ssh keepalive

[loial]

I have a problem with a ssh connection in python

I get the error

'NoneType' object has no attribute 'exec_command'

I am thinking that maybe the ssh connection is timeing out.

Since I have no control over the configuration of the ssh server(which
is AIX 5.23), is there anything I can do in python to ensure that the
ssh session does not timeout?

[Lie Ryan]

Re: ssh keepalive

On Wed, 01 Oct 2008 00:30:59 -0700, loial wrote:

I have a problem with a ssh connection in python
>
I get the error
>
'NoneType' object has no attribute 'exec_command'
>
I am thinking that maybe the ssh connection is timeing out.
>
Since I have no control over the configuration of the ssh server(which
is AIX 5.23), is there anything I can do in python to ensure that the
ssh session does not timeout?

No, it's a NoneType object (i.e. your variable contains None)
Show us a bit of your code, so we can see why is None there.

My guess is that you're trying to perform something on a function that
does things in-place and doesn't return anything (e.g. list.append,
list.sort)

>>a = [1, 3, 4, 2]
>>a = a.sort()
>>print a

[None, None, None, None]

>># should be
>>a = [1, 3, 4, 2]
>>a.sort()
>>print a

[1, 2, 3, 4]

[Marc 'BlackJack' Rintsch]

Re: ssh keepalive

On Wed, 01 Oct 2008 08:07:43 +0000, Lie Ryan wrote:

>>>a = [1, 3, 4, 2]
>>>a = a.sort()
>>>print a

[None, None, None, None]

*That* would be really odd. The last line should be just a singel `None`
and not a list. :-)

Ciao,
Marc 'BlackJack' Rintsch

[Lie Ryan]

Re: ssh keepalive

On Wed, 01 Oct 2008 10:47:28 +0000, Marc 'BlackJack' Rintsch wrote:

On Wed, 01 Oct 2008 08:07:43 +0000, Lie Ryan wrote:
>

>>>>a = [1, 3, 4, 2]
>>>>a = a.sort()
>>>>print a

>[None, None, None, None]

>
*That* would be really odd. The last line should be just a singel
`None` and not a list. :-)
>
Ciao,
Marc 'BlackJack' Rintsch

Ah yeah, I originally intended to give a list of list example, but
changed mind and forgot to change that last line.

[loial]

Re: ssh keepalive

<<Show us a bit of your code, so we can see why is None there.>>

def command ( self , command ) :
""" process requested command through ssh """
print command
if not self._connected :
return False , "No SSH connection available"
try :
stdin , stdout , stderr =
self._ssh.exec_ command( command )
remoteStdOutCon tent = stdout.readline s()
remoteStdErrCon tent = stderr.readline s()
if remoteStdErrCon tent != [] :
return False , '\n'.join(remot eStdErrContent)
return True , '\n'.join(remot eStdOutContent)
except paramiko.SSHExc eption , e :
# provide socket error reason back
return False , str(e)

[Gabriel Genellina]

Re: ssh keepalive

En Thu, 02 Oct 2008 05:26:25 -0300, loial <jldunn2000@goo glemail.com>
escribió:

<<Show us a bit of your code, so we can see why is None there.>>

Still not enough.
From your first post, the error was:

'NoneType' object has no attribute 'exec_command'

def command ( self , command ) :
""" process requested command through ssh """
print command
if not self._connected :
return False , "No SSH connection available"
try :
stdin , stdout , stderr =
self._ssh.exec_ command( command )

So you'll have to analyze how (and when) self._ssh might become None. This
function just *uses* self._ssh - look for some other places where
self._ssh is assigned to (or perhaps, deleted, if there is a class
attributes set to None).


--
Gabriel Genellina