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ORPA-pyOpenRPA/Resources/LPy64-3105/lib/python3.10/site-packages/jupyter_client/kernelapp.py

89 lines
2.6 KiB

import os
import signal
import uuid
from jupyter_core.application import base_flags
from jupyter_core.application import JupyterApp
from tornado.ioloop import IOLoop
from traitlets import Unicode
from . import __version__
from .kernelspec import KernelSpecManager
from .kernelspec import NATIVE_KERNEL_NAME
from .manager import KernelManager
class KernelApp(JupyterApp):
"""Launch a kernel by name in a local subprocess."""
version = __version__
description = "Run a kernel locally in a subprocess"
classes = [KernelManager, KernelSpecManager]
aliases = {
"kernel": "KernelApp.kernel_name",
"ip": "KernelManager.ip",
}
flags = {"debug": base_flags["debug"]}
kernel_name = Unicode(NATIVE_KERNEL_NAME, help="The name of a kernel type to start").tag(
config=True
)
def initialize(self, argv=None):
super().initialize(argv)
cf_basename = "kernel-%s.json" % uuid.uuid4()
self.config.setdefault("KernelManager", {}).setdefault(
"connection_file", os.path.join(self.runtime_dir, cf_basename)
)
self.km = KernelManager(kernel_name=self.kernel_name, config=self.config)
self.loop = IOLoop.current()
self.loop.add_callback(self._record_started)
def setup_signals(self) -> None:
"""Shutdown on SIGTERM or SIGINT (Ctrl-C)"""
if os.name == "nt":
return
def shutdown_handler(signo, frame):
self.loop.add_callback_from_signal(self.shutdown, signo)
for sig in [signal.SIGTERM, signal.SIGINT]:
signal.signal(sig, shutdown_handler)
def shutdown(self, signo: int) -> None:
self.log.info("Shutting down on signal %d" % signo)
self.km.shutdown_kernel()
self.loop.stop()
def log_connection_info(self) -> None:
cf = self.km.connection_file
self.log.info("Connection file: %s", cf)
self.log.info("To connect a client: --existing %s", os.path.basename(cf))
def _record_started(self) -> None:
"""For tests, create a file to indicate that we've started
Do not rely on this except in our own tests!
"""
fn = os.environ.get("JUPYTER_CLIENT_TEST_RECORD_STARTUP_PRIVATE")
if fn is not None:
with open(fn, "wb"):
pass
def start(self) -> None:
self.log.info("Starting kernel %r", self.kernel_name)
try:
self.km.start_kernel()
self.log_connection_info()
self.setup_signals()
self.loop.start()
finally:
self.km.cleanup_resources()
main = KernelApp.launch_instance