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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 with checkpoint store doing checkpoint by batch asynchronously.
In the `receive_batch` method of `EventHubConsumerClient`:
If no partition id is specified, the checkpoint_store are used for load-balance and checkpoint.
If partition id is specified, the checkpoint_store can only be used for checkpoint without load balancing.
"""
import asyncio
import os
import logging
from azure.eventhub.aio import EventHubConsumerClient
from azure.eventhub.extensions.checkpointstoreblobaio import BlobCheckpointStore
from azure.identity.aio import DefaultAzureCredential
FULLY_QUALIFIED_NAMESPACE = os.environ["EVENT_HUB_HOSTNAME"]
EVENTHUB_NAME = os.environ["EVENT_HUB_NAME"]
storage_account_name = os.environ["AZURE_STORAGE_ACCOUNT"]
protocol = os.environ.get("PROTOCOL", "https")
suffix = os.environ.get("ACCOUNT_URL_SUFFIX", "core.windows.net")
BLOB_ACCOUNT_URL = f"{protocol}://{storage_account_name}.blob.{suffix}"
BLOB_CONTAINER_NAME = "your-blob-container-name" # Please make sure the blob container resource exists.
logging.basicConfig(level=logging.INFO)
log = logging.getLogger(__name__)
async def batch_process_events(events):
# put your code here
await asyncio.sleep(2) # simulate something I/O bound
async def on_event_batch(partition_context, event_batch):
log.info("Partition {}, Received count: {}".format(partition_context.partition_id, len(event_batch)))
await batch_process_events(event_batch)
await partition_context.update_checkpoint()
async def receive_batch():
checkpoint_store = BlobCheckpointStore(
blob_account_url=BLOB_ACCOUNT_URL, container_name=BLOB_CONTAINER_NAME, credential=DefaultAzureCredential()
)
client = EventHubConsumerClient(
fully_qualified_namespace=FULLY_QUALIFIED_NAMESPACE,
eventhub_name=EVENTHUB_NAME,
credential=DefaultAzureCredential(),
consumer_group="$Default",
checkpoint_store=checkpoint_store,
)
async with client:
await client.receive_batch(
on_event_batch=on_event_batch,
max_batch_size=100,
starting_position="-1", # "-1" is from the beginning of the partition.
)
if __name__ == "__main__":
asyncio.run(receive_batch())
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