/usr/lib/python2.7/dist-packages/ZEO/zrpc/marshal.py is in python-zodb 1:3.10.7-1.
This file is owned by root:root, with mode 0o644.
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#
# Copyright (c) 2001, 2002 Zope Foundation and Contributors.
# All Rights Reserved.
#
# This software is subject to the provisions of the Zope Public License,
# Version 2.1 (ZPL). A copy of the ZPL should accompany this distribution.
# THIS SOFTWARE IS PROVIDED "AS IS" AND ANY AND ALL EXPRESS OR IMPLIED
# WARRANTIES ARE DISCLAIMED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
# WARRANTIES OF TITLE, MERCHANTABILITY, AGAINST INFRINGEMENT, AND FITNESS
# FOR A PARTICULAR PURPOSE
#
##############################################################################
from cPickle import Unpickler, Pickler
from cStringIO import StringIO
import logging
from ZEO.zrpc.error import ZRPCError
from ZEO.zrpc.log import log, short_repr
def encode(*args): # args: (msgid, flags, name, args)
# (We used to have a global pickler, but that's not thread-safe. :-( )
# It's not thread safe if, in the couse of pickling, we call the
# Python interpeter, which releases the GIL.
# Note that args may contain very large binary pickles already; for
# this reason, it's important to use proto 1 (or higher) pickles here
# too. For a long time, this used proto 0 pickles, and that can
# bloat our pickle to 4x the size (due to high-bit and control bytes
# being represented by \xij escapes in proto 0).
# Undocumented: cPickle.Pickler accepts a lone protocol argument;
# pickle.py does not.
pickler = Pickler(1)
pickler.fast = 1
return pickler.dump(args, 1)
@apply
def fast_encode():
# Only use in cases where you *know* the data contains only basic
# Python objects
pickler = Pickler(1)
pickler.fast = 1
dump = pickler.dump
def fast_encode(*args):
return dump(args, 1)
return fast_encode
def decode(msg):
"""Decodes msg and returns its parts"""
unpickler = Unpickler(StringIO(msg))
unpickler.find_global = find_global
try:
return unpickler.load() # msgid, flags, name, args
except:
log("can't decode message: %s" % short_repr(msg),
level=logging.ERROR)
raise
def server_decode(msg):
"""Decodes msg and returns its parts"""
unpickler = Unpickler(StringIO(msg))
unpickler.find_global = server_find_global
try:
return unpickler.load() # msgid, flags, name, args
except:
log("can't decode message: %s" % short_repr(msg),
level=logging.ERROR)
raise
_globals = globals()
_silly = ('__doc__',)
exception_type_type = type(Exception)
def find_global(module, name):
"""Helper for message unpickler"""
try:
m = __import__(module, _globals, _globals, _silly)
except ImportError, msg:
raise ZRPCError("import error %s: %s" % (module, msg))
try:
r = getattr(m, name)
except AttributeError:
raise ZRPCError("module %s has no global %s" % (module, name))
safe = getattr(r, '__no_side_effects__', 0)
if safe:
return r
# TODO: is there a better way to do this?
if type(r) == exception_type_type and issubclass(r, Exception):
return r
raise ZRPCError("Unsafe global: %s.%s" % (module, name))
def server_find_global(module, name):
"""Helper for message unpickler"""
try:
if module != 'ZopeUndo.Prefix':
raise ImportError
m = __import__(module, _globals, _globals, _silly)
except ImportError, msg:
raise ZRPCError("import error %s: %s" % (module, msg))
try:
r = getattr(m, name)
except AttributeError:
raise ZRPCError("module %s has no global %s" % (module, name))
return r
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