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Add a lower bound for TTL on well known results.

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It costs both us and the remote server for us to fetch the well known
for every single request we send, so we add a minimum cache period. This
is set to 5m so that we still honour the basic premise of "refetch
frequently".
This commit is contained in:
Erik Johnston 2019-08-06 16:27:46 +01:00
parent d1b5b055be
commit af9f1c0764
2 changed files with 6 additions and 2 deletions
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4
synapse/http/federation/matrix_federation_agent.py
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@ -47,6 +47,9 @@ WELL_KNOWN_INVALID_CACHE_PERIOD = 1 * 3600
# cap for .well-known cache period
WELL_KNOWN_MAX_CACHE_PERIOD = 48 * 3600
# lower bound for .well-known cache period
WELL_KNOWN_MIN_CACHE_PERIOD = 5 * 60
logger = logging.getLogger(__name__)
well_known_cache = TTLCache("well-known")
@ -356,6 +359,7 @@ class MatrixFederationAgent(object):
cache_period += random.uniform(0, WELL_KNOWN_DEFAULT_CACHE_PERIOD_JITTER)
else:
cache_period = min(cache_period, WELL_KNOWN_MAX_CACHE_PERIOD)
cache_period = max(cache_period, WELL_KNOWN_MIN_CACHE_PERIOD)
return (result, cache_period)

4
tests/http/federation/test_matrix_federation_agent.py
View file

@ -953,7 +953,7 @@ class MatrixFederationAgentTests(TestCase):
well_known_server = self._handle_well_known_connection(
client_factory,
expected_sni=b"testserv",
response_headers={b"Cache-Control": b"max-age=10"},
response_headers={b"Cache-Control": b"max-age=1000"},
content=b'{ "m.server": "target-server" }',
)
@ -969,7 +969,7 @@ class MatrixFederationAgentTests(TestCase):
self.assertEqual(r, b"target-server")
# expire the cache
self.reactor.pump((10.0,))
self.reactor.pump((1000.0,))
# now it should connect again
fetch_d = self.do_get_well_known(b"testserv")