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103 lines
3.8 KiB
Python
103 lines
3.8 KiB
Python
"""A basic in process kernel monitor with autorestarting.
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This watches a kernel's state using KernelManager.is_alive and auto
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restarts the kernel if it dies.
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"""
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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 time
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import warnings
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from typing import Any
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from traitlets import Instance
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from ..restarter import KernelRestarter
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class IOLoopKernelRestarter(KernelRestarter):
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"""Monitor and autorestart a kernel."""
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loop = Instance("tornado.ioloop.IOLoop")
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def _loop_default(self) -> Any:
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warnings.warn(
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"IOLoopKernelRestarter.loop is deprecated in jupyter-client 5.2",
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DeprecationWarning,
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stacklevel=4,
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)
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from tornado import ioloop
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return ioloop.IOLoop.current()
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_pcallback = None
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def start(self) -> None:
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"""Start the polling of the kernel."""
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if self._pcallback is None:
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from tornado.ioloop import PeriodicCallback
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self._pcallback = PeriodicCallback(
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self.poll,
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1000 * self.time_to_dead,
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)
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self._pcallback.start()
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def stop(self) -> None:
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"""Stop the kernel polling."""
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if self._pcallback is not None:
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self._pcallback.stop()
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self._pcallback = None
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class AsyncIOLoopKernelRestarter(IOLoopKernelRestarter):
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"""An async io loop kernel restarter."""
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async def poll(self) -> None: # type:ignore[override]
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"""Poll the kernel."""
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if self.debug:
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self.log.debug("Polling kernel...")
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is_alive = await self.kernel_manager.is_alive()
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now = time.time()
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if not is_alive:
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self._last_dead = now
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if self._restarting:
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self._restart_count += 1
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else:
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self._restart_count = 1
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if self._restart_count > self.restart_limit:
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self.log.warning("AsyncIOLoopKernelRestarter: restart failed")
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self._fire_callbacks("dead")
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self._restarting = False
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self._restart_count = 0
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self.stop()
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else:
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newports = self.random_ports_until_alive and self._initial_startup
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self.log.info(
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"AsyncIOLoopKernelRestarter: restarting kernel (%i/%i), %s random ports",
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self._restart_count,
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self.restart_limit,
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"new" if newports else "keep",
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)
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self._fire_callbacks("restart")
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await self.kernel_manager.restart_kernel(now=True, newports=newports)
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self._restarting = True
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else:
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# Since `is_alive` only tests that the kernel process is alive, it does not
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# indicate that the kernel has successfully completed startup. To solve this
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# correctly, we would need to wait for a kernel info reply, but it is not
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# necessarily appropriate to start a kernel client + channels in the
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# restarter. Therefore, we use "has been alive continuously for X time" as a
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# heuristic for a stable start up.
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# See https://github.com/jupyter/jupyter_client/pull/717 for details.
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stable_start_time = self.stable_start_time
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if self.kernel_manager.provisioner:
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stable_start_time = self.kernel_manager.provisioner.get_stable_start_time(
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recommended=stable_start_time
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)
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if self._initial_startup and now - self._last_dead >= stable_start_time:
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self._initial_startup = False
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if self._restarting and now - self._last_dead >= stable_start_time:
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self.log.debug("AsyncIOLoopKernelRestarter: restart apparently succeeded")
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self._restarting = False
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