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#
# This file is licensed under the Affero General Public License (AGPL) version 3.
#
# 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]
#
#
from typing import TYPE_CHECKING, Any, Awaitable, Callable, List, Tuple
import attr
from synapse.replication.tcp.streams._base import (
Stream,
Token,
current_token_without_instance,
make_http_update_function,
)
from synapse.types import JsonDict
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.
"""
@attr.s(slots=True, frozen=True, auto_attribs=True)
class FederationStreamRow:
type: str # the type of data as defined in the BaseFederationRows
data: JsonDict # serialization of a federation.send_queue.BaseFederationRow
NAME = "federation"
ROW_TYPE = FederationStreamRow
def __init__(self, hs: "HomeServer"):
if hs.config.worker.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()
self.current_token_func = 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)
self.current_token_func = 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
self.current_token_func = self._stub_current_token
super().__init__(hs.get_instance_name(), update_function)
def current_token(self, instance_name: str) -> Token:
return self.current_token_func(instance_name)
def minimal_local_current_token(self) -> Token:
return self.current_token(self.local_instance_name)
@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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