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Retry well-known lookup before expiry.

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This gives a bit of a grace period where we can attempt to refetch a
remote `well-known`, while still using the cached result if that fails.

Hopefully this will make the well-known resolution a bit more torelant
of failures, rather than it immediately treating failures as "no result"
and caching that for an hour.
This commit is contained in:
Erik Johnston 2019-08-12 15:39:14 +01:00
parent 0b6fbb28a8
commit 17e1e80726
4 changed files with 136 additions and 27 deletions
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4
tests/util/caches/test_ttlcache.py
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@ -36,7 +36,7 @@ class CacheTestCase(unittest.TestCase):
self.assertTrue("one" in self.cache)
self.assertEqual(self.cache.get("one"), "1")
self.assertEqual(self.cache["one"], "1")
self.assertEqual(self.cache.get_with_expiry("one"), ("1", 110))
self.assertEqual(self.cache.get_with_expiry("one"), ("1", 110, 10))
self.assertEqual(self.cache._metrics.hits, 3)
self.assertEqual(self.cache._metrics.misses, 0)
@ -77,7 +77,7 @@ class CacheTestCase(unittest.TestCase):
self.assertEqual(self.cache["two"], "2")
self.assertEqual(self.cache["three"], "3")
self.assertEqual(self.cache.get_with_expiry("two"), ("2", 120))
self.assertEqual(self.cache.get_with_expiry("two"), ("2", 120, 20))
self.assertEqual(self.cache._metrics.hits, 5)
self.assertEqual(self.cache._metrics.misses, 0)