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Cache results of get_pdu.

This commit is contained in:
Erik Johnston 2015-02-16 18:02:39 +00:00
parent 2674aeb96a
commit baa5b9a975

View file

@ -19,7 +19,8 @@ from twisted.internet import defer
from .federation_base import FederationBase
from .units import Edu
from synapse.api.errors import CodeMessageException
from synapse.api.errors import CodeMessageException, SynapseError
from synapse.util.expiringcache import ExpiringCache
from synapse.util.logutils import log_function
from synapse.events import FrozenEvent
@ -30,6 +31,20 @@ logger = logging.getLogger(__name__)
class FederationClient(FederationBase):
def __init__(self):
self._fail_fetch_pdu_cache = None
def start_pdu_fail_cache(self):
self._fail_fetch_pdu_cache = ExpiringCache(
cache_name="get_pdu_cache",
clock=self._clock,
max_len=1000,
expiry_ms=120*1000,
reset_expiry_on_get=False,
)
self._fail_fetch_pdu_cache.start()
@log_function
def send_pdu(self, pdu, destinations):
"""Informs the replication layer about a new PDU generated within the
@ -160,6 +175,11 @@ class FederationClient(FederationBase):
# TODO: Rate limit the number of times we try and get the same event.
if self._fail_fetch_pdu_cache:
e = self._fail_fetch_pdu_cache.get(event_id)
if e:
defer.returnValue(e)
pdu = None
for destination in destinations:
try:
@ -181,8 +201,21 @@ class FederationClient(FederationBase):
pdu = yield self._check_sigs_and_hash(pdu)
break
except CodeMessageException:
raise
except SynapseError:
logger.info(
"Failed to get PDU %s from %s because %s",
event_id, destination, e,
)
continue
except CodeMessageException as e:
if 400 <= e.code < 500:
raise
logger.info(
"Failed to get PDU %s from %s because %s",
event_id, destination, e,
)
continue
except Exception as e:
logger.info(
"Failed to get PDU %s from %s because %s",
@ -190,6 +223,9 @@ class FederationClient(FederationBase):
)
continue
if self._fail_fetch_pdu_cache is not None:
self._fail_fetch_pdu_cache[event_id] = pdu
defer.returnValue(pdu)
@defer.inlineCallbacks