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"""Utility for forwarding file read events over a zmq socket.
This is necessary because select on Windows only supports sockets, not FDs.
Authors:
* MinRK
"""
#-----------------------------------------------------------------------------
# Copyright (C) 2011 The IPython Development Team
#
# Distributed under the terms of the BSD License. The full license is in
# the file COPYING, distributed as part of this software.
#-----------------------------------------------------------------------------
#-----------------------------------------------------------------------------
# Imports
#-----------------------------------------------------------------------------
import uuid
import zmq
from threading import Thread
#-----------------------------------------------------------------------------
# Code
#-----------------------------------------------------------------------------
class ForwarderThread(Thread):
def __init__(self, sock, fd):
Thread.__init__(self)
self.daemon=True
self.sock = sock
self.fd = fd
def run(self):
"""Loop through lines in self.fd, and send them over self.sock."""
line = self.fd.readline()
# allow for files opened in unicode mode
if isinstance(line, unicode):
send = self.sock.send_unicode
else:
send = self.sock.send
while line:
send(line)
line = self.fd.readline()
# line == '' means EOF
self.fd.close()
self.sock.close()
def forward_read_events(fd, context=None):
"""Forward read events from an FD over a socket.
This method wraps a file in a socket pair, so it can
be polled for read events by select (specifically zmq.eventloop.ioloop)
"""
if context is None:
context = zmq.Context.instance()
push = context.socket(zmq.PUSH)
push.setsockopt(zmq.LINGER, -1)
pull = context.socket(zmq.PULL)
addr='inproc://%s'%uuid.uuid4()
push.bind(addr)
pull.connect(addr)
forwarder = ForwarderThread(push, fd)
forwarder.start()
return pull
__all__ = ['forward_read_events']
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