# coding=utf-8
import pika
import uuid


class FibonacciRpcClient(object):

    def __init__(self):
        self.connection = pika.BlockingConnection(
            pika.ConnectionParameters(host='localhost'))
        self.channel = self.connection.channel()

        result = self.channel.queue_declare(exclusive=True)
        self.callback_queue = result.method.queue
        self.channel.basic_consume(
            self.on_response, no_ack=True, queue=self.callback_queue)

    def on_response(self, ch, method, props, body):
        if self.corr_id == props.correlation_id:
            self.response = body

    def call(self, n):
        self.response = None
        self.corr_id = str(uuid.uuid4())
        self.channel.basic_publish(exchange='',
                                   routing_key='rpc_queue',
                                   properties=pika.BasicProperties
                                   (
                                       reply_to=self.callback_queue,
                                       correlation_id=self.corr_id
                                   ),
                                   body=str(n)
                                   )

        while self.response is None:
            self.connection.process_data_events()
        return int(self.response)

fibonacci_rpc = FibonacciRpcClient()
print("[x] Requesting fib(40)")
response = fibonacci_rpc.call(40)
print("[.] Got {}".format(response))