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"""Base classes to manage the interaction with a running kernel.
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Todo
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====
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* Create logger to handle debugging and console messages.
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"""
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#-----------------------------------------------------------------------------
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# Copyright (C) 2008-2010 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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# Standard library imports.
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from Queue import Queue, Empty
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from subprocess import Popen
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from threading import Thread
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import time
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# System library imports.
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import zmq
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from zmq import POLLIN, POLLOUT, POLLERR
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from zmq.eventloop import ioloop
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# Local imports.
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from IPython.utils import io
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from IPython.utils.traitlets import HasTraits, Any, Instance, Type, TCPAddress
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from session import Session
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#-----------------------------------------------------------------------------
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# Constants and exceptions
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#-----------------------------------------------------------------------------
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LOCALHOST = '127.0.0.1'
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class InvalidPortNumber(Exception):
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pass
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#-----------------------------------------------------------------------------
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# Utility functions
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#-----------------------------------------------------------------------------
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# some utilities to validate message structure, these might get moved elsewhere
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# if they prove to have more generic utility
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def validate_string_list(lst):
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"""Validate that the input is a list of strings.
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Raises ValueError if not."""
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if not isinstance(lst, list):
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raise ValueError('input %r must be a list' % lst)
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for x in lst:
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if not isinstance(x, basestring):
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raise ValueError('element %r in list must be a string' % x)
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def validate_string_dict(dct):
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"""Validate that the input is a dict with string keys and values.
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Raises ValueError if not."""
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for k,v in dct.iteritems():
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if not isinstance(k, basestring):
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raise ValueError('key %r in dict must be a string' % k)
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if not isinstance(v, basestring):
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raise ValueError('value %r in dict must be a string' % v)
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#-----------------------------------------------------------------------------
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# ZMQ Socket Channel classes
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#-----------------------------------------------------------------------------
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class ZmqSocketChannel(Thread):
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"""The base class for the channels that use ZMQ sockets.
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"""
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context = None
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session = None
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socket = None
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ioloop = None
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iostate = None
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_address = None
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def __init__(self, context, session, address):
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"""Create a channel
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Parameters
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----------
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|
context : :class:`zmq.Context`
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The ZMQ context to use.
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session : :class:`session.Session`
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The session to use.
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address : tuple
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|
Standard (ip, port) tuple that the kernel is listening on.
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|
|
"""
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|
|
super(ZmqSocketChannel, self).__init__()
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self.daemon = True
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self.context = context
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self.session = session
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|
|
if address[1] == 0:
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|
message = 'The port number for a channel cannot be 0.'
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|
raise InvalidPortNumber(message)
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self._address = address
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def stop(self):
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"""Stop the channel's activity.
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|
This calls :method:`Thread.join` and returns when the thread
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|
terminates. :class:`RuntimeError` will be raised if
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|
:method:`self.start` is called again.
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|
"""
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self.join()
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|
@property
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def address(self):
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|
"""Get the channel's address as an (ip, port) tuple.
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By the default, the address is (localhost, 0), where 0 means a random
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|
port.
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"""
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return self._address
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def add_io_state(self, state):
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|
"""Add IO state to the eventloop.
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|
|
Parameters
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|
|
----------
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|
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state : zmq.POLLIN|zmq.POLLOUT|zmq.POLLERR
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|
The IO state flag to set.
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|
This is thread safe as it uses the thread safe IOLoop.add_callback.
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|
|
"""
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def add_io_state_callback():
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|
|
if not self.iostate & state:
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|
self.iostate = self.iostate | state
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|
|
self.ioloop.update_handler(self.socket, self.iostate)
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|
self.ioloop.add_callback(add_io_state_callback)
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|
def drop_io_state(self, state):
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|
"""Drop IO state from the eventloop.
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|
|
|
Parameters
|
|
|
----------
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|
|
state : zmq.POLLIN|zmq.POLLOUT|zmq.POLLERR
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|
|
The IO state flag to set.
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|
|
This is thread safe as it uses the thread safe IOLoop.add_callback.
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|
|
"""
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|
|
def drop_io_state_callback():
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|
|
if self.iostate & state:
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|
self.iostate = self.iostate & (~state)
|
|
|
self.ioloop.update_handler(self.socket, self.iostate)
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|
|
self.ioloop.add_callback(drop_io_state_callback)
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|
|
class XReqSocketChannel(ZmqSocketChannel):
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|
|
"""The XREQ channel for issues request/replies to the kernel.
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|
|
"""
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|
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|
|
command_queue = None
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|
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|
|
|
def __init__(self, context, session, address):
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|
|
self.command_queue = Queue()
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|
|
super(XReqSocketChannel, self).__init__(context, session, address)
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|
|
|
|
def run(self):
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|
|
"""The thread's main activity. Call start() instead."""
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|
|
self.socket = self.context.socket(zmq.XREQ)
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|
|
self.socket.setsockopt(zmq.IDENTITY, self.session.session)
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|
|
self.socket.connect('tcp://%s:%i' % self.address)
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|
|
self.ioloop = ioloop.IOLoop()
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|
|
self.iostate = POLLERR|POLLIN
|
|
|
self.ioloop.add_handler(self.socket, self._handle_events,
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|
|
self.iostate)
|
|
|
self.ioloop.start()
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|
|
|
|
|
def stop(self):
|
|
|
self.ioloop.stop()
|
|
|
super(XReqSocketChannel, self).stop()
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|
|
|
|
|
def call_handlers(self, msg):
|
|
|
"""This method is called in the ioloop thread when a message arrives.
|
|
|
|
|
|
Subclasses should override this method to handle incoming messages.
|
|
|
It is important to remember that this method is called in the thread
|
|
|
so that some logic must be done to ensure that the application leve
|
|
|
handlers are called in the application thread.
|
|
|
"""
|
|
|
raise NotImplementedError('call_handlers must be defined in a subclass.')
|
|
|
|
|
|
def execute(self, code, silent=False,
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|
|
user_variables=None, user_expressions=None):
|
|
|
"""Execute code in the kernel.
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|
|
|
|
|
Parameters
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|
|
----------
|
|
|
code : str
|
|
|
A string of Python code.
|
|
|
|
|
|
silent : bool, optional (default False)
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|
|
If set, the kernel will execute the code as quietly possible.
|
|
|
|
|
|
user_variables : list, optional
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|
|
|
|
|
A list of variable names to pull from the user's namespace. They
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|
|
will come back as a dict with these names as keys and their
|
|
|
:func:`repr` as values.
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|
|
|
|
|
user_expressions : dict, optional
|
|
|
A dict with string keys and to pull from the user's
|
|
|
namespace. They will come back as a dict with these names as keys
|
|
|
and their :func:`repr` as values.
|
|
|
|
|
|
Returns
|
|
|
-------
|
|
|
The msg_id of the message sent.
|
|
|
"""
|
|
|
if user_variables is None:
|
|
|
user_variables = []
|
|
|
if user_expressions is None:
|
|
|
user_expressions = {}
|
|
|
|
|
|
# Don't waste network traffic if inputs are invalid
|
|
|
if not isinstance(code, basestring):
|
|
|
raise ValueError('code %r must be a string' % code)
|
|
|
validate_string_list(user_variables)
|
|
|
validate_string_dict(user_expressions)
|
|
|
|
|
|
# Create class for content/msg creation. Related to, but possibly
|
|
|
# not in Session.
|
|
|
content = dict(code=code, silent=silent,
|
|
|
user_variables=user_variables,
|
|
|
user_expressions=user_expressions)
|
|
|
msg = self.session.msg('execute_request', content)
|
|
|
self._queue_request(msg)
|
|
|
return msg['header']['msg_id']
|
|
|
|
|
|
def complete(self, text, line, cursor_pos, block=None):
|
|
|
"""Tab complete text in the kernel's namespace.
|
|
|
|
|
|
Parameters
|
|
|
----------
|
|
|
text : str
|
|
|
The text to complete.
|
|
|
line : str
|
|
|
The full line of text that is the surrounding context for the
|
|
|
text to complete.
|
|
|
cursor_pos : int
|
|
|
The position of the cursor in the line where the completion was
|
|
|
requested.
|
|
|
block : str, optional
|
|
|
The full block of code in which the completion is being requested.
|
|
|
|
|
|
Returns
|
|
|
-------
|
|
|
The msg_id of the message sent.
|
|
|
"""
|
|
|
content = dict(text=text, line=line, block=block, cursor_pos=cursor_pos)
|
|
|
msg = self.session.msg('complete_request', content)
|
|
|
self._queue_request(msg)
|
|
|
return msg['header']['msg_id']
|
|
|
|
|
|
def object_info(self, oname):
|
|
|
"""Get metadata information about an object.
|
|
|
|
|
|
Parameters
|
|
|
----------
|
|
|
oname : str
|
|
|
A string specifying the object name.
|
|
|
|
|
|
Returns
|
|
|
-------
|
|
|
The msg_id of the message sent.
|
|
|
"""
|
|
|
content = dict(oname=oname)
|
|
|
msg = self.session.msg('object_info_request', content)
|
|
|
self._queue_request(msg)
|
|
|
return msg['header']['msg_id']
|
|
|
|
|
|
def history(self, index=None, raw=False, output=True):
|
|
|
"""Get the history list.
|
|
|
|
|
|
Parameters
|
|
|
----------
|
|
|
index : n or (n1, n2) or None
|
|
|
If n, then the last entries. If a tuple, then all in
|
|
|
range(n1, n2). If None, then all entries. Raises IndexError if
|
|
|
the format of index is incorrect.
|
|
|
raw : bool
|
|
|
If True, return the raw input.
|
|
|
output : bool
|
|
|
If True, then return the output as well.
|
|
|
|
|
|
Returns
|
|
|
-------
|
|
|
The msg_id of the message sent.
|
|
|
"""
|
|
|
content = dict(index=index, raw=raw, output=output)
|
|
|
msg = self.session.msg('history_request', content)
|
|
|
self._queue_request(msg)
|
|
|
return msg['header']['msg_id']
|
|
|
|
|
|
def _handle_events(self, socket, events):
|
|
|
if events & POLLERR:
|
|
|
self._handle_err()
|
|
|
if events & POLLOUT:
|
|
|
self._handle_send()
|
|
|
if events & POLLIN:
|
|
|
self._handle_recv()
|
|
|
|
|
|
def _handle_recv(self):
|
|
|
msg = self.socket.recv_json()
|
|
|
self.call_handlers(msg)
|
|
|
|
|
|
def _handle_send(self):
|
|
|
try:
|
|
|
msg = self.command_queue.get(False)
|
|
|
except Empty:
|
|
|
pass
|
|
|
else:
|
|
|
self.socket.send_json(msg)
|
|
|
if self.command_queue.empty():
|
|
|
self.drop_io_state(POLLOUT)
|
|
|
|
|
|
def _handle_err(self):
|
|
|
# We don't want to let this go silently, so eventually we should log.
|
|
|
raise zmq.ZMQError()
|
|
|
|
|
|
def _queue_request(self, msg):
|
|
|
self.command_queue.put(msg)
|
|
|
self.add_io_state(POLLOUT)
|
|
|
|
|
|
|
|
|
class SubSocketChannel(ZmqSocketChannel):
|
|
|
"""The SUB channel which listens for messages that the kernel publishes.
|
|
|
"""
|
|
|
|
|
|
def __init__(self, context, session, address):
|
|
|
super(SubSocketChannel, self).__init__(context, session, address)
|
|
|
|
|
|
def run(self):
|
|
|
"""The thread's main activity. Call start() instead."""
|
|
|
self.socket = self.context.socket(zmq.SUB)
|
|
|
self.socket.setsockopt(zmq.SUBSCRIBE,'')
|
|
|
self.socket.setsockopt(zmq.IDENTITY, self.session.session)
|
|
|
self.socket.connect('tcp://%s:%i' % self.address)
|
|
|
self.ioloop = ioloop.IOLoop()
|
|
|
self.iostate = POLLIN|POLLERR
|
|
|
self.ioloop.add_handler(self.socket, self._handle_events,
|
|
|
self.iostate)
|
|
|
self.ioloop.start()
|
|
|
|
|
|
def stop(self):
|
|
|
self.ioloop.stop()
|
|
|
super(SubSocketChannel, self).stop()
|
|
|
|
|
|
def call_handlers(self, msg):
|
|
|
"""This method is called in the ioloop thread when a message arrives.
|
|
|
|
|
|
Subclasses should override this method to handle incoming messages.
|
|
|
It is important to remember that this method is called in the thread
|
|
|
so that some logic must be done to ensure that the application leve
|
|
|
handlers are called in the application thread.
|
|
|
"""
|
|
|
raise NotImplementedError('call_handlers must be defined in a subclass.')
|
|
|
|
|
|
def flush(self, timeout=1.0):
|
|
|
"""Immediately processes all pending messages on the SUB channel.
|
|
|
|
|
|
Callers should use this method to ensure that :method:`call_handlers`
|
|
|
has been called for all messages that have been received on the
|
|
|
0MQ SUB socket of this channel.
|
|
|
|
|
|
This method is thread safe.
|
|
|
|
|
|
Parameters
|
|
|
----------
|
|
|
timeout : float, optional
|
|
|
The maximum amount of time to spend flushing, in seconds. The
|
|
|
default is one second.
|
|
|
"""
|
|
|
# We do the IOLoop callback process twice to ensure that the IOLoop
|
|
|
# gets to perform at least one full poll.
|
|
|
stop_time = time.time() + timeout
|
|
|
for i in xrange(2):
|
|
|
self._flushed = False
|
|
|
self.ioloop.add_callback(self._flush)
|
|
|
while not self._flushed and time.time() < stop_time:
|
|
|
time.sleep(0.01)
|
|
|
|
|
|
def _handle_events(self, socket, events):
|
|
|
# Turn on and off POLLOUT depending on if we have made a request
|
|
|
if events & POLLERR:
|
|
|
self._handle_err()
|
|
|
if events & POLLIN:
|
|
|
self._handle_recv()
|
|
|
|
|
|
def _handle_err(self):
|
|
|
# We don't want to let this go silently, so eventually we should log.
|
|
|
raise zmq.ZMQError()
|
|
|
|
|
|
def _handle_recv(self):
|
|
|
# Get all of the messages we can
|
|
|
while True:
|
|
|
try:
|
|
|
msg = self.socket.recv_json(zmq.NOBLOCK)
|
|
|
except zmq.ZMQError:
|
|
|
# Check the errno?
|
|
|
# Will this trigger POLLERR?
|
|
|
break
|
|
|
else:
|
|
|
self.call_handlers(msg)
|
|
|
|
|
|
def _flush(self):
|
|
|
"""Callback for :method:`self.flush`."""
|
|
|
self._flushed = True
|
|
|
|
|
|
|
|
|
class RepSocketChannel(ZmqSocketChannel):
|
|
|
"""A reply channel to handle raw_input requests that the kernel makes."""
|
|
|
|
|
|
msg_queue = None
|
|
|
|
|
|
def __init__(self, context, session, address):
|
|
|
self.msg_queue = Queue()
|
|
|
super(RepSocketChannel, self).__init__(context, session, address)
|
|
|
|
|
|
def run(self):
|
|
|
"""The thread's main activity. Call start() instead."""
|
|
|
self.socket = self.context.socket(zmq.XREQ)
|
|
|
self.socket.setsockopt(zmq.IDENTITY, self.session.session)
|
|
|
self.socket.connect('tcp://%s:%i' % self.address)
|
|
|
self.ioloop = ioloop.IOLoop()
|
|
|
self.iostate = POLLERR|POLLIN
|
|
|
self.ioloop.add_handler(self.socket, self._handle_events,
|
|
|
self.iostate)
|
|
|
self.ioloop.start()
|
|
|
|
|
|
def stop(self):
|
|
|
self.ioloop.stop()
|
|
|
super(RepSocketChannel, self).stop()
|
|
|
|
|
|
def call_handlers(self, msg):
|
|
|
"""This method is called in the ioloop thread when a message arrives.
|
|
|
|
|
|
Subclasses should override this method to handle incoming messages.
|
|
|
It is important to remember that this method is called in the thread
|
|
|
so that some logic must be done to ensure that the application leve
|
|
|
handlers are called in the application thread.
|
|
|
"""
|
|
|
raise NotImplementedError('call_handlers must be defined in a subclass.')
|
|
|
|
|
|
def input(self, string):
|
|
|
"""Send a string of raw input to the kernel."""
|
|
|
content = dict(value=string)
|
|
|
msg = self.session.msg('input_reply', content)
|
|
|
self._queue_reply(msg)
|
|
|
|
|
|
def _handle_events(self, socket, events):
|
|
|
if events & POLLERR:
|
|
|
self._handle_err()
|
|
|
if events & POLLOUT:
|
|
|
self._handle_send()
|
|
|
if events & POLLIN:
|
|
|
self._handle_recv()
|
|
|
|
|
|
def _handle_recv(self):
|
|
|
msg = self.socket.recv_json()
|
|
|
self.call_handlers(msg)
|
|
|
|
|
|
def _handle_send(self):
|
|
|
try:
|
|
|
msg = self.msg_queue.get(False)
|
|
|
except Empty:
|
|
|
pass
|
|
|
else:
|
|
|
self.socket.send_json(msg)
|
|
|
if self.msg_queue.empty():
|
|
|
self.drop_io_state(POLLOUT)
|
|
|
|
|
|
def _handle_err(self):
|
|
|
# We don't want to let this go silently, so eventually we should log.
|
|
|
raise zmq.ZMQError()
|
|
|
|
|
|
def _queue_reply(self, msg):
|
|
|
self.msg_queue.put(msg)
|
|
|
self.add_io_state(POLLOUT)
|
|
|
|
|
|
|
|
|
class HBSocketChannel(ZmqSocketChannel):
|
|
|
"""The heartbeat channel which monitors the kernel heartbeat."""
|
|
|
|
|
|
time_to_dead = 3.0
|
|
|
socket = None
|
|
|
poller = None
|
|
|
|
|
|
def __init__(self, context, session, address):
|
|
|
super(HBSocketChannel, self).__init__(context, session, address)
|
|
|
self._running = False
|
|
|
|
|
|
def _create_socket(self):
|
|
|
self.socket = self.context.socket(zmq.REQ)
|
|
|
self.socket.setsockopt(zmq.IDENTITY, self.session.session)
|
|
|
self.socket.connect('tcp://%s:%i' % self.address)
|
|
|
self.poller = zmq.Poller()
|
|
|
self.poller.register(self.socket, zmq.POLLIN)
|
|
|
|
|
|
def run(self):
|
|
|
"""The thread's main activity. Call start() instead."""
|
|
|
self._create_socket()
|
|
|
self._running = True
|
|
|
# Wait 2 seconds for the kernel to come up and the sockets to auto
|
|
|
# connect. If we don't we will see the kernel as dead. Also, before
|
|
|
# the sockets are connected, the poller.poll line below is returning
|
|
|
# too fast. This avoids that because the polling doesn't start until
|
|
|
# after the sockets are connected.
|
|
|
time.sleep(2.0)
|
|
|
while self._running:
|
|
|
since_last_heartbeat = 0.0
|
|
|
request_time = time.time()
|
|
|
try:
|
|
|
#io.rprint('Ping from HB channel') # dbg
|
|
|
self.socket.send_json('ping')
|
|
|
except zmq.ZMQError, e:
|
|
|
#io.rprint('*** HB Error:', e) # dbg
|
|
|
if e.errno == zmq.EFSM:
|
|
|
#io.rprint('sleep...', self.time_to_dead) # dbg
|
|
|
time.sleep(self.time_to_dead)
|
|
|
self._create_socket()
|
|
|
else:
|
|
|
raise
|
|
|
else:
|
|
|
while True:
|
|
|
try:
|
|
|
self.socket.recv_json(zmq.NOBLOCK)
|
|
|
except zmq.ZMQError, e:
|
|
|
#io.rprint('*** HB Error 2:', e) # dbg
|
|
|
if e.errno == zmq.EAGAIN:
|
|
|
before_poll = time.time()
|
|
|
until_dead = self.time_to_dead - (before_poll -
|
|
|
request_time)
|
|
|
|
|
|
# When the return value of poll() is an empty list,
|
|
|
# that is when things have gone wrong (zeromq bug).
|
|
|
# As long as it is not an empty list, poll is
|
|
|
# working correctly even if it returns quickly.
|
|
|
# Note: poll timeout is in milliseconds.
|
|
|
self.poller.poll(1000*until_dead)
|
|
|
|
|
|
since_last_heartbeat = time.time() - request_time
|
|
|
if since_last_heartbeat > self.time_to_dead:
|
|
|
self.call_handlers(since_last_heartbeat)
|
|
|
break
|
|
|
else:
|
|
|
# FIXME: We should probably log this instead.
|
|
|
raise
|
|
|
else:
|
|
|
until_dead = self.time_to_dead - (time.time() -
|
|
|
request_time)
|
|
|
if until_dead > 0.0:
|
|
|
#io.rprint('sleep...', self.time_to_dead) # dbg
|
|
|
time.sleep(until_dead)
|
|
|
break
|
|
|
|
|
|
def stop(self):
|
|
|
self._running = False
|
|
|
super(HBSocketChannel, self).stop()
|
|
|
|
|
|
def call_handlers(self, since_last_heartbeat):
|
|
|
"""This method is called in the ioloop thread when a message arrives.
|
|
|
|
|
|
Subclasses should override this method to handle incoming messages.
|
|
|
It is important to remember that this method is called in the thread
|
|
|
so that some logic must be done to ensure that the application leve
|
|
|
handlers are called in the application thread.
|
|
|
"""
|
|
|
raise NotImplementedError('call_handlers must be defined in a subclass.')
|
|
|
|
|
|
|
|
|
#-----------------------------------------------------------------------------
|
|
|
# Main kernel manager class
|
|
|
#-----------------------------------------------------------------------------
|
|
|
|
|
|
class KernelManager(HasTraits):
|
|
|
""" Manages a kernel for a frontend.
|
|
|
|
|
|
The SUB channel is for the frontend to receive messages published by the
|
|
|
kernel.
|
|
|
|
|
|
The REQ channel is for the frontend to make requests of the kernel.
|
|
|
|
|
|
The REP channel is for the kernel to request stdin (raw_input) from the
|
|
|
frontend.
|
|
|
"""
|
|
|
# The PyZMQ Context to use for communication with the kernel.
|
|
|
context = Instance(zmq.Context,(),{})
|
|
|
|
|
|
# The Session to use for communication with the kernel.
|
|
|
session = Instance(Session,(),{})
|
|
|
|
|
|
# The kernel process with which the KernelManager is communicating.
|
|
|
kernel = Instance(Popen)
|
|
|
|
|
|
# The addresses for the communication channels.
|
|
|
xreq_address = TCPAddress((LOCALHOST, 0))
|
|
|
sub_address = TCPAddress((LOCALHOST, 0))
|
|
|
rep_address = TCPAddress((LOCALHOST, 0))
|
|
|
hb_address = TCPAddress((LOCALHOST, 0))
|
|
|
|
|
|
# The classes to use for the various channels.
|
|
|
xreq_channel_class = Type(XReqSocketChannel)
|
|
|
sub_channel_class = Type(SubSocketChannel)
|
|
|
rep_channel_class = Type(RepSocketChannel)
|
|
|
hb_channel_class = Type(HBSocketChannel)
|
|
|
|
|
|
# Protected traits.
|
|
|
_launch_args = Any
|
|
|
_xreq_channel = Any
|
|
|
_sub_channel = Any
|
|
|
_rep_channel = Any
|
|
|
_hb_channel = Any
|
|
|
|
|
|
#--------------------------------------------------------------------------
|
|
|
# Channel management methods:
|
|
|
#--------------------------------------------------------------------------
|
|
|
|
|
|
def start_channels(self):
|
|
|
"""Starts the channels for this kernel.
|
|
|
|
|
|
This will create the channels if they do not exist and then start
|
|
|
them. If port numbers of 0 are being used (random ports) then you
|
|
|
must first call :method:`start_kernel`. If the channels have been
|
|
|
stopped and you call this, :class:`RuntimeError` will be raised.
|
|
|
"""
|
|
|
self.xreq_channel.start()
|
|
|
self.sub_channel.start()
|
|
|
self.rep_channel.start()
|
|
|
self.hb_channel.start()
|
|
|
|
|
|
def stop_channels(self):
|
|
|
"""Stops the channels for this kernel.
|
|
|
|
|
|
This stops the channels by joining their threads. If the channels
|
|
|
were not started, :class:`RuntimeError` will be raised.
|
|
|
"""
|
|
|
self.xreq_channel.stop()
|
|
|
self.sub_channel.stop()
|
|
|
self.rep_channel.stop()
|
|
|
self.hb_channel.stop()
|
|
|
|
|
|
@property
|
|
|
def channels_running(self):
|
|
|
"""Are all of the channels created and running?"""
|
|
|
return self.xreq_channel.is_alive() \
|
|
|
and self.sub_channel.is_alive() \
|
|
|
and self.rep_channel.is_alive() \
|
|
|
and self.hb_channel.is_alive()
|
|
|
|
|
|
#--------------------------------------------------------------------------
|
|
|
# Kernel process management methods:
|
|
|
#--------------------------------------------------------------------------
|
|
|
|
|
|
def start_kernel(self, **kw):
|
|
|
"""Starts a kernel process and configures the manager to use it.
|
|
|
|
|
|
If random ports (port=0) are being used, this method must be called
|
|
|
before the channels are created.
|
|
|
|
|
|
Parameters:
|
|
|
-----------
|
|
|
ipython : bool, optional (default True)
|
|
|
Whether to use an IPython kernel instead of a plain Python kernel.
|
|
|
"""
|
|
|
xreq, sub, rep, hb = self.xreq_address, self.sub_address, \
|
|
|
self.rep_address, self.hb_address
|
|
|
if xreq[0] != LOCALHOST or sub[0] != LOCALHOST or \
|
|
|
rep[0] != LOCALHOST or hb[0] != LOCALHOST:
|
|
|
raise RuntimeError("Can only launch a kernel on localhost."
|
|
|
"Make sure that the '*_address' attributes are "
|
|
|
"configured properly.")
|
|
|
|
|
|
self._launch_args = kw.copy()
|
|
|
if kw.pop('ipython', True):
|
|
|
from ipkernel import launch_kernel as launch
|
|
|
else:
|
|
|
from pykernel import launch_kernel as launch
|
|
|
self.kernel, xrep, pub, req, hb = launch(
|
|
|
xrep_port=xreq[1], pub_port=sub[1],
|
|
|
req_port=rep[1], hb_port=hb[1], **kw)
|
|
|
self.xreq_address = (LOCALHOST, xrep)
|
|
|
self.sub_address = (LOCALHOST, pub)
|
|
|
self.rep_address = (LOCALHOST, req)
|
|
|
self.hb_address = (LOCALHOST, hb)
|
|
|
|
|
|
def restart_kernel(self):
|
|
|
"""Restarts a kernel with the same arguments that were used to launch
|
|
|
it. If the old kernel was launched with random ports, the same ports
|
|
|
will be used for the new kernel.
|
|
|
"""
|
|
|
if self._launch_args is None:
|
|
|
raise RuntimeError("Cannot restart the kernel. "
|
|
|
"No previous call to 'start_kernel'.")
|
|
|
else:
|
|
|
if self.has_kernel:
|
|
|
self.kill_kernel()
|
|
|
self.start_kernel(**self._launch_args)
|
|
|
|
|
|
@property
|
|
|
def has_kernel(self):
|
|
|
"""Returns whether a kernel process has been specified for the kernel
|
|
|
manager.
|
|
|
"""
|
|
|
return self.kernel is not None
|
|
|
|
|
|
def kill_kernel(self):
|
|
|
""" Kill the running kernel. """
|
|
|
if self.kernel is not None:
|
|
|
self.kernel.kill()
|
|
|
self.kernel = None
|
|
|
else:
|
|
|
raise RuntimeError("Cannot kill kernel. No kernel is running!")
|
|
|
|
|
|
def signal_kernel(self, signum):
|
|
|
""" Sends a signal to the kernel. """
|
|
|
if self.kernel is not None:
|
|
|
self.kernel.send_signal(signum)
|
|
|
else:
|
|
|
raise RuntimeError("Cannot signal kernel. No kernel is running!")
|
|
|
|
|
|
@property
|
|
|
def is_alive(self):
|
|
|
"""Is the kernel process still running?"""
|
|
|
if self.kernel is not None:
|
|
|
if self.kernel.poll() is None:
|
|
|
return True
|
|
|
else:
|
|
|
return False
|
|
|
else:
|
|
|
# We didn't start the kernel with this KernelManager so we don't
|
|
|
# know if it is running. We should use a heartbeat for this case.
|
|
|
return True
|
|
|
|
|
|
#--------------------------------------------------------------------------
|
|
|
# Channels used for communication with the kernel:
|
|
|
#--------------------------------------------------------------------------
|
|
|
|
|
|
@property
|
|
|
def xreq_channel(self):
|
|
|
"""Get the REQ socket channel object to make requests of the kernel."""
|
|
|
if self._xreq_channel is None:
|
|
|
self._xreq_channel = self.xreq_channel_class(self.context,
|
|
|
self.session,
|
|
|
self.xreq_address)
|
|
|
return self._xreq_channel
|
|
|
|
|
|
@property
|
|
|
def sub_channel(self):
|
|
|
"""Get the SUB socket channel object."""
|
|
|
if self._sub_channel is None:
|
|
|
self._sub_channel = self.sub_channel_class(self.context,
|
|
|
self.session,
|
|
|
self.sub_address)
|
|
|
return self._sub_channel
|
|
|
|
|
|
@property
|
|
|
def rep_channel(self):
|
|
|
"""Get the REP socket channel object to handle stdin (raw_input)."""
|
|
|
if self._rep_channel is None:
|
|
|
self._rep_channel = self.rep_channel_class(self.context,
|
|
|
self.session,
|
|
|
self.rep_address)
|
|
|
return self._rep_channel
|
|
|
|
|
|
@property
|
|
|
def hb_channel(self):
|
|
|
"""Get the REP socket channel object to handle stdin (raw_input)."""
|
|
|
if self._hb_channel is None:
|
|
|
self._hb_channel = self.hb_channel_class(self.context,
|
|
|
self.session,
|
|
|
self.hb_address)
|
|
|
return self._hb_channel
|
|
|
|
