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Underscore-prefix private fields in FederationEventHandler (#10746)

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Richard van der Hoff 2021-09-07 11:15:51 +01:00 committed by GitHub
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2 changed files with 74 additions and 71 deletions
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changelog.d/10746.misc Normal file
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@ -0,0 +1 @@
Clean up some of the federation event authentication code for clarity.

144
synapse/handlers/federation_event.py
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@ -124,28 +124,28 @@ class FederationEventHandler:
"""
def __init__(self, hs: "HomeServer"):
self.store = hs.get_datastore()
self.storage = hs.get_storage()
self.state_store = self.storage.state
self._store = hs.get_datastore()
self._storage = hs.get_storage()
self._state_store = self._storage.state
self.state_handler = hs.get_state_handler()
self.event_creation_handler = hs.get_event_creation_handler()
self._state_handler = hs.get_state_handler()
self._event_creation_handler = hs.get_event_creation_handler()
self._event_auth_handler = hs.get_event_auth_handler()
self._message_handler = hs.get_message_handler()
self.action_generator = hs.get_action_generator()
self._action_generator = hs.get_action_generator()
self._state_resolution_handler = hs.get_state_resolution_handler()
# avoid a circular dependency by deferring execution here
self._get_room_member_handler = hs.get_room_member_handler
self.federation_client = hs.get_federation_client()
self.third_party_event_rules = hs.get_third_party_event_rules()
self._federation_client = hs.get_federation_client()
self._third_party_event_rules = hs.get_third_party_event_rules()
self._notifier = hs.get_notifier()
self.is_mine_id = hs.is_mine_id
self._is_mine_id = hs.is_mine_id
self._server_name = hs.hostname
self._instance_name = hs.get_instance_name()
self.config = hs.config
self._config = hs.config
self._ephemeral_messages_enabled = hs.config.server.enable_ephemeral_messages
self._send_events = ReplicationFederationSendEventsRestServlet.make_client(hs)
@ -177,7 +177,7 @@ class FederationEventHandler:
event_id = pdu.event_id
# We reprocess pdus when we have seen them only as outliers
existing = await self.store.get_event(
existing = await self._store.get_event(
event_id, allow_none=True, allow_rejected=True
)
@ -240,7 +240,7 @@ class FederationEventHandler:
# - Fetching state if we have a hole in the graph
if not pdu.internal_metadata.is_outlier():
prevs = set(pdu.prev_event_ids())
seen = await self.store.have_events_in_timeline(prevs)
seen = await self._store.have_events_in_timeline(prevs)
missing_prevs = prevs - seen
if missing_prevs:
@ -274,7 +274,7 @@ class FederationEventHandler:
# Update the set of things we've seen after trying to
# fetch the missing stuff
seen = await self.store.have_events_in_timeline(prevs)
seen = await self._store.have_events_in_timeline(prevs)
missing_prevs = prevs - seen
if not missing_prevs:
@ -363,7 +363,7 @@ class FederationEventHandler:
# the room, so we send it on their behalf.
event.internal_metadata.send_on_behalf_of = origin
context = await self.state_handler.compute_event_context(event)
context = await self._state_handler.compute_event_context(event)
context = await self._check_event_auth(origin, event, context)
if context.rejected:
raise SynapseError(
@ -377,7 +377,7 @@ class FederationEventHandler:
# for knock events, we run the third-party event rules. It's not entirely clear
# why we don't do this for other sorts of membership events.
if event.membership == Membership.KNOCK:
event_allowed, _ = await self.third_party_event_rules.check_event_allowed(
event_allowed, _ = await self._third_party_event_rules.check_event_allowed(
event, context
)
if not event_allowed:
@ -406,7 +406,7 @@ class FederationEventHandler:
prev_member_event_id = prev_state_ids.get((EventTypes.Member, user_id), None)
prev_member_event = None
if prev_member_event_id:
prev_member_event = await self.store.get_event(prev_member_event_id)
prev_member_event = await self._store.get_event(prev_member_event_id)
# Check if the member should be allowed access via membership in a space.
await self._event_auth_handler.check_restricted_join_rules(
@ -439,7 +439,7 @@ class FederationEventHandler:
if dest == self._server_name:
raise SynapseError(400, "Can't backfill from self.")
events = await self.federation_client.backfill(
events = await self._federation_client.backfill(
dest, room_id, limit=limit, extremities=extremities
)
@ -471,12 +471,12 @@ class FederationEventHandler:
room_id = pdu.room_id
event_id = pdu.event_id
seen = await self.store.have_events_in_timeline(prevs)
seen = await self._store.have_events_in_timeline(prevs)
if not prevs - seen:
return
latest_list = await self.store.get_latest_event_ids_in_room(room_id)
latest_list = await self._store.get_latest_event_ids_in_room(room_id)
# We add the prev events that we have seen to the latest
# list to ensure the remote server doesn't give them to us
@ -538,7 +538,7 @@ class FederationEventHandler:
# All that said: Let's try increasing the timeout to 60s and see what happens.
try:
missing_events = await self.federation_client.get_missing_events(
missing_events = await self._federation_client.get_missing_events(
origin,
room_id,
earliest_events_ids=list(latest),
@ -611,7 +611,7 @@ class FederationEventHandler:
event_id = event.event_id
existing = await self.store.get_event(
existing = await self._store.get_event(
event_id, allow_none=True, allow_rejected=True
)
if existing:
@ -676,7 +676,7 @@ class FederationEventHandler:
event_id = event.event_id
prevs = set(event.prev_event_ids())
seen = await self.store.have_events_in_timeline(prevs)
seen = await self._store.have_events_in_timeline(prevs)
missing_prevs = prevs - seen
if not missing_prevs:
@ -693,7 +693,7 @@ class FederationEventHandler:
event_map = {event_id: event}
try:
# Get the state of the events we know about
ours = await self.state_store.get_state_groups_ids(room_id, seen)
ours = await self._state_store.get_state_groups_ids(room_id, seen)
# state_maps is a list of mappings from (type, state_key) to event_id
state_maps: List[StateMap[str]] = list(ours.values())
@ -722,13 +722,13 @@ class FederationEventHandler:
for x in remote_state:
event_map[x.event_id] = x
room_version = await self.store.get_room_version_id(room_id)
room_version = await self._store.get_room_version_id(room_id)
state_map = await self._state_resolution_handler.resolve_events_with_store(
room_id,
room_version,
state_maps,
event_map,
state_res_store=StateResolutionStore(self.store),
state_res_store=StateResolutionStore(self._store),
)
# We need to give _process_received_pdu the actual state events
@ -736,7 +736,7 @@ class FederationEventHandler:
# First though we need to fetch all the events that are in
# state_map, so we can build up the state below.
evs = await self.store.get_events(
evs = await self._store.get_events(
list(state_map.values()),
get_prev_content=False,
redact_behaviour=EventRedactBehaviour.AS_IS,
@ -776,7 +776,7 @@ class FederationEventHandler:
(
state_event_ids,
auth_event_ids,
) = await self.federation_client.get_room_state_ids(
) = await self._federation_client.get_room_state_ids(
destination, room_id, event_id=event_id
)
@ -790,7 +790,7 @@ class FederationEventHandler:
desired_events = set(state_event_ids)
desired_events.add(event_id)
logger.debug("Fetching %i events from cache/store", len(desired_events))
fetched_events = await self.store.get_events(
fetched_events = await self._store.get_events(
desired_events, allow_rejected=True
)
@ -811,7 +811,7 @@ class FederationEventHandler:
missing_auth_events = set(auth_event_ids) - fetched_events.keys()
missing_auth_events.difference_update(
await self.store.have_seen_events(room_id, missing_auth_events)
await self._store.have_seen_events(room_id, missing_auth_events)
)
logger.debug("We are also missing %i auth events", len(missing_auth_events))
@ -824,7 +824,7 @@ class FederationEventHandler:
# we need to make sure we re-load from the database to get the rejected
# state correct.
fetched_events.update(
await self.store.get_events(missing_desired_events, allow_rejected=True)
await self._store.get_events(missing_desired_events, allow_rejected=True)
)
# check for events which were in the wrong room.
@ -903,7 +903,7 @@ class FederationEventHandler:
logger.debug("Processing event: %s", event)
try:
context = await self.state_handler.compute_event_context(
context = await self._state_handler.compute_event_context(
event, old_state=state
)
await self._auth_and_persist_event(
@ -921,7 +921,7 @@ class FederationEventHandler:
device_id = event.content.get("device_id")
sender_key = event.content.get("sender_key")
cached_devices = await self.store.get_cached_devices_for_user(event.sender)
cached_devices = await self._store.get_cached_devices_for_user(event.sender)
resync = False # Whether we should resync device lists.
@ -997,10 +997,10 @@ class FederationEventHandler:
"""
try:
await self.store.mark_remote_user_device_cache_as_stale(sender)
await self._store.mark_remote_user_device_cache_as_stale(sender)
# Immediately attempt a resync in the background
if self.config.worker_app:
if self._config.worker_app:
await self._user_device_resync(user_id=sender)
else:
await self._device_list_updater.user_device_resync(sender)
@ -1026,12 +1026,12 @@ class FederationEventHandler:
# Skip processing a marker event if the room version doesn't
# support it or the event is not from the room creator.
room_version = await self.store.get_room_version(marker_event.room_id)
create_event = await self.store.get_create_event_for_room(marker_event.room_id)
room_version = await self._store.get_room_version(marker_event.room_id)
create_event = await self._store.get_create_event_for_room(marker_event.room_id)
room_creator = create_event.content.get(EventContentFields.ROOM_CREATOR)
if (
not room_version.msc2716_historical
or not self.config.experimental.msc2716_enabled
or not self._config.experimental.msc2716_enabled
or marker_event.sender != room_creator
):
return
@ -1056,7 +1056,7 @@ class FederationEventHandler:
[insertion_event_id],
)
insertion_event = await self.store.get_event(
insertion_event = await self._store.get_event(
insertion_event_id, allow_none=True
)
if insertion_event is None:
@ -1074,7 +1074,7 @@ class FederationEventHandler:
marker_event,
)
await self.store.insert_insertion_extremity(
await self._store.insert_insertion_extremity(
insertion_event_id, marker_event.room_id
)
@ -1096,14 +1096,14 @@ class FederationEventHandler:
Logs a warning if we can't find the given event.
"""
room_version = await self.store.get_room_version(room_id)
room_version = await self._store.get_room_version(room_id)
event_map: Dict[str, EventBase] = {}
async def get_event(event_id: str):
with nested_logging_context(event_id):
try:
event = await self.federation_client.get_pdu(
event = await self._federation_client.get_pdu(
[destination],
event_id,
room_version,
@ -1139,7 +1139,7 @@ class FederationEventHandler:
for aid in event.auth_event_ids()
if aid not in event_map
]
persisted_events = await self.store.get_events(
persisted_events = await self._store.get_events(
auth_events,
allow_rejected=True,
)
@ -1183,7 +1183,7 @@ class FederationEventHandler:
async def prep(ev_info: _NewEventInfo):
event = ev_info.event
with nested_logging_context(suffix=event.event_id):
res = await self.state_handler.compute_event_context(event)
res = await self._state_handler.compute_event_context(event)
res = await self._check_event_auth(
origin,
event,
@ -1286,7 +1286,7 @@ class FederationEventHandler:
Returns:
The updated context object.
"""
room_version = await self.store.get_room_version_id(event.room_id)
room_version = await self._store.get_room_version_id(event.room_id)
room_version_obj = KNOWN_ROOM_VERSIONS[room_version]
if claimed_auth_event_map:
@ -1299,7 +1299,7 @@ class FederationEventHandler:
auth_events_ids = self._event_auth_handler.compute_auth_events(
event, prev_state_ids, for_verification=True
)
auth_events_x = await self.store.get_events(auth_events_ids)
auth_events_x = await self._store.get_events(auth_events_ids)
auth_events = {(e.type, e.state_key): e for e in auth_events_x.values()}
try:
@ -1334,7 +1334,7 @@ class FederationEventHandler:
# If we are going to send this event over federation we precaclculate
# the joined hosts.
if event.internal_metadata.get_send_on_behalf_of():
await self.event_creation_handler.cache_joined_hosts_for_event(
await self._event_creation_handler.cache_joined_hosts_for_event(
event, context
)
@ -1348,7 +1348,7 @@ class FederationEventHandler:
if guest_access == GuestAccess.CAN_JOIN:
return
current_state_map = await self.state_handler.get_current_state(event.room_id)
current_state_map = await self._state_handler.get_current_state(event.room_id)
current_state = list(current_state_map.values())
await self._get_room_member_handler().kick_guest_users(current_state)
@ -1374,7 +1374,7 @@ class FederationEventHandler:
if backfilled or event.internal_metadata.is_outlier():
return
extrem_ids_list = await self.store.get_latest_event_ids_in_room(event.room_id)
extrem_ids_list = await self._store.get_latest_event_ids_in_room(event.room_id)
extrem_ids = set(extrem_ids_list)
prev_event_ids = set(event.prev_event_ids())
@ -1383,7 +1383,7 @@ class FederationEventHandler:
# state at the event, so no point rechecking auth for soft fail.
return
room_version = await self.store.get_room_version_id(event.room_id)
room_version = await self._store.get_room_version_id(event.room_id)
room_version_obj = KNOWN_ROOM_VERSIONS[room_version]
# Calculate the "current state".
@ -1400,19 +1400,19 @@ class FederationEventHandler:
# given state at the event. This should correctly handle cases
# like bans, especially with state res v2.
state_sets_d = await self.state_store.get_state_groups(
state_sets_d = await self._state_store.get_state_groups(
event.room_id, extrem_ids
)
state_sets: List[Iterable[EventBase]] = list(state_sets_d.values())
state_sets.append(state)
current_states = await self.state_handler.resolve_events(
current_states = await self._state_handler.resolve_events(
room_version, state_sets, event
)
current_state_ids: StateMap[str] = {
k: e.event_id for k, e in current_states.items()
}
else:
current_state_ids = await self.state_handler.get_current_state_ids(
current_state_ids = await self._state_handler.get_current_state_ids(
event.room_id, latest_event_ids=extrem_ids
)
@ -1428,7 +1428,7 @@ class FederationEventHandler:
e for k, e in current_state_ids.items() if k in auth_types
]
auth_events_map = await self.store.get_events(current_state_ids_list)
auth_events_map = await self._store.get_events(current_state_ids_list)
current_auth_events = {
(e.type, e.state_key): e for e in auth_events_map.values()
}
@ -1499,7 +1499,9 @@ class FederationEventHandler:
#
# we start by checking if they are in the store, and then try calling /event_auth/.
if missing_auth:
have_events = await self.store.have_seen_events(event.room_id, missing_auth)
have_events = await self._store.have_seen_events(
event.room_id, missing_auth
)
logger.debug("Events %s are in the store", have_events)
missing_auth.difference_update(have_events)
@ -1508,7 +1510,7 @@ class FederationEventHandler:
logger.info("auth_events contains unknown events: %s", missing_auth)
try:
try:
remote_auth_chain = await self.federation_client.get_event_auth(
remote_auth_chain = await self._federation_client.get_event_auth(
origin, event.room_id, event.event_id
)
except RequestSendFailed as e1:
@ -1517,7 +1519,7 @@ class FederationEventHandler:
logger.info("Failed to get event auth from remote: %s", e1)
return context, auth_events
seen_remotes = await self.store.have_seen_events(
seen_remotes = await self._store.have_seen_events(
event.room_id, [e.event_id for e in remote_auth_chain]
)
@ -1543,7 +1545,7 @@ class FederationEventHandler:
e.event_id,
)
missing_auth_event_context = (
await self.state_handler.compute_event_context(e)
await self._state_handler.compute_event_context(e)
)
await self._auth_and_persist_event(
origin,
@ -1584,7 +1586,7 @@ class FederationEventHandler:
# XXX: currently this checks for redactions but I'm not convinced that is
# necessary?
different_events = await self.store.get_events_as_list(different_auth)
different_events = await self._store.get_events_as_list(different_auth)
for d in different_events:
if d.room_id != event.room_id:
@ -1610,8 +1612,8 @@ class FederationEventHandler:
remote_auth_events.update({(d.type, d.state_key): d for d in different_events})
remote_state = remote_auth_events.values()
room_version = await self.store.get_room_version_id(event.room_id)
new_state = await self.state_handler.resolve_events(
room_version = await self._store.get_room_version_id(event.room_id)
new_state = await self._state_handler.resolve_events(
room_version, (local_state, remote_state), event
)
@ -1669,7 +1671,7 @@ class FederationEventHandler:
# create a new state group as a delta from the existing one.
prev_group = context.state_group
state_group = await self.state_store.store_state_group(
state_group = await self._state_store.store_state_group(
event.event_id,
event.room_id,
prev_group=prev_group,
@ -1701,9 +1703,9 @@ class FederationEventHandler:
not event.internal_metadata.is_outlier()
and not backfilled
and not context.rejected
and (await self.store.get_min_depth(event.room_id)) <= event.depth
and (await self._store.get_min_depth(event.room_id)) <= event.depth
):
await self.action_generator.handle_push_actions_for_event(
await self._action_generator.handle_push_actions_for_event(
event, context
)
@ -1712,7 +1714,7 @@ class FederationEventHandler:
)
except Exception:
run_in_background(
self.store.remove_push_actions_from_staging, event.event_id
self._store.remove_push_actions_from_staging, event.event_id
)
raise
@ -1737,27 +1739,27 @@ class FederationEventHandler:
The stream ID after which all events have been persisted.
"""
if not event_and_contexts:
return self.store.get_current_events_token()
return self._store.get_current_events_token()
instance = self.config.worker.events_shard_config.get_instance(room_id)
instance = self._config.worker.events_shard_config.get_instance(room_id)
if instance != self._instance_name:
# Limit the number of events sent over replication. We choose 200
# here as that is what we default to in `max_request_body_size(..)`
for batch in batch_iter(event_and_contexts, 200):
result = await self._send_events(
instance_name=instance,
store=self.store,
store=self._store,
room_id=room_id,
event_and_contexts=batch,
backfilled=backfilled,
)
return result["max_stream_id"]
else:
assert self.storage.persistence
assert self._storage.persistence
# Note that this returns the events that were persisted, which may not be
# the same as were passed in if some were deduplicated due to transaction IDs.
events, max_stream_token = await self.storage.persistence.persist_events(
events, max_stream_token = await self._storage.persistence.persist_events(
event_and_contexts, backfilled=backfilled
)
@ -1791,7 +1793,7 @@ class FederationEventHandler:
# users
if event.internal_metadata.is_outlier():
if event.membership != Membership.INVITE:
if not self.is_mine_id(target_user_id):
if not self._is_mine_id(target_user_id):
return
target_user = UserID.from_string(target_user_id)
@ -1840,4 +1842,4 @@ class FederationEventHandler:
raise SynapseError(HTTPStatus.BAD_REQUEST, "Too many auth_events")
async def get_min_depth_for_context(self, context: str) -> int:
return await self.store.get_min_depth(context)
return await self._store.get_min_depth(context)