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# Copyright 2017 Vector Creations Ltd
# Copyright 2019 New Vector Ltd
#
# 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 collections import namedtuple
from typing import TYPE_CHECKING, Any, Awaitable, Callable, List, Tuple
from synapse.replication.tcp.streams._base import (
Stream,
current_token_without_instance,
make_http_update_function,
)
if TYPE_CHECKING:
from synapse.server import HomeServer
class FederationStream(Stream):
"""Data to be sent over federation. Only available when master has federation
sending disabled.
"""
FederationStreamRow = namedtuple(
"FederationStreamRow",
(
"type", # str, the type of data as defined in the BaseFederationRows
"data", # dict, serialization of a federation.send_queue.BaseFederationRow
),
)
NAME = "federation"
ROW_TYPE = FederationStreamRow
def __init__(self, hs: "HomeServer"):
if hs.config.worker_app is None:
# master process: get updates from the FederationRemoteSendQueue.
# (if the master is configured to send federation itself, federation_sender
# will be a real FederationSender, which has stubs for current_token and
# get_replication_rows.)
federation_sender = hs.get_federation_sender()
current_token = current_token_without_instance(
federation_sender.get_current_token
)
update_function: Callable[
[str, int, int, int], Awaitable[Tuple[List[Tuple[int, Any]], int, bool]]
] = federation_sender.get_replication_rows
elif hs.should_send_federation():
# federation sender: Query master process
update_function = make_http_update_function(hs, self.NAME)
current_token = self._stub_current_token
else:
# other worker: stub out the update function (we're not interested in
# any updates so when we get a POSITION we do nothing)
update_function = self._stub_update_function
current_token = self._stub_current_token
super().__init__(hs.get_instance_name(), current_token, update_function)
@staticmethod
def _stub_current_token(instance_name: str) -> int:
# dummy current-token method for use on workers
return 0
@staticmethod
async def _stub_update_function(
instance_name: str, from_token: int, upto_token: int, limit: int
) -> Tuple[list, int, bool]:
return [], upto_token, False
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