/
publisher_client_interface.py
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/
publisher_client_interface.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 abc import abstractmethod
from concurrent.futures import Future
from typing import ContextManager, Mapping, Union, AsyncContextManager
from google.cloud.pubsublite.types import TopicPath
class AsyncPublisherClientInterface(AsyncContextManager):
"""
An AsyncPublisherClientInterface publishes messages similar to Google Pub/Sub, but must be used in an
async context. Any publish failures are unlikely to succeed if retried.
Must be used in an `async with` block or have __aenter__() awaited before use.
"""
@abstractmethod
async def publish(
self,
topic: Union[TopicPath, str],
data: bytes,
ordering_key: str = "",
**attrs: Mapping[str, str],
) -> str:
"""
Publish a message.
Args:
topic: The topic to publish to. Publishes to new topics may have nontrivial startup latency.
data: The bytestring payload of the message
ordering_key: The key to enforce ordering on, or "" for no ordering.
**attrs: Additional attributes to send.
Returns:
An ack id, which can be decoded using MessageMetadata.decode.
Raises:
GoogleApiCallError: On a permanent failure.
"""
class PublisherClientInterface(ContextManager):
"""
A PublisherClientInterface publishes messages similar to Google Pub/Sub.
Any publish failures are unlikely to succeed if retried.
Must be used in a `with` block or have __enter__() called before use.
"""
@abstractmethod
def publish(
self,
topic: Union[TopicPath, str],
data: bytes,
ordering_key: str = "",
**attrs: Mapping[str, str],
) -> Future:
"""
Publish a message.
Args:
topic: The topic to publish to. Publishes to new topics may have nontrivial startup latency.
data: The bytestring payload of the message
ordering_key: The key to enforce ordering on, or "" for no ordering.
**attrs: Additional attributes to send.
Returns:
A future completed with an ack id of type str, which can be decoded using
MessageMetadata.decode.
Raises:
GoogleApiCallError: On a permanent failure.
"""