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806 lines
29 KiB
806 lines
29 KiB
"""Base class to manage the interaction with a running kernel"""
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# Copyright (c) Jupyter Development Team.
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# Distributed under the terms of the Modified BSD License.
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import asyncio
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import sys
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import time
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import typing as t
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from functools import partial
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from getpass import getpass
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from queue import Empty
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import zmq.asyncio
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from traitlets import Any
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from traitlets import Bool
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from traitlets import Instance
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from traitlets import Type
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from .channelsabc import ChannelABC
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from .channelsabc import HBChannelABC
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from .clientabc import KernelClientABC
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from .connect import ConnectionFileMixin
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from .session import Session
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from .utils import ensure_async
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from jupyter_client.channels import major_protocol_version
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# some utilities to validate message structure, these might get moved elsewhere
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# if they prove to have more generic utility
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def validate_string_dict(dct: t.Dict[str, str]) -> None:
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"""Validate that the input is a dict with string keys and values.
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Raises ValueError if not."""
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for k, v in dct.items():
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if not isinstance(k, str):
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raise ValueError("key %r in dict must be a string" % k)
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if not isinstance(v, str):
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raise ValueError("value %r in dict must be a string" % v)
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def reqrep(wrapped: t.Callable, meth: t.Callable, channel: str = "shell") -> t.Callable:
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wrapped = wrapped(meth, channel)
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if not meth.__doc__:
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# python -OO removes docstrings,
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# so don't bother building the wrapped docstring
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return wrapped
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basedoc, _ = meth.__doc__.split("Returns\n", 1)
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parts = [basedoc.strip()]
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if "Parameters" not in basedoc:
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parts.append(
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"""
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Parameters
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----------
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"""
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)
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parts.append(
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"""
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reply: bool (default: False)
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Whether to wait for and return reply
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timeout: float or None (default: None)
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Timeout to use when waiting for a reply
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Returns
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-------
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msg_id: str
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The msg_id of the request sent, if reply=False (default)
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reply: dict
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The reply message for this request, if reply=True
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"""
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)
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wrapped.__doc__ = "\n".join(parts)
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return wrapped
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class KernelClient(ConnectionFileMixin):
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"""Communicates with a single kernel on any host via zmq channels.
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There are five channels associated with each kernel:
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* shell: for request/reply calls to the kernel.
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* iopub: for the kernel to publish results to frontends.
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* hb: for monitoring the kernel's heartbeat.
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* stdin: for frontends to reply to raw_input calls in the kernel.
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* control: for kernel management calls to the kernel.
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The messages that can be sent on these channels are exposed as methods of the
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client (KernelClient.execute, complete, history, etc.). These methods only
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send the message, they don't wait for a reply. To get results, use e.g.
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:meth:`get_shell_msg` to fetch messages from the shell channel.
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"""
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# The PyZMQ Context to use for communication with the kernel.
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context = Instance(zmq.asyncio.Context)
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_created_context = Bool(False)
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def _context_default(self) -> zmq.asyncio.Context:
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self._created_context = True
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return zmq.asyncio.Context()
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# The classes to use for the various channels
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shell_channel_class = Type(ChannelABC)
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iopub_channel_class = Type(ChannelABC)
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stdin_channel_class = Type(ChannelABC)
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hb_channel_class = Type(HBChannelABC)
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control_channel_class = Type(ChannelABC)
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# Protected traits
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_shell_channel = Any()
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_iopub_channel = Any()
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_stdin_channel = Any()
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_hb_channel = Any()
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_control_channel = Any()
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# flag for whether execute requests should be allowed to call raw_input:
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allow_stdin: bool = True
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def __del__(self):
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"""Handle garbage collection. Destroy context if applicable."""
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if self._created_context and self.context and not self.context.closed:
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if self.channels_running:
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if self.log:
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self.log.warning("Could not destroy zmq context for %s", self)
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else:
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if self.log:
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self.log.debug("Destroying zmq context for %s", self)
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self.context.destroy()
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try:
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super_del = super().__del__
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except AttributeError:
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pass
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else:
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super_del()
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# --------------------------------------------------------------------------
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# Channel proxy methods
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# --------------------------------------------------------------------------
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async def _async_get_shell_msg(self, *args: t.Any, **kwargs: t.Any) -> t.Dict[str, t.Any]:
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"""Get a message from the shell channel"""
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return await self.shell_channel.get_msg(*args, **kwargs)
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async def _async_get_iopub_msg(self, *args: t.Any, **kwargs: t.Any) -> t.Dict[str, t.Any]:
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"""Get a message from the iopub channel"""
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return await self.iopub_channel.get_msg(*args, **kwargs)
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async def _async_get_stdin_msg(self, *args: t.Any, **kwargs: t.Any) -> t.Dict[str, t.Any]:
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"""Get a message from the stdin channel"""
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return await self.stdin_channel.get_msg(*args, **kwargs)
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async def _async_get_control_msg(self, *args: t.Any, **kwargs: t.Any) -> t.Dict[str, t.Any]:
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"""Get a message from the control channel"""
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return await self.control_channel.get_msg(*args, **kwargs)
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async def _async_wait_for_ready(self, timeout: t.Optional[float] = None) -> None:
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"""Waits for a response when a client is blocked
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- Sets future time for timeout
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- Blocks on shell channel until a message is received
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- Exit if the kernel has died
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- If client times out before receiving a message from the kernel, send RuntimeError
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- Flush the IOPub channel
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"""
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if timeout is None:
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timeout = float("inf")
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abs_timeout = time.time() + timeout
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from .manager import KernelManager
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if not isinstance(self.parent, KernelManager):
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# This Client was not created by a KernelManager,
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# so wait for kernel to become responsive to heartbeats
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# before checking for kernel_info reply
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while not await ensure_async(self.is_alive()):
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if time.time() > abs_timeout:
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raise RuntimeError(
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"Kernel didn't respond to heartbeats in %d seconds and timed out" % timeout
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)
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await asyncio.sleep(0.2)
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# Wait for kernel info reply on shell channel
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while True:
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self.kernel_info()
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try:
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msg = await self.shell_channel.get_msg(timeout=1)
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except Empty:
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pass
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else:
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if msg["msg_type"] == "kernel_info_reply":
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# Checking that IOPub is connected. If it is not connected, start over.
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try:
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await self.iopub_channel.get_msg(timeout=0.2)
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except Empty:
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pass
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else:
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self._handle_kernel_info_reply(msg)
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break
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if not await ensure_async(self.is_alive()):
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raise RuntimeError("Kernel died before replying to kernel_info")
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# Check if current time is ready check time plus timeout
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if time.time() > abs_timeout:
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raise RuntimeError("Kernel didn't respond in %d seconds" % timeout)
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# Flush IOPub channel
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while True:
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try:
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msg = await self.iopub_channel.get_msg(timeout=0.2)
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except Empty:
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break
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async def _async_recv_reply(
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self, msg_id: str, timeout: t.Optional[float] = None, channel: str = "shell"
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) -> t.Dict[str, t.Any]:
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"""Receive and return the reply for a given request"""
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if timeout is not None:
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deadline = time.monotonic() + timeout
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while True:
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if timeout is not None:
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timeout = max(0, deadline - time.monotonic())
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try:
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if channel == "control":
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reply = await self._async_get_control_msg(timeout=timeout)
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else:
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reply = await self._async_get_shell_msg(timeout=timeout)
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except Empty as e:
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raise TimeoutError("Timeout waiting for reply") from e
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if reply["parent_header"].get("msg_id") != msg_id:
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# not my reply, someone may have forgotten to retrieve theirs
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continue
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return reply
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def _stdin_hook_default(self, msg: t.Dict[str, t.Any]) -> None:
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"""Handle an input request"""
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content = msg["content"]
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if content.get("password", False):
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prompt = getpass
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else:
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prompt = input # type: ignore
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try:
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raw_data = prompt(content["prompt"])
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except EOFError:
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# turn EOFError into EOF character
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raw_data = "\x04"
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except KeyboardInterrupt:
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sys.stdout.write("\n")
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return
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# only send stdin reply if there *was not* another request
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# or execution finished while we were reading.
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if not (self.stdin_channel.msg_ready() or self.shell_channel.msg_ready()):
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self.input(raw_data)
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def _output_hook_default(self, msg: t.Dict[str, t.Any]) -> None:
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"""Default hook for redisplaying plain-text output"""
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msg_type = msg["header"]["msg_type"]
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content = msg["content"]
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if msg_type == "stream":
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stream = getattr(sys, content["name"])
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stream.write(content["text"])
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elif msg_type in ("display_data", "execute_result"):
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sys.stdout.write(content["data"].get("text/plain", ""))
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elif msg_type == "error":
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print("\n".join(content["traceback"]), file=sys.stderr)
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def _output_hook_kernel(
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self,
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session: Session,
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socket: zmq.sugar.socket.Socket,
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parent_header: t.Any,
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msg: t.Dict[str, t.Any],
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) -> None:
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"""Output hook when running inside an IPython kernel
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adds rich output support.
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"""
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msg_type = msg["header"]["msg_type"]
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if msg_type in ("display_data", "execute_result", "error"):
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session.send(socket, msg_type, msg["content"], parent=parent_header)
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else:
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self._output_hook_default(msg)
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# --------------------------------------------------------------------------
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# Channel management methods
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# --------------------------------------------------------------------------
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def start_channels(
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self,
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shell: bool = True,
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iopub: bool = True,
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stdin: bool = True,
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hb: bool = True,
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control: bool = True,
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) -> None:
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"""Starts the channels for this kernel.
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This will create the channels if they do not exist and then start
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them (their activity runs in a thread). If port numbers of 0 are
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being used (random ports) then you must first call
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:meth:`start_kernel`. If the channels have been stopped and you
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call this, :class:`RuntimeError` will be raised.
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"""
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if iopub:
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self.iopub_channel.start()
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if shell:
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self.shell_channel.start()
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if stdin:
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self.stdin_channel.start()
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self.allow_stdin = True
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else:
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self.allow_stdin = False
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if hb:
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self.hb_channel.start()
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if control:
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self.control_channel.start()
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def stop_channels(self) -> None:
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"""Stops all the running channels for this kernel.
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This stops their event loops and joins their threads.
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"""
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if self.shell_channel.is_alive():
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self.shell_channel.stop()
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if self.iopub_channel.is_alive():
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self.iopub_channel.stop()
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if self.stdin_channel.is_alive():
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self.stdin_channel.stop()
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if self.hb_channel.is_alive():
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self.hb_channel.stop()
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if self.control_channel.is_alive():
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self.control_channel.stop()
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@property
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def channels_running(self) -> bool:
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"""Are any of the channels created and running?"""
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return (
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(self._shell_channel and self.shell_channel.is_alive())
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or (self._iopub_channel and self.iopub_channel.is_alive())
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or (self._stdin_channel and self.stdin_channel.is_alive())
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or (self._hb_channel and self.hb_channel.is_alive())
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or (self._control_channel and self.control_channel.is_alive())
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)
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ioloop = None # Overridden in subclasses that use pyzmq event loop
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@property
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def shell_channel(self) -> t.Any:
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"""Get the shell channel object for this kernel."""
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if self._shell_channel is None:
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url = self._make_url("shell")
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self.log.debug("connecting shell channel to %s", url)
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socket = self.connect_shell(identity=self.session.bsession)
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self._shell_channel = self.shell_channel_class(socket, self.session, self.ioloop)
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return self._shell_channel
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@property
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def iopub_channel(self) -> t.Any:
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"""Get the iopub channel object for this kernel."""
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if self._iopub_channel is None:
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url = self._make_url("iopub")
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self.log.debug("connecting iopub channel to %s", url)
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socket = self.connect_iopub()
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self._iopub_channel = self.iopub_channel_class(socket, self.session, self.ioloop)
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return self._iopub_channel
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@property
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def stdin_channel(self) -> t.Any:
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"""Get the stdin channel object for this kernel."""
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if self._stdin_channel is None:
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url = self._make_url("stdin")
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self.log.debug("connecting stdin channel to %s", url)
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socket = self.connect_stdin(identity=self.session.bsession)
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self._stdin_channel = self.stdin_channel_class(socket, self.session, self.ioloop)
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return self._stdin_channel
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@property
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def hb_channel(self) -> t.Any:
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"""Get the hb channel object for this kernel."""
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if self._hb_channel is None:
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url = self._make_url("hb")
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self.log.debug("connecting heartbeat channel to %s", url)
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self._hb_channel = self.hb_channel_class(self.context, self.session, url)
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return self._hb_channel
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@property
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def control_channel(self) -> t.Any:
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"""Get the control channel object for this kernel."""
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if self._control_channel is None:
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url = self._make_url("control")
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self.log.debug("connecting control channel to %s", url)
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socket = self.connect_control(identity=self.session.bsession)
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self._control_channel = self.control_channel_class(socket, self.session, self.ioloop)
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return self._control_channel
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async def _async_is_alive(self) -> bool:
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"""Is the kernel process still running?"""
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from .manager import KernelManager
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if isinstance(self.parent, KernelManager):
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# This KernelClient was created by a KernelManager,
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# we can ask the parent KernelManager:
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return await ensure_async(self.parent.is_alive())
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if self._hb_channel is not None:
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# We don't have access to the KernelManager,
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# so we use the heartbeat.
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return self._hb_channel.is_beating()
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# no heartbeat and not local, we can't tell if it's running,
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# so naively return True
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return True
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async def _async_execute_interactive(
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self,
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code: str,
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silent: bool = False,
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store_history: bool = True,
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user_expressions: t.Optional[t.Dict[str, t.Any]] = None,
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allow_stdin: t.Optional[bool] = None,
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stop_on_error: bool = True,
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timeout: t.Optional[float] = None,
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output_hook: t.Optional[t.Callable] = None,
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stdin_hook: t.Optional[t.Callable] = None,
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) -> t.Dict[str, t.Any]:
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"""Execute code in the kernel interactively
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Output will be redisplayed, and stdin prompts will be relayed as well.
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If an IPython kernel is detected, rich output will be displayed.
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You can pass a custom output_hook callable that will be called
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with every IOPub message that is produced instead of the default redisplay.
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.. versionadded:: 5.0
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Parameters
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----------
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code : str
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A string of code in the kernel's language.
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silent : bool, optional (default False)
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If set, the kernel will execute the code as quietly possible, and
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will force store_history to be False.
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store_history : bool, optional (default True)
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If set, the kernel will store command history. This is forced
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to be False if silent is True.
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user_expressions : dict, optional
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A dict mapping names to expressions to be evaluated in the user's
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dict. The expression values are returned as strings formatted using
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:func:`repr`.
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allow_stdin : bool, optional (default self.allow_stdin)
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Flag for whether the kernel can send stdin requests to frontends.
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Some frontends (e.g. the Notebook) do not support stdin requests.
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If raw_input is called from code executed from such a frontend, a
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StdinNotImplementedError will be raised.
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stop_on_error: bool, optional (default True)
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Flag whether to abort the execution queue, if an exception is encountered.
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timeout: float or None (default: None)
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Timeout to use when waiting for a reply
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output_hook: callable(msg)
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Function to be called with output messages.
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If not specified, output will be redisplayed.
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stdin_hook: callable(msg)
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Function to be called with stdin_request messages.
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If not specified, input/getpass will be called.
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Returns
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-------
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reply: dict
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The reply message for this request
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"""
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if not self.iopub_channel.is_alive():
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raise RuntimeError("IOPub channel must be running to receive output")
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if allow_stdin is None:
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allow_stdin = self.allow_stdin
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if allow_stdin and not self.stdin_channel.is_alive():
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raise RuntimeError("stdin channel must be running to allow input")
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msg_id = self.execute(
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code,
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silent=silent,
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store_history=store_history,
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user_expressions=user_expressions,
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allow_stdin=allow_stdin,
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stop_on_error=stop_on_error,
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)
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if stdin_hook is None:
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stdin_hook = self._stdin_hook_default
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if output_hook is None:
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# detect IPython kernel
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if "IPython" in sys.modules:
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from IPython import get_ipython # type: ignore
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ip = get_ipython()
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in_kernel = getattr(ip, "kernel", False)
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if in_kernel:
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output_hook = partial(
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self._output_hook_kernel,
|
|
ip.display_pub.session,
|
|
ip.display_pub.pub_socket,
|
|
ip.display_pub.parent_header,
|
|
)
|
|
if output_hook is None:
|
|
# default: redisplay plain-text outputs
|
|
output_hook = self._output_hook_default
|
|
|
|
# set deadline based on timeout
|
|
if timeout is not None:
|
|
deadline = time.monotonic() + timeout
|
|
else:
|
|
timeout_ms = None
|
|
|
|
poller = zmq.Poller()
|
|
iopub_socket = self.iopub_channel.socket
|
|
poller.register(iopub_socket, zmq.POLLIN)
|
|
if allow_stdin:
|
|
stdin_socket = self.stdin_channel.socket
|
|
poller.register(stdin_socket, zmq.POLLIN)
|
|
else:
|
|
stdin_socket = None
|
|
|
|
# wait for output and redisplay it
|
|
while True:
|
|
if timeout is not None:
|
|
timeout = max(0, deadline - time.monotonic())
|
|
timeout_ms = int(1000 * timeout)
|
|
events = dict(poller.poll(timeout_ms))
|
|
if not events:
|
|
raise TimeoutError("Timeout waiting for output")
|
|
if stdin_socket in events:
|
|
req = await self.stdin_channel.get_msg(timeout=0)
|
|
stdin_hook(req)
|
|
continue
|
|
if iopub_socket not in events:
|
|
continue
|
|
|
|
msg = await self.iopub_channel.get_msg(timeout=0)
|
|
|
|
if msg["parent_header"].get("msg_id") != msg_id:
|
|
# not from my request
|
|
continue
|
|
output_hook(msg)
|
|
|
|
# stop on idle
|
|
if (
|
|
msg["header"]["msg_type"] == "status"
|
|
and msg["content"]["execution_state"] == "idle"
|
|
):
|
|
break
|
|
|
|
# output is done, get the reply
|
|
if timeout is not None:
|
|
timeout = max(0, deadline - time.monotonic())
|
|
return await self._async_recv_reply(msg_id, timeout=timeout)
|
|
|
|
# Methods to send specific messages on channels
|
|
def execute(
|
|
self,
|
|
code: str,
|
|
silent: bool = False,
|
|
store_history: bool = True,
|
|
user_expressions: t.Optional[t.Dict[str, t.Any]] = None,
|
|
allow_stdin: t.Optional[bool] = None,
|
|
stop_on_error: bool = True,
|
|
) -> str:
|
|
"""Execute code in the kernel.
|
|
|
|
Parameters
|
|
----------
|
|
code : str
|
|
A string of code in the kernel's language.
|
|
|
|
silent : bool, optional (default False)
|
|
If set, the kernel will execute the code as quietly possible, and
|
|
will force store_history to be False.
|
|
|
|
store_history : bool, optional (default True)
|
|
If set, the kernel will store command history. This is forced
|
|
to be False if silent is True.
|
|
|
|
user_expressions : dict, optional
|
|
A dict mapping names to expressions to be evaluated in the user's
|
|
dict. The expression values are returned as strings formatted using
|
|
:func:`repr`.
|
|
|
|
allow_stdin : bool, optional (default self.allow_stdin)
|
|
Flag for whether the kernel can send stdin requests to frontends.
|
|
|
|
Some frontends (e.g. the Notebook) do not support stdin requests.
|
|
If raw_input is called from code executed from such a frontend, a
|
|
StdinNotImplementedError will be raised.
|
|
|
|
stop_on_error: bool, optional (default True)
|
|
Flag whether to abort the execution queue, if an exception is encountered.
|
|
|
|
Returns
|
|
-------
|
|
The msg_id of the message sent.
|
|
"""
|
|
if user_expressions is None:
|
|
user_expressions = {}
|
|
if allow_stdin is None:
|
|
allow_stdin = self.allow_stdin
|
|
|
|
# Don't waste network traffic if inputs are invalid
|
|
if not isinstance(code, str):
|
|
raise ValueError("code %r must be a string" % code)
|
|
validate_string_dict(user_expressions)
|
|
|
|
# Create class for content/msg creation. Related to, but possibly
|
|
# not in Session.
|
|
content = dict(
|
|
code=code,
|
|
silent=silent,
|
|
store_history=store_history,
|
|
user_expressions=user_expressions,
|
|
allow_stdin=allow_stdin,
|
|
stop_on_error=stop_on_error,
|
|
)
|
|
msg = self.session.msg("execute_request", content)
|
|
self.shell_channel.send(msg)
|
|
return msg["header"]["msg_id"]
|
|
|
|
def complete(self, code: str, cursor_pos: t.Optional[int] = None) -> str:
|
|
"""Tab complete text in the kernel's namespace.
|
|
|
|
Parameters
|
|
----------
|
|
code : str
|
|
The context in which completion is requested.
|
|
Can be anything between a variable name and an entire cell.
|
|
cursor_pos : int, optional
|
|
The position of the cursor in the block of code where the completion was requested.
|
|
Default: ``len(code)``
|
|
|
|
Returns
|
|
-------
|
|
The msg_id of the message sent.
|
|
"""
|
|
if cursor_pos is None:
|
|
cursor_pos = len(code)
|
|
content = dict(code=code, cursor_pos=cursor_pos)
|
|
msg = self.session.msg("complete_request", content)
|
|
self.shell_channel.send(msg)
|
|
return msg["header"]["msg_id"]
|
|
|
|
def inspect(self, code: str, cursor_pos: t.Optional[int] = None, detail_level: int = 0) -> str:
|
|
"""Get metadata information about an object in the kernel's namespace.
|
|
|
|
It is up to the kernel to determine the appropriate object to inspect.
|
|
|
|
Parameters
|
|
----------
|
|
code : str
|
|
The context in which info is requested.
|
|
Can be anything between a variable name and an entire cell.
|
|
cursor_pos : int, optional
|
|
The position of the cursor in the block of code where the info was requested.
|
|
Default: ``len(code)``
|
|
detail_level : int, optional
|
|
The level of detail for the introspection (0-2)
|
|
|
|
Returns
|
|
-------
|
|
The msg_id of the message sent.
|
|
"""
|
|
if cursor_pos is None:
|
|
cursor_pos = len(code)
|
|
content = dict(
|
|
code=code,
|
|
cursor_pos=cursor_pos,
|
|
detail_level=detail_level,
|
|
)
|
|
msg = self.session.msg("inspect_request", content)
|
|
self.shell_channel.send(msg)
|
|
return msg["header"]["msg_id"]
|
|
|
|
def history(
|
|
self,
|
|
raw: bool = True,
|
|
output: bool = False,
|
|
hist_access_type: str = "range",
|
|
**kwargs: t.Any,
|
|
) -> str:
|
|
"""Get entries from the kernel's history list.
|
|
|
|
Parameters
|
|
----------
|
|
raw : bool
|
|
If True, return the raw input.
|
|
output : bool
|
|
If True, then return the output as well.
|
|
hist_access_type : str
|
|
'range' (fill in session, start and stop params), 'tail' (fill in n)
|
|
or 'search' (fill in pattern param).
|
|
|
|
session : int
|
|
For a range request, the session from which to get lines. Session
|
|
numbers are positive integers; negative ones count back from the
|
|
current session.
|
|
start : int
|
|
The first line number of a history range.
|
|
stop : int
|
|
The final (excluded) line number of a history range.
|
|
|
|
n : int
|
|
The number of lines of history to get for a tail request.
|
|
|
|
pattern : str
|
|
The glob-syntax pattern for a search request.
|
|
|
|
Returns
|
|
-------
|
|
The ID of the message sent.
|
|
"""
|
|
if hist_access_type == "range":
|
|
kwargs.setdefault("session", 0)
|
|
kwargs.setdefault("start", 0)
|
|
content = dict(raw=raw, output=output, hist_access_type=hist_access_type, **kwargs)
|
|
msg = self.session.msg("history_request", content)
|
|
self.shell_channel.send(msg)
|
|
return msg["header"]["msg_id"]
|
|
|
|
def kernel_info(self) -> str:
|
|
"""Request kernel info
|
|
|
|
Returns
|
|
-------
|
|
The msg_id of the message sent
|
|
"""
|
|
msg = self.session.msg("kernel_info_request")
|
|
self.shell_channel.send(msg)
|
|
return msg["header"]["msg_id"]
|
|
|
|
def comm_info(self, target_name: t.Optional[str] = None) -> str:
|
|
"""Request comm info
|
|
|
|
Returns
|
|
-------
|
|
The msg_id of the message sent
|
|
"""
|
|
if target_name is None:
|
|
content = {}
|
|
else:
|
|
content = dict(target_name=target_name)
|
|
msg = self.session.msg("comm_info_request", content)
|
|
self.shell_channel.send(msg)
|
|
return msg["header"]["msg_id"]
|
|
|
|
def _handle_kernel_info_reply(self, msg: t.Dict[str, t.Any]) -> None:
|
|
"""handle kernel info reply
|
|
|
|
sets protocol adaptation version. This might
|
|
be run from a separate thread.
|
|
"""
|
|
adapt_version = int(msg["content"]["protocol_version"].split(".")[0])
|
|
if adapt_version != major_protocol_version:
|
|
self.session.adapt_version = adapt_version
|
|
|
|
def is_complete(self, code: str) -> str:
|
|
"""Ask the kernel whether some code is complete and ready to execute."""
|
|
msg = self.session.msg("is_complete_request", {"code": code})
|
|
self.shell_channel.send(msg)
|
|
return msg["header"]["msg_id"]
|
|
|
|
def input(self, string: str) -> None:
|
|
"""Send a string of raw input to the kernel.
|
|
|
|
This should only be called in response to the kernel sending an
|
|
``input_request`` message on the stdin channel.
|
|
"""
|
|
content = dict(value=string)
|
|
msg = self.session.msg("input_reply", content)
|
|
self.stdin_channel.send(msg)
|
|
|
|
def shutdown(self, restart: bool = False) -> str:
|
|
"""Request an immediate kernel shutdown on the control channel.
|
|
|
|
Upon receipt of the (empty) reply, client code can safely assume that
|
|
the kernel has shut down and it's safe to forcefully terminate it if
|
|
it's still alive.
|
|
|
|
The kernel will send the reply via a function registered with Python's
|
|
atexit module, ensuring it's truly done as the kernel is done with all
|
|
normal operation.
|
|
|
|
Returns
|
|
-------
|
|
The msg_id of the message sent
|
|
"""
|
|
# Send quit message to kernel. Once we implement kernel-side setattr,
|
|
# this should probably be done that way, but for now this will do.
|
|
msg = self.session.msg("shutdown_request", {"restart": restart})
|
|
self.control_channel.send(msg)
|
|
return msg["header"]["msg_id"]
|
|
|
|
|
|
KernelClientABC.register(KernelClient)
|