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#
# This file is licensed under the Affero General Public License (AGPL) version 3.
#
# Copyright 2020 The Matrix.org Foundation C.I.C.
# Copyright (C) 2023 New Vector, Ltd
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU Affero General Public License as
# published by the Free Software Foundation, either version 3 of the
# License, or (at your option) any later version.
#
# See the GNU Affero General Public License for more details:
# <https://www.gnu.org/licenses/agpl-3.0.html>.
#
# Originally licensed under the Apache License, Version 2.0:
# <http://www.apache.org/licenses/LICENSE-2.0>.
#
# [This file includes modifications made by New Vector Limited]
#
#
import logging
from typing import TYPE_CHECKING, Tuple
from twisted.web.server import Request
from synapse.api.errors import SynapseError
from synapse.http.server import HttpServer
from synapse.http.servlet import parse_integer
from synapse.replication.http._base import ReplicationEndpoint
from synapse.types import JsonDict
if TYPE_CHECKING:
from synapse.server import HomeServer
logger = logging.getLogger(__name__)
class ReplicationGetStreamUpdates(ReplicationEndpoint):
"""Fetches stream updates from a server. Used for streams not persisted to
the database, e.g. typing notifications.
The API looks like:
GET /_synapse/replication/get_repl_stream_updates/<stream name>?from_token=0&to_token=10
200 OK
{
updates: [ ... ],
upto_token: 10,
limited: False,
}
If there are more rows than can sensibly be returned in one lump, `limited` will be
set to true, and the caller should call again with a new `from_token`.
"""
NAME = "get_repl_stream_updates"
PATH_ARGS = ("stream_name",)
METHOD = "GET"
# We don't want to wait for replication streams to catch up, as this gets
# called in the process of catching replication streams up.
WAIT_FOR_STREAMS = False
def __init__(self, hs: "HomeServer"):
super().__init__(hs)
self._instance_name = hs.get_instance_name()
self.streams = hs.get_replication_streams()
@staticmethod
async def _serialize_payload( # type: ignore[override]
stream_name: str, from_token: int, upto_token: int
) -> JsonDict:
return {"from_token": from_token, "upto_token": upto_token}
async def _handle_request( # type: ignore[override]
self, request: Request, content: JsonDict, stream_name: str
) -> Tuple[int, JsonDict]:
stream = self.streams.get(stream_name)
if stream is None:
raise SynapseError(400, "Unknown stream")
from_token = parse_integer(request, "from_token", required=True)
upto_token = parse_integer(request, "upto_token", required=True)
updates, upto_token, limited = await stream.get_updates_since(
self._instance_name, from_token, upto_token
)
return (
200,
{"updates": updates, "upto_token": upto_token, "limited": limited},
)
def register_servlets(hs: "HomeServer", http_server: HttpServer) -> None:
ReplicationGetStreamUpdates(hs).register(http_server)
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