67ff7b8ba0
The general idea here is to get rid of the type: ignore annotations on all of the current_token and update_function assignments, which would have caught #7290. After a bit of experimentation, it seems like the least-awful way to do this is to pass the offending functions in as parameters to the Stream constructor. Unfortunately that means that the concrete implementations no longer have the same constructor signature as Stream itself, which means that it gets hard to correctly annotate STREAMS_MAP. I've also introduced a couple of new types, to take out some duplication.
542 lines
16 KiB
Python
542 lines
16 KiB
Python
# -*- coding: utf-8 -*-
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# Copyright 2017 Vector Creations Ltd
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# Copyright 2019 New Vector 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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import logging
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from collections import namedtuple
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from typing import Any, Awaitable, Callable, Iterable, List, Optional, Tuple
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import attr
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from synapse.replication.http.streams import ReplicationGetStreamUpdates
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logger = logging.getLogger(__name__)
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MAX_EVENTS_BEHIND = 500000
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# Some type aliases to make things a bit easier.
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# A stream position token
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Token = int
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# The type of a stream update row, after JSON deserialisation, but before
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# parsing with Stream.parse_row (which turns it into a `ROW_TYPE`). Normally it's
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# just a row from a database query, though this is dependent on the stream in question.
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#
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StreamRow = Tuple
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# The type returned by the update_function of a stream, as well as get_updates(),
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# get_updates_since, etc.
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#
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# It consists of a triplet `(updates, new_last_token, limited)`, where:
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# * `updates` is a list of `(token, row)` entries.
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# * `new_last_token` is the new position in stream.
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# * `limited` is whether there are more updates to fetch.
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#
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StreamUpdateResult = Tuple[List[Tuple[Token, StreamRow]], Token, bool]
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# The type of an update_function for a stream
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#
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# The arguments are:
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#
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# * from_token: the previous stream token: the starting point for fetching the
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# updates
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# * to_token: the new stream token: the point to get updates up to
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# * limit: the maximum number of rows to return
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#
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UpdateFunction = Callable[[Token, Token, int], Awaitable[StreamUpdateResult]]
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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.
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"""
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NAME = None # type: str # The name of the stream
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# The type of the row. Used by the default impl of parse_row.
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ROW_TYPE = None # type: Any
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@classmethod
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def parse_row(cls, row: StreamRow):
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"""Parse a row received over replication
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By default, assumes that the row data is an array object and passes its contents
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to the constructor of the ROW_TYPE for this stream.
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Args:
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row: row data from the incoming RDATA command, after json decoding
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Returns:
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ROW_TYPE object for this stream
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"""
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return cls.ROW_TYPE(*row)
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def __init__(
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self,
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current_token_function: Callable[[], Token],
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update_function: UpdateFunction,
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):
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"""Instantiate a Stream
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current_token_function and update_function are callbacks which should be
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implemented by subclasses.
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current_token_function is called to get the current token of the underlying
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stream.
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update_function is called to get updates for this stream between a pair of
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stream tokens. See the UpdateFunction type definition for more info.
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Args:
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current_token_function: callback to get the current token, as above
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update_function: callback go get stream updates, as above
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"""
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self.current_token = current_token_function
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self.update_function = update_function
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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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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.last_token = self.current_token()
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async def get_updates(self) -> StreamUpdateResult:
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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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Returns:
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A triplet `(updates, new_last_token, limited)`, where `updates` is
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a list of `(token, row)` entries, `new_last_token` is the new
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position in stream, and `limited` is whether there are more updates
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to fetch.
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"""
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current_token = self.current_token()
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updates, current_token, limited = await self.get_updates_since(
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self.last_token, current_token
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)
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self.last_token = current_token
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return updates, current_token, limited
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async def get_updates_since(
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self, from_token: Token, upto_token: Token, limit: int = 100
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) -> StreamUpdateResult:
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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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A triplet `(updates, new_last_token, limited)`, where `updates` is
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a list of `(token, row)` entries, `new_last_token` is the new
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position in stream, and `limited` is whether there are more updates
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to fetch.
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"""
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from_token = int(from_token)
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if from_token == upto_token:
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return [], upto_token, False
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updates, upto_token, limited = await self.update_function(
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from_token, upto_token, limit,
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)
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return updates, upto_token, limited
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def db_query_to_update_function(
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query_function: Callable[[Token, Token, int], Awaitable[Iterable[tuple]]]
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) -> UpdateFunction:
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"""Wraps a db query function which returns a list of rows to make it
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suitable for use as an `update_function` for the Stream class
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"""
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async def update_function(from_token, upto_token, limit):
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rows = await query_function(from_token, upto_token, limit)
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updates = [(row[0], row[1:]) for row in rows]
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limited = False
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if len(updates) == limit:
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upto_token = updates[-1][0]
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limited = True
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assert len(updates) <= limit
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return updates, upto_token, limited
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return update_function
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def make_http_update_function(hs, stream_name: str) -> UpdateFunction:
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"""Makes a suitable function for use as an `update_function` that queries
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the master process for updates.
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"""
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client = ReplicationGetStreamUpdates.make_client(hs)
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async def update_function(
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from_token: int, upto_token: int, limit: int
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) -> StreamUpdateResult:
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result = await client(
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stream_name=stream_name,
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from_token=from_token,
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upto_token=upto_token,
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limit=limit,
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)
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return result["updates"], result["upto_token"], result["limited"]
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return update_function
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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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BackfillStreamRow = namedtuple(
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"BackfillStreamRow",
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(
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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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"relates_to", # str, optional
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),
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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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super().__init__(
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store.get_current_backfill_token,
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db_query_to_update_function(store.get_all_new_backfill_event_rows),
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)
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class PresenceStream(Stream):
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PresenceStreamRow = namedtuple(
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"PresenceStreamRow",
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(
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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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)
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NAME = "presence"
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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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if hs.config.worker_app is None:
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# on the master, query the presence handler
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presence_handler = hs.get_presence_handler()
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update_function = db_query_to_update_function(
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presence_handler.get_all_presence_updates
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)
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else:
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# Query master process
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update_function = make_http_update_function(hs, self.NAME)
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super().__init__(store.get_current_presence_token, update_function)
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class TypingStream(Stream):
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TypingStreamRow = namedtuple(
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"TypingStreamRow", ("room_id", "user_ids") # str # list(str)
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)
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NAME = "typing"
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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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if hs.config.worker_app is None:
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# on the master, query the typing handler
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update_function = db_query_to_update_function(
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typing_handler.get_all_typing_updates
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)
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else:
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# Query master process
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update_function = make_http_update_function(hs, self.NAME)
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super().__init__(typing_handler.get_current_token, update_function)
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class ReceiptsStream(Stream):
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ReceiptsStreamRow = namedtuple(
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"ReceiptsStreamRow",
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(
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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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)
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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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super().__init__(
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store.get_max_receipt_stream_id,
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db_query_to_update_function(store.get_all_updated_receipts),
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)
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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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PushRulesStreamRow = namedtuple("PushRulesStreamRow", ("user_id",)) # str
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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__(
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self._current_token, self._update_function
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)
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def _current_token(self) -> int:
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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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async def _update_function(self, from_token: Token, to_token: Token, limit: int):
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rows = await self.store.get_all_push_rule_updates(from_token, to_token, limit)
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limited = False
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if len(rows) == limit:
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to_token = rows[-1][0]
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limited = True
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return [(row[0], (row[2],)) for row in rows], to_token, limited
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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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PushersStreamRow = namedtuple(
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"PushersStreamRow",
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("user_id", "app_id", "pushkey", "deleted"), # str # str # str # bool
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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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super().__init__(
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store.get_pushers_stream_token,
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db_query_to_update_function(store.get_all_updated_pushers_rows),
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)
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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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@attr.s
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class CachesStreamRow:
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"""Stream to inform workers they should invalidate their cache.
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Attributes:
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cache_func: Name of the cached function.
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keys: The entry in the cache to invalidate. If None then will
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invalidate all.
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invalidation_ts: Timestamp of when the invalidation took place.
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"""
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cache_func = attr.ib(type=str)
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keys = attr.ib(type=Optional[List[Any]])
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invalidation_ts = attr.ib(type=int)
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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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super().__init__(
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store.get_cache_stream_token,
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db_query_to_update_function(store.get_all_updated_caches),
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)
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class PublicRoomsStream(Stream):
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"""The public rooms list changed
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"""
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PublicRoomsStreamRow = namedtuple(
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"PublicRoomsStreamRow",
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(
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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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)
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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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super().__init__(
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store.get_current_public_room_stream_id,
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db_query_to_update_function(store.get_all_new_public_rooms),
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)
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class DeviceListsStream(Stream):
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"""Either a user has updated their devices or a remote server needs to be
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told about a device update.
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"""
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@attr.s
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class DeviceListsStreamRow:
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entity = attr.ib(type=str)
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NAME = "device_lists"
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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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super().__init__(
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store.get_device_stream_token,
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db_query_to_update_function(store.get_all_device_list_changes_for_remotes),
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)
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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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ToDeviceStreamRow = namedtuple("ToDeviceStreamRow", ("entity",)) # str
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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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super().__init__(
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store.get_to_device_stream_token,
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db_query_to_update_function(store.get_all_new_device_messages),
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)
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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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TagAccountDataStreamRow = namedtuple(
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"TagAccountDataStreamRow", ("user_id", "room_id", "data") # str # str # dict
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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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super().__init__(
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store.get_max_account_data_stream_id,
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db_query_to_update_function(store.get_all_updated_tags),
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)
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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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AccountDataStreamRow = namedtuple(
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"AccountDataStream", ("user_id", "room_id", "data_type") # str # str # str
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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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super().__init__(
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self.store.get_max_account_data_stream_id,
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db_query_to_update_function(self._update_function),
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)
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async def _update_function(self, from_token, to_token, limit):
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global_results, room_results = await 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)
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for stream_id, user_id, account_data_type in global_results
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)
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return results
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class GroupServerStream(Stream):
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GroupsStreamRow = namedtuple(
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"GroupsStreamRow",
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("group_id", "user_id", "type", "content"), # str # str # str # dict
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)
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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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super().__init__(
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store.get_group_stream_token,
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db_query_to_update_function(store.get_all_groups_changes),
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)
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class UserSignatureStream(Stream):
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"""A user has signed their own device with their user-signing key
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"""
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UserSignatureStreamRow = namedtuple("UserSignatureStreamRow", ("user_id")) # str
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NAME = "user_signature"
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ROW_TYPE = UserSignatureStreamRow
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def __init__(self, hs):
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store = hs.get_datastore()
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super().__init__(
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store.get_device_stream_token,
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db_query_to_update_function(
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store.get_all_user_signature_changes_for_remotes
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),
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)
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