114 lines
3.5 KiB
Python
114 lines
3.5 KiB
Python
# Copyright (c) 2013 Rackspace, Inc.
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# Copyright (c) 2013 Red Hat, Inc.
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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
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# 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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import json
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from stevedore import driver
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from zaqarclient import auth
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from zaqarclient import errors
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def prepare_request(auth_opts=None, data=None, **kwargs):
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"""Prepares a request
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This method takes care of authentication
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and all other steps in the preparation chain.
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The request returned by this call is ready to
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be sent to the server.
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:param auth_opts: Auth parameters
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:type auth_opts: `dict`
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:param data: Optional data to send along with the
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request. If data is not None, it'll be serialized.
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:type data: Any primitive type that is json-serializable.
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:param kwargs: Anything accepted by `Request`
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:returns: A `Request` instance ready to be sent.
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:rtype: `Request`
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"""
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req = Request(**kwargs)
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auth_backend = auth.get_backend(**(auth_opts or {}))
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# TODO(flaper87): Do something smarter
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# to get the api_version.
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req = auth_backend.authenticate(1, req)
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if data is not None:
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req.content = json.dumps(data)
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return req
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class Request(object):
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"""General data for a Zaqar request
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The idea is to be declarative i.e. specify *what* is desired. It's up to
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the respective transport to turn this into a layer-specific request.
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*NOTE:* This implementation is not definitive and may change.
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:param endpoint: Server's endpoint
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:type endpoint: str
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:param operation: Operation to issue on the endpoint, i.e:
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- get_queues
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- get_messages
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:type operation: str
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:param content: Request's body. Default: None
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:type content: str
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:param params: Query string params. Default: None
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:type params: dict
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:param headers: Request headers. Default: None
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:type headers: dict
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:param api: Api entry point. i.e: 'queues.v1'
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:type api: `six.text_type`.
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"""
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def __init__(self, endpoint='', operation='',
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ref='', content=None, params=None,
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headers=None, api=None):
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self._api = None
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self._api_mod = api
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self.endpoint = endpoint
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self.operation = operation
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self.ref = ref
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self.content = content
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self.params = params or {}
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self.headers = headers or {}
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@property
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def api(self):
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if not self._api and self._api_mod:
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try:
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namespace = 'zaqarclient.api'
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mgr = driver.DriverManager(namespace,
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self._api_mod,
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invoke_on_load=True)
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self._api = mgr.driver
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except RuntimeError as ex:
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raise errors.DriverLoadFailure(self._api_mod, ex)
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return self._api
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def validate(self):
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"""Validation shortcut
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Refer to `transport.api.Api.validate` for
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more information about this method.
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"""
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return self.api.validate(params=self.params,
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content=self.content)
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