#!/usr/bin/env python

"""

Example of running the Python REPL through an SSH connection in an asyncio process.

This requires Python 3, asyncio and asyncssh.

Run this example and then SSH to localhost, port 8222.

"""

import asyncio

import asyncssh

import logging

from ptpython.contrib.asyncssh_repl import ReplSSHServerSession

logging.basicConfig()

logging.getLogger().setLevel(logging.INFO)

class MySSHServer(asyncssh.SSHServer):

"""

Server without authentication, running `ReplSSHServerSession`.

"""

def __init__(self, get_namespace):

self.get_namespace = get_namespace

def begin_auth(self, username):

# No authentication.

return False

def session_requested(self):

return ReplSSHServerSession(self.get_namespace)

def main(port=8222):

"""

Example that starts the REPL through an SSH server.

"""

loop = asyncio.get_event_loop()

# Namespace exposed in the REPL.

environ = {'hello': 'world'}

# Start SSH server.

def create_server():

return MySSHServer(lambda: environ)

print('Listening on :%i' % port)

print('To connect, do "ssh localhost -p %i"' % port)

loop.run_until_complete(

asyncssh.create_server(create_server, '', port,

server_host_keys=['/etc/ssh/ssh_host_dsa_key']))

# Run eventloop.

loop.run_forever()

if __name__ == '__main__':

main()