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#!/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 for a period of time asynchronously.
"""
import asyncio
import os
import time
from azure.eventhub.aio import EventHubConsumerClient
from azure.identity.aio import DefaultAzureCredential
FULLY_QUALIFIED_NAMESPACE = os.environ["EVENT_HUB_HOSTNAME"]
EVENTHUB_NAME = os.environ["EVENT_HUB_NAME"]
RECEIVE_DURATION = 15
async def on_event(partition_context, event):
# Put your code here.
print("Received event from partition: {}.".format(partition_context.partition_id))
await partition_context.update_checkpoint(event)
async def on_partition_initialize(partition_context):
# Put your code here.
print("Partition: {} has been initialized.".format(partition_context.partition_id))
async 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))
async 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))
async def main():
client = EventHubConsumerClient(
fully_qualified_namespace=FULLY_QUALIFIED_NAMESPACE,
eventhub_name=EVENTHUB_NAME,
credential=DefaultAzureCredential(),
consumer_group="$default",
)
print("Consumer will keep receiving for {} seconds, start time is {}.".format(RECEIVE_DURATION, time.time()))
async with client:
task = asyncio.ensure_future(
client.receive(
on_event=on_event,
on_error=on_error,
on_partition_close=on_partition_close,
on_partition_initialize=on_partition_initialize,
starting_position="-1", # "-1" is from the beginning of the partition.
)
)
await asyncio.sleep(RECEIVE_DURATION)
await task
print("Consumer has stopped receiving, end time is {}.".format(time.time()))
if __name__ == "__main__":
asyncio.run(main())
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