xsetbg_db.py

   1 #! /usr/bin/env python
   2 """XSetBg database
   3
   4 """
   5
   6 __author__ = "Oleg Broytman <phd@phdru.name>"
   7 __copyright__ = "Copyright (C) 2014, 2015 PhiloSoft Design"
   8 __license__ = "GNU GPL"
   9
  10 __all__ = ['xsetbg_db_path', 'xsetbg_db']
  11
  12 import os
  13 from sqlobject import SQLObject, connectionForURI, sqlhub, \
  14     UnicodeCol, IntCol, BoolCol, DatabaseIndex, dberrors
  15 from xsetbg_conf import xsetbg_conf
  16
  17
  18 class XSetBg(SQLObject):
  19     full_name = UnicodeCol(alternateID=True)
  20     last_shown = IntCol(default=None)  # timestamp
  21     flag = BoolCol(default=None)
  22
  23     last_shown_idx = DatabaseIndex('last_shown')
  24     flag_idx = DatabaseIndex('flag')
  25
  26
  27 def recreate_db():
  28     global xsetbg_db
  29     if not xsetbg_db:
  30         xsetbg_db = XSetBg
  31         xsetbg_db.createTable()
  32     return xsetbg_db
  33
  34
  35 class SQLiteMassInsert(object):
  36     def __init__(self):
  37         self.connection = sqlhub.processConnection
  38
  39     def __enter__(self):
  40         connection = self.connection
  41         connection.query("PRAGMA synchronous=OFF")
  42         connection.query("PRAGMA count_changes=OFF")
  43         connection.query("PRAGMA journal_mode=MEMORY")
  44         connection.query("PRAGMA temp_store=MEMORY")
  45
  46         txn = connection.transaction()
  47         sqlhub.processConnection = txn
  48         return txn
  49
  50     def __exit__(self, *args, **kw):
  51         sqlhub.processConnection.commit()
  52         connection = sqlhub.processConnection = self.connection
  53         connection.query("VACUUM %s" % xsetbg_db.sqlmeta.table)
  54
  55
  56 db_dirs = []
  57 try:
  58     xsetbg_db_path = xsetbg_conf.get('xsetbg', 'database')
  59 except:
  60     xsetbg_db_path = None
  61
  62 if not xsetbg_db_path:
  63     if 'XDG_CACHE_HOME' in os.environ:
  64         db_dirs.append(os.environ['XDG_CACHE_HOME'])
  65     home_cache = os.path.expanduser('~/.cache')
  66     if home_cache not in db_dirs:
  67         db_dirs.append(home_cache)
  68     db_dirs.append(os.path.dirname(os.path.abspath(__file__)))
  69
  70     for d in db_dirs:
  71         xsetbg_db_path = os.path.join(d, 'xsetbg.sqlite')
  72         if os.path.exists(xsetbg_db_path):
  73             break
  74
  75 if xsetbg_db_path:
  76     sqlhub.processConnection = \
  77         connectionForURI('sqlite:///%s' % xsetbg_db_path)
  78     try:
  79         XSetBg.select()[0]
  80     except IndexError:
  81         xsetbg_db = XSetBg  # Table exists but is empty
  82     except dberrors.Error:
  83         xsetbg_db = None
  84     else:
  85         xsetbg_db = XSetBg
  86 else:
  87     xsetbg_db = None
  88
  89 if __name__ == '__main__':
  90     print "DB dirs:", db_dirs
  91     print "DB file:", xsetbg_db_path