4afa13c3c4
- Guidelines referenced from: http://docs.openstack.org/developer/oslo.i18n/usage.html Change-Id: I938919958525b2db0c8a517b951a23f974a7762e
241 lines
8.8 KiB
Python
241 lines
8.8 KiB
Python
# Copyright 2012 VMware, 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.
|
|
|
|
|
|
import eventlet
|
|
from oslo_log import log as logging
|
|
from oslo_serialization import jsonutils
|
|
from six.moves import http_client as httplib
|
|
from six.moves.urllib import parse
|
|
|
|
from vmware_nsx._i18n import _LI, _LW
|
|
from vmware_nsx.api_client import request
|
|
|
|
LOG = logging.getLogger(__name__)
|
|
USER_AGENT = "Neutron eventlet client/2.0"
|
|
|
|
|
|
class EventletApiRequest(request.ApiRequest):
|
|
'''Eventlet-based ApiRequest class.
|
|
|
|
This class will form the basis for eventlet-based ApiRequest classes
|
|
'''
|
|
|
|
# Maximum number of green threads present in the system at one time.
|
|
API_REQUEST_POOL_SIZE = request.DEFAULT_API_REQUEST_POOL_SIZE
|
|
|
|
# Pool of green threads. One green thread is allocated per incoming
|
|
# request. Incoming requests will block when the pool is empty.
|
|
API_REQUEST_POOL = eventlet.GreenPool(API_REQUEST_POOL_SIZE)
|
|
|
|
# A unique id is assigned to each incoming request. When the current
|
|
# request id reaches MAXIMUM_REQUEST_ID it wraps around back to 0.
|
|
MAXIMUM_REQUEST_ID = request.DEFAULT_MAXIMUM_REQUEST_ID
|
|
|
|
# The request id for the next incoming request.
|
|
CURRENT_REQUEST_ID = 0
|
|
|
|
def __init__(self, client_obj, url, method="GET", body=None,
|
|
headers=None,
|
|
retries=request.DEFAULT_RETRIES,
|
|
auto_login=True,
|
|
redirects=request.DEFAULT_REDIRECTS,
|
|
http_timeout=request.DEFAULT_HTTP_TIMEOUT, client_conn=None):
|
|
'''Constructor.'''
|
|
self._api_client = client_obj
|
|
self._url = url
|
|
self._method = method
|
|
self._body = body
|
|
self._headers = headers or {}
|
|
self._request_timeout = http_timeout * retries
|
|
self._retries = retries
|
|
self._auto_login = auto_login
|
|
self._redirects = redirects
|
|
self._http_timeout = http_timeout
|
|
self._client_conn = client_conn
|
|
|
|
self._request_error = None
|
|
|
|
if "User-Agent" not in self._headers:
|
|
self._headers["User-Agent"] = USER_AGENT
|
|
|
|
self._green_thread = None
|
|
# Retrieve and store this instance's unique request id.
|
|
self._request_id = EventletApiRequest.CURRENT_REQUEST_ID
|
|
# Update the class variable that tracks request id.
|
|
# Request IDs wrap around at MAXIMUM_REQUEST_ID
|
|
next_request_id = self._request_id + 1
|
|
next_request_id %= self.MAXIMUM_REQUEST_ID
|
|
EventletApiRequest.CURRENT_REQUEST_ID = next_request_id
|
|
|
|
@classmethod
|
|
def _spawn(cls, func, *args, **kwargs):
|
|
'''Allocate a green thread from the class pool.'''
|
|
return cls.API_REQUEST_POOL.spawn(func, *args, **kwargs)
|
|
|
|
def spawn(self, func, *args, **kwargs):
|
|
'''Spawn a new green thread with the supplied function and args.'''
|
|
return self.__class__._spawn(func, *args, **kwargs)
|
|
|
|
@classmethod
|
|
def joinall(cls):
|
|
'''Wait for all outstanding requests to complete.'''
|
|
return cls.API_REQUEST_POOL.waitall()
|
|
|
|
def join(self):
|
|
'''Wait for instance green thread to complete.'''
|
|
if self._green_thread is not None:
|
|
return self._green_thread.wait()
|
|
return Exception(_('Joining an invalid green thread'))
|
|
|
|
def start(self):
|
|
'''Start request processing.'''
|
|
self._green_thread = self.spawn(self._run)
|
|
|
|
def copy(self):
|
|
'''Return a copy of this request instance.'''
|
|
return EventletApiRequest(
|
|
self._api_client, self._url, self._method, self._body,
|
|
self._headers, self._retries,
|
|
self._auto_login, self._redirects, self._http_timeout)
|
|
|
|
def _run(self):
|
|
'''Method executed within green thread.'''
|
|
if self._request_timeout:
|
|
# No timeout exception escapes the with block.
|
|
with eventlet.timeout.Timeout(self._request_timeout, False):
|
|
return self._handle_request()
|
|
|
|
LOG.info(_LI('[%d] Request timeout.'), self._rid())
|
|
self._request_error = Exception(_('Request timeout'))
|
|
return None
|
|
else:
|
|
return self._handle_request()
|
|
|
|
def _handle_request(self):
|
|
'''First level request handling.'''
|
|
attempt = 0
|
|
timeout = 0
|
|
response = None
|
|
while response is None and attempt <= self._retries:
|
|
eventlet.greenthread.sleep(timeout)
|
|
attempt += 1
|
|
|
|
req = self._issue_request()
|
|
# automatically raises any exceptions returned.
|
|
if isinstance(req, httplib.HTTPResponse):
|
|
timeout = 0
|
|
if attempt <= self._retries:
|
|
if req.status in (httplib.UNAUTHORIZED, httplib.FORBIDDEN):
|
|
continue
|
|
elif req.status == httplib.SERVICE_UNAVAILABLE:
|
|
timeout = 0.5
|
|
continue
|
|
# else fall through to return the error code
|
|
|
|
LOG.debug("[%(rid)d] Completed request '%(method)s %(url)s'"
|
|
": %(status)s",
|
|
{'rid': self._rid(), 'method': self._method,
|
|
'url': self._url, 'status': req.status})
|
|
self._request_error = None
|
|
response = req
|
|
else:
|
|
LOG.info(_LI('[%(rid)d] Error while handling request: '
|
|
'%(req)s'),
|
|
{'rid': self._rid(), 'req': req})
|
|
self._request_error = req
|
|
response = None
|
|
return response
|
|
|
|
|
|
class LoginRequestEventlet(EventletApiRequest):
|
|
'''Process a login request.'''
|
|
|
|
def __init__(self, client_obj, user, password, client_conn=None,
|
|
headers=None):
|
|
if headers is None:
|
|
headers = {}
|
|
headers.update({"Content-Type": "application/x-www-form-urlencoded"})
|
|
body = parse.urlencode({"username": user, "password": password})
|
|
super(LoginRequestEventlet, self).__init__(
|
|
client_obj, "/ws.v1/login", "POST", body, headers,
|
|
auto_login=False, client_conn=client_conn)
|
|
|
|
def session_cookie(self):
|
|
if self.successful():
|
|
return self.value.getheader("Set-Cookie")
|
|
return None
|
|
|
|
|
|
class GetApiProvidersRequestEventlet(EventletApiRequest):
|
|
'''Get a list of API providers.'''
|
|
|
|
def __init__(self, client_obj):
|
|
url = "/ws.v1/control-cluster/node?fields=roles"
|
|
super(GetApiProvidersRequestEventlet, self).__init__(
|
|
client_obj, url, "GET", auto_login=True)
|
|
|
|
def api_providers(self):
|
|
"""Parse api_providers from response.
|
|
|
|
Returns: api_providers in [(host, port, is_ssl), ...] format
|
|
"""
|
|
def _provider_from_listen_addr(addr):
|
|
# (pssl|ptcp):<ip>:<port> => (host, port, is_ssl)
|
|
parts = addr.split(':')
|
|
return (parts[1], int(parts[2]), parts[0] == 'pssl')
|
|
|
|
try:
|
|
if self.successful():
|
|
ret = []
|
|
body = jsonutils.loads(self.value.body)
|
|
for node in body.get('results', []):
|
|
for role in node.get('roles', []):
|
|
if role.get('role') == 'api_provider':
|
|
addr = role.get('listen_addr')
|
|
if addr:
|
|
ret.append(_provider_from_listen_addr(addr))
|
|
return ret
|
|
except Exception as e:
|
|
LOG.warn(_LW("[%(rid)d] Failed to parse API provider: %(e)s"),
|
|
{'rid': self._rid(), 'e': e})
|
|
# intentionally fall through
|
|
return None
|
|
|
|
|
|
class GenericRequestEventlet(EventletApiRequest):
|
|
'''Handle a generic request.'''
|
|
|
|
def __init__(self, client_obj, method, url, body, content_type,
|
|
auto_login=False,
|
|
http_timeout=request.DEFAULT_HTTP_TIMEOUT,
|
|
retries=request.DEFAULT_RETRIES,
|
|
redirects=request.DEFAULT_REDIRECTS):
|
|
headers = {"Content-Type": content_type}
|
|
super(GenericRequestEventlet, self).__init__(
|
|
client_obj, url, method, body, headers,
|
|
retries=retries,
|
|
auto_login=auto_login, redirects=redirects,
|
|
http_timeout=http_timeout)
|
|
|
|
def session_cookie(self):
|
|
if self.successful():
|
|
return self.value.getheader("Set-Cookie")
|
|
return None
|
|
|
|
|
|
request.ApiRequest.register(EventletApiRequest)
|