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multiplexed_publisher_client.py
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multiplexed_publisher_client.py
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# Copyright 2020 Google LLC
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
from concurrent.futures import Future
from typing import Callable, Union, Mapping
from google.api_core.exceptions import GoogleAPICallError
from google.cloud.pubsublite.cloudpubsub.internal.client_multiplexer import (
ClientMultiplexer,
)
from google.cloud.pubsublite.cloudpubsub.internal.single_publisher import (
SinglePublisher,
)
from google.cloud.pubsublite.cloudpubsub.publisher_client_interface import (
PublisherClientInterface,
)
from google.cloud.pubsublite.types import TopicPath
from overrides import overrides
PublisherFactory = Callable[[TopicPath], SinglePublisher]
class MultiplexedPublisherClient(PublisherClientInterface):
_publisher_factory: PublisherFactory
_multiplexer: ClientMultiplexer[TopicPath, SinglePublisher]
def __init__(self, publisher_factory: PublisherFactory):
self._publisher_factory = publisher_factory
self._multiplexer = ClientMultiplexer(
lambda topic: self._create_and_start_publisher(topic)
)
@overrides
def publish(
self,
topic: Union[TopicPath, str],
data: bytes,
ordering_key: str = "",
**attrs: Mapping[str, str]
) -> "Future[str]":
if isinstance(topic, str):
topic = TopicPath.parse(topic)
try:
publisher = self._multiplexer.get_or_create(topic)
except GoogleAPICallError as e:
failed = Future()
failed.set_exception(e)
return failed
future = publisher.publish(data=data, ordering_key=ordering_key, **attrs)
future.add_done_callback(
lambda fut: self._on_future_completion(topic, publisher, fut)
)
return future
def _create_and_start_publisher(self, topic: Union[TopicPath, str]):
publisher = self._publisher_factory(topic)
try:
return publisher.__enter__()
except GoogleAPICallError:
publisher.__exit__(None, None, None)
raise
def _on_future_completion(
self, topic: TopicPath, publisher: SinglePublisher, future: "Future[str]"
):
try:
future.result()
except GoogleAPICallError:
self._multiplexer.try_erase(topic, publisher)
@overrides
def __enter__(self):
self._multiplexer.__enter__()
return self
@overrides
def __exit__(self, exc_type, exc_value, traceback):
self._multiplexer.__exit__(exc_type, exc_value, traceback)