watcherclient.common.base

Source code for watcherclient.common.base

#
# Copyright 2012 OpenStack LLC.
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#         http://www.apache.org/licenses/LICENSE-2.0
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"""
Base utilities to build API operation managers and objects on top of.
"""

import copy

import six.moves.urllib.parse as urlparse

from watcherclient.common.apiclient import base


[docs]def getid(obj): """Wrapper to get object's ID. Abstracts the common pattern of allowing both an object or an object's ID (UUID) as a parameter when dealing with relationships. """ try: return obj.id except AttributeError: return obj
[docs]class Manager(object): """Provides CRUD operations with a particular API.""" resource_class = None def __init__(self, api): self.api = api def _create(self, url, body): resp, body = self.api.json_request('POST', url, body=body) if body: return self.resource_class(self, body) def _format_body_data(self, body, response_key): if response_key: try: data = body[response_key] except KeyError: return [] else: data = body if not isinstance(data, list): data = [data] return data def _list_pagination(self, url, response_key=None, obj_class=None, limit=None): """Retrieve a list of items. The Watcher API is configured to return a maximum number of items per request, (see Watcher's api.max_limit option). This iterates over the 'next' link (pagination) in the responses, to get the number of items specified by 'limit'. If 'limit' is None this function will continue pagination until there are no more values to be returned. :param url: a partial URL, e.g. '/nodes' :param response_key: the key to be looked up in response dictionary, e.g. 'nodes' :param obj_class: class for constructing the returned objects. :param limit: maximum number of items to return. If None returns everything. """ if obj_class is None: obj_class = self.resource_class if limit is not None: limit = int(limit) object_list = [] object_count = 0 limit_reached = False while url: resp, body = self.api.json_request('GET', url) data = self._format_body_data(body, response_key) for obj in data: object_list.append(obj_class(self, obj, loaded=True)) object_count += 1 if limit and object_count >= limit: # break the for loop limit_reached = True break # break the while loop and return if limit_reached: break url = body.get('next') if url: # NOTE(lucasagomes): We need to edit the URL to remove # the scheme and netloc url_parts = list(urlparse.urlparse(url)) url_parts[0] = url_parts[1] = '' url = urlparse.urlunparse(url_parts) return object_list def _list(self, url, response_key=None, obj_class=None, body=None): resp, body = self.api.json_request('GET', url) if obj_class is None: obj_class = self.resource_class data = self._format_body_data(body, response_key) return [obj_class(self, res, loaded=True) for res in data if res] def _update(self, url, body, method='PATCH', response_key=None): resp, body = self.api.json_request(method, url, body=body) # PATCH/PUT requests may not return a body if body: return self.resource_class(self, body) def _delete(self, url): self.api.raw_request('DELETE', url)
[docs]class Resource(base.Resource): """Represents a particular instance of an object (tenant, user, etc). This is pretty much just a bag for attributes. """
[docs] def to_dict(self): return copy.deepcopy(self._info)
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