/
publisher.py
58 lines (44 loc) · 1.64 KB
/
publisher.py
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from abc import abstractmethod
from typing import AsyncContextManager, Mapping, ContextManager
from concurrent import futures
class AsyncPublisher(AsyncContextManager):
"""
An AsyncPublisher publishes messages similar to Google Pub/Sub, but must be used in an
async context. Any publish failures are permanent.
Must be used in an `async with` block or have __aenter__() awaited before use.
"""
@abstractmethod
async def publish(
self, data: bytes, ordering_key: str = "", **attrs: Mapping[str, str]
) -> str:
"""
Publish a message.
Args:
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 PublishMetadata.decode.
Raises:
GoogleApiCallError: On a permanent failure.
"""
class Publisher(ContextManager):
"""
A Publisher publishes messages similar to Google Pub/Sub. Any publish failures are permanent.
Must be used in a `with` block or have __enter__() called before use.
"""
@abstractmethod
def publish(
self, data: bytes, ordering_key: str = "", **attrs: Mapping[str, str]
) -> "futures.Future[str]":
"""
Publish a message.
Args:
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, which can be decoded using PublishMetadata.decode.
Raises:
GoogleApiCallError: On a permanent failure.
"""