Write a working stub for DB maintenance component

torsearch/maintenance.py

@@ -0,0 +1,30 @@
+#!/usr/bin/env python
+# -*- coding: utf-8 -*-
+
+from torsearch import db, debug_logger
+
+def exec_transactionless_query(query):
+  '''DB operations like VACUUM ANALYZE require to be executed outside of
+  "BEGIN TRANSACTION" / "END TRANSACTION" blocks.
+  '''
+
+  conn = db.session.connection()
+  #conn.autocommit(False)
+  orig_ilevel = conn.isolation_level
+  try:
+    conn.set_isolation_level(0)
+    debug_logger.info('Running maintenance operation: %s', query)
+    db.session.execute(query)
+    debug_logger.info('Done running maintenance (%s)\nNotices: %s', query,
+      conn.notices)
+  except Exception as e:
+    debug_logger.error('Failed with error: %s', str(e))
+  finally:
+    #conn.autocommit(True)
+    conn.set_isolation_level(orig_ilevel)
+
+def vacuum_full_analyze(table):
+  exec_transactionless_query('VACUUM FULL ANALYZE VERBOSE ' + table)
+
+if __name__ == '__main__':
+  pass