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Instrument _check_sigs_and_hash_and_fetch to trace time spent in child concurrent calls (#13588)

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Instrument `_check_sigs_and_hash_and_fetch` to trace time spent in child concurrent calls because I've see `_check_sigs_and_hash_and_fetch` take [10.41s to process 100 events](https://github.com/matrix-org/synapse/issues/13587)

Fix https://github.com/matrix-org/synapse/issues/13587

Part of https://github.com/matrix-org/synapse/issues/13356
This commit is contained in:
Eric Eastwood 2022-08-23 21:53:37 -05:00 committed by GitHub
parent a25a37002c
commit 7af07f9716
No known key found for this signature in database
GPG Key ID: 4AEE18F83AFDEB23
5 changed files with 47 additions and 3 deletions
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1
changelog.d/13588.misc Normal file
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@ -0,0 +1 @@
Instrument `_check_sigs_and_hash_and_fetch` to trace time spent in child concurrent calls for understandable traces in Jaeger.

2
synapse/crypto/event_signing.py
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@ -28,6 +28,7 @@ from synapse.api.errors import Codes, SynapseError
from synapse.api.room_versions import RoomVersion
from synapse.events import EventBase
from synapse.events.utils import prune_event, prune_event_dict
from synapse.logging.opentracing import trace
from synapse.types import JsonDict
logger = logging.getLogger(__name__)
@ -35,6 +36,7 @@ logger = logging.getLogger(__name__)
Hasher = Callable[[bytes], "hashlib._Hash"]
@trace
def check_event_content_hash(
event: EventBase, hash_algorithm: Hasher = hashlib.sha256
) -> bool:

2
synapse/events/spamcheck.py
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@ -32,6 +32,7 @@ from typing_extensions import Literal
import synapse
from synapse.api.errors import Codes
from synapse.logging.opentracing import trace
from synapse.rest.media.v1._base import FileInfo
from synapse.rest.media.v1.media_storage import ReadableFileWrapper
from synapse.spam_checker_api import RegistrationBehaviour
@ -378,6 +379,7 @@ class SpamChecker:
if check_media_file_for_spam is not None:
self._check_media_file_for_spam_callbacks.append(check_media_file_for_spam)
@trace
async def check_event_for_spam(
self, event: "synapse.events.EventBase"
) -> Union[Tuple[Codes, JsonDict], str]:

22
synapse/federation/federation_base.py
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@ -23,6 +23,7 @@ from synapse.crypto.keyring import Keyring
from synapse.events import EventBase, make_event_from_dict
from synapse.events.utils import prune_event, validate_canonicaljson
from synapse.http.servlet import assert_params_in_dict
from synapse.logging.opentracing import log_kv, trace
from synapse.types import JsonDict, get_domain_from_id
if TYPE_CHECKING:
@ -55,6 +56,7 @@ class FederationBase:
self._clock = hs.get_clock()
self._storage_controllers = hs.get_storage_controllers()
@trace
async def _check_sigs_and_hash(
self, room_version: RoomVersion, pdu: EventBase
) -> EventBase:
@ -97,17 +99,36 @@ class FederationBase:
"Event %s seems to have been redacted; using our redacted copy",
pdu.event_id,
)
log_kv(
{
"message": "Event seems to have been redacted; using our redacted copy",
"event_id": pdu.event_id,
}
)
else:
logger.warning(
"Event %s content has been tampered, redacting",
pdu.event_id,
)
log_kv(
{
"message": "Event content has been tampered, redacting",
"event_id": pdu.event_id,
}
)
return redacted_event
spam_check = await self.spam_checker.check_event_for_spam(pdu)
if spam_check != self.spam_checker.NOT_SPAM:
logger.warning("Event contains spam, soft-failing %s", pdu.event_id)
log_kv(
{
"message": "Event contains spam, redacting (to save disk space) "
"as well as soft-failing (to stop using the event in prev_events)",
"event_id": pdu.event_id,
}
)
# we redact (to save disk space) as well as soft-failing (to stop
# using the event in prev_events).
redacted_event = prune_event(pdu)
@ -117,6 +138,7 @@ class FederationBase:
return pdu
@trace
async def _check_sigs_on_pdu(
keyring: Keyring, room_version: RoomVersion, pdu: EventBase
) -> None:

23
synapse/federation/federation_client.py
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@ -61,7 +61,7 @@ from synapse.federation.federation_base import (
)
from synapse.federation.transport.client import SendJoinResponse
from synapse.http.types import QueryParams
from synapse.logging.opentracing import SynapseTags, set_tag, tag_args, trace
from synapse.logging.opentracing import SynapseTags, log_kv, set_tag, tag_args, trace
from synapse.types import JsonDict, UserID, get_domain_from_id
from synapse.util.async_helpers import concurrently_execute
from synapse.util.caches.expiringcache import ExpiringCache
@ -587,11 +587,15 @@ class FederationClient(FederationBase):
Returns:
A list of PDUs that have valid signatures and hashes.
"""
set_tag(
SynapseTags.RESULT_PREFIX + "pdus.length",
str(len(pdus)),
)
# We limit how many PDUs we check at once, as if we try to do hundreds
# of thousands of PDUs at once we see large memory spikes.
valid_pdus = []
valid_pdus: List[EventBase] = []
async def _execute(pdu: EventBase) -> None:
valid_pdu = await self._check_sigs_and_hash_and_fetch_one(
@ -607,6 +611,8 @@ class FederationClient(FederationBase):
return valid_pdus
@trace
@tag_args
async def _check_sigs_and_hash_and_fetch_one(
self,
pdu: EventBase,
@ -639,16 +645,27 @@ class FederationClient(FederationBase):
except InvalidEventSignatureError as e:
logger.warning(
"Signature on retrieved event %s was invalid (%s). "
"Checking local store/orgin server",
"Checking local store/origin server",
pdu.event_id,
e,
)
log_kv(
{
"message": "Signature on retrieved event was invalid. "
"Checking local store/origin server",
"event_id": pdu.event_id,
"InvalidEventSignatureError": e,
}
)
# Check local db.
res = await self.store.get_event(
pdu.event_id, allow_rejected=True, allow_none=True
)
# If the PDU fails its signature check and we don't have it in our
# database, we then request it from sender's server (if that is not the
# same as `origin`).
pdu_origin = get_domain_from_id(pdu.sender)
if not res and pdu_origin != origin:
try: