xsetbg_db.py

   1 #! /usr/bin/env python
   2 """XSetBg database
   3
   4 """
   5
   6 import os
   7 from sqlobject import SQLObject, connectionForURI, sqlhub, \
   8     UnicodeCol, IntCol, BoolCol, DatabaseIndex, dberrors
   9 from xsetbg_conf import xsetbg_conf
  10
  11 __all__ = ['xsetbg_db_path', 'xsetbg_db']
  12
  13 # octal; -rw-------; make the database file(s) readable only by the user
  14 os.umask(0066)
  15
  16
  17 class XSetBg(SQLObject):
  18     full_name = UnicodeCol(alternateID=True)
  19     last_shown = IntCol(default=None)  # timestamp
  20     flag = BoolCol(default=None)
  21
  22     last_shown_idx = DatabaseIndex('last_shown')
  23     flag_idx = DatabaseIndex('flag')
  24
  25
  26 def recreate_db():
  27     global xsetbg_db
  28     if not xsetbg_db:
  29         xsetbg_db = XSetBg
  30         xsetbg_db.createTable()
  31     return xsetbg_db
  32
  33
  34 class SQLiteMassInsert(object):
  35     def __init__(self):
  36         self.connection = sqlhub.processConnection
  37
  38     def __enter__(self):
  39         connection = self.connection
  40         connection.query("PRAGMA synchronous=OFF")
  41         connection.query("PRAGMA count_changes=OFF")
  42         connection.query("PRAGMA journal_mode=MEMORY")
  43         connection.query("PRAGMA temp_store=MEMORY")
  44
  45         txn = connection.transaction()
  46         sqlhub.processConnection = txn
  47         return txn
  48
  49     def __exit__(self, *args, **kw):
  50         sqlhub.processConnection.commit()
  51         connection = sqlhub.processConnection = self.connection
  52         connection.query("VACUUM %s" % xsetbg_db.sqlmeta.table)
  53
  54
  55 db_dirs = []
  56 try:
  57     xsetbg_db_path = xsetbg_conf.get('xsetbg', 'database')
  58 except:
  59     xsetbg_db_path = None
  60
  61 if not xsetbg_db_path:
  62     if 'XDG_CACHE_HOME' in os.environ:
  63         db_dirs.append(os.environ['XDG_CACHE_HOME'])
  64     home_cache = os.path.expanduser('~/.cache')
  65     if home_cache not in db_dirs:
  66         db_dirs.append(home_cache)
  67     db_dirs.append(os.path.dirname(os.path.abspath(__file__)))
  68
  69     for d in db_dirs:
  70         xsetbg_db_path = os.path.join(d, 'xsetbg.sqlite')
  71         if os.path.exists(xsetbg_db_path):
  72             break
  73
  74 if xsetbg_db_path:
  75     sqlhub.processConnection = \
  76         connectionForURI('sqlite:///%s' % xsetbg_db_path)
  77     try:
  78         XSetBg.select()[0]
  79     except IndexError:
  80         xsetbg_db = XSetBg  # Table exists but is empty
  81     except dberrors.Error:
  82         xsetbg_db = None
  83     else:
  84         xsetbg_db = XSetBg
  85 else:
  86     xsetbg_db = None
  87
  88 if __name__ == '__main__':
  89     print "DB dirs:", db_dirs
  90     print "DB file:", xsetbg_db_path