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"""A kernel manager for multiple kernels"""
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# Copyright (c) IPython Development Team.
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# Distributed under the terms of the Modified BSD License.
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from __future__ import absolute_import
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import os
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import uuid
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import zmq
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from IPython.config.configurable import LoggingConfigurable
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from IPython.utils.importstring import import_item
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from IPython.utils.traitlets import (
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Instance, Dict, Unicode, Any, DottedObjectName
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)
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from IPython.utils.py3compat import unicode_type
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from .kernelspec import NATIVE_KERNEL_NAME
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class DuplicateKernelError(Exception):
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pass
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def kernel_method(f):
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"""decorator for proxying MKM.method(kernel_id) to individual KMs by ID"""
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def wrapped(self, kernel_id, *args, **kwargs):
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# get the kernel
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km = self.get_kernel(kernel_id)
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method = getattr(km, f.__name__)
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# call the kernel's method
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r = method(*args, **kwargs)
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# last thing, call anything defined in the actual class method
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# such as logging messages
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f(self, kernel_id, *args, **kwargs)
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# return the method result
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return r
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return wrapped
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class MultiKernelManager(LoggingConfigurable):
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"""A class for managing multiple kernels."""
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default_kernel_name = Unicode(NATIVE_KERNEL_NAME, config=True,
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help="The name of the default kernel to start"
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)
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kernel_manager_class = DottedObjectName(
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"IPython.kernel.ioloop.IOLoopKernelManager", config=True,
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help="""The kernel manager class. This is configurable to allow
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subclassing of the KernelManager for customized behavior.
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"""
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)
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def _kernel_manager_class_changed(self, name, old, new):
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self.kernel_manager_factory = import_item(new)
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kernel_manager_factory = Any(help="this is kernel_manager_class after import")
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def _kernel_manager_factory_default(self):
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return import_item(self.kernel_manager_class)
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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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connection_dir = Unicode('')
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_kernels = Dict()
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def list_kernel_ids(self):
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"""Return a list of the kernel ids of the active kernels."""
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# Create a copy so we can iterate over kernels in operations
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# that delete keys.
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return list(self._kernels.keys())
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def __len__(self):
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"""Return the number of running kernels."""
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return len(self.list_kernel_ids())
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def __contains__(self, kernel_id):
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return kernel_id in self._kernels
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def start_kernel(self, kernel_name=None, **kwargs):
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"""Start a new kernel.
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The caller can pick a kernel_id by passing one in as a keyword arg,
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otherwise one will be picked using a uuid.
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To silence the kernel's stdout/stderr, call this using::
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km.start_kernel(stdout=PIPE, stderr=PIPE)
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"""
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kernel_id = kwargs.pop('kernel_id', unicode_type(uuid.uuid4()))
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if kernel_id in self:
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raise DuplicateKernelError('Kernel already exists: %s' % kernel_id)
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if kernel_name is None:
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kernel_name = self.default_kernel_name
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# kernel_manager_factory is the constructor for the KernelManager
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# subclass we are using. It can be configured as any Configurable,
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# including things like its transport and ip.
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km = self.kernel_manager_factory(connection_file=os.path.join(
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self.connection_dir, "kernel-%s.json" % kernel_id),
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parent=self, autorestart=True, log=self.log, kernel_name=kernel_name,
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)
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km.start_kernel(**kwargs)
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self._kernels[kernel_id] = km
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return kernel_id
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@kernel_method
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def shutdown_kernel(self, kernel_id, now=False, restart=False):
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"""Shutdown a kernel by its kernel uuid.
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Parameters
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==========
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kernel_id : uuid
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The id of the kernel to shutdown.
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now : bool
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Should the kernel be shutdown forcibly using a signal.
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restart : bool
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Will the kernel be restarted?
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"""
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self.log.info("Kernel shutdown: %s" % kernel_id)
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self.remove_kernel(kernel_id)
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@kernel_method
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def request_shutdown(self, kernel_id, restart=False):
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"""Ask a kernel to shut down by its kernel uuid"""
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@kernel_method
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def finish_shutdown(self, kernel_id, waittime=1, pollinterval=0.1):
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"""Wait for a kernel to finish shutting down, and kill it if it doesn't
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"""
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self.log.info("Kernel shutdown: %s" % kernel_id)
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@kernel_method
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def cleanup(self, kernel_id, connection_file=True):
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"""Clean up a kernel's resources"""
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def remove_kernel(self, kernel_id):
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"""remove a kernel from our mapping.
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Mainly so that a kernel can be removed if it is already dead,
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without having to call shutdown_kernel.
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The kernel object is returned.
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"""
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return self._kernels.pop(kernel_id)
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def shutdown_all(self, now=False):
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"""Shutdown all kernels."""
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kids = self.list_kernel_ids()
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for kid in kids:
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self.request_shutdown(kid)
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for kid in kids:
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self.finish_shutdown(kid)
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self.cleanup(kid)
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@kernel_method
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def interrupt_kernel(self, kernel_id):
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"""Interrupt (SIGINT) the kernel by its uuid.
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Parameters
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==========
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kernel_id : uuid
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The id of the kernel to interrupt.
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"""
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self.log.info("Kernel interrupted: %s" % kernel_id)
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@kernel_method
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def signal_kernel(self, kernel_id, signum):
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"""Sends a signal to the kernel by its uuid.
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Note that since only SIGTERM is supported on Windows, this function
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is only useful on Unix systems.
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Parameters
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==========
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kernel_id : uuid
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The id of the kernel to signal.
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"""
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self.log.info("Signaled Kernel %s with %s" % (kernel_id, signum))
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@kernel_method
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def restart_kernel(self, kernel_id, now=False):
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"""Restart a kernel by its uuid, keeping the same ports.
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Parameters
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==========
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kernel_id : uuid
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The id of the kernel to interrupt.
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"""
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self.log.info("Kernel restarted: %s" % kernel_id)
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@kernel_method
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def is_alive(self, kernel_id):
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"""Is the kernel alive.
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This calls KernelManager.is_alive() which calls Popen.poll on the
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actual kernel subprocess.
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Parameters
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==========
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kernel_id : uuid
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The id of the kernel.
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"""
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def _check_kernel_id(self, kernel_id):
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"""check that a kernel id is valid"""
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if kernel_id not in self:
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raise KeyError("Kernel with id not found: %s" % kernel_id)
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def get_kernel(self, kernel_id):
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"""Get the single KernelManager object for a kernel by its uuid.
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Parameters
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==========
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kernel_id : uuid
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The id of the kernel.
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"""
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self._check_kernel_id(kernel_id)
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return self._kernels[kernel_id]
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@kernel_method
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def add_restart_callback(self, kernel_id, callback, event='restart'):
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"""add a callback for the KernelRestarter"""
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@kernel_method
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def remove_restart_callback(self, kernel_id, callback, event='restart'):
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"""remove a callback for the KernelRestarter"""
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@kernel_method
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def get_connection_info(self, kernel_id):
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"""Return a dictionary of connection data for a kernel.
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Parameters
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==========
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kernel_id : uuid
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The id of the kernel.
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Returns
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=======
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connection_dict : dict
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A dict of the information needed to connect to a kernel.
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This includes the ip address and the integer port
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numbers of the different channels (stdin_port, iopub_port,
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shell_port, hb_port).
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"""
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@kernel_method
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def connect_iopub(self, kernel_id, identity=None):
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"""Return a zmq Socket connected to the iopub channel.
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Parameters
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==========
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kernel_id : uuid
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The id of the kernel
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identity : bytes (optional)
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The zmq identity of the socket
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Returns
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=======
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stream : zmq Socket or ZMQStream
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"""
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@kernel_method
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def connect_shell(self, kernel_id, identity=None):
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"""Return a zmq Socket connected to the shell channel.
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Parameters
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==========
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kernel_id : uuid
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The id of the kernel
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identity : bytes (optional)
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The zmq identity of the socket
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Returns
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=======
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stream : zmq Socket or ZMQStream
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"""
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@kernel_method
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def connect_stdin(self, kernel_id, identity=None):
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"""Return a zmq Socket connected to the stdin channel.
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Parameters
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==========
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kernel_id : uuid
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The id of the kernel
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identity : bytes (optional)
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The zmq identity of the socket
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Returns
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=======
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stream : zmq Socket or ZMQStream
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"""
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@kernel_method
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def connect_hb(self, kernel_id, identity=None):
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"""Return a zmq Socket connected to the hb channel.
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Parameters
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==========
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kernel_id : uuid
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The id of the kernel
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identity : bytes (optional)
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The zmq identity of the socket
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Returns
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=======
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stream : zmq Socket or ZMQStream
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"""
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