/usr/share/doc/python-werkzeug-doc/examples/cupoftee/db.py is in python-werkzeug-doc 0.10.4+dfsg1-1ubuntu1.1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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"""
cupoftee.db
~~~~~~~~~~~
A simple object database. As long as the server is not running in
multiprocess mode that's good enough.
:copyright: (c) 2009 by the Werkzeug Team, see AUTHORS for more details.
:license: BSD, see LICENSE for more details.
"""
from __future__ import with_statement
import gdbm
from threading import Lock
from pickle import dumps, loads
class Database(object):
def __init__(self, filename):
self.filename = filename
self._fs = gdbm.open(filename, 'cf')
self._local = {}
self._lock = Lock()
def __getitem__(self, key):
with self._lock:
return self._load_key(key)
def _load_key(self, key):
if key in self._local:
return self._local[key]
rv = loads(self._fs[key])
self._local[key] = rv
return rv
def __setitem__(self, key, value):
self._local[key] = value
def __delitem__(self, key, value):
with self._lock:
self._local.pop(key, None)
if self._fs.has_key(key):
del self._fs[key]
def __del__(self):
self.close()
def __contains__(self, key):
with self._lock:
try:
self._load_key(key)
except KeyError:
pass
return key in self._local
def setdefault(self, key, factory):
with self._lock:
try:
rv = self._load_key(key)
except KeyError:
self._local[key] = rv = factory()
return rv
def sync(self):
with self._lock:
for key, value in self._local.iteritems():
self._fs[key] = dumps(value, 2)
self._fs.sync()
def close(self):
try:
self.sync()
self._fs.close()
except:
pass
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