Add cleanup logic for old Beaker session data

pretty basic, but good enough for now

setup.py

@@ -179,6 +179,10 @@ setup(
             'webapi = tailbone.webapi:main',
         ],
 
+        'rattail.cleaners': [
+            'beaker = tailbone.cleanup:BeakerCleaner',
+        ],
+
         'rattail.config.extensions': [
             'tailbone = tailbone.config:ConfigExtension',
         ],

tailbone/cleanup.py

@@ -0,0 +1,80 @@
+# -*- coding: utf-8; -*-
+################################################################################
+#
+#  Rattail -- Retail Software Framework
+#  Copyright © 2010-2022 Lance Edgar
+#
+#  This file is part of Rattail.
+#
+#  Rattail is free software: you can redistribute it and/or modify it under the
+#  terms of the GNU General Public License as published by the Free Software
+#  Foundation, either version 3 of the License, or (at your option) any later
+#  version.
+#
+#  Rattail is distributed in the hope that it will be useful, but WITHOUT ANY
+#  WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+#  FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
+#  details.
+#
+#  You should have received a copy of the GNU General Public License along with
+#  Rattail.  If not, see <http://www.gnu.org/licenses/>.
+#
+################################################################################
+"""
+Cleanup logic
+"""
+
+from __future__ import unicode_literals, absolute_import
+
+import os
+import logging
+import time
+
+from rattail.cleanup import Cleaner
+
+
+log = logging.getLogger(__name__)
+
+
+class BeakerCleaner(Cleaner):
+    """
+    Cleanup logic for old Beaker session files.
+    """
+
+    def get_session_dir(self):
+        session_dir = self.config.get('rattail.cleanup', 'beaker.session_dir')
+        if session_dir and os.path.isdir(session_dir):
+            return session_dir
+
+        session_dir = os.path.join(self.config.appdir(), 'sessions')
+        if os.path.isdir(session_dir):
+            return session_dir
+
+    def cleanup(self, session, dry_run=False, progress=None, **kwargs):
+        session_dir = self.get_session_dir()
+        if not session_dir:
+            return
+
+        data_dir = os.path.join(session_dir, 'data')
+        lock_dir = os.path.join(session_dir, 'lock')
+
+        # looking for files older than X days
+        days = self.config.getint('rattail.cleanup',
+                                  'beaker.session_cutoff_days',
+                                  default=30)
+        cutoff = time.time() - 3600 * 24 * days
+
+        for topdir in (data_dir, lock_dir):
+            if not os.path.isdir(topdir):
+                continue
+
+            for dirpath, dirnames, filenames in os.walk(topdir):
+                for fname in filenames:
+                    path = os.path.join(dirpath, fname)
+                    ts = os.path.getmtime(path)
+                    if ts <= cutoff:
+                        if dry_run:
+                            log.debug("would delete file: %s", path)
+                        else:
+                            os.remove(path)
+                            log.debug("deleted file: %s", path)