You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
124 lines
4.3 KiB
Python
124 lines
4.3 KiB
Python
"""The client and server for a basic ping-pong style heartbeat.
|
|
"""
|
|
|
|
# -----------------------------------------------------------------------------
|
|
# Copyright (C) 2008-2011 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 errno
|
|
import os
|
|
import socket
|
|
from threading import Thread
|
|
|
|
import zmq
|
|
from jupyter_client.localinterfaces import localhost
|
|
|
|
# -----------------------------------------------------------------------------
|
|
# Code
|
|
# -----------------------------------------------------------------------------
|
|
|
|
|
|
class Heartbeat(Thread):
|
|
"""A simple ping-pong style heartbeat that runs in a thread."""
|
|
|
|
def __init__(self, context, addr=None):
|
|
if addr is None:
|
|
addr = ("tcp", localhost(), 0)
|
|
Thread.__init__(self, name="Heartbeat")
|
|
self.context = context
|
|
self.transport, self.ip, self.port = addr
|
|
self.original_port = self.port
|
|
if self.original_port == 0:
|
|
self.pick_port()
|
|
self.addr = (self.ip, self.port)
|
|
self.daemon = True
|
|
self.pydev_do_not_trace = True
|
|
self.is_pydev_daemon_thread = True
|
|
self.name = "Heartbeat"
|
|
|
|
def pick_port(self):
|
|
if self.transport == "tcp":
|
|
s = socket.socket()
|
|
# '*' means all interfaces to 0MQ, which is '' to socket.socket
|
|
s.bind(("" if self.ip == "*" else self.ip, 0))
|
|
self.port = s.getsockname()[1]
|
|
s.close()
|
|
elif self.transport == "ipc":
|
|
self.port = 1
|
|
while os.path.exists(f"{self.ip}-{self.port}"):
|
|
self.port = self.port + 1
|
|
else:
|
|
raise ValueError("Unrecognized zmq transport: %s" % self.transport)
|
|
return self.port
|
|
|
|
def _try_bind_socket(self):
|
|
c = ":" if self.transport == "tcp" else "-"
|
|
return self.socket.bind(f"{self.transport}://{self.ip}" + c + str(self.port))
|
|
|
|
def _bind_socket(self):
|
|
try:
|
|
win_in_use = errno.WSAEADDRINUSE # type:ignore[attr-defined]
|
|
except AttributeError:
|
|
win_in_use = None
|
|
|
|
# Try up to 100 times to bind a port when in conflict to avoid
|
|
# infinite attempts in bad setups
|
|
max_attempts = 1 if self.original_port else 100
|
|
for attempt in range(max_attempts):
|
|
try:
|
|
self._try_bind_socket()
|
|
except zmq.ZMQError as ze:
|
|
if attempt == max_attempts - 1:
|
|
raise
|
|
# Raise if we have any error not related to socket binding
|
|
if ze.errno != errno.EADDRINUSE and ze.errno != win_in_use:
|
|
raise
|
|
# Raise if we have any error not related to socket binding
|
|
if self.original_port == 0:
|
|
self.pick_port()
|
|
else:
|
|
raise
|
|
else:
|
|
return
|
|
|
|
def run(self):
|
|
self.name = "Heartbeat"
|
|
self.socket = self.context.socket(zmq.ROUTER)
|
|
self.socket.linger = 1000
|
|
try:
|
|
self._bind_socket()
|
|
except Exception:
|
|
self.socket.close()
|
|
raise
|
|
|
|
while True:
|
|
try:
|
|
zmq.device(zmq.QUEUE, self.socket, self.socket)
|
|
except zmq.ZMQError as e:
|
|
if e.errno == errno.EINTR:
|
|
# signal interrupt, resume heartbeat
|
|
continue
|
|
elif e.errno == zmq.ETERM:
|
|
# context terminated, close socket and exit
|
|
try:
|
|
self.socket.close()
|
|
except zmq.ZMQError:
|
|
# suppress further errors during cleanup
|
|
# this shouldn't happen, though
|
|
pass
|
|
break
|
|
elif e.errno == zmq.ENOTSOCK:
|
|
# socket closed elsewhere, exit
|
|
break
|
|
else:
|
|
raise
|
|
else:
|
|
break
|