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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.
# --------------------------------------------------------------------------------------------
"""
Example to show sending message(s) to a Service Bus Queue asynchronously.
WARNING: ServiceBusClient, ServiceBusSender, and ServiceBusMessageBatch are not coroutine-safe.
Do not share these instances between coroutines without proper coroutine-safe management using mechanisms like asyncio.Lock.
"""
import os
import asyncio
from azure.servicebus import ServiceBusMessage
from azure.servicebus.aio import ServiceBusClient
from azure.identity.aio import DefaultAzureCredential
FULLY_QUALIFIED_NAMESPACE = os.environ["SERVICEBUS_FULLY_QUALIFIED_NAMESPACE"]
QUEUE_NAME = os.environ["SERVICEBUS_QUEUE_NAME"]
async def send_single_message(sender):
message = ServiceBusMessage("Single Message")
await sender.send_messages(message)
async def send_a_list_of_messages(sender):
messages = [ServiceBusMessage("Message in list") for _ in range(10)]
await sender.send_messages(messages)
async def send_batch_message(sender):
batch_message = await sender.create_message_batch()
for _ in range(10):
try:
batch_message.add_message(ServiceBusMessage("Message inside a ServiceBusMessageBatch"))
except ValueError:
# ServiceBusMessageBatch object reaches max_size.
# New ServiceBusMessageBatch object can be created here to send more data.
break
await sender.send_messages(batch_message)
async def send_concurrent_with_shared_client_and_lock():
"""
Example showing concurrent sending with a shared client using asyncio.Lock.
"""
send_lock = asyncio.Lock()
servicebus_client = ServiceBusClient(FULLY_QUALIFIED_NAMESPACE, DefaultAzureCredential())
async def send_with_lock(task_id):
try:
# Use lock to ensure coroutine-safe sending
async with send_lock:
sender = servicebus_client.get_queue_sender(queue_name=QUEUE_NAME)
async with sender:
message = ServiceBusMessage(f"Synchronized message from coroutine {task_id}")
await sender.send_messages(message)
print(f"Coroutine {task_id} sent synchronized message successfully")
except Exception as e:
print(f"Coroutine {task_id} failed: {e}")
async with servicebus_client:
# Use asyncio.gather to run coroutines concurrently with lock synchronization
await asyncio.gather(*[send_with_lock(i) for i in range(3)])
async def main():
credential = DefaultAzureCredential()
servicebus_client = ServiceBusClient(FULLY_QUALIFIED_NAMESPACE, credential)
async with servicebus_client:
sender = servicebus_client.get_queue_sender(queue_name=QUEUE_NAME)
async with sender:
await send_single_message(sender)
await send_a_list_of_messages(sender)
await send_batch_message(sender)
print("Send message is done.")
print("\nDemonstrating concurrent sending with shared client and locks...")
await send_concurrent_with_shared_client_and_lock()
asyncio.run(main())
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