xep-0115: perf: avoid simultaneous disco info queries for the same verstring

tests/test_stream_xep_0115.py

@@ -0,0 +1,76 @@
+import logging
+import unittest
+from slixmpp.test import SlixTest
+
+
+class TestCaps(SlixTest):
+    def setUp(self):
+        self.stream_start(plugins=["xep_0115"])
+
+    def testConcurrentSameHash(self):
+        """
+        Check that we only resolve a given ver string to a disco info once,
+        even if we receive several presences with that same ver string
+        consecutively.
+        """
+        self.recv(  # language=XML
+            """
+            <presence from='romeo@montague.lit/orchard'>
+              <c xmlns='http://jabber.org/protocol/caps'
+                 hash='sha-1'
+                 node='a-node'
+                 ver='h0TdMvqNR8FHUfFG1HauOLYZDqE='/>
+            </presence>
+            """
+        )
+        self.recv(  # language=XML
+            """
+            <presence from='i-dont-know-much-shakespeare@montague.lit/orchard'>
+              <c xmlns='http://jabber.org/protocol/caps'
+                 hash='sha-1'
+                 node='a-node'
+                 ver='h0TdMvqNR8FHUfFG1HauOLYZDqE='/>
+            </presence>
+            """
+        )
+        self.send(  # language=XML
+            """
+            <iq xmlns="jabber:client"
+                id="1"
+                to="romeo@montague.lit/orchard"
+                type="get">
+              <query xmlns="http://jabber.org/protocol/disco#info"
+                     node="a-node#h0TdMvqNR8FHUfFG1HauOLYZDqE="/>
+            </iq>
+            """
+        )
+        self.send(None)
+        self.recv(  # language=XML
+            """
+            <iq from='romeo@montague.lit/orchard'
+                id='1'
+                type='result'>
+              <query xmlns='http://jabber.org/protocol/disco#info'
+                     node='a-nodes#h0TdMvqNR8FHUfFG1HauOLYZDqE='>
+                <identity category='client' name='a client' type='pc'/>
+                <feature var='http://jabber.org/protocol/caps'/>
+              </query>
+            </iq>
+            """
+        )
+        self.send(None)
+        self.assertTrue(
+            self.xmpp["xep_0030"].supports(
+                "romeo@montague.lit/orchard", "http://jabber.org/protocol/caps"
+            )
+        )
+        self.assertTrue(
+            self.xmpp["xep_0030"].supports(
+                "i-dont-know-much-shakespeare@montague.lit/orchard",
+                "http://jabber.org/protocol/caps",
+            )
+        )
+
+
+logging.basicConfig(level=logging.DEBUG)
+suite = unittest.TestLoader().loadTestsFromTestCase(TestCaps)