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Faster joins: parse msc3706 fields in send_join response (#12011)

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Part of my work on #11249: add code to handle the new fields added in MSC3706.
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Richard van der Hoff 2022-02-17 16:11:59 +00:00 committed by GitHub
parent 6127c4b9f1
commit da0e9f8efd
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6 changed files with 140 additions and 33 deletions
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1
changelog.d/12011.misc Normal file
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@ -0,0 +1 @@
Preparation for faster-room-join work: parse msc3706 fields in send_join response.

4
synapse/config/experimental.py
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@ -64,3 +64,7 @@ class ExperimentalConfig(Config):
# MSC3706 (server-side support for partial state in /send_join responses)
self.msc3706_enabled: bool = experimental.get("msc3706_enabled", False)
# experimental support for faster joins over federation (msc2775, msc3706)
# requires a target server with msc3706_enabled enabled.
self.faster_joins_enabled: bool = experimental.get("faster_joins", False)

15
synapse/federation/federation_client.py
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@ -1,4 +1,4 @@
# Copyright 2015-2021 The Matrix.org Foundation C.I.C.
# Copyright 2015-2022 The Matrix.org Foundation C.I.C.
# Copyright 2020 Sorunome
#
# Licensed under the Apache License, Version 2.0 (the "License");
@ -89,6 +89,12 @@ class SendJoinResult:
state: List[EventBase]
auth_chain: List[EventBase]
# True if 'state' elides non-critical membership events
partial_state: bool
# if 'partial_state' is set, a list of the servers in the room (otherwise empty)
servers_in_room: List[str]
class FederationClient(FederationBase):
def __init__(self, hs: "HomeServer"):
@ -876,11 +882,18 @@ class FederationClient(FederationBase):
% (auth_chain_create_events,)
)
if response.partial_state and not response.servers_in_room:
raise InvalidResponseError(
"partial_state was set, but no servers were listed in the room"
)
return SendJoinResult(
event=event,
state=signed_state,
auth_chain=signed_auth,
origin=destination,
partial_state=response.partial_state,
servers_in_room=response.servers_in_room or [],
)
# MSC3083 defines additional error codes for room joins.

118
synapse/federation/transport/client.py
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@ -1,4 +1,4 @@
# Copyright 2014-2021 The Matrix.org Foundation C.I.C.
# Copyright 2014-2022 The Matrix.org Foundation C.I.C.
# Copyright 2020 Sorunome
#
# Licensed under the Apache License, Version 2.0 (the "License");
@ -60,6 +60,7 @@ class TransportLayerClient:
def __init__(self, hs):
self.server_name = hs.hostname
self.client = hs.get_federation_http_client()
self._faster_joins_enabled = hs.config.experimental.faster_joins_enabled
async def get_room_state_ids(
self, destination: str, room_id: str, event_id: str
@ -336,10 +337,15 @@ class TransportLayerClient:
content: JsonDict,
) -> "SendJoinResponse":
path = _create_v2_path("/send_join/%s/%s", room_id, event_id)
query_params: Dict[str, str] = {}
if self._faster_joins_enabled:
# lazy-load state on join
query_params["org.matrix.msc3706.partial_state"] = "true"
return await self.client.put_json(
destination=destination,
path=path,
args=query_params,
data=content,
parser=SendJoinParser(room_version, v1_api=False),
max_response_size=MAX_RESPONSE_SIZE_SEND_JOIN,
@ -1271,6 +1277,12 @@ class SendJoinResponse:
# "event" is not included in the response.
event: Optional[EventBase] = None
# The room state is incomplete
partial_state: bool = False
# List of servers in the room
servers_in_room: Optional[List[str]] = None
@ijson.coroutine
def _event_parser(event_dict: JsonDict) -> Generator[None, Tuple[str, Any], None]:
@ -1297,6 +1309,32 @@ def _event_list_parser(
events.append(event)
@ijson.coroutine
def _partial_state_parser(response: SendJoinResponse) -> Generator[None, Any, None]:
"""Helper function for use with `ijson.items_coro`
Parses the partial_state field in send_join responses
"""
while True:
val = yield
if not isinstance(val, bool):
raise TypeError("partial_state must be a boolean")
response.partial_state = val
@ijson.coroutine
def _servers_in_room_parser(response: SendJoinResponse) -> Generator[None, Any, None]:
"""Helper function for use with `ijson.items_coro`
Parses the servers_in_room field in send_join responses
"""
while True:
val = yield
if not isinstance(val, list) or any(not isinstance(x, str) for x in val):
raise TypeError("servers_in_room must be a list of strings")
response.servers_in_room = val
class SendJoinParser(ByteParser[SendJoinResponse]):
"""A parser for the response to `/send_join` requests.
@ -1308,44 +1346,62 @@ class SendJoinParser(ByteParser[SendJoinResponse]):
CONTENT_TYPE = "application/json"
def __init__(self, room_version: RoomVersion, v1_api: bool):
self._response = SendJoinResponse([], [], {})
self._response = SendJoinResponse([], [], event_dict={})
self._room_version = room_version
self._coros = []
# The V1 API has the shape of `[200, {...}]`, which we handle by
# prefixing with `item.*`.
prefix = "item." if v1_api else ""
self._coro_state = ijson.items_coro(
_event_list_parser(room_version, self._response.state),
prefix + "state.item",
use_float=True,
)
self._coro_auth = ijson.items_coro(
_event_list_parser(room_version, self._response.auth_events),
prefix + "auth_chain.item",
use_float=True,
)
# TODO Remove the unstable prefix when servers have updated.
#
# By re-using the same event dictionary this will cause the parsing of
# org.matrix.msc3083.v2.event and event to stomp over each other.
# Generally this should be fine.
self._coro_unstable_event = ijson.kvitems_coro(
_event_parser(self._response.event_dict),
prefix + "org.matrix.msc3083.v2.event",
use_float=True,
)
self._coro_event = ijson.kvitems_coro(
_event_parser(self._response.event_dict),
prefix + "event",
use_float=True,
)
self._coros = [
ijson.items_coro(
_event_list_parser(room_version, self._response.state),
prefix + "state.item",
use_float=True,
),
ijson.items_coro(
_event_list_parser(room_version, self._response.auth_events),
prefix + "auth_chain.item",
use_float=True,
),
# TODO Remove the unstable prefix when servers have updated.
#
# By re-using the same event dictionary this will cause the parsing of
# org.matrix.msc3083.v2.event and event to stomp over each other.
# Generally this should be fine.
ijson.kvitems_coro(
_event_parser(self._response.event_dict),
prefix + "org.matrix.msc3083.v2.event",
use_float=True,
),
ijson.kvitems_coro(
_event_parser(self._response.event_dict),
prefix + "event",
use_float=True,
),
]
if not v1_api:
self._coros.append(
ijson.items_coro(
_partial_state_parser(self._response),
"org.matrix.msc3706.partial_state",
use_float="True",
)
)
self._coros.append(
ijson.items_coro(
_servers_in_room_parser(self._response),
"org.matrix.msc3706.servers_in_room",
use_float="True",
)
)
def write(self, data: bytes) -> int:
self._coro_state.send(data)
self._coro_auth.send(data)
self._coro_unstable_event.send(data)
self._coro_event.send(data)
for c in self._coros:
c.send(data)
return len(data)

3
synapse/python_dependencies.py
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@ -87,7 +87,8 @@ REQUIREMENTS = [
# We enforce that we have a `cryptography` version that bundles an `openssl`
# with the latest security patches.
"cryptography>=3.4.7",
"ijson>=3.1",
# ijson 3.1.4 fixes a bug with "." in property names
"ijson>=3.1.4",
"matrix-common~=1.1.0",
]

32
tests/federation/transport/test_client.py
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@ -62,3 +62,35 @@ class SendJoinParserTestCase(TestCase):
self.assertEqual(len(parsed_response.state), 1, parsed_response)
self.assertEqual(parsed_response.event_dict, {}, parsed_response)
self.assertIsNone(parsed_response.event, parsed_response)
self.assertFalse(parsed_response.partial_state, parsed_response)
self.assertEqual(parsed_response.servers_in_room, None, parsed_response)
def test_partial_state(self) -> None:
"""Check that the partial_state flag is correctly parsed"""
parser = SendJoinParser(RoomVersions.V1, False)
response = {
"org.matrix.msc3706.partial_state": True,
}
serialised_response = json.dumps(response).encode()
# Send data to the parser
parser.write(serialised_response)
# Retrieve and check the parsed SendJoinResponse
parsed_response = parser.finish()
self.assertTrue(parsed_response.partial_state)
def test_servers_in_room(self) -> None:
"""Check that the servers_in_room field is correctly parsed"""
parser = SendJoinParser(RoomVersions.V1, False)
response = {"org.matrix.msc3706.servers_in_room": ["hs1", "hs2"]}
serialised_response = json.dumps(response).encode()
# Send data to the parser
parser.write(serialised_response)
# Retrieve and check the parsed SendJoinResponse
parsed_response = parser.finish()
self.assertEqual(parsed_response.servers_in_room, ["hs1", "hs2"])