deb-murano/murano/common/utils.py
enthurohini f49bdb6218 Drop types module usage
Since python 2.2, use of types module is not prefered way to
access the type hence it is replaced by using names of built-in
factory functions.

Change-Id: Ibdcc1ae75204f67076edab5edcffe94a9f1f1d8e
Implements: blueprint replace-types-module-with-new-style-classes
2015-11-02 18:39:24 +05:30

278 lines
8.5 KiB
Python

# Copyright (c) 2013 Mirantis, Inc.
#
# 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
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# 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.
import collections
import functools as func
import eventlet
import jsonschema
from oslo_log import log as logging
from murano.common.i18n import _, _LE
LOG = logging.getLogger(__name__)
class TraverseHelper(object):
value_type = (basestring, int, float, bool)
@staticmethod
def get(path, source):
"""Provides the ability to traverse a data source made up of any
combination of lists and dicts. Has simple rules for selecting item of
the list:
* each item should have id property
* to select item from the list, specify id value
Examples:
source = {'obj': {'attr': True}}
value = TraverseHelper.get('/obj/attr', source)
source = {'obj': [
{'id': '1', 'value': 1},
{'id': '2s', 'value': 2},
]}
value = TraverseHelper.get('/obj/2s/value', source)
:param path: string with path to desired value
:param source: python object (list or dict)
:return: object
:raise: ValueError if object is malformed
"""
queue = collections.deque(filter(lambda x: x, path.split('/')))
while len(queue):
path = queue.popleft()
if isinstance(source, list):
idx_source = source
iterator = (
i for i in source
if i.get('?', {}).get('id') == path
)
source = next(iterator, None)
if source is None and path.isdigit():
source = idx_source[int(path)]
elif isinstance(source, dict):
source = source[path]
elif isinstance(source, TraverseHelper.value_type):
break
else:
raise ValueError(_('Source object or path is malformed'))
return source
@staticmethod
def update(path, value, source):
"""Updates value selected with specified path.
Warning: Root object could not be updated
:param path: string with path to desired value
:param value: value
:param source: python object (list or dict)
"""
parent_path = '/'.join(path.split('/')[:-1])
node = TraverseHelper.get(parent_path, source)
key = path[1:].split('/')[-1]
node[key] = value
@staticmethod
def insert(path, value, source):
"""Inserts new item to selected list.
:param path: string with path to desired value
:param value: value
:param source: List
"""
node = TraverseHelper.get(path, source)
node.append(value)
@staticmethod
def extend(path, value, source):
"""Extend list by appending elements from the iterable.
:param path: string with path to desired value
:param value: value
:param source: List
"""
node = TraverseHelper.get(path, source)
node.extend(value)
@staticmethod
def remove(path, source):
"""Removes selected item from source.
:param path: string with path to desired value
:param source: python object (list or dict)
"""
parent_path = '/'.join(path.split('/')[:-1])
node = TraverseHelper.get(parent_path, source)
key = path[1:].split('/')[-1]
if isinstance(node, list):
iterator = (i for i in node if i.get('?', {}).get('id') == key)
item = next(iterator, None)
if item is None and key.isdigit():
del node[int(key)]
else:
node.remove(item)
elif isinstance(node, dict):
del node[key]
else:
raise ValueError(_('Source object or path is malformed'))
def is_different(obj1, obj2):
"""Stripped-down version of deep.diff comparator
Compares arbitrary nested objects, handles circular links, but doesn't
point to the first difference as deep.diff does.
"""
class Difference(Exception):
pass
def is_in(o, st):
for _o in st:
if o is _o:
return True
return False
def rec(o1, o2, stack1=(), stack2=()):
if is_in(o1, stack1) and is_in(o2, stack2):
# circular reference detected - break the loop
return
elif is_in(o1, stack1):
raise Difference()
else:
stack1 += (o1,)
stack2 += (o2,)
if o1 is o2:
return
elif (isinstance(o1, basestring) and
isinstance(o2, basestring)) and o1 == o2:
return
elif type(o1) != type(o2):
raise Difference()
elif isinstance(o1, dict):
# check for keys inequality
rec(o1.keys(), o2.keys(), stack1, stack2)
for key in o1.keys():
rec(o1[key], o2[key], stack1, stack2)
elif isinstance(o1, (list, tuple, set)):
if len(o1) != len(o2):
raise Difference()
else:
for _o1, _o2 in zip(o1, o2):
rec(_o1, _o2, stack1, stack2)
elif hasattr(o1, '__dict__'):
return rec(o1.__dict__, o2.__dict__, stack1, stack2)
elif o1 != o2:
raise Difference()
try:
rec(obj1, obj2)
except Difference:
return True
else:
return False
def build_entity_map(value):
def build_entity_map_recursive(value, id_map):
if isinstance(value, dict):
if '?' in value and 'id' in value['?']:
id_map[value['?']['id']] = value
for v in value.itervalues():
build_entity_map_recursive(v, id_map)
if isinstance(value, list):
for item in value:
build_entity_map_recursive(item, id_map)
id_map = {}
build_entity_map_recursive(value, id_map)
return id_map
def retry(ExceptionToCheck, tries=4, delay=3, backoff=2):
"""Retry calling the decorated function using an exponential backoff.
http://www.saltycrane.com/blog/2009/11/trying-out-retry-decorator-python/
original from: http://wiki.python.org/moin/PythonDecoratorLibrary#Retry
:param ExceptionToCheck: the exception to check. may be a tuple of
exceptions to check
:type ExceptionToCheck: Exception or tuple
:param tries: number of times to try (not retry) before giving up
:type tries: int
:param delay: initial delay between retries in seconds
:type delay: int
:param backoff: backoff multiplier e.g. value of 2 will double the delay
each retry
:type backoff: int
"""
def deco_retry(f):
@func.wraps(f)
def f_retry(*args, **kwargs):
mtries, mdelay = tries, delay
forever = mtries == -1
while forever or mtries > 1:
try:
return f(*args, **kwargs)
except ExceptionToCheck as e:
LOG.exception(_LE("An exception occured {exc}. Retrying in"
"{time} seconds").format(exc=e,
time=mdelay))
eventlet.sleep(mdelay)
if not forever:
mtries -= 1
if mdelay < 60:
mdelay *= backoff
return f(*args, **kwargs)
return f_retry
return deco_retry
def handle(f):
"""Handles exception in wrapped function and writes to LOG."""
@func.wraps(f)
def f_handle(*args, **kwargs):
try:
return f(*args, **kwargs)
except Exception as e:
LOG.exception(e)
return f_handle
def validate_body(schema):
def deco_validate_body(f):
@func.wraps(f)
def f_validate_body(*args, **kwargs):
if 'body' in kwargs:
jsonschema.validate(kwargs['body'], schema)
return f(*args, **kwargs)
return f_validate_body
return deco_validate_body