|
|
#!/usr/bin/env python
|
|
|
"""Utility for forwarding file read events over a zmq socket.
|
|
|
|
|
|
This is necessary because select on Windows only supports"""
|
|
|
|
|
|
#-----------------------------------------------------------------------------
|
|
|
# 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']
|
