Remove old URLs when redirecting.

wsgi/library.py

 import random
+import time
 import math
 import site
 import MySQLdb
@@ -161,3 +162,13 @@ def register_url( longurl, shorturl, expiration ):
   cursor.execute( sql, (goconfig.sql_url_table, longurl, shorturl, expiration) )
   mdb.commit()
   mdb.close()
+
+
+# Removes any expired urls in the url table.
+def remove_expired_urls():
+  mdb, cursor = connect_to_mysql()
+  today = int(time.time())
+  sql = """DELETE FROM `%s` WHERE `expiration` > 0 AND `expiration` < %d;"""
+  cursor.execute( sql, (goconfig.sql_url_table, today) )
+  mdb.commit()
+  mdb.close()

wsgi/redir.py

@@ -6,6 +6,8 @@ import library
 import goconfig
 
 def application(environ, start_response):
+  # First things first - clear any old URL entries.
+  library.remove_expired_urls()
   
   # Construct the default body, along with its header/footer wrapper.
   body = ["<p>Nothing here.</p>"]