208 lines
8.4 KiB
Python
208 lines
8.4 KiB
Python
# Copyright (c) 2012-2013 Mitch Garnaat http://garnaat.org/
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# Copyright 2012-2014 Amazon.com, Inc. or its affiliates. All Rights Reserved.
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#
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# Licensed under the Apache License, Version 2.0 (the "License"). You
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# may not use this file except in compliance with the License. A copy of
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# the License is located at
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#
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# http://aws.amazon.com/apache2.0/
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#
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# or in the "license" file accompanying this file. This file is
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# distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF
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# ANY KIND, either express or implied. See the License for the specific
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# language governing permissions and limitations under the License.
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import logging
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from botocore.parameters import get_parameter
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from botocore.exceptions import MissingParametersError
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from botocore.exceptions import UnknownParameterError
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from botocore.paginate import Paginator
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from botocore.payload import Payload, XMLPayload, JSONPayload
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from botocore import BotoCoreObject, xform_name
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logger = logging.getLogger(__name__)
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class Operation(BotoCoreObject):
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_DEFAULT_PAGINATOR_CLS = Paginator
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def __init__(self, service, op_data, paginator_cls=None):
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self.input = {}
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self.output = {}
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BotoCoreObject.__init__(self, **op_data)
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self.service = service
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if self.service:
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self.session = self.service.session
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else:
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self.session = None
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self.type = 'operation'
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self._params = None
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if paginator_cls is None:
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paginator_cls = self._DEFAULT_PAGINATOR_CLS
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self._paginator_cls = paginator_cls
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def __repr__(self):
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return 'Operation:%s' % self.name
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def call(self, endpoint, **kwargs):
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logger.debug("%s called with kwargs: %s", self, kwargs)
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# It probably seems a little weird to be firing two different
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# events here. The reason is that the first event is fired
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# with the parameters exactly as supplied. The second event
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# is fired with the built parameters. Generally, it's easier
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# to manipulate the former but at times, like with ReST operations
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# that build an XML or JSON payload, you have to wait for
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# build_parameters to do it's job and the latter is necessary.
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event = self.session.create_event('before-parameter-build',
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self.service.endpoint_prefix,
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self.name)
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self.session.emit(event, operation=self, endpoint=endpoint,
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params=kwargs)
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params = self.build_parameters(**kwargs)
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event = self.session.create_event('before-call',
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self.service.endpoint_prefix,
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self.name)
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self.session.emit(event, operation=self, endpoint=endpoint,
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params=params)
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response = endpoint.make_request(self, params)
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event = self.session.create_event('after-call',
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self.service.endpoint_prefix,
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self.name)
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self.session.emit(event, operation=self,
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http_response=response[0],
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parsed=response[1])
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return response
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@property
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def can_paginate(self):
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return hasattr(self, 'pagination')
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def paginate(self, endpoint, **kwargs):
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"""Iterate over the responses of an operation.
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This will return an iterator with each element
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being a tuple of (``http_response``, ``parsed_response``).
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If the operation does not paginate, a ``TypeError`` will
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be raised. You can check if an operation can be paginated
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by using the ``can_paginate`` arg.
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"""
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if not self.can_paginate:
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raise TypeError("Operation cannot be paginated: %s" % self)
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paginator = self._paginator_cls(self)
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return paginator.paginate(endpoint, **kwargs)
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@property
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def params(self):
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if self._params is None:
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self._params = self._create_parameter_objects()
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return self._params
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def _create_parameter_objects(self):
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"""
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Build the list of Parameter objects for this operation.
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"""
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logger.debug("Creating parameter objects for: %s", self)
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params = []
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if self.input and 'members' in self.input:
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for name, data in self.input['members'].items():
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param = get_parameter(self, name, data)
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params.append(param)
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return params
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def _find_payload(self):
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"""
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Searches the parameters for an operation to find the payload
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parameter, if it exists. Returns that param or None.
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"""
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payload = None
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for param in self.params:
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if hasattr(param, 'payload') and param.payload:
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payload = param
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break
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return payload
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def _get_built_params(self):
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d = {}
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if self.service.type in ('rest-xml', 'rest-json'):
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d['uri_params'] = {}
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d['headers'] = {}
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if self.service.type == 'rest-xml':
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payload = self._find_payload()
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if payload and payload.type in ('blob', 'string'):
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# If we have a payload parameter which is a scalar
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# type (either string or blob) it means we need a
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# simple payload object rather than an XMLPayload.
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d['payload'] = Payload()
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else:
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# Otherwise, use an XMLPayload. Since Route53
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# doesn't actually use the payload attribute, we
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# have to err on the safe side.
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namespace = self.service.xmlnamespace
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root_element_name = None
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if self.input and 'shape_name' in self.input:
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root_element_name = self.input['shape_name']
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d['payload'] = XMLPayload(root_element_name=root_element_name,
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namespace=namespace)
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else:
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# rest-json.
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payload = self._find_payload()
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if payload and payload.type in ('blob', 'string'):
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d['payload'] = Payload()
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else:
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d['payload'] = JSONPayload()
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return d
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def build_parameters(self, **kwargs):
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"""
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Returns a dictionary containing the kwargs for the
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given operation formatted as required to pass to the service
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in a request.
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"""
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built_params = self._get_built_params()
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missing = []
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kwargs = self._camel_to_snake_case(kwargs)
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self._check_for_unknown_params(kwargs)
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for param in self.params:
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if param.required:
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missing.append(param)
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if param.py_name in kwargs:
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if missing:
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missing.pop()
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param.build_parameter(self.service.type,
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kwargs[param.py_name],
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built_params)
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if missing:
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missing_str = ', '.join([p.py_name for p in missing])
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raise MissingParametersError(missing=missing_str,
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object_name=self)
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return built_params
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def _camel_to_snake_case(self, kwargs):
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"""
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Converts top level keys in `kwargs` from camel case to snake case
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"""
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params = {}
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for key, value in kwargs.items():
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params[xform_name(key)] = value
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return params
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def _check_for_unknown_params(self, kwargs):
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valid_names = [p.py_name for p in self.params]
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for key in kwargs:
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if key not in valid_names:
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raise UnknownParameterError(name=key, operation=self,
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choices=', '.join(valid_names))
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def is_streaming(self):
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is_streaming = False
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if self.output:
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for member_name in self.output['members']:
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member_dict = self.output['members'][member_name]
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if member_dict['type'] == 'blob':
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if member_dict.get('payload', False):
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if member_dict.get('streaming', False):
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is_streaming = member_dict.get('xmlname',
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member_name)
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return is_streaming
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