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"""A kernel manager for multiple kernels
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Authors:
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* Brian Granger
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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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import os
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import uuid
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import zmq
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from zmq.eventloop.zmqstream import ZMQStream
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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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#-----------------------------------------------------------------------------
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# Classes
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#-----------------------------------------------------------------------------
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class DuplicateKernelError(Exception):
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pass
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class MultiKernelManager(LoggingConfigurable):
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"""A class for managing multiple kernels."""
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kernel_manager_class = DottedObjectName(
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"IPython.kernel.blockingkernelmanager.BlockingKernelManager", 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, **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(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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# 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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config=self.config,
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)
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km.start_kernel(**kwargs)
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# start just the shell channel, needed for graceful restart
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km.start_channels(shell=True, iopub=False, stdin=False, hb=False)
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self._kernels[kernel_id] = km
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return kernel_id
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def shutdown_kernel(self, kernel_id, now=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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"""
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k = self.get_kernel(kernel_id)
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k.shutdown_kernel(now=now)
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k.shell_channel.stop()
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del self._kernels[kernel_id]
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def shutdown_all(self, now=False):
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"""Shutdown all kernels."""
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for kid in self.list_kernel_ids():
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self.shutdown_kernel(kid, now=now)
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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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return self.get_kernel(kernel_id).interrupt_kernel()
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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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return self.get_kernel(kernel_id).signal_kernel(signum)
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def restart_kernel(self, kernel_id):
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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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return self.get_kernel(kernel_id).restart_kernel()
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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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km = self._kernels.get(kernel_id)
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if km is not None:
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return km
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else:
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raise KeyError("Kernel with id not found: %s" % kernel_id)
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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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km = self.get_kernel(kernel_id)
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return dict(transport=km.transport,
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ip=km.ip,
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shell_port=km.shell_port,
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iopub_port=km.iopub_port,
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stdin_port=km.stdin_port,
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hb_port=km.hb_port,
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)
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def _make_url(self, transport, ip, port):
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"""Make a ZeroMQ URL for a given transport, ip and port."""
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if transport == 'tcp':
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return "tcp://%s:%i" % (ip, port)
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else:
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return "%s://%s-%s" % (transport, ip, port)
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def _create_connected_stream(self, kernel_id, socket_type, channel):
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"""Create a connected ZMQStream for a kernel."""
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cinfo = self.get_connection_info(kernel_id)
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url = self._make_url(cinfo['transport'], cinfo['ip'],
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cinfo['%s_port' % channel]
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)
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sock = self.context.socket(socket_type)
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self.log.info("Connecting to: %s" % url)
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sock.connect(url)
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return ZMQStream(sock)
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def create_iopub_stream(self, kernel_id):
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"""Return a ZMQStream object 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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Returns
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=======
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stream : ZMQStream
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"""
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iopub_stream = self._create_connected_stream(kernel_id, zmq.SUB, 'iopub')
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iopub_stream.socket.setsockopt(zmq.SUBSCRIBE, b'')
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return iopub_stream
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def create_shell_stream(self, kernel_id):
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"""Return a ZMQStream object 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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Returns
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=======
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stream : ZMQStream
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"""
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shell_stream = self._create_connected_stream(kernel_id, zmq.DEALER, 'shell')
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return shell_stream
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def create_hb_stream(self, kernel_id):
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"""Return a ZMQStream object 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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Returns
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=======
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stream : ZMQStream
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"""
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hb_stream = self._create_connected_stream(kernel_id, zmq.REQ, 'hb')
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return hb_stream
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