503 lines
19 KiB
Python
503 lines
19 KiB
Python
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# Copyright 2016 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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"""GAX wrapper for Pubsub API requests."""
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# pylint: disable=import-error
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from google.gax import CallOptions
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from google.gax import INITIAL_PAGE
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from google.gax.errors import GaxError
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from google.gax.grpc import exc_to_code
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from google.pubsub.v1.pubsub_pb2 import PubsubMessage
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from google.pubsub.v1.pubsub_pb2 import PushConfig
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from grpc.beta.interfaces import StatusCode
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# pylint: enable=import-error
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from gcloud.exceptions import Conflict
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from gcloud.exceptions import NotFound
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from gcloud._helpers import _to_bytes
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def _build_paging_options(page_token=None):
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"""Helper for :meth:'_PublisherAPI.list_topics' et aliae."""
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if page_token is None:
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page_token = INITIAL_PAGE
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options = {'page_token': page_token}
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return CallOptions(**options)
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class _PublisherAPI(object):
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"""Helper mapping publisher-related APIs.
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:type gax_api: :class:`google.pubsub.v1.publisher_api.PublisherApi`
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:param gax_api: API object used to make GAX requests.
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"""
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def __init__(self, gax_api):
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self._gax_api = gax_api
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def list_topics(self, project, page_size=0, page_token=None):
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"""List topics for the project associated with this API.
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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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options = _build_paging_options(page_token)
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path = 'projects/%s' % (project,)
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page_iter = self._gax_api.list_topics(
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path, page_size=page_size, options=options)
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topics = [{'name': topic_pb.name} for topic_pb in page_iter.next()]
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token = page_iter.page_token or None
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return topics, token
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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: 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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:raises: :exc:`gcloud.exceptions.Conflict` if the topic already
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exists
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"""
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try:
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topic_pb = self._gax_api.create_topic(topic_path)
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except GaxError as exc:
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if exc_to_code(exc.cause) == StatusCode.FAILED_PRECONDITION:
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raise Conflict(topic_path)
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raise
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return {'name': topic_pb.name}
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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: 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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:raises: :exc:`gcloud.exceptions.NotFound` if the topic does not
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exist
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"""
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try:
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topic_pb = self._gax_api.get_topic(topic_path)
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except GaxError as exc:
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if exc_to_code(exc.cause) == StatusCode.NOT_FOUND:
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raise NotFound(topic_path)
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raise
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return {'name': topic_pb.name}
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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/create
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:type topic_path: string
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:param topic_path: 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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try:
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self._gax_api.delete_topic(topic_path)
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except GaxError as exc:
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if exc_to_code(exc.cause) == StatusCode.NOT_FOUND:
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raise NotFound(topic_path)
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raise
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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: 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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:raises: :exc:`gcloud.exceptions.NotFound` if the topic does not
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exist
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"""
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options = CallOptions(is_bundling=False)
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message_pbs = [_message_pb_from_dict(message)
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for message in messages]
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try:
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result = self._gax_api.publish(topic_path, message_pbs,
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options=options)
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except GaxError as exc:
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if exc_to_code(exc.cause) == StatusCode.NOT_FOUND:
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raise NotFound(topic_path)
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raise
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return result.message_ids
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def topic_list_subscriptions(self, topic_path, page_size=0,
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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: 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 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: 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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:raises: :exc:`gcloud.exceptions.NotFound` if the topic does not
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exist
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"""
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options = _build_paging_options(page_token)
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try:
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page_iter = self._gax_api.list_topic_subscriptions(
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topic_path, page_size=page_size, options=options)
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except GaxError as exc:
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if exc_to_code(exc.cause) == StatusCode.NOT_FOUND:
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raise NotFound(topic_path)
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raise
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subs = page_iter.next()
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token = page_iter.page_token or None
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return subs, token
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class _SubscriberAPI(object):
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"""Helper mapping subscriber-related APIs.
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:type gax_api: :class:`google.pubsub.v1.publisher_api.SubscriberApi`
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:param gax_api: API object used to make GAX requests.
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"""
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def __init__(self, gax_api):
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self._gax_api = gax_api
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def list_subscriptions(self, project, page_size=0, page_token=None):
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"""List subscriptions for the project associated with this API.
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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 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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options = _build_paging_options(page_token)
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path = 'projects/%s' % (project,)
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page_iter = self._gax_api.list_subscriptions(
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path, page_size=page_size, options=options)
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subscriptions = [_subscription_pb_to_mapping(sub_pb)
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for sub_pb in page_iter.next()]
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token = page_iter.page_token or None
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return subscriptions, token
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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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if push_endpoint is not None:
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push_config = PushConfig(push_endpoint=push_endpoint)
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else:
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push_config = None
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if ack_deadline is None:
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ack_deadline = 0
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try:
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sub_pb = self._gax_api.create_subscription(
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subscription_path, topic_path, push_config, ack_deadline)
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except GaxError as exc:
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if exc_to_code(exc.cause) == StatusCode.FAILED_PRECONDITION:
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raise Conflict(topic_path)
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raise
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return _subscription_pb_to_mapping(sub_pb)
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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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try:
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sub_pb = self._gax_api.get_subscription(subscription_path)
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except GaxError as exc:
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if exc_to_code(exc.cause) == StatusCode.NOT_FOUND:
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raise NotFound(subscription_path)
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raise
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return _subscription_pb_to_mapping(sub_pb)
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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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try:
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self._gax_api.delete_subscription(subscription_path)
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except GaxError as exc:
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if exc_to_code(exc.cause) == StatusCode.NOT_FOUND:
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raise NotFound(subscription_path)
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raise
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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>``.
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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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"""
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push_config = PushConfig(push_endpoint=push_endpoint)
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try:
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self._gax_api.modify_push_config(subscription_path, push_config)
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except GaxError as exc:
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if exc_to_code(exc.cause) == StatusCode.NOT_FOUND:
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raise NotFound(subscription_path)
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raise
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|
||
|
|
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.
|
||
|
|
"""
|
||
|
|
try:
|
||
|
|
response_pb = self._gax_api.pull(
|
||
|
|
subscription_path, max_messages, return_immediately)
|
||
|
|
except GaxError as exc:
|
||
|
|
if exc_to_code(exc.cause) == StatusCode.NOT_FOUND:
|
||
|
|
raise NotFound(subscription_path)
|
||
|
|
raise
|
||
|
|
return [_received_message_pb_to_mapping(rmpb)
|
||
|
|
for rmpb in response_pb.received_messages]
|
||
|
|
|
||
|
|
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
|
||
|
|
"""
|
||
|
|
try:
|
||
|
|
self._gax_api.acknowledge(subscription_path, ack_ids)
|
||
|
|
except GaxError as exc:
|
||
|
|
if exc_to_code(exc.cause) == StatusCode.NOT_FOUND:
|
||
|
|
raise NotFound(subscription_path)
|
||
|
|
raise
|
||
|
|
|
||
|
|
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.
|
||
|
|
"""
|
||
|
|
try:
|
||
|
|
self._gax_api.modify_ack_deadline(
|
||
|
|
subscription_path, ack_ids, ack_deadline)
|
||
|
|
except GaxError as exc:
|
||
|
|
if exc_to_code(exc.cause) == StatusCode.NOT_FOUND:
|
||
|
|
raise NotFound(subscription_path)
|
||
|
|
raise
|
||
|
|
|
||
|
|
|
||
|
|
def _message_pb_from_dict(message):
|
||
|
|
"""Helper for :meth:`_PublisherAPI.topic_publish`."""
|
||
|
|
return PubsubMessage(data=_to_bytes(message['data']),
|
||
|
|
attributes=message['attributes'])
|
||
|
|
|
||
|
|
|
||
|
|
def _subscription_pb_to_mapping(sub_pb):
|
||
|
|
"""Helper for :meth:`list_subscriptions`, et aliae
|
||
|
|
|
||
|
|
Ideally, would use a function from :mod:`protobuf.json_format`, but
|
||
|
|
the right one isn't public. See:
|
||
|
|
https://github.com/google/protobuf/issues/1351
|
||
|
|
"""
|
||
|
|
mapping = {
|
||
|
|
'name': sub_pb.name,
|
||
|
|
'topic': sub_pb.topic,
|
||
|
|
'ackDeadlineSeconds': sub_pb.ack_deadline_seconds,
|
||
|
|
}
|
||
|
|
if sub_pb.push_config.push_endpoint != '':
|
||
|
|
mapping['pushConfig'] = {
|
||
|
|
'pushEndpoint': sub_pb.push_config.push_endpoint,
|
||
|
|
}
|
||
|
|
return mapping
|
||
|
|
|
||
|
|
|
||
|
|
def _message_pb_to_mapping(message_pb):
|
||
|
|
"""Helper for :meth:`pull`, et aliae
|
||
|
|
|
||
|
|
Ideally, would use a function from :mod:`protobuf.json_format`, but
|
||
|
|
the right one isn't public. See:
|
||
|
|
https://github.com/google/protobuf/issues/1351
|
||
|
|
"""
|
||
|
|
return {
|
||
|
|
'messageId': message_pb.message_id,
|
||
|
|
'data': message_pb.data,
|
||
|
|
'attributes': message_pb.attributes,
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
def _received_message_pb_to_mapping(received_message_pb):
|
||
|
|
"""Helper for :meth:`pull`, et aliae
|
||
|
|
|
||
|
|
Ideally, would use a function from :mod:`protobuf.json_format`, but
|
||
|
|
the right one isn't public. See:
|
||
|
|
https://github.com/google/protobuf/issues/1351
|
||
|
|
"""
|
||
|
|
return {
|
||
|
|
'ackId': received_message_pb.ack_id,
|
||
|
|
'message': _message_pb_to_mapping(
|
||
|
|
received_message_pb.message),
|
||
|
|
}
|