forked-synapse/synapse/replication/http/federation.py

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# Copyright 2018 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.
import logging
from typing import TYPE_CHECKING, List, Tuple
from twisted.web.server import Request
from synapse.api.room_versions import KNOWN_ROOM_VERSIONS, RoomVersion
from synapse.events import EventBase, make_event_from_dict
from synapse.events.snapshot import EventContext
from synapse.http.server import HttpServer
from synapse.replication.http._base import ReplicationEndpoint
from synapse.types import JsonDict
from synapse.util.metrics import Measure
if TYPE_CHECKING:
from synapse.server import HomeServer
from synapse.storage.databases.main import DataStore
logger = logging.getLogger(__name__)
class ReplicationFederationSendEventsRestServlet(ReplicationEndpoint):
"""Handles events newly received from federation, including persisting and
notifying. Returns the maximum stream ID of the persisted events.
The API looks like:
POST /_synapse/replication/fed_send_events/:txn_id
{
"events": [{
"event": { .. serialized event .. },
"room_version": .., // "1", "2", "3", etc: the version of the room
// containing the event
"event_format_version": .., // 1,2,3 etc: the event format version
"internal_metadata": { .. serialized internal_metadata .. },
"outlier": true|false,
"rejected_reason": .., // The event.rejected_reason field
"context": { .. serialized event context .. },
}],
"backfilled": false
}
200 OK
{
"max_stream_id": 32443,
}
Handle race between persisting an event and un-partial stating a room (#13100) Whenever we want to persist an event, we first compute an event context, which includes the state at the event and a flag indicating whether the state is partial. After a lot of processing, we finally try to store the event in the database, which can fail for partial state events when the containing room has been un-partial stated in the meantime. We detect the race as a foreign key constraint failure in the data store layer and turn it into a special `PartialStateConflictError` exception, which makes its way up to the method in which we computed the event context. To make things difficult, the exception needs to cross a replication request: `/fed_send_events` for events coming over federation and `/send_event` for events from clients. We transport the `PartialStateConflictError` as a `409 Conflict` over replication and turn `409`s back into `PartialStateConflictError`s on the worker making the request. All client events go through `EventCreationHandler.handle_new_client_event`, which is called in *a lot* of places. Instead of trying to update all the code which creates client events, we turn the `PartialStateConflictError` into a `429 Too Many Requests` in `EventCreationHandler.handle_new_client_event` and hope that clients take it as a hint to retry their request. On the federation event side, there are 7 places which compute event contexts. 4 of them use outlier event contexts: `FederationEventHandler._auth_and_persist_outliers_inner`, `FederationHandler.do_knock`, `FederationHandler.on_invite_request` and `FederationHandler.do_remotely_reject_invite`. These events won't have the partial state flag, so we do not need to do anything for then. The remaining 3 paths which create events are `FederationEventHandler.process_remote_join`, `FederationEventHandler.on_send_membership_event` and `FederationEventHandler._process_received_pdu`. We can't experience the race in `process_remote_join`, unless we're handling an additional join into a partial state room, which currently blocks, so we make no attempt to handle it correctly. `on_send_membership_event` is only called by `FederationServer._on_send_membership_event`, so we catch the `PartialStateConflictError` there and retry just once. `_process_received_pdu` is called by `on_receive_pdu` for incoming events and `_process_pulled_event` for backfill. The latter should never try to persist partial state events, so we ignore it. We catch the `PartialStateConflictError` in `on_receive_pdu` and retry just once. Refering to the graph of code paths in https://github.com/matrix-org/synapse/issues/12988#issuecomment-1156857648 may make the above make more sense. Signed-off-by: Sean Quah <seanq@matrix.org>
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Responds with a 409 when a `PartialStateConflictError` is raised due to an event
context that needs to be recomputed due to the un-partial stating of a room.
"""
NAME = "fed_send_events"
PATH_ARGS = ()
def __init__(self, hs: "HomeServer"):
super().__init__(hs)
self.store = hs.get_datastores().main
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self._storage_controllers = hs.get_storage_controllers()
self.clock = hs.get_clock()
self.federation_event_handler = hs.get_federation_event_handler()
@staticmethod
async def _serialize_payload( # type: ignore[override]
store: "DataStore",
room_id: str,
event_and_contexts: List[Tuple[EventBase, EventContext]],
backfilled: bool,
) -> JsonDict:
"""
Args:
store
room_id
event_and_contexts
backfilled: Whether or not the events are the result of backfilling
"""
event_payloads = []
for event, context in event_and_contexts:
serialized_context = await context.serialize(event, store)
event_payloads.append(
{
"event": event.get_pdu_json(),
"room_version": event.room_version.identifier,
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"event_format_version": event.format_version,
"internal_metadata": event.internal_metadata.get_dict(),
"outlier": event.internal_metadata.is_outlier(),
"rejected_reason": event.rejected_reason,
"context": serialized_context,
}
)
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payload = {
"events": event_payloads,
"backfilled": backfilled,
"room_id": room_id,
}
return payload
async def _handle_request(self, request: Request, content: JsonDict) -> Tuple[int, JsonDict]: # type: ignore[override]
with Measure(self.clock, "repl_fed_send_events_parse"):
room_id = content["room_id"]
backfilled = content["backfilled"]
event_payloads = content["events"]
event_and_contexts = []
for event_payload in event_payloads:
event_dict = event_payload["event"]
room_ver = KNOWN_ROOM_VERSIONS[event_payload["room_version"]]
internal_metadata = event_payload["internal_metadata"]
rejected_reason = event_payload["rejected_reason"]
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event = make_event_from_dict(
event_dict, room_ver, internal_metadata, rejected_reason
)
event.internal_metadata.outlier = event_payload["outlier"]
context = EventContext.deserialize(
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self._storage_controllers, event_payload["context"]
)
event_and_contexts.append((event, context))
logger.info("Got %d events from federation", len(event_and_contexts))
max_stream_id = await self.federation_event_handler.persist_events_and_notify(
room_id, event_and_contexts, backfilled
)
return 200, {"max_stream_id": max_stream_id}
class ReplicationFederationSendEduRestServlet(ReplicationEndpoint):
"""Handles EDUs newly received from federation, including persisting and
notifying.
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Request format:
POST /_synapse/replication/fed_send_edu/:edu_type/:txn_id
{
"origin": ...,
"content: { ... }
}
"""
NAME = "fed_send_edu"
PATH_ARGS = ("edu_type",)
def __init__(self, hs: "HomeServer"):
super().__init__(hs)
self.store = hs.get_datastores().main
self.clock = hs.get_clock()
self.registry = hs.get_federation_registry()
@staticmethod
async def _serialize_payload( # type: ignore[override]
edu_type: str, origin: str, content: JsonDict
) -> JsonDict:
return {"origin": origin, "content": content}
async def _handle_request( # type: ignore[override]
self, request: Request, content: JsonDict, edu_type: str
) -> Tuple[int, JsonDict]:
origin = content["origin"]
edu_content = content["content"]
logger.info("Got %r edu from %s", edu_type, origin)
await self.registry.on_edu(edu_type, origin, edu_content)
return 200, {}
class ReplicationGetQueryRestServlet(ReplicationEndpoint):
"""Handle responding to queries from federation.
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Request format:
POST /_synapse/replication/fed_query/:query_type
{
"args": { ... }
}
"""
NAME = "fed_query"
PATH_ARGS = ("query_type",)
# This is a query, so let's not bother caching
CACHE = False
def __init__(self, hs: "HomeServer"):
super().__init__(hs)
self.store = hs.get_datastores().main
self.clock = hs.get_clock()
self.registry = hs.get_federation_registry()
@staticmethod
async def _serialize_payload(query_type: str, args: JsonDict) -> JsonDict: # type: ignore[override]
"""
Args:
query_type
args: The arguments received for the given query type
"""
return {"args": args}
async def _handle_request( # type: ignore[override]
self, request: Request, content: JsonDict, query_type: str
) -> Tuple[int, JsonDict]:
args = content["args"]
args["origin"] = content["origin"]
logger.info("Got %r query from %s", query_type, args["origin"])
result = await self.registry.on_query(query_type, args)
return 200, result
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class ReplicationCleanRoomRestServlet(ReplicationEndpoint):
"""Called to clean up any data in DB for a given room, ready for the
server to join the room.
Request format:
POST /_synapse/replication/fed_cleanup_room/:room_id/:txn_id
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{}
"""
NAME = "fed_cleanup_room"
PATH_ARGS = ("room_id",)
def __init__(self, hs: "HomeServer"):
super().__init__(hs)
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self.store = hs.get_datastores().main
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@staticmethod
async def _serialize_payload(room_id: str) -> JsonDict: # type: ignore[override]
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"""
Args:
room_id
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"""
return {}
async def _handle_request( # type: ignore[override]
self, request: Request, content: JsonDict, room_id: str
) -> Tuple[int, JsonDict]:
await self.store.clean_room_for_join(room_id)
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return 200, {}
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class ReplicationStoreRoomOnOutlierMembershipRestServlet(ReplicationEndpoint):
"""Called to clean up any data in DB for a given room, ready for the
server to join the room.
Request format:
POST /_synapse/replication/store_room_on_outlier_membership/:room_id/:txn_id
{
"room_version": "1",
}
"""
NAME = "store_room_on_outlier_membership"
PATH_ARGS = ("room_id",)
def __init__(self, hs: "HomeServer"):
super().__init__(hs)
self.store = hs.get_datastores().main
@staticmethod
async def _serialize_payload(room_id: str, room_version: RoomVersion) -> JsonDict: # type: ignore[override]
return {"room_version": room_version.identifier}
async def _handle_request( # type: ignore[override]
self, request: Request, content: JsonDict, room_id: str
) -> Tuple[int, JsonDict]:
room_version = KNOWN_ROOM_VERSIONS[content["room_version"]]
await self.store.maybe_store_room_on_outlier_membership(room_id, room_version)
return 200, {}
def register_servlets(hs: "HomeServer", http_server: HttpServer) -> None:
ReplicationFederationSendEventsRestServlet(hs).register(http_server)
ReplicationFederationSendEduRestServlet(hs).register(http_server)
ReplicationGetQueryRestServlet(hs).register(http_server)
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ReplicationCleanRoomRestServlet(hs).register(http_server)
ReplicationStoreRoomOnOutlierMembershipRestServlet(hs).register(http_server)