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OpenStack Study: plugin_helper.py**** CubicPower OpenStack Study ****
# Copyright 2014 OneConvergence, Inc. 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. # # @author: Kedar Kulkarni, One Convergence, Inc. """Library to talk to NVSD controller.""" import httplib import time from urlparse import urljoin from oslo.config import cfg import requests from neutron.openstack.common import jsonutils as json from neutron.openstack.common import log as logging import neutron.plugins.oneconvergence.lib.exception as exception LOG = logging.getLogger(__name__)
**** CubicPower OpenStack Study **** def initialize_plugin_helper(): nvsdcontroller = NVSDController() return nvsdcontroller
**** CubicPower OpenStack Study **** class NVSDController(object): """Encapsulates the NVSD Controller details."""
**** CubicPower OpenStack Study **** def __init__(self): self._host = cfg.CONF.nvsd.nvsd_ip self._port = cfg.CONF.nvsd.nvsd_port self._user = cfg.CONF.nvsd.nvsd_user self._password = cfg.CONF.nvsd.nvsd_passwd self._retries = cfg.CONF.nvsd.nvsd_retries self._request_timeout = float(cfg.CONF.nvsd.request_timeout) self.api_url = 'http://' + self._host + ':' + str(self._port) self.pool = requests.Session() self.auth_token = None
**** CubicPower OpenStack Study **** def do_request(self, method, url=None, headers=None, data=None, timeout=10): response = self.pool.request(method, url=url, headers=headers, data=data, timeout=self._request_timeout) return response
**** CubicPower OpenStack Study **** def login(self): """Login to NVSD Controller.""" headers = {"Content-Type": "application/json"} login_url = urljoin(self.api_url, "/pluginhandler/ocplugin/authmgmt/login") data = json.dumps({"user_name": self._user, "passwd": self._password}) attempts = 0 while True: if attempts < self._retries: attempts += 1 elif self._retries == 0: attempts = 0 else: msg = _("Unable to connect to NVSD controller. Exiting after " "%(retries)s attempts") % {'retries': self._retries} LOG.error(msg) raise exception.ServerException(reason=msg) try: response = self.do_request("POST", url=login_url, headers=headers, data=data, timeout=self._request_timeout) break except Exception as e: LOG.error(_("Login Failed: %s"), e) LOG.error(_("Unable to establish connection" " with Controller %s"), self.api_url) LOG.error(_("Retrying after 1 second...")) time.sleep(1) if response.status_code == requests.codes.ok: LOG.debug(_("Login Successful %(uri)s " "%(status)s"), {'uri': self.api_url, 'status': response.status_code}) self.auth_token = json.loads(response.content)["session_uuid"] LOG.debug(_("AuthToken = %s"), self.auth_token) else: LOG.error(_("login failed")) return
**** CubicPower OpenStack Study **** def request(self, method, url, body="", content_type="application/json"): """Issue a request to NVSD controller.""" if self.auth_token is None: LOG.warning(_("No Token, Re-login")) self.login() headers = {"Content-Type": content_type} uri = urljoin(url, "?authToken=%s" % self.auth_token) url = urljoin(self.api_url, uri) request_ok = False response = None try: response = self.do_request(method, url=url, headers=headers, data=body, timeout=self._request_timeout) LOG.debug(_("request: %(method)s %(uri)s successful"), {'method': method, 'uri': self.api_url + uri}) request_ok = True except httplib.IncompleteRead as e: response = e.partial request_ok = True except Exception as e: LOG.error(_("request: Request failed from " "Controller side :%s"), e) if response is None: # Timeout. LOG.error(_("Response is Null, Request timed out: %(method)s to " "%(uri)s"), {'method': method, 'uri': uri}) self.auth_token = None raise exception.RequestTimeout() status = response.status_code if status == requests.codes.unauthorized: self.auth_token = None # Raise an exception to inform that the request failed. raise exception.UnAuthorizedException() if status in self.error_codes: LOG.error(_("Request %(method)s %(uri)s body = %(body)s failed " "with status %(status)s"), {'method': method, 'uri': uri, 'body': body, 'status': status}) LOG.error(_("%s"), response.reason) raise self.error_codes[status]() elif status not in (requests.codes.ok, requests.codes.created, requests.codes.no_content): LOG.error(_("%(method)s to %(url)s, unexpected response code: " "%(status)d"), {'method': method, 'url': url, 'status': status}) return if not request_ok: LOG.error(_("Request failed from Controller side with " "Status=%s"), status) raise exception.ServerException() else: LOG.debug(_("Success: %(method)s %(url)s status=%(status)s"), {'method': method, 'url': self.api_url + uri, 'status': status}) response.body = response.content return response error_codes = { 404: exception.NotFoundException, 409: exception.BadRequestException, 500: exception.InternalServerError, 503: exception.ServerException, 403: exception.ForbiddenException, 301: exception.NVSDAPIException, 307: exception.NVSDAPIException, 400: exception.NVSDAPIException, }
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