Crossbar.io WebSocket Server Setup

This function sets up a WebSocket server using Crossbar.io. It listens for incoming WebSocket connections on the specified URI and calls the respective callback functions upon receiving a message or an error.

Technology Stack : Crossbar.io, WebSocket

Code Type : WebSocket Server

Code Difficulty : Intermediate

                
                    
def crossbar_websocket_server(uri, on_message, on_error):
    """
    This function sets up a WebSocket server using Crossbar.io.

    Args:
        uri (str): The URI to listen on for incoming WebSocket connections.
        on_message (function): A callback function to be called when a message is received.
        on_error (function): A callback function to be called when an error occurs.

    Returns:
        None
    """
    import crossbar
    from crossbar.worker import Worker

    # Create a new Crossbar worker
    worker = Worker()

    # Define the WebSocket resource
    worker.add_resource(
        '/ws',
        lambda req: crossbar.resource.WebSocketResource(
            on_message=on_message,
            on_error=on_error
        )(req)
    )

    # Start the worker
    worker.run()

# Example usage
def example_message_handler(message):
    print(f"Received message: {message}")

def example_error_handler(error):
    print(f"Error occurred: {error}")

# Starting the WebSocket server
# crossbar_websocket_server("ws://localhost:8000/ws", example_message_handler, example_error_handler)