def remote_exec(self, source, stdout=None, stderr=None):
""" return channel object and connect it to a remote
execution thread where the given 'source' executes
and has the sister 'channel' object in its global
namespace. The callback functions 'stdout' and
'stderr' get called on receival of remote
stdout/stderr output strings.
"""
try:
source = str(Source(source))
except NameError:
try:
import py
source = str(py.code.Source(source))
except ImportError:
pass
channel = self.newchannel()
outid = self._newredirectchannelid(stdout)
errid = self._newredirectchannelid(stderr)
self._send(Message.CHANNEL_OPEN(
channel.id, (source, outid, errid)))
return channel
