Python类和SSH连接不能很好地工作

Question

考虑下面的代码：

class sshConnection(): 
     def getConnection(self,IP,USN,PSW): 
     try: 
      client = paramiko.SSHClient() 
      client.set_missing_host_key_policy(paramiko.AutoAddPolicy()) 
      client.connect(IP,username=USN, password=PSW) 
      channel = client.invoke_shell() 
      t = channel.makefile('wb') 
      stdout = channel.makefile('rb') 
      print t //The important lines 
      return t //The important lines 
     except: 
      return -1 

    myConnection=sshConnection().getConnection("xx.xx.xx.xx","su","123456") 
    print myConnection 

结果：

<paramiko.ChannelFile from <paramiko.Channel 1 (open) window=1000 ->  <paramiko.Transport at 0xfcc990L (cipher aes128-ctr, 128 bits) (active; 1 open channel(s))>>> 

<paramiko.ChannelFile from <paramiko.Channel 1 (closed) -> <paramiko.Transport at 0xfcc930L (unconnected)>>> 

这意味着：在类方法中，t连接点连接，但回国后这个连接描述符，连接丢失。

这是为什么，我该如何使它工作？

谢谢！

Answer 1

您必须返回并存储某处client和channel变量。只要t生活，他们应该保持活着，但显然paramiko不遵守Python约定。

Answer 2

当方法返回时，您的客户端将超出范围，并且会自动关闭通道文件。尝试将客户端存储为成员，并保留sshConnection，直到完成客户端，就像这样;

import paramiko 

class sshConnection(): 
    def getConnection(self,IP,USN,PSW): 
     try: 
      self.client = paramiko.SSHClient() 
      self.client.set_missing_host_key_policy(paramiko.AutoAddPolicy()) 
      self.client.connect(IP,username=USN, password=PSW) 
      channel = self.client.invoke_shell() 
      self.stdin = channel.makefile('wb') 
      self.stdout = channel.makefile('rb') 
      print self.stdin # The important lines 
      return 0 # The important lines 
     except: 
      return -1 

conn = sshConnection() 
print conn.getConnection("ubuntu-vm","ic","out69ets") 
print conn.stdin 


$ python test.py 
<paramiko.ChannelFile from <paramiko.Channel 1 (open) window=2097152 -> <paramiko.Transport at 0xb3abcd0L (cipher aes128-ctr, 128 bits) (active; 1 open channel(s))>>> 
<paramiko.ChannelFile from <paramiko.Channel 1 (open) window=2097152 -> <paramiko.Transport at 0xb3abcd0L (cipher aes128-ctr, 128 bits) (active; 1 open channel(s))>>> 

当然，清理了一点东西，你可能希望隐藏标准输入/输出并通过sshConnection其他方法用它们来代替，这样你就只需要保留的，与其多个轨道文件和一个连接。