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Sliding sync: Split up handler into its own module (#17595)

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That file was getting long.

The changes are non functional, and simply split things up into:
- the main class
- the connection store
- the extensions
- the types
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Erik Johnston 2024-08-20 19:30:23 +01:00 committed by GitHub
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commit 92b38c1afd
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5 changed files with 1380 additions and 1267 deletions
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changelog.d/17595.misc Normal file
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Refactor sliding sync class into multiple files.

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synapse/handlers/sliding_sync.py → synapse/handlers/sliding_sync/__init__.py
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synapse/handlers/sliding_sync/extensions.py Normal file
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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>.
#
import logging
from typing import TYPE_CHECKING, Dict, List, Mapping, Optional, Sequence, Set
from typing_extensions import assert_never
from synapse.api.constants import AccountDataTypes
from synapse.handlers.receipts import ReceiptEventSource
from synapse.handlers.sliding_sync.types import (
HaveSentRoomFlag,
MutablePerConnectionState,
PerConnectionState,
)
from synapse.logging.opentracing import trace
from synapse.types import (
DeviceListUpdates,
JsonMapping,
MultiWriterStreamToken,
SlidingSyncStreamToken,
StreamToken,
)
from synapse.types.handlers import OperationType, SlidingSyncConfig, SlidingSyncResult
if TYPE_CHECKING:
from synapse.server import HomeServer
logger = logging.getLogger(__name__)
class SlidingSyncExtensionHandler:
"""Handles the extensions to sliding sync."""
def __init__(self, hs: "HomeServer"):
self.store = hs.get_datastores().main
self.event_sources = hs.get_event_sources()
self.device_handler = hs.get_device_handler()
self.push_rules_handler = hs.get_push_rules_handler()
@trace
async def get_extensions_response(
self,
sync_config: SlidingSyncConfig,
previous_connection_state: "PerConnectionState",
new_connection_state: "MutablePerConnectionState",
actual_lists: Dict[str, SlidingSyncResult.SlidingWindowList],
actual_room_ids: Set[str],
actual_room_response_map: Dict[str, SlidingSyncResult.RoomResult],
to_token: StreamToken,
from_token: Optional[SlidingSyncStreamToken],
) -> SlidingSyncResult.Extensions:
"""Handle extension requests.
Args:
sync_config: Sync configuration
new_connection_state: Snapshot of the current per-connection state
new_per_connection_state: A mutable copy of the per-connection
state, used to record updates to the state during this request.
actual_lists: Sliding window API. A map of list key to list results in the
Sliding Sync response.
actual_room_ids: The actual room IDs in the the Sliding Sync response.
actual_room_response_map: A map of room ID to room results in the the
Sliding Sync response.
to_token: The point in the stream to sync up to.
from_token: The point in the stream to sync from.
"""
if sync_config.extensions is None:
return SlidingSyncResult.Extensions()
to_device_response = None
if sync_config.extensions.to_device is not None:
to_device_response = await self.get_to_device_extension_response(
sync_config=sync_config,
to_device_request=sync_config.extensions.to_device,
to_token=to_token,
)
e2ee_response = None
if sync_config.extensions.e2ee is not None:
e2ee_response = await self.get_e2ee_extension_response(
sync_config=sync_config,
e2ee_request=sync_config.extensions.e2ee,
to_token=to_token,
from_token=from_token,
)
account_data_response = None
if sync_config.extensions.account_data is not None:
account_data_response = await self.get_account_data_extension_response(
sync_config=sync_config,
actual_lists=actual_lists,
actual_room_ids=actual_room_ids,
account_data_request=sync_config.extensions.account_data,
to_token=to_token,
from_token=from_token,
)
receipts_response = None
if sync_config.extensions.receipts is not None:
receipts_response = await self.get_receipts_extension_response(
sync_config=sync_config,
previous_connection_state=previous_connection_state,
new_connection_state=new_connection_state,
actual_lists=actual_lists,
actual_room_ids=actual_room_ids,
actual_room_response_map=actual_room_response_map,
receipts_request=sync_config.extensions.receipts,
to_token=to_token,
from_token=from_token,
)
typing_response = None
if sync_config.extensions.typing is not None:
typing_response = await self.get_typing_extension_response(
sync_config=sync_config,
actual_lists=actual_lists,
actual_room_ids=actual_room_ids,
actual_room_response_map=actual_room_response_map,
typing_request=sync_config.extensions.typing,
to_token=to_token,
from_token=from_token,
)
return SlidingSyncResult.Extensions(
to_device=to_device_response,
e2ee=e2ee_response,
account_data=account_data_response,
receipts=receipts_response,
typing=typing_response,
)
def find_relevant_room_ids_for_extension(
self,
requested_lists: Optional[List[str]],
requested_room_ids: Optional[List[str]],
actual_lists: Dict[str, SlidingSyncResult.SlidingWindowList],
actual_room_ids: Set[str],
) -> Set[str]:
"""
Handle the reserved `lists`/`rooms` keys for extensions. Extensions should only
return results for rooms in the Sliding Sync response. This matches up the
requested rooms/lists with the actual lists/rooms in the Sliding Sync response.
{"lists": []} // Do not process any lists.
{"lists": ["rooms", "dms"]} // Process only a subset of lists.
{"lists": ["*"]} // Process all lists defined in the Sliding Window API. (This is the default.)
{"rooms": []} // Do not process any specific rooms.
{"rooms": ["!a:b", "!c:d"]} // Process only a subset of room subscriptions.
{"rooms": ["*"]} // Process all room subscriptions defined in the Room Subscription API. (This is the default.)
Args:
requested_lists: The `lists` from the extension request.
requested_room_ids: The `rooms` from the extension request.
actual_lists: The actual lists from the Sliding Sync response.
actual_room_ids: The actual room subscriptions from the Sliding Sync request.
"""
# We only want to include account data for rooms that are already in the sliding
# sync response AND that were requested in the account data request.
relevant_room_ids: Set[str] = set()
# See what rooms from the room subscriptions we should get account data for
if requested_room_ids is not None:
for room_id in requested_room_ids:
# A wildcard means we process all rooms from the room subscriptions
if room_id == "*":
relevant_room_ids.update(actual_room_ids)
break
if room_id in actual_room_ids:
relevant_room_ids.add(room_id)
# See what rooms from the sliding window lists we should get account data for
if requested_lists is not None:
for list_key in requested_lists:
# Just some typing because we share the variable name in multiple places
actual_list: Optional[SlidingSyncResult.SlidingWindowList] = None
# A wildcard means we process rooms from all lists
if list_key == "*":
for actual_list in actual_lists.values():
# We only expect a single SYNC operation for any list
assert len(actual_list.ops) == 1
sync_op = actual_list.ops[0]
assert sync_op.op == OperationType.SYNC
relevant_room_ids.update(sync_op.room_ids)
break
actual_list = actual_lists.get(list_key)
if actual_list is not None:
# We only expect a single SYNC operation for any list
assert len(actual_list.ops) == 1
sync_op = actual_list.ops[0]
assert sync_op.op == OperationType.SYNC
relevant_room_ids.update(sync_op.room_ids)
return relevant_room_ids
@trace
async def get_to_device_extension_response(
self,
sync_config: SlidingSyncConfig,
to_device_request: SlidingSyncConfig.Extensions.ToDeviceExtension,
to_token: StreamToken,
) -> Optional[SlidingSyncResult.Extensions.ToDeviceExtension]:
"""Handle to-device extension (MSC3885)
Args:
sync_config: Sync configuration
to_device_request: The to-device extension from the request
to_token: The point in the stream to sync up to.
"""
user_id = sync_config.user.to_string()
device_id = sync_config.requester.device_id
# Skip if the extension is not enabled
if not to_device_request.enabled:
return None
# Check that this request has a valid device ID (not all requests have
# to belong to a device, and so device_id is None)
if device_id is None:
return SlidingSyncResult.Extensions.ToDeviceExtension(
next_batch=f"{to_token.to_device_key}",
events=[],
)
since_stream_id = 0
if to_device_request.since is not None:
# We've already validated this is an int.
since_stream_id = int(to_device_request.since)
if to_token.to_device_key < since_stream_id:
# The since token is ahead of our current token, so we return an
# empty response.
logger.warning(
"Got to-device.since from the future. since token: %r is ahead of our current to_device stream position: %r",
since_stream_id,
to_token.to_device_key,
)
return SlidingSyncResult.Extensions.ToDeviceExtension(
next_batch=to_device_request.since,
events=[],
)
# Delete everything before the given since token, as we know the
# device must have received them.
deleted = await self.store.delete_messages_for_device(
user_id=user_id,
device_id=device_id,
up_to_stream_id=since_stream_id,
)
logger.debug(
"Deleted %d to-device messages up to %d for %s",
deleted,
since_stream_id,
user_id,
)
messages, stream_id = await self.store.get_messages_for_device(
user_id=user_id,
device_id=device_id,
from_stream_id=since_stream_id,
to_stream_id=to_token.to_device_key,
limit=min(to_device_request.limit, 100), # Limit to at most 100 events
)
return SlidingSyncResult.Extensions.ToDeviceExtension(
next_batch=f"{stream_id}",
events=messages,
)
@trace
async def get_e2ee_extension_response(
self,
sync_config: SlidingSyncConfig,
e2ee_request: SlidingSyncConfig.Extensions.E2eeExtension,
to_token: StreamToken,
from_token: Optional[SlidingSyncStreamToken],
) -> Optional[SlidingSyncResult.Extensions.E2eeExtension]:
"""Handle E2EE device extension (MSC3884)
Args:
sync_config: Sync configuration
e2ee_request: The e2ee extension from the request
to_token: The point in the stream to sync up to.
from_token: The point in the stream to sync from.
"""
user_id = sync_config.user.to_string()
device_id = sync_config.requester.device_id
# Skip if the extension is not enabled
if not e2ee_request.enabled:
return None
device_list_updates: Optional[DeviceListUpdates] = None
if from_token is not None:
# TODO: This should take into account the `from_token` and `to_token`
device_list_updates = await self.device_handler.get_user_ids_changed(
user_id=user_id,
from_token=from_token.stream_token,
)
device_one_time_keys_count: Mapping[str, int] = {}
device_unused_fallback_key_types: Sequence[str] = []
if device_id:
# TODO: We should have a way to let clients differentiate between the states of:
# * no change in OTK count since the provided since token
# * the server has zero OTKs left for this device
# Spec issue: https://github.com/matrix-org/matrix-doc/issues/3298
device_one_time_keys_count = await self.store.count_e2e_one_time_keys(
user_id, device_id
)
device_unused_fallback_key_types = (
await self.store.get_e2e_unused_fallback_key_types(user_id, device_id)
)
return SlidingSyncResult.Extensions.E2eeExtension(
device_list_updates=device_list_updates,
device_one_time_keys_count=device_one_time_keys_count,
device_unused_fallback_key_types=device_unused_fallback_key_types,
)
@trace
async def get_account_data_extension_response(
self,
sync_config: SlidingSyncConfig,
actual_lists: Dict[str, SlidingSyncResult.SlidingWindowList],
actual_room_ids: Set[str],
account_data_request: SlidingSyncConfig.Extensions.AccountDataExtension,
to_token: StreamToken,
from_token: Optional[SlidingSyncStreamToken],
) -> Optional[SlidingSyncResult.Extensions.AccountDataExtension]:
"""Handle Account Data extension (MSC3959)
Args:
sync_config: Sync configuration
actual_lists: Sliding window API. A map of list key to list results in the
Sliding Sync response.
actual_room_ids: The actual room IDs in the the Sliding Sync response.
account_data_request: The account_data extension from the request
to_token: The point in the stream to sync up to.
from_token: The point in the stream to sync from.
"""
user_id = sync_config.user.to_string()
# Skip if the extension is not enabled
if not account_data_request.enabled:
return None
global_account_data_map: Mapping[str, JsonMapping] = {}
if from_token is not None:
# TODO: This should take into account the `from_token` and `to_token`
global_account_data_map = (
await self.store.get_updated_global_account_data_for_user(
user_id, from_token.stream_token.account_data_key
)
)
have_push_rules_changed = await self.store.have_push_rules_changed_for_user(
user_id, from_token.stream_token.push_rules_key
)
if have_push_rules_changed:
global_account_data_map = dict(global_account_data_map)
# TODO: This should take into account the `from_token` and `to_token`
global_account_data_map[AccountDataTypes.PUSH_RULES] = (
await self.push_rules_handler.push_rules_for_user(sync_config.user)
)
else:
# TODO: This should take into account the `to_token`
all_global_account_data = await self.store.get_global_account_data_for_user(
user_id
)
global_account_data_map = dict(all_global_account_data)
# TODO: This should take into account the `to_token`
global_account_data_map[AccountDataTypes.PUSH_RULES] = (
await self.push_rules_handler.push_rules_for_user(sync_config.user)
)
# Fetch room account data
account_data_by_room_map: Mapping[str, Mapping[str, JsonMapping]] = {}
relevant_room_ids = self.find_relevant_room_ids_for_extension(
requested_lists=account_data_request.lists,
requested_room_ids=account_data_request.rooms,
actual_lists=actual_lists,
actual_room_ids=actual_room_ids,
)
if len(relevant_room_ids) > 0:
if from_token is not None:
# TODO: This should take into account the `from_token` and `to_token`
account_data_by_room_map = (
await self.store.get_updated_room_account_data_for_user(
user_id, from_token.stream_token.account_data_key
)
)
else:
# TODO: This should take into account the `to_token`
account_data_by_room_map = (
await self.store.get_room_account_data_for_user(user_id)
)
# Filter down to the relevant rooms
account_data_by_room_map = {
room_id: account_data_map
for room_id, account_data_map in account_data_by_room_map.items()
if room_id in relevant_room_ids
}
return SlidingSyncResult.Extensions.AccountDataExtension(
global_account_data_map=global_account_data_map,
account_data_by_room_map=account_data_by_room_map,
)
@trace
async def get_receipts_extension_response(
self,
sync_config: SlidingSyncConfig,
previous_connection_state: "PerConnectionState",
new_connection_state: "MutablePerConnectionState",
actual_lists: Dict[str, SlidingSyncResult.SlidingWindowList],
actual_room_ids: Set[str],
actual_room_response_map: Dict[str, SlidingSyncResult.RoomResult],
receipts_request: SlidingSyncConfig.Extensions.ReceiptsExtension,
to_token: StreamToken,
from_token: Optional[SlidingSyncStreamToken],
) -> Optional[SlidingSyncResult.Extensions.ReceiptsExtension]:
"""Handle Receipts extension (MSC3960)
Args:
sync_config: Sync configuration
previous_connection_state: The current per-connection state
new_connection_state: A mutable copy of the per-connection
state, used to record updates to the state.
actual_lists: Sliding window API. A map of list key to list results in the
Sliding Sync response.
actual_room_ids: The actual room IDs in the the Sliding Sync response.
actual_room_response_map: A map of room ID to room results in the the
Sliding Sync response.
account_data_request: The account_data extension from the request
to_token: The point in the stream to sync up to.
from_token: The point in the stream to sync from.
"""
# Skip if the extension is not enabled
if not receipts_request.enabled:
return None
relevant_room_ids = self.find_relevant_room_ids_for_extension(
requested_lists=receipts_request.lists,
requested_room_ids=receipts_request.rooms,
actual_lists=actual_lists,
actual_room_ids=actual_room_ids,
)
room_id_to_receipt_map: Dict[str, JsonMapping] = {}
if len(relevant_room_ids) > 0:
# We need to handle the different cases depending on if we have sent
# down receipts previously or not, so we split the relevant rooms
# up into different collections based on status.
live_rooms = set()
previously_rooms: Dict[str, MultiWriterStreamToken] = {}
initial_rooms = set()
for room_id in relevant_room_ids:
if not from_token:
initial_rooms.add(room_id)
continue
# If we're sending down the room from scratch again for some reason, we
# should always resend the receipts as well (regardless of if
# we've sent them down before). This is to mimic the behaviour
# of what happens on initial sync, where you get a chunk of
# timeline with all of the corresponding receipts for the events in the timeline.
room_result = actual_room_response_map.get(room_id)
if room_result is not None and room_result.initial:
initial_rooms.add(room_id)
continue
room_status = previous_connection_state.receipts.have_sent_room(room_id)
if room_status.status == HaveSentRoomFlag.LIVE:
live_rooms.add(room_id)
elif room_status.status == HaveSentRoomFlag.PREVIOUSLY:
assert room_status.last_token is not None
previously_rooms[room_id] = room_status.last_token
elif room_status.status == HaveSentRoomFlag.NEVER:
initial_rooms.add(room_id)
else:
assert_never(room_status.status)
# The set of receipts that we fetched. Private receipts need to be
# filtered out before returning.
fetched_receipts = []
# For live rooms we just fetch all receipts in those rooms since the
# `since` token.
if live_rooms:
assert from_token is not None
receipts = await self.store.get_linearized_receipts_for_rooms(
room_ids=live_rooms,
from_key=from_token.stream_token.receipt_key,
to_key=to_token.receipt_key,
)
fetched_receipts.extend(receipts)
# For rooms we've previously sent down, but aren't up to date, we
# need to use the from token from the room status.
if previously_rooms:
for room_id, receipt_token in previously_rooms.items():
# TODO: Limit the number of receipts we're about to send down
# for the room, if its too many we should TODO
previously_receipts = (
await self.store.get_linearized_receipts_for_room(
room_id=room_id,
from_key=receipt_token,
to_key=to_token.receipt_key,
)
)
fetched_receipts.extend(previously_receipts)
# For rooms we haven't previously sent down, we could send all receipts
# from that room but we only want to include receipts for events
# in the timeline to avoid bloating and blowing up the sync response
# as the number of users in the room increases. (this behavior is part of the spec)
initial_rooms_and_event_ids = [
(room_id, event.event_id)
for room_id in initial_rooms
if room_id in actual_room_response_map
for event in actual_room_response_map[room_id].timeline_events
]
if initial_rooms_and_event_ids:
initial_receipts = await self.store.get_linearized_receipts_for_events(
room_and_event_ids=initial_rooms_and_event_ids,
)
fetched_receipts.extend(initial_receipts)
fetched_receipts = ReceiptEventSource.filter_out_private_receipts(
fetched_receipts, sync_config.user.to_string()
)
for receipt in fetched_receipts:
# These fields should exist for every receipt
room_id = receipt["room_id"]
type = receipt["type"]
content = receipt["content"]
room_id_to_receipt_map[room_id] = {"type": type, "content": content}
# Now we update the per-connection state to track which receipts we have
# and haven't sent down.
new_connection_state.receipts.record_sent_rooms(relevant_room_ids)
if from_token:
# Now find the set of rooms that may have receipts that we're not sending
# down. We only need to check rooms that we have previously returned
# receipts for (in `previous_connection_state`) because we only care about
# updating `LIVE` rooms to `PREVIOUSLY`. The `PREVIOUSLY` rooms will just
# stay pointing at their previous position so we don't need to waste time
# checking those and since we default to `NEVER`, rooms that were `NEVER`
# sent before don't need to be recorded as we'll handle them correctly when
# they come into range for the first time.
rooms_no_receipts = [
room_id
for room_id, room_status in previous_connection_state.receipts._statuses.items()
if room_status.status == HaveSentRoomFlag.LIVE
and room_id not in relevant_room_ids
]
changed_rooms = await self.store.get_rooms_with_receipts_between(
rooms_no_receipts,
from_key=from_token.stream_token.receipt_key,
to_key=to_token.receipt_key,
)
new_connection_state.receipts.record_unsent_rooms(
changed_rooms, from_token.stream_token.receipt_key
)
return SlidingSyncResult.Extensions.ReceiptsExtension(
room_id_to_receipt_map=room_id_to_receipt_map,
)
async def get_typing_extension_response(
self,
sync_config: SlidingSyncConfig,
actual_lists: Dict[str, SlidingSyncResult.SlidingWindowList],
actual_room_ids: Set[str],
actual_room_response_map: Dict[str, SlidingSyncResult.RoomResult],
typing_request: SlidingSyncConfig.Extensions.TypingExtension,
to_token: StreamToken,
from_token: Optional[SlidingSyncStreamToken],
) -> Optional[SlidingSyncResult.Extensions.TypingExtension]:
"""Handle Typing Notification extension (MSC3961)
Args:
sync_config: Sync configuration
actual_lists: Sliding window API. A map of list key to list results in the
Sliding Sync response.
actual_room_ids: The actual room IDs in the the Sliding Sync response.
actual_room_response_map: A map of room ID to room results in the the
Sliding Sync response.
account_data_request: The account_data extension from the request
to_token: The point in the stream to sync up to.
from_token: The point in the stream to sync from.
"""
# Skip if the extension is not enabled
if not typing_request.enabled:
return None
relevant_room_ids = self.find_relevant_room_ids_for_extension(
requested_lists=typing_request.lists,
requested_room_ids=typing_request.rooms,
actual_lists=actual_lists,
actual_room_ids=actual_room_ids,
)
room_id_to_typing_map: Dict[str, JsonMapping] = {}
if len(relevant_room_ids) > 0:
# Note: We don't need to take connection tracking into account for typing
# notifications because they'll get anything still relevant and hasn't timed
# out when the room comes into range. We consider the gap where the room
# fell out of range, as long enough for any typing notifications to have
# timed out (it's not worth the 30 seconds of data we may have missed).
typing_source = self.event_sources.sources.typing
typing_notifications, _ = await typing_source.get_new_events(
user=sync_config.user,
from_key=(from_token.stream_token.typing_key if from_token else 0),
to_key=to_token.typing_key,
# This is a dummy value and isn't used in the function
limit=0,
room_ids=relevant_room_ids,
is_guest=False,
)
for typing_notification in typing_notifications:
# These fields should exist for every typing notification
room_id = typing_notification["room_id"]
type = typing_notification["type"]
content = typing_notification["content"]
room_id_to_typing_map[room_id] = {"type": type, "content": content}
return SlidingSyncResult.Extensions.TypingExtension(
room_id_to_typing_map=room_id_to_typing_map,
)

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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>.
#
import logging
from typing import TYPE_CHECKING, Dict, Optional, Tuple
import attr
from synapse.api.errors import SlidingSyncUnknownPosition
from synapse.handlers.sliding_sync.types import (
MutablePerConnectionState,
PerConnectionState,
)
from synapse.logging.opentracing import trace
from synapse.types import SlidingSyncStreamToken
from synapse.types.handlers import SlidingSyncConfig
if TYPE_CHECKING:
pass
logger = logging.getLogger(__name__)
@attr.s(auto_attribs=True)
class SlidingSyncConnectionStore:
"""In-memory store of per-connection state, including what rooms we have
previously sent down a sliding sync connection.
Note: This is NOT safe to run in a worker setup because connection positions will
point to different sets of rooms on different workers. e.g. for the same connection,
a connection position of 5 might have totally different states on worker A and
worker B.
One complication that we need to deal with here is needing to handle requests being
resent, i.e. if we sent down a room in a response that the client received, we must
consider the room *not* sent when we get the request again.
This is handled by using an integer "token", which is returned to the client
as part of the sync token. For each connection we store a mapping from
tokens to the room states, and create a new entry when we send down new
rooms.
Note that for any given sliding sync connection we will only store a maximum
of two different tokens: the previous token from the request and a new token
sent in the response. When we receive a request with a given token, we then
clear out all other entries with a different token.
Attributes:
_connections: Mapping from `(user_id, conn_id)` to mapping of `token`
to mapping of room ID to `HaveSentRoom`.
"""
# `(user_id, conn_id)` -> `connection_position` -> `PerConnectionState`
_connections: Dict[Tuple[str, str], Dict[int, PerConnectionState]] = attr.Factory(
dict
)
async def is_valid_token(
self, sync_config: SlidingSyncConfig, connection_token: int
) -> bool:
"""Return whether the connection token is valid/recognized"""
if connection_token == 0:
return True
conn_key = self._get_connection_key(sync_config)
return connection_token in self._connections.get(conn_key, {})
async def get_per_connection_state(
self,
sync_config: SlidingSyncConfig,
from_token: Optional[SlidingSyncStreamToken],
) -> PerConnectionState:
"""Fetch the per-connection state for the token.
Raises:
SlidingSyncUnknownPosition if the connection_token is unknown
"""
if from_token is None:
return PerConnectionState()
connection_position = from_token.connection_position
if connection_position == 0:
# Initial sync (request without a `from_token`) starts at `0` so
# there is no existing per-connection state
return PerConnectionState()
conn_key = self._get_connection_key(sync_config)
sync_statuses = self._connections.get(conn_key, {})
connection_state = sync_statuses.get(connection_position)
if connection_state is None:
raise SlidingSyncUnknownPosition()
return connection_state
@trace
async def record_new_state(
self,
sync_config: SlidingSyncConfig,
from_token: Optional[SlidingSyncStreamToken],
new_connection_state: MutablePerConnectionState,
) -> int:
"""Record updated per-connection state, returning the connection
position associated with the new state.
If there are no changes to the state this may return the same token as
the existing per-connection state.
"""
prev_connection_token = 0
if from_token is not None:
prev_connection_token = from_token.connection_position
if not new_connection_state.has_updates():
return prev_connection_token
conn_key = self._get_connection_key(sync_config)
sync_statuses = self._connections.setdefault(conn_key, {})
# Generate a new token, removing any existing entries in that token
# (which can happen if requests get resent).
new_store_token = prev_connection_token + 1
sync_statuses.pop(new_store_token, None)
# We copy the `MutablePerConnectionState` so that the inner `ChainMap`s
# don't grow forever.
sync_statuses[new_store_token] = new_connection_state.copy()
return new_store_token
@trace
async def mark_token_seen(
self,
sync_config: SlidingSyncConfig,
from_token: Optional[SlidingSyncStreamToken],
) -> None:
"""We have received a request with the given token, so we can clear out
any other tokens associated with the connection.
If there is no from token then we have started afresh, and so we delete
all tokens associated with the device.
"""
# Clear out any tokens for the connection that doesn't match the one
# from the request.
conn_key = self._get_connection_key(sync_config)
sync_statuses = self._connections.pop(conn_key, {})
if from_token is None:
return
sync_statuses = {
connection_token: room_statuses
for connection_token, room_statuses in sync_statuses.items()
if connection_token == from_token.connection_position
}
if sync_statuses:
self._connections[conn_key] = sync_statuses
@staticmethod
def _get_connection_key(sync_config: SlidingSyncConfig) -> Tuple[str, str]:
"""Return a unique identifier for this connection.
The first part is simply the user ID.
The second part is generally a combination of device ID and conn_id.
However, both these two are optional (e.g. puppet access tokens don't
have device IDs), so this handles those edge cases.
We use this over the raw `conn_id` to avoid clashes between different
clients that use the same `conn_id`. Imagine a user uses a web client
that uses `conn_id: main_sync_loop` and an Android client that also has
a `conn_id: main_sync_loop`.
"""
user_id = sync_config.user.to_string()
# Only one sliding sync connection is allowed per given conn_id (empty
# or not).
conn_id = sync_config.conn_id or ""
if sync_config.requester.device_id:
return (user_id, f"D/{sync_config.requester.device_id}/{conn_id}")
if sync_config.requester.access_token_id:
# If we don't have a device, then the access token ID should be a
# stable ID.
return (user_id, f"A/{sync_config.requester.access_token_id}/{conn_id}")
# If we have neither then its likely an AS or some weird token. Either
# way we can just fail here.
raise Exception("Cannot use sliding sync with access token type")

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#
# This file is licensed under the Affero General Public License (AGPL) version 3.
#
# Copyright (C) 2024 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>.
#
import logging
import typing
from collections import ChainMap
from enum import Enum
from typing import (
TYPE_CHECKING,
Callable,
Dict,
Final,
Generic,
Mapping,
MutableMapping,
Optional,
Set,
TypeVar,
cast,
)
import attr
from synapse.api.constants import EventTypes
from synapse.types import MultiWriterStreamToken, RoomStreamToken, StrCollection, UserID
from synapse.types.handlers import SlidingSyncConfig
if TYPE_CHECKING:
pass
logger = logging.getLogger(__name__)
class StateValues:
"""
Understood values of the (type, state_key) tuple in `required_state`.
"""
# Include all state events of the given type
WILDCARD: Final = "*"
# Lazy-load room membership events (include room membership events for any event
# `sender` in the timeline). We only give special meaning to this value when it's a
# `state_key`.
LAZY: Final = "$LAZY"
# Subsitute with the requester's user ID. Typically used by clients to get
# the user's membership.
ME: Final = "$ME"
# We can't freeze this class because we want to update it in place with the
# de-duplicated data.
@attr.s(slots=True, auto_attribs=True)
class RoomSyncConfig:
"""
Holds the config for what data we should fetch for a room in the sync response.
Attributes:
timeline_limit: The maximum number of events to return in the timeline.
required_state_map: Map from state event type to state_keys requested for the
room. The values are close to `StateKey` but actually use a syntax where you
can provide `*` wildcard and `$LAZY` for lazy-loading room members.
"""
timeline_limit: int
required_state_map: Dict[str, Set[str]]
@classmethod
def from_room_config(
cls,
room_params: SlidingSyncConfig.CommonRoomParameters,
) -> "RoomSyncConfig":
"""
Create a `RoomSyncConfig` from a `SlidingSyncList`/`RoomSubscription` config.
Args:
room_params: `SlidingSyncConfig.SlidingSyncList` or `SlidingSyncConfig.RoomSubscription`
"""
required_state_map: Dict[str, Set[str]] = {}
for (
state_type,
state_key,
) in room_params.required_state:
# If we already have a wildcard for this specific `state_key`, we don't need
# to add it since the wildcard already covers it.
if state_key in required_state_map.get(StateValues.WILDCARD, set()):
continue
# If we already have a wildcard `state_key` for this `state_type`, we don't need
# to add anything else
if StateValues.WILDCARD in required_state_map.get(state_type, set()):
continue
# If we're getting wildcards for the `state_type` and `state_key`, that's
# all that matters so get rid of any other entries
if state_type == StateValues.WILDCARD and state_key == StateValues.WILDCARD:
required_state_map = {StateValues.WILDCARD: {StateValues.WILDCARD}}
# We can break, since we don't need to add anything else
break
# If we're getting a wildcard for the `state_type`, get rid of any other
# entries with the same `state_key`, since the wildcard will cover it already.
elif state_type == StateValues.WILDCARD:
# Get rid of any entries that match the `state_key`
#
# Make a copy so we don't run into an error: `dictionary changed size
# during iteration`, when we remove items
for (
existing_state_type,
existing_state_key_set,
) in list(required_state_map.items()):
# Make a copy so we don't run into an error: `Set changed size during
# iteration`, when we filter out and remove items
for existing_state_key in existing_state_key_set.copy():
if existing_state_key == state_key:
existing_state_key_set.remove(state_key)
# If we've the left the `set()` empty, remove it from the map
if existing_state_key_set == set():
required_state_map.pop(existing_state_type, None)
# If we're getting a wildcard `state_key`, get rid of any other state_keys
# for this `state_type` since the wildcard will cover it already.
if state_key == StateValues.WILDCARD:
required_state_map[state_type] = {state_key}
# Otherwise, just add it to the set
else:
if required_state_map.get(state_type) is None:
required_state_map[state_type] = {state_key}
else:
required_state_map[state_type].add(state_key)
return cls(
timeline_limit=room_params.timeline_limit,
required_state_map=required_state_map,
)
def deep_copy(self) -> "RoomSyncConfig":
required_state_map: Dict[str, Set[str]] = {
state_type: state_key_set.copy()
for state_type, state_key_set in self.required_state_map.items()
}
return RoomSyncConfig(
timeline_limit=self.timeline_limit,
required_state_map=required_state_map,
)
def combine_room_sync_config(
self, other_room_sync_config: "RoomSyncConfig"
) -> None:
"""
Combine this `RoomSyncConfig` with another `RoomSyncConfig` and take the
superset union of the two.
"""
# Take the highest timeline limit
if self.timeline_limit < other_room_sync_config.timeline_limit:
self.timeline_limit = other_room_sync_config.timeline_limit
# Union the required state
for (
state_type,
state_key_set,
) in other_room_sync_config.required_state_map.items():
# If we already have a wildcard for everything, we don't need to add
# anything else
if StateValues.WILDCARD in self.required_state_map.get(
StateValues.WILDCARD, set()
):
break
# If we already have a wildcard `state_key` for this `state_type`, we don't need
# to add anything else
if StateValues.WILDCARD in self.required_state_map.get(state_type, set()):
continue
# If we're getting wildcards for the `state_type` and `state_key`, that's
# all that matters so get rid of any other entries
if (
state_type == StateValues.WILDCARD
and StateValues.WILDCARD in state_key_set
):
self.required_state_map = {state_type: {StateValues.WILDCARD}}
# We can break, since we don't need to add anything else
break
for state_key in state_key_set:
# If we already have a wildcard for this specific `state_key`, we don't need
# to add it since the wildcard already covers it.
if state_key in self.required_state_map.get(
StateValues.WILDCARD, set()
):
continue
# If we're getting a wildcard for the `state_type`, get rid of any other
# entries with the same `state_key`, since the wildcard will cover it already.
if state_type == StateValues.WILDCARD:
# Get rid of any entries that match the `state_key`
#
# Make a copy so we don't run into an error: `dictionary changed size
# during iteration`, when we remove items
for existing_state_type, existing_state_key_set in list(
self.required_state_map.items()
):
# Make a copy so we don't run into an error: `Set changed size during
# iteration`, when we filter out and remove items
for existing_state_key in existing_state_key_set.copy():
if existing_state_key == state_key:
existing_state_key_set.remove(state_key)
# If we've the left the `set()` empty, remove it from the map
if existing_state_key_set == set():
self.required_state_map.pop(existing_state_type, None)
# If we're getting a wildcard `state_key`, get rid of any other state_keys
# for this `state_type` since the wildcard will cover it already.
if state_key == StateValues.WILDCARD:
self.required_state_map[state_type] = {state_key}
break
# Otherwise, just add it to the set
else:
if self.required_state_map.get(state_type) is None:
self.required_state_map[state_type] = {state_key}
else:
self.required_state_map[state_type].add(state_key)
def must_await_full_state(
self,
is_mine_id: Callable[[str], bool],
) -> bool:
"""
Check if we have a we're only requesting `required_state` which is completely
satisfied even with partial state, then we don't need to `await_full_state` before
we can return it.
Also see `StateFilter.must_await_full_state(...)` for comparison
Partially-stated rooms should have all state events except for remote membership
events so if we require a remote membership event anywhere, then we need to
return `True` (requires full state).
Args:
is_mine_id: a callable which confirms if a given state_key matches a mxid
of a local user
"""
wildcard_state_keys = self.required_state_map.get(StateValues.WILDCARD)
# Requesting *all* state in the room so we have to wait
if (
wildcard_state_keys is not None
and StateValues.WILDCARD in wildcard_state_keys
):
return True
# If the wildcards don't refer to remote user IDs, then we don't need to wait
# for full state.
if wildcard_state_keys is not None:
for possible_user_id in wildcard_state_keys:
if not possible_user_id[0].startswith(UserID.SIGIL):
# Not a user ID
continue
localpart_hostname = possible_user_id.split(":", 1)
if len(localpart_hostname) < 2:
# Not a user ID
continue
if not is_mine_id(possible_user_id):
return True
membership_state_keys = self.required_state_map.get(EventTypes.Member)
# We aren't requesting any membership events at all so the partial state will
# cover us.
if membership_state_keys is None:
return False
# If we're requesting entirely local users, the partial state will cover us.
for user_id in membership_state_keys:
if user_id == StateValues.ME:
continue
# We're lazy-loading membership so we can just return the state we have.
# Lazy-loading means we include membership for any event `sender` in the
# timeline but since we had to auth those timeline events, we will have the
# membership state for them (including from remote senders).
elif user_id == StateValues.LAZY:
continue
elif user_id == StateValues.WILDCARD:
return False
elif not is_mine_id(user_id):
return True
# Local users only so the partial state will cover us.
return False
class HaveSentRoomFlag(Enum):
"""Flag for whether we have sent the room down a sliding sync connection.
The valid state changes here are:
NEVER -> LIVE
LIVE -> PREVIOUSLY
PREVIOUSLY -> LIVE
"""
# The room has never been sent down (or we have forgotten we have sent it
# down).
NEVER = "never"
# We have previously sent the room down, but there are updates that we
# haven't sent down.
PREVIOUSLY = "previously"
# We have sent the room down and the client has received all updates.
LIVE = "live"
T = TypeVar("T")
@attr.s(auto_attribs=True, slots=True, frozen=True)
class HaveSentRoom(Generic[T]):
"""Whether we have sent the room data down a sliding sync connection.
We are generic over the type of token used, e.g. `RoomStreamToken` or
`MultiWriterStreamToken`.
Attributes:
status: Flag of if we have or haven't sent down the room
last_token: If the flag is `PREVIOUSLY` then this is non-null and
contains the last stream token of the last updates we sent down
the room, i.e. we still need to send everything since then to the
client.
"""
status: HaveSentRoomFlag
last_token: Optional[T]
@staticmethod
def live() -> "HaveSentRoom[T]":
return HaveSentRoom(HaveSentRoomFlag.LIVE, None)
@staticmethod
def previously(last_token: T) -> "HaveSentRoom[T]":
"""Constructor for `PREVIOUSLY` flag."""
return HaveSentRoom(HaveSentRoomFlag.PREVIOUSLY, last_token)
@staticmethod
def never() -> "HaveSentRoom[T]":
return HaveSentRoom(HaveSentRoomFlag.NEVER, None)
@attr.s(auto_attribs=True, slots=True, frozen=True)
class RoomStatusMap(Generic[T]):
"""For a given stream, e.g. events, records what we have or have not sent
down for that stream in a given room."""
# `room_id` -> `HaveSentRoom`
_statuses: Mapping[str, HaveSentRoom[T]] = attr.Factory(dict)
def have_sent_room(self, room_id: str) -> HaveSentRoom[T]:
"""Return whether we have previously sent the room down"""
return self._statuses.get(room_id, HaveSentRoom.never())
def get_mutable(self) -> "MutableRoomStatusMap[T]":
"""Get a mutable copy of this state."""
return MutableRoomStatusMap(
statuses=self._statuses,
)
def copy(self) -> "RoomStatusMap[T]":
"""Make a copy of the class. Useful for converting from a mutable to
immutable version."""
return RoomStatusMap(statuses=dict(self._statuses))
class MutableRoomStatusMap(RoomStatusMap[T]):
"""A mutable version of `RoomStatusMap`"""
# We use a ChainMap here so that we can easily track what has been updated
# and what hasn't. Note that when we persist the per connection state this
# will get flattened to a normal dict (via calling `.copy()`)
_statuses: typing.ChainMap[str, HaveSentRoom[T]]
def __init__(
self,
statuses: Mapping[str, HaveSentRoom[T]],
) -> None:
# ChainMap requires a mutable mapping, but we're not actually going to
# mutate it.
statuses = cast(MutableMapping, statuses)
super().__init__(
statuses=ChainMap({}, statuses),
)
def get_updates(self) -> Mapping[str, HaveSentRoom[T]]:
"""Return only the changes that were made"""
return self._statuses.maps[0]
def record_sent_rooms(self, room_ids: StrCollection) -> None:
"""Record that we have sent these rooms in the response"""
for room_id in room_ids:
current_status = self._statuses.get(room_id, HaveSentRoom.never())
if current_status.status == HaveSentRoomFlag.LIVE:
continue
self._statuses[room_id] = HaveSentRoom.live()
def record_unsent_rooms(self, room_ids: StrCollection, from_token: T) -> None:
"""Record that we have not sent these rooms in the response, but there
have been updates.
"""
# Whether we add/update the entries for unsent rooms depends on the
# existing entry:
# - LIVE: We have previously sent down everything up to
# `last_room_token, so we update the entry to be `PREVIOUSLY` with
# `last_room_token`.
# - PREVIOUSLY: We have previously sent down everything up to *a*
# given token, so we don't need to update the entry.
# - NEVER: We have never previously sent down the room, and we haven't
# sent anything down this time either so we leave it as NEVER.
for room_id in room_ids:
current_status = self._statuses.get(room_id, HaveSentRoom.never())
if current_status.status != HaveSentRoomFlag.LIVE:
continue
self._statuses[room_id] = HaveSentRoom.previously(from_token)
@attr.s(auto_attribs=True)
class PerConnectionState:
"""The per-connection state. A snapshot of what we've sent down the
connection before.
Currently, we track whether we've sent down various aspects of a given room
before.
We use the `rooms` field to store the position in the events stream for each
room that we've previously sent to the client before. On the next request
that includes the room, we can then send only what's changed since that
recorded position.
Same goes for the `receipts` field so we only need to send the new receipts
since the last time you made a sync request.
Attributes:
rooms: The status of each room for the events stream.
receipts: The status of each room for the receipts stream.
room_configs: Map from room_id to the `RoomSyncConfig` of all
rooms that we have previously sent down.
"""
rooms: RoomStatusMap[RoomStreamToken] = attr.Factory(RoomStatusMap)
receipts: RoomStatusMap[MultiWriterStreamToken] = attr.Factory(RoomStatusMap)
room_configs: Mapping[str, RoomSyncConfig] = attr.Factory(dict)
def get_mutable(self) -> "MutablePerConnectionState":
"""Get a mutable copy of this state."""
room_configs = cast(MutableMapping[str, RoomSyncConfig], self.room_configs)
return MutablePerConnectionState(
rooms=self.rooms.get_mutable(),
receipts=self.receipts.get_mutable(),
room_configs=ChainMap({}, room_configs),
)
def copy(self) -> "PerConnectionState":
return PerConnectionState(
rooms=self.rooms.copy(),
receipts=self.receipts.copy(),
room_configs=dict(self.room_configs),
)
@attr.s(auto_attribs=True)
class MutablePerConnectionState(PerConnectionState):
"""A mutable version of `PerConnectionState`"""
rooms: MutableRoomStatusMap[RoomStreamToken]
receipts: MutableRoomStatusMap[MultiWriterStreamToken]
room_configs: typing.ChainMap[str, RoomSyncConfig]
def has_updates(self) -> bool:
return (
bool(self.rooms.get_updates())
or bool(self.receipts.get_updates())
or bool(self.get_room_config_updates())
)
def get_room_config_updates(self) -> Mapping[str, RoomSyncConfig]:
"""Get updates to the room sync config"""
return self.room_configs.maps[0]