145 lines
5.3 KiB
Python
145 lines
5.3 KiB
Python
# Copyright 2017 AT&T Intellectual Property. All other rights reserved.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain 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,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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"""Module for resolving design references."""
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import urllib.parse
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import re
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import time
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import logging
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import requests
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from beaker.cache import CacheManager
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from beaker.util import parse_cache_config_options
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from drydock_provisioner import error as errors
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from drydock_provisioner.util import KeystoneUtils
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from drydock_provisioner.config import config_mgr
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cache_opts = {
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'cache.type': 'memory',
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'expire': 300,
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}
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cache = CacheManager(**parse_cache_config_options(cache_opts))
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LOG = logging.getLogger(__name__)
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class ReferenceResolver(object):
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"""Class for handling different data references to resolve them data."""
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@classmethod
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@cache.cache()
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def resolve_reference(cls, design_ref):
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"""Resolve a reference to a design document.
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Locate a schema handler based on the URI scheme of the data reference
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and use that handler to get the data referenced.
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:param design_ref: A URI-formatted reference to a data entity
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"""
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try:
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design_uri = urllib.parse.urlparse(design_ref)
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handler = cls.scheme_handlers.get(design_uri.scheme, None)
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if handler is None:
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raise errors.InvalidDesignReference(
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"Invalid reference scheme %s: no handler." %
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design_uri.scheme)
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else:
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tries = 0
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while tries < config_mgr.conf.network.http_client_retries:
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try:
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# Have to do a little magic to call the classmethod as a pointer
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return handler.__get__(None, cls)(design_uri)
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except Exception as ex:
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tries = tries + 1
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if tries < config_mgr.conf.network.http_client_retries:
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LOG.debug("Retrying reference after failure: %s" %
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str(ex))
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time.sleep(5**tries)
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except ValueError:
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raise errors.InvalidDesignReference(
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"Cannot resolve design reference %s: unable to parse as valid URI."
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% design_ref)
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@classmethod
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def resolve_reference_http(cls, design_uri):
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"""Retrieve design documents from http/https endpoints.
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Return a byte array of the response content. Support unsecured or
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basic auth
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:param design_uri: Tuple as returned by urllib.parse for the design reference
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"""
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if design_uri.username is not None and design_uri.password is not None:
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response = requests.get(
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design_uri.geturl(),
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auth=(design_uri.username, design_uri.password),
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timeout=get_client_timeouts())
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else:
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response = requests.get(
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design_uri.geturl(), timeout=get_client_timeouts())
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return response.content
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@classmethod
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def resolve_reference_file(cls, design_uri):
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"""Retrieve design documents from local file endpoints.
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Return a byte array of the file contents
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:param design_uri: Tuple as returned by urllib.parse for the design reference
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"""
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if design_uri.path != '':
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f = open(design_uri.path, 'rb')
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doc = f.read()
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return doc
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@classmethod
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def resolve_reference_ucp(cls, design_uri):
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"""Retrieve artifacts from a Airship service endpoint.
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Return a byte array of the response content. Assumes Keystone
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authentication required.
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:param design_uri: Tuple as returned by urllib.parse for the design reference
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"""
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ks_sess = KeystoneUtils.get_session()
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(new_scheme, foo) = re.subn('^[^+]+\+', '', design_uri.scheme)
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url = urllib.parse.urlunparse(
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(new_scheme, design_uri.netloc, design_uri.path, design_uri.params,
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design_uri.query, design_uri.fragment))
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LOG.debug("Calling Keystone session for url %s" % str(url))
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resp = ks_sess.get(url, timeout=get_client_timeouts())
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if resp.status_code >= 400:
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raise errors.InvalidDesignReference(
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"Received error code for reference %s: %s - %s" %
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(url, str(resp.status_code), resp.text))
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return resp.content
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scheme_handlers = {
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'http': resolve_reference_http,
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'file': resolve_reference_file,
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'https': resolve_reference_http,
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'deckhand+http': resolve_reference_ucp,
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'promenade+http': resolve_reference_ucp,
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}
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def get_client_timeouts():
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"""Return a tuple of timeouts for the request library."""
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return (config_mgr.conf.network.http_client_connect_timeout,
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config_mgr.conf.network.http_client_read_timeout)
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