Summary: Support selecion session/otk data store. Add redis as data store. Allow admin to select the backend data store. Compatibility matrix: main\/ session>| anydbm | sqlite | redis | mysql | postgresql | anydbm | D | | X | | | sqlite | X | D | X | | | mysql | | | | D | | postgresql | | | | | D | --------------------------------------------------------------+ D - default if unconfigured, X - compatible choice DETAILS roundup/configuration.py: add config.ini section sessiondb with settings: backend and redis_url. CHANGES.txt, doc/admin_guide.txt, doc/installation.txt, doc/upgrading.txt: doc on config of session db and redis. Plus some other fixes: admin - clarified why we do not drop __words and __testids table in native-fts conversion. TYpo fix. upgrading - doc how you can keep using anydbm for session data with sqlite. Fix dupe sentence in an upgrading config.ini section. roundup/backends/back_anydbm.py, roundup/backends/back_sqlite.py: code to support redis, redis/anydbm backends respectively. roundup/backends/sessions_redis.py new storage backend for redis. roundup/rest.py, roundup/cgi/actions.py, roundup/cgi/templating.py redis uses a different way of calculating lifetime/timestamp. Since expiration of an item occurred if its timestamp was more than 1 week old, code would calculate: now - 1 week + lifetime. But this results in faster expiration in redis if used for lifetime/timestamp. Convert code to use the lifetime() method in BasicDatabase that generates the right timestamp for each backend. test/session_common.py: added tests for more cases, get without default, getall non-existing key etc. timestamp test changed to use new self.get_ts which is overridden in other tests. Test that datatypes survive storage. test/test_redis_session.py: test redis session store with sqlite and anydbm primary databases test/test_anydbm.py, test/test_sqlite.py add test to make sure the databases are properly set up sqlite - add test cases where anydbm is used as datastore anydbm - remove updateTimestamp override add get_ts(). test/test_config.py tests on redis_url and compatibility on choice of sessiondb backend .travis.yml: add redis db and redis-py

--- a/test/test_anydbm.py	Wed Aug 03 17:34:58 2022 -0400
+++ b/test/test_anydbm.py	Thu Aug 04 14:41:58 2022 -0400
@@ -55,19 +55,13 @@
 class anydbmSessionTest(anydbmOpener, SessionTest, unittest.TestCase):
     s2b = lambda x,y: strings.s2b(y)
 
-    # this only works for dbm. other backends don't change the __timestamp
-    # value, they have a separate column for the timestamp so they can
-    # update it with SQL.
-    def testUpdateTimestamp(self):
-        # make sure timestamp is older than one minute so update will work
-        timestamp = time.time() - 62
-        self.sessions.set('random_session', text='hello, world!',
-                          __timestamp=timestamp)
-        self.sessions.updateTimestamp('random_session')
-        self.assertNotEqual (self.sessions.get('random_session',
-                                               '__timestamp'),
-                             timestamp)
+    def get_ts(self):
+        return (self.sessions.get('random_session', '__timestamp'),)
 
+    def testDbType(self):
+        self.assertIn("back_anydbm", repr(self.db))
+        self.assertIn("roundup.backends.sessions_dbm.Sessions", repr(self.db.Session))
+        
 class anydbmSpecialActionTestCase(anydbmOpener, SpecialActionTest,
                                   unittest.TestCase):
     backend = 'anydbm'