remove RamSession patch

since patch has been incorporated into CherryPy
8030d8a5bf

CherryPy.conf

@@ -68,8 +68,6 @@ tools.I18nTool.mo_dir: CherryPyApp.install_dir + '/i18n'
 tools.I18nTool.domain: 'messages'
 
 tools.sessions.on: True
-tools.sessions.storage_class = sessions.RamSession
-#tools.sessions.storage_type = "postgres"
 tools.sessions.table_name = "cherrypy.sessions"
 tools.sessions.timeout: 30
 tools.sessions.path: '/'

sessions.py

@@ -1,43 +0,0 @@
-# will submit a PR to CherryPy project - if it gets merged we can remove it. ESH 8/15/2019
-import cherrypy
-from cherrypy.lib.sessions import RamSession as cpRamSession
-
-class RamSession(cpRamSession):
-    def clean_up(self):
-        """Clean up expired sessions."""
-
-        now = self.now()
-        try:
-            cache_items_copy = self.cache.copy().items()
-        except RuntimeError as re:
-            """Under heavy load, list(self.cache.items()) will occasionally raise this error
-            for large session caches with message "dictionary changed size during iteration"
-            Better to pause the cleanup than to let the cleanup thread die.
-            """
-            cherrypy.log(f'Runtime Error happened while copying the cache entries: {re}')
-            cherrypy.log('Ref: https://github.com/cherrypy/cherrypy/pull/1804')
-            return
-
-        for _id, (data, expiration_time) in cache_items_copy:
-            if expiration_time <= now:
-                try:
-                    del self.cache[_id]
-                except KeyError:
-                    pass
-                try:
-                    if self.locks[_id].acquire(blocking=False):
-                        lock = self.locks.pop(_id)
-                        lock.release()
-                except KeyError:
-                    pass
-
-
-        # added to remove obsolete lock objects
-        for _id in list(self.locks):
-            locked = (
-                _id not in self.cache
-                and self.locks[_id].acquire(blocking=False)
-            )
-            if locked:
-                lock = self.locks.pop(_id)
-                lock.release()