Question

我有兴趣从Python脚本中侦听事件中心，并在检测到入站邮件时执行一些代码。

在Ubuntu上，使用带有https://pypi.python.org/pypi/python-qpid-proton/0.10的Python 2.7和示例“receiver”脚本，我尝试订阅一个看起来像这样的URI：

amqps://<key name>:<key>@<namespace>.servicebus.windows.net/<event hub name>/ConsumerGroups/$Default/Partitions/0

返回以下错误：

proton.MessengerException: Cannot subscribe to <...>

我相信我的事件中心设置正确，因为我能够使用单独的“发送”脚本向其发送事件，Azure仪表板显示事件已到达。但我无法作为订阅者连接以接收消息。

Answer 1

我尝试在Ubuntu Server上重现您的问题，但失败了。

虽然您说正确设置了您的活动中心，但我仍然建议您查看key name＆amp;再次通过Azure旧门户网站上事件中心的key标签页，CONFIGURE确保在key name中定义了具有权限Listen的政策名称Shared access policies }。或者您可以使用RootManageSharedAccessKey＆amp;它是您服务总线的访问连接信息的关键，可以再试一次。

此外，您可以参考https://gist.github.com/tomconte/e2a4667185a9bf674f59上的示例event_hubs_receive_many.py（基于https://qpid.apache.org/releases/qpid-proton-0.8/messenger/python/examples/async.py.html处的质子样本async.py）来检查您的代码。

Answer 2

pypi上有一个更新版本的azure-eventhub Python SDK v5。

您可以按照recv sample接收消息：

#!/usr/bin/env python

# --------------------------------------------------------------------------------------------
# Copyright (c) Microsoft Corporation. All rights reserved.
# Licensed under the MIT License. See License.txt in the project root for license information.
# --------------------------------------------------------------------------------------------

"""
An example to show receiving events from an Event Hub.
"""
import os
from azure.eventhub import EventHubConsumerClient

CONNECTION_STR = os.environ["EVENT_HUB_CONN_STR"]
EVENTHUB_NAME = os.environ['EVENT_HUB_NAME']


def on_event(partition_context, event):
    # Put your code here.
    # If the operation is i/o intensive, multi-thread will have better performance.
    print("Received event from partition: {}.".format(partition_context.partition_id))


def on_partition_initialize(partition_context):
    # Put your code here.
    print("Partition: {} has been initialized.".format(partition_context.partition_id))


def on_partition_close(partition_context, reason):
    # Put your code here.
    print("Partition: {} has been closed, reason for closing: {}.".format(
        partition_context.partition_id,
        reason
    ))


def on_error(partition_context, error):
    # Put your code here. partition_context can be None in the on_error callback.
    if partition_context:
        print("An exception: {} occurred during receiving from Partition: {}.".format(
            partition_context.partition_id,
            error
        ))
    else:
        print("An exception: {} occurred during the load balance process.".format(error))


if __name__ == '__main__':
    consumer_client = EventHubConsumerClient.from_connection_string(
        conn_str=CONNECTION_STR,
        consumer_group='$Default',
        eventhub_name=EVENTHUB_NAME,
    )

    try:
        with consumer_client:
            consumer_client.receive(
                on_event=on_event,
                on_partition_initialize=on_partition_initialize,
                on_partition_close=on_partition_close,
                on_error=on_error,
                starting_position="-1",  # "-1" is from the beginning of the partition.
            )
    except KeyboardInterrupt:
        print('Stopped receiving.')

如果您已经在使用v1 SDK，则可以按照migration from v1 to v5来迁移程序。

Answer 3

查看https://github.com/Azure/azure-event-hubs-python

尝试./examples/recv.py查看是否有效。请注意，SAS密钥需要进行URL编码，并且关联的策略已定义了Listen操作。需要从事件中心配置更新ADDRESS。

订阅/收听Azure Event Hub的python脚本？

3 个答案: