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"""The client and server for a basic ping-pong style heartbeat.
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"""
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#-----------------------------------------------------------------------------
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# Copyright (C) 2008-2011 The IPython Development Team
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#
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# Distributed under the terms of the BSD License. The full license is in
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# the file COPYING, distributed as part of this software.
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#-----------------------------------------------------------------------------
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#-----------------------------------------------------------------------------
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# Imports
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#-----------------------------------------------------------------------------
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import errno
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import os
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import socket
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from threading import Thread
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import zmq
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from IPython.utils.localinterfaces import LOCALHOST
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#-----------------------------------------------------------------------------
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# Code
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#-----------------------------------------------------------------------------
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class Heartbeat(Thread):
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"A simple ping-pong style heartbeat that runs in a thread."
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def __init__(self, context, addr=('tcp', LOCALHOST, 0)):
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Thread.__init__(self)
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self.context = context
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self.transport, self.ip, self.port = addr
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if self.port == 0:
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if addr[0] == 'tcp':
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s = socket.socket()
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# '*' means all interfaces to 0MQ, which is '' to socket.socket
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s.bind(('' if self.ip == '*' else self.ip, 0))
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self.port = s.getsockname()[1]
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s.close()
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elif addr[0] == 'ipc':
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self.port = 1
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while os.path.exists("%s-%s" % (self.ip, self.port)):
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self.port = self.port + 1
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else:
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raise ValueError("Unrecognized zmq transport: %s" % addr[0])
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self.addr = (self.ip, self.port)
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self.daemon = True
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def run(self):
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self.socket = self.context.socket(zmq.REP)
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c = ':' if self.transport == 'tcp' else '-'
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self.socket.bind('%s://%s' % (self.transport, self.ip) + c + str(self.port))
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while True:
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try:
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zmq.device(zmq.FORWARDER, self.socket, self.socket)
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except zmq.ZMQError as e:
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if e.errno == errno.EINTR:
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continue
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else:
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raise
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else:
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break
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