/
single_publisher.py
72 lines (57 loc) · 2.3 KB
/
single_publisher.py
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
# 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 typing import AsyncContextManager, Mapping, ContextManager
from concurrent import futures
class AsyncSinglePublisher(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 MessageMetadata.decode.
Raises:
GoogleApiCallError: On a permanent failure.
"""
class SinglePublisher(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 MessageMetadata.decode.
Raises:
GoogleApiCallError: On a permanent failure.
"""