81b45f2c1d
The statless design was developed in the experiment branch, the experiment shows advantage in removing the status synchronization, uuid mapping compared to the stateful design, and also fully reduce the coupling with OpenStack services like Nova, Cinder. The overhead query latency for resources also acceptable. It's time to move the statless design to the master branch BP: https://blueprints.launchpad.net/tricircle/+spec/implement-stateless Change-Id: I51bbb60dc07da5b2e79f25e02209aa2eb72711ac Signed-off-by: Chaoyi Huang <joehuang@huawei.com>
139 lines
3.7 KiB
Python
139 lines
3.7 KiB
Python
# Copyright 2015 Huawei Technologies Co., Ltd.
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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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import urlparse
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from requests import Request
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from requests import Session
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from tricircle.common import client
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from tricircle.common import constants as cons
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from tricircle.db import api as db_api
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# the url could be endpoint registered in the keystone
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# or url sent to tricircle service, which is stored in
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# pecan.request.url
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def get_version_from_url(url):
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components = urlparse.urlsplit(url)
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path = components.path
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pos = path.find('/')
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ver = ''
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if pos == 0:
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path = path[1:]
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i = path.find('/')
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if i >= 0:
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ver = path[:i]
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else:
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ver = path
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elif pos > 0:
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ver = path[:pos]
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else:
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ver = path
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return ver
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def get_bottom_url(t_ver, t_url, b_ver, b_endpoint):
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"""get_bottom_url
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convert url received by Tricircle service to bottom OpenStack
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request url through the configured endpoint in the KeyStone
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:param t_ver: version of top service
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:param t_url: request url to the top service
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:param b_ver: version of bottom service
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:param b_endpoint: endpoint registered in keystone for bottom service
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:return: request url to bottom service
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"""
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t_parse = urlparse.urlsplit(t_url)
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after_ver = t_parse.path
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remove_ver = '/' + t_ver + '/'
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pos = after_ver.find(remove_ver)
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if pos == 0:
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after_ver = after_ver[len(remove_ver):]
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else:
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remove_ver = t_ver + '/'
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pos = after_ver.find(remove_ver)
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if pos == 0:
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after_ver = after_ver[len(remove_ver):]
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if after_ver == t_parse.path:
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# wrong t_url
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return ''
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b_parse = urlparse.urlsplit(b_endpoint)
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scheme = b_parse.scheme
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netloc = b_parse.netloc
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path = '/' + b_ver + '/' + after_ver
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if b_ver == '':
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path = '/' + after_ver
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query = t_parse.query
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fragment = t_parse.fragment
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b_url = urlparse.urlunsplit((scheme,
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netloc,
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path,
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query,
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fragment))
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return b_url
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def get_pod_service_endpoint(context, pod_name, st):
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pod = db_api.get_pod_by_name(context, pod_name)
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if pod:
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c = client.Client()
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return c.get_endpoint(context, pod['pod_id'], st)
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return ''
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def get_pod_service_ctx(context, t_url, pod_name, s_type=cons.ST_NOVA):
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t_ver = get_version_from_url(t_url)
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b_endpoint = get_pod_service_endpoint(context,
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pod_name,
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s_type)
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b_ver = get_version_from_url(b_endpoint)
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b_url = ''
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if b_endpoint != '':
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b_url = get_bottom_url(t_ver, t_url, b_ver, b_endpoint)
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return {'t_ver': t_ver, 'b_ver': b_ver,
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't_url': t_url, 'b_url': b_url}
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def forward_req(context, action, b_headers, b_url, b_body):
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s = Session()
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req = Request(action, b_url,
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data=b_body,
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headers=b_headers)
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prepped = req.prepare()
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# do something with prepped.body
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# do something with prepped.headers
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resp = s.send(prepped,
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timeout=60)
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return resp
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