540 lines
20 KiB
Python
540 lines
20 KiB
Python
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# Copyright 2015 Google Inc. All rights reserved.
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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 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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"""Create / interact with gcloud pubsub connections."""
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import os
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from gcloud import connection as base_connection
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from gcloud.environment_vars import PUBSUB_EMULATOR
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class Connection(base_connection.JSONConnection):
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"""A connection to Google Cloud Pubsub via the JSON REST API.
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:type credentials: :class:`oauth2client.client.OAuth2Credentials`
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:param credentials: (Optional) The OAuth2 Credentials to use for this
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connection.
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:type http: :class:`httplib2.Http` or class that defines ``request()``.
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:param http: (Optional) HTTP object to make requests.
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:type api_base_url: string
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:param api_base_url: The base of the API call URL. Defaults to the value
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:attr:`Connection.API_BASE_URL`.
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"""
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API_BASE_URL = 'https://pubsub.googleapis.com'
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"""The base of the API call URL."""
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API_VERSION = 'v1'
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"""The version of the API, used in building the API call's URL."""
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API_URL_TEMPLATE = '{api_base_url}/{api_version}{path}'
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"""A template for the URL of a particular API call."""
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SCOPE = ('https://www.googleapis.com/auth/pubsub',
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'https://www.googleapis.com/auth/cloud-platform')
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"""The scopes required for authenticating as a Cloud Pub/Sub consumer."""
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def __init__(self, credentials=None, http=None, api_base_url=None):
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super(Connection, self).__init__(credentials=credentials, http=http)
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if api_base_url is None:
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emulator_host = os.getenv(PUBSUB_EMULATOR)
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if emulator_host is None:
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api_base_url = self.__class__.API_BASE_URL
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else:
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api_base_url = 'http://' + emulator_host
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self.api_base_url = api_base_url
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def build_api_url(self, path, query_params=None,
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api_base_url=None, api_version=None):
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"""Construct an API url given a few components, some optional.
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Typically, you shouldn't need to use this method.
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:type path: string
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:param path: The path to the resource.
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:type query_params: dict or list
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:param query_params: A dictionary of keys and values (or list of
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key-value pairs) to insert into the query
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string of the URL.
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:type api_base_url: string
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:param api_base_url: The base URL for the API endpoint.
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Typically you won't have to provide this.
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:type api_version: string
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:param api_version: The version of the API to call.
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Typically you shouldn't provide this and instead
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use the default for the library.
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:rtype: string
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:returns: The URL assembled from the pieces provided.
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"""
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if api_base_url is None:
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api_base_url = self.api_base_url
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return super(Connection, self.__class__).build_api_url(
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path, query_params=query_params,
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api_base_url=api_base_url, api_version=api_version)
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class _PublisherAPI(object):
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"""Helper mapping publisher-related APIs.
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:type connection: :class:`Connection`
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:param connection: the connection used to make API requests.
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"""
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def __init__(self, connection):
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self._connection = connection
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def list_topics(self, project, page_size=None, page_token=None):
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"""API call: list topics for a given project
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See:
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https://cloud.google.com/pubsub/reference/rest/v1/projects.topics/list
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:type project: string
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:param project: project ID
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:type page_size: int
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:param page_size: maximum number of topics to return, If not passed,
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defaults to a value set by the API.
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:type page_token: string
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:param page_token: opaque marker for the next "page" of topics. If not
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passed, the API will return the first page of
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topics.
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:rtype: tuple, (list, str)
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:returns: list of ``Topic`` resource dicts, plus a
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"next page token" string: if not None, indicates that
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more topics can be retrieved with another call (pass that
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value as ``page_token``).
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"""
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conn = self._connection
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params = {}
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if page_size is not None:
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params['pageSize'] = page_size
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if page_token is not None:
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params['pageToken'] = page_token
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path = '/projects/%s/topics' % (project,)
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resp = conn.api_request(method='GET', path=path, query_params=params)
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return resp.get('topics', ()), resp.get('nextPageToken')
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def topic_create(self, topic_path):
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"""API call: create a topic
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See:
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https://cloud.google.com/pubsub/reference/rest/v1/projects.topics/create
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:type topic_path: string
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:param topic_path: the fully-qualified path of the new topic, in format
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``projects/<PROJECT>/topics/<TOPIC_NAME>``.
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:rtype: dict
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:returns: ``Topic`` resource returned from the API.
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"""
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conn = self._connection
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return conn.api_request(method='PUT', path='/%s' % (topic_path,))
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def topic_get(self, topic_path):
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"""API call: retrieve a topic
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See:
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https://cloud.google.com/pubsub/reference/rest/v1/projects.topics/get
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:type topic_path: string
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:param topic_path: the fully-qualified path of the topic, in format
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``projects/<PROJECT>/topics/<TOPIC_NAME>``.
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:rtype: dict
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:returns: ``Topic`` resource returned from the API.
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"""
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conn = self._connection
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return conn.api_request(method='GET', path='/%s' % (topic_path,))
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def topic_delete(self, topic_path):
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"""API call: delete a topic
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See:
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https://cloud.google.com/pubsub/reference/rest/v1/projects.topics/delete
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:type topic_path: string
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:param topic_path: the fully-qualified path of the topic, in format
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``projects/<PROJECT>/topics/<TOPIC_NAME>``.
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"""
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conn = self._connection
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conn.api_request(method='DELETE', path='/%s' % (topic_path,))
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def topic_publish(self, topic_path, messages):
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"""API call: publish one or more messages to a topic
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See:
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https://cloud.google.com/pubsub/reference/rest/v1/projects.topics/publish
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:type topic_path: string
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:param topic_path: the fully-qualified path of the topic, in format
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``projects/<PROJECT>/topics/<TOPIC_NAME>``.
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:type messages: list of dict
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:param messages: messages to be published.
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:rtype: list of string
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:returns: list of opaque IDs for published messages.
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"""
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conn = self._connection
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data = {'messages': messages}
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response = conn.api_request(
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method='POST', path='/%s:publish' % (topic_path,), data=data)
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return response['messageIds']
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def topic_list_subscriptions(self, topic_path, page_size=None,
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page_token=None):
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"""API call: list subscriptions bound to a topic
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See:
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https://cloud.google.com/pubsub/reference/rest/v1/projects.topics.subscriptions/list
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:type topic_path: string
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:param topic_path: the fully-qualified path of the topic, in format
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``projects/<PROJECT>/topics/<TOPIC_NAME>``.
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:type page_size: int
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:param page_size: maximum number of subscriptions to return, If not
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passed, defaults to a value set by the API.
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:type page_token: string
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:param page_token: opaque marker for the next "page" of topics. If not
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passed, the API will return the first page of
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topics.
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:rtype: list of strings
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:returns: fully-qualified names of subscriptions for the supplied
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topic.
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"""
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conn = self._connection
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params = {}
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if page_size is not None:
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params['pageSize'] = page_size
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if page_token is not None:
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params['pageToken'] = page_token
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path = '/%s/subscriptions' % (topic_path,)
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resp = conn.api_request(method='GET', path=path, query_params=params)
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return resp.get('subscriptions', ()), resp.get('nextPageToken')
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class _SubscriberAPI(object):
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"""Helper mapping subscriber-related APIs.
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:type connection: :class:`Connection`
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:param connection: the connection used to make API requests.
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"""
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def __init__(self, connection):
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self._connection = connection
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def list_subscriptions(self, project, page_size=None, page_token=None):
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"""API call: list subscriptions for a given project
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See:
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https://cloud.google.com/pubsub/reference/rest/v1/projects.subscriptions/list
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:type project: string
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:param project: project ID
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:type page_size: int
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:param page_size: maximum number of subscriptions to return, If not
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passed, defaults to a value set by the API.
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:type page_token: string
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:param page_token: opaque marker for the next "page" of subscriptions.
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If not passed, the API will return the first page
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of subscriptions.
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:rtype: tuple, (list, str)
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:returns: list of ``Subscription`` resource dicts, plus a
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"next page token" string: if not None, indicates that
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more subscriptions can be retrieved with another call (pass
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that value as ``page_token``).
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"""
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conn = self._connection
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params = {}
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if page_size is not None:
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params['pageSize'] = page_size
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if page_token is not None:
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params['pageToken'] = page_token
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path = '/projects/%s/subscriptions' % (project,)
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resp = conn.api_request(method='GET', path=path, query_params=params)
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return resp.get('subscriptions', ()), resp.get('nextPageToken')
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def subscription_create(self, subscription_path, topic_path,
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ack_deadline=None, push_endpoint=None):
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"""API call: create a subscription
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See:
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https://cloud.google.com/pubsub/reference/rest/v1/projects.subscriptions/create
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:type subscription_path: string
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:param subscription_path: the fully-qualified path of the new
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subscription, in format
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``projects/<PROJECT>/subscriptions/<SUB_NAME>``.
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:type topic_path: string
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:param topic_path: the fully-qualified path of the topic being
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subscribed, in format
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``projects/<PROJECT>/topics/<TOPIC_NAME>``.
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:type ack_deadline: int, or ``NoneType``
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:param ack_deadline: the deadline (in seconds) by which messages pulled
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from the back-end must be acknowledged.
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:type push_endpoint: string, or ``NoneType``
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:param push_endpoint: URL to which messages will be pushed by the
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back-end. If not set, the application must pull
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messages.
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:rtype: dict
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:returns: ``Subscription`` resource returned from the API.
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"""
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conn = self._connection
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path = '/%s' % (subscription_path,)
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resource = {'topic': topic_path}
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if ack_deadline is not None:
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resource['ackDeadlineSeconds'] = ack_deadline
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if push_endpoint is not None:
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resource['pushConfig'] = {'pushEndpoint': push_endpoint}
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return conn.api_request(method='PUT', path=path, data=resource)
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def subscription_get(self, subscription_path):
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"""API call: retrieve a subscription
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See:
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https://cloud.google.com/pubsub/reference/rest/v1/projects.subscriptions/get
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:type subscription_path: string
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:param subscription_path: the fully-qualified path of the subscription,
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in format
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``projects/<PROJECT>/subscriptions/<SUB_NAME>``.
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:rtype: dict
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:returns: ``Subscription`` resource returned from the API.
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"""
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conn = self._connection
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path = '/%s' % (subscription_path,)
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return conn.api_request(method='GET', path=path)
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def subscription_delete(self, subscription_path):
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"""API call: delete a subscription
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See:
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https://cloud.google.com/pubsub/reference/rest/v1/projects.subscriptions/delete
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:type subscription_path: string
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:param subscription_path: the fully-qualified path of the subscription,
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in format
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``projects/<PROJECT>/subscriptions/<SUB_NAME>``.
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"""
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conn = self._connection
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path = '/%s' % (subscription_path,)
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conn.api_request(method='DELETE', path=path)
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def subscription_modify_push_config(self, subscription_path,
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push_endpoint):
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"""API call: update push config of a subscription
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See:
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https://cloud.google.com/pubsub/reference/rest/v1/projects.subscriptions/modifyPushConfig
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:type subscription_path: string
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:param subscription_path: the fully-qualified path of the new
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subscription, in format
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``projects/<PROJECT>/subscriptions/<SUB_NAME>``.
|
||
|
|
|
||
|
|
:type push_endpoint: string, or ``NoneType``
|
||
|
|
:param push_endpoint: URL to which messages will be pushed by the
|
||
|
|
back-end. If not set, the application must pull
|
||
|
|
messages.
|
||
|
|
"""
|
||
|
|
conn = self._connection
|
||
|
|
path = '/%s:modifyPushConfig' % (subscription_path,)
|
||
|
|
resource = {'pushConfig': {'pushEndpoint': push_endpoint}}
|
||
|
|
conn.api_request(method='POST', path=path, data=resource)
|
||
|
|
|
||
|
|
def subscription_pull(self, subscription_path, return_immediately=False,
|
||
|
|
max_messages=1):
|
||
|
|
"""API call: retrieve messages for a subscription
|
||
|
|
|
||
|
|
See:
|
||
|
|
https://cloud.google.com/pubsub/reference/rest/v1/projects.subscriptions/modifyPushConfig
|
||
|
|
|
||
|
|
:type subscription_path: string
|
||
|
|
:param subscription_path: the fully-qualified path of the new
|
||
|
|
subscription, in format
|
||
|
|
``projects/<PROJECT>/subscriptions/<SUB_NAME>``.
|
||
|
|
|
||
|
|
:type return_immediately: boolean
|
||
|
|
:param return_immediately: if True, the back-end returns even if no
|
||
|
|
messages are available; if False, the API
|
||
|
|
call blocks until one or more messages are
|
||
|
|
available.
|
||
|
|
|
||
|
|
:type max_messages: int
|
||
|
|
:param max_messages: the maximum number of messages to return.
|
||
|
|
|
||
|
|
:rtype: list of dict
|
||
|
|
:returns: the ``receivedMessages`` element of the response.
|
||
|
|
"""
|
||
|
|
conn = self._connection
|
||
|
|
path = '/%s:pull' % (subscription_path,)
|
||
|
|
data = {
|
||
|
|
'returnImmediately': return_immediately,
|
||
|
|
'maxMessages': max_messages,
|
||
|
|
}
|
||
|
|
response = conn.api_request(method='POST', path=path, data=data)
|
||
|
|
return response.get('receivedMessages', ())
|
||
|
|
|
||
|
|
def subscription_acknowledge(self, subscription_path, ack_ids):
|
||
|
|
"""API call: acknowledge retrieved messages
|
||
|
|
|
||
|
|
See:
|
||
|
|
https://cloud.google.com/pubsub/reference/rest/v1/projects.subscriptions/modifyPushConfig
|
||
|
|
|
||
|
|
:type subscription_path: string
|
||
|
|
:param subscription_path: the fully-qualified path of the new
|
||
|
|
subscription, in format
|
||
|
|
``projects/<PROJECT>/subscriptions/<SUB_NAME>``.
|
||
|
|
|
||
|
|
:type ack_ids: list of string
|
||
|
|
:param ack_ids: ack IDs of messages being acknowledged
|
||
|
|
"""
|
||
|
|
conn = self._connection
|
||
|
|
path = '/%s:acknowledge' % (subscription_path,)
|
||
|
|
data = {
|
||
|
|
'ackIds': ack_ids,
|
||
|
|
}
|
||
|
|
conn.api_request(method='POST', path=path, data=data)
|
||
|
|
|
||
|
|
def subscription_modify_ack_deadline(self, subscription_path, ack_ids,
|
||
|
|
ack_deadline):
|
||
|
|
"""API call: update ack deadline for retrieved messages
|
||
|
|
|
||
|
|
See:
|
||
|
|
https://cloud.google.com/pubsub/reference/rest/v1/projects.subscriptions/modifyAckDeadline
|
||
|
|
|
||
|
|
:type subscription_path: string
|
||
|
|
:param subscription_path: the fully-qualified path of the new
|
||
|
|
subscription, in format
|
||
|
|
``projects/<PROJECT>/subscriptions/<SUB_NAME>``.
|
||
|
|
|
||
|
|
:type ack_ids: list of string
|
||
|
|
:param ack_ids: ack IDs of messages being acknowledged
|
||
|
|
|
||
|
|
:type ack_deadline: int
|
||
|
|
:param ack_deadline: the deadline (in seconds) by which messages pulled
|
||
|
|
from the back-end must be acknowledged.
|
||
|
|
"""
|
||
|
|
conn = self._connection
|
||
|
|
path = '/%s:modifyAckDeadline' % (subscription_path,)
|
||
|
|
data = {
|
||
|
|
'ackIds': ack_ids,
|
||
|
|
'ackDeadlineSeconds': ack_deadline,
|
||
|
|
}
|
||
|
|
conn.api_request(method='POST', path=path, data=data)
|
||
|
|
|
||
|
|
|
||
|
|
class _IAMPolicyAPI(object):
|
||
|
|
"""Helper mapping IAM policy-related APIs.
|
||
|
|
|
||
|
|
:type connection: :class:`Connection`
|
||
|
|
:param connection: the connection used to make API requests.
|
||
|
|
"""
|
||
|
|
|
||
|
|
def __init__(self, connection):
|
||
|
|
self._connection = connection
|
||
|
|
|
||
|
|
def get_iam_policy(self, target_path):
|
||
|
|
"""API call: fetch the IAM policy for the target
|
||
|
|
|
||
|
|
See:
|
||
|
|
https://cloud.google.com/pubsub/reference/rest/v1/projects.topics/getIamPolicy
|
||
|
|
https://cloud.google.com/pubsub/reference/rest/v1/projects.subscriptions/getIamPolicy
|
||
|
|
|
||
|
|
:type target_path: string
|
||
|
|
:param target_path: the path of the target object.
|
||
|
|
|
||
|
|
:rtype: dict
|
||
|
|
:returns: the resource returned by the ``getIamPolicy`` API request.
|
||
|
|
"""
|
||
|
|
conn = self._connection
|
||
|
|
path = '/%s:getIamPolicy' % (target_path,)
|
||
|
|
return conn.api_request(method='GET', path=path)
|
||
|
|
|
||
|
|
def set_iam_policy(self, target_path, policy):
|
||
|
|
"""API call: update the IAM policy for the target
|
||
|
|
|
||
|
|
See:
|
||
|
|
https://cloud.google.com/pubsub/reference/rest/v1/projects.topics/setIamPolicy
|
||
|
|
https://cloud.google.com/pubsub/reference/rest/v1/projects.subscriptions/setIamPolicy
|
||
|
|
|
||
|
|
:type target_path: string
|
||
|
|
:param target_path: the path of the target object.
|
||
|
|
|
||
|
|
:type policy: dict
|
||
|
|
:param policy: the new policy resource.
|
||
|
|
|
||
|
|
:rtype: dict
|
||
|
|
:returns: the resource returned by the ``setIamPolicy`` API request.
|
||
|
|
"""
|
||
|
|
conn = self._connection
|
||
|
|
wrapped = {'policy': policy}
|
||
|
|
path = '/%s:setIamPolicy' % (target_path,)
|
||
|
|
return conn.api_request(method='POST', path=path, data=wrapped)
|
||
|
|
|
||
|
|
def test_iam_permissions(self, target_path, permissions):
|
||
|
|
"""API call: test permissions
|
||
|
|
|
||
|
|
See:
|
||
|
|
https://cloud.google.com/pubsub/reference/rest/v1/projects.topics/testIamPermissions
|
||
|
|
https://cloud.google.com/pubsub/reference/rest/v1/projects.subscriptions/testIamPermissions
|
||
|
|
|
||
|
|
:type target_path: string
|
||
|
|
:param target_path: the path of the target object.
|
||
|
|
|
||
|
|
:type permissions: list of string
|
||
|
|
:param permissions: the permissions to check
|
||
|
|
|
||
|
|
:rtype: dict
|
||
|
|
:returns: the resource returned by the ``getIamPolicy`` API request.
|
||
|
|
"""
|
||
|
|
conn = self._connection
|
||
|
|
wrapped = {'permissions': permissions}
|
||
|
|
path = '/%s:testIamPermissions' % (target_path,)
|
||
|
|
resp = conn.api_request(method='POST', path=path, data=wrapped)
|
||
|
|
return resp.get('permissions', [])
|