portend

import portend import socket import time def demo_port_usage(): # Example: Wait for an occupied port (e.g., a simple server) # Start a dummy server in a separate thread/process for this to work # For demonstration, we'll simulate a server binding/unbinding # Find a free port s = socket.socket(socket.AF_INET, socket.SOCK_STREAM) s.bind(('localhost', 0)) port = s.getsockname()[1] s.close() print(f"Found a free port: {port}") # Simulate a process binding to the port server_socket = socket.socket(socket.AF_INET, socket.SOCK_STREAM) server_socket.bind(('localhost', port)) server_socket.listen(1) print(f"Server bound to localhost:{port}") # Use portend to wait for the port to be occupied print(f"Waiting for localhost:{port} to be occupied (max 5s)...") try: portend.occupied('localhost', port, timeout=5) print(f"Success: localhost:{port} is occupied.") except portend.Timeout: # Removed the direct import for Timeout as it's an attribute of portend module and was causing an error. print(f"Error: Timeout waiting for localhost:{port} to be occupied.") finally: server_socket.close() print(f"Server unbound from localhost:{port}") # Use portend to wait for the port to be free print(f"Waiting for localhost:{port} to be free (max 5s)...") try: portend.free('localhost', port, timeout=5) print(f"Success: localhost:{port} is free.") except portend.Timeout: print(f"Error: Timeout waiting for localhost:{port} to be free.") demo_port_usage()