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#!/usr/bin/env python3
# -*- coding: utf-8 -*-
import time
import psutil
import random
from Utils.Logger import logger
def getAvailablePort(rangeStart: int = 1024, rangeEnd: int = 65535, msWait: int = 10) -> int: # found a available port
if rangeStart > rangeEnd or rangeStart < 1 or rangeEnd > 65535: # port range check
raise RuntimeError('Invalid port range')
while True:
port = random.randint(rangeStart, rangeEnd) # choose randomly
if isVacantPort(port):
logger.debug('Found new available port -> %i' % port)
return port
time.sleep(msWait / 1000) # ms -> s (default 10ms)
def isVacantPort(port: int) -> bool: # whether the port is occupied
for connection in networkStatus(): # scan every connections
if connection['local']['port'] == port: # port occupied (ipv4-tcp / ipv4-udp / ipv6-tcp / ipv6-udp)
logger.debug('Check port %i -> occupied' % port)
return False
logger.debug('Check port %i -> available' % port) # vacant port
return True
def networkStatus() -> list: # get all network connections
result = []
for connection in psutil.net_connections():
if not connection.family.name.startswith('AF_INET'): # AF_INET / AF_INET6
continue
if connection.type.name not in ['SOCK_STREAM', 'SOCK_DGRAM']: # TCP / UDP
continue
result.append({
'fd': connection.fd,
'family': 'ipv6' if connection.family.name[-1] == '6' else 'ipv4', # ip version
'type': 'tcp' if connection.type.name == 'SOCK_STREAM' else 'udp', # tcp or udp
'local': { # local bind address
'addr': connection.laddr.ip,
'port': connection.laddr.port,
},
'remote': { # remote address
'addr': connection.raddr.ip,
'port': connection.raddr.port,
} if len(connection.raddr) != 0 else None,
'status': connection.status,
'pid': connection.pid, # process id
})
logger.debug('Network status -> found %i connections' % len(result))
return result