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forked-synapse/synapse/rest/client/sync.py
Patrick Cloke 6bf81a7a61
Bundle aggregations outside of the serialization method. (#11612) 
This makes the serialization of events synchronous (and it no
longer access the database), but we must manually calculate and
provide the bundled aggregations.

Overall this should cause no change in behavior, but is prep work
for other improvements.
2022-01-07 09:10:46 -05:00

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# Copyright 2015, 2016 OpenMarket 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 itertools
import logging
from collections import defaultdict
from typing import (
TYPE_CHECKING,
Any,
Callable,
Dict,
Iterable,
List,
Optional,
Tuple,
Union,
)
from synapse.api.constants import Membership, PresenceState
from synapse.api.errors import Codes, StoreError, SynapseError
from synapse.api.filtering import FilterCollection
from synapse.api.presence import UserPresenceState
from synapse.events import EventBase
from synapse.events.utils import (
format_event_for_client_v2_without_room_id,
format_event_raw,
)
from synapse.handlers.presence import format_user_presence_state
from synapse.handlers.sync import (
ArchivedSyncResult,
InvitedSyncResult,
JoinedSyncResult,
KnockedSyncResult,
SyncConfig,
SyncResult,
)
from synapse.http.server import HttpServer
from synapse.http.servlet import RestServlet, parse_boolean, parse_integer, parse_string
from synapse.http.site import SynapseRequest
from synapse.logging.opentracing import trace
from synapse.types import JsonDict, StreamToken
from synapse.util import json_decoder
from ._base import client_patterns, set_timeline_upper_limit
if TYPE_CHECKING:
from synapse.server import HomeServer
logger = logging.getLogger(__name__)
class SyncRestServlet(RestServlet):
"""
GET parameters::
timeout(int): How long to wait for new events in milliseconds.
since(batch_token): Batch token when asking for incremental deltas.
set_presence(str): What state the device presence should be set to.
default is "online".
filter(filter_id): A filter to apply to the events returned.
Response JSON::
{
"next_batch": // batch token for the next /sync
"presence": // presence data for the user.
"rooms": {
"join": { // Joined rooms being updated.
"${room_id}": { // Id of the room being updated
"event_map": // Map of EventID -> event JSON.
"timeline": { // The recent events in the room if gap is "true"
"limited": // Was the per-room event limit exceeded?
// otherwise the next events in the room.
"events": [] // list of EventIDs in the "event_map".
"prev_batch": // back token for getting previous events.
}
"state": {"events": []} // list of EventIDs updating the
// current state to be what it should
// be at the end of the batch.
"ephemeral": {"events": []} // list of event objects
}
},
"invite": {}, // Invited rooms being updated.
"leave": {} // Archived rooms being updated.
}
}
"""
PATTERNS = client_patterns("/sync$")
ALLOWED_PRESENCE = {"online", "offline", "unavailable"}
def __init__(self, hs: "HomeServer"):
super().__init__()
self.hs = hs
self.auth = hs.get_auth()
self.store = hs.get_datastore()
self.sync_handler = hs.get_sync_handler()
self.clock = hs.get_clock()
self.filtering = hs.get_filtering()
self.presence_handler = hs.get_presence_handler()
self._server_notices_sender = hs.get_server_notices_sender()
self._event_serializer = hs.get_event_client_serializer()
async def on_GET(self, request: SynapseRequest) -> Tuple[int, JsonDict]:
# This will always be set by the time Twisted calls us.
assert request.args is not None
if b"from" in request.args:
# /events used to use 'from', but /sync uses 'since'.
# Lets be helpful and whine if we see a 'from'.
raise SynapseError(
400, "'from' is not a valid query parameter. Did you mean 'since'?"
)
requester = await self.auth.get_user_by_req(request, allow_guest=True)
user = requester.user
device_id = requester.device_id
timeout = parse_integer(request, "timeout", default=0)
since = parse_string(request, "since")
set_presence = parse_string(
request,
"set_presence",
default="online",
allowed_values=self.ALLOWED_PRESENCE,
)
filter_id = parse_string(request, "filter")
full_state = parse_boolean(request, "full_state", default=False)
logger.debug(
"/sync: user=%r, timeout=%r, since=%r, "
"set_presence=%r, filter_id=%r, device_id=%r",
user,
timeout,
since,
set_presence,
filter_id,
device_id,
)
request_key = (user, timeout, since, filter_id, full_state, device_id)
if filter_id is None:
filter_collection = self.filtering.DEFAULT_FILTER_COLLECTION
elif filter_id.startswith("{"):
try:
filter_object = json_decoder.decode(filter_id)
set_timeline_upper_limit(
filter_object, self.hs.config.server.filter_timeline_limit
)
except Exception:
raise SynapseError(400, "Invalid filter JSON")
self.filtering.check_valid_filter(filter_object)
filter_collection = FilterCollection(self.hs, filter_object)
else:
try:
filter_collection = await self.filtering.get_user_filter(
user.localpart, filter_id
)
except StoreError as err:
if err.code != 404:
raise
# fix up the description and errcode to be more useful
raise SynapseError(400, "No such filter", errcode=Codes.INVALID_PARAM)
sync_config = SyncConfig(
user=user,
filter_collection=filter_collection,
is_guest=requester.is_guest,
request_key=request_key,
device_id=device_id,
)
since_token = None
if since is not None:
since_token = await StreamToken.from_string(self.store, since)
# send any outstanding server notices to the user.
await self._server_notices_sender.on_user_syncing(user.to_string())
affect_presence = set_presence != PresenceState.OFFLINE
if affect_presence:
await self.presence_handler.set_state(
user, {"presence": set_presence}, True
)
context = await self.presence_handler.user_syncing(
user.to_string(), affect_presence=affect_presence
)
with context:
sync_result = await self.sync_handler.wait_for_sync_for_user(
requester,
sync_config,
since_token=since_token,
timeout=timeout,
full_state=full_state,
)
# the client may have disconnected by now; don't bother to serialize the
# response if so.
if request._disconnected:
logger.info("Client has disconnected; not serializing response.")
return 200, {}
time_now = self.clock.time_msec()
# We know that the the requester has an access token since appservices
# cannot use sync.
response_content = await self.encode_response(
time_now, sync_result, requester.access_token_id, filter_collection
)
logger.debug("Event formatting complete")
return 200, response_content
@trace(opname="sync.encode_response")
async def encode_response(
self,
time_now: int,
sync_result: SyncResult,
access_token_id: Optional[int],
filter: FilterCollection,
) -> JsonDict:
logger.debug("Formatting events in sync response")
if filter.event_format == "client":
event_formatter = format_event_for_client_v2_without_room_id
elif filter.event_format == "federation":
event_formatter = format_event_raw
else:
raise Exception("Unknown event format %s" % (filter.event_format,))
joined = await self.encode_joined(
sync_result.joined,
time_now,
access_token_id,
filter.event_fields,
event_formatter,
)
invited = await self.encode_invited(
sync_result.invited, time_now, access_token_id, event_formatter
)
knocked = await self.encode_knocked(
sync_result.knocked, time_now, access_token_id, event_formatter
)
archived = await self.encode_archived(
sync_result.archived,
time_now,
access_token_id,
filter.event_fields,
event_formatter,
)
logger.debug("building sync response dict")
response: JsonDict = defaultdict(dict)
response["next_batch"] = await sync_result.next_batch.to_string(self.store)
if sync_result.account_data:
response["account_data"] = {"events": sync_result.account_data}
if sync_result.presence:
response["presence"] = SyncRestServlet.encode_presence(
sync_result.presence, time_now
)
if sync_result.to_device:
response["to_device"] = {"events": sync_result.to_device}
if sync_result.device_lists.changed:
response["device_lists"]["changed"] = list(sync_result.device_lists.changed)
if sync_result.device_lists.left:
response["device_lists"]["left"] = list(sync_result.device_lists.left)
# We always include this because https://github.com/vector-im/element-android/issues/3725
# The spec isn't terribly clear on when this can be omitted and how a client would tell
# the difference between "no keys present" and "nothing changed" in terms of whole field
# absent / individual key type entry absent
# Corresponding synapse issue: https://github.com/matrix-org/synapse/issues/10456
response["device_one_time_keys_count"] = sync_result.device_one_time_keys_count
# https://github.com/matrix-org/matrix-doc/blob/54255851f642f84a4f1aaf7bc063eebe3d76752b/proposals/2732-olm-fallback-keys.md
# states that this field should always be included, as long as the server supports the feature.
response[
"org.matrix.msc2732.device_unused_fallback_key_types"
] = sync_result.device_unused_fallback_key_types
response[
"device_unused_fallback_key_types"
] = sync_result.device_unused_fallback_key_types
if joined:
response["rooms"][Membership.JOIN] = joined
if invited:
response["rooms"][Membership.INVITE] = invited
if knocked:
response["rooms"][Membership.KNOCK] = knocked
if archived:
response["rooms"][Membership.LEAVE] = archived
# By the time we get here groups is no longer optional.
assert sync_result.groups is not None
if sync_result.groups.join:
response["groups"][Membership.JOIN] = sync_result.groups.join
if sync_result.groups.invite:
response["groups"][Membership.INVITE] = sync_result.groups.invite
if sync_result.groups.leave:
response["groups"][Membership.LEAVE] = sync_result.groups.leave
return response
@staticmethod
def encode_presence(events: List[UserPresenceState], time_now: int) -> JsonDict:
return {
"events": [
{
"type": "m.presence",
"sender": event.user_id,
"content": format_user_presence_state(
event, time_now, include_user_id=False
),
}
for event in events
]
}
@trace(opname="sync.encode_joined")
async def encode_joined(
self,
rooms: List[JoinedSyncResult],
time_now: int,
token_id: Optional[int],
event_fields: List[str],
event_formatter: Callable[[JsonDict], JsonDict],
) -> JsonDict:
"""
Encode the joined rooms in a sync result
Args:
rooms: list of sync results for rooms this user is joined to
time_now: current time - used as a baseline for age calculations
token_id: ID of the user's auth token - used for namespacing
of transaction IDs
event_fields: List of event fields to include. If empty,
all fields will be returned.
event_formatter: function to convert from federation format
to client format
Returns:
The joined rooms list, in our response format
"""
joined = {}
for room in rooms:
joined[room.room_id] = await self.encode_room(
room,
time_now,
token_id,
joined=True,
only_fields=event_fields,
event_formatter=event_formatter,
)
return joined
@trace(opname="sync.encode_invited")
async def encode_invited(
self,
rooms: List[InvitedSyncResult],
time_now: int,
token_id: Optional[int],
event_formatter: Callable[[JsonDict], JsonDict],
) -> JsonDict:
"""
Encode the invited rooms in a sync result
Args:
rooms: list of sync results for rooms this user is invited to
time_now: current time - used as a baseline for age calculations
token_id: ID of the user's auth token - used for namespacing
of transaction IDs
event_formatter: function to convert from federation format
to client format
Returns:
The invited rooms list, in our response format
"""
invited = {}
for room in rooms:
invite = self._event_serializer.serialize_event(
room.invite,
time_now,
token_id=token_id,
event_format=event_formatter,
include_stripped_room_state=True,
)
unsigned = dict(invite.get("unsigned", {}))
invite["unsigned"] = unsigned
invited_state = list(unsigned.pop("invite_room_state", []))
invited_state.append(invite)
invited[room.room_id] = {"invite_state": {"events": invited_state}}
return invited
@trace(opname="sync.encode_knocked")
async def encode_knocked(
self,
rooms: List[KnockedSyncResult],
time_now: int,
token_id: Optional[int],
event_formatter: Callable[[Dict], Dict],
) -> Dict[str, Dict[str, Any]]:
"""
Encode the rooms we've knocked on in a sync result.
Args:
rooms: list of sync results for rooms this user is knocking on
time_now: current time - used as a baseline for age calculations
token_id: ID of the user's auth token - used for namespacing of transaction IDs
event_formatter: function to convert from federation format to client format
Returns:
The list of rooms the user has knocked on, in our response format.
"""
knocked = {}
for room in rooms:
knock = self._event_serializer.serialize_event(
room.knock,
time_now,
token_id=token_id,
event_format=event_formatter,
include_stripped_room_state=True,
)
# Extract the `unsigned` key from the knock event.
# This is where we (cheekily) store the knock state events
unsigned = knock.setdefault("unsigned", {})
# Duplicate the dictionary in order to avoid modifying the original
unsigned = dict(unsigned)
# Extract the stripped room state from the unsigned dict
# This is for clients to get a little bit of information about
# the room they've knocked on, without revealing any sensitive information
knocked_state = list(unsigned.pop("knock_room_state", []))
# Append the actual knock membership event itself as well. This provides
# the client with:
#
# * A knock state event that they can use for easier internal tracking
# * The rough timestamp of when the knock occurred contained within the event
knocked_state.append(knock)
# Build the `knock_state` dictionary, which will contain the state of the
# room that the client has knocked on
knocked[room.room_id] = {"knock_state": {"events": knocked_state}}
return knocked
@trace(opname="sync.encode_archived")
async def encode_archived(
self,
rooms: List[ArchivedSyncResult],
time_now: int,
token_id: Optional[int],
event_fields: List[str],
event_formatter: Callable[[JsonDict], JsonDict],
) -> JsonDict:
"""
Encode the archived rooms in a sync result
Args:
rooms: list of sync results for rooms this user is joined to
time_now: current time - used as a baseline for age calculations
token_id: ID of the user's auth token - used for namespacing
of transaction IDs
event_fields: List of event fields to include. If empty,
all fields will be returned.
event_formatter: function to convert from federation format to client format
Returns:
The archived rooms list, in our response format
"""
joined = {}
for room in rooms:
joined[room.room_id] = await self.encode_room(
room,
time_now,
token_id,
joined=False,
only_fields=event_fields,
event_formatter=event_formatter,
)
return joined
async def encode_room(
self,
room: Union[JoinedSyncResult, ArchivedSyncResult],
time_now: int,
token_id: Optional[int],
joined: bool,
only_fields: Optional[List[str]],
event_formatter: Callable[[JsonDict], JsonDict],
) -> JsonDict:
"""
Args:
room: sync result for a single room
time_now: current time - used as a baseline for age calculations
token_id: ID of the user's auth token - used for namespacing
of transaction IDs
joined: True if the user is joined to this room - will mean
we handle ephemeral events
only_fields: Optional. The list of event fields to include.
event_formatter: function to convert from federation format
to client format
Returns:
The room, encoded in our response format
"""
def serialize(
events: Iterable[EventBase],
aggregations: Optional[Dict[str, Dict[str, Any]]] = None,
) -> List[JsonDict]:
return self._event_serializer.serialize_events(
events,
time_now=time_now,
bundle_aggregations=aggregations,
token_id=token_id,
event_format=event_formatter,
only_event_fields=only_fields,
)
state_dict = room.state
timeline_events = room.timeline.events
state_events = state_dict.values()
for event in itertools.chain(state_events, timeline_events):
# We've had bug reports that events were coming down under the
# wrong room.
if event.room_id != room.room_id:
logger.warning(
"Event %r is under room %r instead of %r",
event.event_id,
room.room_id,
event.room_id,
)
serialized_state = serialize(state_events)
# Don't bother to bundle aggregations if the timeline is unlimited,
# as clients will have all the necessary information.
# bundle_aggregations=room.timeline.limited,
#
# richvdh 2021-12-15: disable this temporarily as it has too high an
# overhead for initialsyncs. We need to figure out a way that the
# bundling can be done *before* the events are stored in the
# SyncResponseCache so that this part can be synchronous.
#
# Ensure to re-enable the test at tests/rest/client/test_relations.py::RelationsTestCase.test_bundled_aggregations.
# if room.timeline.limited:
# aggregations = await self.store.get_bundled_aggregations(timeline_events)
aggregations = None
serialized_timeline = serialize(timeline_events, aggregations)
account_data = room.account_data
result: JsonDict = {
"timeline": {
"events": serialized_timeline,
"prev_batch": await room.timeline.prev_batch.to_string(self.store),
"limited": room.timeline.limited,
},
"state": {"events": serialized_state},
"account_data": {"events": account_data},
}
if joined:
assert isinstance(room, JoinedSyncResult)
ephemeral_events = room.ephemeral
result["ephemeral"] = {"events": ephemeral_events}
result["unread_notifications"] = room.unread_notifications
result["summary"] = room.summary
result["org.matrix.msc2654.unread_count"] = room.unread_count
return result
def register_servlets(hs: "HomeServer", http_server: HttpServer) -> None:
SyncRestServlet(hs).register(http_server)
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