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"""Base class to manage a running kernel
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"""
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#-----------------------------------------------------------------------------
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# Copyright (C) 2013 The IPython Development Team
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#
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# Distributed under the terms of the BSD License. The full license is in
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# the file COPYING, distributed as part of this software.
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#-----------------------------------------------------------------------------
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#-----------------------------------------------------------------------------
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# Imports
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#-----------------------------------------------------------------------------
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from __future__ import absolute_import
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# Standard library imports
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import signal
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import sys
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import time
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import zmq
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# Local imports
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from IPython.config.configurable import LoggingConfigurable
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from IPython.utils.localinterfaces import LOCAL_IPS
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from IPython.utils.traitlets import (
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Any, Instance, Unicode, List, Bool,
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)
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from IPython.kernel import (
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make_ipkernel_cmd,
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launch_kernel,
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)
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from .connect import ConnectionFileMixin
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from .zmq.session import Session
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from .managerabc import (
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KernelManagerABC
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)
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#-----------------------------------------------------------------------------
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# Main kernel manager class
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#-----------------------------------------------------------------------------
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class KernelManager(LoggingConfigurable, 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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# The PyZMQ Context to use for communication with the kernel.
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context = Instance(zmq.Context)
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def _context_default(self):
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return zmq.Context.instance()
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# The Session to use for communication with the kernel.
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session = Instance(Session)
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def _session_default(self):
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return Session(config=self.config)
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# The kernel process with which the KernelManager is communicating.
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# generally a Popen instance
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kernel = Any()
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kernel_cmd = List(Unicode, config=True,
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help="""The Popen Command to launch the kernel.
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Override this if you have a custom
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"""
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)
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def _kernel_cmd_changed(self, name, old, new):
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self.ipython_kernel = False
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ipython_kernel = Bool(True)
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# Protected traits
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_launch_args = Any
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autorestart = Bool(False, config=True,
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help="""Should we autorestart the kernel if it dies."""
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)
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def __del__(self):
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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):
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pass
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def stop_restarter(self):
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pass
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#--------------------------------------------------------------------------
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# Kernel management
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#--------------------------------------------------------------------------
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def format_kernel_cmd(self, **kw):
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"""format templated args (e.g. {connection_file})"""
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if self.kernel_cmd:
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cmd = self.kernel_cmd
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else:
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cmd = make_ipkernel_cmd(
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'from IPython.kernel.zmq.kernelapp import main; main()',
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**kw
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)
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ns = dict(connection_file=self.connection_file)
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ns.update(self._launch_args)
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return [ c.format(**ns) for c in cmd ]
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def _launch_kernel(self, kernel_cmd, **kw):
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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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"""
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return launch_kernel(kernel_cmd, **kw)
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def start_kernel(self, **kw):
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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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if self.transport == 'tcp' and self.ip not in LOCAL_IPS:
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raise RuntimeError("Can only launch a kernel on a local interface. "
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"Make sure that the '*_address' attributes are "
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"configured properly. "
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"Currently valid addresses are: %s"%LOCAL_IPS
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)
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# write connection file / get default ports
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self.write_connection_file()
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# save kwargs for use in restart
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self._launch_args = kw.copy()
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# build the Popen cmd
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kernel_cmd = self.format_kernel_cmd(**kw)
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# launch the kernel subprocess
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self.kernel = self._launch_kernel(kernel_cmd,
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ipython_kernel=self.ipython_kernel,
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**kw)
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self.start_restarter()
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def _send_shutdown_request(self, restart=False):
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"""TODO: send a shutdown request via control channel"""
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raise NotImplementedError("Soft shutdown needs control channel")
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def shutdown_kernel(self, now=False, restart=False):
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"""Attempts to the 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 shell 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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# Stop monitoring for restarting while we shutdown.
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self.stop_restarter()
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# FIXME: Shutdown does not work on Windows due to ZMQ errors!
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if sys.platform == 'win32':
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self._kill_kernel()
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return
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# bypass clean shutdown while
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# FIXME: add control channel for clean shutdown
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now = True
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if now:
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if self.has_kernel:
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self._kill_kernel()
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else:
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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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# FIXME: this method is not yet implemented (need Control channel)
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self._send_shutdown_request(restart=restart)
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for i in range(10):
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if self.is_alive():
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time.sleep(0.1)
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else:
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break
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else:
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# OK, we've waited long enough.
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if self.has_kernel:
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self._kill_kernel()
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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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else:
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self.cleanup_ipc_files()
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def restart_kernel(self, now=False, **kw):
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"""Restarts a kernel with the arguments that were used to launch it.
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If the old kernel was launched with random ports, the same ports will be
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used for the new kernel. The same connection file is used again.
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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.
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In all cases the kernel is restarted, the only difference is whether
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it is given a chance to perform a clean shutdown or not.
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**kw : optional
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Any options specified here will overwrite those used to launch the
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kernel.
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"""
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if self._launch_args is None:
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raise RuntimeError("Cannot restart the kernel. "
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"No previous call to 'start_kernel'.")
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else:
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# Stop currently running kernel.
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self.shutdown_kernel(now=now, restart=True)
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# Start new kernel.
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self._launch_args.update(kw)
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self.start_kernel(**self._launch_args)
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# FIXME: Messages get dropped in Windows due to probable ZMQ bug
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# unless there is some delay here.
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if sys.platform == 'win32':
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time.sleep(0.2)
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@property
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def has_kernel(self):
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"""Has a kernel been started that we are managing."""
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return self.kernel is not None
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def _kill_kernel(self):
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"""Kill the running kernel.
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This is a private method, callers should use shutdown_kernel(now=True).
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"""
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if self.has_kernel:
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# Signal the kernel to terminate (sends SIGKILL on Unix and calls
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# TerminateProcess() on Win32).
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try:
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self.kernel.kill()
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except OSError as e:
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# In Windows, we will get an Access Denied error if the process
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# has already terminated. Ignore it.
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if sys.platform == 'win32':
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if e.winerror != 5:
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raise
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# On Unix, we may get an ESRCH error if the process has already
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# terminated. Ignore it.
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else:
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from errno import ESRCH
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if e.errno != ESRCH:
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raise
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# Block until the kernel terminates.
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self.kernel.wait()
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self.kernel = None
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else:
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raise RuntimeError("Cannot kill kernel. No kernel is running!")
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def interrupt_kernel(self):
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"""Interrupts the kernel by sending it a signal.
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Unlike ``signal_kernel``, this operation is well supported on all
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platforms.
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"""
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if self.has_kernel:
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if sys.platform == 'win32':
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from .zmq.parentpoller import ParentPollerWindows as Poller
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Poller.send_interrupt(self.kernel.win32_interrupt_event)
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else:
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self.kernel.send_signal(signal.SIGINT)
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else:
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raise RuntimeError("Cannot interrupt kernel. No kernel is running!")
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def signal_kernel(self, signum):
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"""Sends a signal to the kernel.
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Note that since only SIGTERM is supported on Windows, this function is
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only useful on Unix systems.
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"""
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if self.has_kernel:
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self.kernel.send_signal(signum)
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else:
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raise RuntimeError("Cannot signal kernel. No kernel is running!")
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def is_alive(self):
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"""Is the kernel process still running?"""
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if self.has_kernel:
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if self.kernel.poll() is None:
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return True
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else:
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return False
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else:
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# we don't have a kernel
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return False
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#-----------------------------------------------------------------------------
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# ABC Registration
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#-----------------------------------------------------------------------------
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KernelManagerABC.register(KernelManager)
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