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717 lines
26 KiB
717 lines
26 KiB
"""Base class to manage 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 functools
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import os
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import re
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import signal
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import sys
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import typing as t
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import uuid
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from asyncio.futures import Future
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from concurrent.futures import Future as CFuture
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from contextlib import contextmanager
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from enum import Enum
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import zmq
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from traitlets import Any
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from traitlets import Bool
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from traitlets import default
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from traitlets import DottedObjectName
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from traitlets import Float
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from traitlets import Instance
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from traitlets import observe
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from traitlets import observe_compat
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from traitlets import Type
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from traitlets import Unicode
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from traitlets.utils.importstring import import_item
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from .connect import ConnectionFileMixin
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from .managerabc import KernelManagerABC
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from .provisioning import KernelProvisionerBase
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from .provisioning import KernelProvisionerFactory as KPF
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from .utils import ensure_async
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from .utils import run_sync
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from jupyter_client import KernelClient
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from jupyter_client import kernelspec
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class _ShutdownStatus(Enum):
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"""
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This is so far used only for testing in order to track the internal state of
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the shutdown logic, and verifying which path is taken for which
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missbehavior.
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"""
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Unset = None
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ShutdownRequest = "ShutdownRequest"
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SigtermRequest = "SigtermRequest"
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SigkillRequest = "SigkillRequest"
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F = t.TypeVar('F', bound=t.Callable[..., t.Any])
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def in_pending_state(method: F) -> F:
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"""Sets the kernel to a pending state by
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creating a fresh Future for the KernelManager's `ready`
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attribute. Once the method is finished, set the Future's results.
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"""
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@t.no_type_check
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@functools.wraps(method)
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async def wrapper(self, *args, **kwargs):
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# Create a future for the decorated method
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try:
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self._ready = Future()
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except RuntimeError:
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# No event loop running, use concurrent future
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self._ready = CFuture()
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try:
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# call wrapped method, await, and set the result or exception.
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out = await method(self, *args, **kwargs)
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# Add a small sleep to ensure tests can capture the state before done
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await asyncio.sleep(0.01)
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self._ready.set_result(None)
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return out
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except Exception as e:
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self._ready.set_exception(e)
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self.log.exception(self._ready.exception())
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raise e
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return t.cast(F, wrapper)
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class KernelManager(ConnectionFileMixin):
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"""Manages a single kernel in a subprocess on this host.
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This version starts kernels with Popen.
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"""
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_ready: t.Union[Future, CFuture]
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def __init__(self, *args, **kwargs):
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super().__init__(**kwargs)
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self._shutdown_status = _ShutdownStatus.Unset
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# Create a place holder future.
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try:
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asyncio.get_running_loop()
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self._ready = Future()
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except RuntimeError:
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# No event loop running, use concurrent future
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self._ready = CFuture()
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_created_context: Bool = Bool(False)
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# The PyZMQ Context to use for communication with the kernel.
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context: Instance = Instance(zmq.Context)
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@default("context") # type:ignore[misc]
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def _context_default(self) -> zmq.Context:
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self._created_context = True
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return zmq.Context()
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# the class to create with our `client` method
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client_class: DottedObjectName = DottedObjectName(
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"jupyter_client.blocking.BlockingKernelClient"
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)
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client_factory: Type = Type(klass="jupyter_client.KernelClient")
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@default("client_factory") # type:ignore[misc]
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def _client_factory_default(self) -> Type:
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return import_item(self.client_class)
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@observe("client_class") # type:ignore[misc]
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def _client_class_changed(self, change: t.Dict[str, DottedObjectName]) -> None:
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self.client_factory = import_item(str(change["new"]))
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kernel_id: str = Unicode(None, allow_none=True)
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# The kernel provisioner with which this KernelManager is communicating.
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# This will generally be a LocalProvisioner instance unless the kernelspec
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# indicates otherwise.
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provisioner: t.Optional[KernelProvisionerBase] = None
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kernel_spec_manager: Instance = Instance(kernelspec.KernelSpecManager)
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@default("kernel_spec_manager") # type:ignore[misc]
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def _kernel_spec_manager_default(self) -> kernelspec.KernelSpecManager:
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return kernelspec.KernelSpecManager(data_dir=self.data_dir)
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@observe("kernel_spec_manager") # type:ignore[misc]
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@observe_compat # type:ignore[misc]
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def _kernel_spec_manager_changed(self, change: t.Dict[str, Instance]) -> None:
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self._kernel_spec = None
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shutdown_wait_time: Float = Float(
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5.0,
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config=True,
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help="Time to wait for a kernel to terminate before killing it, "
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"in seconds. When a shutdown request is initiated, the kernel "
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"will be immediately sent an interrupt (SIGINT), followed"
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"by a shutdown_request message, after 1/2 of `shutdown_wait_time`"
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"it will be sent a terminate (SIGTERM) request, and finally at "
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"the end of `shutdown_wait_time` will be killed (SIGKILL). terminate "
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"and kill may be equivalent on windows. Note that this value can be"
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"overridden by the in-use kernel provisioner since shutdown times may"
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"vary by provisioned environment.",
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)
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kernel_name: Unicode = Unicode(kernelspec.NATIVE_KERNEL_NAME)
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@observe("kernel_name") # type:ignore[misc]
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def _kernel_name_changed(self, change: t.Dict[str, Unicode]) -> None:
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self._kernel_spec = None
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if change["new"] == "python":
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self.kernel_name = kernelspec.NATIVE_KERNEL_NAME
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_kernel_spec: t.Optional[kernelspec.KernelSpec] = None
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@property
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def kernel_spec(self) -> t.Optional[kernelspec.KernelSpec]:
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if self._kernel_spec is None and self.kernel_name != "":
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self._kernel_spec = self.kernel_spec_manager.get_kernel_spec(self.kernel_name)
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return self._kernel_spec
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cache_ports: Bool = Bool(
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help="True if the MultiKernelManager should cache ports for this KernelManager instance"
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)
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@default("cache_ports") # type:ignore[misc]
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def _default_cache_ports(self) -> bool:
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return self.transport == "tcp"
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@property
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def ready(self) -> t.Union[CFuture, Future]:
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"""A future that resolves when the kernel process has started for the first time"""
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return self._ready
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@property
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def ipykernel(self) -> bool:
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return self.kernel_name in {"python", "python2", "python3"}
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# Protected traits
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_launch_args: Any = Any()
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_control_socket: Any = Any()
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_restarter: Any = Any()
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autorestart: Bool = Bool(
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True, config=True, help="""Should we autorestart the kernel if it dies."""
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)
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shutting_down: bool = False
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def __del__(self) -> None:
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self._close_control_socket()
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self.cleanup_connection_file()
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# --------------------------------------------------------------------------
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# Kernel restarter
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# --------------------------------------------------------------------------
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def start_restarter(self) -> None:
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pass
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def stop_restarter(self) -> None:
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pass
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def add_restart_callback(self, callback: t.Callable, event: str = "restart") -> None:
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"""register a callback to be called when a kernel is restarted"""
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if self._restarter is None:
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return
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self._restarter.add_callback(callback, event)
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def remove_restart_callback(self, callback: t.Callable, event: str = "restart") -> None:
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"""unregister a callback to be called when a kernel is restarted"""
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if self._restarter is None:
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return
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self._restarter.remove_callback(callback, event)
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# --------------------------------------------------------------------------
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# create a Client connected to our Kernel
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# --------------------------------------------------------------------------
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def client(self, **kwargs: t.Any) -> KernelClient:
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"""Create a client configured to connect to our kernel"""
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kw = {}
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kw.update(self.get_connection_info(session=True))
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kw.update(
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dict(
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connection_file=self.connection_file,
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parent=self,
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)
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)
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# add kwargs last, for manual overrides
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kw.update(kwargs)
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return self.client_factory(**kw)
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# --------------------------------------------------------------------------
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# Kernel management
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# --------------------------------------------------------------------------
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def format_kernel_cmd(self, extra_arguments: t.Optional[t.List[str]] = None) -> t.List[str]:
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"""replace templated args (e.g. {connection_file})"""
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extra_arguments = extra_arguments or []
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assert self.kernel_spec is not None
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cmd = self.kernel_spec.argv + extra_arguments
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if cmd and cmd[0] in {
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"python",
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"python%i" % sys.version_info[0],
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"python%i.%i" % sys.version_info[:2],
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}:
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# executable is 'python' or 'python3', use sys.executable.
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# These will typically be the same,
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# but if the current process is in an env
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# and has been launched by abspath without
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# activating the env, python on PATH may not be sys.executable,
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# but it should be.
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cmd[0] = sys.executable
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# Make sure to use the realpath for the connection_file
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# On windows, when running with the store python, the connection_file path
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# is not usable by non python kernels because the path is being rerouted when
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# inside of a store app.
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# See this bug here: https://bugs.python.org/issue41196
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ns = dict(
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connection_file=os.path.realpath(self.connection_file),
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prefix=sys.prefix,
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)
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if self.kernel_spec:
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ns["resource_dir"] = self.kernel_spec.resource_dir
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ns.update(self._launch_args)
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pat = re.compile(r"\{([A-Za-z0-9_]+)\}")
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def from_ns(match):
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"""Get the key out of ns if it's there, otherwise no change."""
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return ns.get(match.group(1), match.group())
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return [pat.sub(from_ns, arg) for arg in cmd]
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async def _async_launch_kernel(self, kernel_cmd: t.List[str], **kw: t.Any) -> None:
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"""actually launch the kernel
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override in a subclass to launch kernel subprocesses differently
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Note that provisioners can now be used to customize kernel environments
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and
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"""
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assert self.provisioner is not None
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connection_info = await self.provisioner.launch_kernel(kernel_cmd, **kw)
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assert self.provisioner.has_process
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# Provisioner provides the connection information. Load into kernel manager and write file.
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self._force_connection_info(connection_info)
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_launch_kernel = run_sync(_async_launch_kernel)
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# Control socket used for polite kernel shutdown
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def _connect_control_socket(self) -> None:
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if self._control_socket is None:
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self._control_socket = self._create_connected_socket("control")
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self._control_socket.linger = 100
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def _close_control_socket(self) -> None:
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if self._control_socket is None:
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return
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self._control_socket.close()
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self._control_socket = None
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async def _async_pre_start_kernel(
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self, **kw: t.Any
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) -> t.Tuple[t.List[str], t.Dict[str, t.Any]]:
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"""Prepares a kernel for startup in a separate process.
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If random ports (port=0) are being used, this method must be called
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before the channels are created.
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Parameters
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----------
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`**kw` : optional
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keyword arguments that are passed down to build the kernel_cmd
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and launching the kernel (e.g. Popen kwargs).
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"""
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self.shutting_down = False
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self.kernel_id = self.kernel_id or kw.pop('kernel_id', str(uuid.uuid4()))
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# save kwargs for use in restart
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self._launch_args = kw.copy()
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if self.provisioner is None: # will not be None on restarts
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self.provisioner = KPF.instance(parent=self.parent).create_provisioner_instance(
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self.kernel_id,
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self.kernel_spec,
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parent=self,
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)
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kw = await self.provisioner.pre_launch(**kw)
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kernel_cmd = kw.pop('cmd')
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return kernel_cmd, kw
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pre_start_kernel = run_sync(_async_pre_start_kernel)
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async def _async_post_start_kernel(self, **kw: t.Any) -> None:
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"""Performs any post startup tasks relative to the kernel.
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Parameters
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----------
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`**kw` : optional
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keyword arguments that were used in the kernel process's launch.
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"""
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self.start_restarter()
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self._connect_control_socket()
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assert self.provisioner is not None
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await self.provisioner.post_launch(**kw)
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post_start_kernel = run_sync(_async_post_start_kernel)
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@in_pending_state
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async def _async_start_kernel(self, **kw: t.Any) -> None:
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"""Starts a kernel on this host in a separate process.
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If random ports (port=0) are being used, this method must be called
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before the channels are created.
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Parameters
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----------
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`**kw` : optional
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keyword arguments that are passed down to build the kernel_cmd
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and launching the kernel (e.g. Popen kwargs).
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"""
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kernel_cmd, kw = await ensure_async(self.pre_start_kernel(**kw))
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# launch the kernel subprocess
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self.log.debug("Starting kernel: %s", kernel_cmd)
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await ensure_async(self._launch_kernel(kernel_cmd, **kw))
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await ensure_async(self.post_start_kernel(**kw))
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start_kernel = run_sync(_async_start_kernel)
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async def _async_request_shutdown(self, restart: bool = False) -> None:
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"""Send a shutdown request via control channel"""
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content = dict(restart=restart)
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msg = self.session.msg("shutdown_request", content=content)
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# ensure control socket is connected
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self._connect_control_socket()
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self.session.send(self._control_socket, msg)
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assert self.provisioner is not None
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await self.provisioner.shutdown_requested(restart=restart)
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self._shutdown_status = _ShutdownStatus.ShutdownRequest
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request_shutdown = run_sync(_async_request_shutdown)
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async def _async_finish_shutdown(
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self,
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waittime: t.Optional[float] = None,
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pollinterval: float = 0.1,
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restart: t.Optional[bool] = False,
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) -> None:
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"""Wait for kernel shutdown, then kill process if it doesn't shutdown.
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This does not send shutdown requests - use :meth:`request_shutdown`
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first.
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"""
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if waittime is None:
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waittime = max(self.shutdown_wait_time, 0)
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if self.provisioner: # Allow provisioner to override
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waittime = self.provisioner.get_shutdown_wait_time(recommended=waittime)
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try:
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await asyncio.wait_for(
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self._async_wait(pollinterval=pollinterval), timeout=waittime / 2
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)
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except asyncio.TimeoutError:
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self.log.debug("Kernel is taking too long to finish, terminating")
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self._shutdown_status = _ShutdownStatus.SigtermRequest
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await ensure_async(self._send_kernel_sigterm())
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try:
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await asyncio.wait_for(
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self._async_wait(pollinterval=pollinterval), timeout=waittime / 2
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)
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except asyncio.TimeoutError:
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self.log.debug("Kernel is taking too long to finish, killing")
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self._shutdown_status = _ShutdownStatus.SigkillRequest
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await ensure_async(self._kill_kernel(restart=restart))
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else:
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# Process is no longer alive, wait and clear
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if self.has_kernel:
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assert self.provisioner is not None
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await self.provisioner.wait()
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finish_shutdown = run_sync(_async_finish_shutdown)
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async def _async_cleanup_resources(self, restart: bool = False) -> None:
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"""Clean up resources when the kernel is shut down"""
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if not restart:
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self.cleanup_connection_file()
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self.cleanup_ipc_files()
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self._close_control_socket()
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self.session.parent = None
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if self._created_context and not restart:
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self.context.destroy(linger=100)
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if self.provisioner:
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await self.provisioner.cleanup(restart=restart)
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cleanup_resources = run_sync(_async_cleanup_resources)
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@in_pending_state
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async def _async_shutdown_kernel(self, now: bool = False, restart: bool = False) -> None:
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"""Attempts to stop the kernel process cleanly.
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This attempts to shutdown the kernels cleanly by:
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1. Sending it a shutdown message over the control channel.
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2. If that fails, the kernel is shutdown forcibly by sending it
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a signal.
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Parameters
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----------
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now : bool
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Should the kernel be forcible killed *now*. This skips the
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first, nice shutdown attempt.
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restart: bool
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Will this kernel be restarted after it is shutdown. When this
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is True, connection files will not be cleaned up.
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"""
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self.shutting_down = True # Used by restarter to prevent race condition
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# Stop monitoring for restarting while we shutdown.
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self.stop_restarter()
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if self.has_kernel:
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await ensure_async(self.interrupt_kernel())
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if now:
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await ensure_async(self._kill_kernel())
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else:
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await ensure_async(self.request_shutdown(restart=restart))
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# Don't send any additional kernel kill messages immediately, to give
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# the kernel a chance to properly execute shutdown actions. Wait for at
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# most 1s, checking every 0.1s.
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await ensure_async(self.finish_shutdown(restart=restart))
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await ensure_async(self.cleanup_resources(restart=restart))
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shutdown_kernel = run_sync(_async_shutdown_kernel)
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async def _async_restart_kernel(
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self, now: bool = False, newports: bool = False, **kw: t.Any
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) -> None:
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"""Restarts a kernel with the arguments that were used to launch it.
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Parameters
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----------
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now : bool, optional
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If True, the kernel is forcefully restarted *immediately*, without
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having a chance to do any cleanup action. Otherwise the kernel is
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given 1s to clean up before a forceful restart is issued.
|
|
|
|
In all cases the kernel is restarted, the only difference is whether
|
|
it is given a chance to perform a clean shutdown or not.
|
|
|
|
newports : bool, optional
|
|
If the old kernel was launched with random ports, this flag decides
|
|
whether the same ports and connection file will be used again.
|
|
If False, the same ports and connection file are used. This is
|
|
the default. If True, new random port numbers are chosen and a
|
|
new connection file is written. It is still possible that the newly
|
|
chosen random port numbers happen to be the same as the old ones.
|
|
|
|
`**kw` : optional
|
|
Any options specified here will overwrite those used to launch the
|
|
kernel.
|
|
"""
|
|
if self._launch_args is None:
|
|
raise RuntimeError("Cannot restart the kernel. No previous call to 'start_kernel'.")
|
|
|
|
# Stop currently running kernel.
|
|
await ensure_async(self.shutdown_kernel(now=now, restart=True))
|
|
|
|
if newports:
|
|
self.cleanup_random_ports()
|
|
|
|
# Start new kernel.
|
|
self._launch_args.update(kw)
|
|
await ensure_async(self.start_kernel(**self._launch_args))
|
|
|
|
restart_kernel = run_sync(_async_restart_kernel)
|
|
|
|
@property
|
|
def has_kernel(self) -> bool:
|
|
"""Has a kernel process been started that we are actively managing."""
|
|
return self.provisioner is not None and self.provisioner.has_process
|
|
|
|
async def _async_send_kernel_sigterm(self, restart: bool = False) -> None:
|
|
"""similar to _kill_kernel, but with sigterm (not sigkill), but do not block"""
|
|
if self.has_kernel:
|
|
assert self.provisioner is not None
|
|
await self.provisioner.terminate(restart=restart)
|
|
|
|
_send_kernel_sigterm = run_sync(_async_send_kernel_sigterm)
|
|
|
|
async def _async_kill_kernel(self, restart: bool = False) -> None:
|
|
"""Kill the running kernel.
|
|
|
|
This is a private method, callers should use shutdown_kernel(now=True).
|
|
"""
|
|
if self.has_kernel:
|
|
assert self.provisioner is not None
|
|
await self.provisioner.kill(restart=restart)
|
|
|
|
# Wait until the kernel terminates.
|
|
try:
|
|
await asyncio.wait_for(self._async_wait(), timeout=5.0)
|
|
except asyncio.TimeoutError:
|
|
# Wait timed out, just log warning but continue - not much more we can do.
|
|
self.log.warning("Wait for final termination of kernel timed out - continuing...")
|
|
pass
|
|
else:
|
|
# Process is no longer alive, wait and clear
|
|
if self.has_kernel:
|
|
await self.provisioner.wait()
|
|
|
|
_kill_kernel = run_sync(_async_kill_kernel)
|
|
|
|
async def _async_interrupt_kernel(self) -> None:
|
|
"""Interrupts the kernel by sending it a signal.
|
|
|
|
Unlike ``signal_kernel``, this operation is well supported on all
|
|
platforms.
|
|
"""
|
|
if self.has_kernel:
|
|
assert self.kernel_spec is not None
|
|
interrupt_mode = self.kernel_spec.interrupt_mode
|
|
if interrupt_mode == "signal":
|
|
await ensure_async(self.signal_kernel(signal.SIGINT))
|
|
|
|
elif interrupt_mode == "message":
|
|
msg = self.session.msg("interrupt_request", content={})
|
|
self._connect_control_socket()
|
|
self.session.send(self._control_socket, msg)
|
|
else:
|
|
raise RuntimeError("Cannot interrupt kernel. No kernel is running!")
|
|
|
|
interrupt_kernel = run_sync(_async_interrupt_kernel)
|
|
|
|
async def _async_signal_kernel(self, signum: int) -> None:
|
|
"""Sends a signal to the process group of the kernel (this
|
|
usually includes the kernel and any subprocesses spawned by
|
|
the kernel).
|
|
|
|
Note that since only SIGTERM is supported on Windows, this function is
|
|
only useful on Unix systems.
|
|
"""
|
|
if self.has_kernel:
|
|
assert self.provisioner is not None
|
|
await self.provisioner.send_signal(signum)
|
|
else:
|
|
raise RuntimeError("Cannot signal kernel. No kernel is running!")
|
|
|
|
signal_kernel = run_sync(_async_signal_kernel)
|
|
|
|
async def _async_is_alive(self) -> bool:
|
|
"""Is the kernel process still running?"""
|
|
if self.has_kernel:
|
|
assert self.provisioner is not None
|
|
ret = await self.provisioner.poll()
|
|
if ret is None:
|
|
return True
|
|
return False
|
|
|
|
is_alive = run_sync(_async_is_alive)
|
|
|
|
async def _async_wait(self, pollinterval: float = 0.1) -> None:
|
|
# Use busy loop at 100ms intervals, polling until the process is
|
|
# not alive. If we find the process is no longer alive, complete
|
|
# its cleanup via the blocking wait(). Callers are responsible for
|
|
# issuing calls to wait() using a timeout (see _kill_kernel()).
|
|
while await ensure_async(self.is_alive()):
|
|
await asyncio.sleep(pollinterval)
|
|
|
|
|
|
class AsyncKernelManager(KernelManager):
|
|
# the class to create with our `client` method
|
|
client_class: DottedObjectName = DottedObjectName(
|
|
"jupyter_client.asynchronous.AsyncKernelClient"
|
|
)
|
|
client_factory: Type = Type(klass="jupyter_client.asynchronous.AsyncKernelClient")
|
|
|
|
_launch_kernel = KernelManager._async_launch_kernel
|
|
start_kernel = KernelManager._async_start_kernel
|
|
pre_start_kernel = KernelManager._async_pre_start_kernel
|
|
post_start_kernel = KernelManager._async_post_start_kernel
|
|
request_shutdown = KernelManager._async_request_shutdown
|
|
finish_shutdown = KernelManager._async_finish_shutdown
|
|
cleanup_resources = KernelManager._async_cleanup_resources
|
|
shutdown_kernel = KernelManager._async_shutdown_kernel
|
|
restart_kernel = KernelManager._async_restart_kernel
|
|
_send_kernel_sigterm = KernelManager._async_send_kernel_sigterm
|
|
_kill_kernel = KernelManager._async_kill_kernel
|
|
interrupt_kernel = KernelManager._async_interrupt_kernel
|
|
signal_kernel = KernelManager._async_signal_kernel
|
|
is_alive = KernelManager._async_is_alive
|
|
|
|
|
|
KernelManagerABC.register(KernelManager)
|
|
|
|
|
|
def start_new_kernel(
|
|
startup_timeout: float = 60, kernel_name: str = "python", **kwargs: t.Any
|
|
) -> t.Tuple[KernelManager, KernelClient]:
|
|
"""Start a new kernel, and return its Manager and Client"""
|
|
km = KernelManager(kernel_name=kernel_name)
|
|
km.start_kernel(**kwargs)
|
|
kc = km.client()
|
|
kc.start_channels()
|
|
try:
|
|
kc.wait_for_ready(timeout=startup_timeout)
|
|
except RuntimeError:
|
|
kc.stop_channels()
|
|
km.shutdown_kernel()
|
|
raise
|
|
|
|
return km, kc
|
|
|
|
|
|
async def start_new_async_kernel(
|
|
startup_timeout: float = 60, kernel_name: str = "python", **kwargs: t.Any
|
|
) -> t.Tuple[AsyncKernelManager, KernelClient]:
|
|
"""Start a new kernel, and return its Manager and Client"""
|
|
km = AsyncKernelManager(kernel_name=kernel_name)
|
|
await km.start_kernel(**kwargs)
|
|
kc = km.client()
|
|
kc.start_channels()
|
|
try:
|
|
await kc.wait_for_ready(timeout=startup_timeout)
|
|
except RuntimeError:
|
|
kc.stop_channels()
|
|
await km.shutdown_kernel()
|
|
raise
|
|
|
|
return (km, kc)
|
|
|
|
|
|
@contextmanager
|
|
def run_kernel(**kwargs: t.Any) -> t.Iterator[KernelClient]:
|
|
"""Context manager to create a kernel in a subprocess.
|
|
|
|
The kernel is shut down when the context exits.
|
|
|
|
Returns
|
|
-------
|
|
kernel_client: connected KernelClient instance
|
|
"""
|
|
km, kc = start_new_kernel(**kwargs)
|
|
try:
|
|
yield kc
|
|
finally:
|
|
kc.stop_channels()
|
|
km.shutdown_kernel(now=True)
|