diff --git a/synapse/storage/transactions.py b/synapse/storage/transactions.py
index baf0379a68..ab54977a75 100644
--- a/synapse/storage/transactions.py
+++ b/synapse/storage/transactions.py
@@ -23,6 +23,7 @@ from canonicaljson import encode_canonical_json
from twisted.internet import defer
from synapse.metrics.background_process_metrics import run_as_background_process
+from synapse.util.caches.expiringcache import ExpiringCache
from ._base import SQLBaseStore, db_to_json
@@ -49,6 +50,8 @@ _UpdateTransactionRow = namedtuple(
)
)
+SENTINEL = object()
+
class TransactionStore(SQLBaseStore):
"""A collection of queries for handling PDUs.
@@ -59,6 +62,12 @@ class TransactionStore(SQLBaseStore):
self._clock.looping_call(self._start_cleanup_transactions, 30 * 60 * 1000)
+ self._destination_retry_cache = ExpiringCache(
+ cache_name="get_destination_retry_timings",
+ clock=self._clock,
+ expiry_ms=5 * 60 * 1000,
+ )
+
def get_received_txn_response(self, transaction_id, origin):
"""For an incoming transaction from a given origin, check if we have
already responded to it. If so, return the response code and response
@@ -155,6 +164,7 @@ class TransactionStore(SQLBaseStore):
"""
pass
+ @defer.inlineCallbacks
def get_destination_retry_timings(self, destination):
"""Gets the current retry timings (if any) for a given destination.
@@ -165,10 +175,20 @@ class TransactionStore(SQLBaseStore):
None if not retrying
Otherwise a dict for the retry scheme
"""
- return self.runInteraction(
+
+ result = self._destination_retry_cache.get(destination, SENTINEL)
+ if result is not SENTINEL:
+ defer.returnValue(result)
+
+ result = yield self.runInteraction(
"get_destination_retry_timings",
self._get_destination_retry_timings, destination)
+ # We don't hugely care about race conditions between getting and
+ # invalidating the cache, since we time out fairly quickly anyway.
+ self._destination_retry_cache[destination] = result
+ defer.returnValue(result)
+
def _get_destination_retry_timings(self, txn, destination):
result = self._simple_select_one_txn(
txn,
@@ -196,6 +216,7 @@ class TransactionStore(SQLBaseStore):
retry_interval (int) - how long until next retry in ms
"""
+ self._destination_retry_cache.pop(destination)
return self.runInteraction(
"set_destination_retry_timings",
self._set_destination_retry_timings,
|
