> On Apr 6, 2019, at 10:12 AM, Sereysethy TOUCH <touch.sereyse...@gmail.com>
> wrote:
>
> Hi Jean-Paul,
>
> No I dont want it to be mixed with stdout stream, it should be separated from
> normal stdout, so that I know it is an error.
>
> To be honest, I am pretty to new to Twisted concept, there are things that I
> have not familiar with yet. Actually I can also implement a low level ssh
> client (which I already did), but as SSHCommandClientEndpoint is already
> available, so I want to use it straight away. But when I dived in the source
> code, the _CommandChannel only implements dataReceived but not extReceived.
The main point of `SSHCommandClientEndpoint` is to allow code that doesn't know
about SSH to run over SSH, for example to enable forwarding. So you can't
unconditionally require everyone to implement extReceived, because IProtocol
doesn't require this.
> For your suggestion on using ProcessEndpoint how can I use it for my SSH
> client?
Jean-Paul was suggesting a way that Twisted could be modified to support your
use-case, not a thing that you can do today in your own code.
> In my extReceived I just deliver what I got to the extReceived of method
> protocol, it is exactly the same as Twisted implements dataReceived:
>
> class CommandChannel(_CommandChannel):
> def extReceived(self, dataType, data):
> """
> When the command's extended data (usually standard error) arrives,
> deliver it to the protocol instance.
>
> @type dataType: L{int}
> @type data: L{str}
> """
> self._protocol.extReceived(dataType, data)
If you wanted to contribute this functionality to Twisted, the usual idiom here
would be to do a check, like:
protocol = self._protocol
if ISSHExtendedProtocol.providedBy(protocol):
protocol.extReceived(dataType, data)
Doing this on every extReceived may be a little bit of a performance hit, so
caching this computation and/or the behavior associated with it is left as an
exercise for you :).
> I have two other questions since you are here
>
> 1) how can we execute command like more or less which is an interactive
> command?
Looking at what the 'conch' script does, I think what you're asking is
something like this:
self.conn.sendRequest(self, b'exec', common.NS(options['command']))
> 2) how to request a pty to ssh server?
Again from twisted/conch/scripts/conch.py:
ptyReqData = session.packRequest_pty_req(term, winSize, '')
self.conn.sendRequest(self, b'pty-req', ptyReqData)
>
> Thanks,
> Sethy
Thanks for using Twisted,
-g
_______________________________________________
Twisted-Python mailing list
Twisted-Python@twistedmatrix.com
https://twistedmatrix.com/cgi-bin/mailman/listinfo/twisted-python
