lib/tdb/_tdb_text.py

   1 # Text wrapper for tdb bindings
   2 #
   3 # Copyright (C) 2015 Petr Viktorin <pviktori@redhat.com>
   4 # Published under the GNU LGPLv3 or later
   5
   6 import sys
   7 import functools
   8
   9 import tdb
  10
  11
  12 class TdbTextWrapper(object):
  13     """Text interface for a TDB file"""
  14
  15     def __init__(self, tdb):
  16         self._tdb = tdb
  17
  18     @property
  19     def raw(self):
  20         return self._tdb
  21
  22     def get(self, key):
  23         key = key.encode('utf-8')
  24         result = self._tdb.get(key)
  25         if result is not None:
  26             return result.decode('utf-8')
  27
  28     def append(self, key, value):
  29         key = key.encode('utf-8')
  30         value = value.encode('utf-8')
  31         self._tdb.append(key, value)
  32
  33     def firstkey(self):
  34         result = self._tdb.firstkey()
  35         if result:
  36             return result.decode('utf-8')
  37
  38     def nextkey(self, key):
  39         key = key.encode('utf-8')
  40         result = self._tdb.nextkey(key)
  41         if result is not None:
  42             return result.decode('utf-8')
  43
  44     def delete(self, key):
  45         key = key.encode('utf-8')
  46         self._tdb.delete(key)
  47
  48     def store(self, key, value):
  49         key = key.encode('utf-8')
  50         value = value.encode('utf-8')
  51         self._tdb.store(key, value)
  52
  53     def __iter__(self):
  54         for key in iter(self._tdb):
  55             yield key.decode('utf-8')
  56
  57     def __getitem__(self, key):
  58         key = key.encode('utf-8')
  59         result = self._tdb[key]
  60         return result.decode('utf-8')
  61
  62     def __contains__(self, key):
  63         key = key.encode('utf-8')
  64         return key in self._tdb
  65
  66     def __repr__(self):
  67         return '<TdbTextWrapper for %r>' % self._tdb
  68
  69     def __setitem__(self, key, value):
  70         key = key.encode('utf-8')
  71         value = value.encode('utf-8')
  72         self._tdb[key] = value
  73
  74     def __delitem__(self, key):
  75         key = key.encode('utf-8')
  76         del self._tdb[key]
  77
  78     if sys.version_info > (3, 0):
  79         keys = __iter__
  80     else:
  81         iterkeys = __iter__
  82         has_key = __contains__
  83
  84
  85 ## Add wrappers for functions and getters that don't deal with text
  86
  87 def _add_wrapper(name):
  88     orig = getattr(tdb.Tdb, name)
  89
  90     def wrapper(self, *args, **kwargs):
  91         return orig(self._tdb, *args, **kwargs)
  92     wrapper.__name__ = orig.__name__
  93     wrapper.__doc__ = orig.__doc__
  94
  95     setattr(TdbTextWrapper, name, wrapper)
  96
  97 for name in ("transaction_cancel",
  98              "transaction_commit",
  99              "transaction_prepare_commit",
 100              "transaction_start",
 101              "reopen",
 102              "lock_all",
 103              "unlock_all",
 104              "read_lock_all",
 105              "read_unlock_all",
 106              "close",
 107              "add_flags",
 108              "remove_flags",
 109              "clear",
 110              "repack",
 111              "enable_seqnum",
 112              "increment_seqnum_nonblock",
 113             ):
 114     _add_wrapper(name)
 115
 116
 117 def _add_getter(name):
 118     orig = getattr(tdb.Tdb, name)
 119     doc = orig.__doc__
 120
 121     def getter(self):
 122         return getattr(self._tdb, name)
 123
 124     def setter(self, value):
 125         return setattr(self._tdb, name, value)
 126
 127     setattr(TdbTextWrapper, name, property(getter, setter, doc=doc))
 128
 129 for name in ("hash_size",
 130              "map_size",
 131              "freelist_size",
 132              "flags",
 133              "max_dead",
 134              "filename",
 135              "seqnum",
 136              "text",
 137             ):
 138     _add_getter(name)