How to Stop Receiving Requests Until Ready in Python

import random
import time


class MockServer:
    def __init__(self):
        self.ready = False
        self.requests_received = 0

    def readiness_check(self):
        """Simulates a readiness probe. Returns True only when ready."""
        if not self.ready:
            return False
        return True

    def receive_request(self):
        """Simulates receiving a request. Fails when not ready."""
        if not self.readiness_check():
            raise ConnectionRefusedError("Server not ready to accept requests")
        self.requests_received += 1
        return f"Request #{self.requests_received} processed"

    def set_ready(self):
        """Mark server as ready, simulating a startup or recovery."""
        self.ready = True


if __name__ == "__main__":
    server = MockServer()

    # Attempt to receive a request before readiness
    try:
        server.receive_request()
    except ConnectionRefusedError as e:
        print(e)

    # Simulate delayed startup
    server.set_ready()
    print(server.receive_request())
    print(server.receive_request())