How do you implement RPC pattern with RabbitMQ?

RabbitMQ can emulate request/response (RPC) even though it is fundamentally an asynchronous system, using two message properties: reply_to and correlation_id.

1. The client declares a private, typically exclusive, reply queue and starts consuming from it.
2. The client publishes the request, setting reply_to to that queue's name and correlation_id to a unique value it generates.
3. The server processes the request and publishes the response directly to the queue named in reply_to, copying the same correlation_id back.
4. The client matches the incoming response to its original request using the correlation_id, since multiple in-flight requests can share the same reply queue.

props = pika.BasicProperties(reply_to=callback_queue, correlation_id=corr_id)
channel.basic_publish(exchange='', routing_key='rpc_queue', properties=props, body=request)

This pattern trades true RPC latency for the resilience of a message broker, so it suits cases where decoupling and retries matter more than raw round-trip speed.

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