823 lines
27 KiB
Python
823 lines
27 KiB
Python
# vim: tabstop=4 shiftwidth=4 softtabstop=4
|
|
|
|
# Copyright 2010 United States Government as represented by the
|
|
# Administrator of the National Aeronautics and Space Administration.
|
|
# Copyright 2011 Justin Santa Barbara
|
|
# 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
|
|
#
|
|
# 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.
|
|
|
|
"""Utilities and helper functions."""
|
|
|
|
|
|
import contextlib
|
|
import datetime
|
|
import functools
|
|
import hashlib
|
|
import inspect
|
|
import os
|
|
import pyclbr
|
|
import random
|
|
import re
|
|
import shutil
|
|
import sys
|
|
import tempfile
|
|
import time
|
|
from xml.dom import minidom
|
|
from xml.parsers import expat
|
|
from xml import sax
|
|
from xml.sax import expatreader
|
|
from xml.sax import saxutils
|
|
|
|
from eventlet import event
|
|
from eventlet import greenthread
|
|
from eventlet import pools
|
|
from oslo.config import cfg
|
|
import paramiko
|
|
|
|
from cinder.brick.initiator import connector
|
|
from cinder import exception
|
|
from cinder.openstack.common import excutils
|
|
from cinder.openstack.common import gettextutils
|
|
from cinder.openstack.common import importutils
|
|
from cinder.openstack.common import lockutils
|
|
from cinder.openstack.common import log as logging
|
|
from cinder.openstack.common import processutils
|
|
from cinder.openstack.common import timeutils
|
|
|
|
|
|
CONF = cfg.CONF
|
|
LOG = logging.getLogger(__name__)
|
|
ISO_TIME_FORMAT = "%Y-%m-%dT%H:%M:%S"
|
|
PERFECT_TIME_FORMAT = "%Y-%m-%dT%H:%M:%S.%f"
|
|
|
|
synchronized = lockutils.synchronized_with_prefix('cinder-')
|
|
|
|
|
|
def find_config(config_path):
|
|
"""Find a configuration file using the given hint.
|
|
|
|
:param config_path: Full or relative path to the config.
|
|
:returns: Full path of the config, if it exists.
|
|
:raises: `cinder.exception.ConfigNotFound`
|
|
|
|
"""
|
|
possible_locations = [
|
|
config_path,
|
|
os.path.join(CONF.state_path, "etc", "cinder", config_path),
|
|
os.path.join(CONF.state_path, "etc", config_path),
|
|
os.path.join(CONF.state_path, config_path),
|
|
"/etc/cinder/%s" % config_path,
|
|
]
|
|
|
|
for path in possible_locations:
|
|
if os.path.exists(path):
|
|
return os.path.abspath(path)
|
|
|
|
raise exception.ConfigNotFound(path=os.path.abspath(config_path))
|
|
|
|
|
|
def as_int(obj, quiet=True):
|
|
# Try "2" -> 2
|
|
try:
|
|
return int(obj)
|
|
except (ValueError, TypeError):
|
|
pass
|
|
# Try "2.5" -> 2
|
|
try:
|
|
return int(float(obj))
|
|
except (ValueError, TypeError):
|
|
pass
|
|
# Eck, not sure what this is then.
|
|
if not quiet:
|
|
raise TypeError(_("Can not translate %s to integer.") % (obj))
|
|
return obj
|
|
|
|
|
|
def check_exclusive_options(**kwargs):
|
|
"""Checks that only one of the provided options is actually not-none.
|
|
|
|
Iterates over all the kwargs passed in and checks that only one of said
|
|
arguments is not-none, if more than one is not-none then an exception will
|
|
be raised with the names of those arguments who were not-none.
|
|
"""
|
|
|
|
if not kwargs:
|
|
return
|
|
|
|
pretty_keys = kwargs.pop("pretty_keys", True)
|
|
exclusive_options = {}
|
|
for (k, v) in kwargs.iteritems():
|
|
if v is not None:
|
|
exclusive_options[k] = True
|
|
|
|
if len(exclusive_options) > 1:
|
|
# Change the format of the names from pythonic to
|
|
# something that is more readable.
|
|
#
|
|
# Ex: 'the_key' -> 'the key'
|
|
if pretty_keys:
|
|
names = [k.replace('_', ' ') for k in kwargs.keys()]
|
|
else:
|
|
names = kwargs.keys()
|
|
names = ", ".join(sorted(names))
|
|
msg = (_("May specify only one of %s") % (names))
|
|
raise exception.InvalidInput(reason=msg)
|
|
|
|
|
|
def execute(*cmd, **kwargs):
|
|
"""Convenience wrapper around oslo's execute() method."""
|
|
if 'run_as_root' in kwargs and not 'root_helper' in kwargs:
|
|
kwargs['root_helper'] = get_root_helper()
|
|
return processutils.execute(*cmd, **kwargs)
|
|
|
|
|
|
def check_ssh_injection(cmd_list):
|
|
ssh_injection_pattern = ['`', '$', '|', '||', ';', '&', '&&', '>', '>>',
|
|
'<']
|
|
|
|
# Check whether injection attacks exist
|
|
for arg in cmd_list:
|
|
arg = arg.strip()
|
|
|
|
# Check for matching quotes on the ends
|
|
is_quoted = re.match('^(?P<quote>[\'"])(?P<quoted>.*)(?P=quote)$', arg)
|
|
if is_quoted:
|
|
# Check for unescaped quotes within the quoted argument
|
|
quoted = is_quoted.group('quoted')
|
|
if quoted:
|
|
if (re.match('[\'"]', quoted) or
|
|
re.search('[^\\\\][\'"]', quoted)):
|
|
raise exception.SSHInjectionThreat(command=str(cmd_list))
|
|
else:
|
|
# We only allow spaces within quoted arguments, and that
|
|
# is the only special character allowed within quotes
|
|
if len(arg.split()) > 1:
|
|
raise exception.SSHInjectionThreat(command=str(cmd_list))
|
|
|
|
# Second, check whether danger character in command. So the shell
|
|
# special operator must be a single argument.
|
|
for c in ssh_injection_pattern:
|
|
if arg == c:
|
|
continue
|
|
|
|
result = arg.find(c)
|
|
if not result == -1:
|
|
if result == 0 or not arg[result - 1] == '\\':
|
|
raise exception.SSHInjectionThreat(command=cmd_list)
|
|
|
|
|
|
def create_channel(client, width, height):
|
|
"""Invoke an interactive shell session on server."""
|
|
channel = client.invoke_shell()
|
|
channel.resize_pty(width, height)
|
|
return channel
|
|
|
|
|
|
class SSHPool(pools.Pool):
|
|
"""A simple eventlet pool to hold ssh connections."""
|
|
|
|
def __init__(self, ip, port, conn_timeout, login, password=None,
|
|
privatekey=None, *args, **kwargs):
|
|
self.ip = ip
|
|
self.port = port
|
|
self.login = login
|
|
self.password = password
|
|
self.conn_timeout = conn_timeout if conn_timeout else None
|
|
self.privatekey = privatekey
|
|
super(SSHPool, self).__init__(*args, **kwargs)
|
|
|
|
def create(self):
|
|
try:
|
|
ssh = paramiko.SSHClient()
|
|
ssh.set_missing_host_key_policy(paramiko.AutoAddPolicy())
|
|
if self.password:
|
|
ssh.connect(self.ip,
|
|
port=self.port,
|
|
username=self.login,
|
|
password=self.password,
|
|
timeout=self.conn_timeout)
|
|
elif self.privatekey:
|
|
pkfile = os.path.expanduser(self.privatekey)
|
|
privatekey = paramiko.RSAKey.from_private_key_file(pkfile)
|
|
ssh.connect(self.ip,
|
|
port=self.port,
|
|
username=self.login,
|
|
pkey=privatekey,
|
|
timeout=self.conn_timeout)
|
|
else:
|
|
msg = _("Specify a password or private_key")
|
|
raise exception.CinderException(msg)
|
|
|
|
# Paramiko by default sets the socket timeout to 0.1 seconds,
|
|
# ignoring what we set thru the sshclient. This doesn't help for
|
|
# keeping long lived connections. Hence we have to bypass it, by
|
|
# overriding it after the transport is initialized. We are setting
|
|
# the sockettimeout to None and setting a keepalive packet so that,
|
|
# the server will keep the connection open. All that does is send
|
|
# a keepalive packet every ssh_conn_timeout seconds.
|
|
if self.conn_timeout:
|
|
transport = ssh.get_transport()
|
|
transport.sock.settimeout(None)
|
|
transport.set_keepalive(self.conn_timeout)
|
|
return ssh
|
|
except Exception as e:
|
|
msg = _("Error connecting via ssh: %s") % e
|
|
LOG.error(msg)
|
|
raise paramiko.SSHException(msg)
|
|
|
|
def get(self):
|
|
"""
|
|
Return an item from the pool, when one is available. This may
|
|
cause the calling greenthread to block. Check if a connection is active
|
|
before returning it. For dead connections create and return a new
|
|
connection.
|
|
"""
|
|
conn = super(SSHPool, self).get()
|
|
if conn:
|
|
if conn.get_transport().is_active():
|
|
return conn
|
|
else:
|
|
conn.close()
|
|
return self.create()
|
|
|
|
def remove(self, ssh):
|
|
"""Close an ssh client and remove it from free_items."""
|
|
ssh.close()
|
|
ssh = None
|
|
if ssh in self.free_items:
|
|
self.free_items.pop(ssh)
|
|
if self.current_size > 0:
|
|
self.current_size -= 1
|
|
|
|
|
|
def cinderdir():
|
|
import cinder
|
|
return os.path.abspath(cinder.__file__).split('cinder/__init__.py')[0]
|
|
|
|
|
|
# Default symbols to use for passwords. Avoids visually confusing characters.
|
|
# ~6 bits per symbol
|
|
DEFAULT_PASSWORD_SYMBOLS = ('23456789', # Removed: 0,1
|
|
'ABCDEFGHJKLMNPQRSTUVWXYZ', # Removed: I, O
|
|
'abcdefghijkmnopqrstuvwxyz') # Removed: l
|
|
|
|
|
|
# ~5 bits per symbol
|
|
EASIER_PASSWORD_SYMBOLS = ('23456789', # Removed: 0, 1
|
|
'ABCDEFGHJKLMNPQRSTUVWXYZ') # Removed: I, O
|
|
|
|
|
|
def last_completed_audit_period(unit=None):
|
|
"""This method gives you the most recently *completed* audit period.
|
|
|
|
arguments:
|
|
units: string, one of 'hour', 'day', 'month', 'year'
|
|
Periods normally begin at the beginning (UTC) of the
|
|
period unit (So a 'day' period begins at midnight UTC,
|
|
a 'month' unit on the 1st, a 'year' on Jan, 1)
|
|
unit string may be appended with an optional offset
|
|
like so: 'day@18' This will begin the period at 18:00
|
|
UTC. 'month@15' starts a monthly period on the 15th,
|
|
and year@3 begins a yearly one on March 1st.
|
|
|
|
|
|
returns: 2 tuple of datetimes (begin, end)
|
|
The begin timestamp of this audit period is the same as the
|
|
end of the previous.
|
|
"""
|
|
if not unit:
|
|
unit = CONF.volume_usage_audit_period
|
|
|
|
offset = 0
|
|
if '@' in unit:
|
|
unit, offset = unit.split("@", 1)
|
|
offset = int(offset)
|
|
|
|
rightnow = timeutils.utcnow()
|
|
if unit not in ('month', 'day', 'year', 'hour'):
|
|
raise ValueError('Time period must be hour, day, month or year')
|
|
if unit == 'month':
|
|
if offset == 0:
|
|
offset = 1
|
|
end = datetime.datetime(day=offset,
|
|
month=rightnow.month,
|
|
year=rightnow.year)
|
|
if end >= rightnow:
|
|
year = rightnow.year
|
|
if 1 >= rightnow.month:
|
|
year -= 1
|
|
month = 12 + (rightnow.month - 1)
|
|
else:
|
|
month = rightnow.month - 1
|
|
end = datetime.datetime(day=offset,
|
|
month=month,
|
|
year=year)
|
|
year = end.year
|
|
if 1 >= end.month:
|
|
year -= 1
|
|
month = 12 + (end.month - 1)
|
|
else:
|
|
month = end.month - 1
|
|
begin = datetime.datetime(day=offset, month=month, year=year)
|
|
|
|
elif unit == 'year':
|
|
if offset == 0:
|
|
offset = 1
|
|
end = datetime.datetime(day=1, month=offset, year=rightnow.year)
|
|
if end >= rightnow:
|
|
end = datetime.datetime(day=1,
|
|
month=offset,
|
|
year=rightnow.year - 1)
|
|
begin = datetime.datetime(day=1,
|
|
month=offset,
|
|
year=rightnow.year - 2)
|
|
else:
|
|
begin = datetime.datetime(day=1,
|
|
month=offset,
|
|
year=rightnow.year - 1)
|
|
|
|
elif unit == 'day':
|
|
end = datetime.datetime(hour=offset,
|
|
day=rightnow.day,
|
|
month=rightnow.month,
|
|
year=rightnow.year)
|
|
if end >= rightnow:
|
|
end = end - datetime.timedelta(days=1)
|
|
begin = end - datetime.timedelta(days=1)
|
|
|
|
elif unit == 'hour':
|
|
end = rightnow.replace(minute=offset, second=0, microsecond=0)
|
|
if end >= rightnow:
|
|
end = end - datetime.timedelta(hours=1)
|
|
begin = end - datetime.timedelta(hours=1)
|
|
|
|
return (begin, end)
|
|
|
|
|
|
def generate_password(length=20, symbolgroups=DEFAULT_PASSWORD_SYMBOLS):
|
|
"""Generate a random password from the supplied symbol groups.
|
|
|
|
At least one symbol from each group will be included. Unpredictable
|
|
results if length is less than the number of symbol groups.
|
|
|
|
Believed to be reasonably secure (with a reasonable password length!)
|
|
|
|
"""
|
|
r = random.SystemRandom()
|
|
|
|
# NOTE(jerdfelt): Some password policies require at least one character
|
|
# from each group of symbols, so start off with one random character
|
|
# from each symbol group
|
|
password = [r.choice(s) for s in symbolgroups]
|
|
# If length < len(symbolgroups), the leading characters will only
|
|
# be from the first length groups. Try our best to not be predictable
|
|
# by shuffling and then truncating.
|
|
r.shuffle(password)
|
|
password = password[:length]
|
|
length -= len(password)
|
|
|
|
# then fill with random characters from all symbol groups
|
|
symbols = ''.join(symbolgroups)
|
|
password.extend([r.choice(symbols) for _i in xrange(length)])
|
|
|
|
# finally shuffle to ensure first x characters aren't from a
|
|
# predictable group
|
|
r.shuffle(password)
|
|
|
|
return ''.join(password)
|
|
|
|
|
|
def generate_username(length=20, symbolgroups=DEFAULT_PASSWORD_SYMBOLS):
|
|
# Use the same implementation as the password generation.
|
|
return generate_password(length, symbolgroups)
|
|
|
|
|
|
class LazyPluggable(object):
|
|
"""A pluggable backend loaded lazily based on some value."""
|
|
|
|
def __init__(self, pivot, **backends):
|
|
self.__backends = backends
|
|
self.__pivot = pivot
|
|
self.__backend = None
|
|
|
|
def __get_backend(self):
|
|
if not self.__backend:
|
|
backend_name = CONF[self.__pivot]
|
|
if backend_name not in self.__backends:
|
|
raise exception.Error(_('Invalid backend: %s') % backend_name)
|
|
|
|
backend = self.__backends[backend_name]
|
|
if isinstance(backend, tuple):
|
|
name = backend[0]
|
|
fromlist = backend[1]
|
|
else:
|
|
name = backend
|
|
fromlist = backend
|
|
|
|
self.__backend = __import__(name, None, None, fromlist)
|
|
LOG.debug(_('backend %s'), self.__backend)
|
|
return self.__backend
|
|
|
|
def __getattr__(self, key):
|
|
backend = self.__get_backend()
|
|
return getattr(backend, key)
|
|
|
|
|
|
class LoopingCallDone(Exception):
|
|
"""Exception to break out and stop a LoopingCall.
|
|
|
|
The poll-function passed to LoopingCall can raise this exception to
|
|
break out of the loop normally. This is somewhat analogous to
|
|
StopIteration.
|
|
|
|
An optional return-value can be included as the argument to the exception;
|
|
this return-value will be returned by LoopingCall.wait()
|
|
|
|
"""
|
|
|
|
def __init__(self, retvalue=True):
|
|
""":param retvalue: Value that LoopingCall.wait() should return."""
|
|
self.retvalue = retvalue
|
|
|
|
|
|
class LoopingCall(object):
|
|
def __init__(self, f=None, *args, **kw):
|
|
self.args = args
|
|
self.kw = kw
|
|
self.f = f
|
|
self._running = False
|
|
|
|
def start(self, interval, initial_delay=None):
|
|
self._running = True
|
|
done = event.Event()
|
|
|
|
def _inner():
|
|
if initial_delay:
|
|
greenthread.sleep(initial_delay)
|
|
|
|
try:
|
|
while self._running:
|
|
self.f(*self.args, **self.kw)
|
|
if not self._running:
|
|
break
|
|
greenthread.sleep(interval)
|
|
except LoopingCallDone as e:
|
|
self.stop()
|
|
done.send(e.retvalue)
|
|
except Exception:
|
|
LOG.exception(_('in looping call'))
|
|
done.send_exception(*sys.exc_info())
|
|
return
|
|
else:
|
|
done.send(True)
|
|
|
|
self.done = done
|
|
|
|
greenthread.spawn(_inner)
|
|
return self.done
|
|
|
|
def stop(self):
|
|
self._running = False
|
|
|
|
def wait(self):
|
|
return self.done.wait()
|
|
|
|
|
|
class ProtectedExpatParser(expatreader.ExpatParser):
|
|
"""An expat parser which disables DTD's and entities by default."""
|
|
|
|
def __init__(self, forbid_dtd=True, forbid_entities=True,
|
|
*args, **kwargs):
|
|
# Python 2.x old style class
|
|
expatreader.ExpatParser.__init__(self, *args, **kwargs)
|
|
self.forbid_dtd = forbid_dtd
|
|
self.forbid_entities = forbid_entities
|
|
|
|
def start_doctype_decl(self, name, sysid, pubid, has_internal_subset):
|
|
raise ValueError("Inline DTD forbidden")
|
|
|
|
def entity_decl(self, entityName, is_parameter_entity, value, base,
|
|
systemId, publicId, notationName):
|
|
raise ValueError("<!ENTITY> forbidden")
|
|
|
|
def unparsed_entity_decl(self, name, base, sysid, pubid, notation_name):
|
|
# expat 1.2
|
|
raise ValueError("<!ENTITY> forbidden")
|
|
|
|
def reset(self):
|
|
expatreader.ExpatParser.reset(self)
|
|
if self.forbid_dtd:
|
|
self._parser.StartDoctypeDeclHandler = self.start_doctype_decl
|
|
if self.forbid_entities:
|
|
self._parser.EntityDeclHandler = self.entity_decl
|
|
self._parser.UnparsedEntityDeclHandler = self.unparsed_entity_decl
|
|
|
|
|
|
def safe_minidom_parse_string(xml_string):
|
|
"""Parse an XML string using minidom safely.
|
|
|
|
"""
|
|
try:
|
|
return minidom.parseString(xml_string, parser=ProtectedExpatParser())
|
|
except sax.SAXParseException as se:
|
|
raise expat.ExpatError()
|
|
|
|
|
|
def xhtml_escape(value):
|
|
"""Escapes a string so it is valid within XML or XHTML.
|
|
|
|
"""
|
|
return saxutils.escape(value, {'"': '"', "'": '''})
|
|
|
|
|
|
def get_from_path(items, path):
|
|
"""Returns a list of items matching the specified path.
|
|
|
|
Takes an XPath-like expression e.g. prop1/prop2/prop3, and for each item
|
|
in items, looks up items[prop1][prop2][prop3]. Like XPath, if any of the
|
|
intermediate results are lists it will treat each list item individually.
|
|
A 'None' in items or any child expressions will be ignored, this function
|
|
will not throw because of None (anywhere) in items. The returned list
|
|
will contain no None values.
|
|
|
|
"""
|
|
if path is None:
|
|
raise exception.Error('Invalid mini_xpath')
|
|
|
|
(first_token, sep, remainder) = path.partition('/')
|
|
|
|
if first_token == '':
|
|
raise exception.Error('Invalid mini_xpath')
|
|
|
|
results = []
|
|
|
|
if items is None:
|
|
return results
|
|
|
|
if not isinstance(items, list):
|
|
# Wrap single objects in a list
|
|
items = [items]
|
|
|
|
for item in items:
|
|
if item is None:
|
|
continue
|
|
get_method = getattr(item, 'get', None)
|
|
if get_method is None:
|
|
continue
|
|
child = get_method(first_token)
|
|
if child is None:
|
|
continue
|
|
if isinstance(child, list):
|
|
# Flatten intermediate lists
|
|
for x in child:
|
|
results.append(x)
|
|
else:
|
|
results.append(child)
|
|
|
|
if not sep:
|
|
# No more tokens
|
|
return results
|
|
else:
|
|
return get_from_path(results, remainder)
|
|
|
|
|
|
def is_valid_boolstr(val):
|
|
"""Check if the provided string is a valid bool string or not."""
|
|
val = str(val).lower()
|
|
return (val == 'true' or val == 'false' or
|
|
val == 'yes' or val == 'no' or
|
|
val == 'y' or val == 'n' or
|
|
val == '1' or val == '0')
|
|
|
|
|
|
def monkey_patch():
|
|
"""If the CONF.monkey_patch set as True,
|
|
this function patches a decorator
|
|
for all functions in specified modules.
|
|
|
|
You can set decorators for each modules
|
|
using CONF.monkey_patch_modules.
|
|
The format is "Module path:Decorator function".
|
|
Example: 'cinder.api.ec2.cloud:' \
|
|
cinder.openstack.common.notifier.api.notify_decorator'
|
|
|
|
Parameters of the decorator is as follows.
|
|
(See cinder.openstack.common.notifier.api.notify_decorator)
|
|
|
|
name - name of the function
|
|
function - object of the function
|
|
"""
|
|
# If CONF.monkey_patch is not True, this function do nothing.
|
|
if not CONF.monkey_patch:
|
|
return
|
|
# Get list of modules and decorators
|
|
for module_and_decorator in CONF.monkey_patch_modules:
|
|
module, decorator_name = module_and_decorator.split(':')
|
|
# import decorator function
|
|
decorator = importutils.import_class(decorator_name)
|
|
__import__(module)
|
|
# Retrieve module information using pyclbr
|
|
module_data = pyclbr.readmodule_ex(module)
|
|
for key in module_data.keys():
|
|
# set the decorator for the class methods
|
|
if isinstance(module_data[key], pyclbr.Class):
|
|
clz = importutils.import_class("%s.%s" % (module, key))
|
|
for method, func in inspect.getmembers(clz, inspect.ismethod):
|
|
setattr(
|
|
clz, method,
|
|
decorator("%s.%s.%s" % (module, key, method), func))
|
|
# set the decorator for the function
|
|
if isinstance(module_data[key], pyclbr.Function):
|
|
func = importutils.import_class("%s.%s" % (module, key))
|
|
setattr(sys.modules[module], key,
|
|
decorator("%s.%s" % (module, key), func))
|
|
|
|
|
|
def generate_glance_url():
|
|
"""Generate the URL to glance."""
|
|
# TODO(jk0): This will eventually need to take SSL into consideration
|
|
# when supported in glance.
|
|
return "http://%s:%d" % (CONF.glance_host, CONF.glance_port)
|
|
|
|
|
|
def make_dev_path(dev, partition=None, base='/dev'):
|
|
"""Return a path to a particular device.
|
|
|
|
>>> make_dev_path('xvdc')
|
|
/dev/xvdc
|
|
|
|
>>> make_dev_path('xvdc', 1)
|
|
/dev/xvdc1
|
|
"""
|
|
path = os.path.join(base, dev)
|
|
if partition:
|
|
path += str(partition)
|
|
return path
|
|
|
|
|
|
def total_seconds(td):
|
|
"""Local total_seconds implementation for compatibility with python 2.6"""
|
|
if hasattr(td, 'total_seconds'):
|
|
return td.total_seconds()
|
|
else:
|
|
return ((td.days * 86400 + td.seconds) * 10 ** 6 +
|
|
td.microseconds) / 10.0 ** 6
|
|
|
|
|
|
def sanitize_hostname(hostname):
|
|
"""Return a hostname which conforms to RFC-952 and RFC-1123 specs."""
|
|
if isinstance(hostname, unicode):
|
|
hostname = hostname.encode('latin-1', 'ignore')
|
|
|
|
hostname = re.sub('[ _]', '-', hostname)
|
|
hostname = re.sub('[^\w.-]+', '', hostname)
|
|
hostname = hostname.lower()
|
|
hostname = hostname.strip('.-')
|
|
|
|
return hostname
|
|
|
|
|
|
def read_cached_file(filename, cache_info, reload_func=None):
|
|
"""Read from a file if it has been modified.
|
|
|
|
:param cache_info: dictionary to hold opaque cache.
|
|
:param reload_func: optional function to be called with data when
|
|
file is reloaded due to a modification.
|
|
|
|
:returns: data from file
|
|
|
|
"""
|
|
mtime = os.path.getmtime(filename)
|
|
if not cache_info or mtime != cache_info.get('mtime'):
|
|
with open(filename) as fap:
|
|
cache_info['data'] = fap.read()
|
|
cache_info['mtime'] = mtime
|
|
if reload_func:
|
|
reload_func(cache_info['data'])
|
|
return cache_info['data']
|
|
|
|
|
|
def hash_file(file_like_object):
|
|
"""Generate a hash for the contents of a file."""
|
|
checksum = hashlib.sha1()
|
|
any(map(checksum.update, iter(lambda: file_like_object.read(32768), '')))
|
|
return checksum.hexdigest()
|
|
|
|
|
|
def service_is_up(service):
|
|
"""Check whether a service is up based on last heartbeat."""
|
|
last_heartbeat = service['updated_at'] or service['created_at']
|
|
# Timestamps in DB are UTC.
|
|
elapsed = total_seconds(timeutils.utcnow() - last_heartbeat)
|
|
return abs(elapsed) <= CONF.service_down_time
|
|
|
|
|
|
def read_file_as_root(file_path):
|
|
"""Secure helper to read file as root."""
|
|
try:
|
|
out, _err = execute('cat', file_path, run_as_root=True)
|
|
return out
|
|
except processutils.ProcessExecutionError:
|
|
raise exception.FileNotFound(file_path=file_path)
|
|
|
|
|
|
@contextlib.contextmanager
|
|
def temporary_chown(path, owner_uid=None):
|
|
"""Temporarily chown a path.
|
|
|
|
:params owner_uid: UID of temporary owner (defaults to current user)
|
|
"""
|
|
if owner_uid is None:
|
|
owner_uid = os.getuid()
|
|
|
|
orig_uid = os.stat(path).st_uid
|
|
|
|
if orig_uid != owner_uid:
|
|
execute('chown', owner_uid, path, run_as_root=True)
|
|
try:
|
|
yield
|
|
finally:
|
|
if orig_uid != owner_uid:
|
|
execute('chown', orig_uid, path, run_as_root=True)
|
|
|
|
|
|
@contextlib.contextmanager
|
|
def tempdir(**kwargs):
|
|
tmpdir = tempfile.mkdtemp(**kwargs)
|
|
try:
|
|
yield tmpdir
|
|
finally:
|
|
try:
|
|
shutil.rmtree(tmpdir)
|
|
except OSError as e:
|
|
LOG.debug(_('Could not remove tmpdir: %s'), str(e))
|
|
|
|
|
|
def walk_class_hierarchy(clazz, encountered=None):
|
|
"""Walk class hierarchy, yielding most derived classes first"""
|
|
if not encountered:
|
|
encountered = []
|
|
for subclass in clazz.__subclasses__():
|
|
if subclass not in encountered:
|
|
encountered.append(subclass)
|
|
# drill down to leaves first
|
|
for subsubclass in walk_class_hierarchy(subclass, encountered):
|
|
yield subsubclass
|
|
yield subclass
|
|
|
|
|
|
def get_root_helper():
|
|
return 'sudo cinder-rootwrap %s' % CONF.rootwrap_config
|
|
|
|
|
|
def brick_get_connector_properties():
|
|
"""wrapper for the brick calls to automatically set
|
|
the root_helper needed for cinder.
|
|
"""
|
|
|
|
root_helper = get_root_helper()
|
|
return connector.get_connector_properties(root_helper,
|
|
CONF.my_ip)
|
|
|
|
|
|
def brick_get_connector(protocol, driver=None,
|
|
execute=processutils.execute,
|
|
use_multipath=False,
|
|
device_scan_attempts=3,
|
|
*args, **kwargs):
|
|
"""Wrapper to get a brick connector object.
|
|
This automatically populates the required protocol as well
|
|
as the root_helper needed to execute commands.
|
|
"""
|
|
|
|
root_helper = get_root_helper()
|
|
return connector.InitiatorConnector.factory(protocol, root_helper,
|
|
driver=driver,
|
|
execute=execute,
|
|
use_multipath=use_multipath,
|
|
device_scan_attempts=
|
|
device_scan_attempts,
|
|
*args, **kwargs)
|
|
|
|
|
|
def require_driver_initialized(func):
|
|
@functools.wraps(func)
|
|
def wrapper(self, *args, **kwargs):
|
|
# we can't do anything if the driver didn't init
|
|
if not self.driver.initialized:
|
|
driver_name = self.driver.__class__.__name__
|
|
raise exception.DriverNotInitialized(driver=driver_name)
|
|
return func(self, *args, **kwargs)
|
|
return wrapper
|