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#!/usr/bin/env python
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"""An Application for launching a kernel
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Authors
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-------
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* MinRK
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"""
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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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# Standard library imports.
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import os
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import sys
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# System library imports.
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import zmq
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# IPython imports.
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from IPython.core.ultratb import FormattedTB
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from IPython.core.application import (
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BaseIPythonApplication, base_flags, base_aliases
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)
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from IPython.utils import io
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from IPython.utils.localinterfaces import LOCALHOST
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from IPython.utils.traitlets import (Any, Instance, Dict, Unicode, Int, Bool,
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DottedObjectName)
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from IPython.utils.importstring import import_item
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# local imports
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from IPython.zmq.heartbeat import Heartbeat
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from IPython.zmq.parentpoller import ParentPollerUnix, ParentPollerWindows
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from IPython.zmq.session import Session
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#-----------------------------------------------------------------------------
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# Flags and Aliases
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#-----------------------------------------------------------------------------
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kernel_aliases = dict(base_aliases)
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kernel_aliases.update({
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'ip' : 'KernelApp.ip',
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'hb' : 'KernelApp.hb_port',
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'shell' : 'KernelApp.shell_port',
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'iopub' : 'KernelApp.iopub_port',
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'stdin' : 'KernelApp.stdin_port',
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'parent': 'KernelApp.parent',
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})
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if sys.platform.startswith('win'):
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kernel_aliases['interrupt'] = 'KernelApp.interrupt'
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kernel_flags = dict(base_flags)
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kernel_flags.update({
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'no-stdout' : (
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{'KernelApp' : {'no_stdout' : True}},
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"redirect stdout to the null device"),
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'no-stderr' : (
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{'KernelApp' : {'no_stderr' : True}},
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"redirect stderr to the null device"),
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})
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#-----------------------------------------------------------------------------
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# Application class for starting a Kernel
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#-----------------------------------------------------------------------------
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class KernelApp(BaseIPythonApplication):
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name='pykernel'
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aliases = Dict(kernel_aliases)
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flags = Dict(kernel_flags)
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classes = [Session]
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# the kernel class, as an importstring
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kernel_class = DottedObjectName('IPython.zmq.pykernel.Kernel')
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kernel = Any()
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poller = Any() # don't restrict this even though current pollers are all Threads
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heartbeat = Instance(Heartbeat)
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session = Instance('IPython.zmq.session.Session')
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ports = Dict()
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# inherit config file name from parent:
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parent_appname = Unicode(config=True)
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def _parent_appname_changed(self, name, old, new):
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if self.config_file_specified:
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# it was manually specified, ignore
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return
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self.config_file_name = new.replace('-','_') + u'_config.py'
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# don't let this count as specifying the config file
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self.config_file_specified = False
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# connection info:
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ip = Unicode(LOCALHOST, config=True,
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help="Set the IP or interface on which the kernel will listen.")
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hb_port = Int(0, config=True, help="set the heartbeat port [default: random]")
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shell_port = Int(0, config=True, help="set the shell (XREP) port [default: random]")
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iopub_port = Int(0, config=True, help="set the iopub (PUB) port [default: random]")
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stdin_port = Int(0, config=True, help="set the stdin (XREQ) port [default: random]")
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# streams, etc.
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no_stdout = Bool(False, config=True, help="redirect stdout to the null device")
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no_stderr = Bool(False, config=True, help="redirect stderr to the null device")
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outstream_class = DottedObjectName('IPython.zmq.iostream.OutStream',
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config=True, help="The importstring for the OutStream factory")
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displayhook_class = DottedObjectName('IPython.zmq.displayhook.ZMQDisplayHook',
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config=True, help="The importstring for the DisplayHook factory")
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# polling
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parent = Int(0, config=True,
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help="""kill this process if its parent dies. On Windows, the argument
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specifies the HANDLE of the parent process, otherwise it is simply boolean.
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""")
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interrupt = Int(0, config=True,
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help="""ONLY USED ON WINDOWS
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Interrupt this process when the parent is signalled.
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""")
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def init_crash_handler(self):
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# Install minimal exception handling
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sys.excepthook = FormattedTB(mode='Verbose', color_scheme='NoColor',
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ostream=sys.__stdout__)
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def init_poller(self):
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if sys.platform == 'win32':
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if self.interrupt or self.parent:
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self.poller = ParentPollerWindows(self.interrupt, self.parent)
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elif self.parent:
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self.poller = ParentPollerUnix()
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def _bind_socket(self, s, port):
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iface = 'tcp://%s' % self.ip
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if port <= 0:
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port = s.bind_to_random_port(iface)
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else:
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s.bind(iface + ':%i'%port)
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return port
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def init_sockets(self):
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# Create a context, a session, and the kernel sockets.
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self.log.info("Starting the kernel at pid:", os.getpid())
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context = zmq.Context.instance()
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# Uncomment this to try closing the context.
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# atexit.register(context.term)
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self.shell_socket = context.socket(zmq.XREP)
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self.shell_port = self._bind_socket(self.shell_socket, self.shell_port)
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self.log.debug("shell XREP Channel on port: %i"%self.shell_port)
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self.iopub_socket = context.socket(zmq.PUB)
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self.iopub_port = self._bind_socket(self.iopub_socket, self.iopub_port)
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self.log.debug("iopub PUB Channel on port: %i"%self.iopub_port)
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self.stdin_socket = context.socket(zmq.XREQ)
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self.stdin_port = self._bind_socket(self.stdin_socket, self.stdin_port)
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self.log.debug("stdin XREQ Channel on port: %i"%self.stdin_port)
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self.heartbeat = Heartbeat(context, (self.ip, self.hb_port))
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self.hb_port = self.heartbeat.port
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self.log.debug("Heartbeat REP Channel on port: %i"%self.hb_port)
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# Helper to make it easier to connect to an existing kernel, until we have
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# single-port connection negotiation fully implemented.
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# set log-level to critical, to make sure it is output
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self.log.critical("To connect another client to this kernel, use:")
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self.log.critical("--existing --shell={0} --iopub={1} --stdin={2} --hb={3}".format(
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self.shell_port, self.iopub_port, self.stdin_port, self.hb_port))
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self.ports = dict(shell=self.shell_port, iopub=self.iopub_port,
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stdin=self.stdin_port, hb=self.hb_port)
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def init_session(self):
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"""create our session object"""
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self.session = Session(config=self.config, username=u'kernel')
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def init_blackhole(self):
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"""redirects stdout/stderr to devnull if necessary"""
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if self.no_stdout or self.no_stderr:
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blackhole = file(os.devnull, 'w')
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if self.no_stdout:
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sys.stdout = sys.__stdout__ = blackhole
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if self.no_stderr:
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sys.stderr = sys.__stderr__ = blackhole
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def init_io(self):
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"""Redirect input streams and set a display hook."""
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if self.outstream_class:
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outstream_factory = import_item(str(self.outstream_class))
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sys.stdout = outstream_factory(self.session, self.iopub_socket, u'stdout')
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sys.stderr = outstream_factory(self.session, self.iopub_socket, u'stderr')
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if self.displayhook_class:
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displayhook_factory = import_item(str(self.displayhook_class))
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sys.displayhook = displayhook_factory(self.session, self.iopub_socket)
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def init_kernel(self):
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"""Create the Kernel object itself"""
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kernel_factory = import_item(str(self.kernel_class))
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self.kernel = kernel_factory(config=self.config, session=self.session,
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shell_socket=self.shell_socket,
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iopub_socket=self.iopub_socket,
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stdin_socket=self.stdin_socket,
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log=self.log
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)
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self.kernel.record_ports(self.ports)
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def initialize(self, argv=None):
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super(KernelApp, self).initialize(argv)
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self.init_blackhole()
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self.init_session()
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self.init_poller()
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self.init_sockets()
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self.init_io()
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self.init_kernel()
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def start(self):
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self.heartbeat.start()
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if self.poller is not None:
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self.poller.start()
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try:
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self.kernel.start()
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except KeyboardInterrupt:
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pass
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