python的paramiko模块

下面代码完成了以下功能：

• 扫描可用ip
• 监控指定网卡的状态

#!/usr/bin/python3
import paramiko
import time


class SSHConnection(object):
    # 初始化主机名称、ip、端口等信息
    def __init__(self, hostname, username, password, port=22):
        #ssh相关属性
        self.hostname = hostname
        self.username = username
        self.password = password
        self.port = port
        self.ssh = paramiko.SSHClient()
        #网卡相关属性
        self.ip = ""
        self.status = ""

    # 连接远程服务器
    def connect(self):
        self.ssh.set_missing_host_key_policy(
            paramiko.AutoAddPolicy())  # #####################允许将信任的主机自动加入到host_allow 列表，此方法必须放在connect方法的前面
        self.ssh.connect(hostname=self.hostname, username=self.username, password=self.password, port=self.port)

    # 关闭连接
    def close(self):
        self.ssh.close()

    # 得到ping某台host的平均延迟
    def ping(self, ip):
        ret_ping = self.cmd('ping -c 5 -w 5 ' + ip + r' | grep icmp | egrep -o "[0-9]\.[0-9]*\ ms" | cut -d" " -f1')
        ret_ping = str(ret_ping)[2:-1]
        latencys_str = ret_ping.split(r"\r\n")
        sum_latency = 0.0
        count = 0
        for latency_str in latencys_str:
            if latency_str != '':
                sum_latency += float(str(latency_str))
                count += 1
        if count == 0:
            return 0  # 不可达则返回0
        return round(sum_latency / count, 2)  # 得到平均延迟

    # 判断哪些机器ping可达
    # 这里改成并发会更好
    def detect(self, ip_prefix):
        hosts = {}
        for i in range(1, 255):
            ip = ip_prefix + str(i)
            ret_ping = self.ping(ip)
            if ret_ping != 0:
                hosts[ip] = ret_ping
        # 所有可达机器：
        print("所有可达机器：")
        for host in hosts:
            print(host)
        # 最慢的节点
        n = 5
        if len(hosts) < 5:
            n = len(hosts)
        print("\n最慢的节点：")
        hosts = sorted(hosts.items(), key=lambda x: x[1], reverse=True)
        # print(hosts)    # debug
        for i in range(n):
            print(hosts[i][0], hosts[i][1])

    # 得到网卡的ip和状态
    # 这里只拿ipv4地址了
    def get_nc_status(self,nc_name):
        ip = self.cmd('nmcli device show '+nc_name+" | grep IP4.ADDRESS | awk '{print $2}' | cut -d'/' -f1")
        status = self.cmd("nmcli device show " + nc_name + " | grep GENERAL.STATE | awk '{print $3}'")
        return ip,status

    # 定时检查网卡状态
    def check_nc(self, nc_name, sleep_time):
        self.ip, self.status = self.get_nc_status(nc_name)
        while True:
            time.sleep(sleep_time)
            ip, status = self.get_nc_status(nc_name)
            if self.ip != ip:
                print("ip发生变化，从%s变成了%s" % (self.ip, ip))
                self.ip = ip
                print()
            if self.status != status:
                print("status发生变化，从[%s]变成了[%s]\n" % (self.status, status))
                self.status = status

    # 执行命令
    def cmd(self, command):
        stdin, stdout, stderr = self.ssh.exec_command(command, get_pty=True)
        result = stdout.read()
        return result


if __name__ == '__main__':
    hostname = '172.16.1.131'
    username = 'root'
    password = '1'
    port = 22
    # 连接
    myssh = SSHConnection(hostname, username, password, port)
    try:
        myssh.connect()
    except paramiko.ssh_exception.AuthenticationException as exception:
        print("连接失败:", exception)
    # 机器探测
    # myssh.detect("127.0.0.")

    # 定时检查网卡ip和状态
    # print(myssh.get_nc_status("ens160"))   #debug
    try:
        myssh.check_nc("ens160", 3)
    except KeyboardInterrupt:
        myssh.close()

    # myssh.cmd("pwd")  # 得到b'/root\r\n'