Ausgabe der neuen DB Einträge

venv/lib/python3.9/site-packages/twisted/names/test/test_cache.py

@@ -0,0 +1,144 @@
+# Copyright (c) Twisted Matrix Laboratories.
+# See LICENSE for details.
+
+"""
+Tests for L{twisted.names.cache}.
+"""
+
+from __future__ import division, absolute_import
+
+import time
+
+from zope.interface.verify import verifyClass
+
+from twisted.trial import unittest
+
+from twisted.names import dns, cache
+from twisted.internet import task, interfaces
+
+
+class CachingTests(unittest.TestCase):
+    """
+    Tests for L{cache.CacheResolver}.
+    """
+
+    def test_interface(self):
+        """
+        L{cache.CacheResolver} implements L{interfaces.IResolver}
+        """
+        verifyClass(interfaces.IResolver, cache.CacheResolver)
+
+
+    def test_lookup(self):
+        c = cache.CacheResolver({
+            dns.Query(name=b'example.com', type=dns.MX, cls=dns.IN):
+                (time.time(), ([], [], []))})
+        return c.lookupMailExchange(b'example.com').addCallback(
+            self.assertEqual, ([], [], []))
+
+
+    def test_constructorExpires(self):
+        """
+        Cache entries passed into L{cache.CacheResolver.__init__} get
+        cancelled just like entries added with cacheResult
+        """
+        r = ([dns.RRHeader(b"example.com", dns.A, dns.IN, 60,
+                           dns.Record_A("127.0.0.1", 60))],
+             [dns.RRHeader(b"example.com", dns.A, dns.IN, 50,
+                           dns.Record_A("127.0.0.1", 50))],
+             [dns.RRHeader(b"example.com", dns.A, dns.IN, 40,
+                           dns.Record_A("127.0.0.1", 40))])
+
+        clock = task.Clock()
+        query = dns.Query(name=b"example.com", type=dns.A, cls=dns.IN)
+
+        c = cache.CacheResolver({ query : (clock.seconds(), r)}, reactor=clock)
+
+        # 40 seconds is enough to expire the entry because expiration is based
+        # on the minimum TTL.
+        clock.advance(40)
+
+        self.assertNotIn(query, c.cache)
+
+        return self.assertFailure(
+            c.lookupAddress(b"example.com"), dns.DomainError)
+
+
+    def test_normalLookup(self):
+        """
+        When a cache lookup finds a cached entry from 1 second ago, it is
+        returned with a TTL of original TTL minus the elapsed 1 second.
+        """
+        r = ([dns.RRHeader(b"example.com", dns.A, dns.IN, 60,
+                           dns.Record_A("127.0.0.1", 60))],
+             [dns.RRHeader(b"example.com", dns.A, dns.IN, 50,
+                           dns.Record_A("127.0.0.1", 50))],
+             [dns.RRHeader(b"example.com", dns.A, dns.IN, 40,
+                           dns.Record_A("127.0.0.1", 40))])
+
+        clock = task.Clock()
+
+        c = cache.CacheResolver(reactor=clock)
+        c.cacheResult(dns.Query(name=b"example.com", type=dns.A, cls=dns.IN), r)
+
+        clock.advance(1)
+
+        def cbLookup(result):
+            self.assertEqual(result[0][0].ttl, 59)
+            self.assertEqual(result[1][0].ttl, 49)
+            self.assertEqual(result[2][0].ttl, 39)
+            self.assertEqual(result[0][0].name.name, b"example.com")
+
+        return c.lookupAddress(b"example.com").addCallback(cbLookup)
+
+
+    def test_cachedResultExpires(self):
+        """
+        Once the TTL has been exceeded, the result is removed from the cache.
+        """
+        r = ([dns.RRHeader(b"example.com", dns.A, dns.IN, 60,
+                           dns.Record_A("127.0.0.1", 60))],
+             [dns.RRHeader(b"example.com", dns.A, dns.IN, 50,
+                           dns.Record_A("127.0.0.1", 50))],
+             [dns.RRHeader(b"example.com", dns.A, dns.IN, 40,
+                           dns.Record_A("127.0.0.1", 40))])
+
+        clock = task.Clock()
+
+        c = cache.CacheResolver(reactor=clock)
+        query = dns.Query(name=b"example.com", type=dns.A, cls=dns.IN)
+        c.cacheResult(query, r)
+
+        clock.advance(40)
+
+        self.assertNotIn(query, c.cache)
+
+        return self.assertFailure(
+            c.lookupAddress(b"example.com"), dns.DomainError)
+
+
+    def test_expiredTTLLookup(self):
+        """
+        When the cache is queried exactly as the cached entry should expire but
+        before it has actually been cleared, the cache does not return the
+        expired entry.
+        """
+        r = ([dns.RRHeader(b"example.com", dns.A, dns.IN, 60,
+                           dns.Record_A("127.0.0.1", 60))],
+             [dns.RRHeader(b"example.com", dns.A, dns.IN, 50,
+                           dns.Record_A("127.0.0.1", 50))],
+             [dns.RRHeader(b"example.com", dns.A, dns.IN, 40,
+                           dns.Record_A("127.0.0.1", 40))])
+
+        clock = task.Clock()
+        # Make sure timeouts never happen, so entries won't get cleared:
+        clock.callLater = lambda *args, **kwargs: None
+
+        c = cache.CacheResolver({
+            dns.Query(name=b"example.com", type=dns.A, cls=dns.IN) :
+                (clock.seconds(), r)}, reactor=clock)
+
+        clock.advance(60.1)
+
+        return self.assertFailure(
+            c.lookupAddress(b"example.com"), dns.DomainError)