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"""A kernel manager for multiple kernels."""
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#-----------------------------------------------------------------------------
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# Copyright (C) 2011 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.txt, 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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import signal
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import sys
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import uuid
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import zmq
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from tornado import web
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from .routers import IOPubStreamRouter, ShellStreamRouter
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from IPython.config.configurable import LoggingConfigurable
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from IPython.zmq.ipkernel import launch_kernel
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from IPython.utils.traitlets import Instance, Dict, List, Unicode
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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 KernelManager(LoggingConfigurable):
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"""A class for managing multiple kernels."""
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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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_kernels = Dict()
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@property
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def kernel_ids(self):
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"""Return a list of the kernel ids of the active kernels."""
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return 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.kernel_ids)
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def __contains__(self, kernel_id):
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if kernel_id in self.kernel_ids:
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return True
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else:
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return False
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def start_kernel(self, **kwargs):
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"""Start a new kernel."""
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kernel_id = unicode(uuid.uuid4())
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(process, shell_port, iopub_port, stdin_port, hb_port) = launch_kernel(**kwargs)
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# Store the information for contacting the kernel. This assumes the kernel is
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# running on localhost.
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d = dict(
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process = process,
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stdin_port = stdin_port,
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iopub_port = iopub_port,
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shell_port = shell_port,
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hb_port = hb_port,
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ip = '127.0.0.1'
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)
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self._kernels[kernel_id] = d
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return kernel_id
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def kill_kernel(self, kernel_id):
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"""Kill 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 kill.
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"""
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kernel_process = self.get_kernel_process(kernel_id)
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if kernel_process is not None:
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# Attempt to kill the kernel.
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try:
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kernel_process.kill()
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except OSError, 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 not (sys.platform == 'win32' and e.winerror == 5):
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raise
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del self._kernels[kernel_id]
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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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kernel_process = self.get_kernel_process(kernel_id)
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if kernel_process is not None:
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if sys.platform == 'win32':
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from parentpoller import ParentPollerWindows as Poller
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Poller.send_interrupt(kernel_process.win32_interrupt_event)
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else:
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kernel_process.send_signal(signal.SIGINT)
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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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kernel_process = self.get_kernel_process(kernel_id)
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if kernel_process is not None:
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kernel_process.send_signal(signum)
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def get_kernel_process(self, kernel_id):
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"""Get the process 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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d = self._kernels.get(kernel_id)
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if d is not None:
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return d['process']
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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_kernel_ports(self, kernel_id):
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"""Return a dictionary of ports 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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port_dict : dict
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A dict of key, value pairs where the keys are the names
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(stdin_port,iopub_port,shell_port) and the values are the
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integer port numbers for those channels.
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"""
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d = self._kernels.get(kernel_id)
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if d is not None:
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dcopy = d.copy()
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dcopy.pop('process')
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dcopy.pop('ip')
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return dcopy
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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_kernel_ip(self, kernel_id):
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"""Return ip address 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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ip : str
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The ip address of the kernel.
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"""
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d = self._kernels.get(kernel_id)
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if d is not None:
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return d['ip']
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else:
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raise KeyError("Kernel with id not found: %s" % kernel_id)
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def create_session_manager(self, kernel_id):
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"""Create a new session manager for a kernel by its uuid."""
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from sessionmanager import SessionManager
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return SessionManager(
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kernel_id=kernel_id, kernel_manager=self,
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config=self.config, context=self.context, log=self.log
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)
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class RoutingKernelManager(LoggingConfigurable):
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"""A KernelManager that handles WebSocket routing and HTTP error handling"""
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kernel_argv = List(Unicode)
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kernel_manager = Instance(KernelManager)
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_routers = Dict()
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_session_dict = Dict()
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_notebook_mapping = Dict()
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#-------------------------------------------------------------------------
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# Methods for managing kernels and sessions
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#-------------------------------------------------------------------------
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@property
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def kernel_ids(self):
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"""List the kernel ids."""
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return self.kernel_manager.kernel_ids
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def kernel_for_notebook(self, notebook_id):
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"""Return the kernel_id for a notebook_id or None."""
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return self._notebook_mapping.get(notebook_id)
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def set_kernel_for_notebook(self, notebook_id, kernel_id):
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"""Associate a notebook with a kernel."""
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if notebook_id is not None:
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self._notebook_mapping[notebook_id] = kernel_id
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def notebook_for_kernel(self, kernel_id):
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"""Return the notebook_id for a kernel_id or None."""
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notebook_ids = [k for k, v in self._notebook_mapping.iteritems() if v == kernel_id]
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if len(notebook_ids) == 1:
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return notebook_ids[0]
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else:
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return None
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def delete_mapping_for_kernel(self, kernel_id):
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"""Remove the kernel/notebook mapping for kernel_id."""
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notebook_id = self.notebook_for_kernel(kernel_id)
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if notebook_id is not None:
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del self._notebook_mapping[notebook_id]
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def start_kernel(self, notebook_id=None):
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"""Start a kernel an return its kernel_id.
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Parameters
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----------
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notebook_id : uuid
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The uuid of the notebook to associate the new kernel with. If this
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is not None, this kernel will be persistent whenever the notebook
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requests a kernel.
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"""
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self.log.info
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kernel_id = self.kernel_for_notebook(notebook_id)
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if kernel_id is None:
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kwargs = dict()
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kwargs['extra_arguments'] = self.kernel_argv
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kernel_id = self.kernel_manager.start_kernel(**kwargs)
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self.set_kernel_for_notebook(notebook_id, kernel_id)
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self.log.info("Kernel started: %s" % kernel_id)
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self.log.debug("Kernel args: %r" % kwargs)
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self.start_session_manager(kernel_id)
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else:
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self.log.info("Using existing kernel: %s" % kernel_id)
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return kernel_id
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def start_session_manager(self, kernel_id):
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"""Start the ZMQ sockets (a "session") to connect to a kernel."""
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sm = self.kernel_manager.create_session_manager(kernel_id)
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self._session_dict[kernel_id] = sm
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iopub_stream = sm.get_iopub_stream()
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shell_stream = sm.get_shell_stream()
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iopub_router = IOPubStreamRouter(
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zmq_stream=iopub_stream, session=sm.session, config=self.config
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)
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shell_router = ShellStreamRouter(
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zmq_stream=shell_stream, session=sm.session, config=self.config
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)
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self.set_router(kernel_id, 'iopub', iopub_router)
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self.set_router(kernel_id, 'shell', shell_router)
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def kill_kernel(self, kernel_id):
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"""Kill a kernel and remove its notebook association."""
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if kernel_id not in self.kernel_manager:
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raise web.HTTPError(404)
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try:
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sm = self._session_dict.pop(kernel_id)
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except KeyError:
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raise web.HTTPError(404)
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sm.stop()
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self.kernel_manager.kill_kernel(kernel_id)
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self.delete_mapping_for_kernel(kernel_id)
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self.log.info("Kernel killed: %s" % kernel_id)
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def interrupt_kernel(self, kernel_id):
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"""Interrupt a kernel."""
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if kernel_id not in self.kernel_manager:
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raise web.HTTPError(404)
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self.kernel_manager.interrupt_kernel(kernel_id)
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self.log.debug("Kernel interrupted: %s" % kernel_id)
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def restart_kernel(self, kernel_id):
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"""Restart a kernel while keeping clients connected."""
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if kernel_id not in self.kernel_manager:
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raise web.HTTPError(404)
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# Get the notebook_id to preserve the kernel/notebook association
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notebook_id = self.notebook_for_kernel(kernel_id)
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# Create the new kernel first so we can move the clients over.
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new_kernel_id = self.start_kernel()
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# Copy the clients over to the new routers.
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old_iopub_router = self.get_router(kernel_id, 'iopub')
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old_shell_router = self.get_router(kernel_id, 'shell')
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new_iopub_router = self.get_router(new_kernel_id, 'iopub')
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new_shell_router = self.get_router(new_kernel_id, 'shell')
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new_iopub_router.copy_clients(old_iopub_router)
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new_shell_router.copy_clients(old_shell_router)
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# Shut down the old routers
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old_shell_router.close()
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old_iopub_router.close()
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self.delete_router(kernel_id, 'shell')
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self.delete_router(kernel_id, 'iopub')
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del old_shell_router
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del old_iopub_router
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# Now shutdown the old session and the kernel.
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# TODO: This causes a hard crash in ZMQStream.close, which sets
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# self.socket to None to hastily. We will need to fix this in PyZMQ
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# itself. For now, we just leave the old kernel running :(
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# Maybe this is fixed now, but nothing was changed really.
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self.kill_kernel(kernel_id)
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# Now save the new kernel/notebook association. We have to save it
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# after the old kernel is killed as that will delete the mapping.
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self.set_kernel_for_notebook(notebook_id, new_kernel_id)
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self.log.debug("Kernel restarted: %s" % new_kernel_id)
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return new_kernel_id
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def get_router(self, kernel_id, stream_name):
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"""Return the router for a given kernel_id and stream name."""
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router = self._routers[(kernel_id, stream_name)]
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return router
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def set_router(self, kernel_id, stream_name, router):
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"""Set the router for a given kernel_id and stream_name."""
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self._routers[(kernel_id, stream_name)] = router
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def delete_router(self, kernel_id, stream_name):
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"""Delete a router for a kernel_id and stream_name."""
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try:
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del self._routers[(kernel_id, stream_name)]
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except KeyError:
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pass
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