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ORPA-pyOpenRPA/Resources/LPy64-3105/lib/python3.10/site-packages/ipykernel/heartbeat.py

124 lines
4.3 KiB

"""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("%s-%s" % (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("%s://%s" % (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