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Make handle_new_client_event throws PartialStateConflictError (#14665)

Browse Source 
Then adapts calling code to retry when needed so it doesn't 500
to clients.

Signed-off-by: Mathieu Velten <mathieuv@matrix.org>
Co-authored-by: Sean Quah <8349537+squahtx@users.noreply.github.com>
This commit is contained in:
Mathieu Velten 2022-12-15 17:04:23 +01:00 committed by GitHub
parent 046320b9b6
commit 54c012c5a8
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GPG Key ID: 4AEE18F83AFDEB23
7 changed files with 366 additions and 245 deletions
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1
changelog.d/14665.misc Normal file
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@ -0,0 +1 @@
Change `handle_new_client_event` signature so that a 429 does not reach clients on `PartialStateConflictError`, and internally retry when needed instead.

49
synapse/handlers/federation.py
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@ -1343,7 +1343,16 @@ class FederationHandler:
)
EventValidator().validate_builder(builder)
event, context = await self.event_creation_handler.create_new_client_event(
# Try several times, it could fail with PartialStateConflictError
# in send_membership_event, cf comment in except block.
max_retries = 5
for i in range(max_retries):
try:
(
event,
context,
) = await self.event_creation_handler.create_new_client_event(
builder=builder
)
@ -1359,9 +1368,13 @@ class FederationHandler:
try:
validate_event_for_room_version(event)
await self._event_auth_handler.check_auth_rules_from_context(event)
await self._event_auth_handler.check_auth_rules_from_context(
event
)
except AuthError as e:
logger.warning("Denying new third party invite %r because %s", event, e)
logger.warning(
"Denying new third party invite %r because %s", event, e
)
raise e
await self._check_signature(event, context)
@ -1369,6 +1382,14 @@ class FederationHandler:
# We retrieve the room member handler here as to not cause a cyclic dependency
member_handler = self.hs.get_room_member_handler()
await member_handler.send_membership_event(None, event, context)
break
except PartialStateConflictError as e:
# Persisting couldn't happen because the room got un-partial stated
# in the meantime and context needs to be recomputed, so let's do so.
if i == max_retries - 1:
raise e
pass
else:
destinations = {x.split(":", 1)[-1] for x in (sender_user_id, room_id)}
@ -1400,7 +1421,15 @@ class FederationHandler:
room_version_obj, event_dict
)
event, context = await self.event_creation_handler.create_new_client_event(
# Try several times, it could fail with PartialStateConflictError
# in send_membership_event, cf comment in except block.
max_retries = 5
for i in range(max_retries):
try:
(
event,
context,
) = await self.event_creation_handler.create_new_client_event(
builder=builder
)
event, context = await self.add_display_name_to_third_party_invite(
@ -1417,12 +1446,22 @@ class FederationHandler:
# We need to tell the transaction queue to send this out, even
# though the sender isn't a local user.
event.internal_metadata.send_on_behalf_of = get_domain_from_id(event.sender)
event.internal_metadata.send_on_behalf_of = get_domain_from_id(
event.sender
)
# We retrieve the room member handler here as to not cause a cyclic dependency
member_handler = self.hs.get_room_member_handler()
await member_handler.send_membership_event(None, event, context)
break
except PartialStateConflictError as e:
# Persisting couldn't happen because the room got un-partial stated
# in the meantime and context needs to be recomputed, so let's do so.
if i == max_retries - 1:
raise e
pass
async def add_display_name_to_third_party_invite(
self,
room_version_obj: RoomVersion,

42
synapse/handlers/message.py
View File

@ -37,7 +37,6 @@ from synapse.api.errors import (
AuthError,
Codes,
ConsentNotGivenError,
LimitExceededError,
NotFoundError,
ShadowBanError,
SynapseError,
@ -999,6 +998,11 @@ class EventCreationHandler:
event.internal_metadata.stream_ordering,
)
# Try several times, it could fail with PartialStateConflictError
# in handle_new_client_event, cf comment in except block.
max_retries = 5
for i in range(max_retries):
try:
event, context = await self.create_event(
requester,
event_dict,
@ -1054,6 +1058,14 @@ class EventCreationHandler:
ignore_shadow_ban=ignore_shadow_ban,
)
break
except PartialStateConflictError as e:
# Persisting couldn't happen because the room got un-partial stated
# in the meantime and context needs to be recomputed, so let's do so.
if i == max_retries - 1:
raise e
pass
# we know it was persisted, so must have a stream ordering
assert ev.internal_metadata.stream_ordering
return ev, ev.internal_metadata.stream_ordering
@ -1356,7 +1368,7 @@ class EventCreationHandler:
Raises:
ShadowBanError if the requester has been shadow-banned.
SynapseError(503) if attempting to persist a partial state event in
PartialStateConflictError if attempting to persist a partial state event in
a room that has been un-partial stated.
"""
extra_users = extra_users or []
@ -1418,7 +1430,6 @@ class EventCreationHandler:
# We now persist the event (and update the cache in parallel, since we
# don't want to block on it).
event, context = events_and_context[0]
try:
result, _ = await make_deferred_yieldable(
gather_results(
(
@ -1431,21 +1442,11 @@ class EventCreationHandler:
),
run_in_background(
self.cache_joined_hosts_for_events, events_and_context
).addErrback(
log_failure, "cache_joined_hosts_for_event failed"
),
).addErrback(log_failure, "cache_joined_hosts_for_event failed"),
),
consumeErrors=True,
)
).addErrback(unwrapFirstError)
except PartialStateConflictError as e:
# The event context needs to be recomputed.
# Turn the error into a 429, as a hint to the client to try again.
logger.info(
"Room %s was un-partial stated while persisting client event.",
event.room_id,
)
raise LimitExceededError(msg=e.msg, errcode=e.errcode, retry_after_ms=0)
return result
@ -2011,6 +2012,11 @@ class EventCreationHandler:
members = await self.store.get_local_users_in_room(room_id)
for user_id in members:
requester = create_requester(user_id, authenticated_entity=self.server_name)
try:
# Try several times, it could fail with PartialStateConflictError
# in handle_new_client_event, cf comment in except block.
max_retries = 5
for i in range(max_retries):
try:
event, context = await self.create_event(
requester,
@ -2032,6 +2038,14 @@ class EventCreationHandler:
ratelimit=False,
ignore_shadow_ban=True,
)
break
except PartialStateConflictError as e:
# Persisting couldn't happen because the room got un-partial stated
# in the meantime and context needs to be recomputed, so let's do so.
if i == max_retries - 1:
raise e
pass
return True
except AuthError:
logger.info(

21
synapse/handlers/room.py
View File

@ -62,6 +62,7 @@ from synapse.events.utils import copy_and_fixup_power_levels_contents
from synapse.handlers.relations import BundledAggregations
from synapse.module_api import NOT_SPAM
from synapse.rest.admin._base import assert_user_is_admin
from synapse.storage.databases.main.events import PartialStateConflictError
from synapse.streams import EventSource
from synapse.types import (
JsonDict,
@ -207,6 +208,11 @@ class RoomCreationHandler:
new_room_id = self._generate_room_id()
# Try several times, it could fail with PartialStateConflictError
# in _upgrade_room, cf comment in except block.
max_retries = 5
for i in range(max_retries):
try:
# Check whether the user has the power level to carry out the upgrade.
# `check_auth_rules_from_context` will check that they are in the room and have
# the required power level to send the tombstone event.
@ -227,7 +233,9 @@ class RoomCreationHandler:
},
)
validate_event_for_room_version(tombstone_event)
await self._event_auth_handler.check_auth_rules_from_context(tombstone_event)
await self._event_auth_handler.check_auth_rules_from_context(
tombstone_event
)
# Upgrade the room
#
@ -247,6 +255,17 @@ class RoomCreationHandler:
)
return ret
except PartialStateConflictError as e:
# Clean up the cache so we can retry properly
self._upgrade_response_cache.unset((old_room_id, user_id))
# Persisting couldn't happen because the room got un-partial stated
# in the meantime and context needs to be recomputed, so let's do so.
if i == max_retries - 1:
raise e
pass
# This is to satisfy mypy and should never happen
raise PartialStateConflictError()
async def _upgrade_room(
self,

2
synapse/handlers/room_batch.py
View File

@ -375,6 +375,8 @@ class RoomBatchHandler:
# Events are sorted by (topological_ordering, stream_ordering)
# where topological_ordering is just depth.
for (event, context) in reversed(events_to_persist):
# This call can't raise `PartialStateConflictError` since we forbid
# use of the historical batch API during partial state
await self.event_creation_handler.handle_new_client_event(
await self.create_requester_for_user_id_from_app_service(
event.sender, app_service_requester.app_service

50
synapse/handlers/room_member.py
View File

@ -34,6 +34,7 @@ from synapse.events.snapshot import EventContext
from synapse.handlers.profile import MAX_AVATAR_URL_LEN, MAX_DISPLAYNAME_LEN
from synapse.logging import opentracing
from synapse.module_api import NOT_SPAM
from synapse.storage.databases.main.events import PartialStateConflictError
from synapse.types import (
JsonDict,
Requester,
@ -392,6 +393,11 @@ class RoomMemberHandler(metaclass=abc.ABCMeta):
event_pos = await self.store.get_position_for_event(existing_event_id)
return existing_event_id, event_pos.stream
# Try several times, it could fail with PartialStateConflictError,
# in handle_new_client_event, cf comment in except block.
max_retries = 5
for i in range(max_retries):
try:
event, context = await self.event_creation_handler.create_event(
requester,
{
@ -418,12 +424,16 @@ class RoomMemberHandler(metaclass=abc.ABCMeta):
StateFilter.from_types([(EventTypes.Member, None)])
)
prev_member_event_id = prev_state_ids.get((EventTypes.Member, user_id), None)
prev_member_event_id = prev_state_ids.get(
(EventTypes.Member, user_id), None
)
if event.membership == Membership.JOIN:
newly_joined = True
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
)
newly_joined = prev_member_event.membership != Membership.JOIN
# Only rate-limit if the user actually joined the room, otherwise we'll end
@ -434,19 +444,31 @@ class RoomMemberHandler(metaclass=abc.ABCMeta):
requester, key=room_id, update=False
)
with opentracing.start_active_span("handle_new_client_event"):
result_event = await self.event_creation_handler.handle_new_client_event(
result_event = (
await self.event_creation_handler.handle_new_client_event(
requester,
events_and_context=[(event, context)],
extra_users=[target],
ratelimit=ratelimit,
)
)
if event.membership == Membership.LEAVE:
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
)
if prev_member_event.membership == Membership.JOIN:
await self._user_left_room(target, room_id)
break
except PartialStateConflictError as e:
# Persisting couldn't happen because the room got un-partial stated
# in the meantime and context needs to be recomputed, so let's do so.
if i == max_retries - 1:
raise e
pass
# we know it was persisted, so should have a stream ordering
assert result_event.internal_metadata.stream_ordering
return result_event.event_id, result_event.internal_metadata.stream_ordering
@ -1234,6 +1256,8 @@ class RoomMemberHandler(metaclass=abc.ABCMeta):
ratelimit: Whether to rate limit this request.
Raises:
SynapseError if there was a problem changing the membership.
PartialStateConflictError: if attempting to persist a partial state event in
a room that has been un-partial stated.
"""
target_user = UserID.from_string(event.state_key)
room_id = event.room_id
@ -1863,6 +1887,11 @@ class RoomMemberMasterHandler(RoomMemberHandler):
list(previous_membership_event.auth_event_ids()) + prev_event_ids
)
# Try several times, it could fail with PartialStateConflictError
# in handle_new_client_event, cf comment in except block.
max_retries = 5
for i in range(max_retries):
try:
event, context = await self.event_creation_handler.create_event(
requester,
event_dict,
@ -1873,11 +1902,22 @@ class RoomMemberMasterHandler(RoomMemberHandler):
)
event.internal_metadata.out_of_band_membership = True
result_event = await self.event_creation_handler.handle_new_client_event(
result_event = (
await self.event_creation_handler.handle_new_client_event(
requester,
events_and_context=[(event, context)],
extra_users=[UserID.from_string(target_user)],
)
)
break
except PartialStateConflictError as e:
# Persisting couldn't happen because the room got un-partial stated
# in the meantime and context needs to be recomputed, so let's do so.
if i == max_retries - 1:
raise e
pass
# we know it was persisted, so must have a stream ordering
assert result_event.internal_metadata.stream_ordering

14
synapse/util/caches/response_cache.py
View File

@ -167,12 +167,10 @@ class ResponseCache(Generic[KV]):
# the should_cache bit, we leave it in the cache for now and schedule
# its removal later.
if self.timeout_sec and context.should_cache:
self.clock.call_later(
self.timeout_sec, self._result_cache.pop, key, None
)
self.clock.call_later(self.timeout_sec, self.unset, key)
else:
# otherwise, remove the result immediately.
self._result_cache.pop(key, None)
self.unset(key)
return r
# make sure we do this *after* adding the entry to result_cache,
@ -181,6 +179,14 @@ class ResponseCache(Generic[KV]):
result.addBoth(on_complete)
return entry
def unset(self, key: KV) -> None:
"""Remove the cached value for this key from the cache, if any.
Args:
key: key used to remove the cached value
"""
self._result_cache.pop(key, None)
async def wrap(
self,
key: KV,