🐇📡 RabbitMQ RPC Client

rabbitmq_rpc is a powerful Python package that simplifies the implementation of RPC (Remote Procedure Call) patterns in event-driven microservices. Built on top of the aio-pika library, it abstracts the complexities of asynchronous communication with RabbitMQ, providing a seamless and efficient experience for developers.

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✨ Features

• 🚀 Asynchronous RPC Client: Fully built on aio-pika, enabling non-blocking inter-service communication.
• 🌐 Distributed Environment Ready: Effortlessly connects services across containers and different URLs.
• 📜 Event Registration & Handling: Easily define, register, and handle events with custom event handlers.
• 🛠️ Customizable RPC Protocol: Supports any subclass of aio_pika.patterns.RPC for tailored RPC interactions.
• 🔒 Thread-Safe Connection: Utilizes a singleton design pattern to maintain a single instance of the RPC client across threads.
• ⏱️ Retry & Timeout Mechanism: Built-in support for retrying failed calls and handling timeouts with with_retry_and_timeout.
• 🛠️ No Server-side Implementation Required: Just a running RabbitMQ server—no need for additional RPC server implementations.

📦 Installation

Get started by installing rabbitmq_rpc using pip:

pip install git+https://github.com/deepmancer/rabbitmq-rpc.git

🛠️ Quick Start

🎯 Registering Events

In Service 1, define event handlers and register them with the RPCClient using the register_event method:

import asyncio
from rabbitmq_rpc import RPCClient

async def handler_addition(x, y):
    return x + y

async def handle_subtraction(x, y):
    return x - y

async def handle_multiplication(x, y):
    return x * y

async def handle_division(x, y):
    return x / y

async def main():
    # Initialize RPC client
    rpc_client = await RPCClient.create(
        host='localhost',
        port=5920,
        user='rabbitmq_user',
        password='rabbitmq_password',
        vhost='/',
        ssl=False,
    )

    # Register event handlers
    await rpc_client.register_event('service1.addition', handler_addition)
    await rpc_client.register_event('service1.subtraction', handle_subtraction)
    await rpc_client.register_event('service1.multiplication', handle_multiplication)
    await rpc_client.register_event('service1.division', handle_division)
    
    # Keep listening for events
    await asyncio.Future()

if __name__ == '__main__':
    loop = asyncio.get_event_loop()
    loop.run_until_complete(main())

📞 Calling Events

In Service 2, invoke the events defined in Service 1:

import asyncio
from rabbitmq_rpc import RPCClient

async def main():
    # Initialize RPC client
    rpc_client = await RPCClient.create(
        host='localhost',
        port=5920,
        user='rabbitmq_user',
        password='rabbitmq_password',
        vhost='/',
        ssl=False,
    )
    
    # Call service1 events
    add_result = await rpc_client.call('service1.addition', data={"x": 1, "y": 2})
    print(f"Addition Result: {add_result}")

    sub_result = await rpc_client.call('service1.subtraction', data={"x": 1, "y": 2})
    print(f"Subtraction Result: {sub_result}")

    mul_result = await rpc_client.call('service1.multiplication', data={"x": 1, "y": 2})
    print(f"Multiplication Result: {mul_result}")

    # Call with timeout and retry mechanism
    div_result = await rpc_client.call('service1.division', data={"x": 5, "y": 2}, timeout=10, retry_count=3)
    print(f"Division Result: {div_result}")

    # Send event without waiting for a response
    rpc_client.send('service1.multiplication', data={"x": 1, "y": 2})    

if __name__ == '__main__':
    loop = asyncio.get_event_loop()
    loop.run_until_complete(main())

🛡️ Error Handling

rabbitmq_rpc provides custom exceptions to handle various connection and RPC-related issues:

• ConnectionError
• RPCError
• EventRegistrationError
• EventPublishError
• EventSubscribeError

🔌 Disconnecting

Gracefully disconnect from RabbitMQ when you're done:

await rpc_client.close()

📄 License

This project is licensed under the Apache License 2.0. For more details, see the LICENSE file.

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Elevate your microservices communication with rabbitmq_rpc today! 🐇📡