self.update_function(
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from_token, current_token,
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)
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updates = [(row[0], self.ROW_TYPE(*row[1:])) for row in rows]
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# check we didn't get more rows than the limit.
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# doing it like this allows the update_function to be a generator.
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if self._LIMITED and len(updates) >= MAX_EVENTS_BEHIND:
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raise Exception("stream %s has fallen behind" % (self.NAME))
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defer.returnValue((updates, current_token))
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def current_token(self):
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"""Gets the current token of the underlying streams. Should be provided
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by the sub classes
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Returns:
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int
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"""
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raise NotImplementedError()
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def update_function(self, from_token, current_token, limit=None):
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"""Get updates between from_token and to_token. If Stream._LIMITED is
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True then limit is provided, otherwise it's not.
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Returns:
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Deferred(list(tuple)): the first entry in the tuple is the token for
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that update, and the rest of the tuple gets used to construct
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a ``ROW_TYPE`` instance
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"""
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raise NotImplementedError()
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class EventsStream(Stream):
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"""We received a new event, or an event went from being an outlier to not
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"""
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NAME = "events"
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ROW_TYPE = EventStreamRow
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def __init__(self, hs):
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store = hs.get_datastore()
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self.current_token = store.get_current_events_token
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self.update_function = store.get_all_new_forward_event_rows
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super(EventsStream, self).__init__(hs)
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class BackfillStream(Stream):
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"""We fetched some old events and either we had never seen that event before
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or it went from being an outlier to not.
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"""
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NAME = "backfill"
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ROW_TYPE = BackfillStreamRow
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def __init__(self, hs):
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store = hs.get_datastore()
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self.current_token = store.get_current_backfill_token
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self.update_function = store.get_all_new_backfill_event_rows
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super(BackfillStream, self).__init__(hs)
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class PresenceStream(Stream):
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NAME = "presence"
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_LIMITED = False
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ROW_TYPE = PresenceStreamRow
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def __init__(self, hs):
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store = hs.get_datastore()
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presence_handler = hs.get_presence_handler()
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self.current_token = store.get_current_presence_token
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self.update_function = presence_handler.get_all_presence_updates
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super(PresenceStream, self).__init__(hs)
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class TypingStream(Stream):
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NAME = "typing"
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_LIMITED = False
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ROW_TYPE = TypingStreamRow
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def __init__(self, hs):
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typing_handler = hs.get_typing_handler()
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self.current_token = typing_handler.get_current_token
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self.update_function = typing_handler.get_all_typing_updates
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super(TypingStream, self).__init__(hs)
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class ReceiptsStream(Stream):
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NAME = "receipts"
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ROW_TYPE = ReceiptsStreamRow
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def __init__(self, hs):
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store = hs.get_datastore()
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self.current_token = store.get_max_receipt_stream_id
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self.update_function = store.get_all_updated_receipts
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super(ReceiptsStream, self).__init__(hs)
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class PushRulesStream(Stream):
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"""A user has changed their push rules
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"""
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NAME = "push_rules"
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ROW_TYPE = PushRulesStreamRow
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def __init__(self, hs):
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self.store = hs.get_datastore()
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super(PushRulesStream, self).__init__(hs)
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def current_token(self):
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push_rules_token, _ = self.store.get_push_rules_stream_token()
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return push_rules_token
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@defer.inlineCallbacks
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def update_function(self, from_token, to_token, limit):
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rows = yield self.store.get_all_push_rule_updates(from_token, to_token, limit)
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defer.returnValue([(row[0], row[2]) for row in rows])
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class PushersStream(Stream):
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"""A user has added/changed/removed a pusher
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"""
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NAME = "pushers"
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ROW_TYPE = PushersStreamRow
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def __init__(self, hs):
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store = hs.get_datastore()
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self.current_token = store.get_pushers_stream_token
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self.update_function = store.get_all_updated_pushers_rows
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super(PushersStream, self).__init__(hs)
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class CachesStream(Stream):
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"""A cache was invalidated on the master and no other stream would invalidate
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the cache on the workers
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"""
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NAME = "caches"
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ROW_TYPE = CachesStreamRow
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def __init__(self, hs):
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store = hs.get_datastore()
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self.current_token = store.get_cache_stream_token
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self.update_function = store.get_all_updated_caches
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super(CachesStream, self).__init__(hs)
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class PublicRoomsStream(Stream):
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"""The public rooms list changed
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"""
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NAME = "public_rooms"
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ROW_TYPE = PublicRoomsStreamRow
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def __init__(self, hs):
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store = hs.get_datastore()
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self.current_token = store.get_current_public_room_stream_id
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self.update_function = store.get_all_new_public_rooms
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super(PublicRoomsStream, self).__init__(hs)
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class DeviceListsStream(Stream):
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"""Someone added/changed/removed a device
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"""
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NAME = "device_lists"
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_LIMITED = False
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ROW_TYPE = DeviceListsStreamRow
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def __init__(self, hs):
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store = hs.get_datastore()
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self.current_token = store.get_device_stream_token
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self.update_function = store.get_all_device_list_changes_for_remotes
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super(DeviceListsStream, self).__init__(hs)
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class ToDeviceStream(Stream):
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"""New to_device messages for a client
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"""
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NAME = "to_device"
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ROW_TYPE = ToDeviceStreamRow
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def __init__(self, hs):
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store = hs.get_datastore()
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self.current_token = store.get_to_device_stream_token
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self.update_function = store.get_all_new_device_messages
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super(ToDeviceStream, self).__init__(hs)
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class FederationStream(Stream):
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"""Data to be sent over federation. Only available when master has federation
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sending disabled.
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"""
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NAME = "federation"
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ROW_TYPE = FederationStreamRow
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def __init__(self, hs):
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federation_sender = hs.get_federation_sender()
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self.current_token = federation_sender.get_current_token
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self.update_function = federation_sender.get_replication_rows
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super(FederationStream, self).__init__(hs)
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class TagAccountDataStream(Stream):
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"""Someone added/removed a tag for a room
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"""
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NAME = "tag_account_data"
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ROW_TYPE = TagAccountDataStreamRow
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def __init__(self, hs):
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store = hs.get_datastore()
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self.current_token = store.get_max_account_data_stream_id
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self.update_function = store.get_all_updated_tags
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super(TagAccountDataStream, self).__init__(hs)
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class AccountDataStream(Stream):
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"""Global or per room account data was changed
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"""
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NAME = "account_data"
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ROW_TYPE = AccountDataStreamRow
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def __init__(self, hs):
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self.store = hs.get_datastore()
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self.current_token = self.store.get_max_account_data_stream_id
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super(AccountDataStream, self).__init__(hs)
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@defer.inlineCallbacks
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def update_function(self, from_token, to_token, limit):
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global_results, room_results = yield self.store.get_all_updated_account_data(
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from_token, from_token, to_token, limit
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)
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results = list(room_results)
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results.extend(
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(stream_id, user_id, None, account_data_type, content,)
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for stream_id, user_id, account_data_type, content in global_results
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)
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defer.returnValue(results)
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class CurrentStateDeltaStream(Stream):
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"""Current state for a room was changed
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"""
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NAME = "current_state_deltas"
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ROW_TYPE = CurrentStateDeltaStreamRow
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def __init__(self, hs):
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store = hs.get_datastore()
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self.current_token = store.get_max_current_state_delta_stream_id
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self.update_function = store.get_all_updated_current_state_deltas
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super(CurrentStateDeltaStream, self).__init__(hs)
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class GroupServerStream(Stream):
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NAME = "groups"
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ROW_TYPE = GroupsStreamRow
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def __init__(self, hs):
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store = hs.get_datastore()
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self.current_token = store.get_group_stream_token
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self.update_function = store.get_all_groups_changes
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super(GroupServerStream, self).__init__(hs)
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STREAMS_MAP = {
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stream.NAME: stream
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for stream in (
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EventsStream,
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BackfillStream,
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PresenceStream,
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TypingStream,
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ReceiptsStream,
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PushRulesStream,
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PushersStream,
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CachesStream,
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PublicRoomsStream,
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DeviceListsStream,
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ToDeviceStream,
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FederationStream,
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TagAccountDataStream,
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AccountDataStream,
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CurrentStateDeltaStream,
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GroupServerStream,
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)
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}
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