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# Copyright 2020 The Matrix.org Foundation C.I.C.
#
# 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.
import logging
from typing import TYPE_CHECKING
from synapse.api.errors import SynapseError
from synapse.http.servlet import parse_integer
from synapse.replication.http._base import ReplicationEndpoint
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"
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(stream_name, from_token, upto_token):
return {"from_token": from_token, "upto_token": upto_token}
async def _handle_request(self, request, stream_name):
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):
ReplicationGetStreamUpdates(hs).register(http_server)
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