523 lines
16 KiB
Python
523 lines
16 KiB
Python
# Copyright 2010 United States Government as represented by the
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# Administrator of the National Aeronautics and Space Administration.
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# Copyright 2011 Justin Santa Barbara
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# All Rights Reserved.
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#
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# Licensed under the Apache License, Version 2.0 (the "License"); you may
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# not use this file except in compliance with the License. You may obtain
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# a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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# License for the specific language governing permissions and limitations
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# under the License.
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"""Utilities and helper functions."""
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import contextlib
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import errno
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import inspect
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import os
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import pyclbr
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import shutil
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import socket
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import sys
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import tempfile
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from xml.dom import minidom
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from xml.parsers import expat
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from xml import sax
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from xml.sax import expatreader
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from eventlet import pools
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import netaddr
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from oslo_concurrency import lockutils
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from oslo_concurrency import processutils
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from oslo_config import cfg
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from oslo_log import log
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from oslo_utils import importutils
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from oslo_utils import timeutils
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import paramiko
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import six
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from manila.db import api as db_api
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from manila import exception
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from manila.i18n import _
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CONF = cfg.CONF
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LOG = log.getLogger(__name__)
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synchronized = lockutils.synchronized_with_prefix('manila-')
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def _get_root_helper():
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return 'sudo manila-rootwrap %s' % CONF.rootwrap_config
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def execute(*cmd, **kwargs):
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"""Convenience wrapper around oslo's execute() function."""
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if 'run_as_root' in kwargs and 'root_helper' not in kwargs:
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kwargs['root_helper'] = _get_root_helper()
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return processutils.execute(*cmd, **kwargs)
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def trycmd(*args, **kwargs):
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"""Convenience wrapper around oslo's trycmd() function."""
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if 'run_as_root' in kwargs and 'root_helper' not in kwargs:
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kwargs['root_helper'] = _get_root_helper()
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return processutils.trycmd(*args, **kwargs)
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class SSHPool(pools.Pool):
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"""A simple eventlet pool to hold ssh connections."""
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def __init__(self, ip, port, conn_timeout, login, password=None,
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privatekey=None, *args, **kwargs):
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self.ip = ip
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self.port = port
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self.login = login
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self.password = password
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self.conn_timeout = conn_timeout if conn_timeout else None
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self.path_to_private_key = privatekey
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super(SSHPool, self).__init__(*args, **kwargs)
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def create(self):
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ssh = paramiko.SSHClient()
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ssh.set_missing_host_key_policy(paramiko.AutoAddPolicy())
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look_for_keys = True
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if self.path_to_private_key:
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self.path_to_private_key = os.path.expanduser(
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self.path_to_private_key)
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look_for_keys = False
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elif self.password:
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look_for_keys = False
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try:
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ssh.connect(self.ip,
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port=self.port,
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username=self.login,
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password=self.password,
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key_filename=self.path_to_private_key,
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look_for_keys=look_for_keys,
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timeout=self.conn_timeout)
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# Paramiko by default sets the socket timeout to 0.1 seconds,
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# ignoring what we set thru the sshclient. This doesn't help for
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# keeping long lived connections. Hence we have to bypass it, by
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# overriding it after the transport is initialized. We are setting
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# the sockettimeout to None and setting a keepalive packet so that,
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# the server will keep the connection open. All that does is send
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# a keepalive packet every ssh_conn_timeout seconds.
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if self.conn_timeout:
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transport = ssh.get_transport()
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transport.sock.settimeout(None)
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transport.set_keepalive(self.conn_timeout)
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return ssh
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except Exception as e:
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msg = _("Check whether private key or password are correctly "
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"set. Error connecting via ssh: %s") % e
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LOG.error(msg)
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raise exception.SSHException(msg)
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def get(self):
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"""Return an item from the pool, when one is available.
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This may cause the calling greenthread to block. Check if a
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connection is active before returning it. For dead connections
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create and return a new connection.
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"""
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if self.free_items:
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conn = self.free_items.popleft()
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if conn:
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if conn.get_transport().is_active():
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return conn
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else:
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conn.close()
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return self.create()
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if self.current_size < self.max_size:
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created = self.create()
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self.current_size += 1
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return created
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return self.channel.get()
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def remove(self, ssh):
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"""Close an ssh client and remove it from free_items."""
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ssh.close()
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ssh = None
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if ssh in self.free_items:
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self.free_items.pop(ssh)
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if self.current_size > 0:
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self.current_size -= 1
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def maniladir():
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import manila
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return os.path.abspath(manila.__file__).split('manila/__init__.py')[0]
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def debug(arg):
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LOG.debug('debug in callback: %s', arg)
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return arg
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class LazyPluggable(object):
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"""A pluggable backend loaded lazily based on some value."""
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def __init__(self, pivot, **backends):
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self.__backends = backends
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self.__pivot = pivot
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self.__backend = None
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def __get_backend(self):
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if not self.__backend:
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backend_name = CONF[self.__pivot]
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if backend_name not in self.__backends:
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raise exception.Error(_('Invalid backend: %s') % backend_name)
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backend = self.__backends[backend_name]
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if isinstance(backend, tuple):
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name = backend[0]
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fromlist = backend[1]
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else:
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name = backend
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fromlist = backend
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self.__backend = __import__(name, None, None, fromlist)
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LOG.debug('backend %s', self.__backend)
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return self.__backend
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def __getattr__(self, key):
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backend = self.__get_backend()
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return getattr(backend, key)
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class ProtectedExpatParser(expatreader.ExpatParser):
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"""An expat parser which disables DTD's and entities by default."""
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def __init__(self, forbid_dtd=True, forbid_entities=True,
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*args, **kwargs):
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# Python 2.x old style class
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expatreader.ExpatParser.__init__(self, *args, **kwargs)
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self.forbid_dtd = forbid_dtd
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self.forbid_entities = forbid_entities
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def start_doctype_decl(self, name, sysid, pubid, has_internal_subset):
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raise ValueError("Inline DTD forbidden")
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def entity_decl(self, entityName, is_parameter_entity, value, base,
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systemId, publicId, notationName):
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raise ValueError("<!ENTITY> forbidden")
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def unparsed_entity_decl(self, name, base, sysid, pubid, notation_name):
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# expat 1.2
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raise ValueError("<!ENTITY> forbidden")
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def reset(self):
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expatreader.ExpatParser.reset(self)
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if self.forbid_dtd:
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self._parser.StartDoctypeDeclHandler = self.start_doctype_decl
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if self.forbid_entities:
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self._parser.EntityDeclHandler = self.entity_decl
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self._parser.UnparsedEntityDeclHandler = self.unparsed_entity_decl
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def safe_minidom_parse_string(xml_string):
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"""Parse an XML string using minidom safely.
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"""
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try:
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return minidom.parseString(xml_string, parser=ProtectedExpatParser())
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except sax.SAXParseException:
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raise expat.ExpatError()
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def delete_if_exists(pathname):
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"""Delete a file, but ignore file not found error."""
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try:
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os.unlink(pathname)
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except OSError as e:
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if e.errno == errno.ENOENT:
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return
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else:
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raise
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def get_from_path(items, path):
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"""Returns a list of items matching the specified path.
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Takes an XPath-like expression e.g. prop1/prop2/prop3, and for each item
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in items, looks up items[prop1][prop2][prop3]. Like XPath, if any of the
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intermediate results are lists it will treat each list item individually.
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A 'None' in items or any child expressions will be ignored, this function
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will not throw because of None (anywhere) in items. The returned list
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will contain no None values.
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"""
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if path is None:
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raise exception.Error('Invalid mini_xpath')
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(first_token, sep, remainder) = path.partition('/')
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if first_token == '':
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raise exception.Error('Invalid mini_xpath')
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results = []
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if items is None:
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return results
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if not isinstance(items, list):
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# Wrap single objects in a list
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items = [items]
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for item in items:
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if item is None:
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continue
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get_method = getattr(item, 'get', None)
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if get_method is None:
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continue
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child = get_method(first_token)
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if child is None:
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continue
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if isinstance(child, list):
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# Flatten intermediate lists
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for x in child:
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results.append(x)
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else:
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results.append(child)
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if not sep:
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# No more tokens
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return results
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else:
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return get_from_path(results, remainder)
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def is_ipv6_configured():
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"""Check if system contain IPv6 capable network interface.
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:rtype: bool
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:raises: IOError
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"""
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try:
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fd = open('/proc/net/if_inet6')
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except IOError as e:
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if e.errno != errno.ENOENT:
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raise
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result = False
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else:
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result = bool(fd.read(32))
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fd.close()
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return result
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def is_eventlet_bug105():
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"""Check if eventlet support IPv6 addresses.
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See https://bitbucket.org/eventlet/eventlet/issue/105
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:rtype: bool
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"""
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try:
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mod = sys.modules['eventlet.support.greendns']
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except KeyError:
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return False
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try:
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connect_data = mod.getaddrinfo('::1', 80)
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except socket.gaierror:
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return True
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fail = [x for x in connect_data if x[0] != socket.AF_INET6]
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return bool(fail)
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def monkey_patch():
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"""Patch decorator.
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If the Flags.monkey_patch set as True,
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this function patches a decorator
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for all functions in specified modules.
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You can set decorators for each modules
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using CONF.monkey_patch_modules.
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The format is "Module path:Decorator function".
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Example: 'manila.api.ec2.cloud:' \
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manila.openstack.common.notifier.api.notify_decorator'
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Parameters of the decorator is as follows.
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(See manila.openstack.common.notifier.api.notify_decorator)
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name - name of the function
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function - object of the function
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"""
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# If CONF.monkey_patch is not True, this function do nothing.
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if not CONF.monkey_patch:
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return
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# Get list of modules and decorators
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for module_and_decorator in CONF.monkey_patch_modules:
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module, decorator_name = module_and_decorator.split(':')
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# import decorator function
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decorator = importutils.import_class(decorator_name)
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__import__(module)
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# Retrieve module information using pyclbr
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module_data = pyclbr.readmodule_ex(module)
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for key in module_data.keys():
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# set the decorator for the class methods
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if isinstance(module_data[key], pyclbr.Class):
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clz = importutils.import_class("%s.%s" % (module, key))
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for method, func in inspect.getmembers(clz, inspect.ismethod):
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setattr(
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clz, method,
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decorator("%s.%s.%s" % (module, key, method), func))
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# set the decorator for the function
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if isinstance(module_data[key], pyclbr.Function):
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func = importutils.import_class("%s.%s" % (module, key))
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setattr(sys.modules[module], key,
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decorator("%s.%s" % (module, key), func))
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def read_cached_file(filename, cache_info, reload_func=None):
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"""Read from a file if it has been modified.
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:param cache_info: dictionary to hold opaque cache.
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:param reload_func: optional function to be called with data when
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file is reloaded due to a modification.
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:returns: data from file
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"""
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mtime = os.path.getmtime(filename)
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if not cache_info or mtime != cache_info.get('mtime'):
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with open(filename) as fap:
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cache_info['data'] = fap.read()
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cache_info['mtime'] = mtime
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if reload_func:
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reload_func(cache_info['data'])
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return cache_info['data']
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def file_open(*args, **kwargs):
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"""Open file
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see built-in file() documentation for more details
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Note: The reason this is kept in a separate module is to easily
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be able to provide a stub module that doesn't alter system
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state at all (for unit tests)
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"""
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return file(*args, **kwargs)
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def service_is_up(service):
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"""Check whether a service is up based on last heartbeat."""
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last_heartbeat = service['updated_at'] or service['created_at']
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# Timestamps in DB are UTC.
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elapsed = timeutils.total_seconds(timeutils.utcnow() - last_heartbeat)
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return abs(elapsed) <= CONF.service_down_time
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def validate_service_host(context, host):
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service = db_api.service_get_by_host_and_topic(context, host,
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'manila-share')
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if not service_is_up(service):
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raise exception.ServiceIsDown(service=service['host'])
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return service
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def read_file_as_root(file_path):
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"""Secure helper to read file as root."""
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try:
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out, _err = execute('cat', file_path, run_as_root=True)
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return out
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except exception.ProcessExecutionError:
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raise exception.FileNotFound(file_path=file_path)
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@contextlib.contextmanager
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def temporary_chown(path, owner_uid=None):
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"""Temporarily chown a path.
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:params owner_uid: UID of temporary owner (defaults to current user)
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"""
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if owner_uid is None:
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owner_uid = os.getuid()
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orig_uid = os.stat(path).st_uid
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if orig_uid != owner_uid:
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execute('chown', owner_uid, path, run_as_root=True)
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try:
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yield
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finally:
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if orig_uid != owner_uid:
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execute('chown', orig_uid, path, run_as_root=True)
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@contextlib.contextmanager
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def tempdir(**kwargs):
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tmpdir = tempfile.mkdtemp(**kwargs)
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try:
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yield tmpdir
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finally:
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try:
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shutil.rmtree(tmpdir)
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except OSError as e:
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LOG.debug('Could not remove tmpdir: %s', six.text_type(e))
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def walk_class_hierarchy(clazz, encountered=None):
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"""Walk class hierarchy, yielding most derived classes first."""
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if not encountered:
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encountered = []
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for subclass in clazz.__subclasses__():
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if subclass not in encountered:
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encountered.append(subclass)
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# drill down to leaves first
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for subsubclass in walk_class_hierarchy(subclass, encountered):
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yield subsubclass
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yield subclass
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def ensure_tree(path):
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"""Create a directory (and any ancestor directories required)
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:param path: Directory to create
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"""
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try:
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os.makedirs(path)
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except OSError as exc:
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if exc.errno == errno.EEXIST:
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if not os.path.isdir(path):
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raise
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else:
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raise
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def cidr_to_netmask(cidr):
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"""Convert cidr to netmask."""
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try:
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network = netaddr.IPNetwork(cidr)
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return str(network.netmask)
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except netaddr.AddrFormatError:
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raise exception.InvalidInput(_("Invalid cidr supplied %s") % cidr)
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def is_valid_ip_address(ip_address, ip_version):
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if int(ip_version) == 4:
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return netaddr.valid_ipv4(ip_address)
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elif int(ip_version) == 6:
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return netaddr.valid_ipv6(ip_address)
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else:
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raise exception.ManilaException(
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_("Provided improper IP version '%s'.") % ip_version)
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class IsAMatcher(object):
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def __init__(self, expected_value=None):
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self.expected_value = expected_value
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def __eq__(self, actual_value):
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return isinstance(actual_value, self.expected_value)
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