python 如何基于paramiko写一个持续交互命令？

使用场景 我需要执行一系列sh命令，这些sh命令有上下依赖关系，比如切换到某个目录，然后再执行其他命令。

需要　　可以实现命令的连续性。

import time
import paramiko
import re

class SSHConnection(object):

    def __init__(self, host_dict):
        self.host = host_dict['host']
        self.port = host_dict['port']
        self.username = host_dict['username']
        self.pwd = host_dict['pwd']

    def connect(self):
        # 连接
        transport = paramiko.Transport((self.host, self.port))
        transport.connect(username=self.username, password=self.pwd)    # 通道建立连接
        self.__transport = transport
        channel = transport.open_session()
        channel.get_pty()
        channel.invoke_shell()
        self.__channel = channel    # 建立持续交互

    def close(self):
        # 关闭
        self.__transport.close()
        self.__channel.close()

    def run_shell(self,command):
        # 执行shell命令,持续交互
        channel = self.__channel        # 获取通道
        channel.send(f'{command}\n')    # 执行命令
        result = ''                     # 存放结果
        while True:                     # 有可能有多行数据 用循环
            time.sleep(0.5)
            res = channel.recv(65535).decode('utf8')
            result += res
            if res.endswith('# ') or res.endswith('$ '):    # 终止条件
                break
        result = re.sub('\x1b.*?m', '', result)     # 移除\xblah[0m这些
        return  result.strip('\n')  # 移除

    def upload(self, local_path, target_path):
        # 连接，上传
        sftp = paramiko.SFTPClient.from_transport(self.__transport)
        # 将location.py 上传至服务器 /home/test.py
        sftp.put(local_path, target_path, confirm=True)
        # 增加权限
        sftp.chmod(target_path, 0o755)  # 注意这里的权限是八进制的，八进制需要使用0o作为前缀

    def download(self, target_path, local_path):
        # 连接，下载
        sftp = paramiko.SFTPClient.from_transport(self.__transport)
        # 将/home/test.py 下载至本地 location.py
        sftp.get(target_path, local_path)

    def __del__(self):
        # 销毁
        # self.close()
        '''下面的代码是为了解决执行中遇到的'NoneType' object has no attribute 'time' 报错'''
        try:
            self.close()
        except Exception as e:
            if str(e) != "'NoneType' object has no attribute 'time'":
                raise

if __name__ == '__main__':
    host_dict={
        "host":"192.168.53.77",
        "port": 22,
        "username": "liqi",
        "pwd": "123456",
    }
    obj = SSHConnection(host_dict=host_dict)    # 实例化
    obj.connect()   # 建立一个终端连接
    print(obj.run_shell('pwd'))
    obj.run_shell('cd liqi')
    print(obj.run_shell('pwd'))
 

 

 

参考资料 

https://www.cnblogs.com/xiao-apple36/p/9144092.html