54d04d4fe1
This patch updates hacking and bandit versions to match what neutron and others are doing. It also fixes and ignores some new pep8 errors that crop up due to the version bump. Finally the doc requirements are moved to doc/requirements.txt to match what other projects do, even though this project does not build docs today. Change-Id: Ibe07dbdbaccc220b5ea2a628d342a09a01b09d11
707 lines
26 KiB
Python
707 lines
26 KiB
Python
# Copyright 2015 VMware, Inc.
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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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#
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import abc
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import contextlib
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import copy
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import datetime
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import inspect
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import itertools
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import logging
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import re
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import eventlet
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from eventlet import greenpool
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from eventlet import pools
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import OpenSSL
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from oslo_log import log
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from oslo_service import loopingcall
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import requests
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from requests import adapters
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from requests import exceptions as requests_exceptions
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import six
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import six.moves.urllib.parse as urlparse
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import tenacity
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import urllib3
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from vmware_nsxlib._i18n import _
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from vmware_nsxlib.v3 import client as nsx_client
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from vmware_nsxlib.v3 import exceptions
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from vmware_nsxlib.v3 import utils
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LOG = log.getLogger(__name__)
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# disable warning message for each HTTP retry
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logging.getLogger(
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"urllib3.connectionpool").setLevel(logging.ERROR)
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# Hide the InsecureRequestWarning from urllib3
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urllib3.disable_warnings(urllib3.exceptions.InsecureRequestWarning)
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@six.add_metaclass(abc.ABCMeta)
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class AbstractHTTPProvider(object):
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"""Interface for providers of HTTP connections.
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which are responsible for creating and validating connections
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for their underlying HTTP support.
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"""
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@property
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def default_scheme(self):
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return 'https'
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@abc.abstractproperty
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def provider_id(self):
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"""A unique string name for this provider."""
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pass
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@abc.abstractmethod
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def validate_connection(self, cluster_api, endpoint, conn):
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"""Validate the said connection for the given endpoint and cluster."""
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pass
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@abc.abstractmethod
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def new_connection(self, cluster_api, provider):
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"""Create a new http connection.
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Create a new http connection for the said cluster and
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cluster provider. The actual connection should duck type
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requests.Session http methods (get(), put(), etc.).
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"""
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pass
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@abc.abstractmethod
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def is_connection_exception(self, exception):
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"""Determine if the given exception is related to connection failure.
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Return True if it's a connection exception and False otherwise.
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"""
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@abc.abstractmethod
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def is_timeout_exception(self, exception):
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"""Determine if the given exception is related to timeout.
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Return True if it's a timeout exception and False otherwise.
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"""
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class TimeoutSession(requests.Session):
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"""Extends requests.Session to support timeout at the session level."""
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def __init__(self, timeout, read_timeout):
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self.timeout = timeout
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self.read_timeout = read_timeout
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self.cert_provider = None
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super(TimeoutSession, self).__init__()
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@property
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def cert_provider(self):
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return self._cert_provider
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@cert_provider.setter
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def cert_provider(self, value):
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self._cert_provider = value
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# wrapper timeouts at the session level
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# see: https://goo.gl/xNk7aM
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def request(self, *args, **kwargs):
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def request_with_retry_on_ssl_error(*args, **kwargs):
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try:
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return super(TimeoutSession, self).request(*args, **kwargs)
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except (IOError, OpenSSL.SSL.Error):
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# This can happen when connection tries to access certificate
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# file it was opened with (renegotiation?)
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# Proper way to solve this would be to pass in-memory cert
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# to ssl C code.
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# Retrying here works around the problem
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return super(TimeoutSession, self).request(*args, **kwargs)
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def get_cert_provider():
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if inspect.isclass(self._cert_provider):
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# If client provided certificate provider as a class,
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# we spawn an instance here
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return self._cert_provider()
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return self._cert_provider
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if 'timeout' not in kwargs:
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kwargs['timeout'] = (self.timeout, self.read_timeout)
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if not self.cert_provider:
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# No client certificate needed
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return super(TimeoutSession, self).request(*args, **kwargs)
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if self.cert is not None:
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# Recursive call - shouldn't happen
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return request_with_retry_on_ssl_error(*args, **kwargs)
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# The following with statement allows for preparing certificate and
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# private key file and dispose it at the end of request
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# (since PK is sensitive information, immediate disposal is
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# important).
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# It would be optimal to populate certificate once per connection,
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# per request. Unfortunately requests library verifies cert file
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# existence regardless of whether certificate is going to be used
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# for this request.
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# Optimal solution for this would be to expose certificate as variable
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# and not as a file to the SSL library
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with get_cert_provider() as provider:
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self.cert = provider.filename()
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try:
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ret = request_with_retry_on_ssl_error(*args, **kwargs)
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except Exception as e:
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self.cert = None
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raise e
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self.cert = None
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return ret
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class NSXRequestsHTTPProvider(AbstractHTTPProvider):
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"""Concrete implementation of AbstractHTTPProvider.
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using requests.Session() as the underlying connection.
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"""
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SESSION_CREATE_URL = '/api/session/create'
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COOKIE_FIELD = 'Cookie'
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SET_COOKIE_FIELD = 'Set-Cookie'
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XSRF_TOKEN = 'X-XSRF-TOKEN'
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JSESSIONID = 'JSESSIONID'
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@property
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def provider_id(self):
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return "%s-%s" % (requests.__title__, requests.__version__)
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def validate_connection(self, cluster_api, endpoint, conn):
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client = nsx_client.NSX3Client(
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conn, url_prefix=endpoint.provider.url,
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url_path_base=cluster_api.nsxlib_config.url_base,
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default_headers=conn.default_headers)
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# Check the manager state directly
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if cluster_api.nsxlib_config.validate_connection_method:
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cluster_api.nsxlib_config.validate_connection_method(
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client, endpoint.provider.url)
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# If keeplive section returns a list, it is assumed to be non-empty
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keepalive_section = cluster_api.nsxlib_config.keepalive_section
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result = client.get(keepalive_section, silent=True)
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if not result or result.get('result_count', 1) <= 0:
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msg = _("No %(section)s found "
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"for '%(url)s'") % {'section': keepalive_section,
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'url': endpoint.provider.url}
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LOG.warning(msg)
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raise exceptions.ResourceNotFound(
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manager=endpoint.provider.url, operation=msg)
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def new_connection(self, cluster_api, provider):
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config = cluster_api.nsxlib_config
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session = TimeoutSession(config.http_timeout,
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config.http_read_timeout)
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if config.client_cert_provider:
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session.cert_provider = config.client_cert_provider
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else:
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session.auth = (provider.username, provider.password)
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# NSX v3 doesn't use redirects
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session.max_redirects = 0
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session.verify = not config.insecure
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if session.verify and provider.ca_file:
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# verify using the said ca bundle path
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session.verify = provider.ca_file
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# we are pooling with eventlet in the cluster class
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adapter = adapters.HTTPAdapter(
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pool_connections=1, pool_maxsize=1,
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max_retries=config.retries,
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pool_block=False)
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session.mount('http://', adapter)
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session.mount('https://', adapter)
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self.get_default_headers(session, provider,
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config.allow_overwrite_header)
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return session
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def is_connection_exception(self, exception):
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return isinstance(exception, requests_exceptions.ConnectionError)
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def is_timeout_exception(self, exception):
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return isinstance(exception, requests_exceptions.Timeout)
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def is_conn_open_exception(self, exception):
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return isinstance(exception, requests_exceptions.ConnectTimeout)
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def get_default_headers(self, session, provider, allow_overwrite_header):
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"""Get the default headers that should be added to future requests"""
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session.default_headers = {}
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# Perform the initial session create and get the relevant jsessionid &
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# X-XSRF-TOKEN for future requests
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req_data = ''
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if not session.cert_provider:
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# With client certificate authentication, username and password
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# may not be provided.
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# If provided, backend treats these credentials as authentication
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# and ignores client cert as principal identity indication.
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req_data = 'j_username=%s&j_password=%s' % (provider.username,
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provider.password)
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req_headers = {'Accept': 'application/json',
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'Content-Type': 'application/x-www-form-urlencoded'}
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# Cannot use the certificate at this stage, because it is used for
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# the certificate generation
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try:
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resp = session.request(
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'post', provider.url + self.SESSION_CREATE_URL,
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data=req_data, headers=req_headers)
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except Exception as e:
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# Error 403 might be because the backend does not support this for
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# all versions.
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LOG.warning("Session create failed for endpoint %s with error %s",
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provider.url, e)
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else:
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if resp.status_code != 200 and resp.status_code != 201:
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LOG.warning("Session create failed for endpoint %s with "
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"response %s",
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provider.url, resp.status_code)
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# this may will later cause the endpoint to be Down
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else:
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for header_name in resp.headers:
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if self.SET_COOKIE_FIELD.lower() == header_name.lower():
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m = re.match('%s=.*?\;' % self.JSESSIONID, # noqa
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resp.headers[header_name])
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if m:
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session.default_headers[self.COOKIE_FIELD] = (
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m.group())
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if self.XSRF_TOKEN.lower() == header_name.lower():
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session.default_headers[self.XSRF_TOKEN] = (
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resp.headers[header_name])
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LOG.info("Session create succeeded for endpoint %(url)s with "
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"headers %(hdr)s",
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{'url': provider.url, 'hdr': session.default_headers})
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# Add allow-overwrite if configured
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if allow_overwrite_header:
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session.default_headers['X-Allow-Overwrite'] = 'true'
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class ClusterHealth(object):
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"""Indicator of overall cluster health.
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with respect to the connectivity of the clusters managed endpoints.
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"""
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# all endpoints are UP
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GREEN = 'GREEN'
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# at least 1 endpoint is UP, but 1 or more are DOWN
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ORANGE = 'ORANGE'
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# all endpoints are DOWN
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RED = 'RED'
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class EndpointState(object):
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"""Tracks the connectivity state for a said endpoint."""
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# no UP or DOWN state recorded yet
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INITIALIZED = 'INITIALIZED'
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# endpoint has been validate and is good
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UP = 'UP'
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# endpoint can't be reached or validated
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DOWN = 'DOWN'
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class Provider(object):
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"""Data holder for a provider
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Which has a unique id a connection URL, and the credential details.
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"""
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def __init__(self, provider_id, provider_url, username, password, ca_file):
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self.id = provider_id
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self.url = provider_url
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self.username = username
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self.password = password
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self.ca_file = ca_file
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def __str__(self):
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return str(self.url)
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class Endpoint(object):
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"""A single NSX manager endpoint (host).
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A single NSX manager endpoint (host) which includes
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related information such as the endpoint's provider,
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state, etc.. A pool is used to hold connections to the
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endpoint which are doled out when proxying HTTP methods
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to the underlying connections.
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"""
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def __init__(self, provider, pool):
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self.provider = provider
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self.pool = pool
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self._state = EndpointState.INITIALIZED
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self._last_updated = datetime.datetime.now()
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def regenerate_pool(self):
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self.pool = pools.Pool(min_size=self.pool.min_size,
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max_size=self.pool.max_size,
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order_as_stack=True,
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create=self.pool.create)
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@property
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def last_updated(self):
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return self._last_updated
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@property
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def state(self):
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return self._state
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def set_state(self, state):
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if self.state != state:
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LOG.info("Endpoint '%(ep)s' changing from state"
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" '%(old)s' to '%(new)s'",
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{'ep': self.provider,
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'old': self.state,
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'new': state})
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old_state = self._state
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self._state = state
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self._last_updated = datetime.datetime.now()
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return old_state
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def __str__(self):
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return "[%s] %s" % (self.state, self.provider)
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class EndpointConnection(object):
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"""Simple data holder
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Which contains an endpoint and a connection for that endpoint.
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"""
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def __init__(self, endpoint, connection):
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self.endpoint = endpoint
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self.connection = connection
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class ClusteredAPI(object):
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"""Duck types the major HTTP based methods of a requests.Session
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Such as get(), put(), post(), etc.
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and transparently proxies those calls to one of
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its managed NSX manager endpoints.
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"""
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_HTTP_VERBS = ['get', 'delete', 'head', 'put', 'post', 'patch', 'create']
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def __init__(self, providers,
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http_provider,
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min_conns_per_pool=0,
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max_conns_per_pool=20,
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keepalive_interval=33):
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self._http_provider = http_provider
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self._keepalive_interval = keepalive_interval
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def _init_cluster(*args, **kwargs):
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self._init_endpoints(providers,
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min_conns_per_pool, max_conns_per_pool)
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_init_cluster()
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# keep this internal method for reinitialize upon fork
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# for api workers to ensure each process has its own keepalive
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# loops + state
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self._reinit_cluster = _init_cluster
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def _init_endpoints(self, providers,
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min_conns_per_pool, max_conns_per_pool):
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LOG.debug("Initializing API endpoints")
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def _create_conn(p):
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def _conn():
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return self._http_provider.new_connection(self, p)
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return _conn
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self._endpoints = {}
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for provider in providers:
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pool = pools.Pool(
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min_size=min_conns_per_pool,
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max_size=max_conns_per_pool,
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order_as_stack=True,
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create=_create_conn(provider))
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endpoint = Endpoint(provider, pool)
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self._endpoints[provider.id] = endpoint
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# service requests using round robin
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self._endpoint_schedule = itertools.cycle(self._endpoints.values())
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# duck type to proxy http invocations
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for method in ClusteredAPI._HTTP_VERBS:
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setattr(self, method, self._proxy_stub(method))
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conns = greenpool.GreenPool()
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for endpoint in self._endpoints.values():
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conns.spawn(self._validate, endpoint)
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eventlet.sleep(0)
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while conns.running():
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if (self.health == ClusterHealth.GREEN or
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self.health == ClusterHealth.ORANGE):
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# only wait for 1 or more endpoints to reduce init time
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break
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eventlet.sleep(0.5)
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for endpoint in self._endpoints.values():
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# dynamic loop for each endpoint to ensure connectivity
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loop = loopingcall.DynamicLoopingCall(
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self._endpoint_keepalive, endpoint)
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loop.start(initial_delay=self._keepalive_interval,
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periodic_interval_max=self._keepalive_interval,
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stop_on_exception=False)
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LOG.debug("Done initializing API endpoint(s). "
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"API cluster health: %s", self.health)
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def _endpoint_keepalive(self, endpoint):
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delta = datetime.datetime.now() - endpoint.last_updated
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if delta.seconds >= self._keepalive_interval:
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# TODO(boden): backoff on validation failure
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self._validate(endpoint)
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return self._keepalive_interval
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return self._keepalive_interval - delta.seconds
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@property
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def providers(self):
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return [ep.provider for ep in self._endpoints.values()]
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@property
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def endpoints(self):
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return copy.copy(self._endpoints)
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@property
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def http_provider(self):
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return self._http_provider
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@property
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def health(self):
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down = 0
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up = 0
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for endpoint in self._endpoints.values():
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if endpoint.state != EndpointState.UP:
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down += 1
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else:
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up += 1
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if down == len(self._endpoints):
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return ClusterHealth.RED
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return (ClusterHealth.GREEN
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if up == len(self._endpoints)
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else ClusterHealth.ORANGE)
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def _validate(self, endpoint):
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try:
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with endpoint.pool.item() as conn:
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self._http_provider.validate_connection(self, endpoint, conn)
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endpoint.set_state(EndpointState.UP)
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except exceptions.ClientCertificateNotTrusted:
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LOG.warning("Failed to validate API cluster endpoint "
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"'%(ep)s' due to untrusted client certificate",
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{'ep': endpoint})
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# regenerate connection pool based on new certificate
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endpoint.regenerate_pool()
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except exceptions.BadXSRFToken:
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LOG.warning("Failed to validate API cluster endpoint "
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"'%(ep)s' due to expired XSRF token",
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{'ep': endpoint})
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# regenerate connection pool based on token
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endpoint.regenerate_pool()
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except Exception as e:
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endpoint.set_state(EndpointState.DOWN)
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LOG.warning("Failed to validate API cluster endpoint "
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"'%(ep)s' due to: %(err)s",
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{'ep': endpoint, 'err': e})
|
|
|
|
def _select_endpoint(self):
|
|
"""Return an endpoint in UP state.
|
|
|
|
Go over all endpoint and return the next one which is UP
|
|
If all endpoints are currently DOWN, depending on the configuration
|
|
retry it until one is UP (or max retries exceeded)
|
|
"""
|
|
def _select_endpoint_internal(refresh=False):
|
|
# check for UP state until exhausting all endpoints
|
|
seen, total = 0, len(self._endpoints.values())
|
|
while seen < total:
|
|
endpoint = next(self._endpoint_schedule)
|
|
if refresh:
|
|
self._validate(endpoint)
|
|
if endpoint.state == EndpointState.UP:
|
|
return endpoint
|
|
seen += 1
|
|
|
|
@utils.retry_upon_none_result(self.nsxlib_config.max_attempts)
|
|
def _select_endpoint_internal_with_retry():
|
|
# redo endpoint selection with refreshing states
|
|
return _select_endpoint_internal(refresh=True)
|
|
|
|
# First attempt to get an UP endpoint
|
|
endpoint = _select_endpoint_internal()
|
|
if endpoint or not self.nsxlib_config.cluster_unavailable_retry:
|
|
return endpoint
|
|
|
|
# Retry the selection while refreshing the endpoints state
|
|
try:
|
|
return _select_endpoint_internal_with_retry()
|
|
except tenacity.RetryError:
|
|
# exhausted number of retries
|
|
return None
|
|
|
|
def endpoint_for_connection(self, conn):
|
|
# check all endpoint pools
|
|
for endpoint in self._endpoints.values():
|
|
if (conn in endpoint.pool.channel.queue or
|
|
conn in endpoint.pool.free_items):
|
|
return endpoint
|
|
|
|
@property
|
|
def cluster_id(self):
|
|
return ','.join([str(ep.provider.url)
|
|
for ep in self._endpoints.values()])
|
|
|
|
@contextlib.contextmanager
|
|
def connection(self):
|
|
with self.endpoint_connection() as conn_data:
|
|
yield conn_data.connection
|
|
|
|
@contextlib.contextmanager
|
|
def endpoint_connection(self):
|
|
endpoint = self._select_endpoint()
|
|
if not endpoint:
|
|
LOG.debug("All endpoints down for: %s" %
|
|
[str(ep) for ep in self._endpoints.values()])
|
|
# all endpoints are DOWN and will have their next
|
|
# state updated as per _endpoint_keepalive()
|
|
raise exceptions.ServiceClusterUnavailable(
|
|
cluster_id=self.cluster_id)
|
|
|
|
if endpoint.pool.free() == 0:
|
|
LOG.info("API endpoint %(ep)s at connection "
|
|
"capacity %(max)s and has %(waiting)s waiting",
|
|
{'ep': endpoint,
|
|
'max': endpoint.pool.max_size,
|
|
'waiting': endpoint.pool.waiting()})
|
|
# pool.item() will wait if pool has 0 free
|
|
with endpoint.pool.item() as conn:
|
|
yield EndpointConnection(endpoint, conn)
|
|
|
|
def _proxy_stub(self, proxy_for):
|
|
def _call_proxy(url, *args, **kwargs):
|
|
return self._proxy(proxy_for, url, *args, **kwargs)
|
|
return _call_proxy
|
|
|
|
def _proxy(self, proxy_for, uri, *args, **kwargs):
|
|
# proxy http request call to an avail endpoint
|
|
with self.endpoint_connection() as conn_data:
|
|
conn = conn_data.connection
|
|
endpoint = conn_data.endpoint
|
|
|
|
# http conn must support requests style interface
|
|
do_request = getattr(conn, proxy_for)
|
|
|
|
if not uri.startswith('/'):
|
|
uri = "/%s" % uri
|
|
url = "%s%s" % (endpoint.provider.url, uri)
|
|
try:
|
|
LOG.debug("API cluster proxy %s %s to %s",
|
|
proxy_for.upper(), uri, url)
|
|
# Add the connection default headers
|
|
if conn.default_headers:
|
|
kwargs['headers'] = kwargs.get('headers', {})
|
|
kwargs['headers'].update(conn.default_headers)
|
|
|
|
# call the actual connection method to do the
|
|
# http request/response over the wire
|
|
response = do_request(url, *args, **kwargs)
|
|
endpoint.set_state(EndpointState.UP)
|
|
|
|
return response
|
|
except Exception as e:
|
|
LOG.warning("Request failed due to: %s", e)
|
|
if (not self._http_provider.is_connection_exception(e) and
|
|
not self._http_provider.is_timeout_exception(e)):
|
|
# only trap and retry connection & timeout errors
|
|
raise e
|
|
if self._http_provider.is_conn_open_exception(e):
|
|
# unable to establish new connection - endpoint is
|
|
# inaccessible
|
|
endpoint.set_state(EndpointState.DOWN)
|
|
|
|
LOG.debug("Connection to %s failed, checking additional "
|
|
"connections and endpoints" % url)
|
|
# this might be a result of server closing connection
|
|
# retry until exhausting connections and endpoints
|
|
return self._proxy(proxy_for, uri, *args, **kwargs)
|
|
|
|
|
|
class NSXClusteredAPI(ClusteredAPI):
|
|
"""Extends ClusteredAPI to get conf values and setup the NSXv3 cluster."""
|
|
|
|
def __init__(self, nsxlib_config):
|
|
self.nsxlib_config = nsxlib_config
|
|
|
|
self._http_provider = (nsxlib_config.http_provider or
|
|
NSXRequestsHTTPProvider())
|
|
|
|
super(NSXClusteredAPI, self).__init__(
|
|
self._build_conf_providers(),
|
|
self._http_provider,
|
|
max_conns_per_pool=self.nsxlib_config.concurrent_connections,
|
|
keepalive_interval=self.nsxlib_config.conn_idle_timeout)
|
|
|
|
LOG.debug("Created NSX clustered API with '%s' "
|
|
"provider", self._http_provider.provider_id)
|
|
|
|
def _build_conf_providers(self):
|
|
|
|
def _schemed_url(uri):
|
|
uri = uri.strip('/')
|
|
return urlparse.urlparse(
|
|
uri if uri.startswith('http') else
|
|
"%s://%s" % (self._http_provider.default_scheme, uri))
|
|
|
|
conf_urls = self.nsxlib_config.nsx_api_managers[:]
|
|
urls = []
|
|
providers = []
|
|
provider_index = -1
|
|
for conf_url in conf_urls:
|
|
provider_index += 1
|
|
conf_url = _schemed_url(conf_url)
|
|
if conf_url in urls:
|
|
LOG.warning("'%s' already defined in configuration file. "
|
|
"Skipping.", urlparse.urlunparse(conf_url))
|
|
continue
|
|
urls.append(conf_url)
|
|
providers.append(
|
|
Provider(
|
|
conf_url.netloc,
|
|
urlparse.urlunparse(conf_url),
|
|
self.nsxlib_config.username(provider_index),
|
|
self.nsxlib_config.password(provider_index),
|
|
self.nsxlib_config.ca_file(provider_index)))
|
|
return providers
|