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756 lines
28 KiB
Python
756 lines
28 KiB
Python
"""An Application for launching a kernel"""
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# Copyright (c) IPython Development Team.
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# Distributed under the terms of the Modified BSD License.
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from __future__ import annotations
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import atexit
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import errno
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import logging
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import os
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import signal
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import sys
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import traceback
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import typing as t
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from functools import partial
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from io import FileIO, TextIOWrapper
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from logging import StreamHandler
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from pathlib import Path
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import zmq
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from IPython.core.application import ( # type:ignore[attr-defined]
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BaseIPythonApplication,
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base_aliases,
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base_flags,
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catch_config_error,
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)
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from IPython.core.profiledir import ProfileDir
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from IPython.core.shellapp import InteractiveShellApp, shell_aliases, shell_flags
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from jupyter_client.connect import ConnectionFileMixin
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from jupyter_client.session import Session, session_aliases, session_flags
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from jupyter_core.paths import jupyter_runtime_dir
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from tornado import ioloop
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from traitlets.traitlets import (
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Any,
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Bool,
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Dict,
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DottedObjectName,
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Instance,
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Integer,
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Type,
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Unicode,
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default,
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)
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from traitlets.utils import filefind
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from traitlets.utils.importstring import import_item
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from zmq.eventloop.zmqstream import ZMQStream
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from .connect import get_connection_info, write_connection_file
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# local imports
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from .control import ControlThread
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from .heartbeat import Heartbeat
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from .iostream import IOPubThread
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from .ipkernel import IPythonKernel
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from .parentpoller import ParentPollerUnix, ParentPollerWindows
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from .zmqshell import ZMQInteractiveShell
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# -----------------------------------------------------------------------------
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# Flags and Aliases
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# -----------------------------------------------------------------------------
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kernel_aliases = dict(base_aliases)
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kernel_aliases.update(
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{
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"ip": "IPKernelApp.ip",
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"hb": "IPKernelApp.hb_port",
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"shell": "IPKernelApp.shell_port",
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"iopub": "IPKernelApp.iopub_port",
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"stdin": "IPKernelApp.stdin_port",
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"control": "IPKernelApp.control_port",
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"f": "IPKernelApp.connection_file",
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"transport": "IPKernelApp.transport",
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}
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)
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kernel_flags = dict(base_flags)
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kernel_flags.update(
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{
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"no-stdout": ({"IPKernelApp": {"no_stdout": True}}, "redirect stdout to the null device"),
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"no-stderr": ({"IPKernelApp": {"no_stderr": True}}, "redirect stderr to the null device"),
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"pylab": (
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{"IPKernelApp": {"pylab": "auto"}},
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"""Pre-load matplotlib and numpy for interactive use with
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the default matplotlib backend.""",
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),
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"trio-loop": (
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{"InteractiveShell": {"trio_loop": False}},
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"Enable Trio as main event loop.",
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),
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}
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)
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# inherit flags&aliases for any IPython shell apps
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kernel_aliases.update(shell_aliases)
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kernel_flags.update(shell_flags)
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# inherit flags&aliases for Sessions
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kernel_aliases.update(session_aliases)
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kernel_flags.update(session_flags)
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_ctrl_c_message = """\
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NOTE: When using the `ipython kernel` entry point, Ctrl-C will not work.
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To exit, you will have to explicitly quit this process, by either sending
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"quit" from a client, or using Ctrl-\\ in UNIX-like environments.
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To read more about this, see https://github.com/ipython/ipython/issues/2049
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"""
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# -----------------------------------------------------------------------------
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# Application class for starting an IPython Kernel
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# -----------------------------------------------------------------------------
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class IPKernelApp(BaseIPythonApplication, InteractiveShellApp, ConnectionFileMixin):
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"""The IPYKernel application class."""
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name = "ipython-kernel"
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aliases = Dict(kernel_aliases) # type:ignore[assignment]
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flags = Dict(kernel_flags) # type:ignore[assignment]
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classes = [IPythonKernel, ZMQInteractiveShell, ProfileDir, Session]
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# the kernel class, as an importstring
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kernel_class = Type(
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"ipykernel.ipkernel.IPythonKernel",
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klass="ipykernel.kernelbase.Kernel",
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help="""The Kernel subclass to be used.
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This should allow easy reuse of the IPKernelApp entry point
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to configure and launch kernels other than IPython's own.
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""",
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).tag(config=True)
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kernel = Any()
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poller = Any() # don't restrict this even though current pollers are all Threads
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heartbeat = Instance(Heartbeat, allow_none=True)
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context: zmq.Context[t.Any] | None = Any() # type:ignore[assignment]
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shell_socket = Any()
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control_socket = Any()
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debugpy_socket = Any()
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debug_shell_socket = Any()
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stdin_socket = Any()
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iopub_socket = Any()
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iopub_thread = Any()
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control_thread = Any()
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_ports = Dict()
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subcommands = {
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"install": (
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"ipykernel.kernelspec.InstallIPythonKernelSpecApp",
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"Install the IPython kernel",
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),
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}
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# connection info:
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connection_dir = Unicode()
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@default("connection_dir")
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def _default_connection_dir(self):
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return jupyter_runtime_dir()
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@property
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def abs_connection_file(self):
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if Path(self.connection_file).name == self.connection_file and self.connection_dir:
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return str(Path(str(self.connection_dir)) / self.connection_file)
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return self.connection_file
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# streams, etc.
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no_stdout = Bool(False, help="redirect stdout to the null device").tag(config=True)
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no_stderr = Bool(False, help="redirect stderr to the null device").tag(config=True)
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trio_loop = Bool(False, help="Set main event loop.").tag(config=True)
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quiet = Bool(True, help="Only send stdout/stderr to output stream").tag(config=True)
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outstream_class = DottedObjectName(
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"ipykernel.iostream.OutStream",
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help="The importstring for the OutStream factory",
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allow_none=True,
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).tag(config=True)
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displayhook_class = DottedObjectName(
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"ipykernel.displayhook.ZMQDisplayHook", help="The importstring for the DisplayHook factory"
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).tag(config=True)
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capture_fd_output = Bool(
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True,
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help="""Attempt to capture and forward low-level output, e.g. produced by Extension libraries.
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""",
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).tag(config=True)
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# polling
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parent_handle = Integer(
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int(os.environ.get("JPY_PARENT_PID") or 0),
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help="""kill this process if its parent dies. On Windows, the argument
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specifies the HANDLE of the parent process, otherwise it is simply boolean.
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""",
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).tag(config=True)
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interrupt = Integer(
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int(os.environ.get("JPY_INTERRUPT_EVENT") or 0),
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help="""ONLY USED ON WINDOWS
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Interrupt this process when the parent is signaled.
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""",
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).tag(config=True)
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def init_crash_handler(self):
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"""Initialize the crash handler."""
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sys.excepthook = self.excepthook
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def excepthook(self, etype, evalue, tb):
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"""Handle an exception."""
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# write uncaught traceback to 'real' stderr, not zmq-forwarder
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traceback.print_exception(etype, evalue, tb, file=sys.__stderr__)
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def init_poller(self):
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"""Initialize the poller."""
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if sys.platform == "win32":
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if self.interrupt or self.parent_handle:
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self.poller = ParentPollerWindows(self.interrupt, self.parent_handle)
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elif self.parent_handle and self.parent_handle != 1:
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# PID 1 (init) is special and will never go away,
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# only be reassigned.
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# Parent polling doesn't work if ppid == 1 to start with.
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self.poller = ParentPollerUnix()
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def _try_bind_socket(self, s, port):
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iface = f"{self.transport}://{self.ip}"
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if self.transport == "tcp":
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if port <= 0:
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port = s.bind_to_random_port(iface)
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else:
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s.bind("tcp://%s:%i" % (self.ip, port))
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elif self.transport == "ipc":
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if port <= 0:
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port = 1
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path = "%s-%i" % (self.ip, port)
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while Path(path).exists():
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port = port + 1
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path = "%s-%i" % (self.ip, port)
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else:
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path = "%s-%i" % (self.ip, port)
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s.bind("ipc://%s" % path)
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return port
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def _bind_socket(self, s, port):
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try:
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win_in_use = errno.WSAEADDRINUSE # type:ignore[attr-defined]
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except AttributeError:
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win_in_use = None
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# Try up to 100 times to bind a port when in conflict to avoid
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# infinite attempts in bad setups
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max_attempts = 1 if port else 100
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for attempt in range(max_attempts):
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try:
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return self._try_bind_socket(s, port)
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except zmq.ZMQError as ze:
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# Raise if we have any error not related to socket binding
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if ze.errno != errno.EADDRINUSE and ze.errno != win_in_use:
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raise
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if attempt == max_attempts - 1:
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raise
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return None
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def write_connection_file(self):
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"""write connection info to JSON file"""
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cf = self.abs_connection_file
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connection_info = dict(
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ip=self.ip,
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key=self.session.key,
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transport=self.transport,
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shell_port=self.shell_port,
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stdin_port=self.stdin_port,
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hb_port=self.hb_port,
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iopub_port=self.iopub_port,
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control_port=self.control_port,
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)
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if Path(cf).exists():
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# If the file exists, merge our info into it. For example, if the
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# original file had port number 0, we update with the actual port
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# used.
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existing_connection_info = get_connection_info(cf, unpack=True)
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assert isinstance(existing_connection_info, dict)
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connection_info = dict(existing_connection_info, **connection_info)
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if connection_info == existing_connection_info:
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self.log.debug("Connection file %s with current information already exists", cf)
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return
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self.log.debug("Writing connection file: %s", cf)
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write_connection_file(cf, **connection_info)
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def cleanup_connection_file(self):
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"""Clean up our connection file."""
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cf = self.abs_connection_file
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self.log.debug("Cleaning up connection file: %s", cf)
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try:
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Path(cf).unlink()
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except OSError:
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pass
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self.cleanup_ipc_files()
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def init_connection_file(self):
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"""Initialize our connection file."""
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if not self.connection_file:
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self.connection_file = "kernel-%s.json" % os.getpid()
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try:
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self.connection_file = filefind(self.connection_file, [".", self.connection_dir])
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except OSError:
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self.log.debug("Connection file not found: %s", self.connection_file)
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# This means I own it, and I'll create it in this directory:
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Path(self.abs_connection_file).parent.mkdir(mode=0o700, exist_ok=True, parents=True)
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# Also, I will clean it up:
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atexit.register(self.cleanup_connection_file)
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return
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try:
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self.load_connection_file()
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except Exception:
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self.log.error( # noqa: G201
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"Failed to load connection file: %r", self.connection_file, exc_info=True
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)
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self.exit(1)
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def init_sockets(self):
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"""Create a context, a session, and the kernel sockets."""
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self.log.info("Starting the kernel at pid: %i", os.getpid())
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assert self.context is None, "init_sockets cannot be called twice!"
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self.context = context = zmq.Context()
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atexit.register(self.close)
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self.shell_socket = context.socket(zmq.ROUTER)
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self.shell_socket.linger = 1000
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self.shell_port = self._bind_socket(self.shell_socket, self.shell_port)
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self.log.debug("shell ROUTER Channel on port: %i" % self.shell_port)
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self.stdin_socket = context.socket(zmq.ROUTER)
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self.stdin_socket.linger = 1000
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self.stdin_port = self._bind_socket(self.stdin_socket, self.stdin_port)
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self.log.debug("stdin ROUTER Channel on port: %i" % self.stdin_port)
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if hasattr(zmq, "ROUTER_HANDOVER"):
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# set router-handover to workaround zeromq reconnect problems
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# in certain rare circumstances
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# see ipython/ipykernel#270 and zeromq/libzmq#2892
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self.shell_socket.router_handover = self.stdin_socket.router_handover = 1
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self.init_control(context)
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self.init_iopub(context)
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def init_control(self, context):
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"""Initialize the control channel."""
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self.control_socket = context.socket(zmq.ROUTER)
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self.control_socket.linger = 1000
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self.control_port = self._bind_socket(self.control_socket, self.control_port)
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self.log.debug("control ROUTER Channel on port: %i" % self.control_port)
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self.debugpy_socket = context.socket(zmq.STREAM)
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self.debugpy_socket.linger = 1000
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self.debug_shell_socket = context.socket(zmq.DEALER)
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self.debug_shell_socket.linger = 1000
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if self.shell_socket.getsockopt(zmq.LAST_ENDPOINT):
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self.debug_shell_socket.connect(self.shell_socket.getsockopt(zmq.LAST_ENDPOINT))
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if hasattr(zmq, "ROUTER_HANDOVER"):
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# set router-handover to workaround zeromq reconnect problems
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# in certain rare circumstances
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# see ipython/ipykernel#270 and zeromq/libzmq#2892
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self.control_socket.router_handover = 1
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self.control_thread = ControlThread(daemon=True)
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def init_iopub(self, context):
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"""Initialize the iopub channel."""
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self.iopub_socket = context.socket(zmq.PUB)
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self.iopub_socket.linger = 1000
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self.iopub_port = self._bind_socket(self.iopub_socket, self.iopub_port)
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self.log.debug("iopub PUB Channel on port: %i" % self.iopub_port)
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self.configure_tornado_logger()
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self.iopub_thread = IOPubThread(self.iopub_socket, pipe=True)
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self.iopub_thread.start()
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# backward-compat: wrap iopub socket API in background thread
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self.iopub_socket = self.iopub_thread.background_socket
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def init_heartbeat(self):
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"""start the heart beating"""
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# heartbeat doesn't share context, because it mustn't be blocked
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# by the GIL, which is accessed by libzmq when freeing zero-copy messages
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hb_ctx = zmq.Context()
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self.heartbeat = Heartbeat(hb_ctx, (self.transport, self.ip, self.hb_port))
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self.hb_port = self.heartbeat.port
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self.log.debug("Heartbeat REP Channel on port: %i" % self.hb_port)
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self.heartbeat.start()
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def close(self):
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"""Close zmq sockets in an orderly fashion"""
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# un-capture IO before we start closing channels
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self.reset_io()
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self.log.info("Cleaning up sockets")
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if self.heartbeat:
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self.log.debug("Closing heartbeat channel")
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self.heartbeat.context.term()
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if self.iopub_thread:
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self.log.debug("Closing iopub channel")
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self.iopub_thread.stop()
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self.iopub_thread.close()
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if self.control_thread and self.control_thread.is_alive():
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self.log.debug("Closing control thread")
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self.control_thread.stop()
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self.control_thread.join()
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if self.debugpy_socket and not self.debugpy_socket.closed:
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self.debugpy_socket.close()
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if self.debug_shell_socket and not self.debug_shell_socket.closed:
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self.debug_shell_socket.close()
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for channel in ("shell", "control", "stdin"):
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self.log.debug("Closing %s channel", channel)
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socket = getattr(self, channel + "_socket", None)
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if socket and not socket.closed:
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socket.close()
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self.log.debug("Terminating zmq context")
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if self.context:
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self.context.term()
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self.log.debug("Terminated zmq context")
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def log_connection_info(self):
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"""display connection info, and store ports"""
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basename = Path(self.connection_file).name
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if (
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basename == self.connection_file
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or str(Path(self.connection_file).parent) == self.connection_dir
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):
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# use shortname
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tail = basename
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else:
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tail = self.connection_file
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lines = [
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"To connect another client to this kernel, use:",
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" --existing %s" % tail,
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]
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# log connection info
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# info-level, so often not shown.
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# frontends should use the %connect_info magic
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# to see the connection info
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for line in lines:
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self.log.info(line)
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# also raw print to the terminal if no parent_handle (`ipython kernel`)
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# unless log-level is CRITICAL (--quiet)
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if not self.parent_handle and int(self.log_level) < logging.CRITICAL: # type:ignore[call-overload]
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print(_ctrl_c_message, file=sys.__stdout__)
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for line in lines:
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print(line, file=sys.__stdout__)
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self._ports = dict(
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shell=self.shell_port,
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iopub=self.iopub_port,
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stdin=self.stdin_port,
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hb=self.hb_port,
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control=self.control_port,
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)
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def init_blackhole(self):
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"""redirects stdout/stderr to devnull if necessary"""
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if self.no_stdout or self.no_stderr:
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blackhole = open(os.devnull, "w") # noqa: SIM115
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if self.no_stdout:
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sys.stdout = sys.__stdout__ = blackhole # type:ignore[misc]
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if self.no_stderr:
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sys.stderr = sys.__stderr__ = blackhole # type:ignore[misc]
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def init_io(self):
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"""Redirect input streams and set a display hook."""
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if self.outstream_class:
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outstream_factory = import_item(str(self.outstream_class))
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if sys.stdout is not None:
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sys.stdout.flush()
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e_stdout = None if self.quiet else sys.__stdout__
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e_stderr = None if self.quiet else sys.__stderr__
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if not self.capture_fd_output:
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outstream_factory = partial(outstream_factory, watchfd=False)
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|
|
sys.stdout = outstream_factory(self.session, self.iopub_thread, "stdout", echo=e_stdout)
|
|
if sys.stderr is not None:
|
|
sys.stderr.flush()
|
|
sys.stderr = outstream_factory(self.session, self.iopub_thread, "stderr", echo=e_stderr)
|
|
if hasattr(sys.stderr, "_original_stdstream_copy"):
|
|
for handler in self.log.handlers:
|
|
if isinstance(handler, StreamHandler) and (handler.stream.buffer.fileno() == 2):
|
|
self.log.debug("Seeing logger to stderr, rerouting to raw filedescriptor.")
|
|
|
|
handler.stream = TextIOWrapper(
|
|
FileIO(
|
|
sys.stderr._original_stdstream_copy,
|
|
"w",
|
|
)
|
|
)
|
|
if self.displayhook_class:
|
|
displayhook_factory = import_item(str(self.displayhook_class))
|
|
self.displayhook = displayhook_factory(self.session, self.iopub_socket)
|
|
sys.displayhook = self.displayhook
|
|
|
|
self.patch_io()
|
|
|
|
def reset_io(self):
|
|
"""restore original io
|
|
|
|
restores state after init_io
|
|
"""
|
|
sys.stdout = sys.__stdout__
|
|
sys.stderr = sys.__stderr__
|
|
sys.displayhook = sys.__displayhook__
|
|
|
|
def patch_io(self):
|
|
"""Patch important libraries that can't handle sys.stdout forwarding"""
|
|
try:
|
|
import faulthandler
|
|
except ImportError:
|
|
pass
|
|
else:
|
|
# Warning: this is a monkeypatch of `faulthandler.enable`, watch for possible
|
|
# updates to the upstream API and update accordingly (up-to-date as of Python 3.5):
|
|
# https://docs.python.org/3/library/faulthandler.html#faulthandler.enable
|
|
|
|
# change default file to __stderr__ from forwarded stderr
|
|
faulthandler_enable = faulthandler.enable
|
|
|
|
def enable(file=sys.__stderr__, all_threads=True, **kwargs):
|
|
return faulthandler_enable(file=file, all_threads=all_threads, **kwargs)
|
|
|
|
faulthandler.enable = enable
|
|
|
|
if hasattr(faulthandler, "register"):
|
|
faulthandler_register = faulthandler.register
|
|
|
|
def register(signum, file=sys.__stderr__, all_threads=True, chain=False, **kwargs):
|
|
return faulthandler_register(
|
|
signum, file=file, all_threads=all_threads, chain=chain, **kwargs
|
|
)
|
|
|
|
faulthandler.register = register
|
|
|
|
def init_signal(self):
|
|
"""Initialize the signal handler."""
|
|
signal.signal(signal.SIGINT, signal.SIG_IGN)
|
|
|
|
def init_kernel(self):
|
|
"""Create the Kernel object itself"""
|
|
shell_stream = ZMQStream(self.shell_socket)
|
|
control_stream = ZMQStream(self.control_socket, self.control_thread.io_loop)
|
|
debugpy_stream = ZMQStream(self.debugpy_socket, self.control_thread.io_loop)
|
|
self.control_thread.start()
|
|
kernel_factory = self.kernel_class.instance # type:ignore[attr-defined]
|
|
|
|
kernel = kernel_factory(
|
|
parent=self,
|
|
session=self.session,
|
|
control_stream=control_stream,
|
|
debugpy_stream=debugpy_stream,
|
|
debug_shell_socket=self.debug_shell_socket,
|
|
shell_stream=shell_stream,
|
|
control_thread=self.control_thread,
|
|
iopub_thread=self.iopub_thread,
|
|
iopub_socket=self.iopub_socket,
|
|
stdin_socket=self.stdin_socket,
|
|
log=self.log,
|
|
profile_dir=self.profile_dir,
|
|
user_ns=self.user_ns,
|
|
)
|
|
kernel.record_ports({name + "_port": port for name, port in self._ports.items()})
|
|
self.kernel = kernel
|
|
|
|
# Allow the displayhook to get the execution count
|
|
self.displayhook.get_execution_count = lambda: kernel.execution_count
|
|
|
|
def init_gui_pylab(self):
|
|
"""Enable GUI event loop integration, taking pylab into account."""
|
|
|
|
# Register inline backend as default
|
|
# this is higher priority than matplotlibrc,
|
|
# but lower priority than anything else (mpl.use() for instance).
|
|
# This only affects matplotlib >= 1.5
|
|
if not os.environ.get("MPLBACKEND"):
|
|
os.environ["MPLBACKEND"] = "module://matplotlib_inline.backend_inline"
|
|
|
|
# Provide a wrapper for :meth:`InteractiveShellApp.init_gui_pylab`
|
|
# to ensure that any exception is printed straight to stderr.
|
|
# Normally _showtraceback associates the reply with an execution,
|
|
# which means frontends will never draw it, as this exception
|
|
# is not associated with any execute request.
|
|
|
|
shell = self.shell
|
|
assert shell is not None
|
|
_showtraceback = shell._showtraceback
|
|
try:
|
|
# replace error-sending traceback with stderr
|
|
def print_tb(etype, evalue, stb):
|
|
print("GUI event loop or pylab initialization failed", file=sys.stderr)
|
|
assert shell is not None
|
|
print(shell.InteractiveTB.stb2text(stb), file=sys.stderr)
|
|
|
|
shell._showtraceback = print_tb
|
|
InteractiveShellApp.init_gui_pylab(self)
|
|
finally:
|
|
shell._showtraceback = _showtraceback
|
|
|
|
def init_shell(self):
|
|
"""Initialize the shell channel."""
|
|
self.shell = getattr(self.kernel, "shell", None)
|
|
if self.shell:
|
|
self.shell.configurables.append(self)
|
|
|
|
def configure_tornado_logger(self):
|
|
"""Configure the tornado logging.Logger.
|
|
|
|
Must set up the tornado logger or else tornado will call
|
|
basicConfig for the root logger which makes the root logger
|
|
go to the real sys.stderr instead of the capture streams.
|
|
This function mimics the setup of logging.basicConfig.
|
|
"""
|
|
logger = logging.getLogger("tornado")
|
|
handler = logging.StreamHandler()
|
|
formatter = logging.Formatter(logging.BASIC_FORMAT)
|
|
handler.setFormatter(formatter)
|
|
logger.addHandler(handler)
|
|
|
|
def _init_asyncio_patch(self):
|
|
"""set default asyncio policy to be compatible with tornado
|
|
|
|
Tornado 6 (at least) is not compatible with the default
|
|
asyncio implementation on Windows
|
|
|
|
Pick the older SelectorEventLoopPolicy on Windows
|
|
if the known-incompatible default policy is in use.
|
|
|
|
Support for Proactor via a background thread is available in tornado 6.1,
|
|
but it is still preferable to run the Selector in the main thread
|
|
instead of the background.
|
|
|
|
do this as early as possible to make it a low priority and overridable
|
|
|
|
ref: https://github.com/tornadoweb/tornado/issues/2608
|
|
|
|
FIXME: if/when tornado supports the defaults in asyncio without threads,
|
|
remove and bump tornado requirement for py38.
|
|
Most likely, this will mean a new Python version
|
|
where asyncio.ProactorEventLoop supports add_reader and friends.
|
|
|
|
"""
|
|
if sys.platform.startswith("win") and sys.version_info >= (3, 8):
|
|
import asyncio
|
|
|
|
try:
|
|
from asyncio import WindowsProactorEventLoopPolicy, WindowsSelectorEventLoopPolicy
|
|
except ImportError:
|
|
pass
|
|
# not affected
|
|
else:
|
|
if type(asyncio.get_event_loop_policy()) is WindowsProactorEventLoopPolicy:
|
|
# WindowsProactorEventLoopPolicy is not compatible with tornado 6
|
|
# fallback to the pre-3.8 default of Selector
|
|
asyncio.set_event_loop_policy(WindowsSelectorEventLoopPolicy())
|
|
|
|
def init_pdb(self):
|
|
"""Replace pdb with IPython's version that is interruptible.
|
|
|
|
With the non-interruptible version, stopping pdb() locks up the kernel in a
|
|
non-recoverable state.
|
|
"""
|
|
import pdb
|
|
|
|
from IPython.core import debugger
|
|
|
|
if hasattr(debugger, "InterruptiblePdb"):
|
|
# Only available in newer IPython releases:
|
|
debugger.Pdb = debugger.InterruptiblePdb # type:ignore[misc]
|
|
pdb.Pdb = debugger.Pdb # type:ignore[assignment,misc]
|
|
pdb.set_trace = debugger.set_trace
|
|
|
|
@catch_config_error
|
|
def initialize(self, argv=None):
|
|
"""Initialize the application."""
|
|
self._init_asyncio_patch()
|
|
super().initialize(argv)
|
|
if self.subapp is not None:
|
|
return
|
|
|
|
self.init_pdb()
|
|
self.init_blackhole()
|
|
self.init_connection_file()
|
|
self.init_poller()
|
|
self.init_sockets()
|
|
self.init_heartbeat()
|
|
# writing/displaying connection info must be *after* init_sockets/heartbeat
|
|
self.write_connection_file()
|
|
# Log connection info after writing connection file, so that the connection
|
|
# file is definitely available at the time someone reads the log.
|
|
self.log_connection_info()
|
|
self.init_io()
|
|
try:
|
|
self.init_signal()
|
|
except Exception:
|
|
# Catch exception when initializing signal fails, eg when running the
|
|
# kernel on a separate thread
|
|
if int(self.log_level) < logging.CRITICAL: # type:ignore[call-overload]
|
|
self.log.error("Unable to initialize signal:", exc_info=True) # noqa: G201
|
|
self.init_kernel()
|
|
# shell init steps
|
|
self.init_path()
|
|
self.init_shell()
|
|
if self.shell:
|
|
self.init_gui_pylab()
|
|
self.init_extensions()
|
|
self.init_code()
|
|
# flush stdout/stderr, so that anything written to these streams during
|
|
# initialization do not get associated with the first execution request
|
|
sys.stdout.flush()
|
|
sys.stderr.flush()
|
|
|
|
def start(self):
|
|
"""Start the application."""
|
|
if self.subapp is not None:
|
|
return self.subapp.start()
|
|
if self.poller is not None:
|
|
self.poller.start()
|
|
self.kernel.start()
|
|
self.io_loop = ioloop.IOLoop.current()
|
|
if self.trio_loop:
|
|
from ipykernel.trio_runner import TrioRunner
|
|
|
|
tr = TrioRunner()
|
|
tr.initialize(self.kernel, self.io_loop)
|
|
try:
|
|
tr.run()
|
|
except KeyboardInterrupt:
|
|
pass
|
|
else:
|
|
try:
|
|
self.io_loop.start()
|
|
except KeyboardInterrupt:
|
|
pass
|
|
|
|
|
|
launch_new_instance = IPKernelApp.launch_instance
|
|
|
|
|
|
def main(): # pragma: no cover
|
|
"""Run an IPKernel as an application"""
|
|
app = IPKernelApp.instance()
|
|
app.initialize()
|
|
app.start()
|
|
|
|
|
|
if __name__ == "__main__":
|
|
main()
|