|
|
"""A kernel manager relating notebooks and 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
|
|
|
#-----------------------------------------------------------------------------
|
|
|
|
|
|
import os
|
|
|
|
|
|
from tornado import web
|
|
|
|
|
|
from IPython.kernel.multikernelmanager import MultiKernelManager
|
|
|
from IPython.utils.traitlets import (
|
|
|
Dict, List, Unicode,
|
|
|
)
|
|
|
|
|
|
from IPython.html.utils import to_os_path
|
|
|
from IPython.utils.py3compat import getcwd
|
|
|
|
|
|
#-----------------------------------------------------------------------------
|
|
|
# Classes
|
|
|
#-----------------------------------------------------------------------------
|
|
|
|
|
|
|
|
|
class MappingKernelManager(MultiKernelManager):
|
|
|
"""A KernelManager that handles notebook mapping and HTTP error handling"""
|
|
|
|
|
|
def _kernel_manager_class_default(self):
|
|
|
return "IPython.kernel.ioloop.IOLoopKernelManager"
|
|
|
|
|
|
kernel_argv = List(Unicode)
|
|
|
|
|
|
root_dir = Unicode(getcwd(), config=True)
|
|
|
|
|
|
def _root_dir_changed(self, name, old, new):
|
|
|
"""Do a bit of validation of the root dir."""
|
|
|
if not os.path.isabs(new):
|
|
|
# If we receive a non-absolute path, make it absolute.
|
|
|
self.root_dir = os.path.abspath(new)
|
|
|
return
|
|
|
if not os.path.exists(new) or not os.path.isdir(new):
|
|
|
raise TraitError("kernel root dir %r is not a directory" % new)
|
|
|
|
|
|
#-------------------------------------------------------------------------
|
|
|
# Methods for managing kernels and sessions
|
|
|
#-------------------------------------------------------------------------
|
|
|
|
|
|
def _handle_kernel_died(self, kernel_id):
|
|
|
"""notice that a kernel died"""
|
|
|
self.log.warn("Kernel %s died, removing from map.", kernel_id)
|
|
|
self.remove_kernel(kernel_id)
|
|
|
|
|
|
def cwd_for_path(self, path):
|
|
|
"""Turn API path into absolute OS path."""
|
|
|
os_path = to_os_path(path, self.root_dir)
|
|
|
# in the case of notebooks and kernels not being on the same filesystem,
|
|
|
# walk up to root_dir if the paths don't exist
|
|
|
while not os.path.exists(os_path) and os_path != self.root_dir:
|
|
|
os_path = os.path.dirname(os_path)
|
|
|
return os_path
|
|
|
|
|
|
def start_kernel(self, kernel_id=None, path=None, **kwargs):
|
|
|
"""Start a kernel for a session an return its kernel_id.
|
|
|
|
|
|
Parameters
|
|
|
----------
|
|
|
kernel_id : uuid
|
|
|
The uuid to associate the new kernel with. If this
|
|
|
is not None, this kernel will be persistent whenever it is
|
|
|
requested.
|
|
|
path : API path
|
|
|
The API path (unicode, '/' delimited) for the cwd.
|
|
|
Will be transformed to an OS path relative to root_dir.
|
|
|
"""
|
|
|
if kernel_id is None:
|
|
|
kwargs['extra_arguments'] = self.kernel_argv
|
|
|
if path is not None:
|
|
|
kwargs['cwd'] = self.cwd_for_path(path)
|
|
|
kernel_id = super(MappingKernelManager, self).start_kernel(**kwargs)
|
|
|
self.log.info("Kernel started: %s" % kernel_id)
|
|
|
self.log.debug("Kernel args: %r" % kwargs)
|
|
|
# register callback for failed auto-restart
|
|
|
self.add_restart_callback(kernel_id,
|
|
|
lambda : self._handle_kernel_died(kernel_id),
|
|
|
'dead',
|
|
|
)
|
|
|
else:
|
|
|
self._check_kernel_id(kernel_id)
|
|
|
self.log.info("Using existing kernel: %s" % kernel_id)
|
|
|
return kernel_id
|
|
|
|
|
|
def shutdown_kernel(self, kernel_id, now=False):
|
|
|
"""Shutdown a kernel by kernel_id"""
|
|
|
self._check_kernel_id(kernel_id)
|
|
|
super(MappingKernelManager, self).shutdown_kernel(kernel_id, now=now)
|
|
|
|
|
|
def kernel_model(self, kernel_id):
|
|
|
"""Return a dictionary of kernel information described in the
|
|
|
JSON standard model."""
|
|
|
self._check_kernel_id(kernel_id)
|
|
|
model = {"id":kernel_id}
|
|
|
return model
|
|
|
|
|
|
def list_kernels(self):
|
|
|
"""Returns a list of kernel_id's of kernels running."""
|
|
|
kernels = []
|
|
|
kernel_ids = super(MappingKernelManager, self).list_kernel_ids()
|
|
|
for kernel_id in kernel_ids:
|
|
|
model = self.kernel_model(kernel_id)
|
|
|
kernels.append(model)
|
|
|
return kernels
|
|
|
|
|
|
# override _check_kernel_id to raise 404 instead of KeyError
|
|
|
def _check_kernel_id(self, kernel_id):
|
|
|
"""Check a that a kernel_id exists and raise 404 if not."""
|
|
|
if kernel_id not in self:
|
|
|
raise web.HTTPError(404, u'Kernel does not exist: %s' % kernel_id)
|
|
|
|
