Python類和SSH連接不能很好地工作

Question

考慮下面的代碼：

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 

結果：

<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)>>> 

這意味着：在類方法中，t連接點連接，但回國後這個連接描述符，連接丟失。

這是爲什麼，我該如何使它工作？

謝謝！

Answer 1

您必須返回並存儲某處client和channel變量。只要t生活，他們應該保持活着，但顯然paramiko不遵守Python約定。

Answer 2

當方法返回時，您的客戶端將超出範圍，並且會自動關閉通道文件。嘗試將客戶端存儲爲成員，並保留sshConnection，直到完成客戶端，就像這樣;

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))>>> 

當然，清理了一點東西，你可能希望隱藏標準輸入/輸出並通過sshConnection其他方法用它們來代替，這樣你就只需要保留的，與其多個軌道文件和一個連接。