mirror of
https://github.com/python/cpython.git
synced 2025-07-31 07:04:42 +00:00
64029986bc
bsddb.*open() methods cachesize parameter wouldn't work (raised an internal bsddb.db exception when it was given). The set_cachesize call needed to be moved from the DB object to the DBEnv since the env was introduced to allow for threading. (will backport to 2.4)
388 lines
12 KiB
Python
388 lines
12 KiB
Python
#----------------------------------------------------------------------
|
|
# Copyright (c) 1999-2001, Digital Creations, Fredericksburg, VA, USA
|
|
# and Andrew Kuchling. All rights reserved.
|
|
#
|
|
# Redistribution and use in source and binary forms, with or without
|
|
# modification, are permitted provided that the following conditions are
|
|
# met:
|
|
#
|
|
# o Redistributions of source code must retain the above copyright
|
|
# notice, this list of conditions, and the disclaimer that follows.
|
|
#
|
|
# o Redistributions in binary form must reproduce the above copyright
|
|
# notice, this list of conditions, and the following disclaimer in
|
|
# the documentation and/or other materials provided with the
|
|
# distribution.
|
|
#
|
|
# o Neither the name of Digital Creations nor the names of its
|
|
# contributors may be used to endorse or promote products derived
|
|
# from this software without specific prior written permission.
|
|
#
|
|
# THIS SOFTWARE IS PROVIDED BY DIGITAL CREATIONS AND CONTRIBUTORS *AS
|
|
# IS* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
|
|
# TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
|
|
# PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL DIGITAL
|
|
# CREATIONS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
|
|
# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
|
|
# BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
|
|
# OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
|
|
# ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
|
|
# TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE
|
|
# USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
|
|
# DAMAGE.
|
|
#----------------------------------------------------------------------
|
|
|
|
|
|
"""Support for BerkeleyDB 3.2 through 4.2.
|
|
"""
|
|
|
|
try:
|
|
if __name__ == 'bsddb3':
|
|
# import _pybsddb binary as it should be the more recent version from
|
|
# a standalone pybsddb addon package than the version included with
|
|
# python as bsddb._bsddb.
|
|
import _pybsddb
|
|
_bsddb = _pybsddb
|
|
else:
|
|
import _bsddb
|
|
except ImportError:
|
|
# Remove ourselves from sys.modules
|
|
import sys
|
|
del sys.modules[__name__]
|
|
raise
|
|
|
|
# bsddb3 calls it db, but provide _db for backwards compatibility
|
|
db = _db = _bsddb
|
|
__version__ = db.__version__
|
|
|
|
error = db.DBError # So bsddb.error will mean something...
|
|
|
|
#----------------------------------------------------------------------
|
|
|
|
import sys, os
|
|
|
|
# for backwards compatibility with python versions older than 2.3, the
|
|
# iterator interface is dynamically defined and added using a mixin
|
|
# class. old python can't tokenize it due to the yield keyword.
|
|
if sys.version >= '2.3':
|
|
import UserDict
|
|
from weakref import ref
|
|
exec """
|
|
class _iter_mixin(UserDict.DictMixin):
|
|
def _make_iter_cursor(self):
|
|
cur = self.db.cursor()
|
|
key = id(cur)
|
|
self._cursor_refs[key] = ref(cur, self._gen_cref_cleaner(key))
|
|
return cur
|
|
|
|
def _gen_cref_cleaner(self, key):
|
|
# use generate the function for the weakref callback here
|
|
# to ensure that we do not hold a strict reference to cur
|
|
# in the callback.
|
|
return lambda ref: self._cursor_refs.pop(key, None)
|
|
|
|
def __iter__(self):
|
|
try:
|
|
cur = self._make_iter_cursor()
|
|
|
|
# FIXME-20031102-greg: race condition. cursor could
|
|
# be closed by another thread before this call.
|
|
|
|
# since we're only returning keys, we call the cursor
|
|
# methods with flags=0, dlen=0, dofs=0
|
|
key = cur.first(0,0,0)[0]
|
|
yield key
|
|
|
|
next = cur.next
|
|
while 1:
|
|
try:
|
|
key = next(0,0,0)[0]
|
|
yield key
|
|
except _bsddb.DBCursorClosedError:
|
|
cur = self._make_iter_cursor()
|
|
# FIXME-20031101-greg: race condition. cursor could
|
|
# be closed by another thread before this call.
|
|
cur.set(key,0,0,0)
|
|
next = cur.next
|
|
except _bsddb.DBNotFoundError:
|
|
return
|
|
except _bsddb.DBCursorClosedError:
|
|
# the database was modified during iteration. abort.
|
|
return
|
|
|
|
def iteritems(self):
|
|
if not self.db:
|
|
return
|
|
try:
|
|
cur = self._make_iter_cursor()
|
|
|
|
# FIXME-20031102-greg: race condition. cursor could
|
|
# be closed by another thread before this call.
|
|
|
|
kv = cur.first()
|
|
key = kv[0]
|
|
yield kv
|
|
|
|
next = cur.next
|
|
while 1:
|
|
try:
|
|
kv = next()
|
|
key = kv[0]
|
|
yield kv
|
|
except _bsddb.DBCursorClosedError:
|
|
cur = self._make_iter_cursor()
|
|
# FIXME-20031101-greg: race condition. cursor could
|
|
# be closed by another thread before this call.
|
|
cur.set(key,0,0,0)
|
|
next = cur.next
|
|
except _bsddb.DBNotFoundError:
|
|
return
|
|
except _bsddb.DBCursorClosedError:
|
|
# the database was modified during iteration. abort.
|
|
return
|
|
"""
|
|
else:
|
|
class _iter_mixin: pass
|
|
|
|
|
|
class _DBWithCursor(_iter_mixin):
|
|
"""
|
|
A simple wrapper around DB that makes it look like the bsddbobject in
|
|
the old module. It uses a cursor as needed to provide DB traversal.
|
|
"""
|
|
def __init__(self, db):
|
|
self.db = db
|
|
self.db.set_get_returns_none(0)
|
|
|
|
# FIXME-20031101-greg: I believe there is still the potential
|
|
# for deadlocks in a multithreaded environment if someone
|
|
# attempts to use the any of the cursor interfaces in one
|
|
# thread while doing a put or delete in another thread. The
|
|
# reason is that _checkCursor and _closeCursors are not atomic
|
|
# operations. Doing our own locking around self.dbc,
|
|
# self.saved_dbc_key and self._cursor_refs could prevent this.
|
|
# TODO: A test case demonstrating the problem needs to be written.
|
|
|
|
# self.dbc is a DBCursor object used to implement the
|
|
# first/next/previous/last/set_location methods.
|
|
self.dbc = None
|
|
self.saved_dbc_key = None
|
|
|
|
# a collection of all DBCursor objects currently allocated
|
|
# by the _iter_mixin interface.
|
|
self._cursor_refs = {}
|
|
|
|
def __del__(self):
|
|
self.close()
|
|
|
|
def _checkCursor(self):
|
|
if self.dbc is None:
|
|
self.dbc = self.db.cursor()
|
|
if self.saved_dbc_key is not None:
|
|
self.dbc.set(self.saved_dbc_key)
|
|
self.saved_dbc_key = None
|
|
|
|
# This method is needed for all non-cursor DB calls to avoid
|
|
# BerkeleyDB deadlocks (due to being opened with DB_INIT_LOCK
|
|
# and DB_THREAD to be thread safe) when intermixing database
|
|
# operations that use the cursor internally with those that don't.
|
|
def _closeCursors(self, save=1):
|
|
if self.dbc:
|
|
c = self.dbc
|
|
self.dbc = None
|
|
if save:
|
|
try:
|
|
self.saved_dbc_key = c.current(0,0,0)[0]
|
|
except db.DBError:
|
|
pass
|
|
c.close()
|
|
del c
|
|
for cref in self._cursor_refs.values():
|
|
c = cref()
|
|
if c is not None:
|
|
c.close()
|
|
|
|
def _checkOpen(self):
|
|
if self.db is None:
|
|
raise error, "BSDDB object has already been closed"
|
|
|
|
def isOpen(self):
|
|
return self.db is not None
|
|
|
|
def __len__(self):
|
|
self._checkOpen()
|
|
return len(self.db)
|
|
|
|
def __getitem__(self, key):
|
|
self._checkOpen()
|
|
return self.db[key]
|
|
|
|
def __setitem__(self, key, value):
|
|
self._checkOpen()
|
|
self._closeCursors()
|
|
self.db[key] = value
|
|
|
|
def __delitem__(self, key):
|
|
self._checkOpen()
|
|
self._closeCursors()
|
|
del self.db[key]
|
|
|
|
def close(self):
|
|
self._closeCursors(save=0)
|
|
if self.dbc is not None:
|
|
self.dbc.close()
|
|
v = 0
|
|
if self.db is not None:
|
|
v = self.db.close()
|
|
self.dbc = None
|
|
self.db = None
|
|
return v
|
|
|
|
def keys(self):
|
|
self._checkOpen()
|
|
return self.db.keys()
|
|
|
|
def has_key(self, key):
|
|
self._checkOpen()
|
|
return self.db.has_key(key)
|
|
|
|
def set_location(self, key):
|
|
self._checkOpen()
|
|
self._checkCursor()
|
|
return self.dbc.set_range(key)
|
|
|
|
def next(self):
|
|
self._checkOpen()
|
|
self._checkCursor()
|
|
rv = self.dbc.next()
|
|
return rv
|
|
|
|
def previous(self):
|
|
self._checkOpen()
|
|
self._checkCursor()
|
|
rv = self.dbc.prev()
|
|
return rv
|
|
|
|
def first(self):
|
|
self._checkOpen()
|
|
self._checkCursor()
|
|
rv = self.dbc.first()
|
|
return rv
|
|
|
|
def last(self):
|
|
self._checkOpen()
|
|
self._checkCursor()
|
|
rv = self.dbc.last()
|
|
return rv
|
|
|
|
def sync(self):
|
|
self._checkOpen()
|
|
return self.db.sync()
|
|
|
|
|
|
#----------------------------------------------------------------------
|
|
# Compatibility object factory functions
|
|
|
|
def hashopen(file, flag='c', mode=0666, pgsize=None, ffactor=None, nelem=None,
|
|
cachesize=None, lorder=None, hflags=0):
|
|
|
|
flags = _checkflag(flag, file)
|
|
e = _openDBEnv(cachesize)
|
|
d = db.DB(e)
|
|
d.set_flags(hflags)
|
|
if pgsize is not None: d.set_pagesize(pgsize)
|
|
if lorder is not None: d.set_lorder(lorder)
|
|
if ffactor is not None: d.set_h_ffactor(ffactor)
|
|
if nelem is not None: d.set_h_nelem(nelem)
|
|
d.open(file, db.DB_HASH, flags, mode)
|
|
return _DBWithCursor(d)
|
|
|
|
#----------------------------------------------------------------------
|
|
|
|
def btopen(file, flag='c', mode=0666,
|
|
btflags=0, cachesize=None, maxkeypage=None, minkeypage=None,
|
|
pgsize=None, lorder=None):
|
|
|
|
flags = _checkflag(flag, file)
|
|
e = _openDBEnv(cachesize)
|
|
d = db.DB(e)
|
|
if pgsize is not None: d.set_pagesize(pgsize)
|
|
if lorder is not None: d.set_lorder(lorder)
|
|
d.set_flags(btflags)
|
|
if minkeypage is not None: d.set_bt_minkey(minkeypage)
|
|
if maxkeypage is not None: d.set_bt_maxkey(maxkeypage)
|
|
d.open(file, db.DB_BTREE, flags, mode)
|
|
return _DBWithCursor(d)
|
|
|
|
#----------------------------------------------------------------------
|
|
|
|
|
|
def rnopen(file, flag='c', mode=0666,
|
|
rnflags=0, cachesize=None, pgsize=None, lorder=None,
|
|
rlen=None, delim=None, source=None, pad=None):
|
|
|
|
flags = _checkflag(flag, file)
|
|
e = _openDBEnv(cachesize)
|
|
d = db.DB(e)
|
|
if pgsize is not None: d.set_pagesize(pgsize)
|
|
if lorder is not None: d.set_lorder(lorder)
|
|
d.set_flags(rnflags)
|
|
if delim is not None: d.set_re_delim(delim)
|
|
if rlen is not None: d.set_re_len(rlen)
|
|
if source is not None: d.set_re_source(source)
|
|
if pad is not None: d.set_re_pad(pad)
|
|
d.open(file, db.DB_RECNO, flags, mode)
|
|
return _DBWithCursor(d)
|
|
|
|
#----------------------------------------------------------------------
|
|
|
|
def _openDBEnv(cachesize):
|
|
e = db.DBEnv()
|
|
if cachesize is not None:
|
|
if cachesize >= 20480:
|
|
e.set_cachesize(0, cachesize)
|
|
else:
|
|
raise error, "cachesize must be >= 20480"
|
|
e.open('.', db.DB_PRIVATE | db.DB_CREATE | db.DB_THREAD | db.DB_INIT_LOCK | db.DB_INIT_MPOOL)
|
|
return e
|
|
|
|
def _checkflag(flag, file):
|
|
if flag == 'r':
|
|
flags = db.DB_RDONLY
|
|
elif flag == 'rw':
|
|
flags = 0
|
|
elif flag == 'w':
|
|
flags = db.DB_CREATE
|
|
elif flag == 'c':
|
|
flags = db.DB_CREATE
|
|
elif flag == 'n':
|
|
flags = db.DB_CREATE
|
|
#flags = db.DB_CREATE | db.DB_TRUNCATE
|
|
# we used db.DB_TRUNCATE flag for this before but BerkeleyDB
|
|
# 4.2.52 changed to disallowed truncate with txn environments.
|
|
if file is not None and os.path.isfile(file):
|
|
os.unlink(file)
|
|
else:
|
|
raise error, "flags should be one of 'r', 'w', 'c' or 'n'"
|
|
return flags | db.DB_THREAD
|
|
|
|
#----------------------------------------------------------------------
|
|
|
|
|
|
# This is a silly little hack that allows apps to continue to use the
|
|
# DB_THREAD flag even on systems without threads without freaking out
|
|
# BerkeleyDB.
|
|
#
|
|
# This assumes that if Python was built with thread support then
|
|
# BerkeleyDB was too.
|
|
|
|
try:
|
|
import thread
|
|
del thread
|
|
if db.version() < (3, 3, 0):
|
|
db.DB_THREAD = 0
|
|
except ImportError:
|
|
db.DB_THREAD = 0
|
|
|
|
|
|
#----------------------------------------------------------------------
|