Decodes input and encodes output

Currently novaclient doesn't handle properly incoming and outgoing
encode / decode process. As a solution for this, this patch implements a
decoding process for all data incoming from the user side and decodes
everything going out of the client, i.e: http requests, prints, etc.

This patch introduces a new module ( taken from
oslo-incubator in order to use 2 of the functions present in it:

About safe_(decode|encode):

    Both functions try to encode / decode the incoming text using the
    stdin encoding, fallback to python's default encoding if that
    returns None or to UTF-8 as the last option.

    In both functions only basestring objects are accepted and they both
    raise TypeError if an object of another type is passed.

About the general novaclient changes:

    In order to better support non-ASCII characters, it is a good
    practice to use unicode interanlly and encode everything that has to
    go out. This patch aims to do that and introduces this behaviour in
    the client.


    A good test (besides using tox) is to use nova client with and
    without setting any locale (export LANG=).

Fixes bug: 1061156

Change-Id: I20b75e42b0c3dac89f1048faa1127253a64f86c7
Flaper Fesp 10 years ago
parent 39b6e00eed
commit 47e6bc25ae

@ -0,0 +1,133 @@
# vim: tabstop=4 shiftwidth=4 softtabstop=4
# Copyright 2011 OpenStack LLC.
# All Rights Reserved.
# Licensed under the Apache License, Version 2.0 (the "License"); you may
# not use this file except in compliance with the License. You may obtain
# a copy of the License at
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
# License for the specific language governing permissions and limitations
# under the License.
System-level utilities and helper functions.
import logging
import sys
LOG = logging.getLogger(__name__)
def int_from_bool_as_string(subject):
Interpret a string as a boolean and return either 1 or 0.
Any string value in:
('True', 'true', 'On', 'on', '1')
is interpreted as a boolean True.
Useful for JSON-decoded stuff and config file parsing
return bool_from_string(subject) and 1 or 0
def bool_from_string(subject):
Interpret a string as a boolean.
Any string value in:
('True', 'true', 'On', 'on', 'Yes', 'yes', '1')
is interpreted as a boolean True.
Useful for JSON-decoded stuff and config file parsing
if isinstance(subject, bool):
return subject
if isinstance(subject, basestring):
if subject.strip().lower() in ('true', 'on', 'yes', '1'):
return True
return False
def safe_decode(text, incoming=None, errors='strict'):
Decodes incoming str using `incoming` if they're
not already unicode.
:param incoming: Text's current encoding
:param errors: Errors handling policy. See here for valid
:returns: text or a unicode `incoming` encoded
representation of it.
:raises TypeError: If text is not an isntance of basestring
if not isinstance(text, basestring):
raise TypeError("%s can't be decoded" % type(text))
if isinstance(text, unicode):
return text
if not incoming:
incoming = (sys.stdin.encoding or
return text.decode(incoming, errors)
except UnicodeDecodeError:
# Note(flaper87) If we get here, it means that
# sys.stdin.encoding / sys.getdefaultencoding
# didn't return a suitable encoding to decode
# text. This happens mostly when global LANG
# var is not set correctly and there's no
# default encoding. In this case, most likely
# python will use ASCII or ANSI encoders as
# default encodings but they won't be capable
# of decoding non-ASCII characters.
# Also, UTF-8 is being used since it's an ASCII
# extension.
return text.decode('utf-8', errors)
def safe_encode(text, incoming=None,
encoding='utf-8', errors='strict'):
Encodes incoming str/unicode using `encoding`. If
incoming is not specified, text is expected to
be encoded with current python's default encoding.
:param incoming: Text's current encoding
:param encoding: Expected encoding for text (Default UTF-8)
:param errors: Errors handling policy. See here for valid
:returns: text or a bytestring `encoding` encoded
representation of it.
:raises TypeError: If text is not an isntance of basestring
if not isinstance(text, basestring):
raise TypeError("%s can't be encoded" % type(text))
if not incoming:
incoming = (sys.stdin.encoding or
if isinstance(text, unicode):
return text.encode(encoding, errors)
elif text and encoding != incoming:
# Decode text before encoding it with `encoding`
text = safe_decode(text, incoming, errors)
return text.encode(encoding, errors)
return text

@ -49,6 +49,7 @@ import novaclient
from novaclient import client
from novaclient import exceptions as exc
import novaclient.extension
from novaclient.openstack.common import strutils
from novaclient import utils
from novaclient.v1_1 import shell as shell_v1_1
@ -738,11 +739,11 @@ class OpenStackHelpFormatter(argparse.HelpFormatter):
def main():
OpenStackComputeShell().main(map(strutils.safe_decode, sys.argv[1:]))
except Exception as e:
logger.debug(e, exc_info=1)
print("ERROR: %s" % unicode(e), file=sys.stderr)
print("ERROR: %s" % strutils.safe_encode(unicode(e)), file=sys.stderr)

@ -6,6 +6,7 @@ import uuid
import prettytable
from novaclient import exceptions
from novaclient.openstack.common import strutils
def arg(*args, **kwargs):
@ -139,7 +140,7 @@ def pretty_choice_list(l):
def print_list(objs, fields, formatters={}, sortby_index=0):
if sortby_index == None:
if sortby_index is None:
sortby = None
sortby = fields[sortby_index]
@ -162,9 +163,9 @@ def print_list(objs, fields, formatters={}, sortby_index=0):
if sortby is not None:
def print_dict(d, dict_property="Property"):
@ -184,7 +185,7 @@ def print_dict(d, dict_property="Property"):
col1 = ''
pt.add_row([k, v])
def find_resource(manager, name_or_id):
@ -203,9 +204,9 @@ def find_resource(manager, name_or_id):
# now try to get entity as uuid
return manager.get(name_or_id)
except (ValueError, exceptions.NotFound):
except (TypeError, ValueError, exceptions.NotFound):
# for str id which is not uuid (for Flavor search currently)

@ -18,6 +18,7 @@
import base64
from novaclient import base
from novaclient.openstack.common import strutils
# FIXME(sirp): Now that v1_0 has been removed, this can be merged with
@ -72,8 +73,8 @@ class BootingManagerWithFind(base.ManagerWithFind):
if userdata:
if hasattr(userdata, 'read'):
userdata =
elif isinstance(userdata, unicode):
userdata = userdata.encode('utf-8')
userdata = strutils.safe_encode(userdata)
body["server"]["user_data"] = base64.b64encode(userdata)
if meta:
body["server"]["metadata"] = meta

@ -1,7 +1,7 @@
# The list of modules to copy from openstack-common
# The base module to hold the copy of openstack.common