|
|
"""A kernel manager for multiple kernels
|
|
|
|
|
|
Authors:
|
|
|
|
|
|
* Brian Granger
|
|
|
"""
|
|
|
|
|
|
#-----------------------------------------------------------------------------
|
|
|
# Copyright (C) 2013 The IPython Development Team
|
|
|
#
|
|
|
# Distributed under the terms of the BSD License. The full license is in
|
|
|
# the file COPYING, distributed as part of this software.
|
|
|
#-----------------------------------------------------------------------------
|
|
|
|
|
|
#-----------------------------------------------------------------------------
|
|
|
# Imports
|
|
|
#-----------------------------------------------------------------------------
|
|
|
|
|
|
from __future__ import absolute_import
|
|
|
|
|
|
import os
|
|
|
import uuid
|
|
|
|
|
|
import zmq
|
|
|
from zmq.eventloop.zmqstream import ZMQStream
|
|
|
|
|
|
from IPython.config.configurable import LoggingConfigurable
|
|
|
from IPython.utils.importstring import import_item
|
|
|
from IPython.utils.traitlets import (
|
|
|
Instance, Dict, Unicode, Any, DottedObjectName, Bool
|
|
|
)
|
|
|
|
|
|
#-----------------------------------------------------------------------------
|
|
|
# Classes
|
|
|
#-----------------------------------------------------------------------------
|
|
|
|
|
|
class DuplicateKernelError(Exception):
|
|
|
pass
|
|
|
|
|
|
|
|
|
class MultiKernelManager(LoggingConfigurable):
|
|
|
"""A class for managing multiple kernels."""
|
|
|
|
|
|
kernel_manager_class = DottedObjectName(
|
|
|
"IPython.kernel.ioloopkernelmanager.IOLoopKernelManager", config=True,
|
|
|
help="""The kernel manager class. This is configurable to allow
|
|
|
subclassing of the KernelManager for customized behavior.
|
|
|
"""
|
|
|
)
|
|
|
def _kernel_manager_class_changed(self, name, old, new):
|
|
|
self.kernel_manager_factory = import_item(new)
|
|
|
|
|
|
kernel_manager_factory = Any(help="this is kernel_manager_class after import")
|
|
|
def _kernel_manager_factory_default(self):
|
|
|
return import_item(self.kernel_manager_class)
|
|
|
|
|
|
context = Instance('zmq.Context')
|
|
|
def _context_default(self):
|
|
|
return zmq.Context.instance()
|
|
|
|
|
|
connection_dir = Unicode('')
|
|
|
|
|
|
_kernels = Dict()
|
|
|
|
|
|
def list_kernel_ids(self):
|
|
|
"""Return a list of the kernel ids of the active kernels."""
|
|
|
# Create a copy so we can iterate over kernels in operations
|
|
|
# that delete keys.
|
|
|
return list(self._kernels.keys())
|
|
|
|
|
|
def __len__(self):
|
|
|
"""Return the number of running kernels."""
|
|
|
return len(self.list_kernel_ids())
|
|
|
|
|
|
def __contains__(self, kernel_id):
|
|
|
return kernel_id in self._kernels
|
|
|
|
|
|
def start_kernel(self, **kwargs):
|
|
|
"""Start a new kernel.
|
|
|
|
|
|
The caller can pick a kernel_id by passing one in as a keyword arg,
|
|
|
otherwise one will be picked using a uuid.
|
|
|
|
|
|
To silence the kernel's stdout/stderr, call this using::
|
|
|
|
|
|
km.start_kernel(stdout=PIPE, stderr=PIPE)
|
|
|
|
|
|
"""
|
|
|
kernel_id = kwargs.pop('kernel_id', unicode(uuid.uuid4()))
|
|
|
if kernel_id in self:
|
|
|
raise DuplicateKernelError('Kernel already exists: %s' % kernel_id)
|
|
|
# kernel_manager_factory is the constructor for the KernelManager
|
|
|
# subclass we are using. It can be configured as any Configurable,
|
|
|
# including things like its transport and ip.
|
|
|
km = self.kernel_manager_factory(connection_file=os.path.join(
|
|
|
self.connection_dir, "kernel-%s.json" % kernel_id),
|
|
|
config=self.config, autorestart=True, log=self.log
|
|
|
)
|
|
|
km.start_kernel(**kwargs)
|
|
|
# start just the shell channel, needed for graceful restart
|
|
|
km.start_channels(shell=True, iopub=False, stdin=False, hb=False)
|
|
|
self._kernels[kernel_id] = km
|
|
|
return kernel_id
|
|
|
|
|
|
def shutdown_kernel(self, kernel_id, now=False):
|
|
|
"""Shutdown a kernel by its kernel uuid.
|
|
|
|
|
|
Parameters
|
|
|
==========
|
|
|
kernel_id : uuid
|
|
|
The id of the kernel to shutdown.
|
|
|
now : bool
|
|
|
Should the kernel be shutdown forcibly using a signal.
|
|
|
"""
|
|
|
k = self.get_kernel(kernel_id)
|
|
|
k.shutdown_kernel(now=now)
|
|
|
k.shell_channel.stop()
|
|
|
del self._kernels[kernel_id]
|
|
|
|
|
|
def shutdown_all(self, now=False):
|
|
|
"""Shutdown all kernels."""
|
|
|
for kid in self.list_kernel_ids():
|
|
|
self.shutdown_kernel(kid, now=now)
|
|
|
|
|
|
def interrupt_kernel(self, kernel_id):
|
|
|
"""Interrupt (SIGINT) the kernel by its uuid.
|
|
|
|
|
|
Parameters
|
|
|
==========
|
|
|
kernel_id : uuid
|
|
|
The id of the kernel to interrupt.
|
|
|
"""
|
|
|
return self.get_kernel(kernel_id).interrupt_kernel()
|
|
|
|
|
|
def signal_kernel(self, kernel_id, signum):
|
|
|
"""Sends a signal to the kernel by its uuid.
|
|
|
|
|
|
Note that since only SIGTERM is supported on Windows, this function
|
|
|
is only useful on Unix systems.
|
|
|
|
|
|
Parameters
|
|
|
==========
|
|
|
kernel_id : uuid
|
|
|
The id of the kernel to signal.
|
|
|
"""
|
|
|
return self.get_kernel(kernel_id).signal_kernel(signum)
|
|
|
|
|
|
def restart_kernel(self, kernel_id):
|
|
|
"""Restart a kernel by its uuid, keeping the same ports.
|
|
|
|
|
|
Parameters
|
|
|
==========
|
|
|
kernel_id : uuid
|
|
|
The id of the kernel to interrupt.
|
|
|
"""
|
|
|
km = self.get_kernel(kernel_id)
|
|
|
km.restart_kernel()
|
|
|
|
|
|
def is_alive(self, kernel_id):
|
|
|
"""Is the kernel alive.
|
|
|
|
|
|
This calls KernelManager.is_alive() which calls Popen.poll on the
|
|
|
actual kernel subprocess.
|
|
|
|
|
|
Parameters
|
|
|
==========
|
|
|
kernel_id : uuid
|
|
|
The id of the kernel.
|
|
|
"""
|
|
|
return self.get_kernel(kernel_id).is_alive()
|
|
|
|
|
|
def get_kernel(self, kernel_id):
|
|
|
"""Get the single KernelManager object for a kernel by its uuid.
|
|
|
|
|
|
Parameters
|
|
|
==========
|
|
|
kernel_id : uuid
|
|
|
The id of the kernel.
|
|
|
"""
|
|
|
km = self._kernels.get(kernel_id)
|
|
|
if km is not None:
|
|
|
return km
|
|
|
else:
|
|
|
raise KeyError("Kernel with id not found: %s" % kernel_id)
|
|
|
|
|
|
def get_connection_info(self, kernel_id):
|
|
|
"""Return a dictionary of connection data for a kernel.
|
|
|
|
|
|
Parameters
|
|
|
==========
|
|
|
kernel_id : uuid
|
|
|
The id of the kernel.
|
|
|
|
|
|
Returns
|
|
|
=======
|
|
|
connection_dict : dict
|
|
|
A dict of the information needed to connect to a kernel.
|
|
|
This includes the ip address and the integer port
|
|
|
numbers of the different channels (stdin_port, iopub_port,
|
|
|
shell_port, hb_port).
|
|
|
"""
|
|
|
km = self.get_kernel(kernel_id)
|
|
|
return dict(transport=km.transport,
|
|
|
ip=km.ip,
|
|
|
shell_port=km.shell_port,
|
|
|
iopub_port=km.iopub_port,
|
|
|
stdin_port=km.stdin_port,
|
|
|
hb_port=km.hb_port,
|
|
|
)
|
|
|
|
|
|
def _make_url(self, transport, ip, port):
|
|
|
"""Make a ZeroMQ URL for a given transport, ip and port."""
|
|
|
if transport == 'tcp':
|
|
|
return "tcp://%s:%i" % (ip, port)
|
|
|
else:
|
|
|
return "%s://%s-%s" % (transport, ip, port)
|
|
|
|
|
|
def _create_connected_stream(self, kernel_id, socket_type, channel):
|
|
|
"""Create a connected ZMQStream for a kernel."""
|
|
|
cinfo = self.get_connection_info(kernel_id)
|
|
|
url = self._make_url(cinfo['transport'], cinfo['ip'],
|
|
|
cinfo['%s_port' % channel]
|
|
|
)
|
|
|
sock = self.context.socket(socket_type)
|
|
|
self.log.info("Connecting to: %s" % url)
|
|
|
sock.connect(url)
|
|
|
return ZMQStream(sock)
|
|
|
|
|
|
def create_iopub_stream(self, kernel_id):
|
|
|
"""Return a ZMQStream object connected to the iopub channel.
|
|
|
|
|
|
Parameters
|
|
|
==========
|
|
|
kernel_id : uuid
|
|
|
The id of the kernel.
|
|
|
|
|
|
Returns
|
|
|
=======
|
|
|
stream : ZMQStream
|
|
|
"""
|
|
|
iopub_stream = self._create_connected_stream(kernel_id, zmq.SUB, 'iopub')
|
|
|
iopub_stream.socket.setsockopt(zmq.SUBSCRIBE, b'')
|
|
|
return iopub_stream
|
|
|
|
|
|
def create_shell_stream(self, kernel_id):
|
|
|
"""Return a ZMQStream object connected to the shell channel.
|
|
|
|
|
|
Parameters
|
|
|
==========
|
|
|
kernel_id : uuid
|
|
|
The id of the kernel.
|
|
|
|
|
|
Returns
|
|
|
=======
|
|
|
stream : ZMQStream
|
|
|
"""
|
|
|
shell_stream = self._create_connected_stream(kernel_id, zmq.DEALER, 'shell')
|
|
|
return shell_stream
|
|
|
|
|
|
def create_hb_stream(self, kernel_id):
|
|
|
"""Return a ZMQStream object connected to the hb channel.
|
|
|
|
|
|
Parameters
|
|
|
==========
|
|
|
kernel_id : uuid
|
|
|
The id of the kernel.
|
|
|
|
|
|
Returns
|
|
|
=======
|
|
|
stream : ZMQStream
|
|
|
"""
|
|
|
hb_stream = self._create_connected_stream(kernel_id, zmq.REQ, 'hb')
|
|
|
return hb_stream
|
|
|
|
|
|
|
