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# Copyright 2022 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, List, Tuple
from twisted.web.server import Request
from synapse.api.room_versions import KNOWN_ROOM_VERSIONS
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, Requester, UserID
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 ReplicationSendEventsRestServlet(ReplicationEndpoint):
"""Handles batches of newly created events on workers, including persisting and
notifying.
The API looks like:
POST /_synapse/replication/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 .. },
"requester": { .. serialized requester .. },
"ratelimit": true,
}]
}
200 OK
{ "stream_id": 12345, "event_id": "$abcdef..." }
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 = "send_events"
PATH_ARGS = ()
def __init__(self, hs: "HomeServer"):
super().__init__(hs)
self.event_creation_handler = hs.get_event_creation_handler()
self.store = hs.get_datastores().main
self._storage_controllers = hs.get_storage_controllers()
self.clock = hs.get_clock()
@staticmethod
async def _serialize_payload( # type: ignore[override]
events_and_context: List[Tuple[EventBase, EventContext]],
store: "DataStore",
requester: Requester,
ratelimit: bool,
extra_users: List[UserID],
) -> JsonDict:
"""
Args:
store
requester
events_and_ctx
ratelimit
"""
serialized_events = []
for event, context in events_and_context:
serialized_context = await context.serialize(event, store)
serialized_event = {
"event": event.get_pdu_json(),
"room_version": event.room_version.identifier,
"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,
"requester": requester.serialize(),
"ratelimit": ratelimit,
"extra_users": [u.to_string() for u in extra_users],
}
serialized_events.append(serialized_event)
payload = {"events": serialized_events}
return payload
async def _handle_request( # type: ignore[override]
self, request: Request, payload: JsonDict
) -> Tuple[int, JsonDict]:
with Measure(self.clock, "repl_send_events_parse"):
events_and_context = []
events = payload["events"]
rooms = set()
for event_payload in events:
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"]
event = make_event_from_dict(
event_dict, room_ver, internal_metadata, rejected_reason
)
event.internal_metadata.outlier = event_payload["outlier"]
requester = Requester.deserialize(
self.store, event_payload["requester"]
)
context = EventContext.deserialize(
self._storage_controllers, event_payload["context"]
)
ratelimit = event_payload["ratelimit"]
events_and_context.append((event, context))
extra_users = [
UserID.from_string(u) for u in event_payload["extra_users"]
]
# all the rooms *should* be the same, but we'll log separately to be
# sure.
rooms.add(event.room_id)
logger.info(
"Got batch of %i events to persist to rooms %s", len(events), rooms
)
last_event = (
await self.event_creation_handler.persist_and_notify_client_events(
requester, events_and_context, ratelimit, extra_users
)
)
return (
200,
{
"stream_id": last_event.internal_metadata.stream_ordering,
"event_id": last_event.event_id,
},
)
def register_servlets(hs: "HomeServer", http_server: HttpServer) -> None:
ReplicationSendEventsRestServlet(hs).register(http_server)
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