src/registry.py

   1 import logging
   2 import os
   3 import sqlite3
   4 import time
   5
   6 import misc
   7
   8 class Registry:
   9     def __init__(self, db_file):
  10         if not db_file: return
  11         if not os.path.isfile(db_file):
  12             self._conn = sqlite3.connect(db_file, check_same_thread=False)
  13             self._create_db()
  14         else:
  15             self._conn = sqlite3.connect(db_file, check_same_thread=False)
  16
  17     def is_registered(self, name):
  18         if not db_file: return False
  19         c = self._conn.cursor()
  20         c.execute("SELECT COUNT(*) FROM cache WHERE name=?", (name,))
  21         return c.fetchone() != None
  22
  23     def clean(self):
  24         if not db_file: return
  25         c = self._conn.cursor()
  26         c.execute("DELETE FROM cache WHERE access_time<?", (int(time.time()) - 604800,))
  27         self._conn.commit()
  28
  29
  30     def register(self, name):
  31         if not db_file: return
  32         c = self._conn.cursor()
  33         c.execute( '''INSERT INTO cache (name, access_time) VALUES (?, ?)''',
  34                    (name, int(time.time())) )
  35         self._conn.commit()
  36
  37     def refresh(self, name):
  38         if not db_file: return
  39         c = self._conn.cursor()
  40         c.execute( "UPDATE cache SET access_time=? WHERE name=?",
  41                    (int(time.time()), name) )
  42         self._conn.commit()
  43
  44     def _create_db(self):
  45         c = self._conn.cursor()
  46         c.execute('''CREATE TABLE cache (name TEXT PRIMARY KEY, access_time INTEGER)''')
  47         self._conn.commit()