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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 asynchronously.
"""
import asyncio
import os
from azure.eventhub.aio import EventHubConsumerClient
CONNECTION_STR = os.environ["EVENT_HUB_CONN_STR"]
EVENTHUB_NAME = os.environ['EVENT_HUB_NAME']
async def on_event(partition_context, event):
# Put your code here.
# If the operation is i/o intensive, async will have better performance.
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.from_connection_string(
conn_str=CONNECTION_STR,
consumer_group="$default",
eventhub_name=EVENTHUB_NAME
)
async with client:
await 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.
)
if __name__ == '__main__':
asyncio.run(main())
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